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时间:2020-05-11
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1、AboutAdjustingYourModelBeforeSimulationBeforeyoubeginyoursimulation,youmaywanttodooneormorepreliminaryoperationstohelpensureabettersimulation.Youcandoanyofthefollowing:•Checktoseeifyouhavetheexpectednumberofmovablepartsandtheexpectednumberandtypeofconstraintsinyourmodel.•Dete
2、rminethetotalnumberofsystemdegreesoffreedom(DOF)andwhich,ifany,constraintequationsareredundant.Learnmore.•Checktoseeifanyconstraintsarebrokenorincorrectlydefinedand,ifso,performaninitialconditionssimulationonyourmodeltotrytocorrectthesebrokenjoints.Learnmore.•Performastaticsi
3、mulationtomoveyourmodelintoanequilibriumconfigurationimmediatelybeforeperformingadynamicsimulationtoreducesomeoftheinitial,transientsystemresponse.•Calculatethenaturalfrequenciesofyourmodelaslinearizedaboutaparticularoperatingconfiguration.LearnmorePerformingInitialConditions
4、SimulationYoucanperformaninitialconditionssimulationtocheckforanyinconsistenciesinyourmodel.Theinitialconditionssimulationisoftenreferredtoasanassemblemodeloperation.Aninitialconditionssimulationtriestoreconcileanypositioninginconsistenciesthatexistinyourmodelatitsdesignconfi
5、gurationandmakeitsuitableforperforminganonlinearorlinearsimulation.Mostimportantly,theinitialconditionssimulationtriestoensurethatalljointconnectionsaredefinedproperly.Forexample,forarevolutejointtobedefinedproperly,theoriginsofthemarkersthatdefinethejointmustbecoincidentthro
6、ughoutasimulation.Ifthemarkersarenotcoincident,thejointisbrokenandneedstoberepaired.Inthisexample,theinitialconditionssimulationhelpsrepairthebrokenrevolutejointbymovingtheoriginsofthetwomarkersuntiltheyarecoincident,asshowninthefollowingfigure.ConsistentGearsthatBecomeIncons
7、istentInthecaseofthedoorwithtwohinges,Adams/Solverignoresfiveoftheconstraintequationsthatitfindsredundant.YoudonotknowwhichequationsAdams/Solverignores,however.IfAdams/Solverignoresalloftheequationscorrespondingtooneofthehinges,thenallthereactionforcesareconcentratedattheothe
8、rhingeintheAdams/Solversolution.Adams/Solverarbitrarilysetsthereacti
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