adams振动分析实例

OverviewADAMS/Vibration,partoftheMSC.ADAMS®suiteofsoftware,performsfrequency-domainanalyses.ADAMS/VibrationisaplugintotheinterfaceproductsADAMS/Aircraft,ADAMS/Car,ADAMS/Engine,ADAMS/Rail,andADAMS/View.ItcanalsobeusedstandalonewithanADAMS/Solvermodel.UsingADAMS/Vibration,youcanstudyforcedvibrationswithinyourMSC.ADAMSmodels.YoucanalsousetheresultsfromADAMS/Vibrationinnoise/vibration/harshness(NVH)studiestopredicttheimpactofvibrationsinautomobiles,trains,planes,andsoon.ADAMS/Vibrationcanrunintwomodes:interactiveandbatch.ThisguidefocusesonusingADAMS/VibrationinourMSC.ADAMSinterfaceproducts,suchasADAMS/View(interactivemode).Forinformationonbatchmodeanalysis,refertotheADAMS/Vibrationonlinehelp.Thisguideincludesthefollowingsections:■IntroducingtheProblem,3■BuildingtheModel,9■TestingtheModel,19■ReviewingtheModel,23■ImprovingYourDesign,39■OptimizingtheModel,45GettingStartedUsingADAMS/VibrationGettingStartedUsingADAMS/VibrationCopyright2Theinformationinthisdocumentisfurnishedforinformationaluseonly,mayberevisedfromtimetotime,andshouldnotbeconstruedasacommitmentbyMSC.SoftwareCorporation.MSC.SoftwareCorporationassumesnoresponsibilityorliabilityforanyerrorsorinaccuraciesthatmayappearinthisdocument.CopyrightInformationThisdocumentcontainsproprietaryandcopyrightedinformation.MSC.SoftwareCorporationpermitslicenseesofMSC.ADAMS®softwareproductstoprintoutorcopythisdocumentorportionsthereofsolelyforinternaluseinconnectionwiththelicensedsoftware.NopartofthisdocumentmaybecopiedforanyotherpurposeordistributedortranslatedintoanyotherlanguagewithoutthepriorwrittenpermissionofMSC.SoftwareCorporation.Copyright©2005MSC.SoftwareCorporation.Allrightsreserved.PrintedintheUnitedStatesofAmerica.TrademarksADAMS,EASY5,MSC,MSC.,MSC.ADAMS,MSC.EASY5,andallproductnamesintheMSC.ADAMSProductLinearetrademarksorregisteredtrademarksofMSC.SoftwareCorporationand/oritssubsidiaries.NASTRANisaregisteredtrademarkoftheNationalAeronauticsSpaceAdministration.MSC.NastranisanenhancedproprietaryversiondevelopedandmaintainedbyMSC.SoftwareCorporation.Allothertrademarksarethepropertyoftheirrespectiveowners.GovernmentUseUse,duplication,ordisclosurebytheU.S.GovernmentissubjecttorestrictionsassetforthinFAR12.212(CommercialComputerSoftware)andDFARS227.7202(CommercialComputerSoftwareandCommercialComputerSoftwareDocumentation),asapplicable.1IntroducingtheProblemOverviewThistutorialteachesyouhowtouseADAMS/VibrationinADAMS/ViewtoperformavibrationanalysisonanMSC.ADAMSmodel.Inthistutorial,youwillinvestigatetheoperationofasatellitebeforethedeploymentofthesolarpanelsandtheseparationofthesatellitefromthelaunchvehicle.Youwillinvestigatethelaunchvibrationenvironmentanditseffectonthevariouscomponentsofthesatellite.Thischapterprovidesdetailsaboutthemodelyouwilluse,andtheproblemyouwilladdress.Itincludesthefollowingsections:■WhatYou’llSolve,4■WhatYouWillLearn,5■WhatYouWillCreate,7Thistutorialtakesabouttwohourstocomplete.GettingStartedUsingADAMS/VibrationIntroducingtheProblem4AboutThisTutorialWeassumethatyouwillworkthroughthistutorialinsequentialorder.Therefore,wegiveyoumoreguidanceinthebeginningandlessasyouproceedthroughthetutorial.Ifyouchoosenottoworkthroughthetutorialinsequentialorder,youmayhavetoreferencethebeginningchaptersforsomeofthebasicconcepts.Wealsoassumethefollowing:■YouknowhowtoruntheMSC.ADAMSproducttowhichADAMS/Vibrationplugsin(forexample,youknowhowtorunADAMS/View).■YouknowhowtouseADAMS/PostProcessortoviewtheresultsoftheanalyses.■ADAMS/Vibrationisinstalledonyourcomputerornetwork,andthatyourpathvariablecontainsthelocationwhereADAMS/VibrationisinstalledandthatyouhavepermissiontoexecuteADAMS/Vibration.IfyoudonotknowifADAMS/Vibrationisinstalledorwhereitislocated,seeyourlocalADAMS/Vibrationexpertorsystemadministrator.WhatYou’llSolveDuringlaunch,launchvehiclesimparthighloadsintosensitivespacecraftcomponents.Eachspacecraftcomponentandsubsystemmustbedesignedtowithstandtheselaunchloads.Tomakecomponentsstrongenoughtowithstandtheseloadsrequiresadditionalweight,whichincreasescostsandreducesoverallperformance.Abetteroptionistoreducethemagnitudeofthevibrationsintothesensitivecomponentsbycarefullydesigningthestructureofthelaunchvehicleadapter.Inthistutorial,youwillsolvetheproblemofdesigninganisolationmountofthelaunchvehicleadaptersuchthatthelaunchvibrationsintosensitivecomponentsareminimizedoveradefinedfrequencyrange.Thesensitivecomponentsyouareconcernedwitharelocatedonthesolarpanels.Theyaresensitivetoinputswithinthefrequencyrangeof70Hzto100Hz,especiallyinadirectionnormaltothepanels.GettingStartedUsingADAMS/VibrationIntroducingtheProblem5Threeequally-spacedbushingsconnectthelaunchvehicleadaptertothelaunchvehicle.Thestiffnessanddampingcharacteristicsofthesebushingsaffectthetransmittedvibrationloadswithinthe70to100Hzfrequencyrange.Therefore,thedesignproblemisstatedas:Findtheidealvaluesofstiffnessanddampingforthelaunchvehicleadaptersystemsuchthat:■Theverticalaccelerationintothespacecraftisnotamplified.■Thetransmittedlateralaccelerationinthe70to100Hzfrequencyrangeisminimized.Youmustchooset