Crack modeling and detection in rotating system by using Different FEM beam theories

Abstract

Fault identification in the rotor system In this paper,finite element method used to model a simply support beam. A beam theories has been used in analysis to estimate the natural frequencies of beam which utilized as an indi-cator to presence of crack. Existence of crack in element lead to increase the flexibility of el-ement.Moment of inertia is very sensitive to change of cross section of beam when crack is propagation,therefore the size of crack has been described in this term. Timoshenko and Euler beam theory are used for modeling and detection the crack along the length of shaft with different size and location when rotary effects and shear considered and ignored.