Spectral Ratio Method for Fault Detection in Rotating Machines

This study presents the ratio, which is defined between two vibration signals in the spectral domain, to be used in extracting the fault signatures from the signals. These two signals are considered as two different cases of the electric motor of 5 HP in terms of the faulty and healthy motor cases and hence, the comparison between two spectral variations is used as a method to show the fault characteristic. In this manner, the bearing damage of the electric motor of 5 HP are given within the range of 0-4 kHz and its J-curve is presented as an indication of the motor aging.