基于铺层参数的复合材料耐压壳协同优化设计

Collaborative Optimization for Composite Material Pressure Hull Based on Lamination Parameters

在给定的材料性能条件下,以耐压壳纤维体积分数和层合板厚度为设计变量,以结构质量最小为优化目标进行复合材料耐压壳的布局优化;以铺层参数作为优化变量,综合考虑结构的稳定性及其材料强度,实现了结构铺层方式的优化设计;通过协调各子系统优化结果,实现了适用于潜水器复合材料耐压壳结构/材料一体化的协同优化设计.结果表明:耐压壳结构质量较优化前的降幅为20.57%,临界失稳压力为30.78MPa,失效指数为0.675,优化结果达到预期效果.所提出的基于铺层参数的协同优化方法能够对复合材料耐压壳进行优化设计,解决了直接以铺层角作为设计变量的优化效率低的问题.

Given that the material performances are certain, the layout optimization is accomplished, where the fiber volume fraction and ply thickness are taken as design variables and the objective is the minimum structural mass. The lamination parameters are introduced as optimization variables to achieve structural layup optimization with the structural stability and material strength taken into consideration. The struc- ture/material collaborative optimization of composite material pressure hull is performed by integrating op- timization results of each subsystem. The results show that the mass of the pressure hull decreases by 20.57~, the critical buckling pressure is 30.78 MPa, the failure index is 0. 675. The desired results are achieved. The presented collaborative optimization method based on lamination parameters can optimize the composite material pressure hull with high accuracy and solve problem of low efficiency of optimization with ply angle directly set as design variables.