TY - JFULL AU - B. X. Tchomeni and A. A. Alugongo and T. B. Tengen PY - 2015/12/ TI - Time-Frequency Modeling and Analysis of Faulty Rotor T2 - International Journal of Mechanical and Mechatronics Engineering SP - 1978 EP - 1988 VL - 9 SN - 1307-6892 UR - https://publications.waset.org/pdf/10003154 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 107, 2015 N2 - In this paper, de Laval rotor system has been characterized by a hinge model and its transient response numerically treated for a dynamic solution. The effect of the ensuing non-linear disturbances namely rub and breathing crack is numerically simulated. Subsequently, three analysis methods: Orbit Analysis, Fast Fourier Transform (FFT), and Wavelet Transform (WT) are employed to extract features of the vibration signal of the faulty system. An analysis of the system response orbits clearly indicates the perturbations due to the rotor-to-stator contact. The sensitivities of WT to the variation in system speed have been investigated by Continuous Wavelet Transform (CWT). The analysis reveals that features of crack, rubs and unbalance in vibration response can be useful for condition monitoring. WT reveals its ability to detect nonlinear signal, and obtained results provide a useful tool method for detecting machinery faults. ER -