An feature extraction of the key step in prognostic of hydraulic pump. Since vibration signals of hydraulic pump are complex and degradation features are hard to extract, a novel method based upon DCS and relation entropy is proposed. First of all, in order to make reasonable use of feature information, earlier CS is modified by DCT and the DCS algorithm is presented to make fusion of multi-channel vibration signals. And DCS power entropy and singular entropy, which are relatively defined in Shannon entropy and Tsallis entropy, are extracted as features. On this basement, the feature fusion method based on relation entropy is proposed to remain original features performances and improve conciseness. According to max relation entropy criterion and gradual fusion strategy, the four extracted features are fused into a new one, which is considered as degradation feature. Finally, the proposed method is verified by vibration signals sampled from hydraulic pump degradation experiment.
SUN Jian
,
LI Hongru
. Method for Feature Extraction Based on Composite Spectrum and Relative Entropy Fusion[J]. Journal of Mechanical Engineering, 2017
, 53(24)
: 96
-103
.
DOI: 10.3901/JME.2017.24.096
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