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月基望远镜反射镜转台的热-结构耦合分析及验证

发布时间:2019-01-01 13:58  文章来源:笔耕文化传播
【摘要】:为了提高月基望远镜反射镜转台的工作性能,对反射镜转台进行了热-结构耦合分析以及试验验证和在轨验证。根据输入条件、热载荷、热边界等建立有限元模型对反射镜转台结构及主要发热部件进行了温度场计算。将温度载荷,预紧力载荷,边界条件输入结构有限元模型进行了热-结构耦合分析,得到了半封闭U型结构、高精密运动轴系、蜗轮蜗杆热变形和热应力。推导了轴系摩擦力矩的计算公式,将分析计算中的数据代入公式中获得了轴系的摩擦力矩,并根据摩擦力矩选取了合适力矩的电机。计算结果显示,左轴系在低温工况-25℃下摩擦力矩较大,达14.163N·mm;高温工况下摩擦力矩较小,55℃时为4.796N·mm。垂直轴轴系在低温工况-25℃时摩擦力矩为16.45N·mm;高温工况下由于轴系卸载,摩擦力矩为零。结果表明反射镜转台可以在-25℃~+55℃下正常工作。文中还通过试验验证和在轨验证证明了反射镜转台热-结构耦合分析的有效性和合理性。
[Abstract]:In order to improve the performance of the mirror turntable of the lunar base telescope, the thermal-structural coupling analysis, experimental verification and in-orbit verification of the mirror turntable are carried out. According to the input condition, thermal load and thermal boundary, a finite element model is established to calculate the temperature field of the mirror turntable structure and its main heating parts. The thermo-structural coupling analysis is carried out on the finite element model of temperature load, preload load and boundary condition input structure. The semi-closed U-shaped structure, high-precision moving shafting, thermal deformation and thermal stress of worm and worm are obtained. The formula for calculating the friction moment of shafting is derived, and the friction moment of shafting is obtained by inserting the data of analysis and calculation into the formula, and the motor with suitable torque is selected according to the friction moment. The results show that the friction torque of the left shaft system is larger at -25 鈩,

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