【摘要】 本精密光电测试转台用于高精度星敏感器的地面标定检测系统,其置于地面模拟空间环境中,要求其在恶劣的模拟空间环境中具有极高的精度。为了研究精密转台在模拟的空间高、低温真空环境中的变形特点及工作精度,首先分析了转台所处的高、低温真空环境的特点,给出了转台在高、低温真空环境中的主要传热途径,然后合理地选择了转台材料并设计了转台的机械结构,最后应用ANSYS有限元分析软件对转台做了热-结构耦合仿真分析。通过仿真分析,得到了转台在两个极限温度(-60℃和90℃)环境中达到热平衡时的温度变化特性和整体变形量,进而得出了变形对转台在高、低温真空环境中精度的影响。结合对转台的使用精度要求,对转台进行了结构优化设计,最终使转台达到了所需要的工作精度要求。更多还原

【Abstract】 The precision electro-optical testing turntable is used for the ground calibration testing system of star sensor.It is laid in the simulation space environment,and required for high accuracy in the environment.Aiming at the deformation characteristic and the work accuracy of precision turntable when it works in the simulation space and high-low temperature vacuum environment,it analyzes the high-low temperature vacuum environment characteristic,obtains the main diathermanous roads.Then it selects the material for the turntable and designs the turntable structure rationally.Finally,it realizes the thermal-structural simulation analysis.Based on the simulation analysis,it illustrates the temperature change carve and the whole deformation carve when the turntable reaches the calorific balance in two limit temperature environment(-60° C and+90° C),evaluates the deformation affect to the turntable accuracy.Combining with the application requirement of the turntable,it optimizes the structure design.更多还原