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1、循环对称结构的模态分析简介（Modalanalysisofcyclicsymmetricstructure）AxialsymmetryloadsymmetrysymmetryModalanalysisofcyclicsymmetricstructureismainlyusedinsuchasgear,turbineimpeller,analysiswithcyclicsymmetryobjectmode.Throughasimulationofsectorstructure,throughtheana
2、lysisofthesector,whichisextendedtotheentiremodel.Ithas6mainsteps.1,establishthebasicsectormodel,istheonlymodelbuiltby1/n,agearandablademodel.2,determinethecircularsymmetryplane(canbedeterminedautomatically,youcanalsomanuallyselect).3boundaryconditions.4
3、,analyzetypesandanalysisoptions.5,throughthecycopcommandtospecifytheloopsolutionoptions,andsolvedbysolve.6,themodeisextendedtoall360degreesby/cyexpand,andobservetheresults.Becauseoftheharmonicindexselection,thenaturalfrequencywillhavesomedisorderinarran
4、gement.ThepreviousANSYSversionoftheharmonicindexofthisconceptiscalledthepitchdiameter,nowcalledtheharmonicindex.Accordingtotheanalysisoftheoverallstructure,thesystemwillputthefrequencyaccordingtotheascendingorder.Withtheharmonicindexcalculatedinfrequenc
5、y,hearrangedtimeisarrangedinaccordancewiththeincreaseofharmonicindex,therefore,thenaturalfrequencycorrespondingtothebigandsmall,irregular(butthesamearrangementisnumerical,different).Thesolutionis,youputtheresultsextracted,takeitaccordingtotheascendingor
6、deraboutit.Therearesomeplacesintheprocessofsolvingattention.Aintheestablishmentofbasicsectorsincylindricalcoordinates,youcansetthecsys1,Binaddition,sectoranglecanbedivisibleby360.Ccircularsymmetryplanewhenselectingthenode,likeotherfeatures(noreasonIando
7、therssay,forget).ACisimportant,Blittleattentiontowhatisgood.Thenthesolution.Calculationofvibrationmodalaxisymmetricelement,notallaxisymmetricelementscanbeused,thefollowingcanbereferenceinANSYShelp:AxisymmetricElementswithNonaxisymmetricLoads-andthatwhic
8、hcanbenonaxisymmetricelementandhowtocarryouttheanalysisofaxialsymmetry;TheModecommand-definedbyaxisymmetricelementofnonaxisymmetricaxialharmonicanalysisofthenumberofShell61-fornonaxisymmetricharmonicaxisymmetricshellelementanalys
