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《Journal of Vibration and Shock》 2011-09
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Extraction of instantaneous amplitude of order components in engine vibroacoustic signals based on Gabor-reconstruction

JIN Yang1,2,HAO Zhi-yong1,ZHENG Xu1,JING Guo-xi1 (1.Department of Energy Engineering,Zhejiang University,Hangzhou 310027,China; 2.Department of Automotive Engineering,Hubei University of Automotive Technology,Shiyan 442002,China )  
The relationship between the Gaussian window's time standard deviation in the continuous time domain and the ability of the short time fourier transform(STFT) amplitude spectrum with Gaussian window to separate order components was established quantitatively according to numerical experiments.The problems in taking the order slices of the STFT amplitude spectrum as the instantaneous amplitude estimates were pointed out.The premises for successful Gabor order waveform reconstruction were examined.An improved flowchart for Gabor order waveform reconstruction,which abandons the try-and-error mode in choosing the analysis parameters,was formulated based on the established relationship mentioned above.Simulations show that the envelope obtained from the Hilbert transform of the reconstructed order waveform acquired by employing the improved flowchart can be used as a valid instantaneous amplitude estimate.
【CateGory Index】: TK401
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