基于理想点法的加筋板屈曲承载力优化

目的针对加筋板在使用工况中易发生屈曲和结构失稳,提出一种基于理想点法的屈曲承载力优化设计方法。方法以加筋板的屈曲承载力最大和结构质量最小为目标,以加筋板的屈曲、最大vonMises应力和筋条压损等为约束条件,并利用理想点法将多目标优化问题转化为单目标优化问题。基于ANSYS参数化建模技术,构建屈曲分析、优化设计一体化分析与设计模型,并采用单目标优化算法——DOWNHILL SIMPLEX算法实施了优化分析。结果优化后结构质量从0.195 kg增加到0.24 kg,增加了23%,结构承载力从129.4 k N提升到235.84 kN,提高了82%。结论通过优化能够获得结构性能折中的方案,可为加筋板结构设计应用提供参考。

Buckling Capacity Optimization of Stiffened Panels Based on Ideal Point Method

Objective To propose a buckling capacity optimal method based on ideal point method in view of the problem that stiffened panels are susceptible to buckling and structural instability in actual conditions. Methods The buckling capacity optimal method was established to maximize the buckling capacity and minimize the weight of the structures subjected to constraints on buckling, maximum von Mises stress as well as crippling, and the multi-objective optimization problem was converted to single-objective problem via ideal point method. Based on ANSYS parametric modeling technology, the integration of buckling analysis and optimization design model was constructed. A single-objective optimal algorithm of DOWNHILL SIMPLEX was adopted to implement the optimization analysis. Results The weight was raised from 0.195 kg to 0.24 kg, and the structural load-capacity was improved from 129.4 kN to 235.84 kN, with an increase of 23% and 82% respectively. Conclusion A compromised design might be achieved by optimization, which may provide a reference for design and applications of the stiffened panel structures.