混凝土缺陷信号变分模态分解与超声成像方法  

Research on variational mode decomposition of concrete defect single and ultrasonic imaging method

作　　者：张奇[1] 韩庆邦[1] 孙刘家 靳琪琳 王溢秋 刘志鹏[1] ZHANG Qi;HAN Qingbang;SUN Liujia;JIN Qilin;WANG Yiqiu;LIU Zhipeng(School of Information Science and Technology,Hohai University,Changzhou 213200,China)

机构地区：[1]河海大学信息科学与工程学院,常州213200

出　　处：《应用声学》2024年第4期829-835,共7页Journal of Applied Acoustics

基　　金：国家自然科学基金项目(12174085)。

摘　　要：混凝土的强散射特性限制了其中缺陷声波成像的分辨率。该文采用一种依据变分模态分解与全聚焦成像相结合的方法,将接收信号分解成多个本征模态函数,计算各本征模态函数与激励信号的相关系数,对信号加权重构以实现对特征信号的提取,从而提高成像算法对混凝土缺陷间散射波互干扰的鲁棒性。通过设置对比试验,研究了不同缺陷混凝土结构中该信号处理方式对于成像结果的影响。试验结果表明,该方法对于弱散射及散射干扰具有更好的鲁棒性,相比基于原始数据的成像方法能够更好地还原混凝土内部结构。The highly scattering characteristics of concrete limit the resolution of acoustic imaging of defect.This paper uses a method based on the combination of variational mode decomposition and total focusing method.The received signal is decomposed into multiple intrinsic mode functions,and the correlation coefficient between each intrinsic mode function and the excitation signal is calculated.The signal is weighted and reconstructed to realize the extraction of the characteristic signal,and improve the robustness of the imaging algorithm to the mutual interference of scattered waves between concrete defects.The comparative experiment is set up to study the influence of the signal processing method on the imaging results in concretes structures with different defects.The experimental results show that the method has better robustness to weak scattering and scattering interference.Compared with the imaging method based on raw data,it can better restore the internal structure of concrete.

关 键 词：混凝土 超声检测 变分模态分解 本征模态函数 

分 类 号：TU528.1[建筑科学—建筑技术科学] TB9[一般工业技术—计量学]