A Vibration Analysis Based on Wavelet Entropy Method of a Scroll Compressor

Entropy

Tao Liu¹  Zaixin Wu² 

[1] School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou 730050, China; E-Mail

关键词: vibration analysis;    fault feature extraction;    wavelet entropy;    feature component;    scroll compressor;   

DOI  :  10.3390/e17107076

来源: mdpi

【 摘 要 】

Vibration-based condition monitoring and fault diagnosis is an effective approach to maintain the reliable operation of a scroll compressor. Unfortunately, the vibration signal from the scroll compressor always has characteristics of being non-linear and non-stationary, which makes vibration signal analysis and fault feature extraction very difficult. To extract the significant fault features, a vibration analysis method based on Wavelet entropy is proposed in this paper. Two forms of the wavelet entropy, namely the wavelet space feature spectrum entropy (WSFSE) and the wavelet energy spectrum entropy (WESE), are defined to depict instantaneous characteristics of the local variation of the vibration signal. Four types of mechanical faulty vibration signal, namely unbalanced rotor, malfunctioning scroll, loosened mechanical assembly, and loosened bearing, are analyzed by using the proposed approach. The experimental results show that feature components and energy distribution of each fault signal is accurately identified and revealed, which proves that the combined application of WSFSE and WESE approach is a successful scheme for the vibration analysis of scroll compressors.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.