A new algorithm of diagnosis strategy based on fault criticality

摘要

A new algorithm of diagnosis strategy based on fault mode criticality is proposed, aiming at the lack of consideration to possible damage to the equipment in fault diagnosis and negative impact of test sequence in existing algorithms. The proposed algorithm is mainly composed of heuristic function based on fault mode criticality and optimal single-step search strategy. The optimal tests are selected by heuristic function step by step, until all the failure modes are isolated to the required level and complete system diagnosis strategy is obtained. Compared with the single-step optimization heuristic search algorithm based on failure probability, the proposed algorithm combines the test time, cost factors, possible damage in diagnostic process.