資源描述：
《城市軌道客車車內(nèi)噪聲預(yù)測(cè)控制與優(yōu)化技術(shù)研究》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、上海交通大學(xué)碩士學(xué)位論文城市軌道客車車內(nèi)噪聲預(yù)測(cè)控制與優(yōu)化技術(shù)研究姓名：戚方好申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：機(jī)械設(shè)計(jì)及理論指導(dǎo)教師：蔣偉康20070301上海交通大學(xué)碩士論文摘要場(chǎng)的基礎(chǔ)上，計(jì)算車身壁板對(duì)車內(nèi)參考點(diǎn)的聲學(xué)貢獻(xiàn)，并給出了主要噪聲頻率處的各板件的貢獻(xiàn)度系數(shù)，為識(shí)別主要結(jié)構(gòu)噪聲源，改進(jìn)車身結(jié)構(gòu)提供了指導(dǎo)性意見。最后用有限元法對(duì)車內(nèi)聲學(xué)－結(jié)構(gòu)耦合系統(tǒng)進(jìn)行靈敏度和優(yōu)化研究，以車身壁板厚度為設(shè)計(jì)變量，不改變車廂重量，使車內(nèi)參考點(diǎn)聲壓幅值最小的優(yōu)化模型，用Nastran中的聲學(xué)優(yōu)化模塊獲得了基于車內(nèi)噪聲
2、控制的車身優(yōu)化設(shè)計(jì)結(jié)果。關(guān)鍵詞：車內(nèi)噪聲，軌道客車，噪聲預(yù)測(cè)，聲學(xué)優(yōu)化II上海交通大學(xué)碩士論文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上海交通大學(xué)碩士論文ABSTRACTofit.Then,theinfluenceofsoundabsorptionmaterialsfixedontheboundaryofrailwaycarriagewasdiscussed,whichprovedthiskindofmaterialscanreducetheradiated
8、noiseatfieldpointswhilenoisedistributionwasn'tinfluencedbythem.Thefieldpressureofvehiclewascalculatedusedboundaryelementmethod,basedwhichtheacousticcontributionofvehiclebodypanelwascalculated.Herebythemaincontributioncoefficientvehicleb
