一种基于复合材料加筋板结构效率的稳定性优化方法

Buckling optimization method based on structure efficiency of composite stiffened panels

提出一种以承载效率最高作为目标的新设计方法,对复合材料加筋板的承载能力进行优化。讨论了不同压缩与弯曲刚度的匹配模式与加筋板临界失稳载荷的关系。将全局失稳载荷、局部失稳载荷与静载荷的接近程度作为结构承载效率的量化标准,通过静载荷的控制,使结构的稳定性向着效率最高的方向优化。以宏观的加筋板压缩与弯曲刚度参数作为设计变量,构建了一种可用于结构效率优化的代理模型,避免了局部最优点的出现,更便于数值寻优。通过有限元分析验证,优化后壁板的临界失稳载荷与所施加的静载荷基本一致,反映出较高的效率,从而验证了该方法的可靠性。

In order to optimize the carrying capacity of composite stiffened panels,a new design method was proposed using maximum carrying efficiency as an objective.Different compression and bending stiffnesses＇ matching relationships were discussed for their effects on the critical buckling loads of stiffened panels.The approaching degree of global buckling load,local buckling load and static load was employed as the quantitative standard to scale the structure＇s carrying efficiency.Under the control of static load,the structural stability was optimized towards the direction of maximum efficiency.An agent model for structure efficiency optimization was built using the panel＇s macroscopic compression and bending stiffness parameters as variables.This model voids the local optimal point and is more suitable for numerical optimization.The critical buckling load of optimized panel is basically in accordance with the static load applied on it by finite element analysis,which shows a high efficiency and proves the reliability of this method.