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ID:33959382
大小:6.59 MB
页数:63页
时间:2019-03-02
《车内辐射声场声学参数cae计算与声振耦合分析》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、车内辐射声场声学参数CAE计算与声振耦合分析摘要本文运用有限元、边界元法对车内低频结构噪声进行了预测研究,试图探索出一种车内噪声预测分析方法,为汽车降噪提供设计思路。首先建立车内声腔声学有限元模型、声一振耦合有限元模型,然后综合利用有限元法对该车内声腔声学模态进行了研究。对比了有、无座椅的车内声腔模型的声学模态,结果表明装入座椅后各阶共振频率均降低,模态振型发生变化。同时也分析了发动机竖向激振频率响应,结果表明在发动机的四阶激励频率为50Hz左右时,此时后地板和前顶棚处于响应峰值,建议将顶棚进行优化以提高其刚度。在此基础上,利用边界元法对车内结构辐射声场特性进行了分析,并提
2、取了驾驶员、副驾驶和后排乘客右耳处的声压曲线。得出了在激励频率50Hz左右时车内低频辐射噪声将加剧,后排乘坐环境比较恶劣。进一步对车身板件振动声学贡献分析结果表明:前底板、前挡风玻璃、前围板、前车门和整个顶棚与驾驶员右耳处引起的噪声有较强的相关性,是该车的主要声学贡献来源。最后对如何改进车内噪声问题提出了一些看法。关键词:车内噪声,有限元,边界元,声模态,谐响应,结构辐射声场,声学贡献CAEAnalysisandStructure—acousticCouplingAnalysisofAcousticParametersofCarInteriorRadicalSoundFie
3、ldABSTRACTThisdissertationpredictsthelow.frequencyinteriorstructuralnoiseofacarbyusingFEM&BEM,triestoquestforamethodofpredictingcarinteriornoise,whichcanprovideideasfornoisecontr01.First,theacousticfiniteelementmodelofcompartmentcavityandthestructural-acousticcouplingfiniteelementmodelaree
4、stablished,thenthemodesofacousticcavitywereanalyzedbyusingFEM.Comparisonofmodesbetweencavitieswithandwithoutseatswasmade,theresultsshowthatthemodesofcavitywithseatsdecreaseandthevibrationtypealsodiffers.Atthesametimethefrequencyresponsesofengineverticalexcitationareanalyzed,theresultsshowt
5、hatthefloorandroofofthecarresonancesat50Hz.Suggestionsofstructuraloptimizationaremadetoimprovestiffness.Basedonwhathavedone。thecharacteristicsofcarradicalsoundfieldarefinalyzedbyusingBEM,andthesoundpressurelevelcurvesofthemeasuringpointsofnearrightearofthedriver,thevice-driverandrearsearpa
6、ssengersaredrew.Theconclusionsarethattheinnerradicalnoisepeakswhenstimulationreaches50Hz,therearcompartmentsoundenvironmentiStoobad.Furtherpanelacousticcontributionanalysisshowsthatthenoiseradiatedfromthefrontfloor,thefrontwindshieldglass,thefirewall,thefrontdoorsandtheroofhavetoomuchcorre
7、lationwiththenoiseofnearrightearofthedriver.Thoseareconsideredthemainnoiseresourcesofthecar.Atlastsomeopinionsofhowtoimproveinnernoiseareputforward.Keywords:carinteriornoise,FEM,BEM,acousticmode,frequeneyresponse,structuralradicalsoundfield,acousticcontributio
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