西安电子科技大学学报

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绳索-金属丝网组合结构力热匹配设计

李团结1;杨丽1;李洋2;马小飞2   

  1. (1. 西安电子科技大学 机电工程学院,陕西 西安 710071;
    2. 中国空间技术研究院西安分院,陕西 西安 710000)
  • 收稿日期:2017-04-13 出版日期:2018-04-20 发布日期:2018-06-06
  • 作者简介:李团结(1972-),男,教授,E-mail:tjli@mail.xidian.edu.cn
  • 基金资助:

    国家自然科学基金资助项目(51775403, U1537213)

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

LI Tuanjie1;YANG Li1;LI Yang2;MA Xiaofei2   

  1. (1. School of Mechano-electronic Engineering, Xidian Univ., Xi'an 710071, China;
    2. China Academy of Space Technology(Xi'an), Xi'an 710000, China)
  • Received:2017-04-13 Online:2018-04-20 Published:2018-06-06

摘要:

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%.

关键词: 网状可展开天线, 绳索, 金属丝网, 组合结构, 力热匹配

Abstract:

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.

Key words: mesh deployable antenna, rope, wire mesh, composite structure, mechanical-thermal matching