空间机械臂关节的热设计与热分析

Thermal Design and Analysis of Space Manipulator Joint

针对空间机械臂关节内部功耗大、散热路径复杂、工作时间长、工作姿态复杂多变的热特点,对空间机械臂关节进行了详细热控设计,并进行了低温工况和4种高温工况下的热分析。通过低温工况的分析计算,得到了主动热控平均功耗为14.5W,关节温度在-30.8^-20.8℃范围内,满足存储温度指标。高温工况分析了不同阳光照射状态下关节的温度分布及最长可工作时间,关节在极端高温状态下可工作2h,满足使用要求。

The joint of space manipulator has the characteristics of high internal power, complex heat dissipation path, long working time and the complex work attitude which brings serious challenges to the thermal design. Considering the above characteristics, a detailed thermal control scheme was proposed for the space manipulator joint. Thermal analysis was carried out under extreme conditions including a low temperature condition and four high temperature conditions. The analysis of the low temperature condition showed that the average power consumption of active thermal control was 14.5 W and the temperature of the joint was within the range of -30.8 ℃ to -20.8 ℃. As to the high temperature conditions, the temperature distribution and the longest working time of the joint were analyzed for different solar radiation states. The joint could work 2 hours at extreme high temperature which could meet the requirements of usage.