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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

An Assessment Study of Automotive Engine Carbon Removal Technology

Chiu, Ting-Cheng 17 July 2010 (has links)
Human large-scale use of coal, oil, natural gas and other fossil fuels, which emit large quantities of energy use is caused by the greenhouse effect of greenhouse gases, including carbon dioxide increases rapidly, is the culprit of global warming. Man type and species of global warming has brought the threat of the living environment, how to effectively slow down global warming has become the man to face critical issues. According to Taiwan's greenhouse gas emissions from all sectors data show that the transport sector with a significant contribution to greenhouse gas emissions, developed with the vehicle industry, motor vehicles have become the main transport means of transport to daily life, but also resulted in major metropolitan areas and air pollution from carbon dioxide, improve air quality and reduce carbon emissions, should have to be propaganda vehicle maintenance and regular inspection of work, vehicle maintenance facilities for the engine than coke will effectively reduce unnecessary vehicle emissions and pollution, with a view to sustainable human development. This study to collect relevant information through expert interviews, sorting out the market viability of the Automotive engine carbon removal methods are "bubble-type engine than coke," the "trickle engine program than coke" and "In addition to product hydrogen aircraft engine Carbon Programme "of three. And to identify factors that impact assessment, "the cost of implementation", "when applied to pollution assessment," "clear the effect of coke", "engine damage effects" and "ease of handling," and five. Main and analytic theory, experts in the field to conduct the carbon removal of the vehicle engine is assessed for the valid questionnaires, the use of AHP Analysis Method Comparison of the order of priority or importance, to find consistency through the whole management of the common point of view. Comprehensive management and access to the whole study found that industry, government, science and other 12 experts were assessing the overall level of the importance of the five ranking for the "impact of engine damage," the most important, were "clear the effect of coke," " when applied to pollution assessment, "" implementation costs "," easy operation "of the last. The engine in the current market feasible than carbon technology, the experts unanimously agree that the "hydrogen aircraft engine program than coke," the most advantage of the actual promotion of environmental protection that, the Government Ying Ying Zao Leung good conduct political Peihehuanjing, provide economic incentives to encourage people to Automotive engine carbon removal and counseling industry to promote environmental protection measures. The research results could serve as references for the Government's future vehicles and the carbon reduction policies.
2

Gestão da qualidade em cadeias de suprimentos do segmento de motores de automóveis / QUALITY MANAGEMENT IN SUPPLY CHAINS OF THE AUTOMOTIVE ENGINE SECTOR

Zagha, Roberta Resende 18 February 2009 (has links)
Made available in DSpace on 2016-06-02T19:50:05Z (GMT). No. of bitstreams: 1 2498.pdf: 1481594 bytes, checksum: 9e2efd96019ab6ba5cb24bed7ddec0b9 (MD5) Previous issue date: 2009-02-18 / This work seeks to identify and analyze the quality management forms adopted by two engine assemblers and by nine of their first and second tier suppliers, discussing the relationships between the quality management form implemented by each assembler and the ones implemented by its suppliers in each supply chain studied. In a second moment, this work compares the two sets of quality management forms adopted in those two supply chains. Three hypotheses orient this research: the two engine assemblers adopt different quality management forms; the suppliers of those engine assemblers adopt different quality management forms as well; the two sets of quality management forms adopted in those supply chains are different, since the distinct quality management forms implemented by the assemblers and by their respective suppliers are conditioned by different supply chain structures and relationships. This work is accomplished through some literature revisions on the topics associated to the mentioned subject and secondly through a field research that involves case studies carried out in two supply chains. These two supply chains have different configurations: they are headed by two engine assemblers that present distinct levels of vertical integration and have different types of relationships with their respective suppliers. In each one of the analyzed companies two engine assemblers and nine suppliers (from the first and the second tiers) some semi-structured interviews were realized. The results indicate that the quality management forms implemented by the two engine assemblers are very similar. They indicate as well that the adoption of the conception main principles and guidelines of the Total Quality Management by all suppliers assures certain resemblance amongst the quality management forms implemented by them. But there are indications that the adopted forms by the suppliers are different, being the most sophisticated practices implemented by the multinational suppliers. It is observed an association between the differences in the supply chain structures and relationships and the differences in the two sets of quality management forms adopted (in the two chains). The supply chain in that the assembler has a higher degree of outsourcing and a bigger proportion (and absolute number) of smaller and national capital suppliers, with the goal of having cost advantages (with lower prices and lower transport costs), must, in compensation, spend bigger effort to guarantee the quality of the components it acquires. The chains characterized by engine assemblers having fewer suppliers are usually noticeable by long term relationships, with a greater number of large-sized suppliers, more technologically capable (generally multinationals companies certified according to quality standards), must make a relatively bigger effort to negotiate with suppliers, but a much lower effort to develop them. / Este trabalho tem por objetivo geral identificar e analisar as formas de gestão da qualidade de duas montadoras de motores e de nove de seus fornecedores de primeiro e segundo níveis, discutindo as relações entre as formas de gestão da qualidade de cada montadora e de seus fornecedores em cada uma das cadeias produtivas estudadas e, em um segundo momento, comparando os dois conjuntos (combinações) de formas de gestão da qualidade adotadas nessas cadeias. Foram delineadas três hipóteses para orientar a pesquisa: as montadoras de motores de automóveis possuem diferentes formas de gestão da qualidade; os fornecedores das montadoras de motores de automóveis possuem diferentes formas de gestão da qualidade; os conjuntos de formas de gestão da qualidade nas cadeias de montadoras de motores de automóveis são diferentes, pois as distintas formas de gestão da qualidade adotadas pelas montadoras e por seus respectivos fornecedores são ainda condicionadas por estruturas e as relações diferentes das duas cadeias de suprimentos. A pesquisa apóia-se em revisões bibliográficas realizadas acerca dos tópicos associados ao tema e em uma pesquisa de campo que envolve estudos de caso em duas cadeias com configurações diferentes: comandadas por duas montadoras de motores que apresentam níveis de integração vertical e relações com fornecedores distintos. Em cada uma das empresas analisadas duas montadoras e nove fornecedores (de primeiro e segundo níveis) foram realizados estudos fundamentados em entrevistas semi-estruturadas. Os resultados indicam que as formas de Gestão da Qualidade das duas montadoras são muito semelhantes. Indicam também que a adoção pelos fornecedores da concepção da Gestão da Qualidade Total seus princípios e diretrizes principais assegura certa semelhança entre as formas de gestão por eles adotadas. Mas há indícios de que as formas adotadas pelos fornecedores são diferentes, sendo os conjuntos mais sofisticados de práticas adotadas pelos fornecedores multinacionais. Observou-se uma correspondência (associação) entre as diferenças nas estruturas e relações das cadeias e as diferenças nos conjuntos de formas de gestão da qualidade adotados (nas duas cadeias). A cadeia em que a montadora possui grau mais elevado de terceirização e número e proporção maior de fornecedores de menor porte e de capital nacional, para auferir vantagens de custo (preço e transporte dos componentes), deve, em contrapartida, despender esforço maior para garantir a qualidade dos componentes que adquire. Já a cadeia em que a montadora possui um número menor de fornecedores, estabelecendo relações de longo prazo, possuindo uma proporção maior de fornecedores de grande porte e mais capacitados tecnologicamente (preferencialmente empresas multinacionais e certificadas em normas da qualidade), deve despender esforços relativamente maiores nas negociações com fornecedores, mas seu esforço para desenvolvê-los é muito menor.
3

Contributions to Engineering Big Data Transformation, Visualisation and Analytics. Adapted Knowledge Discovery Techniques for Multiple Inconsistent Heterogeneous Data in the Domain of Engine Testing

Jenkins, Natasha N. January 2022 (has links)
In the automotive sector, engine testing generates vast data volumes that are mainly beneficial to requesting engineers. However, these tests are often not revisited for further analysis due to inconsistent data quality and a lack of structured assessment methods. Moreover, the absence of a tailored knowledge discovery process hinders effective preprocessing, transformation, analytics, and visualization of data, restricting the potential for historical data insights. Another challenge arises from the heterogeneous nature of test structures, resulting in varying measurements, data types, and contextual requirements across different engine test datasets. This thesis aims to overcome these obstacles by introducing a specialized knowledge discovery approach for the distinctive Multiple Inconsistent Heterogeneous Data (MIHData) format characteristic of engine testing. The proposed methods include adapting data quality assessment and reporting, classifying engine types through compositional features, employing modified dendrogram similarity measures for classification, performing customized feature extraction, transformation, and structuring, generating and manipulating synthetic images to enhance data visualization, and applying adapted list-based indexing for multivariate engine test summary data searches. The thesis demonstrates how these techniques enable exploratory analysis, visualization, and classification, presenting a practical framework to extract meaningful insights from historical data within the engineering domain. The ultimate objective is to facilitate the reuse of past data resources, contributing to informed decision-making processes and enhancing comprehension within the automotive industry. Through its focus on data quality, heterogeneity, and knowledge discovery, this research establishes a foundation for optimized utilization of historical Engine Test Data (ETD) for improved insights. / Soroptimist International Bradford
4

Outils de commande avancés pour les applications automobiles / Advanced control design tools for automotive applications

Nguyen, Tran Anh-Tu 02 December 2013 (has links)
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 avancé. / This 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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