Fault diagnosis of civil aircraft electrical system based on evidence theory

Dempster-Shafer(D-S) method has been used widely in fault diagnosis system of civil aircraft electrical system, but it has difficulty in dealing with combining evidences with high degree of conflict. In order to solve the problem, a new method is proposed in this paper. The proposed method in this paper introduces the historical data, defines the concept of modifying factor, and considers the influence of expert knowledge to basic probability assignments. The experimental results show that the new method can improve the reliability and accuracy of fault diagnosis results and enhance the performance of the system. This method is a breakthrough in the engineering application of D-S evidence theory.