Abstract
The condition monitoring of a rolling element bearing requires a thorough understanding of the bearing and online evaluation of system health. This paper presents a generic scheme for health monitoring of rolling element bearings. The approach contains vibration modeling and online fault dimension estimation. The parameters of a vibration model are obtained via offline training. A genetic algorithm is applied to a set of data with various operating conditions and fault dimensions to achieve the optimal model parameters. The trained model is then used online in parallel with a real system in service to realize model-based fault detection and diagnosis. To increase the accuracy of diagnosis, an extended Kalman filter is used to address the noises and uncertainties associated with fault dimension estimation. The proposed system is implemented on a case study of rolling element bearing health monitoring and experimental results demonstrate the efficiency of the proposed method.
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