【摘要】 系统可靠性设计在很大程度上决定了某轮毂驱动系统中行星减速器的使用寿命，针对研发阶段可靠性分配结果确信度不高和分配深度不够的问题，基于改进失效模式影响与危害性分析(Failure Mode Effects and Criticality Analysis, FMECA)和次序统计量理论，提出了一种行星减速器的可靠性分配方法。分析了行星减速器的基本特征，提出了带有失效正相关修正算子的FMECA公式，表征了子系统复杂度和失效发生度随失效相关程度同向变化的特征。基于Gumbel Copula函数和次序统计量理论建立了可靠性分配模型，为行星减速器的零部件分配了可靠性设计指标。对比不同方法得出的子系统可靠性分配权重，结果显示，由于采用了失效正相关修正算子而且从失效敏感环节角度评估了子系统复杂度，提出的方法得到的分配结果确信度更高，并且该方法实现了更深层次的可靠性分配，对提升行星减速器的使用寿命有一定的帮助。更多还原

【Abstract】 The service life of the planetary reducer in a hub drive system largely depends on the system reliability design. Aimed at the problems of lower credibility and inadequate depth in the reliability allocation, based on improved FMECA formulas and order statistics theory, an advanced reliability allocation method of the planetary reducer is proposed. The basic characteristics of the planetary reducer are analyzed, and FMECA formulas with the positive failure correlation modifying operator are presented, which indicate that the subsystem complexity and the failure occurrence change in the same direction as the failure correlation degree, respectively. Simultaneously, based on the Gumbel Copula function and order statistics theory, the reliability allocation model is established to assign reliability design indices to parts of the planetary reducer. By comparing the subsystem reliability allocation weights obtained by different methods, results show that the allocation result of the proposed method is more credible. It will be helpful to accomplish the deeper reliability allocation and improve the service life of the planetary reducer.更多还原