發(fā)布時間：2019-01-01 13:58

【摘要】：為了提高月基望遠鏡反射鏡轉(zhuǎn)臺的工作性能,對反射鏡轉(zhuǎn)臺進行了熱-結(jié)構(gòu)耦合分析以及試驗驗證和在軌驗證。根據(jù)輸入條件、熱載荷、熱邊界等建立有限元模型對反射鏡轉(zhuǎn)臺結(jié)構(gòu)及主要發(fā)熱部件進行了溫度場計算。將溫度載荷,預緊力載荷,邊界條件輸入結(jié)構(gòu)有限元模型進行了熱-結(jié)構(gòu)耦合分析,得到了半封閉U型結(jié)構(gòu)、高精密運動軸系、蝸輪蝸桿熱變形和熱應力。推導了軸系摩擦力矩的計算公式,將分析計算中的數(shù)據(jù)代入公式中獲得了軸系的摩擦力矩,并根據(jù)摩擦力矩選取了合適力矩的電機。計算結(jié)果顯示,左軸系在低溫工況-25℃下摩擦力矩較大,達14.163N·mm;高溫工況下摩擦力矩較小,55℃時為4.796N·mm。垂直軸軸系在低溫工況-25℃時摩擦力矩為16.45N·mm;高溫工況下由于軸系卸載,摩擦力矩為零。結(jié)果表明反射鏡轉(zhuǎn)臺可以在-25℃~+55℃下正常工作。文中還通過試驗驗證和在軌驗證證明了反射鏡轉(zhuǎn)臺熱-結(jié)構(gòu)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，

本文編號：2397666