Dissertations / Theses: 'Bureau of Motor Vehicles'

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Ngan, Shing-kwong. "Comparison of electric vehicles, hybrid vehicles & LPG vehicles /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21301384.

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Tsui, Bing-cheung. "LPG vehicles : will they replace small diesel vehicles in Hong Kong? /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19946041.

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Quelhas, Maria Inês Benedito. "Motor tariff for "others vehicles"." Master's thesis, Instituto Superior de Economia e Gestão, 2017. http://hdl.handle.net/10400.5/14484.

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Mestrado em Actuarial Science
Sob a competição crescente do mercado segurador, as companhias de seguros procuram formas de aumentar o seu lucro, apresentando ainda assim prémios competitivos e sem incorrer em riscos substanciais. Com este objetivo, novas técnicas de tarifação têm sido empregues e tarifas atualizadas têm sido desenvolvidas. Este trabalho resulta de um estágio curricular no departamento de Pricing and Business Analytics da Ocidental Seguros. O objetivo deste estágio foi criar uma tarifa de responsabilidade civil automóvel para "outros veículos" (motociclos, camiões, autocarros, tratores, atrelados e outros). Usámos dados provenientes de duas companhias de seguros, a Ocidental e a Ageas, com o objetivo de criar uma tarifa técnica única para ambas. Considerámos diversos fatores de risco que pudessem explicar o comportamento dos condutores com o objetivo de modelizar a frequência e o custo médio dos sinistros usando Modelos Lineares Generalizados e combinámo-los num modelo de prémio puro.
Under the increasing competition in the insurance market, insurance companies look for ways to increase their profit while still presenting competitive premiums and not incurring in substantial risks. In order to achieve this, new ratemaking techniques are being employed, and updated tariffs are being developed. This work results from a curricular internship in the Pricing and Business Analytics department of Ocidental Seguros. The goal of this internship was to create a third-party motor tariff for "other vehicles" (motorcycles, trucks, buses, tractors, trailers and others). We have used data from two insurance companies, Ocidental and Ageas, in order to create a unique technical tariff for them. We have considered several risk factors that could explain the drivers' behaviour in order to model the claims' frequency and severity using Generalized Linear Models and combined them into a pure premium model.
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Au, Yeung Ching-cheong Stephen. "Local policies and the environment a study on vehicle pollution /." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B3847735X.

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Chan, Sau-ha. "Tradeoff between internal combustion engined vehicles and electric vehicles in Hong Kong /." Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B17092267.

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Wilson, Robert L. "Design and validation of a chassis dynamometer for present and future vehicle testing and design." Ohio : Ohio University, 2002. http://www.ohiolink.edu/etd/view.cgi?ohiou1175009677.

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Ngan, Shing-kwong, and 顔成廣. "Comparison of electric vehicles, hybrid vehicles & LPG vehicles." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31254354.

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De, Oliveira Joao Pedro Damasio Simoes. "Simulation of child pedestrian collisions with motor vehicles." Thesis, University of Birmingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422302.

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Tsui, Bing-cheung, and 徐秉璋. "LPG vehicles: will they replace small diesel vehicles in Hong Kong?" Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31254123.

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West, Sarah Elizabeth. "Public finance solutions to vehicle emissions problems /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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Peterson, Jeremy. "Directional control of a tracked machine utilizing a dual-path hydrostatic transmission /." free to MU campus, to others for purchase, 2003. http://wwwlib.umi.com/cr/mo/fullcit?p1418057.

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Cairns, Robert Stuart. "Lateral aerodynamic characteristics of motor vehicles in transient crosswinds." Thesis, Cranfield University, 1994. http://hdl.handle.net/1826/2507.

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Motor car crosswind stability can be adversely affected by reductions in both vehicle mass and drag coefficient. As these are two likely results of future developments the importance of research into vehicle aerodynamic stability is set to increase, moreover, there is evidence that transient effects will be the critical. An experimental facility has been designed and constructed and tests have been carried out to investigate the implications of simulating dynamic flow-fields. Vehicle models of approximately 1/6th scale have been propelled along a test track, in the laboratory, to pass through a simulated crosswind gust of variable resultant yaw angle. Force and moment measurements have shown the aerodynamic inputs to be highly repeatable, though the technique has been restricted somewhat by the presence of mechanical "noise". Additional dynamic yaw experiments were conducted on a bluff-body model mounted in the College of Aeronautics' Oscillatory Facility. In some ways this technique is not as realistic as the Crosswind Track in its simulation of the full scale flow, however, despite its simplicity valuable aerodynamic data was derived from this test. Quasi-static tests have also been conducted and demonstrate that for certain model configurations a clearly defined yaw angle range exists where two different wake flow-structures are possible. At any given yaw angle, the dominant structure is determined by the flowfield history - essentially the direction in which the model is moved. This causes hysteresis in the forces and moments generated. In such a situation the flow is referred to as being bi¬stable. Both track and dynamic yaw tests indicate that the bi-stable flow phenomenon, witnessed in quasi-static experiments, can influence the dynamic forces and moments measured on a model. The flow structures associated with bi-stability are viscous-dominated and the slow development of viscous loads can be an important feature. It is possible that various vehicle configurations could induce bi-stable flow. If such flow behaviour is apparent then quasi-static forces and moment measurements will not provide an adequate engineering estimate of the transient aerodynamic loads. In this event it is imperative that the automotive engineer conducts investigations into the vehicle's dynamic performance.

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Zhang, Ruoju, and 張若菊. "A new PM hybrid motor drive for electric vehicles." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31472849.

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Singh, Rakesh Bhushan. "Modelling and measurement of particulate pollution from motor vehicles." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389355.

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Rind, S. J. "Speed sensorless induction motor drive control for electric vehicles." Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3008062/.

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Fast diminishing fossil fuel resources, deterioration in air quality and concerns for environmental protection, continuously promote the interest in the research and development of Alternative Energy Vehicles (AEVs). Traction motor drive is an integral part and common electric propulsion system in all kinds of AEVs. It plays an utmost significant role in the development of electrified transport industry. Application of Induction Motor (IM) drive is not only limited to the domestic and industrial applications but also has an ubiquitous influence in the modern electrified transport sector. IM is characterized by a simple and rugged structure, operational reliability, low maintenance, low cost, ability to operate in a hostile environment and high dynamic performance. However, IM is one of the widely accepted choices by Electric Vehicles (EVs) manufacturer. At present, Variable speed IM drive is almost replacing the traditional DC motor drive in a wide range of applications including EVs where a fast dynamic response is required. It became possible after the technological advancement and development in the field of power switching devices, digital signal processing and recently intelligent control systems have led to great improvements in the dynamic performance of traction drives. Speed Sensorless control strategies offer better system’s reliability and robustness and reduce the drive cost, size and maintenance requirements. Sensorless IM drives have been applied on medium and high speed applications successfully. However, instability at low speed and under different load disturbance conditions are still a critical problem in this research field and has not been robustly achieved. Some application such as traction drives and cranes are required to maintain the desired level of torque down to low speed levels with uncertain load torque disturbance conditions. Speed and torque control is more important particularly in motor-in-wheel traction drive train configuration EVs where vehicle wheel rim is directly connected to the motor shaft to control the speed and torque. The main purpose of this research is to improve the dynamic performance of conventional proportional-integral controller based model reference adaptive system (PI-MRAS) speed observer by using several speed profiles under different load torque disturbance conditions, which is uncertain during the whole vehicle operation apart from the vehicle own load. Since, vehicle has to face different road conditions and aerodynamic effects which continuously change the net load torque effect on the traction drive. This thesis proposes different novel methods based on the fuzzy logic control (FLC) and sliding mode control (SMC) with rotor flux MRAS. Numerous simulations and experimental tests designed with respect to the EV operation are carried out to investigate the speed estimation performance of the proposed schemes and compared with the PI-MRAS speed observer. For simulation and experimental purpose, Matlab-Simulink environment and dSPACE DS-1104 controller board are used respectively. The results presented in this thesis show great performance improvements of the proposed schemes in speed estimation & load disturbance rejection capability and provide a suitable choice of speed sensoless IM drive control for EVs with cost effectiveness.

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Line, Christopher Leonard James. "Modelling and control of an automotive electromechanical brake /." Connect to thesis, 2007. http://eprints.unimelb.edu.au/archive/00003859.

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Daley, James Joseph. "Development of a heavy duty vehicle chassis dynamometer test route." Morgantown, W. Va. : [West Virginia University Libraries], 1998. http://etd.wvu.edu/templates/showETD.cfm?recnum=251.

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Thesis (M.S.)--West Virginia University, 1998.
Title from document title page. Document formatted into pages; contains viii, 59 p. : ill. (some col.) Includes abstract. Includes bibliographical references (p. 57-58).

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Zagorski, Scott Bradley. "Compatibility of ABS disc/drum brakes on class VIII vehicles with multiple trailers and their effects on jackknife stability /." Columbus, Ohio : Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1069788894.

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Madireddy, Madhava Rao. "Methods for reconstruction of transient emissions from heavy-duty vehicles." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5826.

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Thesis (Ph. D.)--West Virginia University, 2008.
Title from document title page. Document formatted into pages; contains xii, 117 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 104-117).

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Nennelli, Anjali Devi. "Simulation of heavy-duty hybrid electric vehicles." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=2259.

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Thesis (M.S.)--West Virginia University, 2001.
Title from document title page. Document formatted into pages; contains xvi, 112 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 85-87).

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Zeng, Xianwu. "Improving the energy density of hydraulic hybridvehicle (HHVs) and evaluating plug-in HHVs /." Connect to full text in OhioLINK ETD Center, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=toledo1239319863.

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Thesis (M.S.)--University of Toledo, 2009.
Typescript. "Submitted as partial fulfillment of the requirements for The Master of Science in Mechanical Engineering." "A thesis entitled"--at head of title. Bibliography: leaves 75-78.

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Lao, Yin, and 劉然. "Image matching of running vehicles." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B30278806.

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Hardman, Scott John. "Consumer adoption of fuel cell vehicles : lessons from historical innovations and early adopters of battery electric vehicles." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/7011/.

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Fuel cell vehicles (FCVs), are one possible solution to address transportation-related climate change, urban air pollution and fossil fuel resource depletion. To solve these issues they need to displace internal combustion engine vehicles (ICEVs), the aim of this thesis is to understand whether FCVs can achieve this. First case studies of successful historical innovations are explored. Second the consumer adoption of battery electric vehicles (BEVs) is studied in detail by using questionnaire surveys and in-depth interviews. Finally, consumer attitudes and perceptions towards FCVs are investigated by conducting in-depth interviews and a FCV trial. From all of these results this thesis finds that FCVs have fewer benefits as perceived by consumers compared to BEVs and ICEVs. This means that consumers may preferentially adopt BEVs and will not be attracted to FCVs. This thesis makes recommendations on how to improve the attributes of FCVs so that they have more benefits for consumers. These efforts would increase the likelihood of consumers adopting FCVs. However, this thesis suggests that the adoption of FCVs still looks unlikely and that fuel cell (FC) stakeholders should seek to concentrate their efforts towards applications of FCs that have viable market entry potential.

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Cheung, Wai-fun. "Identifying Hong Kong traffic composition and vehicle outputs for use in road noise modelling /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19945668.

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詹宜巨 and 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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Jiang, Shuzhong, and 姜淑忠. "An advanced pole-changing induction motor drive for electric vehicles." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31245407.

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Fraser, Grant. "Structure borne sound in motor-vehicles using statistical energy analysis." Thesis, Heriot-Watt University, 1998. http://hdl.handle.net/10399/1285.

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This Thesis is about the application of Statistical Energy Analysis (SEA) to the study of noise and vibration in motor vehicles. Methods for predicting the transmission of structural waves between body panels in motor cars are given. A complex joint technique based on the wave dynamic stiffness approach is discussed in detail. This technique can account for the complexities of the joint structures found in motor vehicles. Transmission of vibration energy between panels connected by a curved section of panel has been investigated using the complex joint modelling technique. Wave Intensity Analysis(WIA) and SEA were used to calculate the coupled panel vibration levels based on transmission coefficients calculated using the complex joint techniques. Energy Level Differences (ELDs) were measured for comparison with predicted results using laboratory models. SEA failed to accurately predict the ELDs except at low frequencies. However WIA was able to predicted the ELDs with reasonable accuracy using an existing expression for transmission at a panel corner joint. Two SEA models of a small passenger car have also been constructed. One assumes simpler joint configurations when calculating transmission coefficients and the other uses the complex joint technique. Panel ELDs were measured using a small passenger car. The SEA model using the complex joint method gives better agreement with measured ELDs than did the model using the simpler joints. saloon Sound Pressure Level (SPL) as a result of engine noise was measured. Both SEA models of the vehicle gave good agreement between measured and predicted Saloon SPL. A noise problem associated with exhaust misalignment is also investigated.

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Zhan, Yiju. "A high performance switched reluctance motor drive for electric vehicles /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19833945.

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Joelsson, Tanja. "Space and Sensibility : Young Men’s Risk-Taking with Motor Vehicles." Doctoral thesis, Linköpings universitet, Tema Genus, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-90724.

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In this ethnographic study of “Volvo greasers” [Volvoraggare] in a peri-urban community in Sweden, risk-taking practices with motor vehicles, such as speeding and drifting, are explored and analyzed in relation to age, gender, class and place. Young men’s risk-taking with motor vehicles regularly generates public debate as a traffic safety issue, often resulting in various policy suggestions, such as curfews or raising of the driving licence age. Seldom are these suggested solutions based on critical ethnographic research where intersections of age, gender, class and place are highlighted. The study is based on ethnographic fieldwork, that is, participant observation, and informal and formal interviews, with greaser men and women between the ages of 15 and 19, as well as formal interviews with pupils at the local high school and with youth centre staff in the local community. The study has two overarching aims. The first is empirical: to make visible an under-studied area of contemporary youth culture in Sweden – the (Volvo) greasers. In order to understand how the greasers’ risk-taking with vehicles is manifested, talked about and practised, the thesis critically engages with the contexts of the risk-taking practices and their effects at both the material and the discursive levels. The second aim is theoretical. Through contextualization as an analytical tool, a theoretical contribution of the thesis is the development of a situated concept of risk‐taking. The thesis illustrates how intersecting norms and conceptions around age, gender, class and place are practised at the local level, thus highlighting the social character of risk--‐taking practices. A central analytical notion is the greasers’ negotiation of place, developed through the concept of spatial boredom, which affects their construction of personhood and their social practices. In light of this, the thesis suggests that situated risk-taking with motor vehicles benefit from being formulated as violations, which furthers the understanding of young people’s risk-taking practices with motor vehicles and paves the way for more multi-faceted discussions in theory, as well as in practice and policy-making around traffic safety.
I denna etnografiska studie av "Volvoraggare" i ett stadsnära samhälle i Sverige undersöks risktagande praktiker med motorfordon, såsom fortkörning och sladdande, och analyseras i förhållande till ålder, kön, klass och plats. Unga mäns risktagande med motorfordon genererar ofta offentlig debatt som en trafiksäkerhetsfråga, vilket har resulterat i olika politiska förslag som t.ex. utegångsförbud eller höjning av körkortsåldern. Sällan är dessa föreslagna lösningar baserade på kritisk etnografisk forskning där intersektioner av ålder, kön, klass och plats studeras. Studien är baserad på etnografiskt fältarbete, det vill säga deltagande observation och informella och formella intervjuer med unga raggare, män och kvinnor, i åldern 15 till 19, samt intervjuer med elever från det lokala högstadiet och med personal på den lokala fritidsgården. Studien har två övergripande syften. Det första syftet med studien är empiriskt: att synliggöra ett understuderat område av samtida ungdomskultur i Sverige --‐ (Volvo) raggare. För att förstå hur raggarnas risktagande med fordon manifesteras, talas om och praktiseras, diskuterar avhandlingen kontexten för och effekterna av de risktagande praktikerna på materiell och diskursiv nivå. Det andra syftet är teoretiskt. Med hjälp av kontextualisering som ett analytiskt verktyg är ett av avhandlingens teoretiska bidrag en vidareutveckling av risktagande som ett situerat begrepp. Avhandlingen visar hur normer och föreställningar kring ålder, kön, klass och plats praktiseras på lokal nivå och belyser därmed de risktagande praktikernas sociala karaktär. Ett centralt analytiskt begrepp för att förstå raggarnas förhandling med plats är rumslig tristess, vilket påverkar deras konstruktion av personskap och deras sociala praktiker. Mot bakgrund av detta föreslår avhandlingen att situerat risktagande med motorfordon bör omformuleras som kränkningar, vilket ytterligare skulle utveckla förståelsen av ungdomars risktagande praktiker med motorfordon och bana väg för en mer mångfacetterad diskussion inom såväl teori som inom trafiksäkerhetspraktik och ‐politik.

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Kirwan, Kerry. "Alternative glazing for automotive vehicles : executive summary." Thesis, University of Warwick, 2002. http://wrap.warwick.ac.uk/2670/.

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The first approach utilises a thin film of acrylic that is moulded onto the outside of a polycarbonate substrate. It was found that the gate of the injection mould cavity must be of uniform cross section otherwise local shear heating can occur and melt the acrylic film. The injection gate must also be located entirely on one side of the mould cavity otherwise the film is punctured by the molten polycarbonate and free to float within the cavity. Any mixing of the two materials will lead to opaque components due the difference in the refractive indices. The film was found to improve the UV resistance of any component, acting as a protective buffer for the polycarbonate. A new variety of hardcoat was applied to film-backed samples to impart abrasion resistance and samples were found to outperform commercially available alternatives under recognised laboratory conditions. The film-backed samples also exhibited excellent impact resistance when impacted upon the film-face. However, similar components failed at extremely low energy levels when impacted from the non-film face because flaws in the acrylic film caused cracks to be initiated when the film was placed into tension. The level of adhesion between the film and the polycarbonate has been found to be critical and if the failure mechanism could be guaranteed, then intruder resistant glazing that could be broken from the inside in an emergency becomes a possibility. Such a product would address the identified consumer concern of being trapped in a vehicle. The second approach utilises simultaneous dual injection moulding (2K), which has previously only been used to manufacture coloured components. A successful feasibility study was undertaken to demonstrate the concept of producing transparent components via such a process. This showed that much greater control is required for transparent applications otherwise the skin and core materials mix and opaque components are produced. The generally accepted academic principles associated with the process have been shown to be too simplistic and cannot be relied upon to guarantee good results. The ratio of viscosities of the skin and core materials appear to be more dominant than previously thought and the relative injection speeds of the two materials has a direct influence upon interfacial mixing and haze generation. It was also found that haze could be avoided if the refractive indices of the skin and core material were matched to within ±0.002, but this is impractical. A third area of research examined the feasibility of introducing structured glass fibres weaves into transparent components to improve rigidity. The study resulted in the construction of a transparent glass fibre pre-preg that could be moulded onto the outer surface of polycarbonate components. Flexural tests revealed that a single layer of glass fibre increased the flexural modulus of test samples by a factor of 3, whilst transparency and clarity were retained. Two patents have been filed as a direct result of this work.

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Wan, Ah-wai Angie. "A policy analysis of the liquefied petroleum gas vehicles scheme in Hong Kong." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25138601.

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Simpson, Andrew G. "Parametric modelling of energy consumption in road vehicles /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe.pdf.

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Fomunung, Ignatius Wobyeba. "Predicting emissions rates for the Atlanta on-road light-duty vehicular fleet as a function of operating modes, control technologies, and engine charateristics." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/20834.

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Hayes, Adam Jason Otto. "A determination of motor vehicle activity factors for Atlanta, Georgia through fuel consumption analysis." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/26232.

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Chan, Sau-ha, and 陳秀霞. "Tradeoff between internal combustion engined vehicles and electric vehicles in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31253064.

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Güler, Duygu Yardımoğlu Bülent. "Dynamic Analysis Of Double Wishbone Suspension/." [s.l.]: [s.n.], 2006. http://library.iyte.edu.tr/tezler/master/makinamuh/T000523.pdf.

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Vaughan, Joshua Eric. "Use of Active and Semi-Active Control to Counter Vehicle Payload Variation." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5251.

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All vehicles have changing payloads that affect their dynamic response. Compared to passenger vehicles, heavy machinery have larger and more greatly varying payload masses, higher centers of mass, and encounter larger disturbances. These factors lead to significant increases in the amount of vibration experienced by heavy machinery operators. This fact, when coupled with the large amount of exposure time that a typical heavy machinery operator incurs, leads to much greater vibration dosage values for the heavy machinery operator. In addition, the heavy machinery operator faces equal or greater opportunity for accident. The chance of accident, along with the increased vibration dosage, leads to an operating condition with significant safety risks, both short and long term. It has been shown that payloads affect both the stability and vibration isolation properties of a vehicle. Large payloads reduce vehicle stability while increasing the amount of vibration transmitted to the operator. A method to compensate for these loading affects would prove to be a useful technique to increase the safety of the vehicle, both in terms of accident avoidance and long term health effects of vibration. This thesis provides such payload compensation techniques. Improved vehicle dynamics were accomplished with the use of both active and semi-active suspension control. The active systems used are optimal control based, and provided the greatest improvements in vehicle performance. An optimal controller designed around a nominal payload, however, proved insufficient for operation over the entire payload range due to too large peak actuator forces at low payloads. A multiple model approach was used to remedy this problem. Semi-active systems based on a Linear Quadratic Regulator with output feedback and damping selection via static deflection were developed. The semi-active systems would require far less power than the active systems, with the need for knowledge of fewer systems states. It was shown that despite these lower demands, the semi-active systems closely approach the performance of the fully active systems.

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Velenis, Efstathios. "Analysis and Control of High-Speed Wheeled Vehicles." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10476.

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In this work we reproduce driving techniques to mimic expert race drivers and obtain the open-loop control signals that may be used by auto-pilot agents driving autonomous ground wheeled vehicles. Race drivers operate their vehicles at the limits of the acceleration envelope. An accurate characterization of the acceleration capacity of the vehicle is required. Understanding and reproduction of such complex maneuvers also require a physics-based mathematical description of the vehicle dynamics. While most of the modeling issues of ground-vehicles/automobiles are already well established in the literature, lack of understanding of the physics associated with friction generation results in ad-hoc approaches to tire friction modeling. In this work we revisit this aspect of the overall vehicle modeling and develop a tire friction model that provides physical interpretation of the tire forces. The new model is free of those singularities at low vehicle speed and wheel angular rate that are inherent in the widely used empirical static models. In addition, the dynamic nature of the tire model proposed herein allows the study of dynamic effects such as transients and hysteresis. The trajectory-planning problem for an autonomous ground wheeled vehicle is formulated in an optimal control framework aiming to minimize the time of travel and maximize the use of the available acceleration capacity. The first approach to solve the optimal control problem is using numerical techniques. Numerical optimization allows incorporation of a vehicle model of high fidelity and generates realistic solutions. Such an optimization scheme provides an ideal platform to study the limit operation of the vehicle, which would not be possible via straightforward simulation. In this work we emphasize the importance of online applicability of the proposed methodologies. This underlines the need for optimal solutions that require little computational cost and are able to incorporate real, unpredictable environments. A semi-analytic methodology is developed to generate the optimal velocity profile for minimum time travel along a prescribed path. The semi-analytic nature ensures minimal computational cost while a receding horizon implementation allows application of the methodology in uncertain environments. Extensions to increase fidelity of the vehicle model are finally provided.

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Ng, Bing Benson. "Cleaner alternative fuels for vehicles a cleaner future for Hong Kong /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk:8888/cgi-bin/hkuto%5Ftoc%5Fpdf?B23426044.

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Khan, ABM Siddiqur Rahman. "Evaluating real-world idle emissions from heavy-duty vehicles." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4217.

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Thesis (M.S.)--West Virginia University, 2005.
Title from document title page. Document formatted into pages; contains xii, 58 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 55-58).

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鄭永權 and Wing-kuen Cheng. "The performance of biodiesel in in-service motor vehicles in HongKong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B26665335.

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Namdeo, Anil Kumar. "Modelling the emission and dispersion of air pollution from motor vehicles." Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294728.

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Braiwish, Nasser. "Design optimisation of brushless permanent magnet synchronous motor for electric vehicles." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/100265/.

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A novel new application of optimisation algorithm “Bess Algorithm” in the design of electric machine is presented in this thesis. The optimisation has the ability to perform global and local search and can be applied on constrained, unconstrained optimisation problem with multi-objective function, which all counted when consider optimisation algorithm for the design of electric machine. The searching procedure of the optimisation algorithm has been described in detailed. Furthermore, novel instructions and recommendation were implemented to tune the optimisation parameters, particularly for the purpose electric machine design, which in turn reduced the search space, increase efficiency and ability to find optimal solution with lower computation time. The optimisation was applied to search for optimal parameters of a benchmark electric machine with multi-objective to reduce the cost and increase the power density, power-volume ratio and efficiency. Throughout the thesis, a full detailed analytical model for the design of brushless permanent magnet synchronous motor that account for electromagnetic and thermal aspects was described. The optimisation was employed to search for optimal parameters of the analytical model that satisfy the design requirements. Then, the generated optimal parameters were evaluated and verified by Finite Element Analysis, FEA. The results from the FEA show good agreement with their corresponding values in the analytical model within acceptable range. At the same operational conditions and output specifications, the results show that the power density, volume to power ratio and cost of the new optimised motor IV were all increased by 19%, 39%, 24% respectively and the efficiency reduced only by -1%. The optimisation was also compared with one of the most usable optimisation algorithm used in the design of electric machine i.e. Genetic Algorithm. The results show that bees algorithm has more ability to cover the search space with less number of recruited bees and less number of iterations and higher computation efficiency.

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Alekseeva, Natalia Mihajlovna, and Natalia Alekseeva. "Developing an autosteering of road motor vehicles in slippery road conditions." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13155942/?lang=0, 2020. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13155942/?lang=0.

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In the nearest future, the human driver is viewed as a reliable backup even for the fully automated road motor vehicles (cars). Indeed, the driver is assumed to swiftly take the control of the car in cases of suddenly occurring (i) challenging environmental conditions, (ii) complex unforeseen driving situations, or (iii) degradation of performance of the car. However, due to the cognitive overload in such a sudden, stressful takeover of the control, the driver would often experience the startle effect, which usually results in an unconscious, instinctive, yet incorrect response. An extreme case of startle is freezing, in which the driver might be incapable to respond to the sudden takeover of control at all. The possible approaches to alleviate the startle during the takeover of control (i.e., the automation startle) include an offset- (i.e., either early- or delayed-), gradual yielding the controls to the driver. In the cases considered above, however, these approaches are hardly applicable because of (i) the presumed unpredictability of the events that result in the need of takeover of control, and (ii) the severe time constraints of the latter. Conversely, the objective of our research is to propose an approach of minimizing the need of yielding the control to the driver in challenging environmental conditions by guaranteeing an adequate automated control in these conditions. Focusing on slippery roads as an instance of challenging conditions, and steering control as an instance of control, we aim at developing such an automated steering that controls the car adequately in various road surfaces featuring low friction coefficients without the need of driver’s intervention.In order to develop such an automated steering we employed an in-house evolutionary computation framework – XML-based genetic programming (XGP) – which offers a flexible, portable, and human readable representation of the evolved optimal steering functions. The trial runs of the evolved steering functions were performed in the Open Source Racing Car Simulator (TORCS), which features a realistic, yet computationally efficient simulation of the car and its environment. The obtained experimental results indicate that due to the challenging dynamics of the unstable car on slippery roads, neither the canonical (tuned) servo-control (as a variant of PD) nor the (tuned) PID-controller could control the car adequately on slippery roads. On the other hand, the controller, featuring a relaxed, arbitrary structure evolved by XGP outperforms both the servo- and PID controllers in that it results in a minimal deviation of the car from its intended trajectory in rainy, snowy, and icy road conditions. Moreover, the evolved steering that employs anticipated perceptions is even superior as it could anticipate the imminent understeering of the car at the entry of the turns and consequently – to compensate for such an understeering by proactively turning the steering wheels in advance – well before entering the turn. The obtained results suggest a human competitiveness of the evolved automated steering as it outperforms the commonly used alternative steering controllers proposed by human experts. The research could be viewed as a step towards the evolutionary development of automated steering of cars in challenging environmental conditions.
博士(工学)
Doctor of Philosophy in Engineering
同志社大学
Doshisha University

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Corrigan, Eric R. "Evaluating heavy-duty diesel engine aftertreatment devices with a split exhaust configuration." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=1825.

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Thesis (M.S.)--West Virginia University, 2001.
Title from document title page. Document formatted into pages; contains x, 87 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 81-82).

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Hall, Timothy S. "Effect of vehicle weight and model year on vehicle contribution to atmospheric pollutant inventories." Morgantown, W. Va. : [West Virginia University Libraries], 2002. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=2623.

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Thesis (M.S.)--West Virginia University, 2002.
Title from document title page. Document formatted into pages; contains xii, 114 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 110-111).

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Kern, Justin M. "Inventory and prediction of heavy-duty diesel vehicle emissions." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1245.

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Thesis (M.S.)--West Virginia University, 2000.
Title from document title page. Document formatted into pages; contains x, 125 p. : ill. (some col.), map Includes abstract. Includes bibliographical references (p. 100-103).

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Byers, Richard J. "Measurement of particulate matter size, concentration and mass emissions from in-use heavy duty vehicles." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=1146.

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Thesis (M.S.)--West Virginia University, 1999.
Title from document title page. Document formatted into pages; contains xxi, 289 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 259-262).

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Shrestha, Kreepa. "An Assessment of the Contribution of Micro-scale Activities to Personal Pollution Exposure in Commuting Micro-environments." Thesis, University of Canterbury. Geography, 2009. http://hdl.handle.net/10092/3686.

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Exposure to traffic pollution has become an increasing concern to public health. A number of studies have demonstrated that the air people breathe in while in transportation is particularly unsafe due to the high concentrations of carbon monoxide (CO), suspended particles (PM10, PM2.5 and PM1) and ultrafine particles (UFPs). Some studies have suggested that peak exposures of approximately one hour- a typical time spent in a transport micro-environment- may have more damaging health effects than the 24- hour sampling times current standards apply to Despite the widespread interest in health effects from exposure to traffic pollutants, there is a distinct lack of research of this kind in New Zealand. The research presented in this thesis was designed to assess the effect of traffic emissions on personal exposure. More specifically, this project intended to examine how exposures differed on different modes of transport and also to investigate the extent to which transport micro-environments such as car parks, bus stops and metro stations contributed to personal exposure levels. This study is the first of its type in New Zealand, which simultaneously monitored CO, PM and UFP concentrations in the transport micro-environment. Vehicular traffic emissions were shown to be a significant source of air pollution in populated urban areas, especially in the transport microenvironment. This results of this study showed that the mode of transport is a significant determinant of personal exposure to pollutants. The information gathered indicated slightly different results for Christchurch and Auckland, possibly due to variations in background levels, traffic counts and meteorological conditions at the time of monitoring. Results from the research also showed that built transport microenvironments could experience extremely high levels of pollutant exposures. Although commuters spend a relatively short time in such environments, such short-term peak exposures could contribute significantly to adverse health effects. The results presented here have relevance for both public health and for policies aimed at reducing human exposures to traffic-related air pollution. It is imperative to incorporate policies which ensure that such built environments are as safe as possible in terms of keeping exposure levels at a minimum.

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Wu, Zhan-Yuan. "Energy efficient PWM induction machine drives for electric vehicles." Thesis, University of Sheffield, 2000. http://etheses.whiterose.ac.uk/14622/.

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The viability of any electric vehicle is critically dependent on it having an acceptable range between charges, a feature which is ultimately dictated by the capacity of the battery energy store. Considerable improvements in vehicle range are possible, however, by ensuring the most effective use of this limited energy resource through the minimisation of the losses in the electric drive-train, i.e. the combined machine and power electronic controller. A particular consideration is that, for the majority of the time, the electric drive-train will be operating at part load. The thesis investigates the operation of induction motor based electric traction drive-trains, with a view to minimising the system loss over typical driving cycles. The study is based around a 26kW induction motor and IGBT inverter drive, which is typical of the technology used to power a small urban vehicle. A potential advantage of an induction motor based drive-train is the ability to vary the level of excitation field in the motor, and therefore the balance of iron and copper loss. The control of the supply voltage magnitude necessitates the use of some form of modulation on the output of the power converter. The method of modulation employed will influence the harmonic content of the supply to the motor, the level of parasitic harmonic loss in the machine and the switching losses of the power semiconductors. A theoretical study supported by experimental work on a DSP controlled drive is presented and used to determine the most appropriate modulation strategy at a given operating point to achieve an optimal balance between the motor copper, iron and harmonic loss and inverter switching and conduction loss. It is shown that compared to the established method of constant flux and fixed inverter switching frequency control, a significant reduction in the traction system loss can be achieved. Some different modulation schemes involve varying amounts of computational overhead in a DSP, the implementation of candidate modulation and control schemes has also been investigated to ensure the defined scheme is practically realisable.

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Dissertations / Theses on the topic 'Bureau of Motor Vehicles'

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