Page 101 - 无损检测2024年第八期

试验研究
试验研究

DOI：10.11973/wsjc202408011

基于 MUSIC 算法特征值损伤因子的板状结构

损伤程度评估

阎 石，朱瑞峰
（沈阳建筑大学 土木工程学院，沈阳 110168）

摘 要：研究了多重信号分类（MUSIC）算法在板状结构损伤检测中的应用，提出一种基于
MUSIC算法特征值的损伤因子，为基于MUSIC算法的板状结构损伤成像技术提供了一种可靠的
损伤程度评估理论。首先利用MUSIC算法计算的高精度特征值和Lamb波损伤散射信号幅值的相
关性，采用Abaqus有限元仿真软件模拟不同程度的损伤，将板状结构中的损伤成像定位之后，根据
散射信号将结构损伤程度转化为特征值变化量，根据特征值计算损伤因子，建立损伤评估模型预测
损伤程度，并通过试验验证其正确性。试验结果表明，在合适的激励频率下，特征值损伤因子随着
损伤程度的增加呈现出线性变化，能较好地反映损伤程度；该方法具有较高的准确性和稳定性，在
一定损伤程度内能够有效地反映结构损伤程度。
关键词：MUSIC算法；特征值；损伤因子；有限元；损伤程度
中图分类号：TU395；TG115.28 文献标志码：A 文章编号：1000-6656(2024)08-0063-07

Damage level evaluation of plate-like structures based on MUSIC algorithm
eigenvalue damage factor

YAN Shi, ZHU Ruifeng
（School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China）

Abstract: The application of MUSIC algorithm in plate-like structures was investigated, and a damage factor based
on the characteristic value of the MUSIC algorithm was proposed, which provided a reliable damage level assessment
theory for plate-like structure damage imaging technology based on the MUSIC algorithm. The correlation between high-

precision eigenvalues calculated by the MUSIC algorithm and amplitudes of Lamb wave damage scattering signal was
used. The various damage levels were simulated by using the Abaqus finite element software. After the damage was
imaged and localized in the plate-like structure, the structural damage level was transformed into the amount of eigenvalue
change according to the scattering signal amplitudes, and the damage factor was calculated according to the eigenvalues.
A damage evaluation model was established to predict the damage level and the correctness of the model was verified
through experiments. Experimental results showed the proposed eigenvalue-based damage factor responded well to the
damage level as the damage level increased linearly with the increase of the eigenvalue damage factor under the appropriate
excitation frequency. The method, which can effectively reflect the structural damage level within a certain range, had high
accuracy and stability, improving the structural damage detection technology based on the MUSIC algorithm.
Key words: MUSIC algorithm; eigenvalue; damage factor; finite element; damage level

收稿日期：2024-01-02 板状结构具有结构简单、稳定性高、承载能力强
基金项目：国家自然科学基金（51278313）
等优点，已经被广泛应用于船舶、航空航天、金属包
作者简介：阎 石（1962—），男，博士，教授，博士生导师，主要
装、交通运输、土木工程等领域 [1-2] 。板状结构在长
研究方向为结构健康监测
期使用过程中，不可避免地会产生不可逆转的损伤，
通信作者：朱瑞峰，Zhuruifeng@stu.sjzu.edu.cn
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2024 年 第 46 卷 第 8 期
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