资源描述：
《转子动力学ansys-help》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、8.1.UnderstandingRotatingStructureDynamicsYoucanobserveinertiaeffects,appliedviatheCORIOLIScommand,ineitherastationaryreferenceframeorarotatingreferenceframe.Inbothcases,youspecifyangularvelocitybyissuinganOMEGAorCMOMEGAcommand.Thedynamicequationincorporatingtheeffectofr
2、otationisgivenbywhere[M],[C]and[K]arethestructuralmass,damping,andstiffnessmatrices,respectively.[Kc]isthespinsofteningmatrix(describedinSpinSofteningintheTheoryReferenceforANSYSandANSYSWorkbench.) [G]isa“damping”matrixcontributionduetotherotationofthestructurespecifiedv
3、iatheOMEGAorCMOMEGAcommand(describedinRotatingStructuresintheTheoryReferenceforANSYSandANSYSWorkbench).WithouttheinertiaeffectappliedviatheCORIOLIScommand,ANSYSdoesnotgeneratethe[G]matrix,andtheusualeffectoftheangularrotationvelocityspecifiedbytheOMEGAorCMOMEGAcommandapp
4、lies(asdescribedinAccelerationEffectintheTheoryReferenceforANSYSandANSYSWorkbench).Anexceptionexists,however,involvinganonlineartransientanalysisusingelementsMASS21,BEAM188,andBEAM189;inthiscase,theinertiaeffectduetorotationappliedviaanICcommand(oraDcommandoveranincremen
5、taltime)isincludedwithouthavingtoissueCORIOLISandOMEGAorCMOMEGAcommands8.2.UsingaStationaryReferenceFrameTheprimaryapplicationforastationary(ratherthanarotating)frameofreferenceisinthefieldofrotordynamicswherearotatingstructure(rotor)ismodeledalongwithastationarysupports
6、tructure.Examplesofsuchanapplicationincludeagasturbineenginerotor-statorassemblyoranelectricturbogenerator,wheretherotorspinsinsideaspeciallydesignedhousing.Therotatingpartofthestructuretobemodeledmustbeaxisymmetric.Thegyroscopicdampingmatrixgeneratedisvalidonlyforalinea
7、ranalysis.ANSYScomputesthedisplacementfieldwithrespecttotheglobalcoordinatesystem(CORIOLIS,Option=ON,,,RefFrame=ON),referredtoasthestationaryreferenceframe.ElementsSupportedElementsthatarepartoftherotatingstructuregeneratethegyroscopicmatrixthatarisesduetotherotationalan
8、gularvelocity.Thegyroscopicmatrixisavailableforthefollowingelements:BEAM4,PIPE16,MASS21,SOLID45,SOLID95
