• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2024, Vol. 60 ›› Issue (4): 250-258.doi: 10.3901/JME.2024.04.250

• 仪器科学与技术 • 上一篇    下一篇

扫码分享

基于导波基函数投影变换的单模态超声导波提取方法

王小丫1, 王鉴1, 秦鹏2, 韩星程1, 聂鹏飞2, 韩焱2   

  1. 1. 中北大学信息探测与处理山西省重点实验室 太原 030051;
    2. 中北大学山西省现代无损检测工程技术研究中心 太原 030051
  • 收稿日期:2023-04-03 修回日期:2023-11-08 出版日期:2024-02-20 发布日期:2024-05-25
  • 通讯作者: 韩焱,男,1957年出生,教授,博士研究生导师。主要研究方向为无损检测、探测与成像、信息处理和识别、动态测试。E-mail:hanyan@nuc.edu.cn
  • 作者简介:王小丫,女,2000年出生。主要研究方向为超声导波成像。E-mail:1270568879@qq.com
  • 基金资助:
    国家自然科学青年基金(62203405); 山西省应用基础研究计划(20210302124545)资助项目

Single-mode Ultrasonic Guided Wave Extraction Method Based on Guided Wave Basis Function Projection Transformation

WANG Xiaoya1, WANG Jian1, QIN Peng2, HAN Xingcheng1, NIE Pengfei2, HAN Yan2   

  1. 1. Shanxi Key Laboratory of Signal Capturing&Processing, North University of China, Taiyuan 030051;
    2. Shanxi Research Center of Modern NDT Engineering Technology, North University of China, Taiyuan 030051
  • Received:2023-04-03 Revised:2023-11-08 Online:2024-02-20 Published:2024-05-25

摘要: 由于超声导波的多模态特性和频散特性,实际检测时在同一激发频率下存在多种模态的混合信号,影响导波检测的灵敏度。针对上述存在的问题,在建立导波频散信号的数学模型的基础上,提出一种基于导波基函数投影变换的单模态超声导波提取方法。首先根据频散传递函数建立各模态导波信号的数学模型,将各模态导波信号构建为一组导波模态基,之后,以模态基函数为投影变换核,对接收信号进行投影变换,从而实现多模态混叠信号中单模态导波信号的提取。通过对板中的Lamb波S0A0A1混合模态仿真和实际信号处理试验表明,提出的方法无需频散补偿即可实现多模态混叠信号中单模态导波信号的有效提取。

关键词: 导波, 导波基, 投影变换, 模态提取

Abstract: A method is proposed to address the multimodal and dispersive nature of ultrasonic guided waves in practical detection scenarios, where mixed signals with various modes are present at the same excitation frequency, affecting the sensitivity of guided wave detection. Based on the mathematical modeling of guided wave dispersion signals, a single-mode ultrasonic guided wave extraction method is introduced using guided wave basis function projection transformation. Initially, mathematical models for each modal guided wave signal are established using the dispersion transfer function. These modal guided wave signals are then formulated into a set of guided wave mode bases. Subsequently, employing the mode basis functions as the projection transformation kernel, the received signals undergo a projection transformation, enabling the effective extraction of single-mode guided wave signals from the superimposed multimodal signals without the need for dispersion compensation. Simulation and experimental signal processing involving Lamb waves and mixed modes on a plate demonstrate the efficacy of the proposed method in achieving the extraction of single-mode guided wave signals without requiring additional dispersion compensation steps, thereby simplifying the ultrasonic guided wave detection process and enhancing sensitivity to guided wave signals.

Key words: guided waves, guided wave group, projection transformation, model extraction

中图分类号: