摘要
针对航天仪表轴承摩擦力矩敏感的应用场合,建立了冠形保持架六自由度运动分析模型,借助四阶Runge-Kutta数值算法,通过变步长方法提高运算速度,求出保持架的运动规律,获得其对轴承总摩擦力矩的影响比重。理论分析结果与非接触激光线位移传感器测得保持架轴向运动、YZC-II仪测试轴承总摩擦力矩试验结果吻合较好,验证程序的可行性。分析表明,对航天仪表轴承保持架在极低速低载工况下,保持架与球滑动引起的摩擦力矩不可忽视,尤其在启动过程中,占轴承总摩擦力矩比重较大。
For the applications of sensitive to the friction moment of aerospace instrument bearing, the model of the crown style cage with six degree-of-freedom is built. The conventional fourth-order Runge-Kutta method with variable time steps is used to perform the numerical integration. The cage motion is obtained and the proportion of friction moment caused by cage in the bearing＇ s total friction moment can be known. The cage axial motion can be measured by using a non-contact laser linear displacement sensor, and the bearing＇ s total friction moment can be measured by YZC-II tester. Comparing these experimental results to calculated results, an acceptable consistent is achieved, which can help to verify of feasibility of the program. The analysis shows that for the aerospace instrument bearings working at ultra-low speeds and under low loads, the friction moment caused by cage cannot be neglected, and especially it occupies a large proportion in the bearing＇ s total friction moment at the startup time.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2014年第1期47-53,共7页
Journal of Astronautics
基金
"十一五"国家重点科技项目(D09-0109-06-004)
上海市教委高校创新团队项目(B-48-0109-09-002)
关键词
航天仪表轴承
摩擦力矩
冠形保持架
极低速
Aerospace instrument bearing
Friction moment
Crown style cage
Ultra-low speed
