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1、第33卷第3期長(zhǎng)安大學(xué)學(xué)報(bào)(自然科學(xué)版)Vo1.33NO.32013年5月J0urnalofChang’anUniversity(NaturalScienceEdition)Mav.2013文章編號(hào):1671—8879(2013)03—0094—06車速變化對(duì)車輛平順性的影響周玉財(cái),陳士安,何仁(1.青海交通職業(yè)技術(shù)學(xué)院汽車工程系,青海西寧810003;2.江蘇大學(xué)汽車與交通工程學(xué)院,江蘇鎮(zhèn)江212013)摘要:為研究車速變化對(duì)車輛平順性的影響,建立了考慮車速變化時(shí)縱向慣性力影響與白噪聲頻率時(shí)變的路面隨機(jī)輸入1/z車懸架動(dòng)力學(xué)模型。其中,白噪聲頻率時(shí)變的路面輸入模型是利用
2、Matlab/Simulink軟件的LookupTable模塊,針對(duì)實(shí)時(shí)的車輛行駛距離對(duì)空間路面隨機(jī)激勵(lì)模型查表來獲得。數(shù)值仿真結(jié)果表明:車速變化對(duì)輪胎動(dòng)變形、簧載質(zhì)量加速度及車身俯仰角加速度指標(biāo)基本沒有影響,但使懸架動(dòng)撓度指標(biāo)明顯變差,且車速變化越劇烈及懸架剛度越小,上述現(xiàn)象越明顯。采用減小車輛質(zhì)心至0.8倍與增大懸架剛度至1.1倍的改進(jìn)時(shí),犧牲簧載質(zhì)量加速度指標(biāo)6.96%和車身俯仰角加速度指標(biāo)0.89,可使前后懸架動(dòng)撓度指標(biāo)分剮得到2O與17.6的明顯改善。關(guān)鍵詞:汽車工程;平順性;車速變化;路面輸入;頻率;時(shí)變性中圖分類號(hào):U461.4文獻(xiàn)標(biāo)志碼:AInfluenc
3、eofvelocitychangeonridecomfortforvehicleZHOUYu-cai,CHENShi—an2,HERen。(1.DepartmentofAutomotiveEngineering,QinghaiCommunicationsTechnicalCollege,Ximng810003,Qinghai,China;2.SchoolofAutomotiveandTrafficEngineering,JiangsuUniversity,Zhenjiang212013,Jiangsu,China)Abstract:Inordertostudytheinf
4、luenceofvelocitychangeonvehicleridecomfort。takingthein—fluenceoflongitudinalinertiaforceandtime—variantwhitenoisefrequencvfromvehiclevelocitychangeintoaccount,asuspensiondynamicmodelof1/2vehiclewasestablishedwithroadrandominputs.Thetime—variantwhitenoisefrequencymodelwasobtainedbyusingthe
5、LookupTableModuleintheMatlab/SimulinkSoftwarewithroadbythereal—timevehiclespeed.Theresultsshowthatvelocitychangemakestheindexofsuspensiondeflectionbecomeworseobviouslybuthasnoinfluenceontheindexesoftiredeflection,sprungmassaccelerationandbodypitchingan—gleacceleration.Thebiggerthechangeof
6、vehiclespeedandthelessthesuspensionstiffness,themoreobviousthephenomenaabove.Whentheheightofmasscentreisdecreasedby20andthestiffnessesofallspringsareincreasedby10,theverticalandpinchingaccelerationindexesin—creaseby6.96and0.89respectively,andthefrontandrearsuspensiondeflectionindexesdecre
7、aseby2Oand17.6respectively.5tabs,10figs,18refs.Keywords:automobileengineering;ridecomfort;velocitychange;roadrandominput;frequen—cy;time—variant收稿日期:2012—04—20基金項(xiàng)目:國(guó)家自然科學(xué)基金項(xiàng)目(50805066);江蘇省自然科學(xué)基金項(xiàng)目(BK2008553)作者簡(jiǎn)介:周玉財(cái)(1968一),男,青海湟中人,副教授,E-mail:zhouyucai-qh@l63.corn。第3