APPLICATION OF WEIGHTED EVIDENTIAL THEORY AND ITS INFORMATION FUSION METHOD IN FAULT DIAGNOSIS

A fault diagnosis method of multi-fault characteristic information fusion is proposed to improve accuracy of fault diagnosis using integrated multi-fault characteristic information.The method is based on the evidence theory improved by the weighted concept.By constructing the fusion diagnosis frame and analyzing the fusion diagnosis principle,uncertainties in all characteristics of fault diagnosis can be weakened each other to the utmost.So the uncertainty of fault diagnosis can be reduced in theory.The result of a rotor experiment shows that the reliability of fault diagnosis upon the multi-fault characteristic information fusion is improved evidently and its uncertainty decreases remarkably.It proves that the proposed method can improve the accuracy and reliability of fault diagnosis.