空间展开臂关节真空−热−力耦合试验方法研究

Method for vacuum-thermal-mechanical coupling test of space deployable arm joint

针对空间展开臂关节热真空环境下展收性能验证的需求,提出一种适用于展开臂关节的真空−热−力耦合的试验方法,即通过热真空试验系统完成真空、冷黑和太阳辐射环境的模拟,通过外部定量惯量盘施加负载。对该方法开展试验验证的结果表明:试验过程中罐体真空度、温度及控温精度均满足试验要求;高低温环境下展开臂关节工作电流呈随机状波动,波动范围均处于设计安全范围内;试验前后展开臂关节启动力矩、关节最高转速以及指向精度无明显变化,且精度优于0.001°。该方法可为后续展开臂关节真空−热−力耦合试验提供技术保障。

Aiming at the requirements of verifying the deployment performance of the space deployable arm joints under thermal vacuum,a vacuum-thermal-mechanical coupling test method for deployable arm joint was proposed.The thermal vacuum test system was used to simulate the vacuum,cold black and solar radiation environment.The load was applied by an external quantitative inertia disk.The test result show that the vacuum degree,the temperature and the temperature control accuracy of the tank body all meet the test requirements.Under high and low temperatures,the working current of the deployable arm joint fluctuates randomly,and the fluctuation range is within the safe margin of the design current.Before and after the test,there is no significant change in the starting torque of the deployable arm joint,the maximum joint revolving speed and the pointing accuracy,in which the accuracy is better than 0.001°.This method may provide technical support for the subsequent vacuum-thermal-mechanical coupling test of the deployable arm joint.