Abstract
Aiming at the problem of strong impact, short response period and wide resonance frequency bandwidth of transient vibration signals, a feature enhancement method based on adaptive Tunable Q-factor Wavelet Transform (TQWT) was proposed. Firstly, the characteristic frequency band of the vibration signal was selected according to the time-frequency distribution. Based on the characteristic frequency band, the sub-band average energy weighted wavelet Shannon entropy was used to optimize the number of decomposition layers, quality factor and redundancy of TQWT, so as to achieve the adaptive optimal matching of the impact characteristic components in the vibration signal. Then, the weighted power spectrum kurtosis was used as the impact characteristic index to select the optimal sub-band, Finally, the inverse transform of TQWT was used to reconstruct the optimal sub-band to enhance its weak impact features. The results verify the effectiveness of the algorithm.
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