驾驶室结构和声学特性-分析与优化

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1、英文摘要ABSTRACTInthispaper,thedynamicandacousticcharacteristicsofaheavycommercialvehiclecabwereresearchedbythemethodofFEM．Themodalcharacteristicsofthecab’Sbody—in—white(BIW)wereoptimizedandimprovedusingstructureoptimizationmethod．Thetopologyoptimizationpr

2、ogramforfreedampingmaterialwaswritten．Withthisprogram，thearrangementofthedampingmaterialonthecabwasoptimized．Sothepeakpressureatthereferencepointwasefficientlyreduced．Theresearchonastructure—acousticcouplingmodel，consistingofaluminumplateandtheacoustic

3、cavitNwasconducted．Theresultofthesimulationandexperimentallvalidatedthevalidityofthetopologyoptimizationprogram．ThefiniteelementmodelofcabwassetupbyHypermesh，andits10Wmodalanalysiswasconducted．Theanalysisresultshowedthatthefirstmodalfrequencyofthecabwa

4、slOW．Forraisingthefirsttorsionfrequencyofthecab，topologyoptimizationwasappliedtooptimizethestructureofthecab．Threeimprovingmethodswereputforwardonthebasisoftheoptimizationresult，likemodilyingtheoriginalreinforcedboards，addingnewreinforcedboardsandaddin

5、gstrengthenribs．Throughanalysisandcomparison，addingnewreinforcedboardswaschosenforthestructureimprovementscheme．Thenthethicknessofthenewreinforcedboardswasoptimized．Accordingtothecomparisonbetweentheoptimizedcabandtheoriginalone，it‘Sfoundthatthefirstto

6、rsionfrequencyofthecabenhancedfrom17．952Hzto22．200Hz，andbendingstiffnessandtorsionrigiditywasgreatlyimproved．Thestructure—acousticcouplingfiniteelementmodelofcabwasestablished．Modalcharacteristicsandacousticresponseofthemodelwereanalyzed．Theacousticstr

7、ucturalmodalparticipationfactorsandpanelacousticcontributionsforpeaksoundpressureatthereferencepointwerecomputedtofindstructuralmodalsandpanelsthathadmostinfluenceontheacousticresponseofvehicle．Thefrontpanelwastreatedwithdampingmaterialtoreducethepeakp

8、ressureatthereferencepoint．Inordertofindtheoptimumdistributionofdampingmaterialandreduceitsconsumption，thetopologyoptimizationprogrambasedonoptimizationcriteriaalgorithmwaswrittenusingDMAPlanguage．Withthisprogram，thearrangementofthedamp