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ID:31993056
大小:1.83 MB
页数:60页
时间:2019-01-30
《频率双向渐进优化方法中的新插值技术》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Abstract,nleevolutionarystructuraloptimizationmethodisanumericalmethodappliedonstructuraltopologyoptimizationrecently.Themethodisbasedontheideathatbygraduallyremovingtheinefficientmaterial,theresidualshapeofstructurewillevolvetowardsanoptimum.Becauseonlyelementremovingisallowedintraditionalevoluti
2、onarystructuraloptimizationmethod,whengivenapoorinitialdesign,itmayproduceafmaistructureundesirable.111eimprovedevolutionarystructuraloptimizationmethodusedinthispaperallowsmaterialstobeaddedaswellasremoved,anditisthereforecalledbidirectionalevolutionarystructuraloptimizationmethod.Ineverystepofth
3、eevolutionaryprocess,bidirectionalevolutionarystructuraloptimizationmethodneedstofindallofthedeletingandaddingelements.Thedeletingelementsarethepartsofthepresentstructure.Thedisplacementsofthedeletingelements’nodesareknown.Astotheunknowndisplacementsofthenodesontheboundaryofthestructure,traditiona
4、lbidirectionalevolutionarystructuraloptimizationmethodadoptsextrapolationmethods.Traditionalextrapolationmethodcanonlybeappliedonregularrectangleelementorcuboidalelement.Ifthestructureisdispersedbyirregularelements,themethodwillencounterdifficulties.111ispaperisconsistoftwopartswork.Inregardtothef
5、irstpartofthework,thispaperstudiestheinfluenceoftwodifferentextrapolationmethods,linearandquadratic,forEight-nodeQuadrilateralelementonthefinaldesign.Anexampleisgivenanditisshownthatinbidirectionalevolutionarystructuraloptimizationmethod,extrapolationmethodshavesignificantinfluenceontheaccuracyofs
6、ensitivitynumber.Inallusiontothelimitationoftheabove-mentionedmethod,thepaperbringsforwardanewmethodtoestimatetheunknowndisplacementsoftheboundaryadditionalelements.ThemethodiShaseduponanewidea.Atierthenormalmodesanalysis,accordingastheknowndisplacementsofthenodesintheintra-domain,unknowndisplacem
7、entsofthenodesontheboundaryofthestructurewillbecalculatedbylinearstaticmethod.Thearticleputsforwardtwolinearstaticextrapolationmethod.Theyaletotallinearstaticextrapolationmethodandonebyoneelementallinearstaticext
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