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1、WaystoreducevehiclenoiseWiththerapiddevelopmentofautomobileindustry,thereiscomfortandvehiclevibrationandnoisecontrolofmoreandmorestringentrequirements.Accordingtorelevantdatashowsthat70percentofthecitynoisefromthetrafficnoise,andtrafficnoiseismainlycarnoise.Itisseriousl
2、ypollutingtheurbanenvironment,affectingpeople'slife,workandhealth.Sonoisecontrolisnotonlyrelatedtocomfort,butalsorelatedtoenvironmentalprotection.However,allalsofromthevibrationnoise,vibrationcancausecertainpartsoftheearlyfatiguedamage,therebyreducingtheservicelifeofmot
3、orvehicles;excessivenoisecandamagehearingthedriverwillenabletherapiddriverfatigue,thusdrivingsecurityconstitutesagravethreat.Sonoisecontrol,isalsorelatedtomotorvehicledurabilityandsafety.Thusvibration,noiseandcomfortarethethreecloselyrelated,itisnecessarytoreducevibrati
4、on,reducenoise,butalsoimproveridecomfort,andensuretheproducteconomy,vehiclenoisecontrolinthestandardrange.Onetypeofnoisearisingfromcarnoisearethemainfactorsofairpower,mechanicaldrive,theelectromagneticthreeparts.Fromthestructurecanbedividedintotheengine(ie,combustionnoi
5、se),thechassisnoise(ie,powertrainnoise,allcomponentsconnectedwiththenoise),electricalequipment,noise(coolingfannoise,carnoisegenerator),bodynoise(suchasbodystructure,shapeandattachmentinstallationunreasonablenoise).Oneoftheenginenoiseaccountedformorethanhalfofmotorvehic
6、lenoise,includingnoiseandbodyintakenoise(suchasenginevibration,therotationalaxisValve,Jin,doorswitches,suchasexhaustnoise).Thereforetheenginevibration,noisereductionhasbecomeakeyautomotivenoisecontrol.noiserequirementsofregulationsinEurope,fromOctober1996onwards,theexte
7、rnalbus77dBAnoisemustbereducedto74dBA,noisewasreducedbyhalfenergy,theendofthecenturyfurtherreducedto71dBA.Japan'slawsandregulations,smallcarinthenextdecadetocontrolnoisestandardsatthefollowing76dBA.Anumberofdomesticcitiesarealsoplanningtotraffictrunklinesin2010tocontrol
8、noiseattheaverageoflessthan70dBA.Accordingtothedomesticcurrentdataindicatethatthedomesticvalueofbusnoisepermit
