汽车车内噪声源识别方法应用分析

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1、硕士学位论文=E目!jEj#=}l拿目=目鲁l=目自目E目E}!自=E自=自__目自目i———————————————————————————————————一iII：AbstractTheNVH(Noise，Vibration，Harshness)ofautomobileshasbeenturningtobeacriticalfactorforthecustomers’commentsontheperformanceofautomobiles，SOhowtoreducetheinteriornoisehasb

2、ecometheproblemtobeurgentlyresolvedinordertoimprovethedrivingcomfort．Additionally，itisofgreatimportancetoidentifyinteriornoisesourceconsideringthevariousfactorsaffectingtheinteriornoise．Inthispaper'noisewasidentifiedfromtheperspectiveofnoisesourceidentificat

3、ion，low—frequency，high．frequencyandfull·frequencynoisewereidentifiedrespectively．Andcomparativestudiedontheadvantagesanddisadvantagesofthenoisesourceidentificationtechnology．Themaincontentsarcasfollows：First，Low．frequencynoisesourceidentificationbasedonCAEte

4、chnology．ItfocusesontheapplicationofFEM，BEM，ATVonlow·frequencynoisesourceidentification．Thefiniteelementmodelandboundaryelementmodelwereestablished,andtheFEM，BEMandacoustictransfervector(ATV)methodswererespectivelyusedtopredictthelow—frequencyradiatednoise．B

5、ythecalculationofcontributionofpanels，thepanels’contributioninthepeakfrequencywasdetermined．Besides，themainnoisesourceswereidentifiedandrankedbythepanelcontributionanalysisofsoundpressure．Andthestructuredesignflawswerefound，besidesthedirectivepropositionabou

6、tstructuraloptimizationdesignwasproposed．Throughthestudyonthelow．frequencynoisesourceidentification，theimportanceofvirtualdesignofthevehicledevelopmentwasgreatlyclarified．Second，high·frequencynoisesourceidentificationbasedonSEA．It’Smainlyabouttheapplicationo

7、fSEAinthehigh—frequencynoisesourceidentification．ByestablishingaSEAmodalandapplyingthemeasuredexcitationsource，theinteriorhigh．frequencynoiseofthevehiclewaspredictedsuccessfully．SortingtheinputpowerofinteriornoisewithSEA，themaininputpanelsoftheinteriornoisew

8、asidentified，andthemainthemainhigh—frequencynoisesourcesinsidethecarwareidentifiedfromtheperspectiveofsoundradiationandtransmission．Basedonthese，thefeasiblemeasuresofnoisereductionwereproposed．A