形状记忆索网结构模型建立及实验研究

Modeling and Experimental Study of Shape Memory Cable Net Structures

针对星载索网结构天线在轨运行时由于空间环境导致的型面精度降低的问题,提出形状记忆索网结构。将形状记忆合金丝与索网结构进行集成,构成形状记忆索网结构。利用形状记忆合金丝的相变特性对索网结构反射面进行调整,以改善其在轨性能。利用2.2 m索网结构模型开展了常温实验和高低温实验。实验结果表明,常温环境下,形状记忆合金丝对索网结构型面精度的调节能力比较稳定;高低温环境中,与普通索网相比,形状记忆索网结构型面精度较高,形状记忆合金丝对索网结构反射面具有一定的调节作用。

In order to solve the problems of reduced surface accuracy caused by space environment during the operation of spaceborne cable net antenna in orbit,a shape memory cable net structure was proposed.The shape memory alloy wires were integrated with the cable net structure to form a shape memory cable net structure.The reflector of the cable mesh structure was adjusted by using the phase transformation characteristics of shape memory alloy to improve the in orbit performance.Experiments were carried out using a 2.2 m cable net structure model under normal temperature and high and low temperature.The experimental results show that the shape memory alloy wires have a relatively stable ability to adjust the surface accuracy of the cable net structures at room temperature.In high and low temperature environments,compared with ordinary cable net,shape memory cable net structure has higher surface accuracy.Shape memory alloy wires have a certain adjustment effect on the reflector of cable net structures.