组合结构屈曲稳定性优化设计与灵敏度分析

OPTIMUM DESIGN AND SENSITIVITY ANALYSIS FOR BUCKING STABILITY OF COMPLEX BUILT-UP STRUCTURES

本文研究了组合结构屈曲稳定性优化设计及灵敏度分析数值方法 ,讨论了屈曲临界荷载灵敏度对应力场和载荷的依赖关系、及其在尺寸和形状变量中的不同计算方法 ,将屈曲优化与静力和动力优化联合执行 ,在JIFEX软件中实现以解决复杂的结构优化问题。算例表明了优化方法在结构稳定性设计中的应用 。

The paper studies numerical methods of design optimization on structural buckling stability and sensitivity analysis.The dependence of the buckling load sensivivities on the stress field and external loads is discussed,and different calculation methods for the size and shape variables are proposed.The buckling optimization is combined with the static and dynamic optimizations.The methods are implemented in JIFEX software to deal with complicated problems of structural optimization.Numerical examples are given to demonstrate the applications of buckling design optimization,and the effectiveness of methods and program of this paper.