面向装备健康管理的可测性指标研究

Research on testability indexes for equipment health management

可测性指标是开展可测性设计、验证和评估的依据。针对传统可测性指标主要用于故障可检测性和故障可隔离性水平评价,不能全面反映面向装备健康管理可测性水平的问题,在定性分析装备健康管理对可测性的本质需求基础上,从全域和瞬态角度提出了五个可测性指标以定量描述面向装备健康管理的可测性水平;并基于故障模式状态矢量给出了可测性指标的分析计算流程。最后以某装备柴油机的机体子系统为案例详细说明了可测性指标的计算过程,应用结果表明所提指标具有一定的可行性和合理性,可以有效指导面向装备健康管理的可测性优化设计。

Testability indexes are the basis of testability design, validation and evaluation. To address the problems that the traditional testability indexes are mainly used to evaluate fault detectability level and fault isolability level, and are unable to describe testability level for equipment health management （EHM） comprehensively, based on the qualitative intrinsic requirements analysis of EHM on testability, five testability indexes were defined from the universe and instantaneous angles to describe the testability level for EHM quantitatively, and the detailed analysis and calculation process of the proposed indexes were presented based on failure mode state vector. A certain diesel engine body subsystem was introduced as a case example to illustrate the testability indexes calculation process, and application results show that the proposed indexes are feasible and rational, and they can guide the testability optimization design for EHM effectively.