Influence Matrix Approach to Fault Diagnosis of Parameters in Dynamic Systems

A new diagnostic method has been developed, which consists of on-line identification of system models, fault detection, and fault estimation using an influence matrix. A fault in system parameters is detected by the changes in the identified models, and the faulty parameter and its variation are estimated using the influence matrix. This method can detect a step-as well as a gradual-change fault and is applicable where the physical values of parameters are not known accurately. Simulation studies have been carried out on a motor driving system with very good results.