Дисертації: "Optimal design tool"

1

Jonsson, Robert. "Life cycle energy optimization as a tool to compare and evaluate the optimal design in the automotive industry." Thesis, KTH, Lättkonstruktioner, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-285759.

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Fiber reinforced plastics are composite materials that offer a lower weight, while still mechanically perform at least as good as conventional materials such as steel. This makes them attractive for the automotive industry since the implementation of them in e.g. a car frame would enable the manufacturers to sell a more fuel efficient vehicle to the customer. The manufacturing of composites is however more energy intense than for steel and the recycling capabilities are limited. This encourages the car designer to regard the product from a macro-perspective, spanning from the extraction of the resources needed to produce the material, to the phase where the product which the material constitutes is disposed. By analyzing such a macro-perspective, the life cycle energy of a product system can be estimated. Since the life cycle energy is correlated to the component design, an optimization problem can be established where the objective function to be minimized is the total life cycle energy. The component design can be expressed in terms of optimization design variables, yielding that the minimum energy is achieved by the optimal design. This methodology is called life cycle energy optimization (LCEO). The aim of this thesis is to apply this method and present a comparison between different materials and recycling strategies for a load carrying frame component provided by Volvo Cars. The materials studied are carbon fiber reinforced plastics (CFRP), glass fiber sheet moulding compound (GF-SMC) and conventional steel. A Python model consisting of five life cycle phases where each phase was described by a function was implemented. Each function uses the component geometry and material properties as an input and gives the energy of the phase as an output. By summing the outputted energies, the life cycle energy is obtained. The distribution of the results is visualized with bar plots. The results show that the least energy demanding option is to manufacture the component in GF-SMC and process the end-of-life product mechanically. If the fiber degradation is taken into account, the most efficient strategy is to manufacture the component in CFRP and recycle it using solvolysis. This thesis shows that the LCEO methodology can be used as a tool for designers to include the recyclability in an early phase of the product development. Future challenges concern the development of industrial recycling of fiber reinforced plastics where the fiber degradation is minimized.
Fiberförstärkta polymerplaster är kompositmaterial som erbjuder en lägre vikt än konventionella material som stål, samtidigt som de bibehåller den mekaniska prestandan. Detta gör dem intressanta för fordonsindustrin då nyttjandet av dem skulle möjliggöra tillverkare att sälja bränsleeffektivare bilar. Tillverkningen av sådana kompositer är dock mer energikrävande än den för stål och deras återvinningsmöjligheter är begränsade. Detta skapar för fordonsformgivaren ett incitament att beakta produkten i ett makroperspektiv som sträcker sig från utvinningen av naturresurserna för att skapa materialet, till slutskedet av produktens avsedda användning. Genom att bestämma hur den ackumulerade energin är fördelad i ett sådant makroperspektiv kan den total livscykelenergin beräknas. Eftersom livscykelenergin är kopplad till komponentens formgivning, kan ett optimeringsproblem med livscykelenergin som målfunktion att minimeras ställas upp. Komponentens formgivning kan uttryckas som optimeringsproblemets designvariabler. Den design som ger den lägsta livscykelenergin blir därmed den optimala formgivningen. Denna metod kallas livscykelenergioptimering (LCEO). Målet med detta examensarbete är att tillämpa denna metod på en lastbärande bilkomponent tillhandahållen av Volvo Cars och genomföra en jämförelseanalys mellan olika material samt återvinningsstrategier. Materialen som undersöks är kolfiberförstärkt härdplastkompist (CFRP), sheet moulding compound med glasfiber (GF-SMC) och konventionellt stål. Den Pythonimplementerade modellen består av fem livscykelfaser där varje fas uttrycks om en funktion med komponentgeomterin samt materialegenskaperna som indata och ger energiåtgången för fasen som utdata. Genom att summera energierna erhålls livscykelenergin och genom att presentera resultaten i ett stapeldiagram kan livscykelenergidistributionen visualiseras. Resultaten visar att det minst energikrävande alternativet är att tillverka komponenten i GF-SMC och återvinna produkten genom mekanisk bearbetning. Om hänsyn tas till fiberslitage blir den optimala lösningen att tillverka komponenten i CFRP och återvinna den genom solvolys. Detta arbete visar att LCEO- metoden, i ett tidigt skede, kan användas som ett verktyg av formgivare för att inkludera hur väl en produkt kan återvinnas. Framtida utmaningar består av att utveckla återvinningen av fiberförstärkta härdplaster industriellt, så att fiberslitaget minimeras.

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2

Hubert, Tanguy Fitzgerald. "Design and implementation of a software tool for day-ahead and real-time electricity grid optimal management at the residential level from a customer's perspective." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/41188.

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This thesis focuses on the design and implementation of a software tool able to achieve electricity grid optimal management in a dynamic pricing environment, at the residential level, and from a customer's perspective. The main drivers encouraging a development of energy management at the home level are analyzed, and a system architecture modeling power, thermodynamic and economic subsystems is proposed. The user behavior is also considered. A mathematical formulation of the related energy management optimization problem is proposed based on the linear programming theory. Several cases involving controllable and non-controllable domestic loads as well as renewable energy sources are presented and simulation scenarios illustrate the proposed optimization strategy in each case. The performance of the controller and the changes in energy use are analyzed, and ideas for possible future work are discussed.

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3

Harby, Donald. "Parametric and optimal design of modular machine tools." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/4871.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2007.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on February 13, 2008) Vita. Includes bibliographical references.

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4

Chang, Li-Chung 1969. "A computer simulation tool for the design and analysis of all optical networks." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/36510.

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5

Grahn, Kajsa. "A study of optical properties of various materials as a tool in the process for designing a luminaire." Thesis, KTH, Ljusdesign, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-297943.

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Overlooking the important role materials, in relation to light, have in interior design and architecture is not so uncommon. However, materials are not only important for understanding light in architecture, but also in product design since all objects within a space contribute to its visual character and spatial appearance. This study investigates differences in optical properties of a selection of materials often found in Scandinavian domestic environments. It also explores and discusses the main question of how, in the process of designing a luminaire, product and lighting designers could make use of the visual quality differences between the selected materials, and when put in a spatial context how their properties can be used as a tool to create different lighting scenarios. In order to answer the main question, the study applied a practical approach including a small scale and full-scale laboratory, in which the investigation was based on testing and experimenting with light and material and where qualitative and quantitative aspects were observed, measured, and consolidated.

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6

Mignard-Debise, Lois. "Tools for the paraxial optical design of light field imaging systems." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0009/document.

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L'imagerie plénoptique est souvent présentée comme une révolution par rapport à l'imagerie standard. En effet, elle apporte plus de contrôle à l'utilisateur sur l'image finale puisque les dimensions spatiales et angulaires du champ de lumière offrent la possibilité de changer le point de vue ou de refaire la mise au point après coup ainsi que de calculer la carte de profondeur de la scène. Cependant, cela complique le travail du concepteur optique du système pour deux raisons. La première est qu'il existe une multitude d'appareils de capture plénoptique différents, chacun avec sa propre spécificité. La deuxième est qu'il n'existe pas de modèle qui relie le design de la caméra à ses propriétés optiques d'acquisition et qui puisse guider le concepteur dans sa tâche. Cette thèse répond à ces observations en proposant un modèle optique du premier ordre pour représenter n'importe quel appareil d'acquisition plénoptique. Ce modèle abstrait une caméra plénoptique par un réseau équivalent de caméras virtuelles existant en espace objet et qui effectue un échantillonnage identique de la scène. Ce modèle est utilisé pour étudier et comparer plusieurs caméras plénoptiques ainsi qu'un microscope plénoptique monté en laboratoire, ce qui révèle des lignes directrices pour la conception de systèmes plénoptiques. Les simulations du modèle sont aussi validées par l'expérimentation avec une caméra et le microscope plénoptique
Light field imaging is often presented as a revolution of standard imaging. Indeed, it does bring more control to the user over the final image as the spatio-angular dimensions of the light field offer the possibility to change the viewpoint and refocus after the shot and compute the scene depth map.However, it complicates the work of the optical designer of the system for two reasons. The first is that there exist a multitude of different light field acquisition devices, each with its own specific design. The second is that there is no model that relates the camera design to its optical properties of acquisition and that would guide the designer in his task. This thesis addresses these observations by proposing a first-order optical model to represent any light field acquisition device. This model abstracts a light field camera as en equivalent array of virtual cameras that exists in object space and that performs the same sampling of the scene. The model is used to study and compare several light field cameras as well as a light field microscope setup which reveals guidelines for the conception of light field optical systems. The simulations of the model are also validated through experimentation with a light field camera and a light field microscope that was constructed in our laboratory

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7

VITA, ALESSIO. "Manufacturing of Polymer Nanocomposites by CRTM: Methods and Tools for the Optimal Process Design." Doctoral thesis, Università Politecnica delle Marche, 2019. http://hdl.handle.net/11566/263229.

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Il mercato dei materiali compositi è in rapida crescita, soprattutto a causa dell'interesse del settore automobilistico nell'utilizzo di materiali leggeri, come le fibre di carbonio, per aumentare il consumo di carburante delle auto ed aumentarne l’autonomia. Uno dei processi di produzione più promettenti è il CRTM in quanto consente di ottenere componenti ad alte prestazioni limitando i costi di investimento. Infatti, il processo richiede una bassa pressione per l'iniezione della resina liquida attraverso le fibre grazie a un gap presente sopra la preforma in fibra di carbonio che consente alla resina di raggiungere facilmente ogni parte dello stampo. Un altro aspetto degno di attenzione è la possibilità di utilizzare nanocariche disperse nella matrice per migliorare le proprietà dei laminati finiti. Queste proprietà comprendono il comportamento meccanico, termico, elettrico e di smorzamento. Metodi per la progettazione di stampi e attrezzature per il CRTM non sono presenti in letteratura. Anche la dispersione di nanocariche nella matrice utilizzata per il CRTM non è stata completamente affrontata nello stato dell'arte e sono ancora presenti alcune incertezze sulla processabilità e sulle proprietà di queste matrici nano-additivate. Gli obiettivi di ricerca potrebbero essere sintetizzati come lo sviluppo di metodi e strumenti per la progettazione di stampi e attrezzature ausiliarie per il CRTM se si utilizzano matrici nanocaricate. Inoltre, è stata analizzata la correlazione tra i parametri di processo e le prestazioni dei prodotti. Questo lavoro di ricerca rappresenterebbe un passo verso l'adozione del processo CRTM su scala industriale per la produzione di componenti CFRP ad alte prestazioni in modo economicamente vantaggioso. I metodi e gli strumenti proposti possono rappresentare il modo per aumentare l'adozione del processo CRTM basato su matrici nano-additivate nel mercato automobilistico. Al fine di verificare la fattibilità e l'affidabilità di tali strumenti sono stati condotti diversi casi di studio per convalidare i metodi di progettazione scelti. I sistemi sviluppati sono stati progettati tenendo conto dei tre vincoli fondamentali dell'ingegneria di processo: tempi di produzione, costi di produzione e prestazioni dei prodotti.
The market of composite materials is rapidly growing, especially due to the interest of the automotive sector in using lightweight materials, such as carbon fibres, to increase the fuel efficiency of the cars. One of the most promising manufacturing processes is the CRTM as it allows to obtain highperformance components containing investment costs. Indeed, the process requires low pressure for the injection of the liquid resin through the fiber thanks to a gap present over the carbon fiber preform that allows the resin to easily reach every part of the mold. Another aspect worth of attention is the possibility of using nanofillers in addition to the matrix in order to improve the properties of the finished laminates. These properties encompass the mechanical, the thermal, the electrical and the damping behaviour. The use of these nanofillers dispersed in the matrix is possible thanks to the low pressure involved in this process. Methods for the design of molds and ancillary equipment for this process are not present in the literature. Also the presence of nanofillers in the matrix used for the CRTM has not been fully addressed in the state of the art and some uncertainties about the processability and the properties of these nano-additivated matrices are still present. The research goals could be synthesized as the development of methods and tools for the design of molds and ancillary equipment for the CRTM if nanoadditivated matrices are used. Moreover, the correlation between process parameters and performances of the products has been analysed. This research work would represent a step towards the adoption of the CRTM process on an industrial scale for producing high performance CFRP components in a cost/time-effective way. The proposed methods and tools can represent the way to increase the adoption of CRTM process based on nano-additivated matrices in the automotive market. In order to verify the feasibility and the reliability of such tools, different case studies have been conducted with the aim of validate the chosen design methods. The developed systems have been designed taking into account the three fundamental constraints of the process engineering: manufacturing time, manufacturing costs and performances of the products.

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8

Smit, Willem Jacobus. "The optimal design of a planar Stewart platform for prescribed machining tasks." Diss., Pretoria : [s.n.], 2000. http://upetd.up.ac.za/thesis/available/etd-01122007-134416/.

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9

Crespel, Thomas. "Optical and software tools for the design of a new transparent 3D display." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0366.

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Nous vivons une époque exaltante où de nouveaux types d'écrans sont rendus possibles, et la communauté scientifique s'emploie à améliorer l'expérience utilisateur. Nous vivons notamment l'émergence d'écrans courbés, volumétriques, autostéréoscopiques, transparents ou même portés sur la tête, avec des capteurs et algorithmes de plus en plus complexes permettant des interactions toujours plus riches.Cette thèse vise à contribuer à la création de ces nouveaux types d'afficheurs. À travers trois projets concrets, nous associons l'optique et l'informatique pour répondre à des problématiques spécifiques, avec l'objectif final de créer un nouveau type d'écran 3D. Chacun de ces projets a mené au développement de prototypes basés sur l'utilisation de picoprojecteurs laser, de caméras, d'éléments optiques et de logiciels dédiés.Dans un premier projet, nous avons étudié les écrans sphériques : ceux-ci sont plus adaptés que les écrans classiques pour visualiser des données sphériques, cependant les solutions existantes sont onéreuses et difficiles à mettre en place. Nous proposons une méthode pour concevoir un écran sphérique tactile à moindre coût en utilisant seulement des optiques commerciales et peu onéreuses ainsi que des éléments créés par impression 3D, dans le but de rendre ces écrans plus accessibles et reproductibles. Notre solution utilise un picoprojecteur laser associé à un système optique permettant de projeter une image nette sur toute la sphère. L'aspect tactile est réalisé par suivi optique de doigts dans l'infrarouge et nous avons développé un logiciel permettant de gérer l'affichage et l'interaction. Nous compensons l'utilisation de matériel peu coûteux par des calibrations et des corrections logicielles.Nous avons ensuite largement étudié la technologie des guides "wedges" (en forme de "cale"), qui sont devenus des éléments essentiels du reste de la thèse. Les guides wedges ont été initialement développés pour des systèmes de projection plats, mais dans ce projet nous les utilisons dans un contexte d'acquisition. La problématique est la suivante : dans certaines configurations, une zone d'intérêt peut être difficile à imager avec une caméra standard à cause du manque d'espace en face de celle-ci. Nous proposons d'utiliser un guide wedge et un film prismatique afin de replier la distance nécessaire. Nous avons étudié et validé différentes applications dans le domaine spécifique de l'archéologie.Les compétences que nous avons développées au cours de ces deux projets nous ont permis d'imaginer et de concevoir un nouvel écran autostéréoscopique transparent. Un tel écran peut être vu comme une vitre permettant d'ajouter au monde réel des information 3D dépendantes du point de vue, et cela sans avoir besoin de porter de lunettes ou de casques. Le principe est d'utiliser un guide wedge avec des picoprojecteurs laser générant chacun un point de vue différent. Les points de vues sont répartis en face de l'écran par un élément optique holographique que nous avons spécialement conçu. Ce nouvel écran ouvre le champ à de nombreuses applications en réalité augmentée
We live exciting times where new types of displays are made possible, and current challenges focus on enhancing user experience. As examples, we witness the emergence of curved, volumetric, head-mounted, autostereoscopic, or transparent displays, among others, with more complex sensors and algorithms that enable sophisticated interactions.This thesis aims at contributing to the creation of such novel displays. In three concrete projects, we combine both optical and software tools to address specific applications with the ultimate goal of designing a three-dimensional display. Each of these projects led to the development of a working prototype based on the use of picoprojectors, cameras, optical elements, and custom software.In a first project, we investigated spherical displays: they are more suitable for visualizing spherical data than regular flat 2D displays, however, existing solutions are costly and difficult to build due to the requirement of tailored optics. We propose a low-cost multitouch spherical display that uses only off-the-shelf, low-cost, and 3D-printed elements to make it more accessible and reproducible. Our solution uses a focus-free projector and an optical system to cover a sphere from the inside, infrared finger tracking for multitouch interaction, and custom software to link both. We leverage the use of low-cost material by software calibrations and corrections.We then extensively studied wedge-shaped light guides, in which we see great potential and that became the center component of the rest of our work. Such light guides were initially devised for flat and compact projection-based displays but in this project we exploit them in a context of acquisition. We seek to image constrained locations that are not easily accessible with regular cameras due to the lack of space in front of the object of interest. Our idea is to fold the imaging distance into a wedge guide thanks to prismatic elements. With our prototype, we validated various applications in the archaeological field.The skills and expertise that we acquired during both projects allowed us to design a new transparent autostereoscopic display. Our solution overcomes some limitations of augmented reality displays allowing a user to see both a direct view of the real world as well as a stereoscopic and view-dependent augmentation without any wearable or tracking. The principle idea is to use a wedge light guide, a holographic optical element, and several projectors, each of them generating a different viewpoint. Our current prototype has five viewpoints, and more can be added. This new display has a wide range of potential applications in the augmented reality field

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10

Seo, Chung-Seok. "Physical Design of Optoelectronic System-on-a-Chip/Package Using Electrical and Optical Interconnects: CAD Tools and Algorithms." Diss., Available online, Georgia Institute of Technology, 2005, 2004. http://etd.gatech.edu/theses/available/etd-11102004-150844/.

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Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2005.
David E. Schimmel, Committee Member ; C.P. Wong, Committee Member ; John A. Buck, Committee Member ; Abhijit Chatterjee, Committee Chair ; Madhavan Swaminathan, Committee Member. Vita. Includes bibliographical references.

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11

Du, Plessis Lukas Johannes. "Design and optimum operation of a re-configurable planar Gough-Stewart machining platform." Thesis, Pretoria : [s.n.], 2001. http://upetd.up.ac.za/thesis/available/etd-10312005-140405/.

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12

Dahlstrand, Christian. "Ground and Excited State Aromaticity : Design Tools for π-Conjugated Functional Molecules and Materials". Doctoral thesis, Uppsala universitet, Fysikalisk-organisk kemi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-173115.

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The main focus of this thesis is on the aromaticity of the ground state and electronically excited states of π-conjugated molecules and polymers, as well as how aromaticity is connected to their properties. The electronic structures of polybenzenoid hydrocarbons (PBHs) were explored through density functional theory (DFT) calculations and the π-component of the electron localization function (ELFπ). The study revealed how the π-electronic structure is influenced by the fusion of double bonds or benzene rings to the PBHs. We also demonstrated that the π-electrons of benzene extend to accommodate as much aromaticity as possible when bond length distorted. The aromatic chameleon property displayed by fulvenes, isobenzofulvenes, fulvalenes, bis(fulvene)s, and polyfulvenes were investigated using DFT calculations. The tria-, penta-, and heptafulvenes were shown to possess ionization energies and electron affinities which can be tuned extensively by substitution, some of which even outperform TTF and TCNQ, the prototypical electron donor and acceptor, respectively. The singlet-triplet energy gap of pentafulvenes can be tuned extensively by substitution to the point that the triplet state is lower than the singlet state and thus becomes the ground state. The ELFπ of isobenzofulvene shows that the benzene ring in an electronically excited state can be more aromatic than the corresponding ring in the ground state. We have shown that the 6-ring of [5.6.7]quinarene is influenced by a Hückel aromatic resonance structure with 4n+2 π-electrons in the excited quintet state. The bis(fulvene)s which are composed of a donor type heptafulvene and an acceptor type pentafulvene, retain the basic donor-acceptor properties of the two fragments and could function as compact donor-acceptor dyads. A few of the designed polyfulvenes were found to have band gaps below 1 eV at the PBC-B3LYP/6-31G(d) level. Various 2,7-disubstituted fluorenones and dibenzofulvenes were synthesized and their excited state properties were investigated by absorption spectroscopy and time-dependent DFT calculations. It was found that the 1A → 1B transition of ππ* character can be tuned by substitution in the 2,7-positions. The 2,7-bis(N,N-dimethyl) derivatives of fluorenone and dibenzofulvene displayed low energy transitions at 2.18 and 1.61 eV, respectively, in toluene.

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13

Liang, Li. "Graphical Tools, Incorporating Cost and Optimizing Central Composite Designs for Split-Plot Response Surface Methodology Experiments." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/26768.

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In many industrial experiments, completely randomized designs (CRDs) are impractical due to restrictions on randomization, or the existence of one or more hard-to-change factors. Under these situations, split-plot experiments are more realistic. The two separate randomizations in split-plot experiments lead to different error structure from in CRDs, and hence this affects not only response modeling but also the choice of design. In this dissertation, two graphical tools, three-dimensional variance dispersion graphs (3-D VDGs) and fractions of design space (FDS) plots are adapted for split-plot designs (SPDs). They are used for examining and comparing different variations of central composite designs (CCDs) with standard, V- and G-optimal factorial levels. The graphical tools are shown to be informative for evaluating and developing strategies for improving the prediction performance of SPDs. The overall cost of a SPD involves two types of experiment units, and often each individual whole plot is more expensive than individual subplot and measurement. Therefore, considering only the total number of observations is likely not the best way to reflect the cost of split-plot experiments. In this dissertation, cost formulation involving the weighted sum of the number of whole plots and the total number of observations is discussed and the three cost adjusted optimality criteria are proposed. The effects of considering different cost scenarios on the choice of design are shown in two examples. Often in practice it is difficult for the experimenter to select only one aspect to find the optimal design. A realistic strategy is to select a design with good balance for multiple estimation and prediction criteria. Variations of the CCDs with the best cost-adjusted performance for estimation and prediction are studied for the combination of D-, G- and V-optimality criteria and each individual criterion.
Ph. D.

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14

Colafemina, João Paulo. "Manufatura de microelementos ópticos difrativos." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/18/18146/tde-15092011-172640/.

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Os elementos ópticos difrativos representam um mercado em franco crescimento, da ordem de bilhões de dólares. Seu uso ostensivo está nos microeletrônicos, sistemas de iluminação, telecomunicações, equipamentos de segurança e outros. Por isso, esta tese teve como objetivo realizar investigação pública profunda no assunto. Insertos de cobre eletrolítico foram usados por proporcionar excelente acabamento superficial quando usinados com ferramenta de diamante monocristalino obtendo valores de Ra = 10,2 nm, Rq = 13,56 e Rt = 363,06 µm e para o aço inoxidável polido os resultados foram de Ra = 7,02 nm, Rq = 9,05 nm e Rt = 225,19 nm. As réplicas foram construídas em PMMA - DH ECL P com transmitância da luz avaliada em aproximadamente 90% em todo o espectro visível e infravermelho. Foram produzidos sete tipos de microelementos ópticos difrativos, baseados na geometria de Fresnel e nos arranjos de microlentes esféricas. Foi necessário desenvolver o código computacional denominado LF2010 para auxiliar a construção do projeto das microlentes anesféricas de Fresnel e calcular sua modulação de fase. Quatro processos determinísticos na fabricação dos µEODs foram usados: torneamento de ultraprecisão com ferramenta de diamante, microforjamento, microfresamento e a combinação dos dois últimos. O método estocástico de polimento foi usado para gerar acabamento óptico e compará-lo ao torneamento com SPDT. As análises metrológicas qualitativas e dimensionais foram conduzidas com o uso do MEV e da perfilometria óptica. No torneamento de ultraprecisão com ferramenta de diamante foi comprovada a presença do fenômeno conhecido como \"stick slip\" nos degraus da zona de Fresnel, corrigidos alterando-se o projeto. Para os arranjos de empacotamento completo os valores da rugosidade foram mais elevados em função da interatividade das lentes adjacentes do conjunto com \'fi\' = 100%, chegando até mesmo a causar microfraturas na estrutura das microlentes. Após sucessivos processos de calibragem, foram manufaturadas as réplicas pelas técnicas de termomoldagem e moldagem por injeção. Os resultados de replicação das microlentes mostraram que a razão de aspecto e a relação superfície/volume influenciaram significativamente na fidelidade de replicação das microlentes, sendo constatado que as lentes de Fresnel com altura variável possuem maior volume em relação às de altura constante e, consequentemente, melhor fidelidade na replicação. Na termomoldagem, as variações nas dimensões das cristas foram de nanômetros e a fidelidade no processo foi de aproximadamente 100% para todas as zonas de Fresnel. Nesta técnica, porém, os tempos de ciclos são até 40 vezes maiores que os da moldagem por injeção. As investigações paraxiais de FTM para a microlente de Fresnel com altura variável convexa foram de 85,2 % para 25 lp/mm, 67,5% para 50 lp/mm e 71,2% para 75 lp/mm. A simulação por elementos finitos foi usada para auxiliar nos estudos conferindo a sensibilidade do método de cálculo numérico do simulador nas escalas macroscópicas e microscópicas. No final, investigado o desgaste da aresta de corte da ferramenta, verificou-se o desgaste de flanco e a formação da APC, constituída de partículas do cavaco de cobre com formação lamelar. Conclui-se que é possível reproduzir diversos tipos de µEODs com métodos de produção em massa da moldagem por injeção tomando-se cuidado com as variáveis do processo, geometria da peça e propriedades físicas e químicas do material a ser replicado.
Diffractive optical elements represent a fast growing market, in order of billions dollars. Its use is employed in microelectronics, illumination systems, telecommunications, security devices, and others. For this reason, this thesis aimed to make depth public research in the subject. Electrolytic copper inserts were used for providing excellent surface finish when machined with monocrystalline diamond tool getting values of Ra = 10,2 nm, Rq = 13,56 e Rt = 363,06 µm, for the polished stainless steel the results were Ra = 7,02 nm, Rq = 9,05 nm e Rt = 225,19 nm. The replicas were built in PMMA - DH ECL P with light transmittance approximately 90% for visible and infrared spectrum. Seven types of diffractive optical microelements were produced, based in Fresnel geometry and spherical microlens array. For this, it was necessary to develop the computer code called LF2010 to support the construction design of aspheric Fresnel microlenses and calculate its phase transformation function. Four deterministic manufacturing processes of µDOEs were used: ultraprecision diamond turning, microforging, micromilling and the combination of the two last. Stochastic method of polishing was used to obtain mirror surface roughness and compare to SPDT. The qualitative analysis and dimensional metrology were conducted using MEV and optical profiling system respectively. In ultraprecision diamond turning has proved the presence of the phenomenon known as stick slip on the steps of Fresnel zone that was corrected by changing the design. For complete packaging arrays the roughness values were higher due the interaction of adjacent lenses of set with \'fi\' = 100% have even cause microfractures in the structure of microlenses. After successive calibration procedures in the manufacture of copper inserts, replicas were fabricated by techniques of hot emboss and injection molding. The results of microlenses replication showed that the aspect ratio and surface/volume ratio affected the fidelity replication of microlenses, and had been noted that the Fresnel lenses with variable height have higher volume in relation to constant height and consequently better fidelity in replication. Hot emboss process show little variations in the dimensions of the crests, in order of few nanometers, resulting a fidelity approximately 100% for all zones of Fresnel, however the cycle\'s technique are up to 40 times higher than injection molding. The paraxial FTM analysis shows 85,2% for 25 lp/mm, 67,5% for 50 lp/mm and 71,2% for 75 lp/mm to convex Fresnel microlens with variable height. Finite element analysis was used to aid in the studies giving the sensitivity of numerical method adopted in terms of macroscale and microscale. In the end, the wear of edge cutting tool was investigated and found wear flank and formation of built up edge that was made up of chip particles of copper, witch were formed continuously with segmented structure lamellar. Hence, after numerous studies and analysis we can conclude that it is possible to construct µDOEs by means of mass production methods of injection molding taking care of process variables, part geometry and physical and chemical properties of material being replicated.

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15

Lamotte, Maxime. "Etude du signal optique des chambres à fission et évaluation de son exploitation pour un système de mesure neutronique d'un réacteur de génération IV Development and first use of an experimental device for fission-induced spectrometry applied to neutron flux monitoring SCENA: A simulation tool for radiation-induced gas scintillation Simulation of heavy-ion slowing-down tracks with the SCENA code Design and irradiation test of an innovative optical ionization chamber technology Pulse-reactor core monitoring with an innovative optical neutron detector." Thesis, Université Grenoble Alpes, 2021. http://www.theses.fr/2021GRALI023.

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Cette thèse de doctorat expose l'étude la luminescence induite dans des capteurs à gaz de type chambre à fission, afin d'évaluer son utilisation pour le suivi de puissance des réacteurs nucléaires de quatrième génération comme ASTRID.Le dépôt d'énergie dans un gaz par des ions lourds produits lors de fissions nucléaires dans une chambre à fission est d'ordinaire exploité pour sa capacité à produire des charges libres, qui peuvent être détectées avec des électrodes. Cette méthode, utilisée depuis le début de l'ère atomique, n'est pas sans inconvénients, et des axes d'amélioration ont été clairement identifiés.En estimant la production d'états excités du gaz d'une chambre à fission classique, on déduit que de la lumière peut être émise en son sein, et être détectée par un photo-détecteur. L'utilisation du signal optique plutôt qu'électrique apporte une robustesse accrue aux systèmes de mesures neutroniques, insensibles au bruit électromagnétique.L'étude spectroscopique d'un plasma d'origine nucléaire dans un dispositif analytique dimensionné et conçu par nos soins permet d'enregistrer des spectres de raies d'émission caractéristiques de la scintillation du gaz. L'analyse de ses raies permet d'affirmer la supériorité de la détection optique de neutrons, car la pression et la composition du gaz de remplissage peuvent alors être estimées en ligne.Parallèlement à nos activités expérimentales, un code de simulation de la dynamique de peuplement des niveaux des plasmas froids excités par ions-lourds est développé afin d'optimiser de futurs détecteurs basés sur ce principe. Les temps caractéristiques nécessaires à la génération d'états radiatifs et la position des excitations autour d'une trace d'ionisation ont été estimés.Plusieurs prototype de capteurs de neutrons fonctionnant uniquement sur un principe optique sont exploités dans des faisceaux de neutrons froids du réacteur Orphée afin de vérifier la preuve de concept d'un tel système de mesure neutronique. Des essais dans le réacteur Cabri permettent quant à eux de quantifier la limite de détection, la linéarité et la dynamique du système.Les très bons résultats apportés par ces trois volets valident la preuve de concept de la détection passive et en ligne de neutrons, capable d'auto-diagnostic, pour des applications exigeantes en milieu difficile
This PhD thesis details the study of luminescence produced in gaseous detectors as fission chambers, to evaluate its use in 4th generation nuclear reactor power monitoring, as ASTRID.Energy deposition in the gas, from heavy-ions produced during nuclear fission in a fission chamber is usually used for its charge generation ability, that can be detected with electrodes. Such method has been used since the beginning of atomic era present disadvantages, and necessary improvements have been assessed.By estimating fission chamber gas excited states production, one can deduce intrinsic light emission, and its detection by appropriate photo-detectors. Use of an optical signal against an electric one improves dependability of a neutron flux monitoring system, immune to electromagnetic noise.Spectroscopic studies of a nuclear plasma in a self-designed analytical device allows observation of typical gas scintillation emission lines. Analysis of emission lines reinforce optical detection attraction, as pressure and gas composition can be monitored online.Alongside our experiments, a simulation code dedicated to heavy-ions induced cold-plasma excited levels population has been produced to optimise future detectors relying on optical emission. Typical times encountered for excited states generation and their position around an ionization track have been estimated.Several neutron detector prototypes based on the sole gas scintillation principle have been assessed in cold neutron beam lines of the Orphée reactor, to validate a proof of concept for neutron monitoring. Experiments on the Cabri reactor allowed quantification of detection limit, linearity and dynamic range of our system.The positive outcomes provided by these 3 lines of work validate the proof of concept of passive, on-line, and self-diagnosed neutron detection with high dependability in harsh environments

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16

Li, Meng-Chen, and 李孟宸. "Optimal Tool Design and Tool Grinding Efficiency Analysis for Milling Engineering Plastics." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/27ct4y.

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Анотація:

碩士
國立虎尾科技大學
機械與電腦輔助工程系碩士班
104
Due to the prosperity of 3C technology, milling cutters, drills or reamers of the machine tools are essential to manufacturing industry in recent years. More and more people pay attention to the appearance, color and weight of 3C products, instead of the functions. Therefore, there are a variety of materials processed into smartphone shells and intelligent products, such as the engineering plastic, titanium, or aluminum. This study emphasizes how to improve the tool life and the surface quality of the machining workpieces. The end mills used in the experiments are the single-blade cutter and the milling workpieces are the polycarbonate plus siloxane that is the polymerization of engineering plastics. This thesis divides into two parts. The first part is the analysis of tool geometry optimization and the second part is tool grinding efficiency optimization. Both of them used the experimental configuration Taguchi method which is L9 (34) and L32 (21 x49). The most important geometry of end mills in the first part is the rake angle and the relief angle. The goal of the experiment is to increase tool life and reduce the flash of workpieces. The analysis of variance and multiple characteristics analysis showed that the main factors affecting tool wear is the relief angle and affecting the flash is the rake angle. The factors in the second part are the most important parameter when milling cutting tools. They are the surface speed of a wheel, feed, and grain size. The main target of the second experiment is to reduce processing time of tool grinding and improve the quality of tools, such as the surface roughness of flank of end mills and the flatness of cutting edges. We found the principal parameter is the grain size of the fluting wheel by the variance and multiple characteristics analysis when we discussed the flatness of the cutting edges. The flute is the last part of the entire machining procedure, we could pick a better grain size of the fluting wheel and improve the feed of the others procedures. Experiments showed that one could obtain the better grinding quality, and spend the less time for the grinding procedures.

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17

GUO, JIA-KAI, and 郭家愷. "Optimal Tool Geometry and Design for Milling Aluminum Alloy 7003." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/cwwn6y.

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碩士
國立虎尾科技大學
機械與電腦輔助工程系碩士班
106
Cutting tools are an indispensable tool for the manufacturing industry. In recent years, the development of mobile phones has enabled mobile phone housings to use a variety of materials, such as aluminum alloys, titanium alloys, and plastic materials. This paper mainly designs the tool geometry to improve the tool life and the workpiece surface quality when milling the Al7003. First, tool geometry optimization is performed using the taguchi L9(34) orthogonal array. The control factor is the “radial rake angle”, “radial relief angle”, “axial rake angle”, and “axial relief angle” of the end mill. The goal is to increase the tool life, reduce the blade wear and the surface roughness of the workpiece, and then through the Analysis of variance and results of multi-item analysis.the second part of the tool geometry optimization, using the taguchi L18(34) orthogonal array. Based on the first part of the experimental results through the Analysis of variance and Multi-item analysis, it was found that the main factor affecting the surface roughness of the workpiece is the “rake angle”, and the radial relief angle has little effect on the surface roughness. Therefore, the control factors are changed to “radial rake angle”, “margin”, “axialrRake angle” , and “axial relief angle”.

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18

Wu, Chun-Ching, and 吳俊慶. "The Study of Optimal Tool Geometry Design for Milling S45C." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/bb5u99.

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碩士
國立虎尾科技大學
機械與電腦輔助工程系碩士班
104
In recently years, the China manufacturing industry develops quickly and economics grows rapidly, so the domestic industry can’t surmount difficulties by old business model. Manufacturers have to transfer high efficiency and high precision production mode into the older mode by using high quality cutting tools. Therefore, the aim of this thesis was to design the tool geometry to improve cutting efficiency of tools. The material of workpiece was S45C, and the experimental target was cutting force which mainly affected the production efficiency. The Taguchi method was utilized for assigning different tool geometry and machining parameters due to it could save costs and time effectively. Consequently, the experimental control factors were all independent. An L18 (21x37) orthogonal array was applied to assign different levels of the control factors. We employed ANOVA and the grey relational analysis to obtain the optimal parameter combinations.

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19

Kao, Chan-Kai, and 高振凱. "The Study of Optimal Tool Design for Milling Tungsten Carbide." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/sd9e58.

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Анотація:

碩士
國立虎尾科技大學
機械與電腦輔助工程系碩士班
101
The domestic and foreign industry develops quickly owing to the recovery of the technology industry, rapid economic growth, and diversification of products. The requirements of the standard for products are also relatively increased. The high accuracy of cutting tools and milling processes are also extremely important. How to effectively improve the accuracy of machining is a critical issue. 　In this study, the experiment was divided into rough machining and finish machining, and the material of workpieces is tungsten carbide. The Taguchi method was utilized for assigning different tool geometry and machining parameters due to this approach could save the time and cost effectively. Furthermore, it could achieve high experimental efficiency to enhance the robustness of manufacturing processes. An L32 (21x49) orthogonal array was applied to the experiment and the variance was analyzed. We employed the gray relational analysis to obtain the optimal combination of factors. 　In order to improve the efficiency of rough machining, one could increase the radial rake angle and clearance angle, and reduce the axial rake angle and clearance angle of cutting tools by the experimental verification. The tool geometry had low effect on finish machining. However, one could decrease the milling speed and the depth of cut to obtain good surface roughness.

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20

Wu, Tsung-Lin, and 吳宗霖. "The Optimal Design of Drill for Drilling SKD61 Tool Steel." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/sc5a7g.

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碩士
國立虎尾科技大學
創意工程與精密科技研究所在職專班
101
Due to the rapid development of cutting technology in recent years, various types of sophisticated cutting tools are required in the market. In which the drilling tool is one of the most widely used by theindustrial sector. First, we used grey relational analysis of the drilling parameters on the SKD61 tool steel. Theselected major characteristics indexes for performance evaluationof processes is tool wear, and the corresponding drilling parameters are core, relief angle, rake angle, chisel edge angle, drill type, drill speed and feed rate.Additionally, therake angleis significant factor for drilling performancewith a contribution of 47.49%.The results of confirmation experiments reveal that Taguchi method can effectively acquire the optimal combination of drilling parameters. Hence, this confirms that the proposed approach in this study can be a useful tool to improve the drilling performance on SKD61 tool steel.

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21

Kuo, Keng-Tong, and 郭耿東. "Optimal Parameter Design of CNC Turning Tool Steel Using Taguchi Approach." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/89241069445632927394.

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Анотація:

碩士
國立高雄第一科技大學
機械與自動化工程所
91
Abstract The tool steel is widely applied to mold and die, it is a kind of hardly cutting materials. The turning is usually used to machine columnar shape mold parts. That is important to select parameter before machining process, and it will directly affect product quality after machining process, if we can finish parameter design work quickly and exactly that will not only reduce manufacture time but also improve product quality. The research use Taguchi method, take two different hardness tool steels (SKD11 and SKD61) to make Turning experiment with CNC lathe, then use precision measuring instruments to measure and record three quality characteristics (Section Area, Surface Roughness, and Roundness) results, apply parameter design with models of Section Area vs. Section Area Single Dynamic Quality Characteristic and Minimum Quality Loss Multiple Quality Characteristic, expect to rise the Geometric Accuracy of workpiece. Experimental results showed that Taguchi method provides a simple, systematic, and efficient methodology for the optimization of the turning parameters. Turning with the optimization of Section Area vs. Section Area Dynamic Quality Characteristic model, the variation range reduces to 37.87%, and the Surface Roughness of workpiece are much better than initial condition. The result of Minimum Quality Loss Multiple Quality Characteristic model will be widely used to signal and multiple quality characteristic turning process. For much useful, the study have written operating interface program with Visual Basic software for that, it is helpful to get the optimum turning condition quickly and exactly for different quality intended. Mold manufactures can refer above multiple quality characteristic model to establish computer parameter design database, the useful technical database will let the parameter design work become easily, quickly, and exactly. Furthermore effectively rise mold quality and reduce manufacture time in the same cost.

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22

Lin, Gee-Tin, and 林吉廷. "Research on Optimal Design of Tool Probe for Friction Stir Welding." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/67497965408648003311.

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Анотація:

碩士
大葉大學
機械工程研究所碩士班
95
Easily it will have problem between the tool probe of friction stir welding and welding parameter, leading to the affection, depending on the quality of tool life and friction stir welding nugget. The reason of this simulated experiment shows that this research is on optimal design of tool probe for friction stir welding. AZ61 Magnesium alloy and the AZ80 Magnesium are used as first priority of searching material in this experiment, which can let us get the thought of the tool probe design and the influence of friction stir welding on materials Observing the tool probe, which surface change, weight change, and adhesion force character are regarded as design considerations in search of the best design of tool probe and improving tool life is needed. In this experiment, basically there are cylindrical shape, taper shape, screw shape with different materials Besides it may have affection based on rotation speed, feed rate, tool tilt angle, and the parameter of Friction Stir Welding. Furthermore, it will have the differences compared with magnesium alloy. The comparison between friction stir welding and tradition weld has different viewpoints, even through there is obvious improvement after finishing welding process, still has some drawbacks. Moreover the reason why it will have this result depending on he hole in the organization of weld nugget and the post-weld heat treatment [PWHT].After this process, there will be material losses after stirring, which means experiment sample also has this issue. From this research, we find there is a big connection among stirring material loss, weld drawback, and mechanical character. In addition, and the material loss comes from the stuff stuck on the tool probe, sample Fur side spillage, and the Fur Weight Disappearance under the Friction Stir Welding process. In the whole Study, we can find out the best design decision is screw probe in stirring procedure。 Keywords: Friction Stir Welding, Tool, Magnesium alloy

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23

CHEN, YOU-WEI, and 陳佑維. "The Study of Optimal Tool Design for Milling 316 Stainless Steel." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/d4dk3a.

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Анотація:

碩士
國立虎尾科技大學
機械與電腦輔助工程系碩士班
106
Owing to the progress of technology industry, rapid economic growth and product diversification, recent years 3C electronics industry has sprung up all over the world and brings the flourishing of smart phone industry, "the End-Mill" which use to process phone case also become an absolutely necessary tool. The purpose of this study was to research how to choose suitable cutting tool with different material, extend the tool life, and ensure the surface quality after process. In the study the milling workpieces is the 316 stainless steel material. this study is used experimental configuration Taguchi method to improve cutting 316 stainless steel material, and the control factor for this experiment is that the end mill affects the important geometric angles: radial rake angle, radial relief angle, axial rake angle, and axial relief angle. The objects of the experiments were to increasethe tool life, reduce the flank wear of tools and burrs of workpieces. Because the Taguchi method can achieve the highest experimental efficiency with less time and cost, the control factors in the experiment are independent and have no interaction, so use the L9(34) and L18(21x37) orthogonal arrays to configure the factor level. arrays. Based on the results of the variance analysis, and then the gray correlation analysis and multi-objective multi-item analysis, were used to obtain the best factor combination of this experiment.

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24

Tzeng, Yu-Sheng, and 曾淯聖. "The Study of Optimal Tool Design for Milling Glass-reinforced Plastic." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/emgpxc.

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Анотація:

碩士
國立虎尾科技大學
機械與電腦輔助工程系碩士班
104
Cutting Tools are indispensable for manufacturing industry. In recent years, the rapid development of smartphones made manufacturers use various materials for housings, such as aluminum alloy, titanium alloy, or plastics. The aim of this thesis was to design the tool geometry and the grinding parameters to improve the tool life and surface roughness for milling the glass-reinforced plastic. At first, the L9(3^4 ) orthogonal array was utilized for optimizing the tool geometry, and the control factors were radial rake angle, radial relief angle, axial rake angle, and axial relief angle. The objects of the experiments were to increase the tool life, reduce the flank wear of tools and burrs of workpieces. ANOVA and the analysis of multiple quality characteristics found that the relief and radial rake angles affected the flank wear and burrs, respectively. The second part applied the L50(2^1×5^11) orthogonal array for the optimization of the grinding parameters. The goal in the experiments was to reduce the grinding time, improve the flank roughness and flatness of cutting edges. The grain size of fluting wheels affected the flatness of cutting edges by ANOVA and the analysis of multiple quality characteristics because the finished grinding of flutes was the last procedure. As long as end users chose the finest grain size of grinding wheels and accelerated the feed of unimportant procedures, this can achieve to improve the grinding quality and reduce the grinding time.

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25

Kuo, Nai-hung, and 郭乃宏. "Optimal Parameter Design of CNC Turning Tool Steel Using Taguchi Dynamic Method." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/40648614969330159117.

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Анотація:

碩士
國立高雄第一科技大學
機械與自動化工程所
91
For manufactures making mold and die, knowing the date of delivery and accurate size of the product can produce profits and create competition. However, there are many different characteristics of tool steels. The turning process will be impacted by chip obstacle and tool wear, causing the quality of the items to be unstable and have size mistakes. Our study uses the dynamic characteristic of the Taguchi method to develop a high dimensional accuracy for the CNC turning tool process, and a two-phase parameter design for the best manufacturing result. The optimization of creating high dimensional accuracy in the CNC turning tool process is designed dimension vs. dimension ideal in the function model. It''s choices in coolant, cutting speed, feed, death of cutting, tool material, chip breaker, nose radius, insert shape for control factors and be experimented by an L18 orthogonal array. The often used tool materials of SKD-11 and SKD-61 are the error factors in this process. The CNC turning process system uses four different diameters for the input signal. According to the result of the experiment, the most important of impact factors are the tool material and the feed. The optimization of turning process descreases the variation range to 45.6%. It shows that surface roughness in the workpiece are much better than in the initial situation. It is the best in terms of process item accuracies and improves roughness of the surface. It has proved that the mold and die manufacturing quality can be improved. The two-phase parameter design establishes the ideal functions for double signals, input volume removal vs. machining time and dimension vs. dimension. The first step of seeking machining time robust quality, and the second step of making changes in product size, will give the best size accuracy. According to the experiment result, the feed and cutting speed will impact the machining time. Also choosing a resistant variation referencing parameters, the assembling of resistant variation, and regressive the data of workpiece, can make increase the accuracy of the workpiece. It also can have the machining time robust and for size accuracy of workpiece.

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26

HUANG, ZHI-YAN, and 黃智彥. "The Study of Optimal Tool Geometry Design for Milling NAK80 Mold Steel." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/59t73p.

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Анотація:

碩士
國立虎尾科技大學
機械與電腦輔助工程系碩士班
107
In this highly competitive industry, how to make high-quality and high-precision workpieces and effectively reduce the cost of the processes were the focus of various manufacturers. The excellent tools not only can bring good processing quality but also can make the largest productivity in limited tool life. In this study, we used the mold steel that was manufactured from Daido Steel Co., Ltd. Its characteristics were good mirror polishing performance, excellent electrical discharge machining performance, good welding performance and directly for manufacturing molds without heat treatment. It mainly applies to make the molds of the plastic products. The experimental targets were less tool wear and lower surface roughness values. The experiments employed the L18 orthogonal array of Taguchi method to assign different independent factors of tool geometry angles and cutting parameters in this thesis. According to the results after cutting, using ANOVA and the gray correlation analysis combine the radial flank wear, the axial flank wear and the surface roughness to obtain the optimal combination of experimental factors. From the experimental results, the ANOVA and the gray correlation analysis show that the cutting conditions account for more than 50% of the overall contribution rate. It means that choosing cutting conditions is very important. The significant factor in the tool geometry is the radial relief angle.

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27

Zheng, Yao-Hung, and 鄭耀鴻. "The optimal design of micro End-mill for milling SKD61 tool steel." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/29av3q.

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Анотація:

碩士
國立虎尾科技大學
創意工程與精密科技研究所
97
In this study, the simulation analysis model for micro milling SKD61 mold steel has been developed by the finite element package software DEFORM. The process of chip formation can be understood by simulating. Orthogonal Arrays is used to experiments scheme of micro milling simulation. The influence of various parameters such as rake angles, relief angles, cutting speeds and feed per tooth have been investigated. The cutting force, tool maximum temperature, tool maximum temperature and tip distance, the contact length of tool and chip are the major performance indexes of micro milling process. This is the issue of multiple quality characteristics. Multiple quality characteristics into a single performance index by applying grey relation analysis, this is grey relation grade. The optimal processing parameters are evaluated by Taguchi parameter design method. The micro end-mill has been ground by tool grinding software on a 5-axis CNC tool grinder machine. Micro milling for SKD61 mold steel has been performed. In the finished analysis model, the results from the actual cutting experiment are used to confirm accuracy from the finite elements analysis and from the actual cutting experiment are the same.

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28

Cheng, Chin-Fao, and 鄭金火. "Optimal Design and Analysis of a Cutting Tool with a Scott-Russell Mechanism." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/27020737799356115341.

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Анотація:

碩士
國立高雄第一科技大學
機械與自動化工程所
92
In precision machining, the cutting tools with cantilever-type mechanism and piezoelectric actuator were used to actively suppress tool vibration. However, its main disadvantage is that the cutting insert would also move in the axial direction (the undesired one). To reduce or remove the undesired movement, this paper proposes a tool with the Scott-Russell (SR) mechanism, which would provide a straight linear motion. For the purpose of optimal tool design, the Taguchi method is used to minimize the motion of the cutting insert in the axial direction based on the finite element analysis, so the dominant design parameters and their corresponding optimal values are identified. Then, experiments are conducted to verify the motion of the optimal tool. In addition, the equation of motion of the SR tool is derived using Langrage equations to support the controller design.

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29

Hun, Chu-Yih, and 洪崇益. "Optimal tool design of the tunnel-type punching machine with multiple quality characteristics." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/37465392102295806543.

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Анотація:

碩士
龍華科技大學
工程技術研究所
98
Sheet metals of the galvanized steel or the cold-rolled steel are the materials that usually used to manufacture the components of ball bearing slides. The sheet metal need to form the designed cross-section by using the successive rolling process first, then the semi-finished part is cut into the desired length on the tunnel-type punching machine. Since the workpiece is not a plate, geometries of the cutting tool varying with the non-linear cross-section is necessary to obtain the expected cutting performance. In this paper, ,optimal tool design in cutting the components of ball bearing slides with considering the multiple performance characteristics by using the Taguchi method and grey relational analysis is reported. Three performance characteristics are chosen to evaluate the cutting effects while eight parameters of tool geometry are selected as the controlled factors. Experiments based on the appropriate orthogonal array are conducted first. The normalized experimental results of the performance characteristics are then introduced to calculate the coefficient and grades according to the grey relational analysis. The optimized process parameters that simultaneously lead to better results are then verified through confirmation experiment. The outcome from Taguchi method indicate the radius of the cutting edge is the most significant geometric parameter to the tool life and the burr of cut edge, and that to the width deviation on both sides of the workpiece is tangent angle. From the grey relational analysis showing, optimal process parameters obtain the improvement of 18% on tool life, of 18% on burr of cut edge and of 133% on the width deviation on both sides of the workpiece, respectively.

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30

Wu, Chao-Feng, and 吳昭鋒. "The optimal design of end-mill for high speed cutting SKD61 tool steel." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/ze8t74.

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Анотація:

碩士
國立虎尾科技大學
創意工程與精密科技研究所
97
In recent years, ours industries develop very rapidly, and cutting technology grows very well. Machining variety of mechanical parts needs high-precision, quality and promotion of production efficiency. Hence the cutting technology is with the trend of high-speed and high feed rate. By high-speed machining, reduction of manufacturing process time, enhancing machining accuracy and production cost-down can be achieved. Due to development of high-speed machining, cutting tool manufacturers use different cutting tool materials in different cutting conditions and materials to obtain maximum benefit. 　　In this study, finite element method is used to construct high-speed cutting mode basically, and then by commercial software DEFORM-2D to simulate the factors of maximum temperature of the cutting tool, the distance of the cutting tool tip and maximum temperature, and cutting force effected of cutting tool in different geometric angles and cutting conditions. By Taguchi method and Gray relational method the best results of simulation can be analyzed and designed. After the accomplishment of the best and the worst combination, using these two sets compare with the results of cutting tool steel SKD61 experiment. 　　Experimental results show that the best design combination of cutting time increased 5.71 and 4.95 minutes, the cutting length of the respective growth of 2.02 and 1.53m. Therefore, using finite element method to construct high-speed cutting mode is a cost-effective technology. This study is successful to design for tool steel SKD61, and identify the most suitable for high-speed machining tool steel SKD61 parameters

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31

WANG, JUN-CHENG, and 王均丞. "The Study of Optimal Tool Geometry Design of End Mill for Milling S45C." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/7mgqt2.

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32

Lee, Wei Hsing, and 李薇欣. "Optimal Design on the Frame Structure of a Laser Machining Tool Using Genetic Algorithm." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/324sar.

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Анотація:

碩士
國立臺北科技大學
機電整合研究所
101
The optimal design of the base frame of a laser machine tool is studied in this paper. A finite element software ANSYS was employed in the static and modal analyses while the genetic algorithm was applied in the search for the design with better dynamic rigidity. The iteration for searching improved design was controlled with the programming of MATLAB. In order to reduce the computational effort, the frame was modeled with both solid and Beam elements depending on the geometry complexity. A multipoint constraint (MPC) method was applied in the proper coupling between these two types of elements. The coupling method showed the static and dynamic results were within 3% error comparing with those from total solid modeling. After 20 iterations and 3 mating, an optimal design with 15% improvement in first 3 modes'' natural frequencies was obtained with nearly the same static stiffness , the optimized frame had its first natural frequency raised from 246.27Hz to 288.05Hz , In the meantime , the weight of the frame was reduced by 19.3% .

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33

Shiu, Chi-Bin, and 徐啟彬. "The Research of the Optimal Structure Design of a High Speed Spindle Machine Tool." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/30263101323204835089.

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Анотація:

碩士
明志科技大學
機電工程研究所
96
This paper contains two parts. The first part is to investigate the clip force and vibration properties of the holder of the auxiliary high-speed spindle in the machine tool. Using the finite element software ANSYS, the clip forces, contact stresses, von Mises stresses, natural frequencies and mode shapes are obtained for the holder design estimation. The advantages and disadvantages of the aluminum and steel holders are discussed. The second part of this paper is to obtain the optimal dimensions of the 5-axes CNC machine tool using finite element analyses and Taguchi method. The structural deformation, natural frequency and weight are used to estimate the machine tool performance. The rib thickness, rib interval and wall thickness are the experimental factors in the Taguchi method. The numerical result of the optimal design is compared with the original design. It is proved that the optimal design from the Taguchi method has good performance.

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34

Chen, Yan-Ting, and 陳彥廷. "Optimal Configuration Design and Development of a Design Guiding System for a Dual-Toggle-Type Micro Machine Tool." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/a2x3ym.

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Анотація:

碩士
中原大學
機械工程研究所
99
Due the manufacturing demand of miniature parts, Non-MENS micro manufacturing has become one of the important developing manufacturing technologies. A micro machine tool with characteristics of low cost and high performance plays an important role in the micro machining field. In this study, a new configuration design for the dual-toggle-type micro machine tools was proposed. The new design improves the drawbacks of the previous design made by our lab. After optimization process, the design provides the advantages of small floor space, long travel length, and small variations in feed resolution. Besides, to shorten the design time, this research also developed a design guiding system written in MATLAB. This system can guide a user to complete the design of the important component of a new dual-toggle-type machine tool based on the defined floor space or travel length. In addition, the volumetric error analysis function and the error sensitivity analysis function were also built in the system to provide users the reference for selection of optimal machining region or continuous design improvement of the machine.

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35

Sheng-JiangXie and 謝聖江. "A Study on Optimal Design and Experiment of a Hydrostatic Guideway on Rotary Machine Tool." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/j3ktz8.

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Анотація:

碩士
國立成功大學
機械工程學系
102
As technology and economic development, in order to meet the increasing needs , the manufacturing level should also be relatively increased. Machine tool industry keep a close relationship with the industry, the development of machine tools excellence, promote production efficiency and product performance of manufacturing precision in that machine tool industry has trained the most professional talent and the most intensive technology, machine tool industry promote the development of the country's external competitiveness effects can not be ignored, and therefore the machine tool industry is regarded as indicators of the level of national industrialization. Future direction is to develop the design of large-sized, high-capacity, high rigidity, high damping of hydrostatic rail. Therefore, to enhance the precision machine tool industry trend towards the optimal design of the rail to become a major focus. This research study seniors in our laboratory before traditional hydrostatic rail system oil chamber into the hole is likely to cause only a single maximum pressure concentrated in the oil chamber into the hole, rely mainly on conventional rail design experience to adjust the parameters of the situation. The re-use of the finite difference numerical method, HTGA/Gray method of optimizing design and computer simulation designed to get the best rail configuration, seeking a uniform distribution of hydrostatic pressure rail obtained with high load capacity, high rigidity, high damping capacity and high stability of the hydrostatic rail system, and through experimental way to verify feasibility and practicality of this system.

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36

OU, RUEI-RONG, and 歐瑞榮. "The Study of Optimal K-Land of Tool Geometry Design for Milling High Hardness Steel." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/a7222y.

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Анотація:

碩士
國立虎尾科技大學
機械與電腦輔助工程系碩士班在職專班
107
The development of tungsten carbide tools has been a period, for example the most common end mills, and its development has almost reached the limit. Fortunately, new materials such as carbon fiber and 7 series aluminum alloys have been developed. The end mills are designed for any kind of used. Dedicated to the geometry of special materials, the tool can also be continuously modified. However, if it is for some materials that have been used on the market for a period and common materials, such as 6 series aluminum alloys, S45C medium carbon steel, and SKD11 die steel, etc. For these materials to increase the tool life, we must be more microscopic to study a milling cutter. The purpose of this thesis is to improve the life of the K-land of an end mill for machining SKD11 heat-treated steel. In this study, the way to find the optimal geometric angles of the end mill was by using the Taguchi method. The control factors were the slotted overcutting distance, K-land size, axial rake angle, dish angle, axial relief angle, and axial relief size. The Taguchi orthogonal array L18(3^6) was assigned with these six factors, and then the tool wear analysis was performed to find the optimal factor combination with the S/N ratio. Experimental results show that the life of the K-land was improved by applying the optimal factor combination.

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37

Huang, Kuo-Fuo, and 黃國富. "A CAD Tool for Optimal Fixed-point VLSI Structure of a Floating- point Based Digital Filter Design." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/48915573216138601669.

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Анотація:

碩士
國立中央大學
電機工程學系
86
One of the major tasks of a system IC designer is to determine the VLSI architecture and assign wordlength for a given DSP design.However, there is still no known good CAD tools that can help thedesigners to determine these two design issues automatically.In this thesis, we develop a knowledge-based CAD tool to assistsystem IC designers with the fixed-point implementation of a prescribeddigital filter. The tool can analyze the finite-precision behaviorfor a given floating-point based filter design. Based onthe analytical results, the tool can suggest most suitablefilter structure, wordlength assignment, and scaling operation to realizethe filter. It will also estimate the hardware cost of theresulting VLSI architecture. Therefore, the designer can simply pick up themost cost-efficient VLSI implementation of the target filter without goingthrough tedious fixed-point analysis.

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38

Zhou, Zhong-Wei, and 周中偉. "Research on the Optimal Design of the Geometrical Features and the Tool Life of the Micro Fluteless Taps." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/15906916951717749102.

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Анотація:

碩士
國立臺灣科技大學
機械工程系
104
This research mainly focuses on three parts, namely, the improvement of the former developed automatic optical inspection (AOI) system of the micro fluteless taps, the design optimization of the geometric features of the fluteless taps, and the tool life investigation of the tapping for SUS304 stainless steel sheet. Regarding the improvement of the developed AOI system, the software modules for the efficient inspection of the pitch and the chamfer angle have been amended based on the same hardware architecture. Concerning the reduction of the manufacturing cost and the increase the tool life of the micro fluteless taps, the optimal design of the geometrical features of the micro fluteless taps has been carried out. This study focuses on two parameters design of the taps by Creo3.0 Pro/MECHANICA software, including the chamfer angle and the shovel depth, respectively. With regard to the tool life investigation of the tapping, this study aims to analyze the tool life of the micro fluteless taps in terms of the number of tapping holes and to find the optimal diameter of the leading hole. According to the experimental results for tapping the SUS304 stainless steel plate with the thickness of 1mm, the tool wear results have been determined. The plot of the number of holes versus tool wears including wear length vs. tapping number, wear width vs. tapping number, radial wear vs. tapping number, thrust force vs. tapping number, and torque vs. tapping number, have been obtained in this study. The research results regarding micro fluteless tapping are expected to be used as a helpful reference for the industry.

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39

Chiang, Zu-Shun, and 蔣若舜. "The Study of optimal structure design of toggle-type Micro machine tool and dynamic characteristics of Micro Milling." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/94644494222417122960.

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Анотація:

碩士
中原大學
機械工程研究所
95
To care deformations is the most important for designing a micro cutting of Computer Numerical Control (CNC). This paper made the machine by ANSYS includes: (1) Static analysis: To find out the deformations of each parts of CNC are below 100nm. (2) Modal analysis: To find out the natural frequency to avoid them, and can watch out some weak structures from the modal drawing. (3) Harmonic analysis: To research the results of the modal analysis, and to make sure the amplitudes at resonance. Finish to design the micro CNC, I have to investigate the adaptable parameters for cutting. This paper had calculated tool’s radius, spindle’s rotational speed, radial depth, and feed speed by the instantaneous cutting areas of the cutting forces model. To find out the instantaneous cutting areas by mathematica which can calculate the tangential, radial and axial component of cutting forces during cutting. To find out aluminum’s (Al 60601 T6) cutting conditions, like the adaptable feed speed and axial depth for cutting in the future.

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40

Cheng-YenWu and 吳承諺. "A Study on Optimal Design of a Hydrostatic Guideway by using HTGA/Gray method on Rotary machine tool." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/91835770975394885399.

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Анотація:

碩士
國立成功大學
機械工程學系碩博士班
101
The machine tool is the hub of industry in a country, the machine tool industry and the manufacturing affect eachother. manufacturing has make progress because the excellence in the development of the machine tool that cultivated the most professional people with the most intensive technical. Led to the development of the machine tool industry, the impact of the country's competitiveness can not be ignored, therefore the machine tool industry is regarded as indicators of the degree of industrialization of the country, Taiwan's machine tool industry with flexible manufacturing and adaptability, good at customized products and known of inexpensive price, get advantage of assembled quickly and gain parts easily. For the visibility in the international, enhancing the domestic of machine tool trend towards high-precision rail optimized design has become a major focus. This study will design a uniform distribution of pressure hydrostatic rails apply to small and medium-sized rotary machine tool, with fast convergence, the least parameter combination of multiple quality characteristics and the global search, HTGA/Gray method and finite difference numerical methods, then simulation to design the best rail configuration. Different from the traditional hydrostatic rail, the maximum pressure of the oil chamber focused on a single into the hole and back to the sump size the interval too big lead into the hole, make the oil cavity pressure uneven distribution of impact rail performance. Get to take this with a high load capacity, high rigidity, high damping capacity and high stability of hydrostatic rail system through experimental way to verify the feasibility and practicality of this system.

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41

Wang, Chi-Yuan, and 王祺元. "Optimal Structure Design and Accuracy Inspection Methods for a Double Spindles and Dual-Servo-Type Machine tool for Rim Manufacturing." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/90898389218799220744.

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Анотація:

碩士
中原大學
機械工程研究所
95
The development of tooling machines is oriented toward mass production and high precision. Taking car rim machining industry for example, while facing the increasing market demand, tooling manufacturers have devoted to develop new models for the demand of high productivity and high precision for the rims. Thus, double-spindles rim-machining machine has been developed. With smaller space needed, it could double the productivity, in order to meet the market demand. This study aimed to optimize the structural design of this new model, and used Finite Element Method along with ANSYS software to conduct modal analysis on the sub-structures of the machine, dynamic flexibility, and static rigidity analysis. Based on the analysis results, problems of insufficient rigidity, tendency to tilt forward cause of heavy double-spindles structure were re-designed and improved. To minimize the weight of machine, ribs were used to replace the solid structure to lower the weights of sub-structures. The total weight of the machine was reduced from 28.39 tons to 11.97 tons, with a significant decrease of 57.83%. Therefore, the feeding speed of machine is able to increase, and the costs on materials is decreased. This study conducted accuracy testing for the special machine configuration after the design, analyzed the error characteristics and causes of the tooling machine, and proposed error detecting methods. Method using telescope magnetic ball bar was proposed to detect the causes of 2-axes motion errors of the tooling machine. Finally, this study used master-slave control method to improve the synchronus error caused by dual servomotor system. It can effectively redused the synchronus errors of the dual servomotor system, that will cause the inaccurate machining and structure-damage of machine. Machining patterns were designed to identify the height difference of two spindles and contouring error of machine incorporated with using CMM.

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42

Qian, Yufeng. "Making optimal use of the Web as a learning tool : the development of an instructional design model for Web-based instruction /." Diss., 2004. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3127537.

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43

Brennan, Martin James. "Preliminary interplanetary trajectory design tools using ballistic and powered gravity assists." Thesis, 2015. http://hdl.handle.net/2152/31342.

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Анотація:

Preliminary interplanetary trajectory designs frequently use simplified two-body orbital mechanics and linked conics methodology to model the complex trajectories in multi-body systems. Incorporating gravity assists provides highly efficient interplanetary trajectories, enabling otherwise infeasible spacecraft missions. Future missions may employ powered gravity assists, using a propulsive maneuver during the flyby, improving the overall trajectory performance. This dissertation provides a complete description and analysis of a new interplanetary trajectory design tool known as TRACT (TRAjectory Configuration Tool). TRACT is capable of modeling complex interplanetary trajectories, including multiple ballistic and/or powered gravity assists, deep space maneuvers, parking orbits, and other common maneuvers. TRACT utilizes an adaptable architecture of modular boundary value problem (BVP) algorithms for all trajectory segments. A bi-level optimization scheme is employed to reduce the number of optimization variables, simplifying the user provided trajectory information. The standardized optimization parameter set allows for easy use of TRACT with a variety of optimization algorithms and mission constraints. The dissertation also details new research in powered gravity assists. A review of literature on optimal powered gravity assists is presented, where many optimal solutions found are infeasible for realistic spacecraft missions. The need was identified for a mission feasible optimal powered gravity assist algorithm using only a single impulsive maneuver. The solution space was analyzed and a complete characterization was developed for solution types of the optimal single-impulse powered gravity assist. Using newfound solution space characteristics, an efficient and reliable optimal single-impulse powered gravity assist BVP algorithm was formulated. The mission constraints were strictly enforced, such as maintaining the closest approach above a minimum radius and below a maximum radius. An extension of the optimal powered gravity assist research is the development of a gravity assist BVP algorithm that utilizes an asymptote ΔV correction maneuver to produce ballistic gravity assist trajectory solutions. The efficient algorithm is tested with real interplanetary mission trajectory parameters and successfully converges upon ballistic gravity assists with improved performance compared to traditional methods. A hybrid approach is also presented, using the asymptote maneuver algorithm together with traditional gravity assist constraints to reach ballistic trajectory solutions more reliably, while improving computational performance.

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44

Huang, Ching-Chih, and 黃慶智. "Optimal Design of a Machine Tool Hydraulic Energy Saving System Motor and Investigate the Effect of the Stator and Rotor Structure on Motor Performance." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/31879234579875211225.

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Анотація:

碩士
逢甲大學
電機工程所
99
A surface-mounted brushless permanent magnet motor (SPM) for machine tool hydraulic energy saving system is designed. First, the magnetic circuit design software is applied to design the prototype of motor. Then, electromagnetic characteristics of the motor are obtained by using the finite element method (FEM). Finally, Taguchi method coupled with the grey relation analysis and fuzzy inference is used to optimize of the torque ripple, the torque to volume of magnet ratio, and the efficiency of the motor. Results are presented to demonstrate the effective and feasible of this approach. Furthermore, five different configurations that included rotor skew, stator skew, two-segment rotor, two-segment stator and two-segment stator shoe structure are investigated to reduce cogging torque, torque ripple, and back-EMF harmonics due to tooth-slot effect.

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45

Lin, Ying-chih, and 林盈志. "Research on the Z-axis Design of a Meso-scale 3-axis Milling Machine and the Optimal Micro-milling Parameters for the Tool Steel SKD61." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/89845645777639205946.

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Анотація:

碩士
國立臺灣科技大學
機械工程系
97
The purpose of this study includes two parts, one is the Z-axis design of a meso-scale 3-axis milling machine, the other is the determination of the optimal micro-milling parameters using a high speed spindle for cutting the tool steel SKD61. Regarding the Z-axis design of a meso-scale 3-axis milling machine, it mainly includes a pagoda structure, the high speed air bearing spindle, two ultrasonic motors, a laser diffraction grating interferometer (LDGI), and a counter-balance system for the spindle. The optimal geometrical dimensions of the pagoda structure have been determined by the ANSYS software. The Taguchi’s experimental method has been applied to determine the optimal micro-milling parameters for the tool steel SKD61 using a micro-mill with the diameter of 0.5 mm. Based on the Taguchi’s L9 matrix experimental results and the analysis of variation (ANOVA), the optimal micro-milling parameters for milling the tool steel SKD61 were the combination of the stepover of 0.01 mm, the spindle speed of 60,000 rpm, the feed of 60 mm/min, and the depth of cut of 0.04 mm. The cutting forces measured by a micro-dynamometer were 0.278N, 0.327N, and 3.63N with respect to x-, y-, and z-axes, respectively, using the optimal micro-milling parameters. Appling the optimal micro-milling parameters to the surface finish of a lens model, the measured surface roughness of 0.06μm was obtainable.

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46

Liao, Hsin-Hsu, and 廖信旭. "Simple partial core group within the optical inspection tool design." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/dm6zm3.

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Анотація:

碩士
國立虎尾科技大學
光電與材料科技研究所
97
Over the years more and more optical products in Taiwan, the types of products are more and more, relative to the optical performance requirements than ever before, so in the overall production process to enhance a number of requirements, and in the production the greatest impact for the optical properties of the lens single group within the core side, the manufacturing group within the core of the good side if the overall product yield a considerable impact, so whether in the production process can be found in real-time changes in the core group within the side in order to enhance product yields, and further amendments to the error is eager to break through various vendors, but in today''s world of optical surface-related Partial core group within the detector are very expensive and bulky, but also to detect partial optical core group does not have to spend less time, so are only suitable for the determination of the design study, does not apply to be detected in non-performing real-time use of the production line. In this study, DSC (digital camera) DSLR (digital single-lens reflex cameras) is required for lens production line designed to meet the following conditions: (1) can be determined immediately (2) small size (3) cheap Able to achieve three goals down the premise of the optical design Simple partial core group determination, and to break the current plight of products and can provide the exact line of the actual demand.

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47

Yang, Ching-Cheng, and 楊清程. "Structural and Optimal Design Analysis of CNC Machine Tools." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/98749750951609998872.

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Анотація:

碩士
中原大學
機械工程研究所
89
Abstract This study is mainly to propose a scheme for optimal design of structure devices of CNC machine tools. With given design constrains, the design scheme consisting of mechanics analysis, modal analysis, and static/dynamic stiffness analysis, provides results that can give machine designer a dimension range for designed structure devices, from which machine will have the relative optimal size and static/dynamic stiffness. The scheme has been implemented to the design of transmission shaft, honeycomb structured column, and spindle head of a five-axis CNC machining center by varying the gear ration, spaces between gear and bearing, dimension of honeycomb, and acting location on the column of cutting forces etc. Results have shown that honeycomb structure can significantly improve the stiffness of machine structure with lighter weight. ANSYS software was employed in this study for the modal analysis and dynamic stiffness analysis. Keywords: machine tools, transmission shaft, honeycomb structure, spindle head, static/dynamic stiffness analysis

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48

Chien, Yu-Kai, and 簡于凱. "Optimal Design of Direct-Drive Motors for Electric Hand-Tools." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/33kqp4.

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Анотація:

碩士
國立臺灣科技大學
電機工程系
107
Currently, the volume of electric screwdrivers sold on the market is limited by the small size of motors that they need to be matched with. Besides, traditional electric screwdrivers would add speed reducers to increase the torque, but adding them may cause transmission efficiency problems. Thus, the screwdrivers must consider the conversion efficiency of the reducer. Considering that the electric screwdrivers will directly affect the users, especially the noise and the vibration impact generated by the power tool, which is more likely to make users feel uncomfortable during the operation. In some precise technology, it is necessary to reduce the vibration in the screw locking process. Consequently, this research intends to propose "optimal design of direct-drive motors for electric hand-tools". This thesis aims to explore the application of the finite element method in direct-drive motor design. The main model motor is built based on the double air gap structure. To reduce the vibration and the noise of the prototype, the rotor with skewed slots is applied to reduce the cogging torque more effectively. Finally, the new model is optimized by a multi-target field method trend design to reduce the magnetic flux density and back electromotive force harmonic content of the silicon steel sheet and maintain the output average torque above the target value, thus completing the direct drive motor design optimization. According to the analysis of the finite element software, Flux 2D and Flux Skew, the average electromagnetic torque of the innovative archetype is 1.0571 Nm, which is 16.6 times higher than the slotless motor, and the torque density is 4.793 kN-m/m3. Compared with the control group, it can be improved by 2.78 times. On the other hand, the torque ripple of the new archetype is 5.31% lower than the reference group, from 8.22% to 2.91%. Besides, the total EMF harmonic distortion of the pattern is 0.93% lower than the comparison of 1.40%.

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49

Yang, Shih-Chin, and 楊士進. "Optimal Design and Current Control Waveform of Torque Motor for Machine Tools." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/75867864633293596154.

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碩士
國立臺灣大學
機械工程學研究所
95
Machine tools are most important and fundamental in the industry, especially at present, where there are great concerns about energy shortage and human-centered technologies. Traditional machine tools indirectly driven by conventional motors do not always operate efficiently, due to their mass moment of inertia and complexly coupled mechanisms. Today, a new competitive environment is emerging and forcing the evolution of machine tools for increasing efficiency over a wide range of operation. A directly driven torque motor has become a promising solution to the next-generation multi-axis machine tool, for its flexibility and intelligence in mass production. This thesis introduces a systematic design and control procedure of torque motor for the next-generation machine tools that operate with high torque and low ripples. From the design perspective, the optimal design of motor geometry maximizes the output torque and efficiency; it also minimizes the cost under various constraints of size, materials and power sources. From the control perspective, an optimal current control waveform with an optimal shift angle in each phase is determined in order to increase more output torque. A prototype is fabricated, and the experimental results not only show that the motor meets all the performance requirements, but also prove the reliability of the proposed design procedure. The design and control technology of this novel torque motor has been transferred to a world-class prestigious machine tool company.

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50

Yang, Shih-Chin. "Optimal Design and Current Control Waveform of Torque Motor for Machine Tools." 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2407200723325400.

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Дисертації з теми "Optimal design tool"

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