Дисертації з теми "Dynamic vehicle load"
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姜瑞娟 and Ruijuan Jiang. "Identification of dynamic load and vehicle parameters based on bridge dynamic responses." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31244270.
Повний текст джерелаKhavassefat, Parisa. "Vehicle-Pavement Interaction." Doctoral thesis, KTH, Väg- och banteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156045.
Повний текст джерелаQC 20141119
Smagina, Zana. "Dynamic amplification for moving vehicle loads on buried pipes : Evaluation of field-tests." Thesis, KTH, Bro- och stålbyggnad, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-36801.
Повний текст джерелаDavis, Lloyd Eric. "Heavy vehicle suspensions : testing and analysis." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/34499/1/Lloyd_Davis_Thesis.pdf.
Повний текст джерелаLeiviskä, Albin. "Load generation on a CV90 track system using multibody dynamics." Thesis, Umeå universitet, Institutionen för fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-187750.
Повний текст джерелаNaraghi, Mahyar. "Dynamics and control of fast automated guided vehicles for high load applications." Thesis, University of Ottawa (Canada), 1996. http://hdl.handle.net/10393/10268.
Повний текст джерелаGreen, Mark Finkle. "The dynamic response of short-span highway bridges to heavy vehicle loads." Thesis, University of Cambridge, 1991. https://www.repository.cam.ac.uk/handle/1810/251494.
Повний текст джерелаH, N. Akshay Jamadagni. "Simulations of complete vehicles in cold climate at partial and full load driving conditions." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-170181.
Повний текст джерелаVargas, Moreno Aldo Enrique. "Machine learning techniques to estimate the dynamics of a slung load multirotor UAV system." Thesis, University of Glasgow, 2017. http://theses.gla.ac.uk/8513/.
Повний текст джерелаBorg, Lane. "An Approach to Using Finite Element Models to Predict Suspension Member Loads in a Formula SAE Vehicle." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/34020.
Повний текст джерелаThe goal of this research is to determine the validity of each of the assumptions made in the method used for calculating the vehicle suspension loads by hand. These assumptions include modeling the suspension as pinned-pinned truss members to prevent bending, neglecting any steering angle input to the suspension, and neglecting vertical articulation of the system. This thesis presents an approach to modeling the suspension member loads by creating a finite element (FE) model of the entire suspension system. The first stage of this research covers the validation of the current calculation methods. The FE model will replicate the suspension with all of the current assumptions and the member loads will be compared to the hand calculations. This truss-element-based FE model resulted in member loads identical to the hand calculations.
The next stage of the FE model development converts the truss model to beam elements. This step is performed to determine if the assumption that bending loads are insignificant is a valid approach to calculating member loads. In addition to changing the elements used from truss to beam element, the suspension linkage was adapted to more accurately model the methods by which each member is attached to the others. This involves welding the members of each control arm together at the outboard point as well as creating a simplified version of the pull rod mounting bracket on the upper control arm. The pull rod is the member that connects the ride spring, damper, and anti-roll bar to the wheel assembly and had previously been mounted on the upright. This model reveals reduced axial components of load but increases in bending moments sizable enough to reduce the resistance to buckling of any member in compression.
The third stage of model development incorporates the steer angle that must be present in loading scenarios that involve some level of cornering. An analysis of the vehicle trajectory that includes the effects of slip angle is presented and used to determine the most likely steer angle the vehicle will experience under cornering. The FE model was adapted to include the movement of the steering linkage caused by driver input. This movement changes the angle of the upright and steering linkage as well as the angle at which wheel loads are applied to the suspension. This model results in a dramatic change in member loads for loading cases that involve a component of steering input. Finally, the FE model was further enhanced to account for vertical movement of the suspension as allowed by the spring and damper assembly. The quasi-static loading scenarios are used to determine any member loading change due to vertical movement. The FE model is also used to predict the amount of vertical movement expected at the wheel center. This data can be used by the suspension designer to determine if changes to the spring rate or anti-roll bar stiffness will result in a more desirable amount of wheel movement for a given loading condition. This model shows that there is no change in the member loads due to the vertical movement of the wheel.
This thesis concludes by presenting the most important changes that must occur in member load calculations to determine the proper suspension loading under a variety of loading scenarios. Finally, a discussion of future research is offered including the importance of each area in determining suspension loads and recommendations on how to perform this research.
Master of Science
Figueiredo, Tiago Petermann. "Effect of lubricant propertieson the friction coefficient under different temperatures, speeds and loads using a ball-on-disc test." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3151/tde-16032017-102949/.
Повний текст джерелаO presente estudo tem o objetivo de avaliar o efeito de propriedades dos lubrificantes sobre o coeficiente de atrito. Para tanto foram testados três lubrificantes diferentes (dois sintéticos e um mineral), que são utilizados em transmissões automotivas. Os experimentos foram conduzidos utilizando um sistema tribológico denominado \"ball-on-disc\". Os discos foram fabricados com as mesmas propriedades mecânicas das engrenagens de transmissão, já as esferas foram fabricadas com aço SAE 52100. Os parâmetros de teste foram definidos com base na análise dinâmica conduzida utilizando o software \"ISOCAD\", que leva em conta a geometria da engrenagem e a dinâmica do veículo (força aplicada e velocidade) durante os ensaios tribológicos. Para definir os parâmetros de temperatura, foram utilizadas as mesmas temperaturas encontradas durante o ensaio de economia de combustível padronizado. Experimentos foram realizados em duas condições de lubrificação diferentes: i) fornecimento limitado de lubrificante, ou \"Starved\" e ii) condição de lubrificação imersa, ou \"Fully flooded\". Depois dos parâmetros definidos, foi possível calcular a espessura de filme de óleo, de forma a definir o regime de lubrificação alcançado em cada condição. Lubrificação mista e limítrofe foi obtida todas as condições de testes. Os resultados mostraram a relação entre a velocidade e o filme de óleo específico usando uma formulação de Khonsari e Masjedi (2014), que leva em conta o efeito da rugosidade da superfície e baseia-se na formulação de Downson e Higginson (1981). A análise química do lubrificante mostrou que existe uma relação entre o coeficiente de atrito e os aditivos utilizados nos lubrificantes. Estes resultados também mostram o desempenho dos lubrificantes em diferentes temperaturas, velocidades e cargas. Os melhores resultados foram obtidos para um lubrificante sintético.
Arvidsson, Therese. "Train–Bridge Interaction : Literature Review and Parameter Screening." Licentiate thesis, KTH, Bro- och stålbyggnad, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-144843.
Повний текст джерелаNya järnvägslinjer byggs kontinuerligt och befintliga linjer uppgraderas. Det finns därför ett behov av forskning inriktad på effektiv design av de bärande konstruktionerna. Alltmer avancerade beräkningsmetoder kan vara motiverade, särskilt i projekt där stora besparingar kan erhållas från att verifiera att befintliga konstruktioner kan bära ökade axellaster och högre hastigheter. Föreliggande avhandling behandlar broars dynamiska respons under belastning av gods- och passagerartåg. Huvudfokus är att studera modelleringsalternativ för tåglasten och vilka konsekvenser de har för utvärderingen av brobanans vertikala acceleration. För att garantera trafiksäkerhet vid höga tåghastigheter definierar de europeiska normerna en maximalt tillåten vertikal acceleration i brobanan. Genom att beakta tåg-bro-interaktion, där tågkomponenterna modelleras som avfjädrade stela kroppar istället för konstanta punktlaster, kan en minskning av brons respons erhållas. Reduktionen av brobanans acceleration är typiskt mellan 5 och 20% för broar med en spännvidd på upp till 30 m. Minskningen kan vara högre för vissa tåg-brosystem och kan vara viktigt också för spännvidder över 30 m. Denna avhandling syftar till att klargöra för vilka kombinationer av tåg-broparametrar effekten av tåg-bro-interaktion är viktig. I detta syfte har en omfattande litteraturstudie genomförts inom området tåg-spår-brodynamik. De styrande parametrarna i 2D tåg-brosystem har studerats vidare i en parameterstudie. Två-nivå faktorförsök har tillämpats för att studera effekten av parametervariationer samt den ytterligare effekten av samtidiga förändringar i flera parametrar. Effekten av valet av lastmodell sattes därmed i relation till effekten av andra parametervariationer. Resultaten visar att resonans kan uppstå från godstrafik inom ett realistiskt hastighetsintervall (< 150 km/h). Vid dessa resonanstoppar kan en betydande minskning av broresponsen erhållas med en tåg-bro-interaktionsmodell. Från studien av nyckelparametrar kan man vidare dra slutsatsen att reduktionen som erhålls med en tåg-bro-interaktionsmodell beror på flera systemparametrar, både för gods- och passargerartåg. Enligt de europeiska normernas rekommendationer för dynamisk kontroll av broar för passagerartrafik kan en ökad brodämpning introduceras som ett förenklat sätt att ta hänsyn till minskningen från tåg-bro-interaktion. Mängden tilläggsdämpning anges idag som en funktion av enbart brons spännvidd, vilket är en grov förenkling. Det arbete som presenteras i denna avhandling visar på behovet av en förbättrad definition av tilläggsdämpningen.
QC 20140429
Kopca, Filip. "Vliv parametrů odpružení a tlumení na jízdní vlastnosti vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318519.
Повний текст джерелаMattlet, Benoit. "Potential benefits of load flexibility: A focus on the future Belgian distribution system." Doctoral thesis, Universite Libre de Bruxelles, 2018. https://dipot.ulb.ac.be/dspace/bitstream/2013/271127/5/contratBM.pdf.
Повний текст джерелаDoctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Fauriat, William. "Stochastic modeling of road-induced loads for reliability assessment of chassis and vehicle components through simulation." Thesis, Clermont-Ferrand 2, 2016. http://www.theses.fr/2016CLF22689/document.
Повний текст джерелаIn order to design vehicle components that will achieve a prescribed reliability target, it is imperative to possess a precise description of the variability of the loads to which such components may be subjected within the environment in which they are used. The strong diversity of the loads imposed on different vehicles by different customers, or on a particular vehicle throughout its life, constitutes a formidable statistical challenge. Generally, the acquisition of information about the load variability experienced by vehicle components is based on the use of load measurement campaigns. The complexity, duration and cost of such campaigns naturally limit the size of the statistical samples that may be collected. Moreover, the recorded load histories are inevitably dependent on the vehicle used for the measurements.The work presented within this manuscript explores the possibility of a fundamental change in the approach to load characterisation. The objective is to make use of simulation rather than measurements and focus statistical analysis efforts not directly on load variability itself but on the variability of the factors that determine such loads. Stochastic models are proposed to describe the evolution of the geometry of road surfaces covered by vehicles, as well as the evolution of vehicles’ speed on those road surfaces. The characterisation of the variability of such factors is performed in combination with the use of life situations. The latter may be employed to divide the load histories associated to different vehicles, within a population of customers, and analyse their variation more easily. Eventually, the dynamic response of the vehicle to the excitation imposed by the road can bederived through simulation.Statistical data on the variation of the road and speed factors obviously have to be acquired in order to apply the methodology. For example, road-related information may be obtained through the use of a road profile estimation algorithm proposed within the framework of this manuscript. Such information may then be exploited to constitute, through simulation, an arbitrarily large set of load histories at a very low cost and for any vehicle whose mechanical characteristics are known.The proposed methodology based on simulation enables us to study more extensively the variability of road-induced fatigue loads, the influence of the different factors that determine such loads, as well as the effect they have on the reliability of any considered vehicle component
Richier, Mathieu. "Conception de dispositifs actifs de maintien de stabilité pour les véhicules évoluant en milieux naturels." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2013. http://tel.archives-ouvertes.fr/tel-01066614.
Повний текст джерелаKaroumi, Raid. "Response of cable-stayed and suspension bridges to moving vehicles : Analysis methods and practical modeling techniques." Doctoral thesis, KTH, Byggkonstruktion, 1998. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2764.
Повний текст джерелаQC 20100511
Katariya, Ashish Santosh. "Dynamic modeling and feedback control with mode-shifting of a two-mode electrically variable transmission." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45825.
Повний текст джерелаÖhrman, Jakob. "Evaluation of a CFD method for estimating aerodynamic loads on external stores on JAS 39 Gripen." Thesis, Umeå universitet, Institutionen för fysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-44380.
Повний текст джерелаLastbestämning för yttre utrustning på stridsflygplan är en viktig uppgift för att tillverkarna ska kunna garantera säkerheten för sina flygplan. Då antalet möjliga utrustningskombinationer är mycket stort, kan inte vindtunneltester – normalt den främsta metoden för att erhålla lastdata – utföras för alla konfigurationer. Således behövs kompletterande metoder för att skatta laster. Ett alternativ är att använda data från en annan utrustning och anpassa den, med hjälp av så kallade skalningsmetoder, till den icke-testade utrustningen. I detta examensarbete behandlas en skalningsmetod som kombinerar resultaten från numeriska strömningsberäkningar – så kallade CFD-simuleringar – för både en testad och en icke-testad utrustning med befintliga vindtunneldata för den testade utrustningen. Metoden undersöks grundligt för ett antal olika utrustningar, anfallsvinklar, sidanblåsningsvinklar och Machtal. Prestandan hos den föreslagna skalningsmetoden utvärderas i relation till nu använda skalningsmetoder, baserat på icke-parametrisk och multivariat statistik. Resultaten visar inga definitiva förbättringar av prestanda för den föreslagna skalningsmetoden jämfört med de nuvarande metoderna. Även om den föreslagna metoden är något mer konservativ, så föranleder betydande variationer i skattningar och en ökad tidsåtgång för skalning författaren att avråda från att använda den föreslagna metoden för skalning av luftlaster på yttre utrustning.
Barreto, Marco Antonio Zanussi. "Dinâmica longitudinal : efeitos da geometria de suspensão nas mudanças de atitude da massa suspensa e os esforços nos elementos da suspensão." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-22122005-165842/.
Повний текст джерелаThis work has objective study the influence of suspension geometry on the sprung mass attitudes. It presents a confrontation among works and authors and this segmented in three parts; where in the first part the basic concepts are defined, dive, squat, lift, anti-dive, anti-squat, anti-lift and equivalent trailing-arm; in the second part the limitations are presented and the new concepts are defined for R. S. Sharp and in the third part are presented the bidimensional dynamic model introduced by Fu-Cheng Wang. It presents a virtual model in system of multi-bodies developed in the program ADAMS, with all the subsystems that composes a complete vehicle. It innovates when bringing such object to study one vehicle of competition (formula SAE) that it has a particularity suspension system push-rod. It surprises with results because its opposite of the basic concepts which is present in the majority of books
Chang, Meng-Koong, and 張孟孔. "Interaction Model of Pavement Roughness and Vehicle Dynamic Load." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/60636354337792014902.
Повний текст джерелаYAN, YU-XING, and 顏育星. "Development of Dynamic Balancing Vehicle with Double Wheel Load." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/w25wpz.
Повний текст джерелаchih, Wang chiao, and 王喬智. "The dynamic simulation and analyses of heavy load vehicle suspension system." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/84313186901592113485.
Повний текст джерела國防大學中正理工學院
造船工程研究所
92
In this research, the important equipments and weapon systems are put in the heavy load vehicle. The heavy load vehicle will run on different roads. Therefore, the kinematic performance and safety of the vehicle are very important. Reducing the part damage, which is induced by dynamic load of the heavy load vehicle, becomes very important issue. The comfort of human being is not so significant. The 3-dimensional model of the heavy load vehicle is established, simulated, and analyzed in ADAMS (Automatic Dynamic Analysis of Mechanical System). The analyses of suspension system, which were made in ADAMS, are only in bicycle and motorcycle in previous researches. There are only few analyses of suspension system, made in ADAMS, focusing on heavy load vehicle. Therefore, in this research the analysis of suspension system of heavy load vehicle is focused on varied suspension parameters and different roads. The dynamic response of the centers of the vehicle body and cargo are also taken into account. The active control is not put into the suspension system in this research. ADAMS is applied to simulate the dynamic behavior on different roads. The varied K (coefficient of stiffness) and C (coefficient of damper) of the suspension system are continuously utilized in the simulation. Finally, the balance between smooth and stability of the maneuver are obtained in order to get the best effect on reducing vibration.
林威呈. "Investigation of Impact Load on Bridge Girders Using Dynamic Vehicle Loading." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/29794523578033601699.
Повний текст джерела逢甲大學
土木工程學系
102
Transportation construction is a crucial indicator of the economic development of a country. Excellent transportation system planning enhances the convenience of transportation and substantially benefits national economy. All processes involving material logistics, supplying resources, and product delivery rely on a comprehensive transportation system. Therefore, bridge construction is essential in transportation construction projects, and bridge designs are the crucial basis of bridge constructions. In this study, we examined the impact load of various factors on bridge girders and investigated five factors, namely the structural system of bridges (simply supported single-span beams and two-span continuous beams), span distance, wheelbase between the central and rear wheels of a standard HS20-44 truck, truck speed, and damping ratio. Subsequently, finite element analysis software (SAP2000) was adopted to establish a series of bridge girder models. Finally, the impact coefficients obtained in this study were used to investigate the impact load of dynamic vehicles on bridge girders. The results indicated that the impact coefficients were proportional to span distance and the wheelbase and speed of the truck. Furthermore, the models developed in this study conformed to the impact coefficient regulations stipulated in the bridge design specification for highways.
Shen, Zhaohui. "Modeling of dynamic friction in vibration environment for heavy vehicle load security." Thesis, 2003. http://spectrum.library.concordia.ca/1939/1/MQ77703.pdf.
Повний текст джерелаTrikha, Manish. "Dynamics And Stability Of A Launch Vehicle." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/1269.
Повний текст джерелаLi, Hongyi. "Dynamic response of highway bridges subjected to heavy vehicles." 2005. http://etd.lib.fsu.edu/theses/available/etd-11092005-171029.
Повний текст джерелаIncludes vita. Includes bibliographical references (p. 140-144). Also available online via the Florida State University ETD Collection website (http://etd.lib.fsu.edu/).
Bansode, Swapnil Pravin. "Modeling Of Multibody Dynamics In Formula SAE Vehicle Suspension Systems." Thesis, 2020. http://hdl.handle.net/1805/22737.
Повний текст джерелаIndiana University–Purdue University Indianapolis student team Jaguar has been participating in the electric Formula SAE (FSAE) vehicle competitions in the past few years. There is an urgent need to develop a design tool for improving the performance of the vehicle. In this thesis, multibody dynamics (MBD) models have been developed which allow the student team to improve their vehicle design, while reducing the required time and actual testing costs. Although there were some studies about MBD analyses for vehicles in literature, a detailed modeling study of key parameters is still missing. Specifically, the effect of suspension system on the vehicle performance is not well studied. The objective of the thesis is to develop an MBD based model to improve the FSAE vehicle’s performance. Based on the objective and knowledge gap, the following research tasks are proposed: (1) MBD modeling of current suspension systems; (2) Modification of suspension systems, and (3) Evaluation of performance of modified suspension systems. The models for the front suspension system, rear suspension system, and full assembly are created, and a series of MBD analyses are conducted. The parameters of the vehicle by conducting virtual tests on the suspension model and overall vehicle model are studied. In this work, two main virtual tests are performed. First, parallel wheel travel test on suspension system, in which the individual suspension system is subject to equal force on both sides. The test helps understand the variation in stability parameters, such as camber angle, toe angle, motion ratio, and roll center location. Second, skid-pad test on full assembly of the vehicle. The test assists in understanding the vehicle’s behavior in constant radius cornering and the tire side slip angle variation, as it is one of the important parameters controlling alignment of the vehicle in this test. Based on the vehicle’s dynamics knowledge obtained from the existing vehicle, a modified version of the FSAE vehicle is proposed, which can provide a better cornering performance with minimum upgrades and cost possible. Based on the results from the parallel wheel travel test and skid-pad test, the lateral load transfer method is used to control the vehicle slip, by making changes to the geometry of the vehicle and obtaining appropriate roll center height for both front and rear suspension system. The results show that the stiffness in front suspension system and rear suspension system are controlled by manipulating roll center height. This study has provided insightful understanding of the parameters and forces involved in suspension system and their variations in different events influencing vehicle stability. Moreover, the MBD approach developed in this work can be readily extended to other commercial vehicles and sports vehicles.
Tsao, Hsin-Wen, and 曹馨文. "The Dynamic Loads of Pavements When A Vehicle Passing A Bump." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/08919530180022781582.
Повний текст джерела國立成功大學
土木工程學系碩博士班
93
Patching on roads results in pavement irregularity, and this makes an additional dynamic load to both vehicle and pavement systems. Dynamic load is the key factor for stress and life assessment of pavement. Because the vehicle and pavement interact as a coupled system, the dynamic response cannot be solved with either isolated pavement system or vehicle kinematic formation. A 2-D interacting model was constructed with ABAQUS to investigate how the pavement-vehicle parameters affect the dynamic responses. A quarter car model was constructed to simulate a moving load sliding on pavement with surface roughness. Besides the mass of the vehicle carriage, the tire of the quarter car was given an isolated mass as a real car. In order to make the contact interaction more factually, a linear spring was adopted to model the tire elasticity. The pavement-vehicle interacting model was also given different conditions and compared with each other to find out an optimum model.
(8812358), SWAPNIL PRAVIN BANSODE. "Modeling of Multibody Dynamics in Formula SAE Vehicle Suspension Systems." Thesis, 2020.
Знайти повний текст джерелаKefayati, Mahdi. "Harnessing demand flexibility to minimize cost, facilitate renewable integration, and provide ancillary services." Thesis, 2014. http://hdl.handle.net/2152/25987.
Повний текст джерелаtext