|Incipient Fault Detection of Full Ceramic Ball Bearing Based on Modified Observer
Huaitao Shi*, Maxiao Hou, Yuhou Wu, and Baicheng Li
International Journal of Control, Automation, and Systems, vol. 20, no. 3, pp.727-740, 2022
Abstract : As a key part of the energy transmission chain, full ceramic ball bearing elements are considered as important components in ultraprecise rotating machines, which is required as a special attention in order to avoid expensive production shutdown due to the appearance of massive failures. Therefore, it is necessary to detect the appearance of incipient faults for full ceramic ball bearing elements by implementing an appropriate model. In this paper, an observer-based incipient fault detection method for full ceramic ball bearings is proposed. Firstly, the mechanism model of full ceramic ball bearing with incipient faults is established, and it is converted into a discrete-time model based on the zero-order hold equivalent method. Secondly, a modified observer is proposed as a residual generator, which has more design degrees of the freedom than the Luenberger observer. Thirdly, the l1/H∞ performance is introduced to enhance the disturbance robustness and incipient fault sensitivity. In addition, the design of an adaptive threshold can effectively avoid fault false alarms. Finally, the effectiveness of the proposed method is verified by numerical simulation.
Discrete-time model, full ceramic ball bearing, incipient fault detection, modified observer.