ROTOR CRACK FAULT DIAGNOSIS METHOD BASED ON NONLINEAR OUTPUT FREQUENCY RESPONSE FUNCTION

The nonlinear output frequency response function(NOFRF) is introduced into fault diagnosis of rotor c rack,a rotor crack fault diagnosis method based on the NOFRF is proposed.In th e proposed method,the NOFRF value is identified in cracked rotor with cracks of different depth and location,and some valuable results are obtained.The exper imental results show that the NOFRF value is sensitive to the racked rotor with cracks of different depth and location.the proposed method is very effective.