Validation and correction of pyroshock data based on discrete wavelet decomposition

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (14) : 1-6.

Wang XX 1 Qin ZY 1 Ding JF 2 Chu FL 1

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Abstract

Acceleration data measured in pyroshock experiment usually contain the low-frequency trend, which makes the signal inaccuracy. Therefore the pyroshock data require validation and correction to avoid the integral zero shift. Traditional correction methods are mostly qualitative methods based on experience, which have some limitation. In this paper, a method based on the discrete wavelet decomposition was proposed. In this method wavelet correction parameters were chosen quantitatively by the frequency spectrum and correlation coefficients. The influence of vanishing moments on the result of correction was discussed. The proposed method was applied to validating and correction of the experimental data of pyroshock. It was revealed that this method can remove integral zero shift, correct the shock spectrum and improve the accuracy and effectiveness of the pyroshock test systems.

Key words

pyroshock; / discrete wavelet transform; / shock response spectrum; / decomposition level; / vanishing moments

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Wang XX 1 Qin ZY 1 Ding JF 2 Chu FL 1. Validation and correction of pyroshock data based on discrete wavelet decomposition[J]. Journal of Vibration and Shock, 2016, 35(14): 1-6

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