FSAE赛车双横臂式前悬架设计(全套含CAD图纸和部分三维参考图)
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fsae
赛车
双横臂式前
悬架
设计
全套
cad
图纸
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部分
部份
三维
参考
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1附录KINEMATICCHARACTERIZATIONANDOPTIMIZATIONOFVEHICLEFRONTSUSPENSIONDESIGNBASEDONADAMSABSTRACTTOIMPROVETHESUSPENSIONPERFORMANCEANDSTEERINGSTABILITYOFLIGHTVEHICLES,WEBUILTAKINEMATICSIMULATIONMODELOFAWHOLEINDEPENDENTDOUBLEWISHBONESUSPENSIONSYSTEMBYUSINGADAMSSOFTWARE,CREATEDRANDOMEXCITATIONSOFTHETESTPLATFORMSOFRESPECTIVELYTHELEFTANDTHERIGHTWHEELSACCORDINGTOACTUALRUNNINGCONDITIONSOFAVEHICLE,ANDEXPLOREDTHECHANGINGPATTERNSOFTHEKINEMATICCHARACTERISTICPARAMETERSINTHEPROCESSOFSUSPENSIONMOTIONTHEIRRATIONALITYOFTHESUSPENSIONGUIDINGMECHANISMDESIGNWASPOINTEDOUTTHROUGHSIMULATIONANDANALYSIS,ANDTHEEXISTENTPROBLEMSOFTHEGUIDINGMECHANISMWEREOPTIMIZEDANDCALCULATEDTHERESULTSSHOWTHATALLTHEFRONTWHEELALIGNMENTPARAMETERS,INCLUDINGTHECAMBER,THETOE,THECASTERANDTHEINCLINATION,ONLYSLIGHTLYCHANGEWITHINCORRESPONDINGALLOWABLERANGESINDESIGNBEFOREANDAFTEROPTIMIZATIONTHEOPTIMIZATIONREDUCESTHEVARIATIONOFTHEWHEELCENTERDISTANCEFROM4701MMTOACHANGEOF828MMWITHINTHEALLOWABLERANGEOF10MMTO10MM,PROMISINGANIMPROVEMENTOFTHEVEHICLESTEERINGSTABILITYTHEOPTIMIZATIONALSOCONFINESTHEFRONTWHEELSIDEWAYSSLIPPAGETOAMUCHSMALLERCHANGEOF223MMTHISHELPSTOGREATLYREDUCETHEWEAROFTIRESANDASSURETHESTRAIGHTRUNNINGSTABILITYOFTHEVEHICLEKEYWORDSVEHICLESUSPENSIONVEHICLESTEERINGRIDINGQUALITIESINDEPENDENTDOUBLEWISHBONESUSPENSIONKINEMATICCHARACTERISTICPARAMETERWHEELCENTERDISTANCEFRONTWHEELSIDEWAYSSLIPPAGE1INTRODUCTIONTHEFUNCTIONOFASUSPENSIONSYSTEMINAVEHICLEISTOTRANSMITALLFORCESANDMOMENTSEXERTEDONTHEWHEELSTOTHEGIRDERFRAMEOFTHEVEHICLE,SMOOTHTHEIMPACTPASSINGFROMTHEROADSURFACETOTHEVEHICLEBODYANDDAMPTHEIMPACTCAUSEDVIBRATIONOFTHELOADCARRYINGSYSTEMTHEREAREMANYDIFFERENTSTRUCTURESOFVEHICLESUSPENSION,OFWHICHTHEINDEPENDENTDOUBLEWISHBONESUSPENSIONISMOSTEXTENSIVELYUSEDANINDEPENDENTDOUBLEWISHBONE2SUSPENSIONSYSTEMISUSUALLYAGROUPOFSPACERSSRREVOLUTEJOINTSPHERICALJOINTSPHERICALJOINTREVOLUTEJOINTFOURBARLINKAGEMECHANISMSITSKINEMATICRELATIONSARECOMPLICATED,ITSKINEMATICVISUALIZATIONISPOOR,ANDPERFORMANCEANALYSISISVERYDIFFICULTTHUS,RATIONALSETTINGSOFTHEPOSITIONPARAMETERSOFTHEGUIDINGMECHANISMARECRUCIALTOASSURINGGOODPERFORMANCEOFTHEINDEPENDENTDOUBLEWISHBONESUSPENSIONTHEKINEMATICCHARACTERISTICSOFSUSPENSIONDIRECTLYINFLUENCETHESERVICEPERFORMANCEOFTHEVEHICLE,ESPECIALLYSTEERINGSTABILITY,RIDECOMFORT,TURNINGEASE,ANDTIRELIFEINTHISPAPER,WEUSEDADAMSSOFTWARETOBUILDAKINEMATICANALYSISMODELOFANINDEPENDENTDOUBLEWISHBONESUSPENSION,ANDUSEDTHEMODELTOCALCULATEANDOPTIMIZETHEKINEMATICCHARACTERISTICPARAMETERSOFTHESUSPENSIONMECHANISMTHEOPTIMIZATIONRESULTSAREHELPFULFORIMPROVINGTHEKINEMATICPERFORMANCEOFSUSPENSION2MODELINGINDEPENDENTDOUBLEWISHBONESUSPENSIONTHEPERFORMANCEOFASUSPENSIONSYSTEMISREFLECTEDBYTHECHANGESOFWHEELALIGNMENTPARAMETERSWHENTHEWHEELSJUMPTHOSECHANGESSHOULDBEKEPTWITHINRATIONALRANGESTOASSURETHEDESIGNEDVEHICLERUNNINGPERFORMANCECONSIDERINGTHESYMMETRYOFTHELEFTANDRIGHTWHEELSOFAVEHICLE,ITISAPPROPRIATETOSTUDYONLYTHELEFTORTHERIGHTHALFOFTHESUSPENSIONSYSTEMTOUNDERSTANDTHEENTIREMECHANISM,EXCLUDINGTHEVARIATIONOFWCDWHEELCENTERDISTANCEWEESTABLISHEDAMODELOFTHELEFTHALFOFANINDEPENDENTDOUBLEWISHBONESUSPENSIONSYSTEMASSHOWNINFIGURE13KINEMATICSIMULATIONANALYSISOFSUSPENSIONMODELCONSIDERINGTHEMAXIMUMJUMPHEIGHTOFTHEFRONTWHEEL,WEPOSITIONEDTHEDRIVESONTHETRANSLATIONALJOINTSBETWEENTHEGROUNDANDTHETESTPLATFORM,ANDIMPOSEDRANDOMDISPLACEMENTEXCITATIONSONTHEWHEELSTOSIMULATETHEOPERATINGCONDITIONSOFAVEHICLERUNNINGONANUNEVENROADSURFACETHEMEASUREDROADROUGHNESSDATAOFTHELEFTANDRIGHTWHEELSWERECONVERTEDINTOTHERELATIONSHIPBETWEENTIMEANDROADROUGHNESSATACERTAINVEHICLESPEEDTHESPLINEFUNCTIONCUBSPLINADAMSWASUSEDTOFITANDGENERATEDISPLACEMENTTIMEHISTORYCURVESOFEXCITATIONTHESIMULATIONRESULTSOFTHESUSPENSIONSYSTEMBEFOREOPTIMIZATIONAREILLUSTRATEDINFIGURE2THECAMBERANGLE,THETOEANGLE,THECASTERANGLEANDTHEINCLINATIONANGLECHANGEONLY3SLIGHTLYWITHINTHECORRESPONDINGDESIGNEDRANGESWITHTHEWHEELJUMPINGDISTANCETHISINDICATESANUNDERSTEERINGBEHAVIORTOGETHERWITHANAUTOMATICRETURNABILITY,GOODSTEERINGSTABILITYANDSAFETYINARUNNINGPROCESSHOWEVER,WCDDECREASESFROM184997MMTO189698MMANDFWSSFROM1648MMTO699MM,SHOWINGREMARKABLEVARIATIONSOF4701MMAND2347MM,RESPECTIVELYCHANGESSOLARGEINWCDANDFWSSAREADVERSETOTHESTEERINGEASEANDSTRAIGHTRUNNINGSTABILITY,ANDCAUSEQUICKWEAR,THUSREDUCINGTIRELIFEFORINDEPENDENTSUSPENSIONS,THEVARIATIONOFWCDCAUSESSIDEDEFLECTIONOFTIRESANDTHENIMPAIRSSTEERINGSTABILITYTHROUGHTHELATERALFORCEINPUTESPECIALLYWHENTHERIGHTANDTHELEFTROLLINGWHEELSDEVIATEINTHESAMEDIRECTION,THEWCDCAUSEDLATERALFORCESONTHERIGHTANDTHELEFTSIDESCANNOTBEOFFSETANDTHUSMAKESTEERINGUNSTABLETHEREFORE,WCDVARIATIONSHOULDBEKEPTMINIMUM,ANDISREQUIREDINSUSPENSIONDESIGNTOBEWITHINTHERANGEFROM10MMTO10MMWHENWHEELSJUMPITISOBVIOUSTHATTHEWCDOFNONOPTIMIZEDSTRUCTUREOFTHESUSPENSIONSYSTEMGOESBEYONDTHISRANGETHESTRUCTURENEEDSMODIFYINGTOSUPPRESSFWSSANDTHECHANGEOFWCDWITHTHEWHEELJUMPINGDISTANCEADMASSOFTWAREISASTRONGTOOLFORPARAMETEROPTIMIZATIONANDANALYSISITCREATESAPARAMETERIZATIONMODELBYSIMULATINGWITHDIFFERENTVALUESOFMODELDESIGNVARIABLES,ANDTHENANALYZESTHEPARAMETERIZATIONBASEDONTHERETURNEDSIMULATIONRESULTSANDTHEFINALOPTIMIZATIONCALCULATIONOFALLPARAMETERSDURINGOPTIMIZATION,THEPROGRAMAUTOMATICALLYADJUSTSDESIGNVARIABLESTOOBTAINAMINIMUMOBJECTIVEFUNCTION810TOREDUCETIREWEARANDIMPROVESTEERINGSTABILITY,THETABLE1VALUESOFCAMBERANGLE,TOEANGLE,CASTERANGLEANDINCLINATIONANGLEBEFOREANDAFTEROPTIMIZATIONTABLE1THEDATATABLESOFOPTIMIZETHERESULTS4CONCLUSIONS4THEWHOLEKINEMATICSIMULATIONMODELOFANINDEPENDENTDOUBLEWISHBONESUSPENSIONSYSTEMBUILTBYUSINGADAMSSOFTWAREWITHTHELEFTANDTHERIGHTSUSPENSIONPARTSUNDERRANDOMEXCITATIONSCANIMPROVETHECALCULATIONPRECISIONBYADDRESSINGTHEMUTUALIMPACTSOFKINEMATICCHARACTERISTICPARAMETERSOFTHELEFTANDTHERIGHTSUSPENSIONPARTSUNDERRANDOMEXCITATIONSTHEOPTIMIZATIONCANOVERCOMETHEPROBLEMOFTHETOOLARGEVARIATIONOFWCDANDOVERLYLARGEFWSSWITHTHEWHEELJUMPINGDISTANCETHEKINEMATICCHARACTERISTICPARAMETERSOFTHESUSPENSIONSYSTEMREACHANIDEALRANGE,DEMONSTRATINGTHATTHEOPTIMIZATIONPROTOCOLISFEASIBLEFROMAPRACTICALPERSPECTIVE,THEOPTIMIZATIONISEXPECTEDTOREDUCETIREWEAR,ANDREMARKABLYIMPROVESUSPENSIONPERFORMANCEANDVEHICLESTEERINGSTABILITYFIGURE1SIMPLEPICTUREOFSUSPENSIONFIGURE2CURVEWITHTHEPARAMETERSOFTHESUSPENSION5基于ADAMS前悬架优化设计摘要为了提高轻型车辆性能和行驶稳定,我们使用ADAMS软件建立一个独立双横臂悬架系统运动仿真模型,并建立随机激励的测试平台,根据车辆实际运行条件,探讨悬架的运动学特征参数的变化。通过仿真和优化的可以对悬架设计进行相关的指导。试验表明,所有的前轮定位参数,包括前轮前束角,主销内倾角,注销后倾角,前轮外倾角都可以得到优化。例如只要在仿真前或后改变一个很小的量,车轮中心距就可以从减小到许用范围从而改善了车辆的操纵稳定性。此外M0147M10还优化了前轮侧向滑动量,使之减小到,更有助于减少轮胎磨损,保证车辆23的行驶稳定性。关键词汽车悬架;车辆转向;驾驶性能;独立双横臂悬架;运动学特征参数;轮中心距;前轮侧向滑移1简介汽车悬架的功用时承受来自地面传至车身的冲击,保证车辆在行驶过程中的操纵稳定性和平顺性的系统。悬架有很多种类,其中双横臂独立悬架时应用最为广泛的一种。独立的双横臂悬挂系统通常是一组空间四连杆机制。其运动关系复杂,性能分析是非常困难。因此,合理的设置参数对指导其设计是至关重要的。为确保汽车具有良好的性能,特别是操纵稳定性,乘坐舒适,转向缓和,轮胎寿命。因此对悬架的设计时非常重要的。在本文中,我们使用ADAMS软件建立一个独立的双横臂悬挂系统的运动学分析模型,并利用该模型计算和优化的运动特征参数。优化的结果,有助于知道我们对悬架的设计。2独立双横臂悬架的建模当车轮跳东时悬挂系统的性能受到车轮定位参数变化的影响。这些变化应保持在合理的范围,以保证所设计的车辆行驶性能。考虑到独立悬架的左,右车轮是对称的,因此我们只要研究左侧或右侧的悬挂系统,就可以了解整个悬架系统,但不包括车轮中心的距离的变化。我们建立一个如图1所示的模型,此模型为独立双横臂悬挂系统的左侧系统。3悬架模型运动学仿真分析考虑到前轮最大的跳动高度,我们在地面和测试平台放置一个上、下运动的驱动幅,并加上车辆在路面上实际运动时上、下运动的关系加上随机激励。实测的道路粗糙度数据是根据左,右车轮在一定时间内、一定车速和路面的不平度转化的。并对样条函数斯进行了拟合,并产生位移时程曲线的激励。经过仿真可以6
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