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1、ANSYS/LS-DYNA中阻尼的设置ANSYS/LS-DYNA中阻尼的设置总结如下：EDDAMP,PART,LCID,VALDMP(用此命令流来定义阻尼)Definesmassweighted(Alpha)orstiffnessweighted(Beta)dampingforanexplicitdynamicsmodel.（默认有质量阻尼与刚度阻尼两种）图1LS-DYNA中的阻尼选项PARTPARTnumber[EDPART]identifyingthegroupofelementstowhichdampingshouldbeapp
2、lied.IfPART=ALL(default),dampingisappliedtotheentiremodel.（定义施加阻尼的Part号，如果Part=ALL(orblank)，整体质量阻尼将被应用于整个模型。）LCIDLoadcurveID(previouslydefinedwiththeEDCURVEcommand)identifyingthedampingcoefficientversustimecurve.Iftime-dependentdampingisdefined,anLCIDisrequired.（用来指定相对于
3、时间的质量阻尼）VALDMPConstantsystemdampingcoefficientorascalefactorappliedtothecurvedefiningdampingcoefficientversustime.（可以用来代替对时间的质量阻尼曲线，或者使用LCID命令中的比例系数）注意：Mass-weighted(Alpha)orstiffness-weighted(Beta)dampingcanbedefinedwiththeEDDAMPcommand.Generally,stiffnessproportionalo
4、rbetadampingiseffectiveforoscillatorymotionathighfrequencies.Thistypeofdampingisorthogonaltorigidbodymotionandsowillnotdampoutrigidbodymotion.Ontheotherhand,massproportionaloralphadampingismoreeffectiveforlowfrequenciesandwilldampoutrigidbodymotion.Thedifferentpossibili
5、tiesaredescribedbelow:1.GlobalDampingMass-weightedorAlphadamping（质量阻尼）WhenPART=(blank)orALL(default),mass-weightedglobaldampingcanbedefinedinthefollowing2ways.Inthiscase,thesamedampingisappliedfortheentirestructure.1.Whenthedampingcoefficientversustimecurve(LCID)isspeci
6、fiedusingtheEDCURVEcommand,VALDMPisignoredbyLS-DYNA(althoughitiswrittenintheLS-DYNAinputfileJobname.K).Thedampingforceappliedtoeachnodeinthemodelisgivenbyfd=d(t)mv,whered(t)isthedampingcoefficientasafunctionoftimedefinedbytheEDCURVEcommand,misthemass,andvisthevelocity.2
7、.WhentheLCIDis0orblank(default),aconstantmass-weightedsystemdampingcoefficientcanbespecifiedusingVALDMP.Theconstantandtime-dependentdamping,describedabove,cannotbedefinedsimultaneously.Thelastdefinedglobaldampingwilloverwriteanypreviouslydefinedglobaldamping.2.Dampingde
8、finedforaPART（1）Mass-weightedorAlphadamping（质量阻尼）WhenbothavalidPARTnumberisspecifiedandthedampingcoefficientve
