Rozprawy doktorskie na temat „Automotive Engineering”
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Fang, Xitian 1963, i Deming 1967 Wan. "Integrated automotive exhaust engineering : uncertainty management". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/34631.
Pełny tekst źródłaIncludes bibliographical references (p. 104-108).
The global automotive industry has entered a stagnating period. Automotive OEMs and their tier suppliers are struggling for business growth. One of the most important strategies is to improve the engineering efficiency in the product development process. The engineering uncertainties have been identified as the main obstacles in the Lean Engineering practices. This study will be focused on the engineering development process of ArvinMeritor Emission Technologies. The lean engineering principles and techniques are applied to the current product development process. The Value Stream Mapping and Analysis method is used to identify the information flow inside the current engineering process. Based on the value stream map, the uncertainties at various development stages in the process are identified. The Design Structure Matrix is used to identify any unplanned design iteration, which results in lower engineering efficiency. The House of Quality is used to prioritize the importance of the iterations. The suggested excel program can effectively evaluate the effect of task duration, probability, impact and learning curve assumption.
(cont.) In order to quantitatively predict the effects of the uncertainties, a System Dynamic model is specifically developed for the current engineering of Emission Technologies. The results clearly indicate the control factors for on-time delivery, efficient resource allocation, and cost reduction. This study has integrated the techniques from system engineering, system project management, and system dynamics. An improved automotive exhaust engineering process is proposed.
by Xitian Fang and Deming Wan.
S.M.
Haugen, Petter. "Automotive Energy Harvesting". Thesis, Mittuniversitetet, Institutionen för elektronikkonstruktion, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-37606.
Pełny tekst źródłaGrohol, Corbin Michael. "Toward Fixtureless Inspection of Automotive Fenders". Thesis, The University of North Carolina at Charlotte, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=13421638.
Pełny tekst źródłaWith nonrigid parts, it is most convenient for designers to specify the desired shape in the design condition; that is, the shape is specified with all loads present that the part will experience in service (gravity, assembly constraints, etc.). The flexibility of the part begins to pose challenges for the dimensional inspection of the part profile when the deformations due to design loads exceed 10% of the dimensional tolerances. A common approach to negotiate the inspection of nonrigid parts is to construct an inspection fixture that mimics the design condition (identical mounting points and orientation to gravity). Although effective, inspection fixtures have the limitation of cost, calibration maintenance, procurement time, and the inspection is limited to a small subset of parts. This thesis builds on the fixtureless inspection literature which has emerged in response to these limitations.
The proposed fixtureless inspection method uses finite element simulations to adjust the nominal design shape into the fixtureless measurement condition. Finite element simulations are used to remove deformations from the nominal shape due to design condition loads and add deformations due to measurement condition loads. In this way, the part can be inspected under different constraints than the design condition and without specialized fixtures. The details of the method are outlined including the finite element simulations (using Abaqus), conditioning of the finite element mesh (using MATLAB®), optical point cloud acquisition (using a ROMER Absolute Arm with integrated scanner), and the processing of the point cloud data (using MATLAB ®).
This method is first demonstrated on a cantilevered flat plate where the design condition is defined with a mass hanging on the end and the measurement condition is defined under the influence of gravity only. The proposed method is used to measure the profile deviation of the plate in the measurement condition (gravity only). For validation, the profile deviation is also measured in the design condition (mass hanging on the end). The profile deviation from the measurement condition is shown to match the directly measured profile deviation from the design condition to within 25 µm. This is two orders of magnitude lower than the 3 mm design condition deflections of the cantilevered plate.
The method is extended to an automotive fender where an original modal decomposition technique is used to deform the nominal model to the measurement data. The modal decomposition compensates for deformation of the part during assembly and provides a means to predict the required assembly forces. The profile deviation is measured using the proposed method with the fender in a fixtureless state resting on a flat table. For validation, the profile deviation of the fender is also measured in a specialized fixture to hold the fender in the design condition. The two profile deviations match within 0.6 mm, more than an order of magnitude lower than the 10 mm measurement condition deflections of the fender. This thesis provides one of the first automotive examples of fixtureless inspection and offers improved computational efficiency as finite element simulations for every measured part are not required.
Fröberg, Joakim. "Engineering Automotive Electronic Systems: Decision Support for Successful Integration". Doctoral thesis, Mälardalen University, Department of Computer Science and Electronics, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-459.
Pełny tekst źródłaThe electronic system of a modern vehicle is essential to achieve a successful automotive product. Vehicle development is performed by integrating components that include embedded electronics from several suppliers.
This thesis present results on the subject of integration of automotive electronic systems. Our studies aim at providing knowledge on how to integrate automotive electronic systems successfully in a setting where vehicles are developed based on existing platforms. We focus on early phases of automotive electronic system development and in particular on the decisions taken in integration of electronic sub-systems. The contribution is the presented support for making decisions to successfully integrate electronic systems for modern vehicles. The contribution includes an overview of driving factors of automotive electronics system design, a validated set of success practices for the integration of electronic components, and the proposal and demonstration of a decision model. The influential factors and the validated set of practices stems from case studies of products and projects while the proposed decision model is a result of combining two general models for architecture analysis and decision making, ATAM and AHP.
We demonstrate that choices in strategy and design preceding integration are central to achieve a successful integration. Our studies show that problems arise from omitted strategy decisions and we provide a checklist for decision making in the areas; functionality, platform, integration design, and assigning responsibilities. We provide a recommendation that we validate in a multiple cases study where fulfillment of recommendations is demonstrated to affect project success in integration projects.
The potential gain for OEMs using our results lies in achieving more solid foundations for design decisions. Designers and managers could potentially find central decisions on integration strategy early that, if omitted, could cause delays. Thus, applying the result could avoid pitfalls and enable successful integration projects.
Chen, De-Shiou. "Sliding mode observers for automotive alternator". The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1384448652.
Pełny tekst źródłaBulusu, Vinod, i Haekyun Kim. "Improving automotive battery sales forecast". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99806.
Pełny tekst źródłaCataloged from PDF version of thesis.
Includes bibliographical references (pages 54-55).
Improvement in sales forecasting allows firms not only to respond quickly to customers' needs but also to reduce inventory costs, ultimately increasing their profits. Sales forecasts have been studied extensively to improve their accuracy in many different fields. However, for automotive batteries, it is very difficult to develop a highly accurate forecast model because many variables need to be considered and their correlations are complex. Additionally, current sales forecasts are derived from historical data and thus do not include any other causal factor analysis. In this study we applied causal factor analysis to determine how the forecast accuracy could be improved. We focused on understanding the relationship between temperature and sales. Using regression modelling, we found that there is a quadratic relationship between temperature and battery sales. We validated the model by comparing the actual and predicted sales for various geographies and times. We concluded that the model is more robust for predicting sales across various times than through various geographies.
by Vinod Bulusu and Haekyun Kim.
M. Eng. in Logistics
Fussey, Peter Michael. "Automotive combustion modelling and control". Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:ec66cbb1-407e-431c-bd77-e67bcf33be3a.
Pełny tekst źródłaBryant, Scott T. "User centred engineering in automotive design: A shift from technology-driven product development". Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/84793/1/Scott_Bryant_Thesis.pdf.
Pełny tekst źródłaRameez, Muhammad. "Interference Mitigation Techniques in FMCW Automotive Radars". Licentiate thesis, Blekinge Tekniska Högskola, Institutionen för matematik och naturvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-19362.
Pełny tekst źródłaGuerra, Zuimdie. "Evaporative air conditioner for automotive application". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/35980.
Pełny tekst źródłaYacinthe, Samuel. "System Safety Development of a Performance PHEV Through a Model-Based Systems Engineering Approach". The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469025640.
Pełny tekst źródłaAkdogan, Volkan. "Thermoelectric power generator for automotive applications". Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/37702/.
Pełny tekst źródłaAl, Qubeissi Mansour. "Heating and evaporation of automotive fuel droplets". Thesis, University of Brighton, 2015. https://research.brighton.ac.uk/en/studentTheses/540596d9-e14f-4007-9533-acd625e14b8e.
Pełny tekst źródłaStoddart, Evan. "Computer Vision Techniques for Automotive Perception Systems". The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555357244145006.
Pełny tekst źródłaHarper, Lee Thomas. "Discontinuous carbon fibre composites for automotive applications". Thesis, University of Nottingham, 2006. http://eprints.nottingham.ac.uk/10246/.
Pełny tekst źródłaZheng, Shuang. "Automotive Ethernet Gateway : Network Deployment on Layer 2". Thesis, KTH, Nätverk och systemteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-214615.
Pełny tekst źródłaDagens inbyggda nätverksteknologier i fordon blir alltmer en flaskhals på grund avotillräcklig bandbredd. Den ökade efterfrågan för bandbredd-intensiva applikationer medfunktioner som autonom körning, navigation och infotainment har gjort att automotiveEthernet har börjat användas i större utsträckning. Tack vare moderna switchar och en nyuppsättning av IEEE standarder finns nu ett stöd för determinism, bandbreddsallokeringoch prioritering av meddelanden på en nivå som tidigare inte varit tillgänglig. Dock ställerkraven för tunga fordon likt bussar och lastbilar fortfarande en försiktigt samt noggrannnätverksdesign och en tillämpning ställt med hänsyn till säkerhet och robusthet.I den här tesen behandlas framtida tillämpningsfall samt utvärdering av olikakonfigurationsstrategier på layer-2 switchar genom simuleringar. Vi utvärderar effekten avantalet trafikklasser, och prestandan på stream reservation och traffic shaper. Målet är attundersöka hur nätverksprestandan påverkas av dem, och att hitta lösningen som leder tillbästa balansen för Quality of Service. Samtidigt har tid ägnats åt att förstå vilka funktionerswitcharna skall inkludera för att stödja konfigurationerna. Det slutliga resultatet avkonfigurationer tillsammans med funktioner i switcharna ämnar att agera som en riktlinjeför att automotive Ethernet i framtiden.
Maine, Elicia M. A. (Margaret Anne). "Future of polymers in automotive applications". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10509.
Pełny tekst źródłaMcLaughlin, Shannon. "An Alternative Refrigeration System For Automotive Applications". MSSTATE, 2005. http://sun.library.msstate.edu/ETD-db/theses/available/etd-05242005-115750/.
Pełny tekst źródłaMoskwa, John J. (John Joseph). "Automotive engine modeling for real time control". Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14617.
Pełny tekst źródłaDeo, Hrishikesh V. "Axiomatic design of customizable automotive suspension systems". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38698.
Pełny tekst źródłaIncludes bibliographical references (p. 195-201).
The design of existing suspension systems typically involves a compromise solution for the conflicting requirements of comfort and handling. For instance, cars need a soft suspension for better comfort, whereas a stiff suspension leads to better handling. Cars need high ground clearance on rough terrain, whereas a low center of gravity (CG) height is desired for swift cornering and dynamic stability at high speeds. It is advantageous to have low damping for low force transmission to vehicle frame, whereas high damping is desired for fast decay of oscillations. To eliminate these trade-offs, a novel design for a customizable automotive suspension system with independent control of stiffness, damping and ride-height is proposed in this thesis. This system is capable of providing the desired performance depending on user preference, vehicle speed, road conditions and maneuvering inputs. The design, fabrication and control of the customizable suspension prototype are discussed. The application of variable stiffness and variable ride-height suspension system to achieve improved vehicle dynamics is studied. Application to control of vehicle dynamics parameters required bandwidth and power input beyond the capability of the first prototype.
(cont.) To eliminate the bandwidth restrictions of the prototype, a variable-stiffness pneumatic suspension system capable of instantaneous stiffness change with essentially no power input and no ride-height change, is developed. This is done by supporting the vehicle on air springs and connecting each air spring volume to multiple auxiliary volumes through On-Off valves. By adequately choosing N unequal auxiliary volumes, this system can achieve 2N stiffness settings. This suspension has been incorporated in a car suspension. The design, fabrication, and testing of the suspension system are reported in this thesis. A detailed frequency-domain model for the air-spring with auxiliary volumes is developed. Based on this modeling and testing, the performance limits and practical applicability of this system are discussed. The proposed variable stiffness isolator is capable of instantaneous stiffness change with no power input and no dimension change; moreover the isolator is inexpensive, robust and light. As a result, it is readily applicable to several other vibration isolation applications with conflicting stiffness requirements (such as a precision motion stages) or time-varying stiffness requirements (such as prosthetic limbs) and these applications are discussed.
by Hrishikesh V. Deo.
Ph.D.
Cho, Dong-Il. "Nonlinear control methods for automotive powertrain systems". Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14682.
Pełny tekst źródłaJunior, Valter Sequero Prieto. "Projetos automotivos: proposta para redução de tempo de desenvolvimento". Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/3/3149/tde-25042003-080641/.
Pełny tekst źródłaThe present volume is destined to summarize the development process of automobiles, showing the many items responsible for speed up this development, and make a proposal for a thinking basis to shorten development time.
Saman, Muhamad Zameri Mat. "Methodology of design for end of life value in automotive engineering". Thesis, Coventry University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421203.
Pełny tekst źródłaMangin, Christophe G. E. "Advanced engineering materials for automotive engine components : cost and performance estimations". Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12742.
Pełny tekst źródłaIncludes bibliographical references (v. 2, leaves 369-375).
by Christophe G.E. Mangin.
Ph.D.
Gena, Kriti. "Suitability of Model Based Systems Engineering for Agile Automotive Product Development". The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595500667122794.
Pełny tekst źródłaCarballo, Roberto R. "Tribological study of PS-23 for possible automotive applications". FIU Digital Commons, 1996. http://digitalcommons.fiu.edu/etd/2041.
Pełny tekst źródłaPereira, Fernando Domingues. "Desenvolvimento e validação experimental de modelo para cálculo e análise de confiabilidade do esforço de fechamento de portas automotivas". Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3151/tde-07072016-142720/.
Pełny tekst źródłaThe Brazilian automotive industry is known by its great influence on the country economy, similar to several other countries. It is important to highlight the door assembly importance on the vehicle concept, as it is the first contact made to the customer. The vehicle ingress is through the side access area, established by the doors and a high door closing effort may lead to a wrong impression. The door closing effort or also known as door closing energy is an extreme importance asset, as well as influencing the image of the vehicle and the brand, it is an item of ergonomics and vehicle comfort. The automotive door closing event starts at the moment door is open and pushed to close itself. This event is math modeled and implemented as an excel dynamic calculation plan, considering as input the vehicle and components specific data, its output is the door closing effort and each components portion. It is presented a series of values so the model is considered valid. This work also presents a reliability study defining a range of experimental values for the door closing effort based on tolerances of components used in the model calculations. The characteristic curve which is one of the parameters of the model output is extremely close to the measurement performed in the laboratory. With the completion of the model is possible to estimate the energy loss due to the life of certain components such as latches and weatherstrips, and the influence of using self-lubricating over molding in the latch. This study contributes to the Product Engineering professionals in the areas of Body, Mechanisms and Body Closures, with the elaboration of a calculation tool for use in any design phase, but mostly serving to estimate the door closing effort at the moment of conception until the validation of prototype vehicles.
Bahrieh, Sara. "Sensor Central / Automotive Systems". Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-6012.
Pełny tekst źródławww.baselabs.de
Blume, Russell Dale. "Modeling and optimization of solar-control automotive glasses". The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1301934060.
Pełny tekst źródłaGribble, Nicholas R. "Alcohols and other oxygenates in automotive fuels". Thesis, Aston University, 1987. http://publications.aston.ac.uk/10184/.
Pełny tekst źródłaHosking, Niamh C. "Next generation corrosion protection for the automotive industry". Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/14514/.
Pełny tekst źródłaMaul, Christian. "Intermittent electrical discontinuities in tin-plated automotive contacts". Thesis, University of Southampton, 2001. https://eprints.soton.ac.uk/47622/.
Pełny tekst źródłaLöwen, Wilhelm, i Louise Törnsten. "Disruptions in the automotive manufacturing ecosystem". Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264121.
Pełny tekst źródłaIndustry 4.0 som medför uppkoppling gör att biltillverkningsindustrin står inför fler förändringar någonsin. När mer tillverkningsutrustning blir uppkopplad kan man integrera utrustningen med varandra, vilket tillåter dem att förbättra varandra och därigenom förbättra prestandan av all sammanlagd utrustning. Fokus inom utveckling av produkter och affärsstrategier skiftar från utveckling av enskilda tillverkningsutrustningar till utrustningens roll i hela systemet. Bilindustrin uttrycker dock en osäkerhet inför hur tillverkningsekosystemet förändras. Av denna anledning är syftet med denna studie att hitta en genomförbar affärsstrategi för en leverantör av tillverkningsutrustning till bilindustrin. För att kunna uppfylla syftet med studien har data samlats in via tre olika metoder; en förstudie, en literaturstudie och en empirisk studie. Förstudien var nödvändig för att förstå fallstudieföretagets nuvarande situation och utmaningar. Literaturstudien identifierade tidigare känd forsking i bilindustrins tillverkningsekosystem såväl som teoretiskt ramverk för affärsstrategier. En empirisk studie genomfördes för där 16 intervjuer hos nio av de största kunderna och leverantörerna inom biltillverkningsindustrin i Sverige gjordes för att utforska möjliga framtida strukturer av tillverkningsekosystemet. Det finns två möjliga framtida strukturer av ekosystemet men en av dem är mer trolig och dessutom mer gynnsam för leverantörer av tillverkningsutrustning. Affärsstrategin som har hittats för en leverantör av tillverknings-utrustning innebär att ta en större roll och ett större ansvar i ekosystemet och därmed bli en komplett lösningsleverantör. Den viktigaste innebörden av denna affärsstategi är att relationen mellan leverantör och kund måste bli närmare för att levarantören ska förstå hur deras produkter bidrar till ekosystemet och hur de kan tillämpa deras kunskap om deras egna processer för att förbättra det. Leverantörer av tillverkningsutrustning bör dock redan nu börja arbeta mot denna strategi för att försäkra sig om att de kan påverka utvecklingen av ekosystemet till den mest gynnsamma för dem.
Nazir, Mahvish. "Automotive radar target detection using ambiguity function". Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6842/.
Pełny tekst źródłaSheikhi, Abdolreza. "Laser shadowgraph study of early flame propagation in swirling flows near the lean misfire limit". Thesis, University of Ottawa (Canada), 1995. http://hdl.handle.net/10393/9577.
Pełny tekst źródłaChen, Titus S. "Auto-ignition of liquid droplets of single and two component fuels under pressure". Thesis, University of Ottawa (Canada), 1995. http://hdl.handle.net/10393/10171.
Pełny tekst źródłaVarnhagen, Scott Julian. "Development of Vehicle Dynamics Control for Wheel-Motored Vehicles". Thesis, University of California, Davis, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3685305.
Pełny tekst źródłaThis dissertation describes a methodology for the vehicle dynamics control of a wheel motored vehicle. All theory is developed assuming that the driver has control of the front wheel steering angle, and that wheel torque is solely generated by independent wheel motors at each corner of the vehicle. Theoretical work is presented for the general case with four independent wheel motors, but can be easily reduced to a situation with only two wheel motors. Indeed, all theory developed in this work is evaluated experimentally on a production automobile converted to be driven by two independent rear wheel motors.
As opposed to directly allocating wheel torques, the proposed philosophy operates in the slip-ratio domain. Doing so helps to prevent excessive tire saturation and allows the system to adapt to changing road surfaces. To that end, this dissertation first proposes a method of estimating slip-ratio utilizing only sensors currently available on modern automobiles. A slip-ratio controller is then developed approximating the disturbance observer structure. This allows the controller to be robust to changing road surface and as a byproduct provide an accurate estimate of longitudinal tire force. Combining the estimated longitudinal tire force with the estimated slip-ratio it is then possible to ascertain some degree of tire saturation. With this in mind, an optimal control allocation problem is proposed which attempts to achieve the desired vehicle dynamics while at the same time minimizing tire saturation.
It is shown experimentally that the proposed control methodology effectively achieves desired vehicle dynamics. In addition, the system adapts its behavior to changing road surfaces resulting in optimal performance regardless of operating conditions.
Chopra, Vikram. "Design of innovative clutching mechanisms for hybrid automotive transmissions". Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=123009.
Pełny tekst źródłaDans cette thèse sont étudiés des mécanismes innovants d'embrayage pour transmissions automobiles hybrides qui n'engendrent que de faibles pertes, tout en satisfaisant les besoins parfois conflictives de compacité, de haute vitesse de réaction et de haute densité d'énergie. Une approche systématique de la conception de transmissions automobiles est proposée, dont l'objectif est d'offrir un outil complémentaire au jugement du concepteur. Les divers alternatives choisises servent à présenter les concepts fondamentaux, ainsi qu'à mettre en valeur les différentes approches et solutions à des problèmes spécifiques qui ont une application directe dans le domaine des conceptions de transmissions. L'analyse d'alternatives de conception va suffisamment en profondeur pour être utile à la fois aux ingénieurs de conception automobile et aux théoriciens.Le phénomène de pertes d'énergie cinétique de rotation (PECR) est bien connu dans l'industrie automobile, car cela affecte toutes les transmissions. Un puits d'énergie mis en évidence à ce propos concerne les embrayages et freins traditionnels à fluides, pour lesquels un embrayage ouvert ou un frein ouvert, crée une traînée dans la transmission parce que l'huile tourbillonne autour et dans les plaques tournantes de friction. Un second puits d'énergie est d'origine électromagnétique, car générée par la rotation de moteurs inactifs contenant des aimants permanents. Hormis le PECR, l'actionnement hydraulique d'embrayages ou de freins entraîne des pertes de charges. Les joints, pompes et valves encourent des fuites qui engendrent de puits d'énergie.En utilisant les techniques mises en avant dans cette thèse, deux nouvelles alternatives d'embrayages démontrent leurs capacités à améliorer les technologies des freins et des embrayages. L'une de ces alternatives, l'actionneur {\em électromécanique d'embrayage}, est basée sur une liaison à vis et dispose d'un mécanisme intégré de verrouillage. La liaison à vis a été testée au travers de deux sous-alternatives, à savoir une vis à filet trapézoïdal et une vis à billes. Un prototype de chacune des alternatives a été installé sur un banc d'essai, afin de reproduire l'installation de l'actionneur en lieu et place des composants hydrauliques correspondants. Pour mieux refléter le comportement élastostatique de l'assemblage des disques d'embrayage, un nouveau modèle de sa raideur, assimilée à un ressort durcissant, a été formulé. Des tests de preuve de concept des deux variantes, vis à filet trapézoïdal et vis à billes, ont montré leur faisabilité.La seconde variante, l'embrayage électromagnétique à interférence, est directement utilisable pour minimiser les pertes en rotation et en actionnement hydraulique pour les moteurs électriques à embrayage, pour lesquels un moteur est connecté à un embrayage. Le système inclut un unique synchronisateur et des bagues de synchronisation avec des dents-de-chien sur les composants en entrée et en sortie. Le travail de conception a été concentré sur la partie électromagnétique, qui essaie de réduire le glissement de l'embrayage et le couple de commande. Le nouveau système conception est doté d'un stator en forme de griffes et des pôles de rotor saillants faciles à usiner et à installer dans un espace restreint dans la voiture. Une étude complète de conception avec des tests concrets de preuve de concept a été accomplie.Rééduire le PECR dans les assemblages de transmissions améliorera l'efficience du système et mènera à davantage d'économie de carburant. L'impact technologique sera ainsi bénéfique non seulement pour l'utilisateur, qui profitera d'un kilométrage plus élevé pour son argent, mais aussi pour l'environnement.
Zhou, Xianjie. "Formulation of an interactive ruled-based design envelope for ensuring aftermarket vehicle dynamics compliance". Thesis, Clemson University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10246430.
Pełny tekst źródłaThe objective of this research is to develop an integrated system engineering methodology for the customization design to maximize vehicle performance upgrade freedom while ensuring vehicle dynamics compliance.
A post-delivery modification framework, which is led by an aftermarket umbrella organization and involve various stakeholders has been established. The umbrella organization will be in charge of developing the design envelope and distribute to various aftermarket kit suppliers to generate specific products according to their brand essence.
A generic mathematical representation of a (proprietary) ESC system has been developed for virtual certification purposes. This approach is a cost-effective alternative to physical on-road testing and hardware-in-the-loop (HiL) simulations. Furthermore, based on the stability control model, the modification impacts on the vehicle dynamics and stability performance was assessed using the Taguchi design of experiment (DOE) method. DOE results provide three distinct ways for supporting aftermarket modifications. First, main effects help customizers to understand which modification bring benefits or risks. Second, a regression model of the lateral offset metrics helps suppliers to predict closed-loop performances with open-loop testing information which require much less time and cost. Finally, the pass/fail criteria regarding federally mandated ESC compliance (FMVSS 126) brought on the ‘Pass Region’ which consisted of feasible configurations such that customizers may configure their options within a safe zone. Each of these methods complements others for supporting the aftermarket modification.
In order to improve the computation efficiency, two lower fidelity models were developed: A linear model and a surrogate model. The linear model is derived from the high fidelity model with reduced degrees of freedom (DOF) and linearized parameters. Tire cornering stiffness is treated as constants for gentle maneuvers, and varying parameters for high-dynamic driving maneuver. The linear system is either a linear time-invariant (LTI) system or a linear parameter-varying (LPV) system depending on the application context. The PD yaw stability control algorithm, which is inherited from the high fidelity model, was simplified but retained with critical nonlinear features. A quadratic regression model that was dedicated for compliance metrics was developed as a surrogate model incorporated in an interactive rule-based design envelope.
An interactive design envelope has been created incorporating the rules established using computational efficient linear and surrogate models. The constraint satisfaction problem is described in the nonlinear programming context and solved using sequential quadratic programming. The quasiconvexity of the design space, which is the necessary condition for the proposed approach, is also investigated by inspecting the constraint functions. Finally, two case studies were developed to demonstrate the framework developed which was validated against the high fidelity co-simulation model.
Zhang, Quansheng. "Modeling, Energy Optimization and Control of Vapor Compression Refrigeration Systems for Automotive Applications". The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406121484.
Pełny tekst źródłaMack, James. "Calibration of Automotive Aftertreatment Models through Co-Simulation with MATLAB Optimization Routines". The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461176367.
Pełny tekst źródłaFonte, William Giacomo. "An automotive lower back seat system design". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/32140.
Pełny tekst źródłaHan, Helen N. (Helen Ning). "The competitive position of alternative automotive materials". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/12042.
Pełny tekst źródłaMoosavi, Khoonsari Elmira. "Reinforced aluminum structure castings for powertrain automotive applications". Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66990.
Pełny tekst źródłaLe renfort des pièces coulées en aluminium par l'assemblage d'insertions ferreuses (systèmes hybrides) permet de combiner la légèreté de l'aluminium avec la rigidité des alliages à base de fer. Cette technique présente donc un grand intérêt pour plusieurs applications, spécialement dans le secteur des transports. Ce projet porte sur les différents aspects technologiques de la coulée de pièces avec joint aluminium-fonte auquel est ajouté une couche intermédiaire (ou revêtement). La procédure expérimentale a consisté à préparer la surface des insertions, à appliquer le revêtement, puis immerger la pièce dans un bain d'aluminium liquide, pour finalement refroidir le système jusqu'à la température de la pièce. Les effets du traitement par flux, de la décarburisation, et des paramètres de revêtement ainsi que la durée d'immersion dans l'aluminium liquide sur la qualité du joint aluminium-fonte ont été étudiés. L'évolution de la microstructure par la formation d'une zone de réaction à l'interface de l'insertion de réaction et zone du revêtement a été déterminée en fonction de la composition du revêtement er du temps d'immersion dans le revêtement liquide, et leurs effets sur les propriétés du joint été évalués. La corrélation entre la microstructure et la microdureté du joint ont a été établie. La décarburisation, le traitement par flux, l'utilisation d'un revêtement approprié et l'optimisation des paramètres du procédé améliorent significativement les propriétés du joint. L'utilisation du revêtement "McGill 2" avec un temps d'immersion dans le bain d'aluminium d'une minute permet la formation d'un joint Al-Fe avec des caractéristiques morphologiques, d'épaisseur, de microdureté et de composition optimisées. Les résultats montrent que l'insertion de pièces formant un joint peut être utilisée pour renforcer les pièces d'aluminium et
Deshmukh, Suraj Sharadchandra 1978. "Field-responsive ('Smart') fluids for advanced automotive applications". Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/72801.
Pełny tekst źródłaIncludes bibliographical references (p. 122-129).
Energy management is of vital concern in the automotive industry and many components need to satisfy stringent 'impact-safe' requirements. These energy absorption requirements conflict with the design demands for more compliant, thinner materials leading to a conflict of stiffness problem. A 'novel' energy absorbing material that adapts to environmental conditions and user specifications has been conceptualized, designed, modeled and tested in the present work. This adaptive energy absorbing material consists of an elastomeric foam impregnated with a field-responsive fluid such as a magnetorheological fluid or a shear-thickening fluid. Stable and inexpensive magnetorheological (MR) fluids based on carbonyl iron powder have been synthesized in the laboratory. The rheological properties, including the field dependent yield-stress, of the fluid have been measured at magnetic fields varying from 0.0 to 0.4 Tesla using a custom-built fixture for the AR 2000/ 1000N rheometers. Steady shear rheological experiments and transient creep tests have also been performed on a shear-thickening fluid consisting of 56% w/w corn-starch in water. The large, reversible changes in the rheological behavior of field-responsive fluids have been utilized for controlling the stress-strain behavior and energy absorption characteristics of cellular solids. The mechanical properties of 'dry' and field-responsive fluid-impregnated cellular solids have been determined using Texture Analyzer modified with a custom-built attachment. Foams impregnated with MR fluids have shown a tremendous improvement in the energy-absorption capacity. The energy absorbed per unit volume at moderate magnetic fields (B ~/~ 0.2 T) has been found to increase by 30 to 50 times as compared to the energy absorbed at zero-field. A 'two-layer' scaling model has been proposed to explain the increase in the foam plateau stress based on an assumption that the MR fluid forms a secondary layer on the solid edges of the foam and determines the composite elastic modulus. Experiments have been carried out to determine the effect of control parameters such as the magnetic field, volume fraction of the fluid impregnating the foam and the strain rate on the mechanical behavior of the composite. The magnetic field has been varied from 0.0 to 0.2 T, the volume fraction from 0% to 60% and the strain rate from 0.02 to 2.0 s-1. All the experimental data has been found to collapse onto a single master curve using appropriate shift factors based on the proposed theoretical model. Impact testing using a 'drop-ball' test apparatus, built in-house, has been performed for a scaled down headrest model. Designs for an adaptive headrest and various automotive components have also been described in detail. The present work has thus presented a 'novel' class of conformable field-responsive fluid based composites that can be used for rapidly switching energy absorbing applications.
by Suraj Sharadchandra Deshmukh.
S.M.
Zhou, Yitong Zhou. "Mechanical Characterization of Automotive Electrical Wires and Wire Harnesses". The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469016576.
Pełny tekst źródłaAdedjouma, Morayo. "Requirements Engineering Process according to Automotive Standards in a Model-driven Framework". Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00724470.
Pełny tekst źródłaTruong, Hai The 1962. "Management framework of automotive full service supplier in computer aided engineering (CAE)". Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/91742.
Pełny tekst źródłaPenney, John 1974. "Managing the implementation of automotive emission control technologies using systems engineering principles". Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/34737.
Pełny tekst źródłaIncludes bibliographical references (p. 79-80).
In the 1940s and 1950s poor air quality in major metropolitan areas throughout the United States started to negatively influence the health of citizens throughout the country. After numerous studies the government concluded that mobile sources of air pollution were a significant contributor to the deteriorating air quality. From that point onwards, the automobile manufacturers have been forced to comply with ever tightening emission regulations. This thesis describes an original investigation into the conflicting clockspeeds that prohibit rapid integration of new automobile emission technologies into production automobiles. Common themes and barriers to technology implementation are uncovered by systematically analyzing current production emission technology and exhaust gas after-treatment systems, and investigating how those systems have evolved over the years. A heuristic for analyzing the technology clockspeed is developed by decomposing the problem into four interconnected cycles. These four cycles correspond to the government's process to develop new automobile emission control regulations and the automobile manufacturer's ability to engineer and certify vehicle platforms, engines, and combustion after-treatment systems. This thesis analyzes the emission control technology development process in six chapters. The first chapter deals with setting the scope and defining the boundaries of the systems that will be analyzed. Chapter two analyzes the driving forces behind the creation of emission regulations and the legislative processes that transform ideas into law. Chapter three analyzes the second level decomposition of the problem at the vehicle level with a specific emphasis on Ford Motor Company's Fox vehicle platform.
(cont.) The fourth chapter decomposes the problem to the engine system level with a focus on the production history of American V8 engines. Chapter five investigates the management of a catalytic converter development program and recommends an organizational structure to efficiently develop catalytic converter systems. The organizational structure recommendation is based on results obtained from a task oriented design structure matrix and a system engineering decomposition.
by John Penney.
S.M.
Ollier, Jenny-Louise. "Computer aided engineering methodology for the durability assurance of welded automotive components". Thesis, Swansea University, 2008. https://cronfa.swan.ac.uk/Record/cronfa42895.
Pełny tekst źródła