导航星间链路驱动机构轴系组件可靠性试验研究

发布时间：2018-02-01 02:29

本文关键词： 轴系组件固体润滑角接触球轴承故障模式与影响分析失效模型等效试验理论加速寿命试验　出处：《北华航天工业学院》2015年硕士论文　论文类型：学位论文

【摘要】：随着北斗二代导航卫星向着服务型开始转变,导航卫星上的驱动机构就要求向长寿命、高精度、高可靠性技术方向发展,轴系组件作为导航星间链路驱动机构的关键执行组件,其性能下降或故障会导致整个导航卫星驱动机构的失效,进而造成整个卫星的指向精度的降低甚至失效。在轨阶段期间,轴系组件需长时间间歇往复运转上百万次,这就对轴系组件的长寿命、高可靠性提出了极高的要求,因此需要进行一定样本轴系组件的可靠性试验来验轴系组件的可靠性及寿命。由于传统寿命试验不能实现航天任务时间节点的要求,而且浪费了大量的资金和人力,有必要对驱动机构轴系组件通过加速寿命试验,以期验证机构的设计寿命和可靠性是否能够满足卫星要求。基于此,本研究项目主要开展了如下研究工作:对轴系组件进行了故障模式与影响分析,并最终确定固体润滑角接触球轴承作为影响轴系组件性能和寿命的关键部件和薄弱环节。研究了加速寿命试验的等效理论,采用完全寿命试验,并以轴系组件的摩擦力矩和旋转精度作为失效判据。完成了轴系组件加速寿命试验技术总体的规划,基于轴系组件物理的失效机理和失效模型,以速度和轴向预紧力作为加速应力开展了双应力加速寿命试验,采用恒定应力的加速寿命试验方法。对轴系组件加速寿命试验装置设备进行了设计和开发,实现了判据数据的实时监测和采集处理,实现轴系的运行情况的监测和寿命判断。本文在加速寿命试验数据的基础上,分析轴系组件的性能参数的退化情况以及通过加速寿命数据得到的轴系组件伪寿命推出正常工况下的寿命,验证轴系组件的寿命符合设计要求,并对不同预紧力的轴系寿命进行分析,最后对轴系组件施加适当预紧力提供实验数据支持。
[Abstract]:With the change of Beidou second generation navigation satellite to service type, the driving mechanism of navigation satellite needs to develop towards long life, high precision and high reliability technology. As the key executive component of the navigation intersatellite link driving mechanism, the shaft system performance degradation or failure will lead to the failure of the whole navigation satellite driving mechanism. During the orbit phase, the shafting module needs a long time intermittent reciprocating operation millions of times, which is the long life of the shafting module. High reliability puts forward very high requirements. Therefore, the reliability test of a certain sample shafting assembly is needed to verify the reliability and life of the shaft assembly. Because the traditional life test can not meet the requirements of the spaceflight mission time node. And wasted a lot of money and manpower, it is necessary to the driving mechanism shafting components through accelerated life test, in order to verify that the design life and reliability of the mechanism can meet the requirements of the satellite. The main work of this research project is as follows: the failure mode and influence analysis of shafting components are carried out. Finally, the solid lubricated angular contact ball bearing is determined as the key component and weak link to affect the performance and life of the shafting assembly. The equivalent theory of accelerated life test is studied, and the complete life test is adopted. Taking the friction moment and rotation precision of the shafting assembly as the failure criterion, the overall planning of the accelerated life test technology of the shafting assembly is completed, based on the physical failure mechanism and failure model of the shafting assembly. Double stress accelerated life test was carried out with speed and axial preload as acceleration stress. The accelerated life test equipment of shafting assembly was designed and developed by using constant stress accelerated life test method. The real-time monitoring and processing of the criterion data and the monitoring and life judgement of the shaft system are realized. This paper is based on the accelerated life test data. The degradation of the performance parameters of the shafting assembly is analyzed and the pseudo-life of the shafting component obtained from the accelerated life data is derived under normal working conditions to verify that the life of the shafting assembly meets the design requirements. The service life of shafting with different pretightening forces is analyzed, and the experimental data are provided to support the shafting components with proper pretightening forces.
【学位授予单位】：北华航天工业学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V416

【引证文献】