adams--求解器设置

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1、ADAMS—求解器设置http://bluestar179.blog.163.com/http://blog.sina.com.cn/hill711WARNING:Thecorrectorhasnotconvergedafter1attempts.No.ofiterations=6.ERROR:Thesimulationisterminatingattime=7.53906E-03.Adamscannotsolvetheequationsofmotionbecausethemechanismhas"lockedup."Atleastoneconstraintcannolon

2、gerbesatisfied.Adamsisunabletosatisfytheconstraintfor:JOINTmodel_1.JOINT_3.ERROR:LockupdetectedSolverSetting-EquilibriumAdams/Car2010-04-1620:31:16阅读89评论0字号：大中小针对静平衡求解过程中出现"LockUp"问题的解决方法ErrorSpecifiesthemaximumrelativedisplacementerrorallowedduringstaticsimulations.Thedefaultis1.0E-04andt

3、herangeisError>0定义静平衡求解过程中的位移相对误差；此数值越大求解越容易收敛，自然误差也越大。TlimitSpecifiesthemaximumtranslationalincrementallowedperiterationduringstaticsimulationsperformedusingstaticsimulations.Thedefaultis20andtherangeisTlimit>0定义静平衡求解过程中，每一步迭代的最大位移增量；对于复杂模型，若位移增量过大，受力的突变会导致静平衡求解失败；AlimitSpecifiesthemaximu

4、mangularincrementallowedperiteration.ThedefaultunitsforAlimitareradians.TospecifyAlimitindegrees,addaDafterthevalue.Thedefaultis0.17453(10D)andtherangeisAlimit>0与Tlimit相似，需要注意的地方是默认单位是“弧度”，若需要输入“度”，必须在数值后面加“D”。如需要设置为10度，输入为10DMaxitSpecifiesthemaximumnumberofiterationsallowedforfindingstati

5、cequilibriums.Thedefaultis25andtherangeisMaxit>0.最大迭代步数，应该与Tlimit和Alimit配合设置；假设初始状态与平衡状态的位移相差100mm，而Tlimit设置为1，则Maxit需要设置比100大，设置为200应该差不多了。StabilitySpecifiesthefractionofthemassanddampingmatricesADAMS/Solveraddstothestiffnessmatrix.Addingafractionofthemassanddampingmatricestothestiffnessm

6、atrixcanstabilizetheiterationprocessandpreventtheiterationfromdiverging.Oftenthestiffnessmatrixissingularforasystembecausethesystemisneutrallystable(forexample,thesystemmovesincertaindirectionswithoutaffectingthepotentialenergy).Addingafractionofthemassanddampingmatricestothestiffnessmatri

7、xremovesthissingularityandmakesitpossibletosolveforequilibriumpositions.ThevalueofStabilitydoesnotaffecttheaccuracyofthesolution,butitdoesaffecttherateofconvergenceoftheiterationprocess.Thedefaultis1.0E-05andtherangeisStability0.施加于刚度矩阵的一个“稳定系数”，使迭代过程更加平稳，更容易收