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1、WaystoreducevehiclenoiseWiththerapiddevelopmentofautomobileindustry,thereiscomfortandvehiclevibrationandnoisecontrolofmoreandmorestringentrequirements.Accordingtorelevantdatashowsthat70percentofthecitynoisefromthetrafficnoise,andtrafficnoiseismainlycarnoise.I
2、tisseriouslypollutingtheurbanenvironment,affectingpeople'slife,workandhealth.Sonoisecontrolisnotonlyrelatedtocomfort,butalsorelatedtoenvironmentalprotection.However,allalsofromthevibrationnoise,vibrationcancausecertainpartsoftheearlyfatiguedamage,therebyreduc
3、ingtheservicelifeofmotorvehicles;excessivenoisecandamagehearingthedriverwillenabletherapiddriverfatigue,thusdrivingsecurityconstitutesagravethreat.Sonoisecontrol,isalsorelatedtomotorvehicledurabilityandsafety.Thusvibration,noiseandcomfortarethethreecloselyrel
4、ated,itisnecessarytoreducevibration,reducenoise,butalsoimproveridecomfort,andensuretheproducteconomy,vehiclenoisecontrolinthestandardrange.Onetypeofnoisearisingfromcarnoisearethemainfactorsofairpower,mechanicaldrive,theelectromagneticthreeparts.Fromthestructu
5、recanbedividedintotheengine(ie,combustionnoise),thechassisnoise(ie,powertrainnoise,allcomponentsconnectedwiththenoise),electricalequipment,noise(coolingfannoise,carnoisegenerator),bodynoise(suchasbodystructure,shapeandattachmentinstallationunreasonablenoise).
6、Oneoftheenginenoiseaccountedformorethanhalfofmotorvehiclenoise,includingnoiseandbodyintakenoise(suchasenginevibration,therotationalaxisValve,Jin,doorswitches,suchasexhaustnoise).Thereforetheenginevibration,noisereductionhasbecomeakeyautomotivenoisecontrol.noi
7、serequirementsofregulationsinEurope,fromOctober1996onwards,theexternalbus77dBAnoisemustbereducedto74dBA,noisewasreducedbyhalfenergy,theendofthecenturyfurtherreducedto71dBA.Japan'slawsandregulations,smallcarinthenextdecadetocontrolnoisestandardsatthefollowing7
8、6dBA.Anumberofdomesticcitiesarealsoplanningtotraffictrunklinesin2010tocontrolnoiseattheaverageoflessthan70dBA.Accordingtothedomesticcurrentdataindicatethatthedomesticvalueofbusnoisepermit
