关键词: 自适应最稀疏时频分析, 广义解调, 相位函数, 频率调制, 滚动轴承

Abstract:

Combining with the advantages of the ASTFA and the generalized demodulation, a generalized demodulation method was proposed based on the ASTFA. Firstly, the original signals were decomposed via ASTFA,and the component and its corresponding phase function were obtained. Secondly, the demodulation phase function was formatted by extracting the secondary and higher order terms of the phase function. Then, the generalized demodulation method was applied to the component using the demodulation phase demodulation function. Finally, the frequency domain analyses were applied to the demodulated component to extract feature information. Simulation and experimental analyses show that the method is very suitable for processing multi-component frequency modulated signals, and can effectively extract the damage characteristic informations of the rolling bearing damages in shifting conditions.

Key words: adaptive and sparsest time-frequency analysis(ASTFA), generalized demodulation, phase function, frequency modulation, rolling bearing