绳索-金属丝网组合结构力热匹配设计

网状可展开天线反射面是由柔性绳索与金属丝网缝制而成的．由于不同材料力热差异引起金属丝网与纤维绳索变形不协调，影响了绳索金属丝网组合结构的预应力分布与形面精度，降低了反射面的电性能．为此，有必要研究绳索金属丝网组合结构的力热匹配设计问题．文中采用只承受张力的两节点杆模拟绳索，利用膜模拟金属丝网结构，建立了绳索金属丝网组合结构力学模型，分析了绳索金属丝网组合结构热变形影响规律，对绳索截面参数进行了匹配设计．以环形桁架网状可展开天线为例，仿真结果表明，采用文中的力热匹配设计方法，在温变环境下反射面的热稳定性得到很大的改善，形面精度提高了92％．

Mechanical-thermal matching design for the rope-wire mesh composite structure

The reflector of the mesh deployable antenna is made of a flexible rope sewn with a wire mesh. Due to the mechanical-thermal differences between two materials, the deformation of the wire mesh is uncoordinated with fiber ropes, which affects the pre-stress distribution and surface accuracy and degrades the electric performance of the reflector. Therefore, it is of great significance to study the mechanical-thermal matching design for the rope-wire mesh composite structure. In this paper, the rope is modeled as a two-point bar which only bears tension, and the wire mesh is modeled as a membrane. Then the mechanical model of the rope-wire mesh composite structure is established to analyze the influence of thermal deformation, and optimizes the design of cross-section parameter of ropes. Finally, the circular truss mesh deployable antenna is used as a numerical example to demonstrate the feasibility of the mechanical-thermal matching design method. Simulation results indicate the thermostability of the reflector is improved under a variable temperature, and the surface accuracy of the reflector increases by 92％, using the proposed mechanical-thermal matching design method for rope-wire mesh composite structures.