光学精密工程2018，Vol.26Issue(3)：616-623,8.DOI:10.3788/OPE.20182603.0616
低温环境下材料膨胀系数和润滑对望远镜负载扭矩的影响
Effect of material expansion coefficient and lubrication on telescope load torque under low temperature
摘要
Abstract
In order to improve the accuracy of the servo system at low temperature,the mechanism that the load torque of the telescope increase along with the temperature decrease must be deeply understood.Firstly,the influence factors of friction torque of bearing and the influence of low temperature on load torque were analyzed.The lubricant viscosity with temperature variation was studied.The relationship between load torque and grease was tested and discussed.The results indicate that the fluctuation of load torque without the grease at low temperature is decreased and the linearity of load torque is increased.The influence of clearance on bearing friction torque was also analyzed.The expansion coefficient of different materials at different temperatures was measured by resistance strain gauge method.The correlation coefficient between torque and material expansion was established.The result indicates that the load torque at low temperature is 6.67 times load torque at normal temperature,and the maximum of shortening of material reaches 960με.The research on the mechanism of cryogenic load torque in this paper can provide theoretical and experimental data for the precise control of the telescope under extreme environment.关键词
望远镜/低温环境/摩擦扭矩/热膨胀系数/润滑脂Key words
telescope/low temperature environment/friction torque/thermal expansion coefficient/grease分类
机械制造引用本文复制引用
杜福嘉,李朋辉..低温环境下材料膨胀系数和润滑对望远镜负载扭矩的影响[J].光学精密工程,2018,26(3):616-623,8.基金项目
国家自然科学基金资助项目(No.11373049,11190013) （No.11373049,11190013）
