资源描述：
《九自由度乘坐动力学模型的人体振动特性仿真_张鄂.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、第10卷第4期交通运输工程学报Vol10No42010年8月JournalofTrafficandTransportationEngineeringAug.2010文章编号:1671-1637(2010)04-0058-07九自由度乘坐动力学模型的人体振动特性仿真1,211张鄂,刘中华,邵晓春(1西安交通大学机械工程学院,陕西西安710049;2西安外事学院汽车工程学院,陕西西安710077)摘要:为高效预测动态环境下人-车系统的人体振动响应特性及汽车乘坐舒适性,依据人-车-路系统间的相互作用和多体动力学原理,建立了9自由度汽车
2、乘坐动力学模型,应用拉格朗日原理推导了乘坐动力学方程。基于路面不平度激励及汽车行驶速度变化,构建了路面随机激励的时域模型。利用MATLAB/Simulink仿真工具,建立了人-车-路系统仿真模型,并对某轻型车辆在不同路面、不同车速下的人体振动响应进行了仿真分析。仿真结果表明:在同样车速下,随着路面等级的降低,人体各部位的加速度响应幅值明显增大;当车辆行驶在随机路面上时,路面不平度随机激励引起的人体振动能量主要集中在低频段,约在5Hz出现第1阶共振频率,大约在10Hz出现第2阶峰值,这与众多试验结果一致。可见,9自由度汽车乘坐动力学模型及其仿真模型,
3、不仅能快速计算动态激励下人体的振动特性和乘坐舒适性,而且具有较好的可信度。关键词:汽车工程;9自由度乘坐动力学模型;人体振动特性;仿真中图分类号:U461.51文献标志码:ASimulationofhumanvibrationcharacteristicsbasedon9-DOFridingdynamicsmodel1,211ZHANGE,LIUZhong-hua,SHAOXiao-chun(1.SchoolofMechanicalEngineering,XianJiaotongUniversity,Xian710049,Shaanxi,
4、China;2.SchoolofAutomobileEngineering,XianInternationalUniversity,Xian710077,Shaanxi,China)Abstract:Topredictthehumanvibrationresponsecharacteristicsandridingcomfortofhuman-vehiclesystemefficiently,a9-DOFridingdynamicsmodelofautomobilewasestablishedaccordingtohuman-vehicle-r
5、oadinteractionandmult-ibodydynamicsprinciple.ThedynamicsequationsofthemodelwerederivedbyusingLagrangePrinciple.Atimedomainmodelofrandomroadexcitationwasestablishedaccordingtorandomroadexcitationandthechangeofvehiclespeed.Ahuman-vehicle-roadsystemsimulationmodelwasestablishedby
6、usingMATLAB/Simulink,andthesimulationandanalysisofhumanvibrationresponseinalightvehicleondifferentroadsandatdifferentspeedswerecarriedout.Simulationresultshowsthattheamplitudeofhumanaccelerationresponsesignificantlyincreaseswiththedropofroadlevelatthesamespeed.Onrandomroad,the
7、energyofhumanvibrationcausedbyrandomroadexcitionconcentratesinlowfrequency,thefirstorderresonancefrequencyappearsaround5Hz,andthesecondorderresonancefrequencyoccursaround10Hz,whichisconsistentwithmanyexperimentalresults.Therefore,the9-DOFdynamicsmodelandthesimulationmodelarere
8、liabletoquicklycomputethevibrationcharacteristicsofhumanandri
