A model-based technique for the fault detection of rolling element bearings using detection filter design and sliding mode technique

A model-based technique for the fault detection of rolling element bearings in a rotor-bearing system is presented. First, a one-dimensional, multiple degree-of-freedom vibration model for rotor-bearing systems is derived. Based on the theory of detection filter design, two outputs (inner and outer ring acceleration) are defined to enable the detection of inner and outer raceway faults. Simulation is used to illustrate the results of the detection filter. Moreover, due to the noise susceptibility of vibration signals a robust monitoring system, a sliding mode detector, is presented. The sliding mode detector is capable of isolating fault surfaces in the residual space of the detection filter.