Adams_solver

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1、1AboutAdams/SolverAboutAdams/Solver2Adams/SolverConventionsThroughoutthehelp,thefollowingtypestylesareusedasvisualcues.Style:Indicates:NameAstringthatisalegalnameforuseininterfaceproducts.Thefollowingcriteriamustbemetinorderforalegalstringtobedefined:•Thenamemayonlycontainalphanumericcharacters

2、(upperandlowercase).•Nowhitespaceinthename.•Nospecialcharactersinthename(e.g.@#$%^&*).Theexceptiontothisruleistheunderscore'_'character.•Namesmustbeginwithanalphacharacteroranunderscore.(e.g.4barisnotlegal,while_4barislegal).xArgumentsinAdamssubroutinesandfunctionsiParametersthatfollowastatemen

3、t,command,orargument:i=Integerr=Realc=Characterstring(alphanumeric)e=Functionexpressionv=Varyingtype(integer,real,oralphanumeric)id=Identifierx,y,z=Cartesiancoordinate(real)a,b,c=Angularcoordinate(real)PARTMinimumabbreviationsofstatements,commands,andarguments{}Selectionyoucanmakefromaseriesofi

4、tems[]Optionalselectionyoucanmakefromaseriesofitems[[]]CombinedselectionyoucanmakefromaseriesofitemsATwo-dimensionalmatricesaOne-dimensionalmatricesRVectors1xˆUnitvectors3AboutAdams/SolverBestPracticesThissectioncontainsgeneraltipsonadvancedmodelingwithAdams/Solver.•Discontinuities•Units•DummyP

5、arts•Joints•Motions•Forces•Contacts•Subroutines•Simulation/Integrators•Debugging•MiscellaneousTipsDiscontinuities•Discontinuitiesaretherootcauseofmostsimulationproblems.Avoidthem.•Examplesofdiscontinuousfunctions:MIN,MAX,DIM,MOD,IF.•Discontinuousdisplacementsandvelocitiescausecorrectorandintegr

6、atorfailures.•Discontinuousaccelerationscauseintegrationfailures(requiresinfiniteforce).•Discontinuousforcescausecorrectorfailures.Units•Widelyseparatedmagnitudesinamatrixcancausenumericdifficulties(conditioningproblems).•Becarefulwhenusinginconsistentunits.•Chooseunitssothatmodelstates(displac

7、ementsandvelocities)arereasonablevalues.Forexample,choosing"mm"fordisplacementsofarocketwhichtravelsthousandsofkilometersisapoorchoice.•Chooseunitssothatstiffnessvaluesarenotverylarge.•Choosetimeunitsappropriatetothephenomenabeing