Typical Fault Mode Determination for Rotor Test Rig Based on Correlation Dimension and Kolmogorov Entropy

This paper experimentally investigates the vibration faults of rotor, such as the unbalance, the loosening and the friction, using the rotor test rig. According to the theory of fractal and chaos, the vibration signal series are reconstructed. By the calculation of correlation dimension and Kolmogorov entropy, the dynamic characteristics of the system are then reproduced. The results show that the correlation dimension and Kolmogorov entropy of friction fault are the largest, that of the loosening fault are little lower, and that of the unbalance fault are the smallest. Different faults have different range of correlation dimension and Kolmogorov entropy, and they can be used to identify the fault symptoms.