同位素热源高温–振动试验用夹具的热仿真分析
Thermal Simulation Analysis of High Temperature-Vibration Test Fixture for Isotope Heat Source

同位素热源的研制在深空探测战略任务中具有重要地位。以“嫦娥”用同位素热源环境试验任务为背景，本文重点探讨同位素热源高温–振动环境试验夹具的热防护设计问题。通过对高温–振动用夹具的热仿真分析可知无冷却措施的常规夹具会使振动台台面温度过高，影响设备的正常工作。因此，提出了采用强制对流换热进行冷却的热防护设计方案，并指出采用冷水强制对流热防护方式可以使夹具垫高座底板处于较低温度，从而使振动台处于正常温度工作。此外，进一步提出了通过材料优选以及夹具结构优化设计方案以更有利于力学载荷的传递。
The development of the positional heat source plays an important role in the strategic mission of deep space exploration. Taking the environmental test task of “Chang’e” with isotope heat source as the background, this paper focuses on the design of thermal protection of isotope heat source high temperature-vibration environment test fixture. Through the thermal simulation analysis of the high temperature-vibration fixture, it can be known that the conventional fixture without cooling measures will cause the temperature of the vibrating table to be too high and affect the normal operation of the equipment. Therefore, a thermal protection design scheme using forced convection heat exchange for cooling is proposed, and it is pointed out that the use of cold water forced convection heat protection can make the fixture base plate at a lower temperature, so that the vibrating table can work at a normal temperature. In addition, it is further proposed to optimize the design of materials and fixture structure to facilitate the transmission of mechanical loads.