基于离散小波分解的火工冲击数据有效性分析与校正方法

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (14) : 1-6.

论文

王锡雄1，秦朝烨1，丁继锋2，褚福磊1

作者信息 +

Validation and correction of pyroshock data based on discrete wavelet decomposition

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

Author information +

文章历史 +

摘要

由于火工冲击试验条件的限制，测试所得冲击加速度信号中通常含有低频趋势项，导致试验数据不准确。因此需要对信号进行有效性分析，校正信号，消除积分零漂。现有的校正方法大都是基于经验的定性方法，具有一定的局限性。本文基于离散小波分解，提出了一种冲击数据有效性分析方法，该方法通过分析信号的频谱与相关性，能够定量确定小波分解层数的范围，此外本文还讨论了Db小波基函数的消失矩对数据校正结果的影响。通过这种方法对某分离冲击试验数据进行有效性分析与校正，证明该方法能够有效抑制积分零漂，消除趋势项对冲击谱的影响，提高试验数据的准确性和有效性。

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.

导出引用

王锡雄1，秦朝烨1，丁继锋2，褚福磊1. 基于离散小波分解的火工冲击数据有效性分析与校正方法[J]. 振动与冲击, 2016, 35(14): 1-6

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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