本文以某公司纯电动汽车动力总成悬置系统为研究对 象,对纯电动汽车悬置系统特性和对整车NVH 性能的影响进行研究,主要研究 内容如下: 分析了国内外对汽车悬置系统研究现状和电动汽车所受激励,依据悬置隔 振基础理论、系统设计原则和悬置元件特性,确定了电动汽车悬置系统布置方 利用拉格朗日方程方法建立了电动汽车动力总成六自由度悬置系统动力学模型,分别用多体动力学法和数值解法对比分析了动力总成刚体模型模态,确 定原车动力总成前六阶固有频率、主振型及解耦率。针对动力总成模态分析中 解耦率存在耦合振动问题,应用能量解耦法并以提高悬置系统解耦率为目标, 并利用多体动力学法对系统进行了优化分析。 针对优化分析后的悬置系统进行了非线性刚度设计,基于通用汽车28 工况, 利用多体动力学对部分工况进行了分析,得到了动力总成质心位移、悬置弹性 中心点位移、悬置受作用力,同时利用有限元分析软件对悬置支架进行了静、 动态分析,确保悬置非线性刚度设计和支架设计合理性。 针对设计合理悬置样件装车试验,通过LMS.Scadas 前端采集汽车WOT 况下悬置主被动加速度幅值及车内噪声,利用LMSTest.Lab 分析采集数据,对 原状态与优化后结果进行了对比分析。 关键词:电动汽车;动力总成悬置系统;隔振;解耦率 Abstract Abstract increasinglyserious energy crisis environmentalpollution, new energy electric vehicles zeroemission lownoise have become maindevelopment trend automobileindustry.The design rationality powertrainsuspension system electricvehicles, which elasticconnection between directlyaffect wholevehicle NVH (Noise, Vibration Harshness,Noise, Vibration comfort).Atpresent, designmethod powertrainsuspension system traditionalfuel oil vehicle has been mature electricvehicle suspension system preliminarystage, pureelectric vehicle suspension system has certain theoretical applicationvalue.In powertrainsuspension system pureelectric vehicle researchobject suspensionsystem pureelectric vehicle itsinfluence wholevehicle NVH. mainresearch contents paperanalyzes researchstatus vehiclesuspension system layoutplan evsuspension system according basictheory suspensionvibration isolation, system design principle suspensionelement. dynamicmodel 6-dofsuspension system electricvehicle powertrain Lagrangeequation, rigidbody model mode multi-bodydynamics numericalmethod respectively, naturalfrequency, main mode decouplingrate firstsix orders originalpowertrain couplingvibration problem decouplingrate modalanalysis energydecoupling method Abstractdecoupling rate mountedsystem, multi-bodydynamic method system.Suspension system optimizationanalysis nonlinearstiffness design, based workingcondition gm,28, using multi-bodydynamics analyses some conditions powertrainmass center displacement suspensioncenter elasticdisplacement, suspension force, sametime, using finiteelement analysis software mountbracket dynamicanalysis, suspensionnonlinear stiffness bracketdesign rationality. reasonablemount sample loading Test, mountactive passiveacceleration in-carnoise under WOT condition were collected LMS.Scadasfront end, collecteddata were analyzed LMSTest.Lab. Key words: Electric vehicle, Powertrain mount system, Vibration isolation, decouplingrate 1.1