Dissertations / Theses on the topic 'Non-automotive'
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Dutka, Arkadiusz Stanisław. "Non-linear identification, estimation and control of automotive powertrains." Thesis, University of Strathclyde, 2005. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=24339.
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Increasingly tight emission regulations put a pressure on control engineers to come up with improved engine control systems. The task is difficult, as it is desired to minimize complexity, cost and maximize reliability and performance, all at the same time. Fortunately, modern control techniques offer assistance in achieving these goals. This motivation resulted in a range of topics developed in this thesis. A modelling, estimation and fault detection theory is presented. The estimation theory is often used for the system identification, but its main application is the model-based filtering, so important in real systems. The real systems are subject to failures. A theoretical development of the fault detection algorithm for non-linear systems is presented. The emphasis moves then to the control algorithms design. The non-linear algorithms based on the state-dependent model structure are introduced. An extension of the state-dependent Riccati equation method with a future trajectory prediction is developed. Also, the non-linear version of generalized predictive control algorithm is presented. Optimality of solutions is analyzed and corrections to algorithms are introduced to preserve the optimality. The theory needs practical verification. The identification of the spark ignition engine is presented next. A datadriven system identification method is developed. It provides an accurate model for control design purposes. The predictive control algorithm design is presented next. A simple air-fuel ratio control as well as a full multivariable control system design, with a torque as an output, is introduced. Improved tracking and tighter air-fuel ratio regulation is achieved. The control system efficiency may be impaired by the system noise and the model uncertainty. For that reason the model-based estimation techniques are very important. It is demonstrated that not only the noise immunity, but also robustness is significantly improved when Kalman filtering methods are employed. Last important topic of fault diagnosis is then presented. Faults must be detected, isolated and identified to enable successful control system re-configuration.
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Whitelaw, David Stuart. "Droplet atomisation of Newtonian and non-Newtonian fluids including automotive fuels." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266620.
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Borwankar, Raunak. "Optical Non-Destructive Surface Inspection and Automatic Classification of Cast Iron Automotive Part." Digital WPI, 2017. https://digitalcommons.wpi.edu/etd-theses/1229.
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Over the past decade, research into computer vision has proliferated with the goal to incorporate artificial intelligence into a wide range of applications. These applications can be as sophisticated as intelligent assistants in smartphones and self-driving cars or as mundane as text and face recognition. While most of these applications are software based, they represent unique challenges when it comes to industrial implementation. This thesis concentrates on an optical non-destructive testing (NDT) and automatic classification methodology using customized image processing techniques. In contrast to conventional spatial analyses, which are highly susceptible to noise and human perception, our proposed transform domain approach provides a high degree of robustness and flexibility in feature selection and hence a better classification efficiency. Our presented algorithm classifies the Part-Under-Test (PUT) into two bins of either acceptable or faulty using transform domain techniques in conjunction with a classifier. Because the classification is critically dependent on the features extracted from these images, a sophisticated scalable database was created. This thesis applies transform domain techniques such as Discrete Wavelet Transform (DWT) and Rotated Wavelet Transform (RWT) for feature extraction and then classifies the PUT based on those features. Although, this approach achieves promising classification efficiency, it does not meet industrial standards. It was concluded that in order to achieve those standards, the effect of emissivity fluctuations of the PUT should be negated. The research was then extended to apply an image acquisition algorithm in the form of shape from polarization. The approach exploits the partially linearly polarization of reflected light from the PUT surface. It was observed that this method could not only detect if the PUT is faulty or fault free, but also highlight the locations of the flaws.
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Didonè, Marco. "Advanced Non-Destructive Inspections focused on composite materials application for the automotive and marine sectors." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.
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The goal of this master thesis is to explain in detail the application of Non-Destructive-Inspection on the Automotive and the Marine sectors. Nowadays, these two particular industries faces many challenges, including increased global competition, the need for higher performance, a reduction in costs and tighter environmental and safety requirements. The materials used for these applications play key roles in overcoming these challenges. So, also an NDI procedure need to be planned in order to avoid problems during the manufacturing process and the after sale life of the structures. The entire thesis work has been done in collaboration with Vetorix Engineering.
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Coleman, Alastair Sean. "An examination of the effects of non-ideal operating conditions on the performance of automotive waterpumps." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0017/MQ58004.pdf.
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Pfleging, Bastian [Verfasser], and Albrecht [Akademischer Betreuer] Schmidt. "Automotive user interfaces for the support of non-driving-related activities / Bastian Pfleging ; Betreuer: Albrecht Schmidt." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2017. http://d-nb.info/1130656977/34.
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Thiyagarajan, Prasanna B. "Non-linear finite element analysis and optimization for light weight design of an automotive seat backrest." Connect to this title online, 2008. http://etd.lib.clemson.edu/documents/1233080753/.
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Almquist, Arne J. "The Adoption and Use of Electronic Information Resources by a Non-Traditional User Group: Automotive Service Technicians." Thesis, University of North Texas, 2006. https://digital.library.unt.edu/ark:/67531/metadc5301/.
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The growing complexity of machines has led to a concomitant increase in the amount and complexity of the information needed by those charged with servicing them. This, in turn, has led to a need for more robust methods for storing and distributing information and for a workforce more sophisticated in its use of information resources. As a result, the service trades have "professionalized," adopting more rigorous academic standards and developing ongoing certification programs. The current paper deals with the acceptance of advanced electronic information technology by skilled service personnel, specifically, automotive service technicians. The theoretical basis of the study is Davis' technology acceptance model. The purpose of the study is to determine the effects of three external factors on the operation of the model: age, work experience, and education/certification level. The research design is in two parts, beginning with an onsite observation and interviews to establish the environment. During the second part of the research process a survey was administered to a sample of automotive service technicians. Results indicated significant inverse relationships between age and acceptance and between experience and acceptance. A significant positive relationship was shown between education, particularly certification, and acceptance.
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Martin, Lucy. "Non-automotive manufacturing in the Eastern Cape: a study of the sector's decline and possible policy solutions." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/6834.
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The automotive and automotive components industry has long formed the backbone of manufacturing in the Eastern Cape. Supported by the Motor Industry Development Programme (MIDP) since 1995, the sector has been a major source of industrial growth and employment creation in the province. In contrast, the province's non-automotive manufacturing (NAM) firms, the vast majority of which were attracted to the area by generous apartheid-era incentive schemes in the 1970s and 1980s, are struggling to maintain output and employment in the absence of government support. Since the withdrawal of incentives in 1992, non-automotive subsectors have experienced a contraction in output and employment, few new entrants, little innovation, and a substantial amount of firm closures. This thesis aims to identify the current constraints facing non-automotive manufacturing firms in the Eastern Cape. Its findings are based on interviews conducted in September and October 2013. 25 firms and 7 key industry representatives were interviewed in the metros and surrounding industrial areas of East London and Port Elizabeth. Interviews were structured loosely around a questionnaire that focused on eight identified constraining factors. The interview process was conversational, aimed at engaging in a meaningful dialogue with firms and industry representatives. The secondary aim of this thesis is to utilise the information obtained through firm interviews to provide possible targeted policy solutions to address the constraints facing non-automotive manufacturing subsectors in the Eastern Cape. In light of the Eastern Cape Provincial Industrial Development Strategy's (PIDS) scheduled revision in 2015, this thesis makes the case for (1) placing a larger emphasis on regionally and sectorally specific industry policies within the new PIDS;; and (2) increasing engagement with the private sector in order to better inform the policymaking process.
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Taljaard, Jacob Johannes. "Improving job performance by using non-monetary reward systems to motivate low-skilled workers in the automotive component industry." Thesis, Port Elizabeth Technikon, 2002. http://hdl.handle.net/10948/131.
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Automotive component manufacturing companies where the labour is low skilled and the processes are labour intensive, are being challenged on a more regular basis to find methods to satisfy needs to motivate employees to improve performance. Automotive companies are becoming more under pressure to motivate employees through non-monetary rewards, due to collective bargaining which has made pay for performance very inflexible. It is because of this fact that employers have to assess non-monetary reward methods to motivate employees to improve performance. To be motivators, rewards must be aligned with the needs of people and the things that they value. If these rewards are aligned with employees needs, this could lead to increase in employee motivation, which will in turn lead to improvement in performance, and therefore lead to companies becoming more competitive. This research paper aims to assess what would be the motivators when establishing a non-monetary reward system. To this end the various motivational theories are presented which clearly identifies what needs people have and how they can be satisfied to change behaviour and therefore improve performance. Secondly, reward systems are discussed with various types of rewards being considered and more specifically non-monetary rewards. Applied research was undertaken to determine non-monetary rewards that will motivate low-skilled employees to improve performance. A survey, with the aid of a structured questionnaire, was used to gain information from 60 employees. The research was conducted in three companies that manufacture components for the auto industry. The majority of the respondents indicated that: 1. basic needs must be satisfied with monetary rewards; 2. non-monetary rewards, if linked to higher hierarchical needs, will then motivate employees; 3. non-monetary rewards should preferably be of a physical nature such as certificates, caps and t-shirts; 4. satisfaction of these higher level needs motivate employees and improve their performance; 5. employees prefer feedback and recognition as a non-monetary reward on a regular basis, and 6. the needs of employees should be identified through a survey to establish which rewards will satisfy these needs.
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Al-Jader, Mohamad Aqeel. "Investigation of spot welding electrode tip wear and a non-destructive test of plastic joining in the automotive industry." Thesis, Liverpool John Moores University, 2014. http://researchonline.ljmu.ac.uk/4445/.
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The automotive industry is reliant on resistance spot-welding just as the sandwich making industry is reliant on bread. An automobile contains an average of 5000 welds. The quality of these welds is inspected and governed by certain standards. In order to maintain these standards there are different approaches to quality control. There are many factors that are accountable to a successful weld. The main factors are the voltage across the electrodes, the pressure applied by the electrodes at the interface of the metal sheets, the current applied, the surface condition and the composition of the sheets. The main problem in determining whether a weld complies with the standard is that the most reliable test is a destructive test, which not only destroys a potentially good weld, but it stalls the entire production line in order to perform the test. This is a process where the weld is taken apart sometimes with a chisel. Once the weld is dismantled the quality can be analysed. During the course of this thesis the chisel test, and other comparable tests were carried out. The following thesis presents an overview of electrode current selection and its variance over the lifetime of the electrode tip. This also describes the proposed analysis system for the selection of welding parameters for the spot welding process, as the electrode tip wears. Data from the practical tests is analysed using SORPAS Software Package in order to compare between real life practical tests, and theoretical simulations preformed in SORPAS. Reducing sparks caused during each weld is another requirement to prevent bumps on the bodywork that may cause further complications at later stages, this project will greatly improve productivity in the production line, since damaged tips can be identified and changed during the manufacturing process. The results show that at a pressure of 4.0bar productivity of welds that conform with the necessary British standards was increased three fold. A new type of non-invasive plastic bond testing is also investigated. This bond testing research was driven by the industrial need for a novel real-time non-destructive method of measuring both the quantity and type of material. Microwave sensors which monitor the change in permittivity of PF glue were developed for this purpose and successfully tested. These sensors have also been used to differentiate between different plastics.
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Duan, Chengwu. "Dynamic analysis of dry friction path in a torsional system." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1092672620.
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Thesis (Ph. D.)--Ohio State University, 2004.Title from first page of PDF file. Document formatted into pages; contains xxiv, 200 p.; also includes graphics (some col.). Includes bibliographical references (p. 196-200). Available online via OhioLINK's ETD Center
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Nara, Kameswara R. "Analysis of non load bearing two component (2K) adhesives; under the automotive hemming process variations; thermogravimetric, calorimetric and composition analyses." Connect to this title online, 2008. http://etd.lib.clemson.edu/documents/1219861632/.
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Walkingshaw, Jason Robert. "An investigation into the impact of stator vane tip clearance location & non-conventional turbine rotor designs for automotive applications." Thesis, Queen's University Belfast, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603481.
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To meet market demands and yet fulfil legislation engines are now required to maintain current power levels but be more efficient at part load. Operating in this region means the turbine will be operating at low velocity ratios. This work aimed at targeting key automotive objectives which included; improving off-design performance, increasing MFR and reducing inertia, using non-conventional designs. A detailed numerical and experimental investigation of a scaled automotive VGT was carried out to better understand the flow characteristics in the blade passage. An initial study was performed at three different stator vane MFR positions to assess the impact of stator vane tip clearance location on radial turbine performance. Following this two rotor designs, one back swept, the other a splitter blade design, were simulated and tested at different stator vane positions, to ascertain their suitability at meeting automotive requirements. It was found that operating with hub side stator vane tip clearance improved efficiency by 4.5% points at the minimum MFR stator vane position. The study showed that the stator vane tip Jeak.e.ge produced a vortex which augmented the flow and improved incidence and flow development in the rotor passage. The back swept rotor design reduced the incidence angle allow values of VIC and improved efficiency by 1.3% and 2.0% points at the minimum and 25% MFR stator vane positions respectively. However, at the design point efficiency dropped by 4.4% points and MFR was reduced by 4.7%. A 5+5 splitter design improved efficiency by 1.0% point at the minimum MFR stator vane position. At the design MFR also increased by 5%. However, efficiency was seen to drop between 0.5% to 3% points at the maximum MFR stator vane position. An additional benefit of the splitter design was reduced inertia. Inertia was decreased by 3.7%.
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Kim, Tae-Chung. "Analysis of Clearance Non-linearities and Vibro-impacts in Torsional Systems." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1053634349.
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Lundin, Hjalmar. "Using non-kinematic information to reduce the complexity of data association : A multi-sensor, multi-target association algorithm for automotive applications." Thesis, KTH, Maskinkonstruktion (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-190206.
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Detta är ett examensarbete på mastersnivå gjort i samarbete med Scania CV AB. Avancerade förarstödssystem är en drivande faktor mot ökad säkerhet och bränsleeffektivisering i fordonsindustrin. När fordon i ökad utsträckning blir mer och mer automatiserade och komplexa, så ökar behovet av en precis representation av omgivningen runt fordonet som görs med hjälp av sensorer. Detta uppnås både genom att addera sensorer för att öka deras synfält, och genom att använda flera sensorer för samma synfält för ökad pålitlighet. Vanliga sensorteknologier, såsom kamera och radar, som används för målföljning behövs kombineras för att erhålla ett bättre estimat. Att kombinera information från flera sensorer kallas for sensor fusion. Sensor fusion kan delas in i två delproblem; dataassociation och estimering av tillstånd. Med ökande mängd mätdata från flera sensorer så ökar komplexiteten exponentiellt vilket är problematiskt i ett fordon med begransad beräkningskapacitet där beräkningarna görs i realtid. Syftet med examensarbetet är därför att utforska vilken algoritm som kan tänkas användas som en framtida målföljningsalgoritm i fordonsindustrin. Forskningen har fokuserat på att utforska lösningar för målföljning för ett fordon, fokuserat på hur dataassociation kan lösas när antalet mål och sensorer ökar. Litteraturstudien har varit inriktad på algoritmer som används i en decentraliserad arkitektur, eftersom detta är den vanligaste typen inom fordonsindustrin. Genom undersökning av olika angreppsätt beskrivna i litteraturen, så utvecklades en algoritm och implementerades på en PC och jämfördes mot en målföljningsalgoritm som används i fordonsindustrin idag. Jämförelsen gjordes i två olika scenarion med mätdata inspelat med en lastbil. Resultatet är algoritm som använder ytterligare information förutom tillståndsvektorer från sensorerna, som t.ex. ID, för att underlätta dataassociation. Genom att använda denna information kan dataassociationen lösas snabbare än med dagens algoritmer och behålla samma precision. Eftersom antalet mål och sensorer förväntas öka i framtiden så är fördelen med en snabbare dataassociationalgoritm betydande. Algoritmen är byggd i en modular design och förberedd för det växande antal sensorer som förväntas i framtida fordonsapplikationer.
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Sonje, Abhijit Ravindra. "Experimental and finite element investigation into the effects of manufacturing variability on the dynamic response of a bolted interface between a bracket and a thin-walled sheet metal structure." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546418059243072.
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Merotte, Justin. "Contribution a l'étude des matériaux composites renforcés par des fibres végétales aiguilletées." Thesis, Lorient, 2017. http://www.theses.fr/2017LORIS444.
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Proposer des solutions permettant de concevoir et de fabriquer des pièces automobiles performantes mais également respectueuses de l’environnement est devenu un enjeu majeur pour les équipementiers automobiles. Ces travaux de thèse s’inscrivent donc dans ce contexte de compréhension et d’amélioration des matériaux composites non-tissés aiguilletées renforcés par des fibres végétales. À partir d’un même matériau de base, il est possible d’obtenir des structures et des propriétés différentes grâce au contrôle du taux de porosités dans le matériau. On peut ainsi conférer au composite de bonne propriétés d’absorption acoustique à des taux de porosités élevés (50%) ou au contrainte privilégier la tenue mécanique du produit en les limitant. La structure du matériau et la liaison fibre/matrice vont évoluer avec la fraction de porosités et en résulteront des comportements mécaniques bien différents. Suivant le taux de porosité, les performances mécaniques seront donc principalement gouvernées par des paramètres différents tels que la liaison interfaciale ou le renfort. Dans un environnement automobile, les conditions climatiques (humidité et température) jouent un rôle prépondérant dans les performances des biocomposites non-tissés. En effet, l’adhérence fibre/matrice est essentiellement liée aux contraintes radiales compressives, qui sont largement influencées par l’état hygrométrique du renfort. Enfin, la valorisation les chutes de fabrication issues de la thermocompression pour modifier la structure du composite non-tissé a permis de développer un produit présentant un gain en rigidité significatifProposing solutions to produce more efficient and environmentally friendly automotive parts has become a major challenge for tier one suppliers. The work described in this thesis is about understanding and improving composite materials made with commingled plant fibre nonwovens. From the same initial nonwoven, it is possible to obtain very distinct material structures by controlling porosity content. One can then give to the material enhanced acoustic properties with high porosity content (50%) or in the contrary show good mechanical properties by limiting porosities. Material structure will evolve with porosity as well as its mechanical behavior. Thus, as function of porosity, interfacial adhesion of fibre mechanical properties will govern composite mechanical properties. Biocomposite automotive parts are exposed to a large range of climatic environments and their mechanical properties can vary significantly. Indeed, radial stresses are drastically influenced by the reinforcement hygroscopic state. Finally, the idea developing an innovative material structure from compression moulding wastes has helped enhancing material rigidity
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Gendre, Félix. "Développement de méthodes de Boltzmann sur réseau en maillages non-uniformes pour l'aéroacoustique automobile." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0196/document.
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L’objectif de ce travail est d’étudier les capacités de la méthode de Boltzmann sur réseau (LBM) dans un cadre numériquement contraignant : celui de la simulation aéroacoustique en maillage non-uniforme, à très haut nombre de Reynolds et à nombre de Mach non négligeable (Ma > 0.1), appliquée à l’automobile. La problématique industrielle est celle du calcul du bruit intérieur d’origine aérodynamique, dont le calcul du champ de pression pariétal instationnaire sur le vitrage conducteur est la première étape décisive. Il a été constaté qu’un manque de précision sur la faible part acoustique du champ de pression total sur le vitrage, provenant très probablement d’erreurs au niveau des transitions de résolution du maillage, était la cause d’une surestimation du bruit intérieur. Nous présentons d’abord une construction cohérente et unifiée de la méthode de Boltzmann sur réseau à partir de l’équation de Boltzmann, dans un cadre athermal faiblement compressible. Nous étudions ensuite en détail les propriétés aéroacoustiques de la LBM, en parcourant toutes les grandes familles d’opérateurs de collision de la littérature. Une variante de modèle à temps de relaxation multiples, utilisable pour l’aéroacoustique, est présentée et testée. Un modèle alternatif simplifié de filtrage sélectif, rapide et compact, est développé et validé. La problématique des maillages non-uniformes est abordée. Un recensement exhaustif des études LBM menées dans ce cadre dans la littérature montre qu’aucune ne correspond à nos contraintes. Des algorithmes alternatifs aux transitions sont développés. Enfin, des applications industrielles sont réalisées à l’aide des modèles développés dans le mémoireThe main goal of this work is to study the capacities of the Lattice Boltzmann Method in a constrained numerical framework : that of numerical simulation in automotive aeroacoustics with non-uniform meshes, at high Reynolds number and non egligible Mach number (Ma > 0.1). The industrial problem is the computation of the interior aerodynamic noise, which includes as its first decisive step the computation of the unsteady wall pressure field on the car windows. It was observed that a lack of precision on the weak acoustic part of the total pressure field on the driver-side window, which is most probably due to errors at mesh refinement interfaces, caused an overestimation of the interior noise. We first present a coherent and unified construction of the Lattice BoltzmannMethod from the Boltzmann equation, in an athermal weakly compressible framework. Then, we study in details the aeroacoustic properties of the LBM by reviewingall the main families of collisional operators that exist in the literature. A variant of multiple relaxation time operator that can be used for aeroacoustics is presented and tested. A simplified alternative selective filter, fast and compact, is developped and numerically validated. The problem of non-uniform meshes is discussed. An exhaustive review of the LBM studies that have been carried out within that framework shows that none of them corresponds to our constraints. Alternative transition nodes algorithms are developed. Finally, all the developed models of this work are applied to industrial cases
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Jefremow, Mihail Verfasser], Doris [Akademischer Betreuer] [Schmitt-Landsiedel, and Heinrich [Akademischer Betreuer] Klar. "Power Efficient and Robust Sense Amplifiers for Embedded Non-Volatile Memories in High-Speed Microcontrollers for Automotive Applications / Mihail Jefremow. Gutachter: Heinrich Klar ; Doris Schmitt-Landsiedel. Betreuer: Doris Schmitt-Landsiedel." München : Universitätsbibliothek der TU München, 2014. http://d-nb.info/1063724074/34.
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Handschuh, Michael James. "A Methodology to Establish Scuffing Limits for Lubricated Point Contacts Subject to Sliding." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543264619849807.
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Sharifimehr, Shahriar. "Multiaxial Fatigue Analysis under Complex Non-proportional Loading Conditions." University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1544787705876488.
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Murali, madhavan rathai Karthik. "Synthesis and real-time implementation of parameterized NMPC schemes for automotive semi-active suspension systems." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALT052.
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Cette thèse traite de la synthèse et de la mise en œuvre en temps réel (RT) de schémas de contrôle prédictif non linéaire paramétré (pNMPC) pour les systèmes de suspension semi-active des automobiles. Le schéma pNMPC est basé sur une technique d'optimisation par simulation en boîte noire. Le point essentiel de la méthode est de paramétrer finement le profil d'entrée et de simuler le système pour chaque entrée paramétrée et d'obtenir la valeur approximative de l'objectif et de la violation des contraintes pour le problème pNMPC. Avec les résultats obtenus de la simulation, l'entrée admissible (si elle existe) ayant la valeur objective minimale ou, à défaut, la valeur de violation de contrainte la plus faible est sélectionnée et injectée dans le système et ceci est répété indéfiniment à chaque période de décision. La méthode a été validée expérimentalement sur dSPACE MicroAutoBoX II (MABXII) et les résultats montrent de bonnes performances de l'approche proposée. La méthode pNMPC a également été étendue à une méthode pNMPC parallélisée et la méthode proposée a été mise en œuvre pour le contrôle du système de suspension semi-active d'un demi-véhicule. Cette méthode a été mise en œuvre grâce à des unités de traitement graphique (GPU) qui servent de plate-forme modèle pour la mise en œuvre d'algorithmes parallèles par le biais de ses processeurs multi-cœurs. De plus, une version stochastique de la méthode pNMPC parallélisée est proposée sous le nom de schéma pNMPC à Scénario-Stochastique (SS-pNMPC). Cette méthode a été mise en œuvre et testée sur plusieurs cartes NVIDIA embarquées pour valider la faisabilité de la méthode proposée pour le contrôle du système de suspension semi-active d'un demi-véhicule. En général, les schémas pNMPC parallélisés offrent de bonnes performances et se prêtent bien à un large espace de paramétrage en entrée. Enfin, la thèse propose un outil logiciel appelé "pNMPC - A code generation software tool for implementation of derivative free pNMPC scheme for embedded control systems". L'outil logiciel de génération de code (S/W) a été programmé en C/C++ et propose également une interface avec MATLAB/Simulink. Le logiciel de génération de code a été testé pour divers exemples, tant en simulation que sur du matériel embarqué en temps réel (MABXII), et les résultats semblent prometteurs et viables pour la mise en œuvre de la RT pour des applications réelles. L'outil de génération de code S/W comprend également une fonction de génération de code GPU pour une mise en œuvre parallèle. Pour conclure, la thèse a été menée dans le cadre du projet EMPHYSIS et les objectifs du projet s'alignent sur cette thèse et les méthodes pNMPC proposées sont compatibles avec la norme eFMIThis thesis discusses the synthesis and real-time (RT) implementation of parameterized Nonlinear Model Predictive Control (pNMPC) schemes for automotive semi-active suspension systems. The pNMPC scheme uses a black-box simulation-based optimization method. The crux of the method is to finitely parameterize the input profile and simulate the system for each parameterized input and obtain the approximate objective and constraint violation value for the pNMPC problem. With the obtained results from the simulation, the input with minimum objective value or the least constraint violation value is selected and injected into the system and this is repeated in a receding horizon fashion. The method was experimentally validated on dSPACE MicroAutoBoX II (MABXII) and the results display good performance of the proposed approach. The pNMPC method was also augmented to parallelized pNMPC and the proposed method was implemented for control of semi-active suspension system for a half car vehicle. This method was implemented by virtue of Graphic Processing Units (GPUs) which serves as a paragon platform for implementation of parallel algorithms through its multi-core processors. Also, a stochastic version of the parallelized pNMPC method is proposed which is termed as Scenario-Stochastic pNMPC (SS-pNMPC) scheme and the method was implemented and tested on several NVIDIA embedded boards to verify and validate the RT feasibility of the proposed method for control of semi-active suspension system for a half car vehicle. In general, the parallelized pNMPC schemes provide good performance and also, fares well for large input parameterization space. Finally, the thesis proposes a software tool termed “pNMPC – A code generation software tool for implementation of derivative free pNMPC scheme for embedded control systems”. The code generation software (S/W) tool was programmed in C/C++ and also, provides interface to MATLAB/Simulink. The S/W tested for variety of examples both in simulation as well as on RT embedded hardware (MABXII) and the results looks promising and viable for RT implementation for real world applications. The code generation S/W tool also includes GPU code generation feature for parallel implementation. To conclude, the thesis was conducted under the purview of the EMPHYSIS project and the goals of the project align with this thesis and the proposed pNMPC methods are amenable with eFMI standard
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Losero, Rémi. "Contrôle en couple et en vitesse du glissement d'un embrayage simple ou double dans une transmission automobile." Thesis, Valenciennes, 2016. http://www.theses.fr/2016VALE0005/document.
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Cette thèse de doctorat a été réalisée dans le cadre d’une convention CIFRE établie entre le laboratoire LAMIH UMR CNRS 8201 et l’équipementier automobile Valeo. Les problématiques de la thèse s’inscrivent dans un contexte proche de l’industrialisation à savoir l’estimation des couples embrayages lors des phases de changement de rapport dans une transmission à double embrayage et le contrôle de la vitesse de glissement de l’embrayage pour une transmission à simple ou à double embrayage. Afin de répondre à la problématique d’estimation de couple embrayage, un capteur virtuel de couple a été développé. Ce capteur virtuel est composé d’une estimation de la torsion des arbres de transmission basée sur une méthode d’ajout de dents virtuelles dans les capteurs incrémentaux d’une part, et d’un observateur Takagi-Sugeno discrétisé dans le domaine angulaire d’autre part. Ce procédé a permis l’estimation des couples embrayages d’une transmission à double embrayage sur une plateforme de simulation fournie par Valeo comportant un modèle complet de véhicule. Le procédé a également été testé sur des données réelles de débattement de double volant amortisseur, des estimations en ligne du couple moteur instantané acyclique et du couple embrayage ont alors été obtenues. Au cours de l’étude dédiée au glissement contrôlé de l’embrayage, une stratégie de contrôle robuste aux perturbations extérieurs induites par le conducteur et aux dispersions du système a été développée. Cette stratégie permet de répondre aux spécifications du cahier des charges en simulation. La stratégie de glissement contrôlé a également été validée sur véhicule lors d’essais sur piste et sur banc à rouleauThis PhD has been done in an industrial framework with the so-called automotive equipment manufacturer Valeo and the laboratory of Automatic Control, Mechanics, Informatics and Human Sciences LAMIH UMR CNRS 8201 of Valenciennes, France. The issues of this PhD are closed to the industrialization context such as the clutch torque estimation during the gear shifting phases in a dual clutch transmission and the clutch slip speed control. In order to solve the inline clutch torque estimation issues, a virtual torque sensor has been developed. On one hand, this virtual sensor is composed of a shaft torsion angle estimation based on a method of virtual tooth adding into the encoder sensors. On another hand, discrete angular domain unknown input Takagi-Sugeno observer is used for the estimation of the dynamic part of transmitted torque. This methodology has permitted the estimation of the transmitted clutch torque of a dual clutch transmission in simulation. The simulation results have been obtained on a simulation platform provided by Valeo, including a complete vehicle model. The methodology has also been tested on real data of a dual mass flywheel angular deflection. Thus, online estimation of instantaneous acyclic engine torque and transmitted clutch torque has been obtained. Concerning the slip control, a robust control strategy against the external disturbances leaded to the driver and the system parameters incertitude has been developed. This strategy permits to ensure the required specifications in simulation. The strategy has been also validated on vehicle during track trials
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Abakar, Issakha Souleymane. "Algorithms for the detection and localization of pedestrians and cyclists using new generation automotive radar systems." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S159.
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En réponse au nombre toujours élevé de décès provoqués par les accidents routiers, l'industrie automobile a fait de la sécurité un sujet majeur de son activité global. Les radars automobiles qui étaient de simples capteurs pour véhicule de confort, sont devenus des éléments essentiels de la norme de sécurité routière. Le domaine de l’automobile est un domaine très exigent en terme de sécurité et les radars automobiles doivent avoir des performances de détection très élevées et doivent répondre à des nombreuses contraintes telles que la facilité de production et/ou le faible coût. Cette thèse concerne le développement d’algorithmes pour la détection et la localisation de piétons et de cyclistes pour des radars automobiles de nouvelle génération. Nous avons proposé une architecture de réseau d'antennes non uniforme optimale et des méthodes d'estimation spectrale à haute résolution permettant d’estimer avec précision la position angulaire des objets à partir de la direction d'arrivée (DoA) de leur réponse. Ces techniques sont adaptées à l'architecture du réseau d'antennes proposé et les performances sont évaluées à l'aide de données radar automobiles simulées et réelles acquises dans le cadre de scénarios spécifiques. Nous avons également proposé un détecteur de cible de collision, basé sur la décomposition en sous-espaces Doppler, dont l'objectif principal est d'identifier des cibles latérales dont les caractéristiques de trajectoire représentent potentiellement un danger de collision. Une méthode de calcul d'attribut de cible est également développée et un algorithme de classification est proposé pour discriminer les piétons, cyclistes et véhicules. Les différents algorithmes sont évalués et validés à l'aide de données radar automobiles réelles sur plusieurs scenariosIn response to the persistently high number of deaths provoked by road crashes, the automotive industry has promoted safety as a major topic in their global activity. Automotive radars have been transformed from being simple sensors for comfort vehicle, to becoming essential elements of safety standard. The design of new generations automotive radars has to face various constraints and generally proposes a compromise between reliability, robustness, manufacturability, high-performance and low cost. The main objective of this PhD thesis is to design algorithms for the detection and localization of pedestrians and cyclists using new generation automotive radars. We propose an optimal non-uniform antenna array architecture and some high resolution spectral estimation methods to accurately estimate the position of objects from the direction of arrival (DOA) of their responses to the radar. These techniques are adapted to the proposed antenna array architecture and the performance is evaluated using both simulated and real automotive radar data, acquired in the frame of specific scenarios. We propose a collision target detector, based on the orthogonality of angle-Doppler subspaces, whose main goal is to identify lateral targets, whose trajectory features represent potentially a danger of collision. A target attribute calculation method is also developed and classification algorithm is proposed to classify pedestrian, cyclists and vehicles. This classification algorithm is evaluated and validated using real automotive radar data with several scenarios
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Carvalho, Cassius Vinicius de. "A extrafiscalidade e os seus reflexos para a atividade empresarial e para o poder Público na perspectiva do setor automotivo." reponame:Repositório Institucional do FGV, 2018. http://hdl.handle.net/10438/22058.
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A presente pesquisa propõe-se a contribuir com o estudo prático da extrafiscalidade no Direito Tributário brasileiro, com foco nas medidas extrafiscais adotadas pelo Poder Público no âmbito do setor automotivo, para o período compreendido de 2009 a outubro de 2017. Mais especificamente, o objetivo da pesquisa está adstrito à análise quanto ao nível de efetividade das normas preponderantemente extrafiscais, que suportaram a desoneração do IPI para o setor automotivo no período em exame. Inicialmente, buscou-se compreender o instituto, a partir do histórico das teorias de intervenção do Estado na perspectiva da extrafiscalidade para, a partir daí percorrerem-se os seus contornos jurídico-tributários, espécies, instrumentos de controle e abordagem no direito comparado. Subsequentemente, foi estudada, a importância do setor automotivo para o desenvolvimento econômico brasileiro, desde o início do século passado, para, por fim, analisarem-se os reflexos e o nível de efetividade das normas preponderantemente extrafiscais no bojo da pesquisa. A relevância do tema e a hipótese de pesquisa comprovaram-se no decorrer do texto, com a conclusão de que as normas preponderantemente extrafiscais não surtiram, em sua totalidade, para o caso em análise, os reflexos almejados pelo Poder Público – e igualmente esperados pelo contribuinte.
The purpose of the present research is to contribute to the practical study of the non-fiscal purpose tax law from a Brazilian tax perspective, with focus on the non-fiscal purpose tax laws that were introduced by the Public Sector in the context of the automotive segment, for the period from 2009 until October, 2017. More specifically, the objective of the research is restricted to the analysis of the level of effectiveness of the non-fiscal purpose tax laws that supported the decrease of the IPI in the automotive sector, for the period under analysis. Initially, the non-fiscal purpose tax law institute was comprehended with the support of the historic of the economic theories of intervention, and, as from this point on, the institute was studied in the context of its legal-tax aspects, types, instruments of control and approach in the comparative law. Subsequently, the research was centralized in the study of the relevance of the automotive sector in the development of the Brazilian economy, since the beginning of the last century. Finally, the reflexes and the level of the effectiveness of the non-fiscal purpose tax laws in the context of the automotive sector were evaluated. The relevance of the theme and the hypothesis of research were proved along the text, with the conclusion that the non-fiscal purpose tax laws did not reach, in its totality, for the case under analysis, the effects desired by the Public Sector - and expected by the taxpayers.
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Weise, Victoria Louise. "Ultrasonic techniques for adhesive bond examination of production automotive structures." Thesis, Keele University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263198.
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Oliver, Serna Clara. "Vibroacoustic analysis of car door and window seals." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC023.
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Les joints de porte et de vitrage des voitures jouent un rôle très important dans la réduction du bruit d’origine aérodynamique, à la fois par transmission directe et de par son rôle en tant que condition limite ees autres éléments transmetteurs (portes et fenêtres). Par conséquent, sa conception est fondamentale pour l’optimisation du confort de passager. Néanmoins, la méthode traditionnelle pour sa conception, basée sur une approche par tâtonnement de tests en soufflerie, est très coûteuse et insuffisante. Une approche différente est envisagée dans ce manuscrit, par la création d’un modèle capable de prédire la transmission du bruit jusqu’`a la cavité du véhicule, qui puisse être appliqué ultérieurement dans une routine d’optimisation. La modélisation des joints de vitrage et des fenêtres fait face à plusieurs difficultés. La fermeture de la porte subie par le joint de porte avant d’être soumis à l’excitation acoustique, ainsi que le comportement hyperélastique du caoutchouc, mènent à des déformations non-linéaires. Ce comportement change les propriétés (telles que la rigidité) du joint comprimé lors qu’il est soumis à l’excitation acoustique. De plus, l’interaction du son transmis par les joints avec la cavité du véhicule doit être prise en compte. Néanmoins, la taille réduite et la géométrie complexe du joint appellent à une approche telle que la méthode EF, tandis que la grande taille de la cavité véhicule nécessite d’une approche plus grossière, pour ne pas aboutir sur un modèle trop lourd. La solution proposée dans ce manuscrit implique la création d’un modèle hybride capable de modéliser le joint et la cavité séparément, avec l’approche la plus adaptée `a chaque cas, et de les coupler dans un seul modèle. Les comportements hyperélastique et viscoélastique des joints, avant et durant l’excitation acoustique, sont modélisés à l’aide du code commercial ABAQUS, tandis qu’une méthode énergétique appelée Méthode Energétique Simplifiée est utilisée pour la propagation ´ du son depuis les joints jusqu’au reste de la cavité. Cette méthode, adaptée aux besoins de l’application souhaitée, et couplée aux résultats du modèle EF, permet l’obtention rapide et locale du niveau de pression acoustique en n’importe quel point de la cavité. Finalement, des campagnes expérimentales sont mises en œuvre pour la validation des modèles. Les mises en place et les résultats sont détaillés dans ce manuscritCar door and window seals have been proven to be of utmost importance to reduce aerodynamic noise, both through direct transmission and through their role as boundary conditions of the other transmitting elements (car doors and windows). As consequence, their design has become of great relevance when it comes to passenger comfort optimization. However, the traditional method for their conception, based on a trial and error approach through wind-tunnel testing, has been found to be insufficient and costly. A different approach is contemplated in this dissertation, through the development of a model capable of predicting sound transmission through seals and into the vehicle cavity, for its subsequent application into an optimization procedure. Several difficulties arise from the modeling of car door and window seals. Indeed, the door closure imposed on the door seal before any acoustic excitation, as well as the hyperelasticity of the rubber lead to a non-linear deformation behavior. This behavior changes the seal properties (e.g. stiffness) which have to be modeled under acoustic excitation. Additionally, the interaction of the transmitted sound with the vehicle cavity must be taken into account. However, the small, precise geometry of the seal would call for an approach such as FE method, whereas the big dimensions of a vehicle cavity demand a much coarser approach so that the problem doesn’t become unmanageable in size. The solution that is proposed in this dissertation, implies the creation of an hybrid model capable of modeling the seal and the vehicle cavity separately, with the most adequate approach to each case, and coupling them afterward into a single model. As consequence, the hyperelastic and viscoelastic behaviors of the seals, prior to and during the acoustic excitation, are modeled through FE software ABAQUS, whereas an energy method called Méthode Energétique Simplifiée is used for the propagation ´ of the sound from the seal to the rest of the cavity. This method, improved to better suit the requirements of the discussed application, and coupled to the results of the FE model, allows a fast and local computation of the sound pressure level at any point inside the cavity. Finally, some experimental tests are put in place for the validation of the models. The different setups and results are detailed in this dissertation
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El, Helou Rayan. "Agent-Based Modelling of Pedestrian Microscopic Interactions." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469074726.
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Jackson, Robert Lee III. "The wear and thermo-elastohydrodynamic behavior of thrust washer bearings under non-axisymmetric loads." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5230.
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The goal of this work is to investigate the physical mechanisms that distress thrust washer bearings through physical modeling and numerical techniques. The thrust washer bearing is subjected to non-axisymmetric loads within the planetary gear sets of automatic transmissions in automobiles. In practice the thrust washer bearing often distresses severely and unpredictably, causing transmission breakdown and liability issues. A specially designed thrust washer bearing test rig allows for controlled variation of the operational parameters (speed, load, lubrication flow rate, etc.) governing the tribological behavior of the washer. The test rig also records pertinent real-time data (frictional torque and temperature) from the bearing. In conjunction with the experimental model, a new comprehensive numerical simulation of thrust washer bearings is constructed. The numerical simulation incorporates the effects of macro-scale deformation, micro-scale surface asperity contact, heat generation, boundary and full film lubrication. To model surface asperity contact, the current work performs an extensive finite element study of elasto-plastic spherical contact. The numerical and experimental results show that significant sliding asperity contact can cause high temperatures, high friction, and severe wear.
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Chretien, Benoît. "Simulation of a new automotive concept based on a centralized approach for driver assistance system activation decision." Thesis, Evry-Val d'Essonne, 2012. http://www.theses.fr/2011EVRY0033.
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De nos jours, afin d'améliorer la sécurité routière, de plus en plus de systèmes d'assistance à la conduite, appelé ADAS (Advanced Driver Assistance System) sont embarqués dans les véhicules. Leur augmentation rend le développement des véhicules toujours plus complexes. Pour parer à ces difficultés, dans un premier temps, ma thèse propose l'élaboration d'un simulateur de véhicule, capable d'aider le développeur. Afin de résoudre les problèmes de décisions et de synchronisation, l'état de l'art a été considéré pour choisir une architecture adaptée aux ADAS. En dernier lieu, un algorithme de prise de décision a été développé, pour optimiser l'intégrité du véhicule. Pour modéliser le véhicule, un simulateur émule le comportement planaire de celui-ci et des actionneurs qui agissent sur sa dynamique, tels que le moteur ou les freins. Une fois la base du véhicule réalisée, j'ai concentré mon travail sur les ADAS. Comme actuellement aucune solution concrète n’existe pour la stratégie de décision, afin de choisir l’aide la plus adaptée à la situation, le dernier point traité dans ma thèse a été le développement d'une décision assurant l'intégrité du véhicule. Celle-ci couple un calcul de trajectoire avec un ensemble invariant de Lyapunov, obtenu par un problème d'optimisation avec contraintes sous forme de d'inégalités matricielles bilinéaires. Elle permet d’évaluer l'activation des fonctions et de fournir un avertissement au conducteur dans les situations critiques. Pour illustrer le fonctionnement de cette décision, un exemple de contrôle longitudinal a été choisi, comprenant un régulateur automatique de vitesse et un freinage d'urgenceNowadays, to enhance traffic safety, more and more Advance Driver Assistance Systems (ADAS) are embedded in mass-production vehicles. Their increase renders development of vehicles more and more complex, especially to design Electronic and Electric (E/E) architecture, to synchronize the different embedded ADAS and decide which ADAS should be engaged. To cope with E/E architecture issues, my PhD thesis proposes a vehicle simulator, which is able to support architect designers. Then, to solve synchronization and decision problems, ADAS architecture has been chosen, according to the state of the art. Finally, a decision algorithm has been developed to optimise vehicle safety. To model the vehicle, a simulator emulates its plane motion according to embedded actuators acting on dynamic, like engine and brakes. Once the vehicle basis has been performed, I focus my work on ADAS. Because nowadays no generic solution exists to decide which ADAS to engage, last focus of my PhD has been the design of a decision method, optimizing vehicle safety. This latter couples a path-planning witch a Lyapunov invariant set, obtained through optimization problem constraints by bilinear matrix inequality. This strategy enables to assess embedded ADAS-functions and to warn the driver in critical situations. In order to illustrate this former, it has been illustrated with 2 longitudinal functions, a Adaptive Cruise Control and an Emergency Brake
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Simionatto, Vinícius Gabriel Segala 1986. "Estudo da influência dos parâmetros do pré-amortecimento da embreagem nos fenômenos de shuffle e clunk em trens de potência." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263769.
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Orientador: Milton Dias JúniorDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
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Resumo: O desenvolvimento de novas tecnologias na área automotiva e as restrições cada vez mais apertadas com relação a emissões culminaram em veículos cada vez mais leves, silenciosos e potentes. Por este motivo, os trens de potência atuais são cada vez mais susceptíveis a fenômenos de NVH. Além disso, pelo fato de os motores atuais emitirem menor nível de ruído, alguns destes fenômenos tornam-se mais perceptíveis. Neste contexto se encaixa o trabalho atual. Sabe-se que muitos problemas desta área são solucionados realizando alterações no disco de embreagem, e por isto, neste trabalho estuda-se a influência dos parâmetros de seu pré amortecedor nos fenômenos de shuffle e clunk. São feitas análises do trem de potência linearizado, por este ser um procedimento muito comum na área de desenvolvimento deste sistema. Após isso, analisa-se o mesmo sistema, através de simulações numéricas, porém considerando não linearidades no disco de embreagem e nos engrenamentos, onde foi considerado o impact damping. Identifica-se os pares engrenados que mais contribuem para o surgimento do fenômeno de clunk, e a influência dos parâmetros do pré-amortecedor sobre ambos os fenômenos
Abstract: The development of new technologies on automotive engineering and the toughening emissions laws led to the design of lighter, more silent and more powerful vehicles. For this reason, today's powertrains are more prone to NVH phenomena. Furthermore, the noticeability of those phenomena is increased since newer engines produce lower noise levels. This is the subject in which this work fits into. It is known that many of the NVH phenomena can be attenuated by performing changes on the parameters of the clutch disc, and because of it, the influence of the parameters of the clutch damper on shuffle and clonk is studied in this work. For being a widely used procedure on the development of drivelines, a inear analysis is performed on a linearized model of a powertrain. After that, using umerical integration methods, further analyses are performed on a nonlinear model of the driveline, considering that the clutch disc and the gear meshes are nonlinearities. The latter's energy loss is modeled used impact damping. The geared pairs that contribute most for the clunk phenomenon are identified, and finally the influence of the parameters of the clutch damper on both phenomena are stated
Mestrado
Mecanica dos Sólidos e Projeto Mecanico
Mestre em Engenharia Mecânica
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Chevrié, Mathieu. "Modélisation électrothermique de composants électriques et électroniques automobiles et estimation des résistances de contact dans les connecteurs." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0079.
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Un connecteur électrique automobile est le siège de points de contact électriques soumis à des échauffements supplémentaires par effet Joule provoqués par leurs résistances de contact. La dégradation d’une résistance de contact peut provoquer des échauffements critiques au niveau des points de contact. La présente étude propose deux approches pour détecter les variations anormales des résistances de contact. La première, appliquée à un connecteur de boîtier électronique automobile, repose sur un diagnostic à base de modèle afin de détecter les variations anormales de la résistance de contact par rapport à sa valeur nominale. La seconde approche,appliquée à un connecteur de recharge de véhicule électrique, consiste d’abord à estimer un flux de chaleur lié à l’effet Joule provoqué par la résistance de contact. La valeur de cette dernière est ensuite estimée grâce à la méthode des moindres carrés. Ces deux approches reposent sur des modèles électrothermiques des connecteurs considérés et de leurs environnements. Cette étude présente également le développement de ces modèles, et notamment l’optimisation du maillage d’un fil électrique basée sur la minimisation de la norme H2 de l’erreur entre un modèle maillé d’ordre entier et un modèle analytique de référence d’ordre non entierAn automotive electrical connector contains electrical contact points subject to additional temperature rises by Joule effect caused by their contact resistances. The deterioration of a contact resistance can cause critical overheating at the contact points. This study proposes two approaches to detect abnormal changes in contact resistance. The first one, applied to an automotive electric case connector, relies on a model-based diagnosis to detect an abnormal variation in the contact resistance with respect to its nominal value. The second one, applied toan electric vehicle charging connector, consists in estimating a heat flow related to the Joule effect caused by the contact resistance. The value of the latter is then estimated using the least squares.These approaches rely on electrothermal models considered connectors and their environments.This study also presents the development of these models, including the optimization of the mesh of an electrical wire based on the minimization of the H2-norm of the error between ameshed integer order model and a reference analytical fractional order model
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Singh, Subrat, and Shreedhara Sreehari Veditherakal. "CAE modelling of cast aluminium in automotive structures." Thesis, Linköpings universitet, Mekanik och hållfasthetslära, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-162190.
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In the automobile industry, there is a big push for the automotive car manufacturers to base engineering decisions on the results of Computer Aided Engineering (CAE) solutions, and to transform the prototyping and testing, from a costly iterative process to a final verification and validation step. The variability in components material properties and environmental conditions together with the lack of knowledge about the underlying physics of complex systems often make it impractical to make reliable predictions based on only deterministic CAE models. One such area is the CAE modelling of cast aluminium components. These cast aluminium components have gained a huge relevance in the automobile industries due to their commendable mechanical properties. The advantage of the cast aluminium alloys are being a well-established alloy system in manufacturing processes, their functional integrity and relatively low weight. However, the presence of pores and micro-voids obtained during the manufacturing process constitutes a specific material behaviour and establishes a challenge in modelling of the cast materials. Furthermore, the low ductility of the materialdemands for the advanced numerical model to predict the failure. The main focus of this master thesis work is to investigate modelling technique of a cast aluminium alloy component, a spring tower, for a drop tower test and validate the predicted behaviour with the physical test results. Volvo Car Corporation currently uses a material model provided by MATFEM for cast aluminium parts which are explored in this thesis work, to validate the material model for component level testing. The methodology used to achieve this objective was to develop a boundary condition to perform component level tests in the drop tower and to correlate these with the obtained results found by using various modelling techniques in the explicit solver LS-DYNA. Therefore, precise and realistic modelling of the drop tower is crucial because the simulation results can be influenced by major design changes. A detailed finite element model for the spring tower has been developed from the observations made during the physical testing. The refined model showed good agreement with the existing model for the spring tower and observations from physical tests.
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Buey, Daniel. "Modeling non-basal deformation modes in Mg-Y and other Mg-RE alloys." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1532081086077038.
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Hoang, Trong bien. "Switched observers and input-delay compensation for anti-lock brake systems." Phd thesis, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-00994114.
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Many control algorithms for ABS systems have been proposed in the literature since the introduction of this equipment by Bosch in 1978. In general, one can divide these control algorithms into two different types: those based on a regulation logic with wheel acceleration thresholds that are used by most commercial ABS systems; and those based on wheel slip control that are preferred in the large majority of academic algorithms. Each approach has its pros and cons [Shida 2010]. Oversimplifying, one can say that the strength of the first ones is their robustness; while that of the latter ones their short braking distances (on dry grounds) and their absence of limit cycles. At the midpoint of this industry/academy dichotomy, based on the concept of extended braking stiffness (XBS), a quite different class of ABS control strategies has been proposed by several researchers (see, e.g., [Sugai 1999] and [Ono 2003]). This concept combines the advantages from both the industrial and academic approaches. Nevertheless, since the slope of the tyre characteristic is not directly measurable, it introduces the question of real-time XBS estimation. The first part of this thesis is devoted to the study of this estimation problem and to a generalization of the proposed technique to a larger class of systems. From the technological point of view, the design of ABS control systems is highly dependent on the ABS system characteristics and actuator performance. Current ABS control algorithms on passenger cars, for instance the Bosch ABS algorithm, are based on heuristics that are deeply associated to the hydraulic nature of the actuator. An interesting observation is that they seem to work properly only in the presence of a specific delay coming from the hydraulic actuation [Gerard 2012]. For brake systems that have different delays compared to those of hydraulic actuators, like electric in-wheel motors (with a smaller delay) or pneumatic trailer brakes (with a bigger delay), they might be no longer suitable [Miller 2013]. Therefore, adapting standard ABS algorithms to other advanced actuators becomes an imperative goal in the automobile industry. This goal can be reached by the compensation of the delays induced by actuators. The second part of this thesis is focused on this issue, and to the generalization of the proposed technique to a particular class of nonlinear systems. Throughout this thesis, we employ two different linearization techniques: the linearization of the error dynamics in the construction of model-based observers [Krener 1983] and the linearization based on restricted state feedback [Brockett 1979]. The former is one of the simplest ways to build an observer for dynamical systems with output and to analyze its convergence. The main idea is to transform the original nonlinear system via a coordinate change to a special form that admits an observer with a linear error dynamics and thus the observer gains can be easily computed to ensure the observer convergence. The latter is a classical method to control nonlinear systems by converting them into a controllable linear state equation via the cancellation of their nonlinearities. It is worth mentioning that existing results for observer design by error linearization in the literature are only applied to the case of regular time scalings ([Guay 2002] and [Respondek 2004]). The thesis shows how to extend them to the case of singular time scalings. Besides, the thesis combines the classical state feedback linearization with a new method for the input delay compensation to resolve the output tracking problem for restricted feedback linearizable systems with input delays.
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Olsson, Claes. "Active Vibration Control of Multibody Systems : Application to Automotive Design." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5818.
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Ånmark, Niclas. "Inclusion Characteristics and Their Link to Tool wear in Metal Cutting of Clean Steels Suitable for Automotive Applications." Licentiate thesis, KTH, Tillämpad processmetallurgi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-164875.
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This thesis covers some aspects of hard part turning of carburised steels using a poly‑crystalline cubic boron nitride (PCBN) cutting tool during fine machining. The emphasis is on the influence of the steel cleanliness and the characteristics of non‑metallic inclusions in the workpiece on the active wear mechanisms of the cutting tool. Four carburising steel grades suitable for automotive applications were included, including one that was Ca‑treated. A superior tool life was obtained when turning the Ca-treated steel. The superior machinability is associated with the deposition of lubricating (Mn,Ca)S and (CaO)x-Al2O3-S slag layers, which are formed on the rake face of the cutting tool during machining. Moreover, the transfer of work material to the rake face crater is characteristic in hard part turning of clean steels. It can be because of the lack of sulfides that protect the cutting edge when turning machinability treated steels. This corresponds to the more pronounced crater wear caused by the low‑sulfur steels than that of the steels with higher sulfur contents. It was also concluded that the composition of the non‑metallic inclusions in the Ca‑treated steel is a more important factor than the inclusion number and size, in hard part turning using a PCBN cutting tool. Also, a 3D analysis after electrolytic extraction was found to give a more precise characterisation of non‑metallic inclusions than the conventional 2D analysis by SEM‑EDS. In turn, better correlations to machinability and mechanical properties can be obtained. Hence, the use of this technique is beneficial for future material development. Finally, the challenge for future metallurgy is to manufacture high‑performance steels with improved combined properties of mechanical strength and machinability.QC 20150422
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Brubaker, Christopher L. "Dynamic Model of a Non-Linear Pneumatic Pressure Modulating Valve Using Bond Graphs." Cleveland State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=csu1432264539.
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Nguyen, Tran Anh-Tu. "Outils de commande avancés pour les applications automobiles." Thesis, Valenciennes, 2013. http://www.theses.fr/2013VALE0037/document.
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Cette thèse est consacrée au développement de techniques de commande avancées pour des classes de systèmes non linéaires en général et pour des applications automobiles en particulier.Pour répondre au besoin du contrôle moteur, la première partie propose des nouveaux résultats théoriques sur la technique de commande non linéaire à base de modèles de type Takagi-Sugeno soumis à la saturation de la commande. La saturation de la commande est traitée en utilisant sa représentation polytopique ou une stratégie anti-windup.La deuxième partie porte sur la commande du système d'air d'un moteur turbocompressé à allumage commandé. Deux approches originales sont proposées. Dans la première, l'outil théorique concernant les modèles Takagi-Sugeno à commutation développé dans la première partie est directement appliqué. La seconde approche est basée sur une commande linéarisante robuste. L'originalité de ces approches multivariables consiste dans sa simplicité de mise en œuvre et son efficacité par rapport à celles qui existent dans la littérature.La dernière partie vise à développer des stratégies pour la gestion énergétique des systèmes électriques d'un véhicule obtenues en se basant sur le Principe du Minimum de Pontryagin. À cet effet, deux approches sont considérées : l'approche hors ligne d'optimisation utilisant les informations du futur concernant les conditions de roulage et l'approche en ligne qui est adaptée de la précédente. Ensuite, ces deux approches sont implémentées et évaluées dans un simulateur avancéThis thesis addresses the development of some advanced control design tools for a class of nonlinear systems in general and for automotive systems in particular.Motivated by automotive applications, Part I proposes some novel theoretical results on control design for nonlinear systems under Takagi-Sugeno form subject to the control input saturation. The input saturation is dealt with by using its polytopic representation or an anti-windup strategy.Part II deals with our automotive application concerning the control of a turbocharged air system of a spark ignition engine. To this end, two novel control approaches are proposed in this part. For the first one, the theoretical design tool on switching Takagi-Sugeno controller developed in Part I is directly applied. The second one is based on a robust feedback linearization control technique. The originality of these MIMO approaches consist in their simplicity and effectiveness compared to other ones existing in the literature.Part III aims at developing the strategies, which are based on the Pontryagin's Minimum Principle in optimal control theory, for the energy management of the vehicular electric power systems in a hybrid engine configuration. To this end, both offline optimization approach using the future information of driving conditions and online implementable one have been developed and evaluated in an advanced simulator
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Bonnavion, Guillaume. "Dynamics of the unstable wake modes in automotive aerodynamics : from simplified models to real vehicles." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLY010/document.
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Depuis la découverte des modes asymétriques dans le sillage d'un corps simplifié d'automobile, réminiscents d'une bifurcation à bas nombre de Reynolds, se posent des questions propres au développement aérodynamique des véhicules terrestres telles que l'influence du vent latéral, de l'assiette et du rétreint d'arrière-corps couramment utilisé en phase d'optimisation. Notre travail s'attache à répondre expérimentalement à ces questions pour des géométries simplifiées mais aussi réelles. Les essais sont réalisés en soufflerie industrielle à l'échelle 2/5 pour le corps académique et en pleine échelle pour les monospaces. Nous montrons que le désalignement du véhicule par rapport à l'écoulement incident n'a pour effet que de modifier l'orientation du mode asymétrique sans en changer l'intensité. Nous construisons un modèle simple prédisant non seulement cette orientation mais aussi les conséquences sur les efforts aérodynamiques transverses. La contribution de l'instabilité sur les coefficients aérodynamiques de portance ou d'effort latéral est de l'ordre de 0,02 indépendamment du vent de travers et de l'assiette du véhicule. Les rétreints d'arrière-corps affectent également la dynamique du sillage et son orientation, mais l'instabilité n'est jamais supprimée. Ces résultats sont retrouvés pour des véhicules réels de type monospace dont le sillage est donc également soumis au même mode asymétrique, révélé sans ambigüité par des expériences de sensibilité en assiette. Nos résultats indiquent que, pour tous les véhicules considérés, le mode asymétrique de sillage est systématiquement présent dans l'enveloppe de conduite. Le contrôle ou la suppression de ce mode devrait offrir de nouvelles perspectives d'optimisation des véhicules à culot droit de type monospaces ou SUVSince the recent discovery of asymmetric modes in the wake of a simplified vehicle geometry, reminiscent from a bifurcation at low Reynolds numbers, some questions related to the aerodynamic development of ground vehicles such as the influence of lateral wind, pitch and afterbody boat-tail classically used during shape optimization remain unanswered. Our work is devoted to assess those questions experimentally for simplified but also real geometries. The tests are conducted in an industrial wind-tunnel, at the 2/5-scale for the academic body and at the full scale for the minivans. We show that the vehicle's misalignment only modifies the asymmetric mode's orientation without affecting its intensity. We build a model predicting not only this orientation but also the consequences on the cross-flow aerodynamic loading. The contribution of the instability to the lift or side force coefficients is of the order of 0,02 independently of lateral wind or of the vehicle's pitch. Afterbody boat-tails also impact the wake dynamics and its orientation but the instability is never suppressed. These results are retrieved for real vehicles such as minivans, whose wake is then subjected to the same asymmetric mode as well, revealed unambiguously with pitch sensitivity experiments. Our results indicate that, for all considered vehicles, the asymmetric wake mode is systematically present in the driving envelope. The control or the suppression of this mode should offer new optimization's perspectives for blunt based vehicles such as minivans or SUVs
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Vestin, Albin, and Gustav Strandberg. "Evaluation of Target Tracking Using Multiple Sensors and Non-Causal Algorithms." Thesis, Linköpings universitet, Reglerteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-160020.
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Today, the main research field for the automotive industry is to find solutions for active safety. In order to perceive the surrounding environment, tracking nearby traffic objects plays an important role. Validation of the tracking performance is often done in staged traffic scenarios, where additional sensors, mounted on the vehicles, are used to obtain their true positions and velocities. The difficulty of evaluating the tracking performance complicates its development. An alternative approach studied in this thesis, is to record sequences and use non-causal algorithms, such as smoothing, instead of filtering to estimate the true target states. With this method, validation data for online, causal, target tracking algorithms can be obtained for all traffic scenarios without the need of extra sensors. We investigate how non-causal algorithms affects the target tracking performance using multiple sensors and dynamic models of different complexity. This is done to evaluate real-time methods against estimates obtained from non-causal filtering. Two different measurement units, a monocular camera and a LIDAR sensor, and two dynamic models are evaluated and compared using both causal and non-causal methods. The system is tested in two single object scenarios where ground truth is available and in three multi object scenarios without ground truth. Results from the two single object scenarios shows that tracking using only a monocular camera performs poorly since it is unable to measure the distance to objects. Here, a complementary LIDAR sensor improves the tracking performance significantly. The dynamic models are shown to have a small impact on the tracking performance, while the non-causal application gives a distinct improvement when tracking objects at large distances. Since the sequence can be reversed, the non-causal estimates are propagated from more certain states when the target is closer to the ego vehicle. For multiple object tracking, we find that correct associations between measurements and tracks are crucial for improving the tracking performance with non-causal algorithms.
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Gstalter, Étienne. "Réduction d’ordre de modèle de crash automobile pour l’optimisation masse / prestations." Thesis, Compiègne, 2020. http://www.theses.fr/2020COMP2576.
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Cette thèse est une contribution à un thème de recherche sur les applications de la réduction de modèle à l’ingénierie RENAULT. Elle fait suite aux travaux du projet IRT SystemX ROM (Réduction de modèles et Optimisation Multidisciplinaire) et aux thèses CIFRE RENAULT [Vuong], [Charrier]. L’application industrielle principale du thème est la mise au point de la structure d’un véhicule sollicité en crash; des travaux sont également en cours sur la combustion, l’acoustique et l’aérodynamique. Les travaux de cette thèse sont à la fois un apport à la méthode générique ReCUR et son adaptation à l’optimisation de la caisse d’un véhicule pour le crash. RENAULT utilise largement l’optimisation pour la mise au point de la caisse en crash, avec un outil d’optimisation numérique basé sur la méthode des plans d’expériences. Cette méthode nécessite beaucoup de calculs crash car cette simulation est considérée comme une boite noire, en utilisant uniquement les entrées et sorties. La méthode ReCUR prend le contre-pied en exploitant un maximum d’informations de chaque simulation crash, dans le but de réduire fortement leur nombre. Les travaux de cette thèse ont permis de remplir cet objectif pour les applications de mise au point au nominal et pour l’optimisation robuste dans des cas complexes comme le choc frontal et arrièreThis thesis is a part of a global research work dedicated to reduced-order modelling applications in the Renault engineering direction. It's research topic has been improved in the IRT System)('s project on Reduced Order Model and Multi-disciplinary Optimization. Some previous thesis can help understand the context. ([Vuong], [Charrier]). The main industrial application of the research theme is the focus on a body structure, in a crash loading. Some research works on acoustic, combustion and aerodynamic are currently ongoing. This thesis is both a contribution to the generic ReCUR method, and its application to a car body structure optimization for crash loadings. Engineering teams at Renault uses optimization to obtain the best crash simulation, with a numerical optimization software, based on designs of experiments. It requires a lot of crash simulation because each simulation is considered as unique, with only one response for each parameter. Only Inputs and Outputs are known. The ReCUR method consider that each simulation is a huge mine that needs our attention. We hope that we can decrease the number of crash simulation required to compute a model, by using much more data for each simulation
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Bouvin, Jean-Louis. "Vers une version alternative à la suspension CRONE Hydractive." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0042/document.
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La suspension CRONE Hydractive, développée par l’équipe CRONE dans le cadre des suspensions de véhicules automobiles, présente des performances remarquables. En effet, l’association de l’approche CRONE, garantissant la robustesse du degré de stabilité aux variations de la masse suspendue, et de la stratégie Hydractive, permettant la commutation d’une architecture de suspension orientée confort vibratoire à une autre orientée comportement routier,permet la mise en défaut de la plupart des dilemmes inhérents aux architectures traditionnelles de suspension. La présente étude propose ainsi le développement d’une version alternative de la suspension CRONE par deux approches. Une première approche consiste en la mise en place d’une version passive métallique reposant sur l’utilisation des ressorts à lames en s’inscrivant dans une démarche de modernisation et d’optimisation des technologies historiques. La seconde approche, quant à elle, consiste à proposer le développement d’une version active pneumatique de la suspension CRONE. La modélisation complète de l’architecture « CRONE » orientée confort est alors proposée à travers celle de ses accumulateurs et gicleurs pneumatiques. Cette nouvelle version de suspension, en adoptant une technologie d’actualité de plus en plus répandue et pouvant bénéficier des développements du Véhicule Autonome Connecté, ouvre de nouvelles perspectives d’évolution de la suspension automobileThe Hydractive CRONE car suspension developed by the CRONE team provides outstanding performances. Indeed, the CRONE method ensures the robustness of the stability degree with respect to variations of the sprung mass, while the Hydractive strategy enables the switchover between a comfort-oriented architecture and a road-behavior-oriented one. The association of the CRONE method with the Hydractive strategy allows to circumvent most of the dilemmas that occur with traditional architecture suspensions. The present study aims to develop an alternative version of the CRONE suspension using two approaches. A first approach consists of the implementation of a passive metallic version based on leaf springs aiming the modernisation and optimisation of historical technologies. The second one, however, involves the use of a more relevant and increasingly widespread technology with the development of an active pneumatic version of the CRONE suspension. The complete modeling of the ``CRONE'' comfort-oriented architecture is then proposed through its pneumatic accumulators and nozzles. This new version, benefiting from the pneumatic active system and from the development of the Autonomous Connected Vehicle, opens up new prospects for the development of car suspensions
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Timpanaro, Anthony. "Reduction of NOx Emissions in a Single Cylinder Diesel Engine Using SNCR with In-Cylinder Injection of Aqueous Urea." UNF Digital Commons, 2019. https://digitalcommons.unf.edu/etd/876.
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The subject of this study is the effect of in-cylinder selective non-catalytic reduction (SNCR) of NOx emissions in diesel exhaust gas by means of direct injection of aqueous urea ((NH2)2CO) into the combustion chamber. A single cylinder diesel test engine was modified to accept an electronically controlled secondary common rail injection system to deliver the aqueous urea directly into the cylinder during engine operation.
Direct in-cylinder injection was chosen in order to ensure precise delivery of the reducing agent without the risk of any premature reactions taking place. Unlike direct in-cylinder injection of neat water, aqueous urea also works as a reducing agent by breaking down into ammonia (NH3) and Cyanuric Acid ((HOCN)3). These compounds serve as the primary reducing agents in the NOx reduction mechanism explored here. The main reducing agent, aqueous urea, was admixed with glycerol (C3H8O3) in an 80-20 ratio, by weight, to function as a lubricant for the secondary injector.
The aqueous urea injection timing and duration is critical to the reduction of NOx emissions due to the dependence of SNCR NOx reduction on critical factors such as temperature, pressure, reducing agent to NOx ratio, Oxygen and radical content, residence time and NH3 slip. From scoping engine tests at loads of 40 percent and 80 percent at 1500 rpm, an aqueous urea injection strategy was developed. The final injection strategy chosen was four molar ratios, 4.0, 2.0, 1.0 and 0.5 with five varying injection timings of 60, 20, 10, 0, and -30 degrees after top dead center (ATDC). In addition to the base line and aqueous urea tests, water injection and an 80-20 water-glycerol solution reduction agent tests were also conducted to compare the effects of said additives as well. The comparison of baseline and SNCR operation was expected to show that the urea acted as a reducing agent, lowering NOx emissions up to 100% (based on exhaust stream studies) in the diesel exhaust gas without the aid of a catalyst.
The data collected from the engine tests showed that the aqueous urea-glycerol solution secondary had no effect on the reduction of NOx and even resulted in an increase of up to 5% in some tests. This was due to the low average in-cylinder temperature as well as a short residence time, prohibiting the reduction reaction from taking place. The neat water and water-glycerol solution secondary injection was found to have a reduction effect of up to 59% on NOx production in the emissions due to the evaporative cooling effect and increased heat capacity of the water.
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Montello, Aaron David. "An Experimental Investigation of Water Droplet Growth, Deformation Dynamics and Detachment in a Non-Reacting PEM Fuel Cell via Fluorescence Photometry." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1228248650.
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Glos, Jan. "Modelování a řízení toků elektrické a tepelné energie v plně elektrických automobilech." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-433039.
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Systematické řízení tepelných a elektrických toků v plně elektrických automobilech se stává velmi důležitým, protože v těchto typech automobilů není k dispozici dostatek odpadního tepla pro vytápění kabiny. Aby v zimním období nedocházelo ke snížení dojezdu, je nutné použití technologií, které umožní snížení spotřeby energie nutné k vytápění kabiny (např. tepelné čerpadlo, zásobník tepla). Je také zapotřebí vytvořit řídicí algoritmy pro tato zařízení, aby byl zajištěn jejich optimální provoz. V letním období je nezbytné řídit tepelné toky v rámci elektromobilu tak, aby nedocházelo k nadměrnému vybíjení baterie kvůli chlazení kabiny a dalších částí. Tato práce řeší jak návrh řídicích algoritmů, tak i vývoj rozhodovacího algoritmu, který zajistí směřování tepelných toků.
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Neudorf, Thelma Katherine. "Non-contact Measurement of Dynamic Belt Span Tension in Automotive FEAD Systems." Thesis, 2013. http://hdl.handle.net/1807/43268.
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The proposed tension measurement method focuses on measurement of tension in a single
belt span of the multi-pulley Front End Accessory Drive (FEAD) system. The mean
belt span tension is calculated from the measured belt span natural vibration frequency. The oscillation belt span tension is calculated from the measured belt span transverse displacement. The dynamic belt span tension is calculated using the mean and oscillation tensions, belt span support pulley rotations, and belt slip, where the slip equation is based on Euler's equation. The proposed tension measurement method is validated using an experimental testing FEAD system which consists of a five pulley system and an automatic tensioner arm. Non-contact sensors are used to prevent disruption of the
typical system behaviour. Testing conditions simulate typical engine crankshaft rotation
input. Results from experimental testing consistently produce results with percent error less than 10 % for mean and maximum belt span dynamic tension.
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Aliabbasi, Pedram. "Increasing Development Efficiency Using Virtual Prototyping in Automotive Domain: AUTOSAR-based and non-AUTOSAR ECUs." 2018. https://monarch.qucosa.de/id/qucosa%3A32949.
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The automotive industry is experiencing a rapid increase in software complexity due to various functionalities introduced into modern vehicles. Companies use software development standards like AUTOSAR to develop the application layer software independent from the hardware. Development methodologies such as Model-Based Design are used to increase the efficiency of the development process and decrease the time to market. However, to ensure high-quality software standards such as A-SPICE are imposed on the companies. Conforming to A-SPICE requires having certain traceability between work artifacts. Thus, manual and inefficient development, testing, and requirement management processes lead to higher time to market. This thesis will introduce the concept of virtual validation using VEOS virtual platform from dSPACE. The new toolchain will focus on automatizing the testing process, requirement management, and report generation. To highlight the benefits of the virtual validation concept this new approach will be compared to the existing one, which includes a lot of manual development steps. Besides the application of the virtual validation with AUTOSAR and non-AUTOSAR software architectures will be discussed.
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NUNG, WU PEI, and 吳佩濃. "A Study of The Impact of Non-economic Factors on Stock Market- The Case of Japan Earthquake in Taiwan' Automotive Industry." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/92677372983346665077.
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碩士開南大學
會計學系
99
The aim of this study is to discuss the chain reaction caused by a great earthquake happened in the world’s third largest economic system. As many Taiwanese automotive materials are provided by Japan, and the earthquake in Japan stop the transportation from the disaster area to airport, thus it may result in problem in the production line. However, whether the public investors reflect this news on the stock price, then to observe whether Taiwan is an efficiency market and verify whether Japan’s great earthquake impact the stock price of Taiwan’s automotive industry. This study uses the event study method from Taiwan Economic Journal (TEJ) to discuss whether abnormal returns and cumulative abnormal returns occur in automobile industry’s stock price, and then we proceed to use traditional method and cross-sectional method to verify whether the impact is significant. This study will discuss the five listed automobile companies in Taiwan: Yulong, China, Sanyang, Hotai and Yulon Nissan Motor.