试验箱风速对航天器部件常压低温热变形试验的影响分析

The effect of ventilation velocity on ambient pressure, low temperature thermal deformation test for spacecraft components

文章以航天器机械臂为研究对象,采用流-热-固耦合方法仿真分析了单一送风形式下,试验箱不同送风速度对机械臂常压低温热变形的影响,并进行了试验验证。分析发现:随着送风速度的增大,机械臂表面的温度场分布更均匀且温度值更接近于设定值,从而更有利于低温热变形试验的实施;但由于存在环境噪声,必须经过静置稳定后才可以进行变形测量。此分析结果可以用于指导航天器部件常压低温热变形试验更加精确、高效地实施。

In this paper, a robot arm is studied, as a typical spacecraft component. The fluid-thermal-structure coupling simulation method is used to analyze the effect of variable ventilation velocities for the test box on the ambient low temperature thermal deformation of the robot arm in the single ventilation manner. Then, the verification test is carried out. Finally, it is found that, along with the rising of the ventilation velocity, the arm temperature will have a better distribution and is more likely to reach the required temperature value, as is beneficial to the test implementation. But, due to the disturbance of the environmental noise, the arm deformation should be measured after the stabilized conditions are reached. The analysis results can be used to guide the implementation of the ambient low temperature thermal deformation test for the spacecraft components toward better accuracy and efficiency.