同步卫星天线反射器的真空非均匀温度模拟试验与分析

NONUNIFORM TEMPERATURE SIMULATION TEST IN VACUUM AND ITS ANALYSIS OF ANTENNA REFLECTOR OF SYNCHRONOUS SATELLITE

本文介绍了同步卫星天线反射器在真空非均匀温度场的变形试验技术及其测量结果。为了实现在反射器上达到低温-150℃、高温120℃,采用了太阳模拟器与红外加热笼综合加热、液氮致冷以及设置各种反射板的方法,获得了较大的温度梯度,使模拟效果较为满意。试验中模拟了太阳照射的四种工况,相应地测量了反射器上的温度与应变分布,并计算了热变形与位移值。该结果对卫星天线结构设计与分析有一定的参考价值。

This paper describes the test technology about distortions and the measurement results of antenna reflector of synchronous satellite under nonuniform temperature field in vacuum.In order to achieve cryogenic temperature-150℃ and elevated temperature 120℃on the reflector, the solar simulator and infrared heating cage were used to carry out synthetic heat, the cryogenic refrigeration of liquid nitrogen and the method of arranging various reflective plates were used. A larger temperature gradient and the satisfactory effect of simulation were obtained. Four work conditions of solar radiation were simulated in the test, the distributions of temperature and strain on the reflector were measured correspon-dently, and the values of thermal deformation and displacements were calculated. This result have definite worth of reference for the structure design and analysis of the satellite antenna.