改进的VMD-ITD岩石声发射信号联合降噪方法  

Improved VMD-ITD Joint Denoising Method for Rock Fracture Acoustic Emission Signals

作　　者：蔡改贫[1,2] 李洋波 杨丽荣 黄祥海[1] CAI Gaipin;LI Yangbo;YANG Lirong;HUANG Xianghai(School of Mechanical and Electrical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Jiangxi Province Engineering Research Center for Mechanical and Electrical of Mining and Metallurgy,Ganzhou 341000,Jiangxi,China)

机构地区：[1]江西理工大学机电工程学院,江西赣州341000 [2]江西省矿冶机电工程技术研究中心,江西赣州341000

出　　处：《机械科学与技术》2023年第8期1340-1348,共9页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(51464017);江西省重点研发计划项目(20181ACE50034);江西省教育厅科学技术项目(GJJ190452)。

摘　　要：针对岩石破裂声发射信号具有非线性、非平稳以及大样本的特点和传统VMD、ITD算法对降噪处理时存在一定局限性的问题,提出一种改进VMD-ITD联合降噪方法。以钨岩为研究对象,首先采用分量能量比作为VMD的终止条件,将岩石破裂声发射信号分解得到多个IMF分量,将各分量与原始信号的互信息量作为各分量的加权因子进行重构信号,再对重构信号进行ITD分解以达到二次降噪的目的,最后以均方根误差与信噪比为去噪效果评价指标,对比分析VMD、ITD以及改进VMD-ITD联合降噪算法降噪效果。通过试验验证,改进VMD-ITD联合降噪算法在抑制非平稳信号噪声中,其均方根误差为4.5521,信噪比为10.0128。相比单一的VMD、ITD算法,降噪效果更好。Aiming at the characteristics of non-linear,non-stationary and large sample of rock fracture acoustic emission signals and the problem that traditional VMD and ITD algorithms have some limitations in denoising,an improved VMD-ITD joint denoising method is proposed.Taking tungsten rock as the research object,firstly,the component energy ratio is used as the termination condition of VMD,and rock fracture acoustic emission signal is decomposed into multiple IMF components.The mutual information between each component and original signal is used as the weighting factor of each component to reconstruct the signal,and then reconstructed signal is decomposed by ITD to achieve the purpose of secondary noise reduction.Finally,taking root mean square error and signal-to-noise ratio as the evaluation indexes,denoising effects of VMD,ITD and improved VMD-ITD joint denoising algorithm are compared and analyzed.Experiments show that improved VMD-ITD joint denoising algorithm has a root mean square error of 4.5521 and a signal-to-noise ratio of 10.0128.Compared with single VMD and ITD algorithms,it is better.

关 键 词：岩石破裂声发射信号 联合降噪 VMD ITD 互信息 

分 类 号：TN911.4-34[电子电信—通信与信息系统]