Abstract:
The additional flexibility matrix and stiffness matrix of a two-crack shaft are obtained based on the concepts of fracture mechanics and strain energy release rate method. In this paper, the effect of crack opening area, crack depth, crack angle on the stiffness and coupling stiffness in the shear direction are discussed. For a rotor system with different crack angles, the shaft stiffness matrix in the application of cracked rotor fault diagnosis is introduced. Results show that the stiffness matrix of shaft under different crack parameters obtained by this method have a high accuracy, take it into the rotor fault diagnosis, the fault characteristics of the rotor can be reflected clearly, so the rotor crack fault will be diagnosed effectively.