Numerical investigations to suppress thermal deformation of the large deployable reflector during earth eclipse in space
Numerical investigations to suppress thermal deformation of the large deployable reflector during earth eclipse in space
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DOI：
10.1017/aer.2017.33
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
Kaori Shoji;D. Isobe;M. Usui
中科院分区：
文献类型：
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作者：
Kaori Shoji;D. Isobe;M. Usui
摘要 在太空中，结构会遇到各种恶劣的环境，包括恶劣的热条件。在地球食期间，安装在工程测试卫星 VIII (ETS-VIII) 上的大型可展开反射器 (LDR) 发出的无线电波信号电平被观察到发生变化。这种现象被认为是由 LDR 的热变形引起的。因此，在本研究中，提出并论证了一种抑制热变形的方法，重点关注用于展开天线的弹簧处产生的内力。根据有限元分析获得的数值结果，通过调整结构构件的热膨胀系数以及根据距约束点的距离不同地控制四个区域的弹簧力，以高校正率抑制了支撑反射器的所有顶点的热变形。
ABSTRACT In space, structures encounter various severe environments, including severe thermal conditions. The signal level of the radio wave from the Large Deployable Reflector (LDR) mounted on the Engineering Test Satellite-VIII (ETS-VIII) was observed to change during an Earth eclipse. This phenomenon was assumed to be caused by the thermal deformation of the LDR. Therefore, in this study, a means to suppress the thermal deformation is proposed and demonstrated by focusing on the internal force generated at the springs used to deploy the antenna. According to the numerical results obtained from finite element analyses, the thermal deformations at all apices that support the reflectors were suppressed at a high correction rate by adjusting the coefficients of thermal expansion in the structural members and by controlling spring forces differently in four areas depending on the distances from the constraint point.