發(fā)布時(shí)間：2019-01-01 13:58

【摘要】：為了提高月基望遠(yuǎn)鏡反射鏡轉(zhuǎn)臺(tái)的工作性能,對反射鏡轉(zhuǎn)臺(tái)進(jìn)行了熱-結(jié)構(gòu)耦合分析以及試驗(yàn)驗(yàn)證和在軌驗(yàn)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(tái)結(jié)構(gòu)及主要發(fā)熱部件進(jìn)行了溫度場計(jì)算。將溫度載荷,預(yù)緊力載荷,邊界條件輸入結(jié)構(gòu)有限元模型進(jìn)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(yùn)動(dòng)軸系、蝸輪蝸桿熱變形和熱應(yīng)力。推導(dǎo)了軸系摩擦力矩的計(jì)算公式,將分析計(jì)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(jī)。計(jì)算結(jié)果顯示,左軸系在低溫工況-25℃下摩擦力矩較大,達(dá)14.163N·mm;高溫工況下摩擦力矩較小,55℃時(shí)為4.796N·mm。垂直軸軸系在低溫工況-25℃時(shí)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(tái)可以在-25℃~+55℃下正常工作。文中還通過試驗(yàn)驗(yàn)證和在軌驗(yàn)證證明了反射鏡轉(zhuǎn)臺(tái)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(hào)：2397666