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车身结构振动噪声特性分析与优化.docx

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车身结构振动噪声特性分析与优化 Abstract Withthedevelopmentofautomobileindustry,thenoiseandvibrationofvehiclebodystructurehavegraduallybecomeanimportantresearchdirection.Inthispaper,thevibrationandnoisecharacteristicsofvehiclebodystructureareanalyzedbyusingfiniteelementmethod.Theoptimizationdesignofthevehiclebodystructureiscarriedoutonthebasisoftheanalysisresults.Theoptimizationschemeisverifiedbytheexperimentaltestoftheactualvehicle.Theresultsshowthattheoptimizationdesigncansignificantlyreducethevehiclebodystructurevibrationandnoise,andimprovetheridecomfortofthevehicle. Keywords:vehiclebodystructure;finiteelementanalysis;vibration;noise;optimization 1.Introduction Withtheincreasingdemandforridecomfort,thevibrationandnoiseofvehiclebodystructurehavebecomeakeyfactoraffectingthequalityofthevehicle.Inordertoimprovetheridecomfortofthevehicle,itisnecessarytooptimizethevehiclebodystructuretoreducethevibrationandnoise.Thefiniteelementmethodisaneffectivemethodtoanalyzethevibrationandnoiseofvehiclebodystructure.Bysimulatingthevibrationandnoiseofthevehiclebodystructurethroughfiniteelementmethod,thevibrationandnoisecharacteristicsofthestructurecanbeobtained,andtheoptimizationdesignofthestructurecanbecarriedoutonthebasisoftheanalysisresults. 2.FiniteElementAnalysisofVehicleBodyStructure Thefiniteelementmodelofthevehiclebodystructureisestablishedbasedontheactualstructureofthevehicle.Themodelincludesthebodyframe,suspensionsystem,engineandothercomponents.Thevibrationandnoisecharacteristicsofthestructureareanalyzedbyusingthefiniteelementmethod,andthevibrationandnoiseresponseofeachnodeofthestructureisobtained.Thevibrationandnoisecharacteristicsofthestructureareanalyzedunderdifferentworkingconditions,suchasacceleration,braking,andunevenroads. Theanalysisresultsshowthatthevibrationandnoiseofthevehiclebodystructurearemainlyconcentratedinthelowfrequencyrange.Thevibrationandnoiseoftheengineandsuspensionsystemarethemainsourcesofthevibrationandnoiseofthevehiclebodystructure.Thevibrationandnoiseoftheenginear