星载铰接展开式天线复材支座结构拓扑优化设计

Topology optimization design of composite brace structure for spaceborne articulated deployable antenna

以星载铰接展开式天线为研究对象,以天线结构柔度最小为优化目标,以支座体积为约束条件,对天线复材支座结构进行了拓扑优化设计,建立了原有结构设计的有限元模型,进行了加速度频响分析,与试验数据相比对,加速度响应误差最大为4.69%,1阶固有频率误差为2.83%,验证了有限元模型建模方法的准确性。拓扑优化后的结构与优化前结构比较,天线支座的质量减小了3.8%,天线1阶固有频率增大了11.34%,支座铰链安装处的加速度响应减小了52.88%,减小了对铰链和反射面的振动响应,对于保证天线结构和指向精度的稳定性具有重要意义。

In this article,with the focus on the spaceborne articulated deployable antenna,its composite brace structure is subject to topology optimization,with the minimum compliance as the objective and the brace volume as the constraints.The finite-element model of the original structure is set up and the acceleration frequency-response analysis is carried out.Compared with the test data,the maximum error of the acceleration response is 4.69%,and the error of the first-order natural frequency is 2.83%,which verifies that this finite-element model and the modeling method are both accurate.Compared with the structure before topology optimization,the quality of the antenna brace reduces by 3.8%;the first-order natural frequency increases by 11.34%;the acceleration response at the hinge-fixed location reduces by 52.88%.The vibration response to the hinge and reflector reduce,which has great importance to stability of the antenna structure and pointing accuracy.