基于变分模态分解和改进小波软阈值去噪的压力脉动信号降噪研究  

Denoising Research of Pressure Pulsation Signal Based on Variational Mode Decomposition and Modified Wavelet Soft Threshold Denoising

作　　者：郭弢 周金龙 宋亚磊 王笑语 Guo Tao;Zhou Jinlong;Song Yalei;Wang Xiaoyu(Shijingshan Branch,Beijing District Heating Group Co.,Ltd.,Beijing 100043,China;Key Laboratory of Power Station Energy Transfer Conversion and System,Ministry of Education,North China Electric Power University,Beijing 102206,China)

机构地区：[1]北京市热力集团有限责任公司石景山分公司,北京100043 [2]华北电力大学电站能量传递转化与系统教育部重点实验室,北京102206

出　　处：《水动力学研究与进展(A辑)》2024年第6期944-951,共8页Chinese Journal of Hydrodynamics

摘　　要：针对压力脉动信号中含有的噪声,该文基于变分模态分解、排列熵和改进小波软阈值去噪方法,提出了一套适用于压力脉动信号的降噪方法并进行验证。首先,对于不同噪声强度下的压力脉动信号,使用变分模态分解对含噪压力脉动信号进行分解,得到若干模态分量;然后,通过排列熵分析,依据排列熵阈值,区分噪声主导分量和有用信号主导分量;而后,采取改进小波软阈值去噪提取噪声主导分量中的有用信号成分;最后,重构信号,得到降噪后的压力脉动信号。与其他降噪方法的对比结果证明:基于该文方法得到的降噪结果中含有更少噪声、降噪效果更优。For noise contained in pressure pulsation signals,based on variational mode decomposition,permutation entropy and modified wavelet soft threshold denoising method,a set of denoising method for pressure pulsation signal is proposed and verified in this paper.Firstly,for pressure pulsation signals under different noise intensity,variational mode decomposition is used to decompose the noisy pressure pulsation signals,and several mode components are obtained.Secondly,through permutation entropy analysis,according to permutation entropy threshold,the components dominated by noise and the components dominated by the useful signals are distinguished.Then,the modified wavelet soft threshold denoising method is used to extract useful signal components from the components dominated by noise.Finally,the pressure pulsation signal after denoising is obtained through signal reconstruction.Compared with another denoising method,the results show that the denoising results based on the method in this paper contain less noise and better denoising effects.

关 键 词：变分模态分解 改进小波软阈值去噪 压力脉动信号 信号降噪 

分 类 号：TK734[交通运输工程—轮机工程]