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1、循环对称结构的模态分析简介（Modalanalysisofcyclicsymmetricalstructures）SymmetryloadsymmetryofaxisymmetricstructureModalanalysisofcyclicsymmetricstructuresismainlyusedinmodalanalysisofcircularsymmetricstructuressuchasgears,turbines,impellers,etc..Itextendsthewholemodelbyanalyzingasectorofthestructur
2、ebyanalyzingthesector.Thereare6stepsinit.1,establishthebasicsectormodel,thatis,themodelthatonlybuilds1/n,atoothandablade.2,determinethecyclicsymmetryplane(whichcanbedeterminedautomaticallyormanually).3,imposeboundaryconditions.4,formulateanalysistypesandanalysisoptions.5,specifytheloo
3、psolutionoptionthroughthecycopcommand,andusesolvetosolve.6,thevibrationmodeisextendedtoall360degreerangeby/cyexpand,andthewholeresultisobserved.Duetothechoiceofharmonicindex,thenaturalfrequencywillbemessyinthearrangement.ThepreviousversionofANSYScalledtheharmonicindexcallednodaldiamet
4、er,andnowiscalledharmonicindex.Accordingtotheoverallstructureanalysis,thesystemwillbeinaccordancewiththefrequencyfromsmalltolarge.Withtheharmonicindexcalculatedinfrequency,hearrangedtimeisarrangedinaccordancewiththeincreaseofharmonicindex,therefore,thenaturalfrequencycorrespondingtoth
5、ebigandsmall,irregular(butthesamearrangementisnumerical,different).Thesolutionis,youcanextracttheresult,andyoucanarrangeitfromsmalltolarge.Inaddition,therearesomepointsforattentioninsolvingthisprocess.Aintheestablishmentofthebasicsector,inthecylindricalcoordinatesystem,yousetthecsys1c
6、anbe,Badditionally,sectorangleselectioncanbedivisibleby360.Cselectsthenodeswhenchoosingthecyclicsymmetrysurface,asifotherfeaturesarenotavailable.ACismoreimportant,Bjustalittleattention.Andthenthere'sthesolutionThecalculationofvibrationmodesbyaxisymmetricelementsisnotavailableforallaxi
7、symmetricelements,andcanbereferencedinthefollowingcontentsofANSYShelp:AxisymmetricElementswithNonaxisymmetricLoads-explainswhichaxisymmetricelementscanbesubjectedtononaxisymmetricanalysisandhowtoproceed;Modecommand-definesthenumberofaxialharmonicswhenaxisymmetricelementsareusedfornona
8、xisym
