不同网格划分对机体有限元模态分析结果的影响

不同网格划分对机体有限元模态分析结果的影响*11211(1-2501012-):,,,::TK422:A:1671-0630(2009)05-0069-03DifferentGriddingInfluenceonFiniteElementModalAnalysisResultsofBlockZhangKunjin1,ZhengZhongcai1,GaoYan2,LiJian1,ChenHaiou11-ShandongJianzhuUniversity(Jinan,Shandong,250101,China)2-ShandongCollegeofElectronicTechnologyAbstract:FiniteelementmodalanalysiswasconductedondieselengineblockusingFEAfordifferentnumberofgridding.Bycontrastanalysis,thispaperfoundtheinfluencesofdifferentprecisionanddifferentgriddingonmodalanalysisresultsofblock.Theanalysisresultssuppliedatheoreticalbasisforothersimilarstructuremodalanalysis.Keywords:Dieselengineblock,Finiteelemen,tModalanalysis,Gridding1,[1],,,[2],,[3],:[M]{X&+[C]{X#}+[K]{X}={F(t)}(1):[M][C][K];{X&}{X#},{X};{F(t)}{X}={x1,x2,,,xn}T{F(t)}={f1,f2,,,fn}T,:[M]{X&}+[K]{X}={0}(2):{X}={U}sin(Xt+H)(3)sin(Xt+H),:385200910SMALLINTERNALCOMBUSTIONENGINEANDMOTORCYCLEVo.l38No.5Oc.t2009*:(Y2006F33):(1983-),,,([K]-X2[M]){}={0}(4)nXii(i=1,2,3...,n),{},(4),,:|[K]-X2[M]|=0(5)[K][M]n,n,(5)X2n,nXi(i=1,2,3...,n),Xi,(4)n{}i=[i1,i2,,,in]T,,,,,,(5)2,,,[4],,,113,,[5],,,,,,,,,,67,,123,216737570422973822155513195226637570444144322155526213737722973829973713195217695124[6],QR,HT250,E=1.55@105MPa,L=0.27,,,456,3703846764.971346.51436.31578.97769.071351.91441.91583.0/(%)0.540.400.390.2656375704764.881346.41436.41578.9441443764.971346.51436.31578.9/(%)0.00650.00740.0069067229738769.071351.91441.91583.0299737769.071351.91441.91583.0/(%)00003,467,,;56,6,,73,67;,;,,,,,,,,5:1),,2),,3),,1,,.[J].,2004(4):42~442,,,.ansys[J].,2008(11):72~733,,,.ANSYS[M].:,20064,,.7YPJ[J].,2007,22(5):434~4375,.ANSYS[M].:,20046.ANSYS[M].:,2005(:2009-01-07)715: