Analysis of non-stationary signal of the sudden unbalanced spindle based on wavelet noise reduction and short-time Fourier transform

Hu Zhenbang Xu Muxun;Jiang Gedong;Zhang Dongsheng

Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (5) : 20-23.

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PDF(1721 KB)
Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (5) : 20-23.
论文

Analysis of non-stationary signal of the sudden unbalanced spindle based on wavelet noise reduction and short-time Fourier transform

  • Hu Zhenbang1 Xu Muxun1,2 Jiang Gedong1,2 Zhang Dongsheng1
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Abstract

Since the response of a spindle with sudden unbalance shows non-stationary characteristics, it cannot be extracted by signal processing methods using traditional Fourier transform. To tackle this problem, a new signal extracting method combining wavelet de-noising technique and the short time Fourier transform method is proposed in this paper. Firstly, the non-stationary signal of the spindle is filtered and reconstructed by the wavelet de-noising technique. Then, the amplitude of the unbalance response is acquired by the short time Fourier transform method. Finally, the feasibility and the accurately of the proposed method is verified by numerical simulation and practical experiment.

Key words

Wavelet noise reduction / Signal reconstruction / Short-time Fourier transform / Non- stationary signals

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Hu Zhenbang Xu Muxun;Jiang Gedong;Zhang Dongsheng. Analysis of non-stationary signal of the sudden unbalanced spindle based on wavelet noise reduction and short-time Fourier transform[J]. Journal of Vibration and Shock, 2014, 33(5): 20-23
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