Дисертації з теми "Wheel dynamics"
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Müller, Steffen. "Linearized wheel-rail dynamics : stability and corrugation /." Düsseldorf : VDI-Verl, 1998. http://www.gbv.de/dms/bs/toc/265578795.pdf.
Повний текст джерелаSilva, Seth F. "Applied System Identification for a Four Wheel Reaction Wheel Platform." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/328.
Повний текст джерелаShahzamanian, Sichani Matin. "Wheel-rail contact modelling in vehicle dynamics simulation." Licentiate thesis, KTH, Spårfordon, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-127949.
Повний текст джерелаQC 20130911
Logan, Jeffery Jay. "Control and Sensor Development on a Four-Wheel Pyramidal Reaction Wheel Platform." DigitalCommons@CalPoly, 2008. https://digitalcommons.calpoly.edu/theses/27.
Повний текст джерелаHossein, Nia Saeed. "On Heavy-Haul Wheel Damages using Vehicle Dynamics Simulation." Doctoral thesis, KTH, Spårfordon, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-220344.
Повний текст джерелаQC 20171219
Varnhagen, Scott Julian. "Development of Vehicle Dynamics Control for Wheel-Motored Vehicles." Thesis, University of California, Davis, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3685305.
Повний текст джерелаThis dissertation describes a methodology for the vehicle dynamics control of a wheel motored vehicle. All theory is developed assuming that the driver has control of the front wheel steering angle, and that wheel torque is solely generated by independent wheel motors at each corner of the vehicle. Theoretical work is presented for the general case with four independent wheel motors, but can be easily reduced to a situation with only two wheel motors. Indeed, all theory developed in this work is evaluated experimentally on a production automobile converted to be driven by two independent rear wheel motors.
As opposed to directly allocating wheel torques, the proposed philosophy operates in the slip-ratio domain. Doing so helps to prevent excessive tire saturation and allows the system to adapt to changing road surfaces. To that end, this dissertation first proposes a method of estimating slip-ratio utilizing only sensors currently available on modern automobiles. A slip-ratio controller is then developed approximating the disturbance observer structure. This allows the controller to be robust to changing road surface and as a byproduct provide an accurate estimate of longitudinal tire force. Combining the estimated longitudinal tire force with the estimated slip-ratio it is then possible to ascertain some degree of tire saturation. With this in mind, an optimal control allocation problem is proposed which attempts to achieve the desired vehicle dynamics while at the same time minimizing tire saturation.
It is shown experimentally that the proposed control methodology effectively achieves desired vehicle dynamics. In addition, the system adapts its behavior to changing road surfaces resulting in optimal performance regardless of operating conditions.
Hosseini, SayedMohammad. "A Statistical Approach to Modeling Wheel-Rail Contact Dynamics." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/101864.
Повний текст джерелаMaster of Science
The interaction between the wheel and rail plays an important role in the dynamic behavior of railway vehicles. The wheel-rail contact has been extensively studied through analytical models, and measuring the contact forces is among the most important outcomes of such models. However, these models typically fall short when it comes to addressing the practical problems at hand. With the development of a high-precision test rig—called the VT-FRA Roller Rig, at the Center for Vehicle Systems and Safety (CVeSS)—there is an increased opportunity to tackle the same problems from an entirely different perspective, i.e. through statistical modeling of experimental data. Various experiments are conducted in different settings that represent railroad operating conditions on the VT-FRA Roller Rig, in order to study the relationship between wheel-rail traction and the variables affecting such forces. The experimental data is used to develop parametric and non-parametric statistical models that efficiently capture this relationship. The study starts with single regression models and investigates the main effects of wheel load, creepage, and the angle of attack on the longitudinal and lateral traction forces. The analysis is then extended to multiple models, and the existence of interactions among the explanatory variables is examined using model selection approaches. The developed models are then compared with their non-parametric counterparts, such as support vector regression, in terms of "goodness of fit," out-of-sample performance, and the distribution of the predictions. The study develops regression models that are able to accurately explain the relationship between traction forces, wheel load, creepage, and the angle of attack.
Villella, Matthew G. "Nonlinear Modeling and Control of Automobiles with Dynamic Wheel-Road Friction and Wheel Torque Inputs." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5198.
Повний текст джерелаShakleton, Philip Andrew. "An optimised wheel-rail contact model for vehicle dynamics simulation." Thesis, Manchester Metropolitan University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515184.
Повний текст джерелаZHU, JING. "Host-rotaxanes as binding agents: the effects of wheel dynamics." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1214400642.
Повний текст джерелаZhu, Jing. "Host-rotaxanes as binding agents the effects of wheel dynamics/." Cincinnati, Ohio : University of Cincinnati, 2008. http://rave.ohiolink.edu/etdc/view.cgi?acc_num=ucin1214400642.
Повний текст джерелаAdvisors: David B. Smithrud PhD (Committee Chair), Allan R. Pinhas PhD (Committee Member), Apryll Stalcup PhD (Committee Member) Title from electronic thesis title page (viewed Oct. 4, 2008). Includes abstract. Keywords: rotaxane Includes bibliographical references.
Zhan, Yun, and 詹云. "Finite element analysis of vibration excited by rail-wheel interaction." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/208053.
Повний текст джерелаShahzamanian, Sichani Matin. "On Efficient Modelling of Wheel-Rail Contact in Vehicle Dynamics Simulation." Doctoral thesis, KTH, Spårfordon, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-181691.
Повний текст джерелаQC 20160202
Abbott, Michael Shawn. "Kinematics, Dynamics and Control of Single-Axle, Two-Wheel Vehicles (Biplanar Bicycles)." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/31702.
Повний текст джерелаMaster of Science
Hossein, Nia Saeed. "An Investigation of the Iron-Ore Wheel Damages using Vehicle Dynamics Simulation." Licentiate thesis, KTH, Spårfordon, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-159733.
Повний текст джерелаQC 20150210
Jonasson, Mats. "Exploiting individual wheel actuators to enhance vehicle dynamics and safety in electric vehicles." Doctoral thesis, KTH, Fordonsdynamik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11005.
Повний текст джерелаQC 20100722
Chu, Tzyy-Wen. "Eigenstructure analysis of automobile steering dynamics with application to robust four wheel steering control." Thesis, University of Warwick, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246817.
Повний текст джерелаSharaf, Al-Hossein Mostafa. "Investigation of all-wheel-drive off-road vehicle dynamics augmented by visco-lock devices." Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/34904.
Повний текст джерелаGRAU, CESAR A. "A PARAMETRIC STUDY OF THE LATERAL DYNAMICS OF A NONLINEAR FOUR-WHEEL ROAD-VEHICLE MODEL." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054134618.
Повний текст джерелаLee, Hyunwook. "A Polynomial Chaos Approach for Stochastic Modeling of Dynamic Wheel-Rail Friction." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77195.
Повний текст джерелаPh. D.
Brooks, Douglas Antwonne. "Control of reconfigurability and navigation of a wheel-legged robot based on active vision." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26545.
Повний текст джерелаCommittee Chair: Howard, Ayanna; Committee Member: Egerstedt, Magnus; Committee Member: Vela, Patricio. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Refvem, Charles T. "Design, Modeling and Control of a Two-wheel Balancing Robot Driven by BLDC Motors." DigitalCommons@CalPoly, 2019. https://digitalcommons.calpoly.edu/theses/2110.
Повний текст джерелаMeymand, Sajjad Zeinoddini. "State of the Art Roller Rig for Precise Evaluation of Wheel-Rail Contact Mechanics and Dynamics." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/64920.
Повний текст джерелаPh. D.
Knobel, Christian. "Optimal control allocation for road vehicle dynamics using wheel steer angles, brake, drive torques camber angles." Düsseldorf VDI-Verl, 2009. http://d-nb.info/992593425/04.
Повний текст джерелаSeegmiller, Neal A. "Dynamic Model Formulation and Calibration for Wheeled Mobile Robots." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/460.
Повний текст джерелаAndersson, Emil. "Optimization and re-design of a wheel hub to reduce unsprung mass of a rallycross car." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-15721.
Повний текст джерелаJayakumar, Gautham. "Modeling And Analysis Of Fault Conditions In Avehicle With Four In-Wheel Motors." Thesis, KTH, Fordonsdynamik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-121475.
Повний текст джерелаMoas, Eduardo. "Investigation of the finite element method for computing wheel/rail contact forces in steady curving." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/50064.
Повний текст джерелаMaster of Science
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Hosseinipour, Milad. "Electromechanical Design and Development of the Virginia Tech Roller Rig Testing Facility for Wheel-rail Contact Mechanics and Dynamics." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/82542.
Повний текст джерелаPh. D.
Duan, FangFang. "Numerical tribology of the wheel-rail contact : Application to corrugation defect." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0019/document.
Повний текст джерелаFor more than a century, rail corrugation has been exposed as one of the most serious problems experienced in railway networks. It also comes with a series of problems for maintenance, such as rolling noises and structural vibrations that can reduce lifetime of both train and track. This periodical phenomenon on rail surface is closely linked to wheel-rail contact dynamic, which depends on friction, train dynamics… To better understand corrugation birth conditions, a numerical model is suggested to complement the experimental limitations and to instrument a wheel-rail contact both locally and dynamically. At first, an appropriate tool was chosen to create the dynamic wheel-rail contact model to reproduce straight-track corrugation, also called “short-pitch” corrugation. The implicit dynamic finite element code Abaqus was chosen to investigate the dynamic local contact conditions. Both the origin and the evolution of straight-track corrugation under transient conditions (acceleration / deceleration) are studied. The parametrical sensibility of corrugation is thus investigated both with single/multiple wheel passing(s) and with geometric defect. A stick-slip phenomenon, linked to both wheel and rail dynamics coupled through the contact, is identified as the root of straight-track corrugation under transient conditions. Secondly, results obtained with the previous model have highlighted a quick decrease of corrugation amplitude with the increase of wheel passings over the rail. This last result seems to be in contradiction with reality. This problem comes from the difficulty to reliably manage contact dynamics, and particularly with local impacts, with the use of classical finite element models such as the one implemented in Abaqus. To compensate for this lack, a mass redistribution method is implemented in Abaqus and used with the previous case. The results show a more realistic corrugation growth according to the number of wheel passings
Elias, Laila Mireille 1977. "Dynamics of multi-body space interferometers including reaction wheel gyroscopic stiffening effects : structurally connected and electromagnetic formation of flying architectures." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/17795.
Повний текст джерелаIncludes bibliographical references (p. 181-184).
Space telescopes have the potential to revolutionize astronomy and our search for life-supporting planets beyond our Solar System. Free of atmospheric distortions, they are able to provide a much "clearer" view of the universe than ground-based telescopes. A developing technology that appears promising is space-based interferometry, which uses multiple apertures separated at great distances to act as a large virtual aperture. In this way, interferometers will achieve angular resolutions far greater than those achievable by monolithic telescopes. In this thesis, we investigate the dynamics and control of two proposed architectures for spaceborne interferometers: structurally connected interferometers and electromagnetic formation flying interferometers. For structurally connected interferometers, we develop a coupled disturbance analysis method that accurately predicts a space telescope's optical performance in the presence of reaction wheel vibrational disturbances. This method "couples" a reaction wheel to a structure using estimates of the accelerances (or mobilities) of both bodies. This coupled analysis method is validated on the Micro-Precision Interferometer testbed at NASA's Jet Propulsion Laboratory. The predictions show great improvement over a simplified "decoupled" analysis method when compared to experimental data. For formation flying interferometers, we consider the use of electromagnets as relative position actuators. A high fidelity, nonlinear dynamic model of a deep-space electromagnetic formation flight (EMFF) array is derived from first principles. The nonlinear dynamics are linearized for a two-vehicle array about a nominal trajectory, and the linearzed model is shown to be unstable,
(cont.) but controllable, and therefore stabilizable. A linear optimal controller is designed for the system and implemented to form the closed-loop dynamics. Time simulations of the closed-loop nonlinear dynamics demonstrate that EMFF using linear control proves very effective, despite the nonlinearities of the system's dynamics and the electromagnetic actuators.
by Laila Mireille Elias.
Ph.D.
Currie, Blake J. "Control of a Spacecraft Using Mixed Momentum Exchange Devices." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1313.
Повний текст джерелаPapp, Tomáš. "Konstrukční návrh měřicího volantu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231766.
Повний текст джерелаAhmad, Husain Abdulrahman. "Dynamic Braking Control for Accurate Train Braking Distance Estimation under Different Operating Conditions." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/19322.
Повний текст джерелаAn MRAC system is developed to control the amount of current through traction motors under various wheel/rail adhesion conditions while braking. Minimizing the braking distance of a train requires the dynamic braking forces to be maximized within the available wheel/rail adhesion. Excessively large dynamic braking can cause wheel lockup that can damage the wheels and rail. Excessive braking forces can also cause large buff loads at the couplers. For DC traction motors, an MRAC system is used to control the current supplied to the traction motors. This motor current is directly proportional to the dynamic braking force. In addition, the MRAC system is also used to control the train speed by controlling the synchronous speed of the AC traction motors. The goal of both control systems for DC and AC traction motors is to apply maximum available dynamic braking while avoiding wheel lockup and high coupler forces. The results of the study indicate that the MRAC system significantly improves braking distance while maintaining better wheel/rail adhesion and coupler dynamics during braking. Furthermore, according to this study, the braking distance can be accurately estimated when MRAC is used. The robustness of the MRAC system with respect to different parameters is investigated, and the results show an acceptable robust response behavior.
Ph. D.
Downs, Matthew C. "Adaptive Control Applied to the Cal Poly Spacecraft Attitude Dynamics Simulator." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/231.
Повний текст джерелаNelkov, Nyagolov Dimitar, Bashir Abbas, and Genovski Filip Valentinov. "Simulation of the Geometry Influence on Curvic Coupled Engagement." Thesis, Linnéuniversitetet, Institutionen för teknik, TEK, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-27291.
Повний текст джерелаde, Leeuw Bente. "Improving the validation of a railway vehicle model in the virtual certification process." Thesis, KTH, Spårfordon, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302262.
Повний текст джерелаInnan ett fordon kan tas i bruk måste det genomgå en tillståndsprocess. För närvarande är denna process till stor del beroende av provningar. Detta är dock en dyr och lång process. Med hjälp av ny teknik och förbättrade simuleringar kan denna process förkortas och kostnaderna sänkas. Valideringen av en fordonsmodell begränsas dock ofta av de tillgängliga uppgifterna. Ofta finns inte de uppmätta rälsprofilerna tillgängliga och därför används en ny UIC60-profil för simuleringarna. Järnvägsspåret har ofta använts och visarDärför har forskning gjorts för att undersöka hur rälsprofilerna påverkar valideringen av en modell av ett järnvägsfordon. De nuvarande valideringsmetoderna i den europeiska normen används för att jämföra simulerade värden med de krafter och accelerationer som finns tillgängliga från fordonsmätningar. I det första steget har 25 spårsektioner med olika kurvradier använts.simulerats med en uppmätt rälsprofil var 100:e meter. I nästa steg har samma sektioner simulerats med hjälp av standardprofilen UIC60. Resultaten visar att användningen av uppmätta rälsprofiler har en positiv inverkan på simuleringsresultatet. I det sista steget har en enda smal kurva simulerats för att visa effekten av standard- och slitna rälsprofiler. Fyra olika slitningsstadier av rälsprofilen simuleras och jämförs med tillgängliga fordonsmätningar. Simuleringarna visar att användningen av en mediumsliten rälsprofil ger det mest exakta värdet.
Jandora, Radek. "Výpočtové modelování dynamických projevů v kontaktu kola a kolejnice s obecnou geometrií kontaktních povrchů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-234020.
Повний текст джерелаEriksson, Fredrik, Joseph Linu Kuttikkal, and Amanuel Mehari. "Parametric study of a dog clutch used in a transfer case for trucks." Thesis, Linnéuniversitetet, Institutionen för maskinteknik (MT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-27107.
Повний текст джерелаSilva, Ludmila Corrêa Alkmin e. "Principios basicos de um laboratorio virtual para veiculos : aplicação em acessibilidade." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264385.
Повний текст джерелаDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
Made available in DSpace on 2018-08-09T20:19:37Z (GMT). No. of bitstreams: 1 Silva_LudmilaCorreaAlkmine_M.pdf: 11763178 bytes, checksum: 949344e47dc2505f86cd5805376922d8 (MD5) Previous issue date: 2007
Resumo: Neste trabalho foi desenvolvido um laboratório virtual para dinâmica veicular e modelagem do contato roda-piso que foi usado para a visualização do comportamento dinâmico de uma cadeira de rodas em diversas situações. Utilizando o ambiente Working Model 2Dâ para a integração das equações de movimento e visualização dos deslocamentos e movimentos associados, implementou-se modelos do contato roda-piso a partir da literatura de referência. Foram propostos sucessivamente quatro diferentes modelos do contato roda-piso, um modelo próprio para o controle da velocidade e aceleração, o modelo de Huston, a fórmula mágica e por último o modelo de Raheman. Todos esses modelos foram implementados, simulados e comparados entre si, por meio de imagens e gráficos obtidos. Todos os modelos se mostraram bastante confiáveis e suficientemente simples. No entanto, não existem dados confiáveis para os coeficientes destes modelos quando usados para a modelagem de rodas e ambientes inteiros como acontece em uma cadeira de rodas. Assim levou-se ao desenvolvimento de uma bancada experimental para a obtenção desses parâmetros
Abstract: In this work it was developed a virtual laboratory to vehicular dynamics and the modeling of the contact between ground and wheel that was used to visualize the dynamic behavior of the wheelchair in diverse situations. Using the Working Model 2D for the integration of the equations of motion and visualization of the displacements, the model of the contact between the ground and wheel had been implemented from the reference literature. Four different models of the contact between ground and wheel had been considered successively, a proper model for control of the speed and acceleration, the Huston model, the Magic Formula and then the Raheman model. All these models had been implemented simulated and compared each other by figures and graphs. All the models developed was sufficiently trustworthy and enough simple. However, trustworthy parameters do not exist for the coefficient of these models when used for the modeling of the wheelchair. So was developed an experiment to raise these parameters
Mestrado
Mecanica dos Sólidos e Projeto Mecanico
Mestre em Engenharia Mecânica
Luu, Quang Khanh [Verfasser], Dirk [Akademischer Betreuer] Söffker, and Tamara [Akademischer Betreuer] Nestorovic. "Stability-Oriented Dynamics and Control of Complex Rigid-Flexible Mechanical Systems Using the Example of a Bucket-Wheel Excavator / Quang Khanh Luu. Gutachter: Tamara Nestorovic. Betreuer: Dirk Söffker." Duisburg, 2015. http://d-nb.info/1066206376/34.
Повний текст джерелаLuu, Quang Khanh Verfasser], Dirk [Akademischer Betreuer] [Söffker, and Tamara [Akademischer Betreuer] Nestorovic. "Stability-Oriented Dynamics and Control of Complex Rigid-Flexible Mechanical Systems Using the Example of a Bucket-Wheel Excavator / Quang Khanh Luu. Gutachter: Tamara Nestorovic. Betreuer: Dirk Söffker." Duisburg, 2015. http://d-nb.info/1066206376/34.
Повний текст джерелаHuttenlocher, Luciana de Moraes Gamba. "Estudo do esterçamento nas quatro rodas de um veículo automotivo baseado em duas estratégias de controle da literatura." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-11072018-103217/.
Повний текст джерелаThe lateral dynamic behavior of the automotive vehicles is studied with the aid of a computational tool for multibody systems modeling and simulation. Two rear wheel steering control strategies are used for evaluation of the main four wheel steering characteristics. One strategy steer the rear wheels as a function of the steering wheel angle, and the other one, steer the rear wheels as a function of the steering wheel angle and the speed. The steer step input is the test used, where the lateral acceleration, the yaw rate and the roll angle transient and stead state response are evaluated. The simulation results show that the four wheel steering vehicles have a slower yaw rate time response, and a fast lateral acceleration and roll angle time response than the conventional vehicle. Also four wheel vehicles show a reduction in lateral acceleration, yaw rate a.nd roll angle gain. Moreover they are more understeer than the conventional vehicle. These characteristics are particularly more evident on the vehicle with steer dependent system. The obtained results correspond with four wheel steering vehicles behavior founded in literature.
Wanner, Daniel. "Controlling over-actuated road vehicles during failure conditions." Doctoral thesis, KTH, Fordonsdynamik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166819.
Повний текст джерелаQC 20150520
Sureka, Arihant. "Improvement of an existing Integrated Vehicle Dynamics Control System influencing an urban electric car." Thesis, KTH, Flygdynamik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-284446.
Повний текст джерелаKonceptet Integrated Vehicle Dynamics Control (IVDC) kan påverka fordonets beteende både longitudinellt och lateralt med bara ett regler koncept iett övre lager och ytterligare regulatorer på lägre nivåer. Detta kräver tillståndsuppskattning av fordonet som också inkluderar uppskattning av parametrar av intresse för en fordonsdynamiker. Tillvägagångssättet för denna studie är för det första att utveckla en robust tillståndsestimering med hjälp av ett Unscented Kalman Filter (UKF) för att uppskatta ett fordons avdriftsvinkel och även för uppskattning av ett däcks sidkraftskoefficient, vilket sedan används i den befintliga modell-prediktiva regleralgoritmen (MPCA) för att förbättra lateralstabiliteten hos fordonet för de olika studerade manövrarna. Baserat på denna utveckling skapades två typer av filter, ett med anpassning av avståndet mellan tyngdpunkten (COG) och krängcentrumhöjden och ett annat utan anpassning. Nyckelfaktorn i estimeringsutvecklingen är den tidsberoende adaptiva inställningenav processkovariansmatrisen för sidkraftskoefficienterna, med vilken endast de initiala värdena behöver parametriseras. Efter filterutvecklingen identifieras parametrar baserade på en förväntad kundanvändning och en statistisk variansanalys (ANOVA) utförs för att bestämma de mest inflytelserika faktorerna i gruppen. En parameteroptimering utförs för att förbättra uppskattningskvaliteten. Kombinationen av detta arbete omfattar en effektiv och anpassningsbar metod för en bättre uppskattningskvalitet med en kinematisk fordonsmodell som har en fordonsrespons som ett verkligt fordon, åtminstone praktiskt taget. Denna studie har genomförts med förståelse för olika optimala estimatorer, parametrisk känslighetsanalys och statistiska slutsatser, vilket underlättaren bas för robust uppskattning. Nyckelord: kalametric, tillståndsestimering, designmatris, vikningsdistorsion, kalmanfilter,projection algorithm, upplösning
Elsayed, Abdel Hameed Amer Shaltout Ramy. "MULTIBODY APPROACH FOR RAILWAY DYNAMIC ANALYSIS." Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/27622.
Повний текст джерелаElsayed Abdel Hameed Amer Shaltout, R. (2013). MULTIBODY APPROACH FOR RAILWAY DYNAMIC ANALYSIS [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/27622
TESIS
Štěnička, Petr. "Stend pro analýzu přístroje k mazání okolků kolejových vozidel." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229383.
Повний текст джерелаGunduz, Aydin. "Multi-Dimensional Stiffness Characteristics of Double Row Angular Contact Ball Bearings and Their Role in Influencing Vibration Modes." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1326397623.
Повний текст джерелаGérardin, Fabien. "Étude expérimentale et numérique de la dispersion d'aérosols dans le sillage d'une roue de véhicule." Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL015N/document.
Повний текст джерелаWhilst it is common knowledge that fuel combustion in a motorised vehicle generates gaseous and particulate pollution, particles emission caused by a travelling vehicle is accounted for to a much lesser extent. Whether a vehicle is moving on motorways, roads, unpaved roads or industrial soils, it projects particles that are naturally present on the ground. This case represents a significant diffuse emission source, depending principally on the speed of the vehicle, on the load and on the humidity of the road surface material. Studying the aerodynamic behaviour of air in the vicinity of wheels under real conditions is not easy from an experimental point of view and numerical models are difficult to validate. Insufficient knowledge of this issue and the complexity of this type of aerodynamic behaviour support the preferred option of studying a simple case, such as an isolated wheel The goal of this work is to provide background information on the aerosol spreading in the field close to a vehicle rotating wheel. From a state of the art on this issue, this study was to assess the airflow and particles experimental behaviour around a wheel integrating the presence of patterns on the surface of the tire. While not claim a comparative study between different pattern geometries, this work is to highlight the differences between flow around a smooth wheel and patterned wheel. This research is based on the experimentation extended to the simulation. It will be the bases for a reflection on the possibilities of devices development to reduce dust emissions caused by the movement of industrial vehicles
Velasquez, Andres Eduardo Baquero. "helvis III - Desenvolvimento e caracterização da plataforma robótica." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18149/tde-05052015-101452/.
Повний текст джерелаThe main objective of this work is the development and characterization of a robotic vehicle ℏelvis III in order to use it in the development of researches focused on the fields of mobile robotics control and navigation. Initially the propulsion system was characterized in order to determine the real velocity of vehicle in real conditions (four different kinds of grounds were used). In addition to this, the steering system was also characterized by applying the well-known bicycle kinematic model. During these experimental tests we could find the relation between the position of the servo-motor and the value of steering angle of the bicycle model. The real values of CEP (Circular Error Probability) and SEP (Spherical Error Probability) errors of the vehicle embedded GPS (Global Positioning System) were determined based on two experiments: the first one was carried out in São Carlos – SP (Brazil) and the second one in Villavicencio – Meta (Colombia). During the GPS experiments we could also characterize the vehicle embedded IMU (Inertial Measurement Unit). Then we could observe and measure the effect of solar light on the LIDAR sensor (Laser Imaging Detection and Ranging) performance. Finally, the forward vehicle dynamics is described, with the determination of the center of mass of the vehicle and the observation of the normal forces behavior in the vehicle wheels when it is stopped or moved on an inclined floor.