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1、国产自主品牌汽车车内噪声的识别与控制EPS电机摩擦噪声特性分析与控制83文章编号：1006-1355(2012)04-0083-05EPS电机摩擦噪声特性分析与控制李传兵1,2,闫兵3,雷应锋1,2,李淑静3（1.汽车噪声振动和安全技术国家重点实验室，重庆401120；2.长安汽车工程研究院，重庆401120；3.西南交通大学机械工程学院，成都610031）摘要：电动助力转向系统代替液压助力转向系统是汽车节能减排的重要措施之一，但前者存在噪声相对较大的缺点。针对某型电动助力转向系统在转动方向盘时产生明显异响的问题，采用主观评价
2、与客观数据相结合，实验手段与信号分析相结合的研究方法，识别出噪声源，以及异响信号的时频特性。结果表明，该型电动助力转向系统电机产生噪声的原因，主要是电刷与换向器的摩擦力传递到电机外壳及附近部件上，激起结构振动所辐射的噪声引起的。在针对性地采用减小摩擦激振力和提高电机外壳刚度的措施后，异响明显改善，声学性能明显提高并已优于进口同类电机。关键词：声学；电动助力转向系统；电机；电刷；摩擦噪声中图分类号：TB533+.1文献标识码：ADOI编码：10.3969/j.issn.1006-1355.2012.04.019Analysisa
3、ndControlonFrictionNoiseoftheEPSMotor———————————————————————————————————————————————LIChuan-bing1,2,YANBing3，LEIYing-feng1,2，LIShu-jing3(1.StateKeyLaboratoryofVehicleNVHandSafetyTechnology,Chongqing401120,China;2.AutomobileEngineeringInstituteofChang’anAutomobileCor
4、porationLimite,Chongqing401120,China;3.CollegeofMechanicalEngineering,SouthwestJiaotongUniversity,Chengdu610031，China)———————————————————————————————————————————————Abstract:Thesubstitutionofhydraulicsteeringsystemwithelectricpowersteeringsystemisoneofthemostimporta
5、ntmeasuresofautomobileenergyconservationandemissionreduction,buttheformerexistsrelativebignoiseshortcoming.Fortheproblemoftheabnormalsound,whichisderivedfromaspecificelectricpowersteeringsystemwhenrotatingthesteeringwheel,viaassociatingsubjectiveevaluationswithobjec
6、tivedataandcombiningexperimentswithsignalanalyses,thesourceofnoisewasidentified,thetime-frequencypropertyoftheabnormalsoundsignalwasobtained.Theoutcomeshowsthatthecauseofthenoisederivedfromtheelectricpowersteeringsystemismainlythefrictionalforcebetweentheelectricbru
7、shandthecommutator,whicharousesthestructuralvibrationofthemotorshellanditsnearbyassemblies.Theabnormalsoundoftheelectricpowersteeringsystemwasnotablyreducedbyrestrainingthefractionalforcebetweenthebrushandthecommutatorandenhancingtherigidityofthemotorshell,meanwhile
8、,theacousticalbehaviorwasalsonotablypromoted,andwasbetterthanthatofthesimilarimportedmotors.Keywords:acoustics;EPS;motor;brush;frictionnoi
