基于导波频散特征的超声导波模态识别方法

doi:10.3901/JME.2017.18.010

机械工程学报 ›› 2017, Vol. 53 ›› Issue (18): 10-17.doi: 10.3901/JME.2017.18.010

基于导波频散特征的超声导波模态识别方法

伍文君¹, 章林柯¹, 王悦民²

1. 武汉理工大学能源与动力工程学院武汉 430063;
2. 海军工程大学动力工程学院武汉 430033

收稿日期:2017-01-02 修回日期:2017-05-30 出版日期:2017-09-20 发布日期:2017-09-20
通讯作者: 章林柯(通信作者),男,1977年出生,博士,副教授.主要研究方向为噪声与振动的监测、诊断及控制.E-mail:lincol_zhang@126.com
作者简介:伍文君,男,1982年出生,博士,讲师.主要研究方向为超声导波检测和振动噪声分析与控制.E-mail:wuwenjun@whut.edu.cn
基金资助:
国家自然科学基金（51205404，51709216）、国防预研基金（9140A27020115JB11001）和湖北省自然科学基金（2016CKB700）资助项目。

Dispersion-based Mode Identification of Ultrasonic Guided Waves

WU Wenjun¹, ZHANG Linke¹, WANG Yuemin²

1. School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063;
2. College of Power Engineering, Naval University of Engineering, Wuhan 430033

Received:2017-01-02 Revised:2017-05-30 Online:2017-09-20 Published:2017-09-20

摘要/Abstract

摘要： 针对超声导波检测应用中模态识别难的问题，提出一种基于导波频散特征的模态识别方法。通过估计导波信号的频散量来识别导波模态，而导波的频散量与该模态导波波数在激励频率处的二次泰勒展开系数有关。根据导波信号的频散特点，构造带时间斜变的Chirplet匹配原子库，基于该Chirplet原子库，对导波信号进行匹配追踪分解，并算得该导波信号波数在激励频率处二次泰勒展开系数的最优估计值，再根据预先算得的各模态导波的波数-频率频散关系，区分导波信号的不同模态。数值模拟和试验验证都表明，该导波模态识别方法是准确且有效的。而该方法的不足之处是尚不能识别混叠严重的导波信号。研究结果有助于提高人们对复杂导波检测信号的解析能力，并推动导波检测技术的推广应用。

关键词: 超声导波, 模态识别, 匹配追踪, 频散

Abstract: Mode identification of ultrasonic guided waves, which is always encountered in guided wave inspections, is a difficult problem. A dispersion-based mode identification approach is introduced, which distinguishes guided wave modes by their degree of dispersion. The degree of dispersion of some mode is found related with the second coefficient of Taylor expansion of this mode's wave number at the excitation frequency. Based on this dispersion feature of guided waves, a Chirplet dictionary with the time shear is designed. And then the guided wave signals are analyzed with the matching pursuit method based on this Chirplet dictionary. The optimal estimation of the second coefficient of Taylor expansion of wave number can be obtained by the matching pursuit method, and combined with the wavenumber-frequency dispersion relation calculated in advance, the guided wave modes can be recognized. The numerical simulation and experimental verification all show that the proposed mode identification method is effectively and correctly. The deficiency of this method is that it still cannot distinguish the severely overlapped guided wave modes. The study results help to improve the interpretation of complicated guided wave inspection signals, and generalize the application of guided wave inspection.

Key words: dispersion, matching pursuit, mode identification, ultrasonic guided wave

中图分类号:

TH112
TP24

伍文君, 章林柯, 王悦民. 基于导波频散特征的超声导波模态识别方法[J]. 机械工程学报, 2017, 53(18): 10-17.

WU Wenjun, ZHANG Linke, WANG Yuemin. Dispersion-based Mode Identification of Ultrasonic Guided Waves[J]. Journal of Mechanical Engineering, 2017, 53(18): 10-17.

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基于导波频散特征的超声导波模态识别方法

Dispersion-based Mode Identification of Ultrasonic Guided Waves

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