Готові списки джерел за темами / Freeformer

Добірка наукової літератури з теми "Freeformer"

Автор: Grafiati
Опубліковано: 22 червня 2024

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями

Оберіть тип джерела:

Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Freeformer".

Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.

Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.

Зміст

  1. Статті в журналах
  2. Дисертації
  3. Книги
  4. Частини книг
  5. Тези доповідей конференцій
  6. Звіти організацій

Статті в журналах з теми "Freeformer":

1

Fateri, Miranda, João Falcão Carneiro, Constantin Schuler, João Bravo Pinto, Fernando Gomes de Almeida, Udo Grabmeier, Tobias Walcher, and Michael Salinas. "Impact of 3D Printing Technique and TPE Material on the Endurance of Pneumatic Linear Peristaltic Actuators." Micromachines 13, no. 3 (February 28, 2022): 392. http://dx.doi.org/10.3390/mi13030392.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
In this paper, additive manufacturing was used in order to produce hose prototypes for peristaltic linear pneumatic actuators. In order to optimise the endurance of the actuator, we 3D printed different thermoplastic polyurethane elastomers with different shore hardness levels using ARBURG Plastic Freeforming technology. Furthermore, effects of the hose geometries on the lifetime of the actuator were investigated. Experimental evidence showed that the lifetime of the actuator was dependent on the combination of the hose design and on the material used to manufacture the hose. Moreover, experimental tests showed that the use of the Aurburg-Freeformer 3D printing technology led to a much higher hose endurance than the one reported by using the fused layer manufacturing technique.
2

Ceskova, Martina, and Petr Lenfeld. "POLYMER CAVITY MADE BY FREEFORMER® 3D PRINTER: AN INFLUENCE ON INJECTION MOULDED PARTS." MM Science Journal 12, no. 2018 (December 12, 2018): 2710–14. http://dx.doi.org/10.17973/mmsj.2018_12_2018125.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Giacoppo, Giuliano A., Julia Hötzel, and Peter P. Pott. "Additively Manufactured Porous Filling Pneumatic Network Actuator." Actuators 12, no. 11 (November 7, 2023): 414. http://dx.doi.org/10.3390/act12110414.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
This research project investigated the additive manufacturing of pneumatic actuators based on the principle of droplet dosing using an Arburg Freeformer 300-3X 3D printer. The developed structure consists of a porous inner filling and a dense, airtight chamber. By selectively varying the filling densities of the porous inner filling, different membrane deflections of the actuator were achieved. By linking the actuators, a pneumatic network actuator was developed that could be used in endorobotics. To describe the membrane deflection of an additively manufactured pneumatic actuator, a mathematical model was developed that takes into account the influence of additive manufacturing and porous filling. Using a dedicated test rig, the predicted behavior of the pneumatic actuators was shown to be qualitatively consistent. In addition, a pneumatic network actuator (PneuNet) with a diameter of 17 mm and a height of 76 mm, consisting of nine chambers with different filling densities, could be bent through 82° under a pressure of 8 bar. Our study shows that the variation of filling densities during production leads to different membrane deflections. The mathematical model developed provides satisfactory predictions, although the influence of additive manufacturing needs to be determined experimentally. Post-processing is still a necessary step to realize the full bending potential of these actuators, although challenges regarding air-tightness remain. Future research approaches include studying the deflection behavior of the chambers in multiple directions, investigating alternative materials, and optimizing the printing process to improve mechanical properties and reliability.
4

Liu, Junfeng, Yuqian Zhao, Kexian Liu, Linfeng Wang, and Fei Li. "Compensation machining of freeform based on fast tool servo system." PLOS ONE 18, no. 3 (March 16, 2023): e0282752. http://dx.doi.org/10.1371/journal.pone.0282752.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
With the advantages of large field of view, low cost and simple structure, the freeform optical system has extensive requirements in space exploration and other fields. However, the current machining methods for freeform are difficult to meet the requirements of optical use. Based on a developed fast servo tool (FTS) device, this paper proposes an error compensation turning method for freeforms. Firstly, the Zernike polynomial fitting method is used to reconstruct the freeform surface shape error obtained from off-line measurement, and the offset compensation is used to correct the tool path. Then, the compensation processing physical system is built to simulate the off-line compensation processing of the workpiece to verify the feasibility of compensation processing. Finally, the turning compensation processing of convex freeform aluminum mirror is carried out, and the surface accuracy of the workpiece meets the requirements of visible band. The research results have important practical significance for realizing the fast response machining of free-form surface mirror.
5

Horii, T., M. Ishikawa, Soshu Kirihara, Yoshinari Miyamoto, and Nobu Yamanaka. "Development of Freeform Fabrication of Metals by Three Diminsional Micro-Welding." Solid State Phenomena 127 (September 2007): 189–94. http://dx.doi.org/10.4028/www.scientific.net/ssp.127.189.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
A newly developed freeform fabrication process named 3D Micro-Welding, which is a combined system of a micro-TIG welding and a layered manufacturing method, is demonstrated. Various refractory alloys such as Inconel, stainless steel, and Invar can be freeformed besides elemental metals like titanium. Small metal beads of ~1mm in diameter are formed by emitting micro arc to the top of a thin metal wire of 0.2mm diameter. A fused bead is welded to a metal substrate or previously formed beads. By continuing this process and building up beads layer by layer under the control of CAD/CAM system, 3D objects were produced. In this study, optimization of micro-welding parameters such as the waveform of pulsed arc current and electrode materials were investigated and simple 3D objects of Inconel 600, SUS 304, Invar 42 were formed. The interfaces between adjacent beads were joined well and no crack or pore existed in the formed objects. The density and Vickers hardness of Inconel 600 objects showed comparable values to the commercial Inconel alloy, however the yield strength and Young’s modulus was about 80% and 70% of that alloy, respectively.
6

Frank, Samson, Maria Reichenbächer, Michael Seiler, Thomas Arnold, and Jens Bliedtner. "Investigation on Subsurface Damage Patterns in Ultrashort Pulse Laser Machining of Glass using Optical Coherence Tomography." EPJ Web of Conferences 287 (2023): 05024. http://dx.doi.org/10.1051/epjconf/202328705024.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Ultrashort pulse (USP) laser ablation is gaining popularity as a novel manufacturing technique for brittle materials, enabling the creation of complex freeform shapes that are challenging to produce with conventional optics manufacturing techniques. Freeforms have revolutionized optics manufacturing by providing designers with increased degrees of freedom using non-rotational symmetric components. However, this evolution presents new challenges for manufacturing processes, calling for innovative solutions such as USP ablation. To ensure the industrial viability of areal USP laser machining, it is crucial to not only consider material removal rates but also surface quality and subsurface damage (SSD). Especially for optical applications, harsh quality requirements must be met. This study investigates the SSD patterns of fused silica (FS) and borosilicate glass N-BK7 (BK) processed under different laser wavelengths, beam geometries and processing parameters using high-resolution optical coherence tomography (OCT). It is shown that OCT as non-destructive and 3D evaluation method is well-suited for analysing USP processes. The discovered differences in defect morphology between FS and BK emphasize the importance of selecting appropriate processes and process parameters when working with different materials. Compared to previous studies, for the parameter sets analysed here using OCT, much higher defects depths of up to 441 µm were revealed.
7

Zhu, Z., B. Peng, J. Yuan, and X. Xu. "Design method of double freeform surface lens with diffuse reflection." Lighting Research & Technology 52, no. 2 (February 4, 2019): 247–56. http://dx.doi.org/10.1177/1477153519825875.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
The design method of a double freeform surface lens is being widely applied in non-imaging optical systems. In this paper, a diffuse reflection freeform surface is introduced into the design of a double freeform surface lens. Different from the universal double freeform surface lens, this double freeform surface lens is divided into a small-angle freeform surface and a large-angle diffuse reflection freeform surface. The small-angle freeform surface firstly limits and forms the lighting area. Then, the large-angle freeform surface is designed to improve the efficiency of lighting the area. And this front light diffuse reflection effectively avoids the influence of light source projection onto the lighting effects. Based on this design method, the double freeform surface lens is obtained. The results show that the efficiency of a circular lighting area reaches 81% and the uniformity of the irradiance distribution reaches 91%. And this design is also suitable for forming different shapes of lighting areas while maintaining a better lighting effect.
8

Wang, Xuchu, Qingshun Bai, Siyu Gao, Liang Zhao, and Kai Cheng. "A Toolpath Planning Method for Optical Freeform Surface Ultra-Precision Turning Based on NURBS Surface Curvature." Machines 11, no. 11 (November 9, 2023): 1017. http://dx.doi.org/10.3390/machines11111017.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
As the applications for freeform optical surfaces continue to grow, the need for high-precision machining methods is becoming more and more of a necessity. Different toolpath strategies for the ultra-high precision turning of freeform surfaces can have a significant impact on the quality of the machined surfaces. This paper presents a novel toolpath planning method for ultra-precision slow tool servo diamond turning based on the curvature of freeform surfaces. The method analyzes the differential geometric properties of freeform surfaces by reconstructing NURBS freeform surfaces. A mathematical model is constructed based on the parameters of different positions of the freeform surface, toolpath parameters, and tool residual height. Appropriate toolpath parameters can be calculated to generate the optical freeform ultra-precision slow tool servo diamond turning toolpath. Compared with the toolpaths generated by the traditional Archimedes spiral method, the ultra-precision slow tool servo diamond turning toolpath planning method proposed in this paper can generate more uniform toolpaths on the freeform surfaces and keep the residual tool height within a small range.
9

Kong, Lingbao, Yingao Ma, Mingjun Ren, Min Xu, and Chifai Cheung. "Generation and characterization of ultra-precision compound freeform surfaces." Science Progress 103, no. 1 (October 10, 2019): 003685041988011. http://dx.doi.org/10.1177/0036850419880112.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Compound freeform surfaces are widely used in bionic and optical applications. The manufacturing and measurement of such surfaces are challenging due to the complex geometry with multi-scale features in a high precision level with sub-micrometer form accuracy and nanometer surface finish. This article presents a study of ultra-precision machining and characterization of compound freeform surfaces. A hybrid machining process by combining slow slide servo and fast tool servo is proposed to machine compound freeform surfaces. The machining process for this hybrid tool servo is explained, and tool path generation is presented. Then, a normal template-based matching and characterization method is proposed to evaluate such compound freeform surfaces. Experimental studies are undertaken to machine a compound freeform surface using the proposed method based on a four-axis ultra-precision machine tool. The machined compound freeform surface is also measured and characterized by the proposed analysis and characterization method. The experimental results are presented, and the machining errors for compound freeform surfaces are also discussed.
10

Li, Hua, Suet To, Ling Bao Kong, Chi Fai Cheung, and Wing Bun Lee. "Inspection Technology for F-Theta Lens: Practices and Discussions." Key Engineering Materials 364-366 (December 2007): 1191–96. http://dx.doi.org/10.4028/www.scientific.net/kem.364-366.1191.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
This paper presents the inspection technology for a freeform surface component which is named F-theta lens. F-theta lens is widely used in laser scanners, printers, etc. Freeform characterization is one of the main approaches to verify the manufacturing precision of freeform surface. At present, there is still a lack of techniques for the characterization of freeform surfaces. This study aimed to explore some approaches to inspect freeform surfaces. Two types of measurement methods, namely contact and non-contact measurement methods, are employed to measure the F-theta lens surface. The pros and cons, the existing problems, different applications and areas for improvement of the two methods are discussed. A series of advanced measuring instruments are used in the measurement process. A brief description of measurement mechanisms of these instruments is also presented. As a whole, this paper contributes to the development of the precision measurement technology for optical freeform surfaces.
Більше джерел
Також вас можуть зацікавити розширені добірки на тему "Freeformer" для конкретних типів джерел:
Статті в журналах Дисертації Книги

Дисертації з теми "Freeformer":

1

Le, Boterff Julien. "Compréhension des phénomènes physico-chimiques impliqués dans la réalisation de pièces polyoléfines par fabrication additive." Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Lille Douai, 2019. http://www.theses.fr/2019MTLD0012.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Les procédés de fabrication additive (FA) permettent de répondre, aujourd’hui, à des problématiques industrielles majeures. Ces technologies offrent la possibilité de réaliser, pour un temps et un coup raisonnables, des pièces avec des géométriques complexes difficiles, voire impossibles, à réaliser avec des procédés traditionnaux. Parmi les différents procédés de FA, le procédé APF (Arburg Plastic Freeforming) permet la fabrication de pièces 3D à partir de granulés de polymères identiques à ceux employés en injection. Ces granulés peu onéreux constituent une matière première de choix puisque, théoriquement, n’importe quel thermoplastique peut être utilisé. La technologie Freeformer s’appuie sur deux unités d’injection qui permettent de fondre et de plastifier les granulés de polymère et ainsi d’alimenter la tête d’impression. L'unité de décharge dotée d’un système piézo-électrique d’ouverture/fermeture génère, en tête de buse, des gouttelettes de polymère fondu (jusqu'à 200 μm) déposées sur une plaque de fabrication spécifique au matériau employé. Ces gouttes sont déposées selon un fichier CAO défini en amont afin de constituer des pièces 3D, couche par couche, dans une chambre thermorégulée. Même si la réalisation de pièces à partir de matériaux standards (ABS, TPU, …) est relativement simple, il est nécessaire d’optimiser les paramètres de fabrication de l’APF pour obtenir des pièces de bonne qualité avec d’autres matériaux. De la même manière que dans le cas d’un procédé de transformation de matière polymère classique, le choix de grades appropriés et l’optimisation des paramètres de fabrication associés est nécessaire. Ainsi, les différents phénomènes physico-chimiques impliqués dans la réalisation d’une pièce doivent être étudiés pour la réalisation de pièces avec un polymère peu employé en FA : le polypropylène. Une approche classique d’optimisation des paramètres de fabrication consisterait en la réalisation d’une étude paramétrique faisant intervenir, par exemple, un plan d’expérience. Cette méthode chronophage et demandeuse en matière ne permet pas la compréhension fine du procédé et n’est finalement applicable qu’à un polymère donné. L’objectif de ces travaux, cofinancés par la région Hauts de France, est donc de comprendre les corrélations existantes entre les paramètres du procédé et les propriétés du polymère pour comprendre comment le procédé influence la matière
Additive Manufacturing (AM) concerns are growing the last years due to the capabilities brought by the technology. Indeed, the AM processes offer the possibility to simply and rapidly create 3D parts with specific geometries, difficult or impossible to obtain with conventional processes. A new technology called Freeformer supplied by ARBURG (Germany) allows to manufacture high quality 3D parts using standard-commercial pellets. Contrary to the standard FDM processes, feedstock materials are cheap and any thermoplastic polymer can be theoretically employed. The Freeformer technology is based on two injection molding units that enables to melt the standard pellets and to feed the printing head. The discharge unit featuring a pulsed nozzle closure generates small (down to 200 μm) molten polymer droplets to build, layer-by-layer, three-dimensional parts in a thermoregulated chamber. Even if 3D parts are easily fabricated by using standard materials (ABS, TPU, …), the process parameters have to be optimized before getting good-quality parts with all other polymers, which consumes times and materials. In the same way than for a conventional polymer processing technology the choice of appropriate grades and the optimization of the associated processing parameters are needed. Hence, the different phenomenon which occur during a part realisation have to be examined in the case of a non-standard material in AM: polypropylene (PP). To optimize the structure and the mechanical properties of the parts, a common approach is to practice a parametric study. This time-consuming approach is not always efficient. Thus, the aim of this work, cofounded by the Région Hauts de France, is to understand the correlations between materials properties and process parameters
2

Wheelwright, Brian. "Freeform Solar Concentrating Optics." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/577087.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Notwithstanding several years of robust growth, solar energy still only accounts for<1% of total electrical generation in the US. Before solar energy can substantially replace fossil fuels subsidy-free at utility scale, further cost reductions and efficiency improvements are needed in complete generating systems. Flat panel silicon PV modules are by far the most dominant solar technology today, but have little room for improvement in efficiency and are limited by balance of system costs. Concentrated PV (CPV) is an alternate approach with long-term potential for much higher efficiency in sunny climates. In CPV modules, large area optics collect and concentrate direct sunlight onto small multi-junction cells with>40% conversion efficiency. Concentrated Solar Power (CSP) uses mirrors to concentrate sunlight onto thermally absorbing receivers, which generate electricity with convention thermal cycles. In this dissertation, four new optical approaches to CPV and CSP with potential for lower cost are analyzed. Common to each approach is the use of large square glass reflectors, which have very low areal cost (~$35/m^2) and field-proven reliability in the CSP industry. Chapter 2 describes a freeform toroidal lens array used to intercept the low concentration line focus of a parabolic trough to produce multiple high concentration foci (>800X) for multi-junction cells. In Chapter 3, three embodiments of dish mirrors and freeform lenslet arrays are explored, including an off-axis system. In each case, a dish mirror illuminates a freeform lenslet array, which divides sunlight equally to a sparse matrix of multi-junction cells. The off-axis optical system achieves +/-0.45° acceptance angle and averages 1215X geometric concentration over 400 multi-junction cells. Chapter 4 proposes a new architecture for CSP central receivers that achieves extremely high collection efficiency (>70%) with unconventional heliostat field tracking. In Chapter 5, the design and preliminary testing of a spectrum-splitting hybrid PV/thermal generator is discussed. This system has the advantage of 'drop-in' capability in existing CSP trough plants and allows for thermal storage, an important mitigation to the intermittency of the solar resource.
3

Guo, Jing. "Freeform Rammed Earth Shell Construction." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1491312964445038.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Wang, Yu. "Efficient modeling methods for freeform objects /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?MECH%202006%20WANG.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Sachlos, Eleftheherios. "Tissue engineering with solid freeform fabrication." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418645.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Wedowski, Raphael David. "Dynamic inspection of specular freeform surfaces." Thesis, University of the West of England, Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.572902.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
This thesis provides a review of the state-of-the-art in vision systems and methodologies and an introduction of important surface attributes and representations. Then three novel methods for the dynamic inspection of specular freeform surfaces are presented. These comprise two novel machine vision systems as well as a novel high-speed, multi-scale line tracing algorithm. Both of the novel systems employ a reciprocal deflectometric arrangement. The reflection of a laser line from a surface is monitored on a translucent screen. Here, a complex curve, known as the 'specular signature', is formed that contains all the information on the surface. Methods for extracting and interpreting this information are presented and incorporated into the two vision systems. Prototype demonstrators were designed and assembled to verify the presented methodologies. Extensive experimental validations of all three contributions are shown and the results are compared to ground truth data. Statistical validations of the systems are also presented. Also, the optical and angular resolutions as well as the limitations and the allowable ranges of surface characteristics for both systems, were calculated and presented. It is shown that they are applicable to a range of surface geometries and roughnesses that is comparable to those of existing techniques. The first of the two novel systems is designed for the robust and qualitative detection, classification and localisation of surface defects. It was validated using various real defects on specular freeform surfaces. It is shown that any discontinuity on a surface will be detected and can be classified as long as one criterion regarding the smallest radius of concave curvature on the surface is fulfilled. It is known that this criterion will be fulfilled for a very wide range of common surfaces. The second proposed vision system serves the purpose of a complete, quantitative reconstruction and digitalisation of moving, specular freeform surfaces. While the first system only requires the information from the specular signature, the second system also uses traditional and highly inaccurate surface height data, gathered through laser triangulation. These two data sets, computed from the diffuse as well as the specular reflection, are fused together to generate highly accurate surface bump (gradient) maps. Through the reverse engineering of several real specular specimens and the comparison to ground truth, it is shown that the standard deviation of the error of the height map reaches micrometer levels while that of the angular accuracy reaches levels below one degree. As a third original contribution to knowledge, a novel, high speed, multi-scale line extraction algorithm was developed. Intended for the rapid extraction of the specular signature from the screen images, it combines the processing speed of crude edge detectors with the versatility and accuracy of complex differential geometrical line extractors. It is also multi- scale, with best match scale space being chosen fully automatically. By combining the formerly separated steps of line point detection and line point linkage, the new algorithm is able to increase the processing speed of existing line extractors by up to 50 times. The time requirement is of the same order of magnitude as for crude edge detection algorithms such as Canny. The novel algorithm can also be implemented without the need for any global thresholds as it defines itself a variable local threshold, thereby increasing the sensitivity drastically.
7

Fournier, Florian. "FREEFORM REFLECTOR DESIGN WITH EXTENDED SOURCES." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3146.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Reflector design stemmed from the need to shape the light emitted by candles or lamps. Over 2,000 years ago people realized that a mirror shaped as a parabola can concentrate light, and thus significantly boosts its intensity, to the point where objects can be set afire. Nowadays many applications require an accurate control of light, such as automotive headlights, streetlights, projection displays, and medical illuminators. In all cases light emitted from a light source can be shaped into a desired target distribution with a reflective surface. Design methods for systems with rotational and translational symmetry were devised in the 1930s. However, the freeform reflector shapes required to illuminate targets with no such symmetries proved to be much more challenging to design. Even when the source is assumed to be a point, the reflector shape is governed by a set of second-order partial non-linear differential equations that cannot be solved with standard numerical integration techniques. An iterative approach to solve the problem for a discrete target, known as the method of supporting ellipsoids, was recently proposed by Oliker. In this research we report several efficient implementations of the method of supporting ellipsoids, based on the point source approximation, and we propose new reflector design techniques that take into account the extent of the source. More specifically, this work has led to three major achievements. First, a thorough analysis of the method of supporting ellipsoids was performed that resulted in two alternative implementations of the algorithm, which enable a fast generation of freeform reflector shapes within the point source approximation. We tailored the algorithm in order to provide control over the parameters of interest to the designers, such as the reflector scale and geometry. Second, the shape generation algorithm was used to analyze how source flux can be mapped onto the target. We derived the condition under which a given source-target mapping can be achieved with a smooth continuous surface, referred as the integrability condition. We proposed a method to derive mappings that satisfy the integrability condition. We then use these mappings to quickly generate reflector shapes that create continuous target distributions as opposed to reflectors generated with the method of supporting ellipsoids that create discrete sets of points on the target. We also show how mappings that do not satisfy the integrability condition can be achieved by introducing step discontinuities in the reflector surface. Third, we investigated two methods to design reflectors with extended sources. The first method uses a compensation approach where the prescribed target distribution is adjusted iteratively. This method is effective for compact sources and systems with rotational or translational symmetry. The second method tiles the source images created by a reflector designed with the method of supporting ellipsoids and then blends the source images together using scattering in order to obtain a continuous target distribution. This latter method is effective for freeform reflectors and target distributions with no sharp variations. Finally, several case studies illustrate how these methods can be successfully applied to design reflectors for general illumination applications such as street lighting or luminaires. We show that the proposed design methods can ease the design of freeform reflectors and provide efficient, cost-effective solutions that avoid unnecessary energy consumption and light pollution.
Ph.D.
Optics and Photonics
Optics and Photonics
Optics PhD
8

Kim, David. "Freeform 3D interactions in everyday environments." Thesis, University of Newcastle upon Tyne, 2014. http://hdl.handle.net/10443/2575.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Personal computing is continuously moving away from traditional input using mouse and keyboard, as new input technologies emerge. Recently, natural user interfaces (NUI) have led to interactive systems that are inspired by our physical interactions in the real-world, and focus on enabling dexterous freehand input in 2D or 3D. Another recent trend is Augmented Reality (AR), which follows a similar goal to further reduce the gap between the real and the virtual, but predominately focuses on output, by overlaying virtual information onto a tracked real-world 3D scene. Whilst AR and NUI technologies have been developed for both immersive 3D output as well as seamless 3D input, these have mostly been looked at separately. NUI focuses on sensing the user and enabling new forms of input; AR traditionally focuses on capturing the environment around us and enabling new forms of output that are registered to the real world. The output of NUI systems is mainly presented on a 2D display, while the input technologies for AR experiences, such as data gloves and body-worn motion trackers are often uncomfortable and restricting when interacting in the real world. NUI and AR can be seen as very complimentary, and bringing these two fields together can lead to new user experiences that radically change the way we interact with our everyday environments. The aim of this thesis is to enable real-time, low latency, dexterous input and immersive output without heavily instrumenting the user. The main challenge is to retain and to meaningfully combine the positive qualities that are attributed to both NUI and AR systems. I review work in the intersecting research fields of AR and NUI, and explore freehand 3D interactions with varying degrees of expressiveness, directness and mobility in various physical settings. There a number of technical challenges that arise when designing a mixed NUI/AR system, which I will address is this work: What can we capture, and how? How do we represent the real in the virtual? And how do we physically couple input and output? This is achieved by designing new systems, algorithms, and user experiences that explore the combination of AR and NUI.
9

Dharmaraj, Karthick. "Automated freeform assembly of threaded fasteners." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/19624.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Over the past two decades, a major part of the manufacturing and assembly market has been driven by its customer requirements. Increasing customer demand for personalised products create the demand for smaller batch sizes, shorter production times, lower costs, and the flexibility to produce families of products - or different parts - with the same sets of equipment. Consequently, manufacturing companies have deployed various automation systems and production strategies to improve their resource efficiency and move towards right-first-time production. However, many of these automated systems, which are involved with robot-based, repeatable assembly automation, require component- specific fixtures for accurate positioning and extensive robot programming, to achieve flexibility in their production. Threaded fastening operations are widely used in assembly. In high-volume production, the fastening processes are commonly automated using jigs, fixtures, and semi-automated tools. This form of automation delivers reliable assembly results at the expense of flexibility and requires component variability to be adequately controlled. On the other hand, in low- volume, high- value manufacturing, fastening processes are typically carried out manually by skilled workers. This research is aimed at addressing the aforementioned issues by developing a freeform automated threaded fastener assembly system that uses 3D visual guidance. The proof-of-concept system developed focuses on picking up fasteners from clutter, identifying a hole feature in an imprecisely positioned target component and carry out torque-controlled fastening. This approach has achieved flexibility and adaptability without the use of dedicated fixtures and robot programming. This research also investigates and evaluates different 3D imaging technology to identify the suitable technology required for fastener assembly in a non-structured industrial environment. The proposed solution utilises the commercially available technologies to enhance the precision and speed of identification of components for assembly processes, thereby improving and validating the possibility of reliably implementing this solution for industrial applications. As a part of this research, a number of novel algorithms are developed to robustly identify assembly components located in a random environment by enhancing the existing methods and technologies within the domain of the fastening processes. A bolt identification algorithm was developed to identify bolts located in a random clutter by enhancing the existing surface-based matching algorithm. A novel hole feature identification algorithm was developed to detect threaded holes and identify its size and location in 3D. The developed bolt and feature identification algorithms are robust and has sub-millimetre accuracy required to perform successful fastener assembly in industrial conditions. In addition, the processing time required for these identification algorithms - to identify and localise bolts and hole features - is less than a second, thereby increasing the speed of fastener assembly.
10

Uthoff, Ross D., Rachel N. Ulanch, Kaitlyn E. Williams, Diaz Liliana Ruiz, Page King, and R. John Koshel. "Designing a freeform optic for oblique illumination." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/627186.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
The Functional Freeform Fitting (F4) method is utilized to design a freeform optic for oblique illumination of Mark Rothko's Green on Blue (1956). Shown are preliminary results from an iterative freeform design process; from problem definition and specification development to surface fit, ray tracing results, and optimization. This method is applicable to both point and extended sources of various geometries.
Більше джерел

Книги з теми "Freeformer":

1

Dickson, Jack. Freeform. Swaffham, England: Gay Men's Press, 1998.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Freeform, Northern, ed. Northern Freeform. Northern Freeform: North Shields, 1995.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Kim, Dae Wook. Astronomical Freeform Optics. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-57790-2.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Hoschek, Josef, ed. Freeform Tools in CAD Systems. Wiesbaden: Vieweg+Teubner Verlag, 1991. http://dx.doi.org/10.1007/978-3-322-86773-5.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Solid, Freeform Fabrication Symposium (8th 1997 Austin Texas). Solid Freeform Fabrication Proceedings, September 1997. Austin, TX: University of Texas at Austin, 1997.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Detlef, Kochan, ed. Solid freeform manufacturing: Advanced rapid prototyping. Amsterdam: Elsevier, 1993.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Solid Freeform Fabrication Symposium (6th 1995 Austin, Texas). Solid Freeform Fabrication Proceedings, September 1995. Edited by Marcus Harris L. Austin, Tex: University of Texas at Austin, 1995.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Wang, Kai, Sheng Liu, Xiaobing Luo, and Dan Wu. Freeform Optics for LED Packages and Applications. Singapore: John Wiley & Sons Singapore Pte. Ltd, 2017. http://dx.doi.org/10.1002/9781118750001.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Mapstone, Prudence. Freeform: Serendipitous design techniques for knitting & crochet. Brisbane, Australia: Prudence Mapstone, 2002.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
10

Josef, Hoschek, ed. Freeform tools in CAD systems: A comparison. Stuttgart: B.G. Teubner, 1991.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Більше джерел

Частини книг з теми "Freeformer":

1

Kaut, Franziska, Valentin Cepus, Wolfgang Grellmann, and Ralf Lach. "Struktur-Eigenschafts-Beziehungen additiv gefertigter thermo-plastischer Polymere am Beispiel der ARBURG-Freeformer-Technologie." In Rapid.Tech + FabCon 3.D – International Trade Show & Conference for Additive Manufacturing, 217–35. München, Germany: Carl Hanser Verlag GmbH & Co. KG, 2018. http://dx.doi.org/10.1007/978-3-446-45812-3_14.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Jiang, Xiangqian. "Freeform." In CIRP Encyclopedia of Production Engineering, 1–7. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-642-35950-7_16854-1.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Jiang, Xiangqian. "Freeform." In CIRP Encyclopedia of Production Engineering, 737–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-53120-4_16854.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Selznick, Barbara. "Freeform." In From Networks to Netflix, 219–28. New York : Routledge, 2018.: Routledge, 2018. http://dx.doi.org/10.4324/9781315658643-21.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Selznick, Barbara. "Freeform." In From Networks to Netflix, 121–32. 2nd ed. New York: Routledge, 2022. http://dx.doi.org/10.4324/9781003099499-14.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Miglio, Edie, Nicola Parolini, Anna Scotti, and Christian Vergara. "Curve Freeform." In UNITEXT, 151–75. Milano: Springer Milan, 2019. http://dx.doi.org/10.1007/978-88-470-3987-2_6.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Miglio, Edie, Nicola Parolini, Anna Scotti, and Christian Vergara. "Superfici Freeform." In UNITEXT, 177–87. Milano: Springer Milan, 2019. http://dx.doi.org/10.1007/978-88-470-3987-2_7.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Wang, Charlie C. L. Changling. "Geometry of Freeform Products." In Geometric Modeling and Reasoning of Human-Centered Freeform Products, 87–105. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-4360-4_3.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Jiang, Wen Da, Bill Tse, Roy Louie, and Frankie Chan. "Diamond Turning Freeform Optics." In Optics Design and Precision Manufacturing Technologies, 1–6. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-458-8.1.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
10

Rafferty, Anna N., and Thomas L. Griffiths. "Interpreting Freeform Equation Solving." In Lecture Notes in Computer Science, 387–97. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19773-9_39.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.

Тези доповідей конференцій з теми "Freeformer":

1

Kiontke, Sven. "Freeforms about to lift off - standardization of freeform optics." In Optical Fabrication and Testing. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/oft.2012.ow2d.1.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Xia, J., and Q. J. Ge. "On the Exact Representation of the Boundary Surfaces of the Swept Volume of a Cylinder Undergoing Rational Bézier and B-Spline Motions." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/dac-8607.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Abstract This paper develops methods for the exact analysis and representation of the swept volume of a circular cylinder undergoing rational Bézier and B-spline motions. Instead of following the traditional approach of analyzing the point trajectory of an object motion for swept volume analysis, this paper seeks to develop a new approach to swept volume analysis by studying the plane trajectory of a rational motion. It seeks to bring together recent work in swept volume analysis, plane representation of developable surfaces, as well as computer aided synthesis of freeform rational motions. The results have applications in design and approximation of freeforms surfaces as well as tool path planning for 5-axis machining of freeform surfaces.
3

Nelson, Jessica DeGroote, Nathan Smith, Mark Walters, Kate Medicus, Matt Brophy, and Mike Mandina. "The Freedom of Freeforms: Current Optics Manufacturing Methods Allow for Freeform Optical Designs." In Freeform Optics. Washington, D.C.: OSA, 2013. http://dx.doi.org/10.1364/freeform.2013.ft3b.3.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Cassarly, William J. "Assessing Freeform Illumination Surface Tolerances." In Freeform Optics. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/freeform.2015.ft4b.1.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Reshidko, Dmitry, and Jose M. Sasian. "A method for the design of unsymmetrical optical systems using freeform surfaces." In Freeform Optics. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/freeform.2017.jw1b.2.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Stone, Bryan D., and Joseph M. Howard. "Low-order Aberration Coefficients of Systems with Freeform Surfaces." In Freeform Optics. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/freeform.2017.jw1b.3.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Menke, Christoph. "Optical Design with Orthogonal Freeform Representatives." In Freeform Optics. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/freeform.2017.jw1b.4.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

ten Thije Boonkkamp, J. H. M., and W. L. IJzerman. "Illumination freeform design using Monge-Ampère equations." In Freeform Optics. Washington, D.C.: OSA, 2019. http://dx.doi.org/10.1364/freeform.2019.ft2b.1.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Burge, James. "Developments Related to Design, Fabrication, and Measurement of Freeform Optical Components." In Freeform Optics. Washington, D.C.: OSA, 2013. http://dx.doi.org/10.1364/freeform.2013.fw1b.1.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
10

Habib, K. "Determination of The Energy Efficiency of Polymer Electrolyte Membrane-Fuel Cell by Digital Shearography and Electrochemical Impedance Spectroscopy." In Freeform Optics. Washington, D.C.: OSA, 2013. http://dx.doi.org/10.1364/freeform.2013.jm3a.14.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.

Звіти організацій з теми "Freeformer":

1

Bourell, D. L., J. J. Beaman, and Jr. Solid Freeform Fabrication Proceedings. Fort Belvoir, VA: Defense Technical Information Center, August 2001. http://dx.doi.org/10.21236/ada400355.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Kumar, Ashok V. Electrophotographic Solid Freeform Fabrication. Fort Belvoir, VA: Defense Technical Information Center, August 1999. http://dx.doi.org/10.21236/ada367167.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Bourell, D. L., and Kristin L. Wood. Solid Freeform Fabrication Proceedings. Fort Belvoir, VA: Defense Technical Information Center, August 2003. http://dx.doi.org/10.21236/ada422996.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Stanley, James H. CT-Assisted Solid Freeform Fabrication. Fort Belvoir, VA: Defense Technical Information Center, August 1996. http://dx.doi.org/10.21236/ada324726.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Stanley, James H. CT-Assisted Solid Freeform Fabrication. Fort Belvoir, VA: Defense Technical Information Center, May 1997. http://dx.doi.org/10.21236/ada326274.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Stanley, James H. CT-Assisted Solid Freeform Manufacturing. Fort Belvoir, VA: Defense Technical Information Center, February 1995. http://dx.doi.org/10.21236/ada300084.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Bourell, David L., Joseph J. Beaman, Crawford Jr., Marcus Richard H., Barlow Harris L., and Joel W. Solid Freeform Fabrication Proceedings -1999. Fort Belvoir, VA: Defense Technical Information Center, August 1999. http://dx.doi.org/10.21236/ada377264.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Landwehr, Philipp, Paulius Cebatarauskas, Csaba Rosztoczy, Santeri Röpelinen, and Maddalena Zanrosso. Inverse Methods In Freeform Optics. Technische Universität Dresden, 2023. http://dx.doi.org/10.25368/2023.148.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Анотація:
Traditional methods in optical design like ray tracing suffer from slow convergence and are not constructive, i.e., each minimal perturbation of input parameters might lead to “chaotic” changes in the output. However, so-called inverse methods can be helpful in designing optical systems of reflectors and lenses. The equations in R2 become ordinary differential equations, while in R3 the equations become partial differential equations. These equations are then used to transform source distributions into target distributions, where the distributions are arbitrary, though assumed to be positive and integrable. In this project, we derive the governing equations and solve them numerically, for the systems presented by our instructor Martijn Anthonissen [Anthonissen et al. 2021]. Additionally, we show how point sources can be derived as a special case of a interval source with di- rected source interval, i.e., with each point in the source interval there is also an associated unit direction vector which could be derived from a system of two interval sources in R2. This way, it is shown that connecting source distributions with target distributions can be classified into two instead of three categories. The resulting description of point sources as a source along an interval with directed rays could potentially be extended to three dimensions, leading to interpretations of point sources as directed sources on convex or star-shaped sets.
9

Calvert, Paul. Smart Materials by Extrusion Solid Freeform Fabrication. Fort Belvoir, VA: Defense Technical Information Center, January 2000. http://dx.doi.org/10.21236/ada376056.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
10

Marcus, Harris L. Solid Freeform Fabrication from Gas Precursors Using Laser Processing. Fort Belvoir, VA: Defense Technical Information Center, January 2002. http://dx.doi.org/10.21236/ada403015.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.

До бібліографії