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ID:32192906
大小:2.83 MB
页数:77页
时间:2019-02-01
《汽车车内噪声源识别方法应用分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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