非均匀刚度弹性边界结构优化设计及实验验证

Optimization design for elastic boundary with non-uniform stiffness of cylindrical shells and experimental verification

为解决运载火箭地面试验过程中弹性边界刚度非均匀导致的实验误差问题,提出了基于刚度等效指标的非均匀刚度弹性边界优化设计框架。首先,针对不同载荷工况,对比真实弹性边界与均匀刚度弹性边界情况下主承力筒壳结构的边界响应,研究刚度等效指标的选取,用以表征结构刚度的非均匀性;然后,以刚度等效指标为设计目标开展非均匀刚度弹性边界结构设计,并给出不同工况下的最优结构设计;最后,基于轴压工况下的非均匀刚度弹性边界最优设计,加工制造非均匀弹性边界结构试件,开展非均匀弹性边界结构原理性实验。实验结果显示,真实弹性边界与结构优化设计的非均匀刚度弹性边界结构的力学响应吻合良好,证明了非均匀刚度弹性边界结构优化设计的可行性。

To solve the problem of testing errors from the elastic boundary with non-uniform stiffness of cylindrical shells, the optimization framework for elastic boundary with non-uniform stiffness of cylindrical shells has been proposed.Firstly, the equivalent rigidity indexes are used to represent the non-uniform stiffness of cylindrical shells.Therefore,the equivalent rigidity indexes are investigated through the response comparison of cylindrical shells between real-world boundary condition and elastic boundary structures with uniform stiffness under different loading conditions.Secondly, the optimization of elastic boundary with non-uniform stiffness of cylindrical shells has been performed based on the equivalent rigidity indexes, and the optimum designs are obtained.Finally,the experiment of the optimum design is carried out to verify the approach of design.The results show that the responses of the optimum design for elastic boundary with non-uniform stiffness of cylindrical shells agrees well with one of experimental boundary condition structures.Therefore,optimization design for elastic boundary with non-uniform stiffness of cylindrical shell is reliable.