Дисертації з теми "Machine-tools Design and construction"
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1
Mwenda, H. M. "Design, construction and evaluation of a nutation-spin rotary forging press." Thesis, University of Nottingham, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371286.
Повний текст джерела
2
Al-Akayshee, Qasim Hamood. "Design, construction and operation of an A.C. side excited machine." Thesis, University of Bath, 1996. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337822.
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3
Kolinska, Anna. "Performance Evaluation Tools for Interconnection Network Design." PDXScholar, 1994. https://pdxscholar.library.pdx.edu/open_access_etds/4764.
Повний текст джерелаАнотація:
A methodology is proposed for designing performance optimized computer systems. The methodology uses software tools created for performance monitoring and evaluation of parallel programs, replacing actual hardware with a simulator modeling the hardware under development. We claim that a software environment can help hardware designers to make decisions on the architectural design level. A simulator executes real programs and provides access to performance monitors from user's code. The performance monitoring system collects data traces when running the simulator and the performance analysis module extracts performance data of interest, that are later displayed with visualization tools. Key features of our methodology are "plug and play" simulation and modeling hardware/software interaction during the process of hardware design. The ability to use different simulators gives the user flexibility to configure the system for the required functionality, accuracy and simulation performance. Evaluation of hardware performance based on results obtained by modeling hardware/software interaction is crucial for designing performance optimized computer systems. We have developed a software system, based on our design methodology, for performance evaluation of multicomputer interconnection networks. The system, called the Parsim Common Environment (PCE), consists of an instrumented network simulator that executes assembly language instructions, and performance analysis and visualization modules. Using PCE we have investigated a specific network design example. The system helped us spot performance problems, explain why they happened and find the ways to solve them. The obtained results agreed with observations presented in the literature, hence validating our design methodology and the correctness of the software performance evaluation system for hardware designs. Using software tools a designer can easily check different design options and evaluate the obtained performance results without the overhead of building expensive prototypes. With our system, data analysis that required 10 man-hours to complete manually took just a couple of seconds on a Sparc-4 workstation. Without experimentation with the simulator and the performance evaluation environment one might build an expensive hardware prototype, expecting improved performance, and then be disappointed with poorer results than expected. Our tools help designers spot and solve performance problems at early stages of the hardware design process.
4
Martins, Miguel António Batista Esteves. "Project and construction of a single point incremental forming machine." Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/7752.
Повний текст джерелаАнотація:
Mestrado em Engenharia MecânicaSingle Point Incremental Forming is a recent technology that is currently under development. Its applicability is diverse because it allows the attainment of functional parts in sheet metal without great costs. Due to this characteristic, areas such as biomechanics, rapid prototyping and products of customizable features make this process a target of interest. Unfortunately, the means of obtaining parts using single point incremental forming are limited. Usually, CNC machining centers are utilized but due to their cutting-type characteristics, the implementation of the Single Point Incremental Forming is limited and inefficient. Also, the market supply of dedicated machinery requires high investments, thus becoming an unattractive solution. A major obstacle to the application of this technique focuses on the superior time of forming especially when compared to conventional forming techniques. Another disadvantage of this process is the low dimensional accuracy, however, with the development of numerical studies and correction algorithms this problem tends to be minimized. This work aims to complete the project of a single point incremental forming machine that began in previous years. This project has the objective of overcoming the limitations of the current incremental forming machines, but not ignoring the economic factor. Also, this project aims to enlarge the horizons for future research and development of the process, not only improving the machine but also developing and understanding the forming mechanism and the consequent effects of improved material formability.
A estampagem incremental é um processo recente que está em desenvolvimento. A sua aplicabilidade é variada pois permite a obtenção de peças funcionais em chapa metálica sem grandes custos associados. Devido a esta característica, áreas como a biomecânica, prototipagem rápida e produtos de características personalizáveis fazem deste processo um alvo de interesse. Infelizmente, os meios de obtenção de peças usando estampagem incremental por ponto único são limitados. Normalmente faz-se uso de centros de maquinagem CNC adaptados, que devido às suas características próprias de corte por arranque de apara, tornam a aplicação da estampagem incremental limitada e ineficiente. Além disso, a oferta de mercado em maquinaria com características dedicadas ao uso de estampagem incremental requerem elevados investimentos, tornando-se assim uma solução pouco atractiva. Um dos principais obstáculos à aplicação desta técnica centra-se no tempo de conformação elevado, principalmente quando comparado com técnicas de estampagem convencionais. Outra desvantagem deste processo é a baixa precisão dimensional, que todavia com o avanço dos estudos numéricos e com o desenvolvimento de algoritmos de correcção tende a ser minimizado. Neste trabalho pretende-se concluir o projecto de uma máquina para realização de estampagem incremental por ponto único que teve início em anos anteriores. Este projecto tem por objectivo a obtenção de uma máquina que ultrapasse as limitações das máquinas actuais, mas não desconsiderando o factor económico. Além disso este projecto visa ampliar os horizontes para futuras pesquisas e desenvolvimento do processo, tanto na melhoria da máquina, mas também no desenvolvimento e na compreensão do mecanismo de deformação existente e aumento associado da formabilidade material.
5
Msomi, Velaphi. "Modelling and testing smart aileron servo tabs : developing simulation tools for smart materials." Thesis, Cape Peninsula University of Technology, 2015. http://hdl.handle.net/20.500.11838/2150.
Повний текст джерелаАнотація:
Thesis (DTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2015.This dissertation addresses the development and the testing of a simulation tool to be used to predict the behaviour of smart material/structures. Along with the development of the simulation tool, a new form of the model describing the behaviour of shape-memory alloy was developed and implemented. The proposed model was developed based on the existing cosine model, conventionally used in literature, but it uses hyperbolic tangent functions. The hyperbolic tangent function was chosen so as to allow the simulation of any range of temperatures. Experiments were performed to obtain the parameters to be used in the simulation and to validate the numerical results. Two different simulations were performed: a one dimensional FEA analysis with a two dimensional orientation (NiTi SMA wire simulation) and a three dimensional FEA analysis (NiTi SMA plate) [Msomi and Oliver, 2015]. Alongside the FEA analysis, two experiments were performed with the purpose of obtaining the material parameters to be used in FEA analysis and to compare the FEA results to the experimental results.
Airbus Company
6
Bibby, Lee. "Improving design management techniques in construction." Thesis, Loughborough University, 2003. https://dspace.lboro.ac.uk/2134/793.
Повний текст джерелаАнотація:
Recent years has seen a significant drive away from traditional procurement routes with contractors finding themselves with an increasing responsibility for control of design - a process they have had little experience in managing. They now have to adapt accordingly. The learning curve is steep, not least because many projects must now be delivered fast track while co-ordinating increasingly complex fabric and content of buildings without a platform of accepted good practice to manage the design process. This is a major factor preventing the UK construction industry from delivering projects on time, to budget and to the specified quality. There is a need to educate an increasing number of people in design management techniques to equip them to manage today's fast moving and demanding projects. However, many current design management tools are insufficiently developed for industry application. Therefore, to improve design management in the industry, current techniques must be modified to align them with the needs of the modern design manager. This research has developed and tested a training initiative aimed at improving design management practice within a major UK Design and Construct Contractor. It comprises a Design Management Handbook, Design Management Training, Team Support and Project Monitoring. The Design Management Handbook is the core of the training initiative. It addresses critical aspects of design management practice and provides design management tools. Training provides guidance to project teams on the tools and practices. In Team Support project teams are supported in the implementation of the new practices and tools to help embed new ways of working in company practice. Project Monitoring establishes the impact of the new practices on project performance to demonstrate that they are working and thus reinforce change. To establish the training initiative's effectiveness and key findings, the impact of the initiative on design management performance has been explored. The research has established which practices and tools were used, which were not, as well as an understanding the applicability and performance of each Handbook practice and tool. From this, barriers to implementing new design management tools in industry were identified and strategies developed in order to overcome such barriers.
7
Shartouny, Michael. "Design of assembly machine for fine-pitch surface mount components." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/18899.
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8
Kang, Seong Pal Mechanical & Manufacturing Engineering Faculty of Engineering UNSW. "Virtual human-machine interfaces and intelligent navigation of wheelchairs." Awarded by:University of New South Wales. School of Mechanical and Manufacturing Engineering, 2006. http://handle.unsw.edu.au/1959.4/24359.
Повний текст джерелаАнотація:
This thesis is concerned with the development of virtual Human-Machine Interfaces (HMI) and navigation method for wheelchair systems. For virtual HMI, hand gesture recognition is employed, and two different hand gesture recognition algorithms have been developed. One is based on the geometric properties of a hand shape, and the other algorithm is based on the curvature of a hand shape contour. In the hand gesture recognition algorithm using geometric properties of a hand shape, eight non-dimensional parameters are computed and identifies hand shapes by comparing the ranges of the parameters to the statistical range information. This algorithm is invariant at scale, but does not work properly if the forearm of a hand shape is cluttered. The curvature based hand gesture recognition algorithm recognizes hand gestures using a combination of hand shape contour geometry and a non-dimensional quantity derived using the curvatures of the hand shape contour. The algorithm produces a set of signatures of the contour and identifies each hand gesture by finding matched template signatures. This algorithm is not affected by the forearm of a hand shape, but the scaling procedure is required. The developed gesture recognition system is implemented on a wheelchair in two different modes of operations, namely, the manual mode and the map (autonomous) mode. In the manual mode, the user continuously interacts with the wheelchair and controls the speed and the steering using the position and the orientation of hand gestures. In the map mode, the user selects a desired destination by pointing with a hand gesture onto a known map, and then the wheelchair initiates autonomous navigation. For wheelchair navigation, a doorway recognition algorithm and an obstacle avoidance algorithm have been developed. The wheelchair is localised by finding the doorway template in the specified zone. If the doorway recognition algorithm does not detect the doorway, it navigates to find the doorway using the obstacle avoidance algorithm. The obstacle avoidance algorithm finds obstacle edge points using range data and decides a safe passage for wheelchair navigation to find the doorway. Results obtained by implementing the above mentioned algorithms are presented.
9
Sari, Pelin. "Preliminary Design And Construction Of A Prototype Canola Seed Oil Extraction Machine." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607357/index.pdf.
Повний текст джерелаАнотація:
Growing energy demand in the world force people to investigate alternative energy sources. Unlike coal or other fossil fuels, renewable energy sources are promising for the future. Especially, seed oils are effectively used as energy sources such as fuel for diesel engines. The scope of this study is to develop an oil extraction machine specific to canola seed.
In this study, seed oil extraction methods have been investigated and various alternatives for the extraction machine have been considered. For continuous operation, oil extraction with a screw press is evaluated as the most appropriate solution. Four different prototypes have been designed and manufactured. According to the results of testing of prototypes, they have been modified and gradually improved to increase oil extraction efficiency. The working principle of the selected screw press based on the rotation of a tapered screw shaft mounted inside a grooved vessel. The screw shaft is a single square-threaded power screw having an increasing root diameter from inlet to exit while the outside diameter of the screw shaft is 66 mm. Seeds are taken into the system at the point where the depth of the screw thread is maximum. Then they are pushed forward by the threads on the rotating screw shaft and pass through inside the vessel. So, the fed seeds are compressed as they move to the other side of the vessel. Recovered oil escapes from high pressure zone and drains back. The oil is drained out from the oil drainage holes that are machined on high pressure zone of the vessel. Besides, the cake is extruded at the end of the vessel and the screw shaft. The cake thickness is adjustable by the axial movement of the screw shaft. By adjusting the cake thickness, different pressures can be obtained.
During the experiments, it is observed that four main features affect the oil recovery rate. These are the geometry of the grooves inside the vessel, the taper angle of the screw shaft, the operating temperature and the rotational speed. With the final prototype, an oil recovery efficiency of 62.5% has been achieved at 40 rpm with 15 kg/h seed capacity. Since the oil content of the seed is taken as 40%, oil recovery rate of the developed oil extraction machine is 3.75 kg/h. This efficiency is determined for a 0.8 mm cake thickness at 1.1 kW motor ower.
10
Thomason, Graham G. "The design and construction of a state machine system that handles nondeterminism." Thesis, University of Surrey, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412050.
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11
Ulmer, Bernard C. Jr. "Fabrication and calibration of an open architecture diamond turning machine." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/17120.
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12
Edwards, Kevin D. "Design, construction and testing of a wheelchair-mounted robotic arm." [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001276.
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13
Tognetti, Lawrence Joseph. "Actuator design for a haptic display." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/16926.
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14
Al-Sharif, Rakan. "Design and construction of a novel reconfigurable micro manufacturing cell." Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/6402.
Повний текст джерелаАнотація:
Demands for producing small components are increasing. Such components are usually produced using large-size conventional machining tools. This results in the inadequate usage of resources, including energy, space and time. In the 1990s, the concept of a microfactory was introduced in order to achieve better usage of these resources by scaling down the size of the machine tool itself. Several industries can benefit from implementing such a concept, such as the medical, automotive and electronics industries. A novel architecture for a reconfigurable micro-manufacturing cell (RMC) is presented in this research, aiming at delivering certain manufacturing strategies such as point of use (POU) and cellular manufacturing (CM) as well as several capabilities, including modularity, reconfigurability, mobility and upgradability. Unlike conventional machine tools, the proposed design is capable of providing several machining processes within a small footprint (500 mm2), yet processing parts within a volume up to 100 mm3. In addition, it delivers a rapid structure and process reconfiguration while achieving a micromachining level of accuracy. The approach followed in developing the system is highly iterative with several feedback loops. It was deemed necessary to adopt such an approach to ensure that not only was the design relevant, but also that it progresses the state-of-the-art and takes into account the many considerations in machine design. Following this approach, several design iterations have been developed before reaching a final design that is capable of delivering the required manufacturing qualities and operational performance. A prototype has been built based on the specifications of the selected design iteration, followed by providing a detailed material and components selection process and assembly method before running a performance assessment analysis of the prototype. At this stage, a correlation between the Finite Element Analysis (FEA) model and prototype has been considered, aiming at studying the level of performance of the RMC when optimising the design in the future. Then, based on the data collected during each stage of the design process, an optimisation process was suggested to improve the overall performance of the system, using computer aided design and modelling (CAD/CAM) tools to generate, analyse and optimise the design.
15
Sherry, Marion Mattis 1945. "AUTOMATED AND ROBOTIC TECHNIQUES FOR LABORATORY FLUID HANDLING IN MICROGRAVITY ON THE SPACE STATION (ISOELECTRIC FOCUSING, NASA, ELECTROPHORESIS, HUMAN/MACHINE INTERFACE, AUTOANALYZER)." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/276415.
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16
Aljundi, Liam. "Moving Mathematics : Exploring constructivist tools to enhance mathematics learning." Thesis, Malmö universitet, Institutionen för konst, kultur och kommunikation (K3), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-42981.
Повний текст джерелаАнотація:
The challenges faced by mathematics education reflect the more immense difficulties of the schooling system as a whole. This thesis investigates such challenges in the light of an ethical learning foundation and aims for a transformation through the use of technologies as learning tools. Interaction design methods are used to craft constructivist learning kits that aim to move mathematics students from passive receivers of knowledge to active learners. The proposed tools modify new technologies by adapting them to teachers’ and learners’ needs to be best suited for mathematics classroom adoption. Additionally, social, political, and economic issues that may hinder the adoption of constructivist learning are presented and critically discussed. Finally, this thesis paves the way for future designers who aim to design mathematics educational kits by providing a design framework based on the learning theory and the design process presented in this thesis.
17
Rehnberg, Adam. "Suspension design for off-road construction machines." Doctoral thesis, KTH, Fordonsdynamik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33883.
Повний текст джерелаАнотація:
Construction machines, also referred to as engineering vehicles or earth movers, are used in a variety of tasks related to infrastructure development and material handling. While modern construction machines represent a high level of sophistication in several areas, their suspension systems are generally rudimentary or even nonexistent. This leads to unacceptably high vibration levels for the operator, particularly when considering front loaders and dump trucks, which regularly traverse longer distances at reasonably high velocities. To meet future demands on operator comfort and high speed capacity, more refined wheel suspensions will have to be developed. The aim of this thesis is therefore to investigate which factors need to be considered in the fundamental design of suspension systems for wheeled construction machines. The ride dynamics of wheeled construction machines are affected by a number of particular properties specific to this type of vehicle. The pitch inertia is typically high in relation to the mass and wheelbase, which leads to pronounced pitching. The axle loads differ considerably between the loaded and the unloaded condition, necessitating ride height control, and hence the suspension properties may be altered as the vehicle is loaded. Furthermore, the low vertical stiffness of off-road tyres means that changes in the tyre properties will have a large impact on the dynamics of the suspended mass. The impact of these factors has been investigated using analytical models and parameters for a typical wheel loader. Multibody dynamic simulations have also been used to study the effects of suspended axles on the vehicle ride vibrations in more detail. The simulation model has also been compared to measurements performed on a prototype wheel loader with suspended axles. For reasons of manoeuvrability and robustness, many construction machines use articulated frame steering. The dynamic behaviour of articulated vehicles has therefore been examined here, focusing on lateral instabilities in the form of “snaking” and “folding”. A multibody dynamics model has been used to investigate how suspended axles influence the snaking stability of an articulated wheel loader. A remote-controlled, articulated test vehicle in model-scale has also been developed to enable safe and inexpensive practical experiments. The test vehicle is used to study the influence of several vehicle parameters on snaking stability, including suspension, drive configuration and mass distribution. Comparisons are also made with predictions using a simplified linear model. Off-road tyres represent a further complication of construction machine dynamics, since the tyres’ behaviour is typically highly nonlinear and difficult to evaluate in testing due to the size of the tyres. A rolling test rig for large tyres has here been evaluated, showing that the test rig is capable of producing useful data for validating tyre simulation models of varying complexity. The theoretical and experimental studies presented in this thesis contribute to the deeper understanding of a number of aspects of the dynamic behaviour of construction machines. This work therefore provides a basis for the continued development of wheel suspensions for such vehicles.QC 20110531
18
Tang, Nelson K. H. "The design and construction of a prototype yarn brushing machine to produce novel brushed yarns." Thesis, University of Huddersfield, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292286.
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19
Ariffin, Saparudin bin. "Modelling and simulation in support of the design and construction of modular machine control system." Thesis, Loughborough University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336507.
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20
Wichert, Torsten. "Design and Construction Modifications of Switched Reluctance Machines." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1235569858100-62518.
Повний текст джерелаАнотація:
Although the design principles of the Switched Reluctance Machines (SRMs) are available in different fragments in numerous bibliography positions, there no exists the complex design procedure of whole drive system taking into account the SR Machine, control system and supply device as well. The hybrid design method for SRM drives with application of new analytical calculation methods, finite element method and simulation models is proposed in this thesis. The calculation/design system is characterised by important effectivity and reliability. The new possibilities in analytical determination of saturation effects and core losses under various modes of control, including sensorless method, are also taken into account. The correctness of the proposed design algorithms are verified by laboratory tests made on three motor prototypes manufactured in industry for concrete application. This dissertation provides the elements indispensable for more accurate and complex analysis and design of drives with switch reluctance motors. The elements of electrical motor and control system design as well as the considerations on the choice of supply device and controller subsystems are jointed in the thesis for final receiving of the design tool for considered industrial drive system.
21
Umaschi, Bers Marina. "Identity construction environments : the design of computational tools for exploring a sense of self and moral values." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8708.
Повний текст джерелаАнотація:
Thesis (Ph. D.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2001.Includes bibliographical references (p. 204-212).
We live in a society where concepts of self, community and what is right and wrong are constantly changing. This makes it particularly challenging for young people to construct a sense of self and to identify and develop their most cherished personal and moral values. It also puts pressure on schools and society to help them do so. This thesis explores how new technologies can be used to create environments explicitly designed to help young people explore their inner worlds. I coined the term identity construction environments (ICE) to refer to computational tools purposefully designed with the goal of helping young people explore different aspects of the self, in particular personal and moral values. My contribution in this thesis involves three dimensions: theory, design and empirical research. At the theoretical level, I propose a framework through which people can think and learn about identity as a complex entity embracing multiple and contradictory values. At the design level, I describe an evolutionary process of building and investigating the use of three identity construction environments which are precursors to the one that is at the center of the empirical investigation described in this thesis.
(cont.) The three-dimensional multi-user environment I call Zora engages learners in the design of a graphical virtual city and its social organization. At the empirical level I present two studies of young people using Zora: a multicultural group of teenagers in an intensive summer workshop, and young patients in the Dialysis Unit at Boston Children's Hospital. Despite their diversity, both populations demonstrated a desire and need to explore issues of identity and values. The first study looks at how teens used Zora to express their sense of self, to create a participatory community to discuss ethical and moral issues, and to explore the relationship between personal identity and moral values. The second study focuses on how pediatric patients used Zora to escape the harshness of the dialysis treatment and to create a network to facilitate mutual support and new kinds of interactions with hospital staff. This thesis offers a theoretical framework and methodology for education in multicultural, moral and democratic values and for the potential role of computational environments in psychotherapeutic interventions.
Marina Umaschi Bers.
Ph.D.
22
Soto, Ogueta Carolina M. "User innovation in digital design and construction : dialectical relations between standard BIM tools and specific user requirements." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/72975.
Повний текст джерелаАнотація:
Thesis (S.M. in Architecture Studies)--Massachusetts Institute of Technology, Dept. of Architecture, 2012.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student submitted PDF version of thesis.
Includes bibliographical references (p. 144-147).
The use of Building Information Modeling (BIM) tools is increasing across the Architectural, Engineering and Construction (AEC) industry. This technology is being adopted in many different countries, in a wide range of types of projects, and by professionals from different disciplines. In other words, BIM tools are being applied in many different contexts of use. Consequently, the requirements of its users are becoming heterogeneous and this heterogeneity hinders the development of BIM tools that can satisfy all possible user requirements. Instead, tools are developed to satisfy more broad, general, and generic needs of the AEC industry. The present thesis examines how BIM users are adapting the standard tools to satisfy their specific requirements. Utilizing the user innovation theory as the framework of analysis, the thesis examines whether and how BIM users are adapting the tools to respond to their requirements through user innovation. Studying eight specific BIM user innovation cases, from different contexts of use, the thesis presents and analyzes the processes underlying BIM user innovation, from the starting motivation, to the final distribution of the actual innovation. This analysis has two main objectives: first, to recognize whether there is user innovation in the case of BIM tools; and second, to understand how that innovation is developed. Finally, the thesis extracts patterns of innovation, and examines whether these user innovation cases fit the model described by the user innovation theory.
by Carolina M. Soto Ogueta.
S.M.in Architecture Studies
23
Wichert, Torsten. "Design and Construction Modifications of Switched Reluctance Machines." Doctoral thesis, Technische Universität Warschau, 2008. https://slub.qucosa.de/id/qucosa%3A258.
Повний текст джерелаАнотація:
Although the design principles of the Switched Reluctance Machines (SRMs) are available in different fragments in numerous bibliography positions, there no exists the complex design procedure of whole drive system taking into account the SR Machine, control system and supply device as well. The hybrid design method for SRM drives with application of new analytical calculation methods, finite element method and simulation models is proposed in this thesis. The calculation/design system is characterised by important effectivity and reliability. The new possibilities in analytical determination of saturation effects and core losses under various modes of control, including sensorless method, are also taken into account. The correctness of the proposed design algorithms are verified by laboratory tests made on three motor prototypes manufactured in industry for concrete application. This dissertation provides the elements indispensable for more accurate and complex analysis and design of drives with switch reluctance motors. The elements of electrical motor and control system design as well as the considerations on the choice of supply device and controller subsystems are jointed in the thesis for final receiving of the design tool for considered industrial drive system.
24
Mdletshe, Zamavangeli. "Design and manufacturing of a temperature controlled chamber for a tensile testing machine." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2570.
Повний текст джерелаАнотація:
Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2017.Material testing is an important test to researchers in material science fields and other engineering related fields. This is the base for material evaluation prior to the application. This test is used in the engineering field to determine the strength of materials which is an aspect of assigning materials to different functions. The uniaxial tensile testing of material is the most common form of testing the strength of metallic material - usually to investigate whether or not the material is worthy of the intended application. Material testing is normally performed under uncontrolled conditions in most laboratories. Numerous attempts had been previously made in attempt to control the temperature conditions when performing the tensile test on special materials such as shape memory alloys (SMA) and other smart materials. Various methods had been employed to control the temperature during tensile testing, methods such as induction heating, warm liquid baths, etc. The aim of this study was to develop a temperature controlled environment for the Houndsfield tensile testing machine which is found at the Cape Peninsula University of Technology in the Mechanical Engineering Department workshop. This was achieved through designing and manufacturing of a thermally controlled chamber -better known as a furnace. This chamber was tested for the optimal combination of proportional, integral and derivative parameters which were tuned on the proportional integral derivative (PID) controller. Performing the tensile test under controlled thermal conditions will allow the analysis of SMAs and other materials behaviour at different temperatures. With the aid of the manufactured chamber, the superior features of the SMA will be able to be studied. The manufactured thermal chamber which is electrically powered is insulated with a special ceramic refractory material to prevent the heat from escaping the chamber. The PID controller was used to control the temperature and heating elements act as the heat source. The manufactured chamber could withstand the maximum temperature 350oC that it was initially designed for. However, the challenge of having the specimen to be tested fully inside the chamber was overcame by designing specimen connectors that connected the specimen to the tensile testing machine. Tensile tests were conducted on the SMA wire at room temperature and other various controlled temperatures and different behaviours were observed on the stress-strain graphs.
25
QURESHI, WAQAS. "Integrating Conductive Threads into Different Knitting Construction by Flat Knitting Machine to Create Stretch Sensitive Fabrics for Breathing Monitoring." Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-17449.
Повний текст джерелаАнотація:
During the last decade medical applications of textile sensors have been growing rapidly and textile sensors are the focal research point for many sensor projects. Textile sensors are still not available as a mainstream product to replace conventional electric sensors and electrodes. Textile sensors can be integrated in a textile garment to measure vital signs of a human being. In this regard stretch sensors are able to measure breathing rate of a person. In this project we use seamless knitting technique to make stretch sensors using conductive fibers. The resistance difference between stretching and relaxing of these sensors gives a pattern for human breathing. Four knitting structures with different conductive fibers are made and tested with cyclic tester to construct a graph between resistance and time to find the knitting structure which gives the best results. Tests are also done to check the results after washing. These sensors can be used in breathing monitoring of patients during daily life.Program: Master programme in Textile Technology
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Qureshi, Waqas. "Integrating Conductive Threads into Different Knitting Construction by Flat Knitting Machine to Create Stretch Sensitive Fabrics for Breathing Monitoring." Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-20938.
Повний текст джерелаАнотація:
During the last decade medical applications of textile sensors have been growing rapidly and textile sensors are the focal research point for many sensor projects. Textile sensors are still not available as a mainstream product to replace conventional electric sensors and electrodes. Textile sensors can be integrated in a textile garment to measure vital signs of a human being. In this regard stretch sensors are able to measure breathing rate of a person. In this project we use seamless knitting technique to make stretch sensors using conductive fibers. The resistance difference between stretching and relaxing of these sensors gives a pattern for human breathing. Four knitting structures with different conductive fibers are made and tested with cyclic tester to construct a graph between resistance and time to find the knitting structure which gives the best results. Tests are also done to check the results after washing. These sensors can be used in breathing monitoring of patients during daily life.Program: Master Programme in Textile Technology
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Goteti, Aniruddh. "Machine Learning Approach to the Design of Autonomous Construction Equipment applying Data-Driven Decision Support Tool." Thesis, Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-17635.
Повний текст джерелаАнотація:
Design engineers working in construction machinery industry face a lot of complexities and uncertainties while taking important decisions during the design of construction equipment. These complexities can be reduced by the implementation of a data-driven decision support tool, which can predict the behaviour of the machine in operational complexity and give some valuable insights to the design engineer. This data-driven decision support tool must be supported by a suitable machine algorithm. The focus of this thesis is to find a suitable machine algorithm, which can predict the behaviour of a machine and can later be involved in the development of such data-driven decision-support tools. In finding such a solution, evaluation of the regression performance of four supervised machine learning regression algorithms, namely SupportVector Machine Regression, Bayesian Ridge Regression, DecisionTree Regression and Random Forest Regression, is done. The evaluation was done on the data-sets personally observed/collected at the site which was extracted from the autonomous construction machine byProduct Development Research Lab (P.D.R.L). An experiment is chosen as a research methodology based on the quantitative format of the data set. The sensor data extracted from the autonomous machine in time series format, which in turn is converted to supervised data with the help of the sliding window method. The four chosen algorithms are then trained on the mentioned data-sets and are evaluated with certain performance metrics (MSE, RMSE, MAE, Training Time). Based on the rigorous data collection, experimentation and analysis, Bayesian Ridge Regressor is found to be the best compared with other algorithms in terms of all performance metrics and is chosen as the optimal algorithm to be used in the development of data-driven decision support tool meant for design engineers working in the construction industry.
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Raymond, Ian K. Mechanical & Manufacturing Engineering Faculty of Engineering UNSW. "Tools for the formation of optimised X-80 steel blast tolerant transverse bulkheads." Awarded by:University of New South Wales. School of Mechanical and Manufacturing Engineering, 2001. http://handle.unsw.edu.au/1959.4/20467.
Повний текст джерелаАнотація:
The Australian Maritime Engineering Cooperative Research Centre, and its partner organisation initiated this research effort. In particular, BHP and the Defence Science and Technology Organisation held the principal interest, as this research effort was a part of the investigation into the utilisation of X-80 steel in naval platforms. After some initial considerations, this research effort focussed on the development of X-80 steel blast tolerant transverse bulkheads. Unfortunately, due to the Australian Maritime Engineering Cooperative Research Centre not being re-funded after June 2000 and other project factors, the planned blast tests were not conducted, hence this research effort focussed on the tools needed for the formation of optimised blast tolerant transverse bulkheads rather than on the development of a single structural arrangement. Design criteria were formed from the worst case operational requirements for a transverse bulkhead, which would experience a 150 kg equivalent blast load at 8 m from the source. Since the development of any optimised blast tolerant structure had to be carried out using finite element analysis, material constants for X-80 steel under high strain rates were obtained. These material constants were implemented in the finite element analysis and the appropriate solid element size was evolved. The behaviour and effects of stress waves and high strain rates were considered and the literature reviewed, in particular consideration was given to joint structures and weld areas effects on the entire structural response to a blast load. Furthermore, to support the design criteria, rupture prediction and determination methodologies have been investigated and recommendations developed about their relevance. Since the response of transverse bulkheads is significantly affected by their joint and stiffener arrangements, separate investigations of these structures were undertaken. The outcomes of these investigations led to improvements in the blast tolerance behaviour of joints and stiffeners, which also improved the overall response of the transverse bulkhead to air blast loads. Finally, an optimisation procedure was developed that met all the design criteria and its relevant requirements. This optimisation procedure was implemented with the available data, to show the potential to develop optimised X-80 steel blast tolerant transverse bulkheads. Due to the constraints mentioned above the optimisation procedure was restricted, but did show progression towards more effective blast tolerant transverse bulkhead designs. Factors, such as double skin bulkheads, maximising plate separation, and the use of higher yield steel all showed to be beneficial in the development of optimal X-80 steel blast tolerant transverse bulkheads, when compared to the ANZACclass D-36 steel transverse bulkheads.
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Nourbakhsh, Mehdi. "Generalizable surrogate models for the improved early-stage exploration of structural design alternatives in building construction." Diss., Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/54942.
Повний текст джерелаАнотація:
The optimization of complex structures is extremely time consuming. To obtain their optimization results, researchers often wait for several hours and even days. Then, if they have to make a slight change in their input parameters, they must run their optimization problem again. This iterative process of defining a problem and finding a set of optimized solutions may take several days and sometimes several weeks. Therefore, to reduce optimization time, researchers have developed various approximation-based models that predict the results of time-consuming analysis. These simple analytical models, known as “meta- or surrogate models,” are based on data available from limited analysis runs. These “models of the model” seek to approximate computation-intensive functions within a considerably shorter time than expensive simulation codes that require significant computing power. One of the limitations of metamodels (or interchangeably surrogate models) developed for the structural approximation of trusses and space frames is lack of generalizability. Since such metamodels are exclusively designed for a specific structure, they can predict the performance of only the structures for which they are designed. For instance, if a metamodel is designed for a ten-bar truss, it cannot predict the analysis results of another ten-bar truss with different boundary conditions. In addition, they cannot be re-used if the topology of a structure changes (e.g., from a ten-bar truss to a 12-bar truss). If designers change the topology, they must generate new sample data and re-train their model. Therefore, the predictability of these exclusive models is limited. From a combination of the analysis of data from structures with various geometries, the objective of this study is to create, test, and validate generalizable metamodels that predict the results of finite element analysis. Developing these models requires two main steps: feature generation and model creation. In the first step, involving the use of 11 features for nodes and three for members, the physical representation of four types of domes, slabs, and walls were transformed into numerical values. Then, by randomly varying the cross-sectional area, the stress value of each member was recorded. In the second step, these feature vectors were used to create, test, and verify various metamodels in an examination of four hypotheses. The results of the hypotheses show that with generalizable metamodels, the analysis of data from various structures can be combined and used for predicting the performance of the members of structures or new structures within the same class of geometry. For instance, given the same radius for all domes, a metamodel generated from the analysis of data from a 700-, 980-, and 1,525-member dome can predict the structural performance of the members of these domes or a new dome with 250 members. In addition, the results show that generalizable metamodels are able to more closely predict the results of a finite element analysis than metamodels exclusively created for a specific structure.
A case study was selected to examine the application of generalizable metamodels for the early-stage exploration of structural design alternatives in a construction project. The results illustrates that the optimization with generalizable metamodels reduces the time and cost of the project, fostering more efficient planning and more rapid decision-making by architects, contractors, and engineers at the early stage of construction projects.
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Arendsee, Wayne C. "Development of a Coaxiality Indicator." Thesis, University of North Texas, 1999. https://digital.library.unt.edu/ark:/67531/metadc2283/.
Повний текст джерелаАнотація:
The geometric dimensioning and tolerancing concept of coaxiality is often required by design engineers for balance of rotating parts and precision mating parts. In current practice, it is difficult for manufacturers to measure coaxiality quickly and inexpensively. This study examines feasibility of a manually-operated, mechanical device combined with formulae to indicate coaxiality of a test specimen. The author designs, fabricates, and tests the system for measuring coaxiality of holes machined in a steel test piece.
Gage Repeatability and Reproducibility (gage R&R) and univariate analysis of variance is performed in accordance with Measurement System Analysis published by AIAG. Results indicate significant design flaws exist in the current configuration of the device; observed values vary greatly with operator technique. Suggestions for device improvements conclude the research.
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Wanigarathna, Nadeeshani. "Evidence-based design for healthcare buildings in England and Wales." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/16161.
Повний текст джерелаАнотація:
A substantial amount of credible evidence shows that properly designed healthcare built environments can positively impact upon the health outcomes of the building users. This offers an opportunity to improve the quality of healthcare through appropriately designed healthcare built environments. Evidence-based design (EBD) emerged within healthcare building design practice to enhance the process of designing with credible evidence. This research explored improvement opportunities for EBD in the UK which would subsequently improve the quality of healthcare through built environment interventions. Specifically, three key research gaps were addressed during this research. Firstly, this research explored current practices of evidence use during healthcare designing and opportunities to increase the direct use of research-based evidence and alternative ways of conveying research-based evidence into the design process through other source of generic evidence for design. Secondly, this research explored how evidence could be effectively expressed within healthcare design standards, guidance and tools (SGaTs) in the forms of performance and prescriptive specifications. Finally, considering the unique nature of built environment design, this research explored how project unique contextual circumstances impact EBD processes and how practitioners reflect on these circumstances. These challenges were then transformed into six objectives. Following a comprehensive literature review, this research was divided into four phases. First, a model of the sources and flows of evidence (SaFE) was developed to represent evidence for EBD within generic evidence for design. The initial conceptual model was developed through desk study, based on the literature review, self-experience and the experience. This model was then verified with the comments from five un-structured interviews conducted with lecturers and senior lecturers of the School of Civil and Building Engineering. Finally, the model was validated using 12 semi-structured interviews conducted with design practitioners from the industry. In addition to the validating the sources and flows of evidence these interviews revealed rationales behind design practitioners use of evidence from four types of evidence sources. These results revealed improvement opportunities to increase the intake of research-based evidence use during healthcare built environments designing. The main data collection method for this research was case studies. Eight exemplar design elements within three case studies were investigated to explore details of evidence use practices; practices of using performance and prescriptive specifications; and impact of project unique contextual circumstances for EBD process and how design practitioners reflect on these circumstances. Results of this research revealed that EBD needs to be supported by both externally published research evidence and through internally generated evidence. It was also identified that EBD could be significantly facilitated through research- evidence informed other generic design evidence sources. Healthcare design SGaTs provides a promising prospect to facilitate EBD. Performance specification driven healthcare design SGaTs supplemented by prescriptive specifications to define design outputs and design inputs could improve effective use of evidence-informed SGaTs. These results were incorporated into a framework to guide development of healthcare design SGaTs. Finally, by exploring how projects unique contextual circumstances impact EBD processes and how practitioners reflect on these circumstances, this research identified the need for procedural guidance for designers to guide evidence acquisition, evidence application and new evidence generation.
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Koslav, Maria B. "Development of a machine vision based oyster meat sorter." Thesis, Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/53225.
Повний текст джерелаАнотація:
Oyster meats are currently sorted by hand using volume as the sorting parameter. Hand grading is inaccurate, time consuming and costly. Previous research on physical properties of oyster meats showed a high correlation between projected area of oyster meats and their volume thus allowing the use of projected area measurements as a sorting criterion. A machine vision based oyster meat sorting machine was developed to mechanize the sorting process. The machine consists of a dark conveyor belt transporting singulated oysters through a grading station and then along a row of fast acting water jet valves which separates the stream of oysters into 3 classes. The vision system consists of a monochrome television camera, flash light illumination to "freeze" the images, a digitizer/transmitter and a Personal Computer as an image processing unit. Software synchronizes the flash light and digitization of images and calculates projected area of each meat using the planimeter method. The grading results are sent to a valve control board which actuates the spray valves. The sorting rate is 37 oyster meats/min with a sorting accuracy of 87.5%. A description of the design work, adjustment and l calibration procedures and a final sorting test is included.Master of Science
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Gibberd, J. T. (Jeremy). "Integrating sustainable development into briefing and design processes of buildings in developing countries : an assessment tool." Thesis, University of Pretoria, 2003. http://hdl.handle.net/2263/25525.
Повний текст джерелаАнотація:
This study proposes a specification for an assessment tool that integrates sustainable development into briefing and design processes of buildings in developing countries. The building and construction industry have a significant role to play in supporting sustainable development in developing countries. However until the implications of sustainable development for the building and construction industry in developing countries are understood and interpreted into a plan of action, little progress can be made. The research proposal aims to make a contribution to knowledge within the field of sustainable development and building and construction in developing countries. The study suggests that an effective way of beginning to integrate sustainable development into building and construction is to make sustainable development an explicit goal during the briefing and design process of the building. The study develops a specification for assessment tool that enables the goal of sustainable development to be interpreted into building and construction objectives and shows how this can be used in the briefing and design processes of buildings. The study is based on both a qualitative and quantitative approach. Through critical review of literature and inductive analysis key concepts pertaining to sustainability, sustainable development, developing country contexts, assessment frameworks, and building and construction are defined. These are compared and analysed to formulate a specification for an assessment tool. In order to test and validate findings the specification is compared with an existing building assessment tool, the Sustainable Building Assessment Tool. All hypothesis developed by the study are successfully demonstrated and the study is successful in proposing a specification for an assessment tool that integrates sustainable development into briefing and design processes of buildings in developing countries.Thesis (PhD(Architecture))--University of Pretoria, 2004.
Architecture
unrestricted
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Weiser, Michael. "Design smykového nakladače s nosností do 1t." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400845.
Повний текст джерелаАнотація:
The theme of this diploma thesis is design of skid steer loader with capacity up to 1 tonne. The result of this thesis is a conceptual solution of loader. It describes structural, technological, ergonomic and visual aspects with respect to current trends.
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Swanson, Davin Karl. "Implementation of arbitrary path constraints using dissipative passive haptic displays." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/17606.
Повний текст джерела
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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/.
Повний текст джерелаАнотація:
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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Eriksson, Emil. "Self-Balancing Robot Control System in CODESYS for Raspberry Pi : Design and Construction of a Self-Balancing Robot using PLC-programming tools." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-133990.
Повний текст джерелаАнотація:
The Department of Applied Physics and Electronics at Umeå University offers education and conducts research in the field of automation and robotics. To raise the competence in automation in the CODESYS development environment it’s proposed to build a remote controlled self-balancing robot as a testing platform which is then programmed using CODESYS for Raspberry Pi. The chassis of the robot consists of laser-cut plexiglass plates, stacked on top of each other and fixed using threaded rods, nuts and washers. On these plates the robots’ electrical components, wheels and motors are attached. The control system is designed as a feedback loop where the robots’ angle relative to the gravity vector is the controlled variable. A PID-controller is used as the system controller and a Kalman Filter is used to filter the input signals from the IMU board using input from both the accelerometer and the gyro. The control system is implemented in CODESYS as a Function Block Diagram (FBD) using both pre-made, standard function blocks and customized function blocks. By using the in-built web-visualization tool the robot can be remote controlled via Wi-Fi. After tuning the Kalman Filter through plot-analysis and the PID-controller through Ziegler-Nichols method the robot can stay balanced on a flat surface. The robots’ performance is tested through a series of test scenarios of which it only completes one out of four. The project ran out of time before further testing could be done. For future work one could improve the performance of the PID-controller through more sophisticated tuning methods. One can also add a steering-function or test different type of controllers.
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Tuncdemir, Safakcan. "Design Of Mini Swimming Robot Using Piezoelectric Actuator." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605682/index.pdf.
Повний текст джерелаАнотація:
This thesis deals with the design, fabrication and analysis of a novel actuator for a fish-like swimming mini robot. The developed actuator is tested on a mini boat. The
actuator relies on a novel piezoelectric ultrasonic motor, developed according to the design requirements of actuator for fish-like swimming mini robots. Developed motor is within the dimensions of 25x6x6 mm in a simple mechanical structure with simple driving circuitry compared to its predecessor. Bidirectional rotation of the motor is transformed to a flapping tail motion for underwater locomotion in a simple mechatronic structure. The simplicity in the motor and actuator enables
further development on the miniaturization, improvement on the performances as well as easy and low cost manufacturing. The developed actuator is a candidate to
be used in mini swimming robot with fish- like locomotion.
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Kluka, Ladislav. "Konstrukce hydraulické ohýbačky ocelových profilů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229274.
Повний текст джерелаАнотація:
This master’s thesis deals with design of a hydraulics bending machine. Bending machine will be used primarily for bending reinforcement bars in the shape of stapes. It consists of bending, sliding and chute system, which are located in the machine frame. Drive of each system is provided by a rotary and two linear hydraulic motors. Then there is described a hydraulic system and selection of its most important parts. Work is supplemented by visual documentation in the form of images of individual systems were processed in a CAD system Inventor 2010
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Guroglu, Serkan. "An Evolutionary Methodology For Conceptual Design." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606422/index.pdf.
Повний текст джерелаАнотація:
The main goal of this thesis is the development of a novel methodology to generate creative solutions at functional level for design tasks without binding solution spaces with designers&rsquoindividual experiences and prejudices. For this purpose, an evolutionary methodology for the conceptual design of engineering products has been proposed. This methodology performs evaluation, combination and modification of the existing solutions repetitively to generate new solution alternatives. Therefore, initially a representation scheme, which is generic enough to cover all alternatives in solution domain, has been defined. Following that, the evolutionary operations have been defined and two evaluation metrics have been proposed. Finally, the computer implementation of the developed theory has been performed. The test-runs of developed software resulted in creative alternatives for the design task. Consequently, the evolutionary design methodology presents a systematic design approach for less experienced or inexperienced designers and establishes a base for experienced designers to conceive many other solution alternatives beyond their experiences.
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Dawson, Evan Kent. "The effect of rapid tooling on final product properties." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/11189.
Повний текст джерела
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Groch, Luboš. "Design stavebního nakladače." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-229997.
Повний текст джерелаАнотація:
In my thesis I aim on design of front loader, which is most adapted to human operator. Human needs, repairman needs and requirements of civilization are fully respected. Loader is designed for near future.
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Coskun, Cagdas. "Software Development For Multi Level Petri Net Based Design Inference Network." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605278/index.pdf.
Повний текст джерелаАнотація:
This thesis presents the computer implementation of a multi resolutional concurrent, design inference network, whose nodes are refined by PNDN (Petri Net Based Design Inference Network) modules. The extended design network is named as N-PNDN and consists of several embedded PNDN modules which models the information flow on a functional basis to facilitate the design automation at the conceptual design phase of an engineering design. Information flow in N-PNDN occurs between parent and child PNDN modules in a hierarchical structure and is provided by the token flow between the modules. In this study, computer implementation of the design network construction and token flow algorithms for the N-PNDN structure is restored and therefore the previous DNS (Design Network Simulator) is adapted for the multi layer design and decomposition of mechatronic products. The related algorithms are developed by using an object oriented, visual programming environment. The graphical user interface is also modified. The further developed DNS has been used for the application of the N-PNDN structure in the conceptual design of 5 mechatronic systems. In the guidance of this study, it has been understood that the further developed DNS is a powerful tool for designers coming from different engineering disciplines in order to interchange their ideas.
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Galitsky, Joshua. "Paving the Mega Cities : Dynapac Red Carpet." Thesis, Umeå universitet, Institutionen Designhögskolan, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-67503.
Повний текст джерелаАнотація:
While the design and the technology behind the vehicles we drive has gone a long way, the main principle in which we construct our roads today, the materials and the machinery we use to do it has hardly changed for the last 40 years.This project takes a fresh look at an industry that has remained stagnant for several decades. Looking into a future in which large Mega-Cities will develop, the aim of this project will be to develop a new solution for constructing and maintaining the transport arteries in those cities. This project was performed in collaboration with Dynapac, a leading manufacturer of road construction equipment, with supporting feedback from NCC roads, the Scandinavian road construction group.
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Cherupally, Sai Kiran. "Hierarchical Random Boolean Network Reservoirs." PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4345.
Повний текст джерелаАнотація:
Reservoir Computing (RC) is an emerging Machine Learning (ML) paradigm. RC systems contain randomly assembled computing devices and can be trained to solve complex temporal tasks. These systems are computationally cheaper to train than other ML paradigms such as recurrent neural networks, and they can also be trained to solve multiple tasks simultaneously. Further, hierarchical RC systems with fixed topologies, were shown to outperform monolithic RC systems by up to 40% when solving temporal tasks. Although the performance of monolithic RC networks was shown to improve with increasing network size, building large monolithic networks may be challenging, for example because of signal attenuation.
In this research, larger hierarchical RC systems were built using a network generation algorithm. The benefits of these systems are presented by evaluating their accuracy in solving three temporal problems: pattern detection, food foraging, and memory recall. This work also demonstrates the functionality of random Boolean networks being used as reservoirs. Networks with up to 5,000 neurons were used to 200 sequences from memory and to identify X or O patterns temporally. Also, a Genetic Algorithm (GA) was used to train different types of hierarchical RC networks, to find optimal solutions for food-foraging tasks.
This research shows that about 80% of the possible different hierarchical configurations of RC systems can outperform monolithic RC systems by up to 60% while solving complex temporal tasks. These results suggest that hierarchical random Boolean network RC systems can be used to solve temporal tasks, instead of building large monolithic RC systems.
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Gomes, Ivan Alexandre Cotrick 1960. "Sistema especialista para a trefilação a frio de barras de aço." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265776.
Повний текст джерелаАнотація:
Orientador: Sérgio Tonini ButtonDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
Made available in DSpace on 2018-08-28T00:05:58Z (GMT). No. of bitstreams: 1 Gomes_IvanAlexandreCotrick_M.pdf: 5091688 bytes, checksum: ddbd83343728d06fb6e89b21a3a06d98 (MD5) Previous issue date: 2015
Resumo: O processo de conformação plástica através da trefilação a frio de barras de aço tem como principal dificuldade o projeto da ferramenta. Ainda hoje, projetistas lançam mão de ábacos e tabelas colecionados ao longo do tempo através dos sucessos e insucessos experimentais. Tais informações, normalmente, ficam restritas às empresas ou aos poucos técnicos, dentro das suas bibliotecas particulares, onde, devido à dificuldade de acesso às informações práticas para projetar ferramentas e processos mais complexos, a fabricação de perfis trefilados tem perdido espaço para outros meios produtivos, por vezes, mais onerosos. Assim, este trabalho compila ábacos e tabelas presentes em projetos de ferramentas para trefilação ¿ seja através das experiências próprias, seja dos resultados herdados de outros técnicos ¿ e também, o escasso material bibliográfico sobre o assunto, organizando um banco de dados para a modelagem de um método que auxilie assertivamente as tarefas do projeto para ferramentas para trefilação a frio de barras de aço, utilizando-se de programas comerciais de computador. Cabe salientar que o sistema não é definitivo, dessa forma, o programa fonte é aberto e detalhado para que seja analisado e melhorado, sendo indicados os pontos de atenção onde devem ser inseridas ou modificadas informações, tornando o acesso amigável para aderência às particularidades do processo onde for aplicado
Abstract: The process of plastic conformation by cold drawing of steel bars has it's main difficulty in the tool design. Even today, designers have abacuses and tables built over time through the successes and failures experimental. Such collections of information, usually, are restricted to companies or few technicians within their private libraries Due to the difficulty of access to practical information to design tools and more complex processes, the manufacture of cold drawn profiles has lost ground to other, sometimes more expensive, productive means. This work compiles abacuses and tables collected in my 30 years in cold drawing tools' design - either through my own experiences, either from inherited results of the private collections of other technicians - and also, the scarce bibliography about the subject, organizing a database for modeling a method that assertively assists the project tasks for cold drawing steel bars tools, using commercial software. The system is not final, thereby the program has open source and detailed for to be analyzed and improved, being indicated the points where must be inserted - or changed - information, making friendly access to the particularities of the production process where it will be applied
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica
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Zheng, Wenbo, and Hongxi Zhong. "Reconfigurable Machine Tools Design Methodology." Thesis, KTH, Industriell produktion, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-119082.
Повний текст джерелаАнотація:
In today’s industry, the competitive market, the short life time of the products and rapid change in customer demand forms a big trend of appearance of new manufacturing system. Reconfigurable Machine Tool (RMT) is a kind of solution for future machining systems, thus it can not only provide customized solutions to the operation requirements but also is cost-effective. Thethesis aims to create and implement methodology of RMT design for manufacturing industry. The methodology is introduced and extended according to the five principals of modular machine tool design. The methodology will be applied step by step herein so as to make the methodology more clear. First of all is to get the concept or process requirements from the customer. The customer requires three reconfigurable part families for a high speed milling application including tables, spindles, and cutters. In this case, to fulfill customer’s requirements and concept, the dual spindle (Multi-tool) RMT is selected as an example to interpret the RMT design methodology. Secondly, the most important point in methodology of RMT design is to analyze the valuable proposal of the four principles of modular design based on extensive experience. This work turns the four principles, separation, and unification (standardization), connection, and adaptation, to practical design methodology. Based on the classical four principles, the principle of reusability is an addition principal in consider of zero waste concept. In order to perform the RMT design methodology effectively, it is necessary to complement the advantages of the reconfiguration in dual spindle RMT design and the reconfiguration for other part families in according to the RMT design methodology. A final step utilizes computer software to model the configuration in 3 dimensions. And evaluations can be discussed in Degree of Freedom (DOF), stiffness analysis and number of modules.
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Dhairyawan, Amit. "Internet Tools for Machine Design." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/36488.
Повний текст джерелаАнотація:
The aim of this thesis is to provide academic support to the oldest discipline of Mechanical Engineering, namely "Machine Design".
The rapid pace of technological development drives every individual, especially students. The industrial revolution in the first half of the 19th century contributed greatly to the advancement of Mechanical Engineering. The theories and experimental data from that time, some developed almost a hundred years ago are still in use in the original form while others have evolved to keep up with the times.
This thesis attempts to bring some of that classical machine design theory into a modern user-friendly form that is portable across the Internet.
Here the user will be presented with an interactive menu of topics of Machine Design where each is split sub-categorically as Theory and Application.
According to the choice made, short excerpts of theory are presented on the chosen matter. The theory will include but not be limited to the important relationships relevant to the design of the particular machine element.
After the review of the Theory, the user will be able to navigate to the application where the relationships from the theory will be awaiting user input in the form of solvers.
Since the primary emphasis of the thesis is about cultivating knowledge of the underlying theory, the applications will not be self-correcting or self-assuming.
The user will need to understand the relationships sufficiently well prior to using the applications to solve homework or design assignments.
The created Toolbox is available to all registered users through a login access. The user can then choose to review theory or directly access the applications of the described theory.
The thesis successfully demonstrates the use of the Internet as the media for education.Master of Science
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Masat, Mehmet. "Design And Implementation Of Hot Precision Forging Die For A Spur Gear." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608550/index.pdf.
Повний текст джерелаАнотація:
There is a strong need in forging industry to reduce waste of material, improve quality, and reduce cost of forgings. About 30% of the material is wasted during conventional closed-die forging. Therefore, in order to reduce the cost of forged products and to obtain near-net or net shape parts, new forging methods should be applied. Precision forging concept is a cost-effective way to produce net-shape or near-net shape components. In recent years, there has been an increased interest in the production of gears by the net-shape forging technique. This has specific advantages over the traditional manufacturing processes of cutting gears such as hobbing, turning, and grinding including savings on cost and raw material, increased productivity, and gears with higher
dynamic properties than conventionally cut ones.
In this study, precision forging of a particular spur gear has been investigated. The precision forging die set has been conceptually designed and
modeled in a computer aided design environment. The forging process of particular spur gear has been simulated by using a commercially available finite volume program. After the successful simulation results, the prototype die set
and the tube-shaped billets were manufactured. The real-life experiments have been realized by using 1000 tons mechanical forging press available in METUBILTIR
Research and Application Center Forging Laboratory. The results have been compared with the computer simulations. After the real-life experiments, it has been observed that the conceptual die design is appropriate and near-net
shape spur gears are successfully obtained by the proposed precision forging die set.
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McClure, Kerry S. "The use of object-oriented tools in the development of a pilot's vision simulation program to aid in the conceptual design of aircraft." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07292009-090340/.
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