Dissertations / Theses on the topic 'Diesel motor Mathematical models'
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Chin, Chi-pang Henry, and 錢志鵬. "Receptor modelling of particulates pollution in Hong Kong by chemical mass balance." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31253696.
Full textMazzetti, Caterina. "A mathematical model of the motor cortex." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/15002/.
Full textVora, Kuntal A. "Cycles and weight effects on emissions and development of predictive emissions models for heavy duty trucks." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4700.
Full textTitle from document title page. Document formatted into pages; contains xiii, 85 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 82-84).
Zhang, Chunlei, and 张春雷. "Multiscale modeling of the flagellar motor of Escherichia coli." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/193497.
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Chemistry
Doctoral
Doctor of Philosophy
Knight, Peter Robin. "Artificial intelligence and mathematical models for intelligent management of aircraft data." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/355717/.
Full textNa, Xiaoxiang. "Game theoretical modelling of a driver's interaction with active steering." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708392.
Full textKaram, Philippe Chucri. "Modeling passive and active mechanisms in motoneuron dendrites." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/13713.
Full textJuston, John M. "Theoretical and experimental study into the dynamics and control of a flexible beam with a DC-servo motor actuator." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/50029.
Full textMaster of Science
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Watanabe, Renato Naville. "Identificação de sistemas para o estudo de controle motor." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-27062016-162303/.
Full textAny active motor task is accomplished by the activation of a motor unit population. However, due to many ethical and technical difficulties the synaptic input to the motoneurons cannot be measured in humans. For these reasons realistic computational models of a motoneuron nucleus and the innervated muscle fibers have an important role in the study of the human control of muscles. However such models are complex and their mathematical analysis is difficult. In this text a system identification approach of a realistic motor unit nucleus model is presented with the objective of obtaining a simpler model capable of representing the transduction of the motor unit nucleus inputs into the muscle force signal associated to that nucleus. The system identification was based on an orthogonal least squares algorithm to find a NARMAX model, the input being the net dendritic excitatory synaptic conductance of the motoneurons and the output being the muscle force signal produced by the motor unit nucleus. The identified model output reproduced the mean behavior of the output from the realistic computational model even for input-output signal pairs not used during the identification process, such as sinusoidally modulated output muscle force signals. Generalized frequency response functions of the motoneuron nucleus were obtained from the identified NARMAX model, and led to an inference that cortical oscillations in the beta band (20 Hz) can affect force control by the spinal cord, an unknown motoneuron nucleus behavior until now.
Lindgren, Magnus. "Engine exhaust gas emissions from non-road mobile machinery : effects of transient load conditions /." Uppsala : Dept. of Biometry and Engineering, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/a481.pdf.
Full textIerardi, James A. "A computer model of fire spread from engine to passenger compartments in post-collision vehicles." Link to electronic version, 1999. http://www.wpi.edu/Pubs/ETD/Available/etd-052499-135914/unrestricted/thesis.pdf.
Full textGuzzomi, Andrew Louis. "Torsional vibration of powertrains : an investigation of some common assumptions." University of Western Australia. School of Mechanical Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0032.
Full textPereira, Valmir Machado. "Modelo e analise do motor de indução bifasico assimetrico com o estator conectado em T." [s.n.], 1996. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258916.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: Esta dissertação tem o objetivo de determinar um modelo matemático para o motor de indução bifásico assimétrico com os enrolamentos de estator conectados em T e investigar algumas propriedades tais como aceleração livre, característica estática conjugado-velocidade e as correntes em regime permanente. Este motor é projetado para ser alimentado a partir de duas fases e do neutro, e requer um valor particular para a relação de espiras entre os enrolamentos do estator. Inicialmente, uma transformação de variáveis é realizada com a finalidade de encontrar um motor equivalente que não possua nenhum ponto condutivo comum entre os enrolamentos e que apresente a mesma fm.m do motor original. Fazendo uso do conceito de circuitos acoplados são obtidas as equações básicas. A seguir, essas variáveis são escritas no sistema de referência estacionário e um circuito equivalente é obtido. Utilizando esse circuito equivalente, são apresentados resultados de simulação computacional e resultados de testes experimentais.A comparação dos mesmos exibiram uma boa concordância,mostrando que o modelo matemático é adequado
Abstract: This dissertation has the aim of determining a mathematical model for asymmetrical two-phase induction motor with T-connected stator windings and to investigate some properties such as free acceleration, steady-state torque-speed characteristic and steady-state currents. This motor is designed to operate from supply of two phases and neutral, and a particular value for the stator tums ratio is required. First, a transformation of variables is accomplishedto obtain an equivalent motor that do not have electric connection and that presents the same m.m.f. of original motor. Making use of the concept couple circuits, the basic equations are derived. Second, these variables are written in the stationary referencefTameand an equivalentcircuit is obtained. By using this equivalent circuit, computer simulationis presented and compared with experimental results. The tests exhibited a good agreement, showing that the mathematical model is adequate
Mestrado
Mestre em Engenharia Elétrica
Riechel, Andrew T. "Force-Feasible Workspace Analysis and Motor Mount Disturbance Compensation for Point-Mass Cable Robots." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5243.
Full textPedchote, C. "Parameter estimation for non-linear systems: an application to vehicle dynamics." Thesis, Engineering Systems Department, 2009. http://hdl.handle.net/1826/3896.
Full textPedchote, Chamnarn. "Parameter estimation for non-linear systems : an application to vehicle dynamics." Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/3896.
Full textHallmark, Shauna L. "Analysis and prediction of individual vehicle activity for microscopic traffic modeling." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/20736.
Full textLuque, Carcasi Diodomiro Baldomero 1974. "Modelagem matematica para avaliação do comportamento eletrico de motores de indução trifasicos em regime permanente : um modelo neural." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261380.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e Computação
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Resumo: Este trabalho apresenta um estudo sobre o comportamento de motores de indução trifásico em regime permanente. Discute-se a validade da utilização do circuito elétrico equivalente do motor nas condições nominais e fora das condições nominais de operação. Ensaios em vazio e com rotor bloqueado são executados em um motor de indução trifásico para a determinação dos parâmetros do circuito equivalente. O ensaio realizado em condições de carga variável dentro de um intervalo usual de operação do motor, em termos de escorregamento, mostra que o circuito equivalente não representa o comportamento da máquina quando esta trabalha fora do ponto nominal de operação, porque os parâmetros não mais o representam bem naquelas situações de operação. As grandezas obtidas nos ensaios em carga variável são adequadamente condicionadas e utilizadas no treinamento de uma rede neural artificial Multi-Layer Perceptron (MLP). Para a validação dessa rede são comparados os resultados obtidos no modelo neural com os testes experimentais do motor de indução trifásico.
Abstract: This thesis presents a study about the steady state behavior of the three-phase induction motor. The validity of the use of the electric equivalent circuit is discussed when it is utilized on the rated conditions and also on any other operating conditions. No-load and the blocked rotor tests are performed on a three-phase induction motor for the determination of the equivalent circuit parameters. The tests run in variable load conditions in a usual interval of operation of the motor, in terms of slip, show that the equivalent circuit does not represent quit well the behavior of the machine when it works out of the rated point, because the parameters do not represent it in those operating condition any more. The magnitudes obtained in the variable load test are conditioned and used in the training of an artificial neural network Multi-Layer Perceptron (MLP). For the validation of the results, the neural model and experimental tests of the induction motor results are compared.
Mestrado
Automação
Mestre em Engenharia Elétrica
MacFarlane, Gregory Stuart. "Using big data to model travel behavior: applications to vehicle ownership and willingness-to-pay for transit accessibility." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51804.
Full textSantos, Bruno Samways dos. "Programação de ônibus interurbano utilizando a técnica de programação linear inteira." Universidade Tecnológica Federal do Paraná, 2014. http://repositorio.utfpr.edu.br/jspui/handle/1/929.
Full textO transporte rodoviário é um dos modais mais utilizados para o transporte de passageiros principalmente devido à sua acessibilidade, tanto no contexto nacional como mundial. As organizações buscam métodos e sistemas cada vez mais eficientes para atender de forma satisfatória seus clientes, oferencendo serviços de qualidade e confiáveis. O presente trabalho teve como objetivo propor um modelo matemático de veículos para a minimização de ônibus, evitando ao máximo o desbalanceamento da rede de transporte. O modelo buscou abranger as restrições inerentes aos fluxos em rodoviárias de modo a cobrir todas as viagens de uma tabela de horários já definida, alocando apenas um veículo para cada viagem e aproveitando o mesmo para outras viagens quando possível, atendendo à função objetivo. O modelo foi aplicado à uma empresa de transportes de passageiros com quatro cidades envolvidas e 105 viagens em um tempo de 24 horas. As variáveis e restrições foram identificadas a partir de entrevistas semi -estruturadas e visitas à organização, observando roteiros de viagens a serem cumpridos por dois modelos de ônibus: metropolitanos e articulados. Neste contexto, dois modelos distintos foram montados de forma a atender as viagens, sendo analisadas separadamente. Os resultados definiram um total necessário de 12 ônibus metropolitanos e 4 ônibus articulados para atender às exigências da empresa e da tabela viagens, sendo que todas as restrições foram satisfeitas, detectando -se a necessidade da realização de seis viagens mortas (sem passageiros) para suprir a necessidade de d emanda de ônibus para cada tabela de viagens diárias. Com os resultados, fez-se uma comparação com a programação que a empresa necessitava para cumprir a tabela de viagens, identificando a diminuição de um ônibus metropolitano, sem deixar de cumprir a restrição de autonomia de cada ônibus poder rodar 400 quilômetros sem necessidade de reabastecimento. Algumas melhorias foram identificadasanalisando-se a rede resultante, sendo discutidas ao final da pesquisa e norteando novas intenções de trabalhos futuros.
Road transport is one of the most used modes for passenger transport mainly due to its affordability, in the national and global context. Organizations seek for a better methods and systems to meet the satisfaction of its customers, offering quality and reliable services. This research aimed to propose a vehicle scheduling model to minimize buses, avoiding the transmission system imbalance. The model tried to cover the restrictions inherent about the vehicle flow on bus stations to cover all travel in a given timetable, allocating only one vehicle for each trip and using it for other trips when it is possible, given the objective function. The model was applied to a passenger transportation company with four cities involved and 105 trips in a time of 24 hours. The variables and constraints were identified from semi-structured interviews and visits at organization, identifying the tours to be met by two bus models: articulated and metropolitan. In this context, two different models were fitted to meet the travel , and analyzed separately. The results defined a required total of twelve metropolitan buses and four articulated buses to meet the company and timetable requirements and all constraints were satisfied, detecting the need of perform six deadheading trips (without passengers) to meet the need for demand bus for each table in the daily trips. With the results, a comparison was made between the old programming system adopted by the organization to fulfill the timetable, identifying the reduction of a metropolitan bus, while fulfilling the constraint of autonomy that each bus can travel 400 kilometers. Some improvements were identified by observing the resulting route network, being discussed at the end of the research and guiding for a new works in the future.
Nevot, Cercós Javier. "Diseño de un controlador avanzado basado en redes neuronales para la gestión de la mezcla aire-gasolina en un motor alternativo." Doctoral thesis, Universitat Politècnica de Catalunya, 2000. http://hdl.handle.net/10803/5933.
Full textPara evitar estos problemas se ha diseñado un modelo matemático de un motor, que comprende todo el proceso de formación de la mezcla, sensores, la generación del par motor y la dinámica del vehículo. La realización final se ha realizado en el lenguaje de simulación MatLab/Simulink®. Los datos requeridos son fácilmente obtenibles bien por metrología, bien de forma experimental. Se ha validado con un motor SEAT de 1,6 l y 74 kW.
Como primer paso se ha aplicado una estrategia de control convencional bastante simple, consistente en un controlador feedforward estático, más un controlador feedback de tipo PI ó PID. Esto ha permitido el estudio de las principales características del motor desde el punto de vista de control.
Con los resultados obtenidos se ha diseñado un observador basado en una red neuronal, que elimine los retardos puros del sistema y que pueda ser utilizado para cerrar el lazo de control. Primero se ha usado una red feedforward, pero vistos los malos resultados, se ha desarrollado una red neuronal recurrente a partir de la red de Elman, que se ha modificado convenientemente para adaptarla a las dificultades propias del problema. El algoritmo de entrenamiento utilizado se basa en el de retropropagación clásico, y modifica no sólo los pesos entre capas, sino también los correspondientes a las neuronas de contexto, las cuales permiten memorizar estados internos. La principal mejora consiste en separar las neuronas de contexto en tantos grupos como entradas tiene la red, y entrenarlos por separado, de modo que cada grupo se adapte a la dinámica particular de la entrada a la que va asociado. Se muestra mediante simulación el comportamiento del conjunto motor más observador en lazo cerrado, y se compara con el esquema convencional. Se prueba asimismo la robustez del sistema frente a distintas consignas, ruido en la planta y defectos de sintonía.
In the present thesis a control system for the air-fuel mixture in a reciprocating four-stroke engine is developed, based on neural networks. The air-fuel ratio has to be kept within a very narrow window so that the catalyst achieves an acceptable degree of purification simultaneously with all the polluting gases. In steady state, this goal can be fulfilled without difficulties, but the usual operation of a vehicle is in a very transient state, where the conventional systems are not able to avoid important excursions from the set point. They also rely on a great number of look-up tables, which have to be tuned experimentally, thus with an enormous investment of money and time.
To avoid those problems a mathematical model of an engine has been designed, in such a way that it comprises of the whole mixture formation process, sensors, the torque generation and the vehicle dynamics. Finally it has been implemented in the simulation language MatLab/Simulink®. The required data is easily available both from metrology, and experimental work. It has been validated with a 1,6 litre 74 kW SEAT engine.
As a first step, a quite simple conventional control strategy has been applied, consisting of a static feedforward controller, and a PI or PID feedback controller. This has permitted studying the main features of the engine from the control point of view.
With the obtained results an observer based on a neural network has been designed, which eliminates the delays of the system and that can be used to close the control loop. First a feedforward network has been used, but due to the bad results, a recurrent neural network has been developed starting from the Elman network, which has been properly modified in order to adapt it to the characteristic difficulties of the problem. The training algorithm used is based on that of classical backpropagation, and it modifies not only the weights interconnecting different layers, but also those corresponding to the context neurons, which allow the memorising of internal states. The main improvement consists in separating the context neurons in as many groups as the network has inputs, and to train them separately, so that each group adapts to the particular dynamics of the input with which it is associated. The behaviour of the engine plus the observer in closed loop is shown by means of simulation, and is compared with the conventional scheme. It is proven the robustness of system response to different set points, noise in the plant and tuning defects.
Johnson, Lynne Alison. "Modelling particle emissions from traffic flows." Thesis, Queensland University of Technology, 2000.
Find full textКраснов, Роман Володимирович, Роман Владимирович Краснов, and Roman V. Krasnov. "Підвищення надійності електродвигунів компресорів електропоїздів постійного струму." Thesis, Видавництво Дніпропетровського національного університету залізничного транспорту імені академіка В. Лазаряна, 2012. http://eadnurt.diit.edu.ua:82/jspui/handle/123456789/1227.
Full textUK: АНОТАЦІЯ Дисертація присвячена підвищенню надійності електродвигунів компресорів електрорухомого складу шляхом забезпечення нормованих значень нагрівання ізоляції в реальних умовах експлуатації і удосконалення системи захисту якірно-го кола електродвигуна від надмірних струмів, які можуть викликати нагрівання ізоляції більше допустимих значень. Пропонується, на відміну від попередніх досліджень, процес пуску розгля-дати таким, що складається з двох етапів. В роботі проведено дослідження по визначенню значень струмів на кожному з цих етапів і впливу тривалості етапів на нагрівання ізоляції. Для теоретичних досліджень автором запропонована ма-тематична модель, адекватність якої підтверджена тим, що різниця між параме-трами, які отримані з допомогою цієї моделі та експериментально (шляхом ос-цилографування), знаходиться в межах до 5 %. Отримані залежності тривалості першого та другого етапів пуску, а також значень струму якоря на цих етапах при різних умовах: різних значеннях на-пруги в контактній мережі, температурі навколишнього середовища, тиску в пневмомережі та значенням моменту на валу двигуна після закінчення пуску. Експериментально та теоретично доведено, що в окремих випадках захист електродвигуна з допомогою теплового реле ТРВ-8,5 не забезпечується. З допомогою теплової моделі досліджені процеси нагрівання ізоляції обмо-тки якоря під час пуску та подальшої роботи електродвигуна компресора при різних можливих режимах та умовах. Результати досліджень, що отримані за допомогою математичної та тепло-вої моделей використані для програмування нового пристрою захисту електро-двигуна компресора від перенавантажень. Запропонований пристрій захисту безвідмовно протягом декількох років працює на реальному електропоїзді. RU: АННОТАЦИЯ Диссертация посвящена повышению надежности электродвигателей ком-прессоров электроподвижного состава путём обеспечения рациональных значе-ний нагревания изоляции в реальных условиях эксплуатации и усовершенство-вания системы защиты якорной цепи электродвигателя от чрезмерных токов, которые могут вызвать нагревание изоляции больше нормированных значений. Проведен анализ выхода из строя электродвигателей компрессоров на электропоездах постоянного тока серии ЭР-1, 2 по причине пробоя изоляции обмоток якоря и полюсов. Как показывает обзор литературы по теме диссерта-ционной работы, проведенный автором, до теперешнего времени влияние про-цесса пуска на нагревание изоляции обмоток якоря и полюсов в полной мере не исследовано, особенно это относится к рассмотрению процесса пуска как тако-вого. Автор, в отличие от предыдущих исследований, предлагает процесс пуска рассматривать состоящим из двух этапов. Первый этап пуска – напряжение на электродвигатель подано, а его вал не вращается в течении некоторого времени. Второй этап – вал электродвигателя трогается и начинает набирать обороты до установившегося значения угловой скорости. В работе проведено исследование по определению значений токов на каж-дом из этих этапов и влиянию длительности этапов на нагревание изоляции. Для этого вначале проведено экспериментальное исследование процессов пуска электродвигателя компрессора на реальном электропоезде путем осциллогра-фирования этого процесса с помощью современного измерительного комплекса с исользованием датчиков напряжения (тип LEM CV4-6000) и тока (тип LEM LT100-8/SP30). Для теоретических исследований автором предложена математическая мо-дель, адекватность которой подтверждена тем, что расхождение параметров, полученных путем осциллографирования и с помощью математической модели находится в пределах до 5 %. Для получения численных значений при исследо-вании процессов пуска на указанных двух этапах с помощью математической модели используется метод Рунге-Кутта-Фелберга. Получены зависимости тока якоря на первом и втором этапах пуска при разных условиях: разных значениях напряжения в контактной сети, температу-ры окружающей среды, давления в пневматической сети. Получены также зависимости длительности первого и второго этапов пус-ка от указанных условий. Установлено, что в реальных условиях эксплуатации длительность первого этапа пуска составляет от 19 до 74 мс, однако, несмотря на относительно малое значение, токи, возникающие на первом этапе, существенно влияют на эффек-тивное значение тока за всё время пуска и соответственно существенно влияют на нагревание изоляции. Так увеличение длительности первого этапа пуска до 30 % по сравнению с пуском электродвигателя при номинальном напряжении в контактной сети и нормальных внешних условиях увеличивает эквивалентный ток за всё время пуска до 9,1 %. Установлены зависимости между длительностью первого этапа и значени-ем момента на валу двигателя после окончания пуска. Экспериментальные и теоретические исследования показали, что в отдель-ных случаях защита электродвигателя с помощью теплового реле ТРВ-8,5 не обеспечивается. С помощью тепловой модели исследованы процессы нагревания изоляции обмотки якоря во время пуска и дальнейшей работы электродвигателя компрес-сора при номинальной нагрузке на его валу и при бо́льших нагрузках, что воз-можно при реальных условиях эксплуатации. Доказано, что в эксплуатации возможны режимы работы, при которых из – за перегрева изоляции срок её службы снижается до 4,8 лет, что соответствует статистическим данным. Установлена зависимость времени, за которое протекание тока определён-ного значения приводит к максимально допустимому нормированному нагре-ванию изоляции обмоток якоря от этого тока при наиболее неблагоприятной температуре окружающей среды – +40 ˚С. Эта зависимость использована для программирования предложенного автором нового устройства защиты якорных цепей на базе современных микроконтроллеров. Предложенное автором устройство защиты от перегрузок электродвигателя компрессора безотказно в течение нескольких лет работает на реальном элек-тропоезде. Проведено технико – экономическое обоснование внедрения результатов работы. EN: ABSTRACT The dissertation paper is devoted to improving the reliability of electromotor compressors of rolling stock by providing normative values of heat insulation under real operating conditions and improve protection anchor range from excessive elec-tric currents that can cause heat insulation more acceptable values. Proposed, in contrast to previous studies, the process of starting to consider as being composed of two stages. In this paper a study to determine the values of currents at each of these phases and the influence of the duration of the stages of heat insulation. For theoretical investigations of the author to proposed mathematical model, whose adequacy is confirmed that the difference between the parameters ob-tained using this model and experimentally (by oscillography) is within 5%. Dependences of the duration of the first and second stages of start-up and current values of anchor on these stages under different conditions: different values of voltage in the contact system, ambient temperature, air pressure in the pneumatic system and the value of the moment on the shaft of the electric motor after starting. Experimentally and theoretically shown that in some cases protection of the electric motor with thermal relay ТРВ-8, 5 is not provided. With the thermal model the processes of heat insulation of armature winding during start-up and subsequent operation of the electric motor of compressor for various possible modes and conditions are investigated. The research results, obtained by using mathematical and thermal models, used for programming a new protection device of electric motor compressor from overload. The proposed protection device flawlessly for several years working on real electric rolling stock.
Hansen, Alan Christopher. "A diagnostic quasi-dimensional model of heat transfer and combustion in compression-ignition engines." Thesis, 1989. http://hdl.handle.net/10413/9595.
Full textThesis (Ph.D.)-University of Natal, Pietermaritzburg, 1989.
Rawlins, Mark Steve. "Diesel engine performance modelling using neural networks." Thesis, 2005. http://hdl.handle.net/10321/317.
Full textThe aim of this study is to develop, using neural networks, a model to aid the performance monitoring of operational diesel engines in industrial settings. Feed-forward and modular neural network-based models are created for the prediction of the specific fuel consumption on any normally aspirated direct injection four-stroke diesel engine. The predictive capability of each model is compared to that of a published quadratic method. Since engine performance maps are difficult and time consuming to develop, there is a general scarcity of these maps, thereby limiting the effectiveness of any engine monitoring program that aims to manage the fuel consumption of an operational engine. Current methods applied for engine consumption prediction are either too complex or fail to account for specific engine characteristics that could make engine fuel consumption monitoring simple and general in application. This study addresses these issues by providing a neural network-based predictive model that requires two measured operational parameters: the engine speed and torque, and five known engine parameters. The five parameters are: rated power, rated and minimum specific fuel consumption bore and stroke. The neural networks are trained using the performance maps of eight commercially available diesel engines, with one entire map being held out of sample for assessment of model generalisation performance and application validation. The model inputs are defined using the domain expertise approach to neural network input specification. This approach requires a thorough review of the operational and design parameters affecting engine fuel consumption performance and the development of specific parameters that both scale and normalize engine performance for comparative purposes. Network architecture and learning rate parameters are optimized using a genetic algorithm-based global search method together with a locally adaptive learning algorithm for weight optimization. Network training errors are statistically verified and the neural network test responses are validation tested using both white and black box validation principles. The validation tests are constructed to enable assessment of the confidence that can be associated with the model for its intended purpose. Comparison of the modular network with the feed-forward network indicates that they learn the underlying function differently, with the modular network displaying improved generalisation on the test data set. Both networks demonstrate improved predictive performance over the published quadratic method. The modular network is the only model accepted as verified and validated for application implementation. The significance of this work is that fuel consumption monitoring can be effectively applied to operational diesel engines using a neural network-based model, the consequence of which is improved long term energy efficiency. Further, a methodology is demonstrated for the development and validation testing of modular neural networks for diesel engine performance prediction.
Nagornyy, Aleksandr S. "Evaluation of the stray load losses for a three-phase induction motor." Thesis, 2003. http://hdl.handle.net/1957/32058.
Full textGraduation date: 2004
Sanyangare, (Chawira) Faith. "Simulation of the adsorptive desulphurisation of diesel fuel." Thesis, 2016. http://hdl.handle.net/10539/22331.
Full textThe global focus on cleaner air has seen sulphur removal processes’ gaining popularity and adsorptive desulphurisation has been identified as an effective alternative. Adsorptive desulphurisation was used to simulate and evaluate the performance of the polymer supported imidation agent (Sodium N-chloro-polystyrene sulphonamide) as an adsorbent in the desulphurisation of diesel fuel. This study involved the development of a mathematical model for the adsorption process of sulphur on the polymer supported imidation agent, based on the mass balance on a continuous fixed bed column and pseudo second order kinetics. The developed model was solved using numerical methods, and the simulation of the process carried out varying different parameters; the inlet sulphur concentration, the adsorption column bed height and the particle size (radius) of the adsorbent. The simulation showed that the adsorption capacity of the studied adsorbent increased with increase in the inlet sulphur concentration; an increase in the adsorption bed height and a decrease in the adsorbent particle size. Validation of the simulation done was carried out by comparing the simulation data with experimental data. The proposed model fit experimental data and can be used to predict the inlet concentration conditions, bed height and particle size of the adsorbent. The overall research enhances the understanding of the adsorptive desulphurisation of diesel fuel using the polymer supported imidation agent and the mathematical modelling of the process.
MT2017
Patton, Chris. "Development of vehicle dynamics tools for motorsports." Thesis, 2013. http://hdl.handle.net/1957/37361.
Full textGraduation date: 2013
Matsho, Stephens Kgalushi. "The dynamics of the compression of a motor vehicle tyre constrained by the road." Thesis, 2012. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000620.
Full textAttempts will be made to extend the elementary quarter-mass models (for instance Gillepse, 1992, [5]; Kiecke & Nielsen, 2000, [6] and Singiresu, 2004, [7]) of a motor vehicle suspension system to include the radial vibrations of a rubber tyre in the model. Tangential vibrations of the tyre surface were investigated by Bekker (2009, [8]) and the possible incorporation of such vibrations into a suspension model invites the possibility of future study.
"An intelligent vehicle security system based on human behaviors modeling." 2006. http://library.cuhk.edu.hk/record=b5892893.
Full textThesis (M.Phil.)--Chinese University of Hong Kong, 2006.
Includes bibliographical references (leaves 99-106).
Abstracts in English and Chinese.
Chapter 1 --- Introduction --- p.1
Chapter 1.1 --- Motivation --- p.1
Chapter 1.2 --- Overview --- p.2
Chapter 1.3 --- Organization of the Thesis --- p.3
Chapter 2 --- Related Research --- p.6
Chapter 2.1 --- Information Technology in Cars --- p.6
Chapter 2.2 --- Anti-theft Protection --- p.8
Chapter 2.3 --- Learning Human Behaviors --- p.10
Chapter 2.4 --- Neural Network Learning --- p.11
Chapter 3 --- Experimental Design --- p.14
Chapter 3.1 --- Overview --- p.14
Chapter 3.2 --- Driving Simulation Subsystem --- p.14
Chapter 3.3 --- Data Sensing and Capturing Subsystem --- p.15
Chapter 3.4 --- Data Analysis Subsystem --- p.17
Chapter 4 --- Data Preprocessing for Feature Selection --- p.23
Chapter 4.1 --- Introduction --- p.23
Chapter 4.2 --- Fast Fourier Transform --- p.23
Chapter 4.3 --- Principal Component Analysis --- p.24
Chapter 4.4 --- Independent Component Analysis --- p.26
Chapter 5 --- Classification via Support Vector Machine --- p.28
Chapter 5.1 --- Introduction --- p.28
Chapter 5.1.1 --- Why Using Support Vector Machine --- p.28
Chapter 5.1.2 --- Mathematic Description --- p.29
Chapter 5.2 --- Problem Formulation --- p.31
Chapter 5.3 --- Approach --- p.31
Chapter 5.4 --- Experimental Results --- p.34
Chapter 5.4.1 --- Preprocess Data Analysis --- p.34
Chapter 5.4.2 --- Models Design --- p.37
Chapter 5.5 --- Discussion --- p.44
Chapter 6 --- Evaluation via Hidden Markov Model --- p.47
Chapter 6.1 --- Introduction --- p.47
Chapter 6.1.1 --- Why Using Hidden Markov Model --- p.48
Chapter 6.1.2 --- Mathematic Description --- p.50
Chapter 6.2 --- Problem Formulation --- p.51
Chapter 6.3 --- Approach --- p.53
Chapter 6.4 --- Experimental Results --- p.56
Chapter 6.4.1 --- Model-to-model Measure --- p.56
Chapter 6.4.2 --- Human-to-model Measure --- p.63
Chapter 6.4.3 --- Parameters Optimization --- p.66
Chapter 6.5 --- Discussion --- p.69
Chapter 7 --- System Design and Implementation --- p.71
Chapter 7.1 --- Introduction --- p.71
Chapter 7.2 --- Hardware --- p.72
Chapter 7.3 --- Software --- p.78
Chapter 7.4 --- System Demonstration --- p.80
Chapter 8 --- Conclusion and Future Work --- p.82
Chapter 8.1 --- Contributions --- p.82
Chapter 8.2 --- Future Work --- p.84
Chapter A --- Hidden Markov Model Training --- p.87
Chapter A.1 --- Forward-backward Algorithm --- p.87
Chapter A.2 --- Baum-Welch Algorithm --- p.87
Chapter B --- Human Driving Behavior Data --- p.90
Chapter C --- Publications Resulted from the Study --- p.98
Bittner, Sean Robert. "Building theories of neural circuits with machine learning." Thesis, 2021. https://doi.org/10.7916/d8-qkrz-sv89.
Full textLai, Kwok Leung. "A numerical study of bluff body flow / submitted by Kwok Leung Lai." 2000. http://hdl.handle.net/2440/19895.
Full textIncludes bibliographical references (leaves 459-472).
System requirements for accompanying CD-ROM: Macintosh or IBM compatible computer. Other requirements: Adobe Acrobat Reader.
xxxvi, 473 leaves ; ill. ; 30 cm. + 1 computer optical disk (4 3/4 in.)
Title page, contents and abstract only. The complete thesis in print form is available from the University Library.
A numerical scheme, based on discrete-vortex and surface-vorticity boundary-integral methods, has been developed for stimulating time dependent, two-dimensional, viscous flow over arbitary arrays of solid bodies of arbitary cross-section
Thesis (Ph.D.)--Adelaide University, Dept. of Mechanical Engineering, 2001
Lai, Kwok Leung. "A numerical study of bluff body flow / submitted by Kwok Leung Lai." Thesis, 2000. http://hdl.handle.net/2440/19895.
Full textIncludes bibliographical references (leaves 459-472).
System requirements for accompanying CD-ROM: Macintosh or IBM compatible computer. Other requirements: Adobe Acrobat Reader.
xxxvi, 473 leaves ; ill. ; 30 cm. + 1 computer optical disk (4 3/4 in.)
A numerical scheme, based on discrete-vortex and surface-vorticity boundary-integral methods, has been developed for stimulating time dependent, two-dimensional, viscous flow over arbitary arrays of solid bodies of arbitary cross-section
Thesis (Ph.D.) -- University of Adelaide, Dept. of Mechanical Engineering, 2001
Quigley, Christopher John 1962. "Refueling and evaporative emissions of volatile organic compounds from gasoline powered motor vehicles." Thesis, 2007. http://hdl.handle.net/2152/3642.
Full textWu, Meng. "Fuzzy-Rule-Based Failure Detection and Early Warning System for Lithium-ion Battery." 2013. http://hdl.handle.net/1805/3522.
Full textLithium-ion battery is one kind of rechargeable battery, and also renewable, sustainable and portable. With the merits of high density, slow loss of charge when spare and no memory effect, lithium-ion battery is widely used in portable electronics and hybrid vehicles. Apart from its advantages, safety is a major concern for Lithium-ion batteries due to devastating incidents with laptop and cell phone batteries. Overcharge and over-discharge are two of the most common electrical abuses a lithium-ion battery suffers. In this thesis, a fuzzy-rule-based system is proposed to detect the over-charge and over-discharge failure in early time. The preliminary results for the failure signatures of overcharged and over-discharged lithium-ion are listed based on the experimental results under both room temperature and high temperature. A fuzzy-rule-based model utilizing these failure signatures is developed and validated. For over-charge case, the abnormal increase of the surface temperature and decrease of the voltage are captured. While for over discharge case, unusual temperature increase during overcharge phases and abnormal current decrease during overcharge phases are obtained. The inference engine for fuzzy-rule-based system is designed based on these failure signatures. An early warning signal will be given by this algorithm before the failure occurs. This failure detection and early warning system is verified to be effective through experimental validation. In the validation test, the proposed methods are successfully implemented in a real-time system for failure detection and early warning. The result of validation is compatible with the design expectation. Finally an accurate failure detection and early warning system is built and tested successfully.
Mukherjee, Prateep. "Active geometric model : multi-compartment model-based segmentation & registration." Thesis, 2014. http://hdl.handle.net/1805/4908.
Full textWe present a novel, variational and statistical approach for model-based segmentation. Our model generalizes the Chan-Vese model, proposed for concurrent segmentation of multiple objects embedded in the same image domain. We also propose a novel shape descriptor, namely the Multi-Compartment Distance Functions or mcdf. Our proposed framework for segmentation is two-fold: first, several training samples distributed across various classes are registered onto a common frame of reference; then, we use a variational method similar to Active Shape Models (or ASMs) to generate an average shape model and hence use the latter to partition new images. The key advantages of such a framework is: (i) landmark-free automated shape training; (ii) strict shape constrained model to fit test data. Our model can naturally deal with shapes of arbitrary dimension and topology(closed/open curves). We term our model Active Geometric Model, since it focuses on segmentation of geometric shapes. We demonstrate the power of the proposed framework in two important medical applications: one for morphology estimation of 3D Motor Neuron compartments, another for thickness estimation of Henle's Fiber Layer in the retina. We also compare the qualitative and quantitative performance of our method with that of several other state-of-the-art segmentation methods.