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1、ansys旋转对称结构模态分析实例I.BasicSteps1.CreateabasicsectormodeloftheloopstructureThebasicsectormustbeinthecircumferentialdirectiontomatchthelowangleside(1ow)andhigh(high),referstothesideview,thecorrespondingnodeonthetwoside,thegeometricangleandthecorrespondingno
2、deisseparatedbyasectorangle.Thesidecanbeanyshape,nottheplaneinthecolumncoordinatespace2.Definethenodesonthesideofthe1owestangleascomponentsSelectthenodesonthelowestanglesideandclefinethemasacomponent,andthenodesontheothersidecanalsobedefinedasacomponent
3、,whichcanalsobeundefined.ThecomponentcommandsareCM,LOW,andNODE・IfthecomponentHIGHisnotdefined,thenodesonthetwosidesmustcorrespond;otherwise,thecomponentHIGHmustbedefined・3.Selectallthepixelsandsetthecolumncoordinatesystem4.runmacroCYCGENThemacroCYCGENcr
4、eatessecondsectorsandaccumulatesontheunderlyingsector・Thenumberofnodesinthesetwosectorsisdifferent,butthereisaconstantoffset(definedautomaticallyinthemacro)・Bothofthemwillbeusedformodalanalysis・IfyouexecutemacrocYcGENwithoutarguments,youneedtoproceedwit
5、hthefollowingfifthsteps;SuchastheimplementationofCYCGEN,'load，,youwillputthestoveandthebasicconstraintequationinthesectorarecopiedtothenewgenerationsector,thenskipthefifthstep,continuefromstepsixth.5,continuetodefinetherequiredboundaryconditionsinPREP7T
6、heboundaryconditionmustbedefinedonalltwosectors・Ifthereisnoneckstress,thereisnoneedtoapplysymmetricboundaryconditions6,Enterthesolver,specifythetypeofanalysisformodalanalysis,andsettheanalysisoptions・Themodalanalysismodalnumberofthecyclicsymmetricstruct
7、urecanonlybeusedinspacemethodorblockLanczosmethod・CoimnandANTYPEandMODOPTareusedtocompletethedefinitions・7,runmacroCYCSOLanddefinethepitch,range,andsectorCommands:CYCSOL,NDMIN,NDMAX,NSECTOR,LOW,[HIGH],TOL,KMOVE,KPAIRS,SYSNUMInthemodalanalysisofcyclicsym
8、metricstructures,itisnecessarytounderstandtheconceptof"pitchdiameter〃・"Pitchdiameter"comesfromsimplegeometry,suchastheperformanceofadiskvibrationinacertainorderofmodes・Inmostofitsvibrationmodes,thediameteroftheplateiszeroacrossth
