Life state recognition method for space bearings based on sensitive time-frequency feature of vibration

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (17) : 134-139.

CHEN Ren-xiang1,2，CHEN Si-yang1，YANG Li-xia1，DONG Shao-jiang1， XU Xiang-yang1，DONG Shao-jiang1

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Abstract

A life state recognition method of space bearings based on sensitive time-frequency feature of vibration was proposed, aiming at solving the problem that the characterization capabilities and recognition rate are weakened for life state feature set of space bearing by non-sensitive feature. The calculation method of life sensitivity index was designed to eliminate the non sensitivity characteristic of life state feature sets，then constructed the life state sensitive feature subsets and reinforced the characterization for life state. Linear local tangent space alignment(LLTSA) was introduced to compress the life state sensitive feature subsets into the low-dimensional life state feature sets, removing the redundant information. Finally, the life state of space bearings was recognized by K-nearest neighbors classifier (KNNC). The feasibility and validity of the present method are verified by experimental results.

Key words

space bearings / vibration / sensitive time-frequency feature / sensitive index / life state

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CHEN Ren-xiang1,2，CHEN Si-yang1，YANG Li-xia1，DONG Shao-jiang1， XU Xiang-yang1，DONG Shao-jiang1. Life state recognition method for space bearings based on sensitive time-frequency feature of vibration[J]. Journal of Vibration and Shock, 2016, 35(17): 134-139

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