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ID:31954585
大小:22.59 MB
页数:80页
时间:2019-01-29
《城际高速列车断面优化设计》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
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
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