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1、Thebodyofafloormodelformodalanalysis1ForewordInthethreemajorautoassembly,autobodyrepresentingthelevelofvehicledevelopment,developmentofthecarinthedominantpositionofpossession.Asthetrafficprocess,thebodystructurewillbeinavarietyofincentivesvibrationsourceundervibration,iftheseincentiv
2、esfrequencyvibrationsourceclosetothebodyasawholeorinpart,thenaturalfrequency,itwillhappenresonancephenomenon,aviolentvibrationandnoise,Andevencausedstructuraldamage.Therefore,inordertoimprovevehiclesafety,stabilityandcomfort,itisnecessarytothebodystructureofthenaturalfrequencyanalysi
3、s,anditsstructurecanbedesignedtoavoidthevariousvibrationsourceofencouragement.Thepaperwasusededtothefiniteelementanalysismethods,thebodyofafloormodelformodalanalysis,analysisofitsnaturalfrequencyandvibrationmode,toprovidereferenceforactualproduction.2Theestablishmentofthefloorbodyfin
4、iteelementmodelBodyfloorisatypicalconvexslotboardstructure,anditssimulationmodelingTherearetwoways,firstbythetruetroughconvexshapemodelingandtheotherisinaccordancewiththemethodmentionedintheliterature,thatisusedintheslotandconvexStrengthenthebeamtosimulatetheplatestructure,strengthen
5、cross-sectionofthebeamparametersandtheactualstructureinlinewiththetextoftheoriginalmodelusingthefirstmethod.2.1Modeling2.1.1PlaneissueandthinbendingBodyflooroftheCADmodelisthecreationoftheCatiasoftwarecompleted.Bodypartsarethemostpiecesofsheetmetal,sheetmetalthicknesshplaneismuchsmal
6、lerthanitssize.Theloadplatedeformationandtheroleoftheway,whentheloadinparalleltothesurface(theequallyflatplatethickness)andthethicknessalongthesamedirection,thatistheplanestressproblemsiftheloadperpendiculartothesurface,itwillcausethecurvedsheetDeformation.Totheplateinthefaceforthex-
7、yplane,perpendiculartothesurfaceintheshaftforthezaxis.Intheplanestressproblem,onlyparalleltothex-yplaneofthethreestresscomponentsas:Thesethreecomponentsalongthesamethicknessh,whichisafunctionofxandy,andzcoordinatesnothingtodo,andtheremainingamountiszero.Planestressofthephysicalequati
8、onas:Platebe
