Application of CEEMD and adaptive wavelet threshold combined noise reduction in the OPAX method

被引：0
|
作者：
Chen K. [1 ,2 ]
Zhang X. [1 ]
Li N. [1 ]
机构：
[1] School of Automobile and Transportation, Shenyang Ligong University, Shenyang
[2] Liaoning Engineering Research Center for Automotive Noise, Vibration and Safety, Shenyang
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2021年 / 40卷 / 16期
关键词：
Complementary ensemble empirical mode decomposition(CEEMD); Operational path analysis with exogeneous inputs(OPAX); Sample entropy; Wavelet packet threshold noise reduction;
D O I：
10.13465/j.cnki.jvs.2021.16.024
中图分类号：
学科分类号：
摘要：
An improved method based on a combination of the complementary ensemble empirical mode decomposition (CEEMD) and adaptive wavelet threshold noise reduction was proposed for improving the analysis accuracy of operational path analysis with the exogeneous inputs (OPAX) method from the point of noise reduction. Sample entropy was used to divide the Intrinsic Mode Function of the decomposed signal into noise components, noisy components, and signal components. The noise components were eliminated, and the normalized sample entropy of different noisy components as the adjustable parameter was applied in the newly constructed wavelet threshold function to improve the noise reduction effect based on the noisy condition to adjust the threshold function. The noise components after noise reduction and the signal components were reconstructed together to obtain a complete signal, and simulation calculations verified that the above method can preserve the integrity of the original signal to the greatest extent. The method was used in the OPAX model to reduce the noise of its operating condition data (time-domain vibration signal). Compared the composite response and measured response of the target point in the second-order case of the engine with other noise reduction methods, it is found that the composite response in the improved OPAX method on a basis of the method of CEEMD and adaptive wavelet threshold combined noise reduction is very close to with the measured response. © 2021, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：192 / 198
页数：6
相关论文
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