Study on the steady-state and transient responses of a cracked rotor-bearing system

In this paper the effect of breathing crack on the rotor-bearing system at two steady state and transient responses are discussed. Results are shown in fast fourier and continous wavelet coefficients diagram. Before extracting of system responses, system equation of motion matrix, modeling of crack and its breathing behavior simulation been done. Then with numerical method in solving of equation “Houbolt method“, rotor system responses at two operation mode, steady-state and start-up (Transient signal) for various crack depth has been calculated. For investigate about cracked rotor system responses, we used of signal graph, Fourier transform and finally continuous wavelet transform coefficients power spectra curve. With considering in Mentioned methods, signs of breathing crack in the rotor system are presented.