钢轨波磨对车辆动力学性能的影响Effectofrailwavegrindingonvehicledynamicperformance中文摘要摘要：本文以国内CRH380B型高速动车组拖车为研究对象，对其在不同速度时通过不同波长、波深的钢轨波磨路段下的动力学性能做了初步探究。将实测的钢轨表面不平度表示为周期谐波磨损，利用MATLAB软件进行连续谐波仿真，将输出的连续谐波模拟波磨作为轮轨间的激励。然后定义SIMPACK的多体模型，计算车辆在一定时间范围内通过钢轨波磨路段时的车辆轮轨垂向力和轴箱垂向加速度。最后依据计算机仿真模拟结果，对车辆的轮轨垂向力和轴箱垂向的加速度结果进行了比较分析，得出以下结论：（1）基于多体动力学原理和SIMPACK软件，成功地建立了由一个刚体、两个支点、四组车轮和八个轴箱组成的多体动力学模型。（2）并结合减速法对模型进行了临界速度分析；（3）所有仿真结果中当车辆运行速度为300km/h，钢轨波磨波长为400mm、波深为0.02mm时，所得的车辆轮轨垂向力和轴箱垂向加速度幅值均最大最大振动幅值分别为106KN和39.7m/s2；（4）当面对波磨波长和波深两个条件不变时，车辆轮轨垂向力随着车辆的运行速度增大随之增大，同时速度等级越大时对轮轨垂向力的影响也越大。当速度不变时，车俩的轮轨垂向力与波长呈现反比例变化，即波长逐渐减小而垂向力增大，但是随着波深的增大而增大，两者的变化是不同的；（5）对于轴箱垂向加速度而言，其自身大小随车辆的速度的增大而增大，并且随波深的增大也是增大的，但是与波磨波长成反比，其大小是根据波磨波长的减小而增大的，即波磨波长越小对垂向加速度的影响深度就越深。图33幅，表1个，参考文献21篇。关键词：车辆；钢轨波磨；动力学性能iiiABSTRACTABSTRACT:Inthisarticle,CRH380Bhigh-speedEMUtrailerbecomestheresearchobjectandmakesapreliminarystudyonitsdynamicperformanceunderthewave-wornsectionofrailwithdifferentwavelengthsandwavedepthsatdifferentspeeds.Themeasuredrailsurfaceirregularlywasexpressedasperiodicharmonicwear,andMATLABsoftwarewasusedtooutputcontinuousharmonicanalogwavegrindingastheexcitationbetweenwheelandrail.Then,Simpackwasusedtobuildamulti-rigidbodymodeltocalculatethewheel-railverticalforceandaxleboxverticalaccelerationwhenthevehiclepassedthroughthesectionofrailwavegrinding.Accordingtothesimulationresults,Theverticalforceofthewheelandtheverticalaccelerationofthewheelsetwerecomparedandanalysedandthefollowingconclusionsweredrawn:(1)WiththeprincipleofmultibodydynamicsandtheMultibodyDynamicssoftwareSimpack,amulti-bodydynamicsmodelconsistingofonecarbody,twobogies,fourwheelsetsandeightaxleboxeswassuccessfullyestablished,andthecriticalvelocityofthemodelwasanalyzedbycombiningthedecelerationmethod.(2)Inallthesimulationresults,whenthevehiclerunningspeedis300km/h,therailwavegrindingwavelengthis400mm,andthewavedepthis0.02mm,themaximumamplitudeofwheel-railverticalforceandaxleboxverticalaccelerationobtainedare106kNand39.7m/s2,respectively.(3)Whentherectificationwavelengthandwavelengthremainunchanged,theverticalwheel-railforceincreaseswiththeincreaseofthespeedofmarch,andthegreaterthedegreeofspeed,thegreatertheinfluenceonthewheel-railverticalforceis.Whenthevelocityisconstant,theverticalwheel-railforceincreaseswiththedecreaseofthewavelengthandwiththeincreaseofthewavelength,andthesmallerthewavelengthis,thegreatertheinfluenceofwheel-railverticalforceis.(4)Axleboxverticalaccelerationincreaseswiththeincreaseofvelocity,wavedepthandthedecreaseofgrindingwavelength,andthesmallerthegrindingwavelength,thegreatertheinfluenceonverticalacceleration.KEYWORDS:vehicle;Railwavegrinding;Dynamicperformanceiii目录中文摘要..................................................................IAB...
