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1

Rose, Garrett. "Electrical subsystem for Shell eco-marathon urban concept battery powered vehicle". Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/2814.

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Thesis (Master of Engineering in Electrical Engineering)--Cape Peninsula University of Technology, 2018.
The purpose of this paper was to design and develop an electrical power train for an Urban Concept electric vehicle geared to complete the Shell Eco-Marathon Africa in 2019. Various technologies which make up the electrical drive train of an electrical vehicle were also reviewed which include the battery pack, the battery management system, the motors, the motor management system and the human interface. Upon completion of this, the various topologies best suited for this project were selected, designed, constructed and developed. Two motors were re-designed and constructed for this vehicle and the motor drive was also constructed to control these motors. A Lithium-Ion battery pack was constructed and developed to drive the motors and an off-the-shelf battery management system was purchased and developed to suit the requirements for the Shell Eco- Marathon competition rules. A human interface was also developed in order for the driver to see various parameters of the electric vehicle defined by the Shell Eco-Marathon competition rules. After each component of the drive train was constructed, they underwent various testing procedures to determine the efficiency of each individual component and the overall efficiency for the complete drive train of this electric vehicle was ascertained. The Product Lifecycle Management Competency Centre group developed the chassis for this vehicle. For this reason, only the electric subsystems were evaluated and a simulation was completed of the complete drive train. After the complete drive train was constructed and all the individual subsystems evaluated and simulated, a vehicle with an overall efficiency of about sixty percent was expected and the completed drive train should be adequate enough to complete the entire Shell Eco-Marathon Africa circuit.
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2

Sikora, Celso Gustavo Stall. "Scheduling projects in operating systems: an application on assembly line balancing". Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/2859.

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Fundação Araucária; RENAULT; Seti
A Pesquisa Operacional investiga as (melhores) formas de se configurar e coordenar sistemas ou operações usando técnicas de otimização. Geralmente, a otimização de um sistema é modelado com base no estado final almejado. Porém, como atingir ou implementar tal estado final em sistemas é pouco retratado na literatura. Esta dissertaçãode mestrado propõe uma nova classe de problema de otimização: a programação das operações entre o estado inicial e o final de um sistema, o Problema de Implementação. A programação das operações é especialmente importante para linhas de montagem. A indústria automobilística é fortemente baseada em linhas de produção que podem ser usadas até 24 horas por dia. Assim, as oportunidades de intervenções para mudar ou otimizar o sistema produtivo são poucas. As condições de implementação aplicadas ao balanceamento de linhas produtivas são discutidas, e as características observadas resultam no proposto Problema de Implementação de Linhas de Montagem (PILM). Na dissertação, um guia de modelagem baseado em Programação Linear Inteira Mista (PLIM) é desenvolvido para a formulação de diversas variações do Problema de Implementação. As instruções de modelagem são usadas para desenvolver um conjunto de modelos PLIM para o Problema de Implementação de Linhas de Montagem. Para a obtenção de resultados, um conjunto de instâncias é proposto. Assim, uma análise de sensibilidade em função de cada um dos parâmetros formadores das instâncias é realizada. As formulações são comparadas, junto com as diferentes formas de apresentar e resolver o problema. Ademais, um método de decomposição é usado para resolver um problema industrial real. A modelagem mostrase correta para a divisão da implementação de mudanças em linhas de montagem. Os resultados mostram que a divisão do esforço de implementação resulta em apenas poucas mudanças a mais (cerca de 7% para os casos pequenos e médios) comparadas com a implementação em uma fase. A possibilidade de programar a implementação em etapas menores aumenta a aplicabilidade de projetos, que, de outra forma, requeririam grande paradas de produção.
Operations Research investigates the (best) ways to configure and coordinate systems or operations with optimization procedures. Usually, the optimization of a system is modeled based on the aimed final configuration. However, little is published about how to reach or implement such optimal configurations in the systems. This master thesis proposes a new class of optimization problem: a scheduling of operations between initial and final states of a system, the Implementation Problem. The scheduling of operations is especially important to assembly lines. The automotive industry strongly relies on production lines that can operate 24 hours a day. Thus, the intervention opportunities to change or optimize the production system are very few. The implementation conditions of balancing on assembly lines are discussed, and the observed characteristics result in the proposal of the Assembly Line Implementation Problem (ALIP). The master thesis proposes a Mixed-Integer Linear Programming (MILP) modeling guide for the formulation of several variations of Implementation Problems. The modeling instructions are used to develop a set of MILP models for the Assembly Line Implementation Problem. For the results, a dataset is proposed and a sensitivity analysis on each of the consistent parameters of the dataset is performed. The proposed formulations are compared, along with the different forms of presenting and solving the problem. Furthermore, a decomposition method is used to solve a real-world industrial problem. The modeling correctly represents the division of the implementation of changes in assembly lines. The results show that the division of the effort in multiple stages only need a few more changes (around 7\% for the small and medium cases) comparing to a straightforward implementation. The possibility of scheduling the implementation in smaller steps increases the applicability of projects that otherwise would require a large system's stoppage time.
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3

Wong, Yuk-sum. "System design and energy management strategy for hybrid electric vehicles". Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/HKUTO/record/B3955885X.

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4

Sivapurapu, Sai Vinay Kumar Plummer Mitty Charles. "Preliminary design of a cryogenic thermoelectric generator". [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-3612.

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5

Staples, Judd W. "Optimizing the allocation of resources during preliminary automobile design". Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/17975.

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6

詹宜巨 y Yiju Zhan. "A high performance switched reluctance motor drive for electric vehicles". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31238026.

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7

Matteson, Arthur W. "Design and control of a multilevel inverter for electric vehicles". Diss., Connect to online resource - MSU authorized users, 2008.

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8

de, Vos Neil. "Design of a new protective isolating side-door : a virtual model to simulate ingress and egress motion for micro-mobility vehicles". Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2468.

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Thesis (MTech (Industrial Design))--Cape Peninsula University of Technology, 2016.
This paper is positioned within the broader context of public transportation systems, with specific focus on the development of urban micro first and last mile mobility solutions, and what it could mean for individuals and the economy. Globally, urban problems such as traffic congestion, poor public transport integration, and carbon emissions are forcing us to rethink traditional means of transport. Large fossil-fuelled vehicles and limited public transport infrastructure characterize South Africa’s transport market. Despite the growth in car use, public transport and walking are still the predominant “lifeline” forms of mobility for the vast majority of South Africans in order to access work, schools and services. Moreover, the lack of public transport services in key economic corridors and rural areas of South Africa, the role of the metered taxi industry which is currently effectively limited to serving only the needs of the tourist market due to high charging regimes, and finally, the absence of an effective inner city transport system endorses the lack of first and last mile transportation solutions, and the integration thereof with other transport mediums. This adds to the conflict commuter’s face on a daily basis in obtaining a seamless distribution of transport services. 80% of trips in urban areas are less than 3km, placing urban micro mobility vehicles in an ideal position as a solution to transportation. This describes the investigation conducted into micro-mobility trends within South Africa to identify a key mode of transport that would comply with the stated requirements, and allow accessibility to commuters within the city and to the surrounding communities. In 2014, Mellowcabs, which are electric public transport vehicles that provide first and last mile transport services, was identified as a promising candidate within the local micro-mobility vehicle context. They were in need of a design input for their immediate next requirement, which thus describes the development of a good protective side door system that would isolate passengers in adverse weather conditions, whilst similarly affording comfort and safety features found in normal passenger vehicles. The design process is focused on creating a new side door, however, at the same time the product should be, elegant, smart, fashionable, comfortable, economical, maneuverable and safe. In addition, the virtual product lifecycle management tool, CATIA, allows the design team to get feedback in terms of physical-based data that correspond to how the door could hinder the passengers interaction while they ingress and egress the vehicle. This enables us to try various designs to perform a comparative study without building a single physical prototype.
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9

Zhu, Min. "Design of automotive joints : using optimization to translate performance criteria to physical design parameters /". Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06062008-165515/.

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10

Fillmore, Paul F. "Design, construction, and testing of a hysteresis controlled inverter for paralleling". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03sep%5FFillmore.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, September 2003.
Thesis advisor(s): Robert Ashton, Xiaoping Yun. Includes bibliographical references (p. 69-70). Also available online.
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11

Zhao, Gui Quan. "Design, control and experimental testing of intelligent variable dual-fuel automotive engines". Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3691635.

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12

黃毓琛 y Yuk-sum Wong. "System design and energy management strategy for hybrid electric vehicles". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B3955885X.

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13

Cawood, Gareth James. "Design of a low-cost autonomous guided cart for material handling". Thesis, Nelson Mandela Metropolitan University, 2015.

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This dissertation covers the design and manufacture of an autonomous guided cart (AGC) for use in the material handling industry. General Motors South Africa (GMSA) requires a low-cost AGC for use in their Struandale plant. A budget of R35 000 per unit was proposed. The researcher, in collaboration with staff at GM, compiled a list of engineering requirements for the AGC. After research into the unique problems of the project, an examination of a previous design attempt by staff of GM Thailand, the researcher developed a new design, the subject of this report. Different solutions for each design problem were investigated before the design was finalised. A three-wheeled vehicle was designed making use of two motors in a differential-drive setup to control motion. Navigation is via a line-following mechanism, using an induction sensor-array in conjunction with a pre-laid metallic strip. To aid the design, the system was modelled to understand the different control elements at play. The researcher developed software for several aspects of the design: for the PLC controlling the system and motors; for a microcontroller that communicates with the PLC and a wireless module; for a computer server that communicates with a second wireless device, receiving information from the PLC; and a web interface to view this information. These form the SCADA integration of the project. The final product meets the GMSA specifications. It is a robot capable of towing a trolley of mass not exceeding 350 kg. While the robot is able to navigate a pre-laid route, it cannot reliably stop at marked locations. It is possible to monitor the system via a web-interface. The robot is capable of operating for an entire 8-hour shift before the batteries need to be recharged. The total cost of the prototype was R26 340.
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14

Lopes, Thiago Cantos. "Balancing optimization of robotic welding lines: model and case study". Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/2621.

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FA; UTFPR; RENAULT
Linhas robóticas de solda são comuns na indústria automobilística. Durante a produção de um veículo, sua estrutura metálica precisa ser soldada em um único corpo resistente. Isso é feito por meio de centenas de soldas a ponto por resistência, cada uma liga localmente duas ou mais placas metálicas. Distribuir eficientemente esses pontos entre robôs é particularmente desafiador, levando em conta que: cada robôs podem fazer acessar uma parte dos pontos de solda, há tempo de movimentação entre pontos e robôs podem colidir entre si se ocuparem o mesmo espaço físico ao mesmo tempo. Há muitas maneiras factíveis de distribuir pontos de solda. No entanto, cada uma gera um resultado econômico diferente: Se um robô soldar muitos pontos se tornará um gargalo e reduzirá a taxa média de produção.Obter o conjunto de decisões operacionais que gera o melhor desempenho é o objetivo de técnicas de otimização. Há uma ampla variedade de técnicas descritas na literatura de pesquisa operacional e ciência da computação: modelos matemáticos, algoritmos, heurísticas, meta-heurísticas, etc. No contexto industrial, tais técnicas foram adaptadas para diversas variantes de problemas práticos. No entanto, estas adaptações só podem resolver as variantes para as quais foram idealizadas. Se por um lado podem se traçar paralelos entre vários aspectos de linhas robóticas de solda e tais variantes, por outro o conjunto completo de características das linhas estudadas não é tratável por (ou convertível em) nenhuma delas. A presente dissertação desenvolve uma abordagem para otimizar tais linhas, baseada em um modelo de programação linear inteira mista desenvolvido para descrever o problema. Ela também apresenta um estudo de caso para discutir e ilustrar possíveis dificuldades de aplicação e como superá-las. O modelo apresentado foi aplicado a dados de uma linha robótica de solda da fábrica, composta por quarenta e dois robôs, quatro modelos de veículos e mais de setecentos pontos de solda por veículo. A média ponderada da redução em tempo de ciclo obtida pelo modelo foi de 17.5%. Variantes do modelo, concebidas para auxiliar trabalhos futuros, são apresentadas e discutidas.
Robotic welding manufacturing lines are production lines common in automobile industries. During a vehicle's production, the vehicle's metal structure must be welded in a single resistant body. This is made by hundreds of spot-welding points, each of which tie locally two or more metal plates. Efficiently distributing these welding points amongst robots is particularly challenging, taking in account that: not all robots can perform all weld points, robots must move their welding tools between weld points, and robots might interfere with one another if they use the same geometrical space. There are multiple feasible manners to distribute the welding points. However, each of these forms generates different economical results: If a robot performs too many points, it will become a line bottleneck and reduce average throughput. To find the set of operational decisions that yields the best output is the goal of optimization techniques. There are a wide variety of such techniques described in operations research and computer sciences literature: mathematical models, algorithms, heuristics, meta-heuristics, etc. In the industrial context, these techniques were adapted to related line balancing problems. However, these adaptations can only solve the specific variants they were designed to address. While parallels can be drawn between aspects of robotic welding lines and many of such variants, the full combined set of characteristics of the studied lines is not treatable by (or convertible to) any of them. This dissertation develops a framework to optimize such lines, based on mixed-integer linear programing model developed to describe the problem. It also presents a case study to discuss and illustrate possible difficulties and how to overcome them. The presented model was applied to data from the factory's robotic welding lines composed of forty-two robots (divided in thirteen stations), four vehicle models and over seven hundred welding points for each vehicle. The weighted average reduction percentage in cycle time obtained by the model was 17.5%. Model variants, designed to aid further works are presented and discussed.
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15

Stevens, John Wesley. "A design of a low-cost propulsion system for an electric scooter". Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/17885.

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16

Crowe, Robert A. "Design, construction and testing of a reduced-scale cascaded multi-level converter". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FCrowe.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, June 2003.
Thesis advisor(s): Robert W. Ashton, John G. Ciezki, Douglas J. Fouts. Includes bibliographical references (p. 125-126). Also available online.
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17

Flory, Isaac Lynnwood. "Modeling, analysis, and design of a 10 kVA, 20 kHz transformer". Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-05042010-020300/.

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18

Brackin, Margueritte Patricia Dodd. "Translating the voice of the customer into preliminary design specifications". Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/17936.

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19

Buchmann, Macro. "Advanced monitoring system for bolted connections in vehicle construction". Thesis, Nelson Mandela Metropolitan University, 2010. http://hdl.handle.net/10948/1417.

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Bolted connections where used from the beginning of vehicle construction for joining two or more parts. The reliability of bolted connections is still a major problem. The objective of this research thesis is focused on an advanced monitoring system for bolted connections in vehicle construction. A mechanical “vibrating test bench”, which was developed by the aeronautical engineer Mr. Junkers, is being adapted, to suite the requirements of the automotive industry. It is designed according to DIN 65151 standards. The bolted connection is tightened to a specific torque to achieve the required preload forces and then exposed to an oscillating elastic shear force. The preload force and their loss are measured in relation to the number of load cycles. The ideal locking mechanism would be, if no settling occurs. Realistic in practice is the remaining of a sufficient preload force which doesn’t decry with time. The aim of this thesis is, to gain knowledge that will assist in the future control of the bolt locking procedure. The test bench can be used to verify the clamping capability of a bolted connection. With the dynamic computer-aided test system it will also be possible to test critical bolted joints and their safety, which reduces the probability of costly product recalls, or even severe cases of failure.
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20

Headley, F. Anthony Jr. "Performance limitations of an ejector heat pump". Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/20290.

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21

Yu, Chuang y 余创. "Design, analysis and control of flux-mnemonic permanent magnet brushless machines". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44769027.

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22

Fan, Ying y 樊英. "Design, analysis and application of brushless doubly salient machines". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B36762854.

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23

Alexandrou, Alexandros. "Design of filter banks for subband coding systems". Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63318.

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24

Coetzee, Gerhardus Johannes. "Universal design in automobiles : an investigation into simulators for differently abled drivers". Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2469.

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Thesis (MTech (Industrial Design))--Cape Peninsula University of Technology, 2016.
Simulators are used for many different purposes, among them physical rehabilitation and the training of differently abled learner-drivers. In South Africa, however, the extent of the latter type of simulators is limited to paraplegic learner-drivers only. The reason is that locally sourcing the necessary equipment to adapt commercial simulators for the training of differently abled learner-drivers presents a problem. The concept of Universal Design stipulates that as many individuals as possible should be able to use a particular product. Consequently, a simulator for differently abled learner-drivers should accommodate as many such persons as possible. However, applying Universal Design in the area of design researched for the present dissertation adds further complexity due to the unique nature of the physical limitations experienced by individuals. A differently abled driver puts an extreme constraint on the design of a product - and becomes a limiting user. Nevertheless, this dissertation adopts a Universal Design approach to investigate the possibility of designing such a simulator in South Africa, as well as its viability. A limiting user was included in the research to represent the bigger differently abled community. Field research was carried out by implementing a Participatory Design process. Furthermore, a team was selected according to a Meta-Design mind-set, including professionals from engineering, clinical psychology and occupational therapy. The leader and researcher was an industrial designer.
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25

Tam, Kuok San. "Design and analysis of an electro-hydro-mechanical variable valve actuator for four-stroke automobile engines". Thesis, University of Macau, 2011. http://umaclib3.umac.mo/record=b2493685.

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26

Gyawali, Shashi Raj. "Design and construction of helmholtz coil for biomagnetic studies on soybean". Diss., Columbia, Mo. : University of Missouri-Columbia, 2008. http://hdl.handle.net/10355/5686.

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Thesis (M.S.)--University of Missouri-Columbia, 2008.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 12, 2009) Includes bibliographical references.
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27

Han, Lin 1982. "A comparison of permanent magnet motor structures for traction drive applications in hybrid electric vehicles /". Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116015.

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This thesis presents a detailed comparison of the torque-speed characteristics of three permanent magnet synchronous machine designs based on how the magnets are mounted. The machines investigated are an interior permanent magnet machine, an interior-rotor surface-mounted machine and an exterior-rotor surface-mounted machine. They are designed for traction drives in hybrid electric vehicles. Two sets of comparisons based on the same machine volume and starting torque are performed. Important issues, such as machine mass and cost, cogging torque, and flux-weakening capability are addressed. Computer simulations were performed to estimate their performances and the results are presented. Design guidelines and tradeoffs of their performances are extracted from the simulation results. Relative strengths and limitations of different PM machine types are highlighted.
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28

夏偉 y Wei Xia. "A new phase decoupling permanent magnet brushless DC motor and its control". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31235426.

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29

Gan, Jinyun y 干金云. "Design, analysis and control of multiphase flux regulated permanent magnet brushless DC motor drives". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31245304.

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30

Fox, Alan Sherwood. "An enhanced design procedure for microstrip band pass filters". Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-05022009-040349/.

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31

Amezquita, Tony. "Lean remanufacturing in the automotive industry". Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/23166.

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32

Hildermeier, Julia. "How Ideas Change Markets : Social and Semantic Construction(s) of Automobility in 21st century Europe". Thesis, Cachan, Ecole normale supérieure, 2015. http://www.theses.fr/2015DENS0022.

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Cette thèse cherche à comprendre et développer comment les trajectoires institutionnelles émergent, tant empiriquement que théoriquement. Sur la base d’une étude de cas de l’industrie et la culture automobile, elle identifie les trajectoires de PATH DEPENDENCY, historiquement (chap.1) et théoriquement (chap.2). Dans une approche méthodologique qualitative, les chapitres 4 et 5 identifient les effets des conflits environnementaux dans l’industrie que remettent en cause la justification de sa structure même. L’analyse empirique de différents conflits autour des standards des émissions des voitures, les innovations technologiques comme le moteur électrique montrent que l’automobilité de demain, et le secteur, vont évoluer de manière plus pluraliste et hétérogène qu’avant. Si parmi les deux scenarios de développement une trajectoire institutionnelle stable émerge, elle dépend de si un narratif cohérent peut émerger, qui rend compréhensible et évident les relations entre offre, demande et réglementation pour les acteurs. La conclusion (ch.6) identifie les conditions d’émergence de nouvelles trajectoires institutionnelles : dans les conflits où un narratif alternatif est déjà présent, mais sous-jacent, des nouvelles structures organisationnelles et sémantiques peuvent émerger
This PhD thesis seeks to understand how institutional paths emerge, theoretically and empirically. Taking the case of the European automobile industry and culture it revisits how path dependency can emerge historically (chapter 1) and theoretical patterns of path production (chapter 2). Based on qualitative research design (chapter 3), the case study identifies possibilities of path rupture through environmental conflicts in automobile history (chapter 4 and 5). It shows that through path ruptures and the emergence of new paths following new environmental requirements, 21st century automobility builds pluralistic and more heterogeneous semantic and organizational structures. Geographic and local conditions such as city planning and infrastructure matter in shaping vehicle use and culture in the future, as well does the distribution of decision making power on different political levels. Chapter 6summarize s and reflects the results of my micro-analytical study as parts of an emerging theory of path creation. If the analyzed trajectories of scenarios for the automobile sector become reality, either electrified automobility or electric multimodality, depends on whether they build a coherent narrative that ‘make sense’ of offer, demand and regulation in the sector. The case study showed that these coherent narratives can emerge when conflicts render visible already existing counter-narratives. These counter-narratives emerge in situations of crisis, such as when new environmental regulation determines technological development and behavioural adaptation in automobility. Once accepted, they create a new path – a new semantic and organizational structure in society
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33

Khoudeir, Riad Truchot Patrick. "L'amélioration de l'habitabilité automobile de demain l'application des principes de la construction architecturale de la maison dans la conception de l'habitacle des concepts-cars /". S. l. : S. n, 2007. http://www.scd.inpl-nancy.fr/theses/2007_KHOUDEIR_R.pdf.

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34

Ni, Meng Yang. "Design of bandpass filter based on cross-shaped slotline resonators". Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3691134.

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35

Loyer, Bruno. "Conception fonctionnelle robuste par optimisation multicritère de systèmes de suspension automobile passifs et semi-actifs". Ecully, Ecole centrale de Lyon, 2009. http://bibli.ec-lyon.fr/exl-doc/TH_T2152_bloyer.pdf.

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La conception de systèmes équipant les véhicules automobiles est de plus en plus contrainte, tant pour des questions de concurrence et de réduction des coûts et délais de développement qu’en raison d’évolutions techniques et réglementaires des produits (amélioration généralisée de la qualité et de la sécurité, introduction de prestations nouvelles, etc. ). Dans un tel contexte, la satisfaction du client impose aux constructeurs de prendre en compte, très tôt dans les projets, la robustesse des véhicules qu’ils proposent, c’est-à-dire la stabilité des niveaux de performances annoncés vis-à-vis des incertitudes dues à la variabilité des conditions d’utilisation, aux dispersions de fabrication (géométrie, assemblage ou propriétés mécaniques) ou encore, au vieillissement des composants. En plus du grand nombre de paramètres, de contraintes et de prestations à considérer, cette conception robuste, qui suppose la simulation numérique de ces incertitudes, impose de recourir à une stratégie de conception « à coût faible et à coup sûr », hiérarchisée, s’intégrant parfaitement dans le contexte du cycle en V de l’Ingénierie Système. La démarche First Design, mise en oeuvre dans de précédents travaux est une stratégie possible. L’objectif de cette thèse est d’en étendre certains aspects et de l’appliquer à l’optimisation fonctionnelle robuste de niveau 5 (dans le jargon Renault) des systèmes définissant la Liaison au sol des véhicules automobiles : trains roulants et variables fondamentales des pneumatiques. Il s’agit donc de développer les modèles ainsi que les outils d’optimisation et d’aide à la décision associés qui permettront de définir une procédure globale et fiable de spécification de ces systèmes, intégrant de façon quantifiée cette notion de robustesse. L’approche utilisée, fondée notamment sur des modèles physiques simplifiés et des estimateurs de sensibilité directement intégrés aux algorithmes d’optimisation, a amélioré de façon significative la robustesse des solutions et permis de mettre en évidence les gains associés à la prise en compte en amont de la présence de systèmes pilotés
In the last few years, extreme competition between car manufacturers led to higher quality and safety standards, and reduction of costs and delays in product development. Together with technical and regulation evolutions, this caused the design of vehicle subsystems to become more and more constraint. In such a context, designers who want to meet customer requirements have to take the robustness of their products into account, even at early stages of the design process. Indeed, due to the variability of the product itself (in terms of geometrical or mechanical properties, of assembly or ageing of components), or its operating conditions, the stability of the announced performance levels has to be specified and guaranteed, in presence of uncertainty. In addition to high numbers of design variables, constraints and objectives, this ‘robust design’ requires a numerical simulation of this uncertainty. Therefore, a reliable, hierarchized and computationally efficient methodology that fully complies with the V-diagram of Systems Engineering is needed. The First Design methodology is one possible approach. It was successfully used in previous works. The aim of the present thesis is to extend some of its features, and apply it to the robust optimization of the ‘level 5’ functional architecture of automotive suspension systems: front and rear axle design parameters and primary variables of the tires. For this purpose, models and associated tools for optimization and computer-aided decision have to be developed in order to define a global and reliable procedure for the specification of these systems, with a fully integrated and quantified notion of the robustness. The proposed technique, partly relying on physical simplified models and sensitivity estimators directly integrated in the used optimization algorithms, improved the robustness of the solutions significantly, and emphasized the performance gains achieved by taking the presence of semi-active components into account, at early phases of the project
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36

Sivapurapu, Sai Vinay Kumar. "Preliminary design of a cryogenic thermoelectric generator". Thesis, University of North Texas, 2007. https://digital.library.unt.edu/ark:/67531/metadc3612/.

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A cryogenic thermoelectric generator is proposed to increase the efficiency of a vehicle propulsion system that uses liquid nitrogen as its fuel. The proposed design captures some of the heat required for vaporizing or initial heating of the liquid nitrogen to produce electricity. The thermoelectric generator uses pressurized liquid nitrogen as its cold reservoir and ambient air as the high-temperature reservoir to generate power. This study concentrated on the selection of thermoelectric materials whose properties would result in the highest efficiency over the operating temperature range and on estimating the initial size of the generator. The preliminary selection of materials is based upon their figure of merit at the operating temperatures. The results of this preliminary design investigation of the cryogenic thermoelectric generator indicate that sufficient additional energy can be used to increase overall efficiency of the thermodynamic cycle of a vehicle propulsion system.
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37

Low, Yee Weng. "Techno-economic model for designing marine and offshore power generating systems". Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/15868.

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38

Köroğlu, Mustafa Hadi. "High frequency integrated filters for wireless applications". Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/14458.

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39

Stack, Jason R. "Fault signature detection for rolling element bearings in electric machines". Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/13276.

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40

Khan, Bruno Shakou. "Optimization of the fuel consumption of a parallel hybrid electric vehicle". Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/16763.

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41

Porandla, Sachin Kumar. "Design optimization of a parallel hybrid powertrain using derivative-free algorithms". Master's thesis, Mississippi State : Mississippi State University, 2005. http://sun.library.msstate.edu/ETD-db/ETD-browse/browse.

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42

Collins, Edward Randolph Jr. "Torque and speed control of single-phase induction motors using an adjustable amplitude and phase angle auxiliary winding power supply". Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/15472.

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43

Legesse, Michael. "Coupled simulation of an indirect field oriented controlled induction motor drive". Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116014.

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Conventionally, system simulations of induction motor drives use lumped parameters model of the motor. This approach assumes motor parameters to be constant during the entire operation of the drive. Unfortunately, these are known to vary significantly over the operating range of the motor due to factors such as magnetic saturation, skin effects, and operating temperature. The variations in motor parameters affect motor output and control parameters resulting in degraded drive performance. One way of overcoming this problem is by coupling the field model of the induction motor with the drive simulation. By replacing the lumped parameters model with the field model, the influence of different operating conditions on motor parameters can be taken into account dynamically. In this thesis such an approach is investigated by coupling the finite element analysis of an induction motor with the system simulation of the field oriented controlled drive. The results obtained for the coupled simulation are promising and possible future works to make this method of simulation more accurate and reliable are recommended.
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44

Hausgen, Paul E. "A thermal analysis of an alkali metal thermal to electric converter with geometrically designed interior surfaces exhibiting directionally dependent radiative properties". Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/16701.

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45

Martin, Benjamin C. "Geometric Design Optimization of Brushless Permanent Magnet Motors". Fogler Library, University of Maine, 2009. http://www.library.umaine.edu/theses/pdf/MartinBC2009.pdf.

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46

Brotman, Susan Rose. "The Evaluation of Device Model Dependence in the Design of a High-Frequency, Analog, CMOS Transconductance-C Filter". PDXScholar, 1994. https://pdxscholar.library.pdx.edu/open_access_etds/4701.

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It is important to have the ability to predict the effects of device model variation when designing integrated transconductance-C type active filters. Applying these filters to integrated circuit design has become increasingly popular due to its ease of implementation in monolithic form. With the introduction of fully automated design tools, predictable behavior of high-level variables becomes still more important. The purpose of this study is to evaluate the process parameter spread of analog device models to determine the effect on the design parameters of an active filter. This information's significant contribution directly effects the feasibility and realization of automating analog filter design. In order to explore the dependence of filter performance on the device v model parameter spread, a fifth-order inverse Chebyshev filter is designed and simulated using a two year history of process models. It has not been observed that higher order filters have been successfully designed using fully automated design tools. This filter was realized using automated filter design currently being developed in parallel with this study. A single-ended input to single-ended output transconductance amplifier is chosen for this design for its simplicity and small size. Differential performance is easily adapted with exact duplication which is demonstrated in the measurements of the fabricated filter. Simulation of the design is performed using MOSIS SCNA device parameters. Filter performance data such as cutoff frequency, stopband attenuation, and phase response is collected. Experimental results from the fabricated device are compared to simulation and the original prototype. 2 It is shown that the most predicable effect on the design parameters of a filter is caused by the parasitic output conductance parameter g0. This process dependent variable causes both a deviation in the cutoff frequency, and a decrease in the filter quality factor. In addition, it is also shown that the practice employed to predistort for absorption of parasitic capacitors in a MOS technology is a very effective tool in the reduction of capacitive process dependence.n software
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47

Lee, Jong-Nyun. "Design sensitivity analysis of multibody systems with special reference to four-wheel steering". Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/185963.

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Sensitivity analysis methods are investigated for the optimal design of multibody systems. In order to overcome the shortcomings inherent in existing methods, a "mixed" method is developed. The beneficial features of the finite difference and the direct differentiation methods, and equations of motion in the joint coordinates are employed in this method. As a realistic application of the sensitivity analysis, a Four-Wheel-Steering vehicle with complete suspension systems and comprehensive analytical tire model is implemented. This model keeps full nonlinearity in the governing equations of motion for accuracy, and it is simulated using an existing general-purpose multibody dynamics simulation package. However, by using the transient dynamic analysis of the nonlinear model, optimal design parameters are dependent on driving scenarios. Therefore, the transient behavior of the system is represented by a series of steady state configurations. Hence, a steady state analysis procedure which finds a steady state configuration from an arbitrary initial condition is developed. By using the steady state analysis and the sensitivity analysis, the optimal steering ratios between the angles of the front and the rear wheels are obtained over various driving conditions. A steering control strategy is developed for the vehicle simulation to follow a prescribed path. Finally, the simulation results using the optimal steering ratio are compared against the results of the conventional two-wheel steering and the steering ratio based on the linear bicycle model.
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48

Hayes, Monty Bradford. "Design and fabrication of planar inductors for inductive proximity sensors". Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-02132009-172614/.

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49

劉心雄 y Sum-hung Lau. "Adaptive FEM preprocessing for electro magnetic field analysis of electric machines". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31212451.

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50

Hezar, Rahmi. "Oversampled digital filters : a design methodology and implementation". Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/14936.

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