Ansysworkbench_Modal_安世亚太培训.pdf

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1、CustomerTrainingMaterialLecture6VibrationAnalysisIntroductiontoANSYSMechanicalANSYS,Inc.ProprietaryRelease13.0©2010ANSYS,Inc.Allrightsreserved.L6-1November2010IntroductiontoANSYSMechanicalChapterOverviewCustomerTrainingMaterial•Inthischapter,performingfreevibrationaswellaspre-stressedvibra

2、tionanalysesinMechanicalwillbecovered.InMechanical,performingafreevibrationanalysisissimilartoalinearstaticanalysis.–ItisassumedthattheuserhasalreadycoveredChapter4LinearStaticStructuralAnalysispriortothissection.•Thefollowingwillbecovered:–FreeVibrationAnalysisProcedure–FreeVibrationwithP

3、re-StressAnalysisProcedure•ThecapabilitiesdescribedinthissectionaregenerallyapplicabletoANSYSDesignSpaceEntralicensesandabove.ANSYS,Inc.ProprietaryRelease13.0©2010ANSYS,Inc.Allrightsreserved.L6-2November2010IntroductiontoANSYSMechanicalBasicsofFreeVibrationAnalysisCustomerTrainingMaterial•

4、Forafreevibrationanalysis,thenaturalcircularfrequenciesωandimodeshapesφarecalculatedfrom:i([]2[]){}K−ωMφ=0ii•Assumptions:–[K]and[M]areconstant:•Linearelasticmaterialbehaviorisassumed•Smalldeflectiontheoryisused,andnononlinearitiesincluded•[C]isnotpresent,sodampingisnotincluded•{F}isnotpres

5、ent,sonoexcitationofthestructureisassumed•Thestructurecanbeconstrainedorunconstrained–Modeshapes{φ}arerelativevalues,notabsoluteANSYS,Inc.ProprietaryRelease13.0©2010ANSYS,Inc.Allrightsreserved.L6-3November2010IntroductiontoANSYSMechanicalA.FreeVibrationAnalysisProcedureCustomerTrainingMate

6、rial•Thefreevibrationanalysisprocedureisverysimilartoperformingalinearstaticanalysis,sonotallstepswillbecoveredindetail.Thestepsinblueitalicsarespecifictofreevibrationanalyses.–AttachGeometry–AssignMaterialProperties–DefineContactRegions(ifapplicable)–DefineMeshControls(optional)–DefineAna

7、lysisType–IncludeSupports(ifapplicable)–RequestModalResults–SetModalOptions–SolvetheModel–ReviewResultsANSYS,Inc.ProprietaryRelease13.0©2010ANSYS,Inc.Allrightsreserved.L6-4November2010IntroductiontoANSYSMechanical…GeometryandPointMassCustomerTrainingMaterial•M