Health Condition Identification of Rolling Element Bearing Based on Gradient of Features Matrix and MDDCs-MRSVD

Bearing is a key component in rotary machines, and the performance of the rotary machines mostly depends on the bearing health condition. In order to improve the safety and maintenance plan of the product based on the bearing condition, a monitoring indicator is constructed to identify the health condition of bearings in real time. First, the vibration signal is processed by the proposed maximal difference of the detail components in multiresolution singular value decomposition (MDDCs-MRSVD) algorithm. Second, the features matrix is constructed by selected features to reflect the health condition of bearings. Then, the gradient standard deviation of each sampling time is obtained by the gradient in the amplitude direction of the features matrix. Finally, a monitoring indicator can be constructed to identify healthy stages of bearing. The proposed methods are verified via the tested datasets provided by Intelligent Maintenance Systems, and Xi'an Jiaotong University and the Changxing Sumyoung Technology Company Ltd (XJTU-SY). The results indicate that the proposed method is efficient and accurate to monitor and identify the health stages of bearing in real time.

Automated summary

This study proposes a method based on vibration signals and feature matrix to monitor and identify the health condition of bearings in real time. The results show that this method is efficient and accurate.