关键词: 局部均值分解, 独立成分分析, 故障特征提取, 故障诊断

Abstract: Aiming at the problem of existing the end effect, easily producing false component. The local mean decomposition (LMD) was used in analysis of non-stationary and nonlinear signals containing noise and the underdetermined problem of the single channel independent component analysis (ICA) blind source separation, the feature extraction algorithm of the vibration signals based on the noise reduction LMD-ICA was proposed. By applying the algorithm, the fault of rolling bearing is diagnosed, firstly, the original signals are decomposed by LMD, the n instantaneous frequency product function (PF) components with physical significance are obtained and the end effect is limited. Then the obtained PF components which are arranged into one sequence combination per constant third-order PF components are analyzed by independent component. And n-2 refactoring components can be obtained by ICA. At last, the fault signals of which the noises are reduced are decomposed by LMD or calculated by power spectrum again to extract the fault. According to the experiment, the multi-types fault signals of rolling bearing can be effectively recognized by the method proposed above.

Key words: local mean decomposition, independent component analysis, fault feature extraction, fault diagnosis