A method of evaluating health state in rotary machinery

On the basis of state monitoring and fault diagnosis technology for equipments, the faults are classified according to the kind of deterioration of performance parameters, and the probability of the faults is analyzed. In this paper, the fault entropy of equipments is defined through the degree of membership of faults. Fault entropy reflects the probability which the faults of equipment may occur. Moreover, a new index is put forward which can comprehensively reflect the health state of equipments on the basis of the fault entropy and monitoring information of the equipment. This method is applied to evaluate the health state of hydraulic turbine and it shows that the method proposed in this paper is effective and practical.