Application of time-frequency short-term concentrated transform method in bearing ridge line extraction under variable operating conditions

JIANG Yixin1, ZHOU Jun1,2, WU Xing1,2, LIU Tao1,2, LIU Chang1,2

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (13) : 106-114.

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PDF(3450 KB)
Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (13) : 106-114.

Application of time-frequency short-term concentrated transform method in bearing ridge line extraction under variable operating conditions

  • JIANG Yixin1, ZHOU Jun1,2, WU Xing1,2, LIU Tao1,2, LIU Chang1,2
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Abstract

The bearing fault diagnosis and analysis method under variable speed conditions is mostly based on the order tracking method of the spindle speed, but due to design and cost constraints, the wide application of tachometer is limited. However, the order analysis based on time-frequency ridge extraction can be directly analyzed without relying on tachometer. Nevertheless, the current ridge extraction suffers from issues such as poor extraction accuracy and low extraction process efficiency. Based on this, a short-time concentrated transform (STCT) method for ridge extraction is proposed. Firstly, the data in the time-frequency matrix is processed by a vector traversing the frequency matrix to improve the time-frequency resolution. Secondly, the new ridge extraction process is used to extract the time-frequency ridge more efficiently and accurately without increasing the calculation cost. Finally, the accuracy of the method and process is verified by simulation and measured signals, and the superiority of the proposed method is further explained by comparing with other time-frequency methods, and the fault diagnosis under time-varying speed conditions of bearings is finally realized.

Key words

fault diagnosis / time-varying rotational speed condition / time-frequency analysis / ridge extraction

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JIANG Yixin1, ZHOU Jun1,2, WU Xing1,2, LIU Tao1,2, LIU Chang1,2. Application of time-frequency short-term concentrated transform method in bearing ridge line extraction under variable operating conditions[J]. Journal of Vibration and Shock, 2024, 43(13): 106-114

References

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