收稿日期:2022-05-20加筋圆筒结构重量和屈曲承载力关系的量化分析刘海洋,李栻曦,牛斌(大连理工大学机械工程学院,辽宁大连116024)摘要:加筋圆筒结构对轻量化程度要求高,通过量化分析其屈曲承载力与重量关系为工程早期设计提供参考。首先,探究了加强筋数量或截面类型等单因素变化引起的结构重量变化对其屈曲承载力的影响。进而,以加强筋数量、截面类型、尺寸为设计变量,约束屈曲承载因子下限,建立结构重量最小化的优化模型,探究这些多因素同时变化时加筋圆筒结构重量和屈曲承载力关系。在此分析和优化设计中,采用有限元法计算结构屈曲承载因子,为了获得屈曲承载力和重量关系,在优化设计中引入不同屈曲约束下限获得多组优化设计解,基于最小二乘法拟合出结构屈曲承载力和重量关系曲线。结果表明,在给定设计域、边界约束、载荷工况下竖向加强筋比周向加强筋对结构屈曲承载力影响大,加强筋不同截面类型与重量变化关系不同。结构屈曲承载力与重量关系曲线为非线性,随着结构重量增大屈曲承载力增大,但其增大的幅度逐渐减少。关键词:结构优化设计;屈曲承载力;量化分析中图分类号:TH123文献标志码:A文章编号:1009-9492(2023)03-0121-05QuantitativeAnalysisofStructuralWeightandBucklingBearingCapacityofStiffenedCylinderStructureLiuHaiyang,LiShixi,NiuBin(SchoolofMechanicalEngineering,DalianUniversityofTechnology,Dalian,Liaoning116024,China)Abstract:Stiffenedcylinderstructurerequireshighlightweightlevel.Thereferenceforearlyengineeringdesignbyquantitativeanalysisoftherelationshipbetweenbucklingbearingcapacityandweightwasprovided.Firstly,theinfluenceofstructuralweightchangescausedbysinglefactorchangessuchasthenumberofstiffenersorsectiontypesonthebucklingbearingcapacitywasexplored.Furthermore,thenumberofstiffeners,sectiontypesandsizeswereselectedasdesignvariables,thelowerboundofbucklingloadfactorwasconstrained,andtheoptimizationmodelofstructuralweightminimizationwasestablishedtoexploretherelationshipbetweenstructuralweightandbucklingbearingcapacityofstiffenedcylinderwhenthesemultiplefactorschangeatthesametime.Intheanalysisandoptimizationdesign,thefiniteelementmethodwasusedtocalculatethebucklingloadfactorofthestructure.Inordertoobtai...