Fault severity assessment for rolling element bearings based on LMD and Lempel-Ziv index
ZHANG Chao1,2, CHEN Jian-jun2
1. School of Information Engineering University Of Science and Technology Of The Inner Mongol, 014010 China；2. School of Electronic-Mechanical Engineering Xidian University, Xi’an, 710071 China
Abstract：Abstract: In view of the different rotation speeds and inner and outer race defects severity, a fault severity assessment scheme based on local mean decomposition (LMD) and Lempel-Ziv was put forward in this paper. LMD method is a new adaptive time-frequency analysis method. The bearing vibration signal was decomposed into several product functions with instantaneous frequency having physical meaning. The optimal PF component can be found according to kurtosis conditions. On the base of the best PF, the normalized Lempel-Ziv values were calculated for the envelope. Then the values were summed up with given weights to form a final measure named the integrated Lempel-Ziv index. Finally, the different fault damage intervals were found. At the same time, for making conclusions more universal, the bearing fault Lempel-Ziv index distribution rule of the inner and outer in different rotating speed were studied. The experiment results showed that the algorithm can effectively apply in rolling bearing fault diagnosis.
张超 陈建军 . 基于LMD和Lempel-Ziv指标的滚动轴承故障损伤程度研究[J]. , 2012, 31(16): 77-82.
ZHANG Chao;CHEN Jian-jun. Fault severity assessment for rolling element bearings based on LMD and Lempel-Ziv index. , 2012, 31(16): 77-82.
2012, Vol. 31 
