城际高速列车断面优化设计

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1、万方数据ABSTRACTABSTRACTABSTRACT：Multiplegoalsareoftenutilizedinpracticalengineeringdesignoptimizationproblems．Inthispaper,bytakingCRH3XemumiddleCarasobject,Thestrength，stiffnessandfreemodalunderemptyandfullloadstatusareanalyzed．Thenbasedontheresultsoftheanalysis，s

2、everalconditionsarechosenbyconsideringtheperformanceindexes．Finally,thisarticleexplorethebodysectionoptimizationmethodbymeansofapproximationmodel．Thearticlemainlycompletedthefollowingseveralaspects：1．Theestablishmentfmiteelementmodel．Thecomplexcarbodystructurei

3、ssimplifiedprimarilybasedonacertainprinciple．ThenCarbodyfiniteelementmodelisestablishedbasedonHyperMesh；2．TheCarbodystructureperformanceevaluationindexanalysis．AccordingtotherelevantrequirementsofEN12663：2000，thestrengthofcarbodyisanalyzedunderninemainworkingco

4、ndition，andthefreemodalanalysisisalsoprocessedunderbothemptyandfullloadstatus．Byanalyzingtheresults，thebody’Sstressanddisplacementdistributionaresummarized，whichprovidesreferenceforsubsequentanalysis；3．TheestablishmentofCarbodyoptimalapproximationmodel．Onthebas

5、isofmultidisciplinaryparameteroptimizationplatform—Isight，thesampleisobtainedbyusingtheexperimentaldesignmethodfirstly．Bytakingunderframesectionmaterialthicknessasthedesignfactorandtheverticalbendingstiffnessandtorsionalstiffnessandmodalasoutputresponse，approxi

6、matemodelofhighprecisionissetupwithusingtheresponsesurfacemethodbasedonsampleresultsdata；4．Thesectionstructuremulti—objectiveoptimizationdesign．Onthebasisoftheapproximatemodel，thesectionstructureisoptimizedbyusingthedominantgeneticalgorithmNSGA-IIandtheoptimals

7、olutionsetofmulti-objectiveParetoisobtained．Threeoptimizationsolutionarechosenandanalyzedanditshowsthatcomparingwiththeoriginaldesignscheme，thebendingrigidityisstillimprovedwhenthemassdropsinpartofsolution，whichachievetheobjectivesoftheoptimizationdesign；5．Thes

8、hapeoftheCarbodysectionoptimization．TheribangleofunderframesectionischangedbyusingSculptor．ItshowsthatbyusingIsightwhichintegrated、析thSculptorandAnsystocalculate，themethodwh