毕业设计外文及翻译翻译变速箱噪音

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1、毕业设计外文及翻译翻译--变速箱噪音GearboxNoiseCorrelationwithTransmissionErrorandInfluenceofBearingPreloadDoctoralThesisinMachineDesignTRITA-MMK200819ISSN1400-1179ISRNKTHMMKR-0819-SEDepartmentofMachineDesignRoyalinstituteofTechnologySE10044StockholmSweedenMatskerblom2008ABSTRACTThefive

2、appendedpapersalldealwithgearboxnoiseandvibrationThefirstpaperpresentsareviewofpreviouslypublishedliteratureongearboxnoiseandvibrationThesecondpaperdescribesatestrigthatwasspeciallydesignedandbuiltfornoisetestingofgearsFiniteelementanalysiswasusedtopredictthedynamicprop

3、ertiesofthetestrigandexperimentalmodalanalysisofthegearboxhousingwasusedtoverifythetheoreticalpredictionsofnaturalfrequenciesInthethirdpapertheinfluenceofgearfinishingmethodandgeardeviationsongearboxnoiseisinvestigatedinwhatisprimarilyanexperimentalstudyEleventestgearpa

4、irsweremanufacturedusingthreedifferentfinishingmethodsTransmissionerrorwhichisconsideredtobeanimportantexcitationmechanismforgearnoisewasmeasuredaswellaspredictedThetestrigwasusedtomeasuregearboxnoiseandvibrationforthedifferenttestgearpairsThemeasurednoiseandvibrationle

5、velswerecomparedwiththepredictedandmeasuredtransmissionerrorMostoftheexperimentalresultscanbeinterpretedintermsofmeasuredandpredictedtransmissionerrorHoweveritdoesnotseempossibletoidentifyonesingleparametersuchasmeasuredpeak-to-peaktransmissionerrorthatcanbedirectlyrela

6、tedtomeasurednoiseandvibrationThemeasurementsalsoshowthatdisassemblyandreassemblyofthegearboxwiththesamegearpaircanchangethelevelsofmeasurednoiseandvibrationconsiderablyThisfindingindicatesthatotherfactorsbesidesthegearsaffectgearnoiseInthefourthpapertheinfluenceofbeari

7、ngendplayorpreloadongearboxnoiseandvibrationisinvestigatedVibrationmeasurementswerecarriedoutattorquelevelsof140Nmand400Nmwith015mmand0mmbearingendplayandwith015mmbearingpreloadTheresultsshowthatthebearingendplayandpreloadinfluencethegearboxvibrationsWithpreloadedbearin

8、gsthevibrationsincreaseatspeedsover2000rpmanddecreaseatspeedsbelow2000rpmcomparedwithbearingswithendplayFinite