城市轨道客车车内噪声预测控制与优化技术研究

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1、上海交通大学硕士学位论文城市轨道客车车内噪声预测控制与优化技术研究姓名：戚方好申请学位级别：硕士专业：机械设计及理论指导教师：蒋伟康20070301上海交通大学硕士论文摘要场的基础上，计算车身壁板对车内参考点的声学贡献，并给出了主要噪声频率处的各板件的贡献度系数，为识别主要结构噪声源，改进车身结构提供了指导性意见。最后用有限元法对车内声学－结构耦合系统进行灵敏度和优化研究，以车身壁板厚度为设计变量，不改变车厢重量，使车内参考点声压幅值最小的优化模型，用Nastran中的声学优化模块获得了基于车内噪声

2、控制的车身优化设计结果。关键词：车内噪声，轨道客车，噪声预测，声学优化II上海交通大学硕士论文ABSTRACTResearchforpredictionandcontrol&optimizationofinteriornoiseinurbanrailwayvehicleABSTRACTFiniteelementmethodandboundaryelementmethodhavebeenusedtopredictandcontrolthenoiseinsidetherailwayvehicleatlo

3、wandintermediatefrequency.Herebytheresultsinthisessaycanbereferredforfurtherstudyonhowtocontrolthenoiseradiation.Themainworkofthisessayareasfollows:Firstly,themodelofthecomplicatedstructureofrailwayvehiclehasbeensimplified,thereafterthefiniteelementmod

4、elofthestructurebodyandthedynamicaircavityofrailwayvehiclewasestablished,thenthedynamiccharacteristicandthecavitymodeofrailwayvehiclebodywasanalyzed.Secondly,accordingtotrackspectrum,thedynamicforcespectrumoffoursupportivepointsloadedbyrailwayvehiclebo

5、giewasanalyzed,whichwasusedasexcitationandcombinedwithfiniteelementmethodandboundaryelementmethod,thevibrationresponseofcarriageandradiationnoiseofvehiclepanelexcitedbyexternalforce.Noisedistributionofdifferentareafrom30to200Hzwasdisplayed.Synchronousl

6、y,A-weightedtotalsoundpressurelevelofreferencepointsinthevehiclewerecalculatedandsoundpressuredistributionoftheplanefieldpointswerevisuallydisplayedaswell.Theacousticfielddistributionoftheinteriorvehiclewasanalyzed,whoseresultsshowedthatthefieldpressur

7、edistributedalongthesymmetrylineofvehicle'slongitudedirectionwashigherthantheeachsideIII上海交通大学硕士论文ABSTRACTofit.Then,theinfluenceofsoundabsorptionmaterialsfixedontheboundaryofrailwaycarriagewasdiscussed,whichprovedthiskindofmaterialscanreducetheradiated

8、noiseatfieldpointswhilenoisedistributionwasn'tinfluencedbythem.Thefieldpressureofvehiclewascalculatedusedboundaryelementmethod,basedwhichtheacousticcontributionofvehiclebodypanelwascalculated.Herebythemaincontributioncoefficientvehicleb