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| 基于小波分析的超声导波管道裂纹检测方法研究 | |
| 引用本文： | 宋振华,王志华,马宏伟.基于小波分析的超声导波管道裂纹检测方法研究[J].固体力学学报,2009,30(4). |
| 作者姓名： | 宋振华 王志华 马宏伟 |
| 作者单位： | 1. 暨南大学理工学院,广州,510632 2. 太原理工大学应用力学与生物医学工程研究所,太原,030024 3. 暨南大学理工学院,广州,510632;暨甫大学重大工程灾害与控制教育部实验室,广州,510632 |
| 基金项目： | 国家自然科学基金项目 |
| 摘 要： | 利用LS-DYNA970动态有限元分析软件对考虑横应变下的管道纵向超声导波损伤检测进行了数值模拟,分析了不同的激发频率对管道中导波频散现象的影响.选择适当的尺度和小波基函数,利用小波变换实现了对微弱且无法直接观测的缺陷检测信号的识别.同时通过时频分析研究了噪声信号在检测信号中的分布规律,并运用小波包分解和重构算法将信噪分离,实现高噪条件下管道微缺陷的损伤识别. |
| 关 键 词： | 管道 频散 损伤检测 小波变换 小波分解和重构 |
STUDY ON WAVELET-BASED CRACK DETECTION IN PIPES USING ULTRASONIC LONGITUDINAL GUIDED-WAVE |
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| Zhenhua Song,Zhihua Wang,Hongwei Ma.STUDY ON WAVELET-BASED CRACK DETECTION IN PIPES USING ULTRASONIC LONGITUDINAL GUIDED-WAVE[J].Acta Mechnica Solida Sinica,2009,30(4). | |
| Authors: | Zhenhua Song Zhihua Wang Hongwei Ma |
| Institution: | 1College of Science & Engineering;Jinan University;Guangzhou;510632;2Institute of Applied Mechanics;Taiyuan University of technology;Taiyuan;030024;3Key Laboratory of Disaster Forecast and Control in Engineering;Ministry of Education of People's Republicof China;510632 |
| Abstract: | Using the LS-DYNA970 dynamic commercial finite element program,the numerical simulations of the transonic longitudinal guided-wave in cracked pipes are conducted,in which the effect of transverse strains has been taken into consideration.The influence of the excitation frequency on the frequency dispersion of guided waves is analyzed.By choosing proper scale and basic functions of wavelets,the weak signals of defect detection are identified,which cannot be observed directly.Meanwhile,the distribution of the... |
| Keywords: | pipe frequency dispersion damage detection wavelet transform wavelet decomposition and reconstruction |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |