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1、AbstractAbstractThistopiccomesfromaschool-enterprisecooperationprojectdevelopinganewtypeofmarinelowspeedtwo-strokedieselengine,whichprimarilyresponsibleforengineblockstructuralstrengthandfatigueanalysistoguidethedesign.Duringtheprojectprocess,loadcasesselection,keysimulationtechn
2、ology,structuralstrengthandfatigueofengineblockwerecarriedoutinthispaper.Atlastfatigueinfluencefactorsfartheranalysiswerestudied.Thefeasiblemeasurestoimprovethefatiguesafetyfactorwereproposedinaddition.Inthispaperthemaincontentsandconclusionsareasfollows:（1）Basedonthestructuralfe
3、atureofMarinelowspeeddieselengine,theblockcompositionandthespecificfunctionofcomponentswerelearned.Theforceanalysisandoperationconditionsselectionofblockgroupswerefinished.（2）Somekeysimulationtechnologyofstructuralanalysissuchasthesimulationofbearingforceandthesimplifysimulationo
4、fboltconnectionwereverifiedbyexamination.Atthesametime,methodsandmeasuresofimprovingtheconvergenceofcomplexmodelwereresearched,whichmadethesubsequentanalysismorepersuasive.Accordingtotheanalysissteps,themainforcedatasuchasmainbearingforce,explosionpressureandcrossheadsideforcewer
5、eachievedinVirtualEngine.（3）Thesolidmodelsimplificationandsimulationobjectmodelextractwerefinished,establishingacorrectandsimplegridmodel.Thecorrespondingconstraints,boundaryandloadofengineblockwerecompleted,andtheFEmodelwasbuilt.（4）Structuralstrengthanalysisofengineblockincludin
6、gframebox,bedplateandstayboltswerecarriedoutanddiscussed,bywhichtheweakareaofstructurewasfound.Thedetailedanalysisofassemblystrength,thermalexpansioncharacteristic,framestrengthandstiffnessunderlimitcrosslateralforceandstrengthoftheframeundertheultimatebearingstresswerestudied.At
7、lastboltstructurestrengthrespectivelyfromtheVDIstandardandfiniteelementanalysistwoaspectswerecheckedthroughandcontrasted.（5）thefatigueofengineblockwasanalyzed,basedonthepreviousstructuralstrengthanalysis,whichfoundtheweakfatigueareas.FatiguesafetycoefficientsofIIIframe,bedplatean
8、dstayboltwerechecked.Inviewofthefatiguei
