关键词: 故障诊断, 事件序列, 基本组成单元, 模糊诊断

Abstract: Aiming at the existent of repeatability and indetermination factor in the fault diagnosis, a fault diagnosis improved method based on fuzzy relations is proposed. It integrates the fuzzy theories to the fault diagnosis, comprehensively considers both sides of the minimal cut set of the fault tree and basic component unit, designs the diagnostic process of the fault tree, improves the faults which repeat diagnosis in fault diagnosis of the former and the system diagnosis is optimized. By comparing with the other methods on the subsystem of airplane hydraulic pressure, this method can demonstrate the correctness of the result and save the diagnosis time.

Key words: fault diagnosis, event sequence, basic component unit, fuzzy diagnosis