高体份SiC/Al复合材料空间相机框架的拓扑优化设计

为了提高空间相机在力/热双重环境条件下的系统稳定性，同时能够实现系统的轻量化目标，在某型空间相机的研制过程中选用了具有高比刚度和热稳定性的高体份SiC/Al复合材料。采用整体式框架结构，将基于变密度法的连续体结构拓扑优化方法应用到相机框架结构的初始设计中，通过设定相应的约束条件和目标函数，进行迭代求解，得到了相机框架分别在X、Y、Z三个方向重力作用下的结构拓扑优化结果，结合工艺要求，最终确定了空间相机框架的设计方案。通过与对比方案比较发现，经过拓扑优化所得到的框架结构在结构刚度及轻量化率上都有明显提高，实现了空间相机框架高刚度、轻量化的设计目标。

Design and topology optimization of space camera frame fabricated by high volume fraction SiC/Al composite material

In order to improve the system stability of space camera under the force and heat dual environmental conditions, at the same time to achieve lightweight system, high volume fraction SiC/Al composite material with high stiffness ratio and thermal stability has been used in the space camera. According to the integral frame structure, the continuum structure topology optimization based on the variable density method was introduced in the initial design of space camera frame. Iterative solution was operated by setting the corresponding constraints and objective function. The result of topology optimization was obtained under the gravity in X, Y, Z direction. Combining with process requirements, the design of space camera frame was determined finally, and compared with the traditional one. The comparison result shows that the structure stiffness and lightweight ratio of frame structure have been improved after topology optimization. And it helps achieving the design targets of high stiffness and lightweight ratio.