Feature Extraction Method for Hydraulic Pump Fault Signal Based on Improved Empirical Wavelet Transform

Processes

Baozhong Wang¹  Zhi Zheng¹  Zhijun Wang¹  Shengnan Tang²  Yong Zhu² 

[1] College of Mechanical Engineering, North China University of Science and Technology, Tangshan 063210, China;National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China;

关键词: hydraulic pump;    fault signal;    feature extraction;    empirical wavelet decomposition;    power spectrum density;    feature energy ratio;   

DOI  :  10.3390/pr7110824

来源: DOAJ

【 摘 要 】

There are many interference components in Fourier amplitude spectrum of a contaminated fault signal, and thus the segment obtained based on the spectrum can lead to serious over-decomposition of empirical wavelet transform (EWT). Aiming to resolve the above problems, a novel method named improved empirical wavelet transform (IEWT) is proposed. Because the power spectrum is less sensitive to the contaminated interference and manifests the presence of fault feature information, IEWT replaces the Fourier amplitude spectrum of EWT with power spectrum in segment acquirement, and threshold processing is also introduced to eliminate the bad influence on the acquirement, and thus the best decomposition result of IEWT can be obtained based on feature energy ratio (FER). The loose slipper fault signal of hydraulic pump is tested and verified. The result demonstrates that the proposed method is superior and can extract the fault feature information accurately.

【 授权许可】

Unknown