星载固体润滑轴承加速寿命试验基础理论与评估方法研究

As one of the most important mechanical components in spacecraft, life assessment of solid lubricated bearings is crucial to the longevity and high reliability of spacecraft. As the failure mode of solid lubricated bearings is very complicated, this project works on the theory and experimental verification of accelerated life test (ALT) of solid lubricated bearings based on failure mechanism. Firstly, wear and migration principle of lubrication film is investigated, dynamic compound wear principle is derived and failure mechanism is studied. Secondly, based on actual stress history, a stress history design method based on stress block classification for the ALT of solid lubricated bearings is developed. Finally, considering the coupling and concurrency between different failure modes, dependence analysis method is used to build the ALT model based on multiple-failure-mode-dependence for solid lubricated bearings, and the parameter estimation method under small sample situation is given. This project commits to develop systematic theory and statistical method of ALT for solid lubricated bearings on satellite. We hope that the achievements of this project will provide theoretical and technical support to the life assessment of other mechanical transmission components in spacecraft.

作为航天器上重要的机械传动部件，固体润滑轴承的寿命评估对航天器的高可靠和长寿命至关重要。针对我国航天领域固体润滑轴承寿命评估的瓶颈问题，本项目将从失效物理机制出发，开展星载固体润滑轴承加速寿命试验相关研究。首先深入剖析星载固体润滑轴承润滑膜磨损和转移规律，推导动态复合磨损规律并提炼固体润滑轴承的故障机理。在此基础上，根据星载固体润滑轴承的实际工作剖面，给出基于谱块分级和等效损伤加速寿命试验载荷谱设计方法。考虑多故障的耦合性和并发性，使用相关性分析方法建立基于多故障相关的固体润滑轴承加速寿命试验模型，并给出小样本条件下模型参数估计方法。本项目的主要意义是通过以上研究形成系统的星载固体润滑轴承加速寿命试验理论和统计方法，在关键技术上有所突破，同时也将为航天领域其它机械传动部件的寿命评估提供一定的理论依据和技术支持。

固体润滑轴承的寿命评估对航天器的高可靠和长寿命至关重要。本项目从失效物理机制出发，开展星载固体润滑轴承加速寿命试验相关研究。首先深入剖析星载固体润滑轴承润滑膜磨损和转移规律，推导动态复合磨损规律并提炼固体润滑轴承的故障机理。在此基础上，根据星载固体润滑轴承的实际工作剖面，给出基于谱块分级和等效损伤加速寿命试验载荷谱设计方法和基于马尔可夫信息矩阵的加速寿命试验载荷谱设计方法。考虑多故障的耦合性和并发性，建立基于指数—逆幂律方法的固体润滑轴承加速寿命试验模型，并基于贝叶斯方法给出小样本条件下模型参数估计方法。进行了固体润滑轴承的加速寿命试验验证了上述方法和模型的有效性和准确性。通过以上研究，本项目形成了系统的星载固体润滑轴承加速寿命试验理论和统计方法，一定程度上突破了相关关键技术，相关成果也将为航天领域其它机械传动部件的寿命评估提供一定的理论依据和技术支持。