| 张奇,韩庆邦,孙刘家,靳琪琳,王溢秋,刘志鹏.混凝土缺陷信号变分模态分解与超声成像方法*[J].,2024,43(4):829-835 |
| 混凝土缺陷信号变分模态分解与超声成像方法* |
| Variational mode decomposition of concrete defect single and ultrasonic imagine method |
| 投稿时间：2023-12-12 修订日期：2024-07-02 |
| 中文摘要: |
| 混凝土的强散射特性限制了其中缺陷声波成像的分辨率。本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。实验结果表明，该方法对于弱散射及散射干扰具有更好的鲁棒性，相比基于原始数据成像方法能够更好的还原混凝土内部结构。 |
| 英文摘要: |
| 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. |
| DOI：10.11684/j.issn.1000-310X.2024.04.015 |
| 中文关键词: 混凝土 超声检测 变分模态分解 本征模态函数 |
| 英文关键词: concrete ultrasonic testing variational mode decomposition intrinsic mode function |
| 基金项目:国家自然科学基金No12174085 |
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