| 含缺陷管道超声导波检测信号的相关性分析 |
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| 引用本文： | 张伟伟,王志华,马宏伟. 含缺陷管道超声导波检测信号的相关性分析[J]. 暨南大学学报(自然科学与医学版), 2009, 30(3) |
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| 作者姓名： | 张伟伟 王志华 马宏伟 |
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| 作者单位： | 1. 暨南大学理工学院"重大工程灾害与控制"教育部重点实验室,广东,广州,510632
2. 太原理工大学应力所,山西,太原,030024;北京理工大学爆炸科学与技术国家重点实验室,北京,100081 |
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| 基金项目： | 国家自然科学基金项目，广东省科技攻关项目，广东省高校自然科学重点研究项目 |
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| 摘 要： | 提出一种基于相关性分析的管道缺陷检测方法.该方法通过截取入射信号作为主动检测信号,将实测信号作为被检测信号.借助于合适的窗函数计算检测信号和不同时刻测试信号的相关系数,通过相关系数的峰值点判断波到时刻.从而提高识别精度.为了消除来源于模式转换和噪声的杂波信号,设置阈值可达到滤波效果.利用该方法,对单位置腐蚀和双位置腐蚀,在不同噪声水平下的测试信号进行相关性分析.结果表明,阈值法可以较好地抑制噪声和模式转换对识别结果的影响,且具有较高的识别精度.该方法原理简单,操作简便,可用于管道腐蚀检测的在线检测.
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| 关 键 词： | 管道 超声导波 相关性 损伤检测 |
Signal correlation analysis of ultrasonic guided wave in damaged pipe |
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| ZHANG Wei-wei,WANG Zhi-hua,MA Hong-wei. Signal correlation analysis of ultrasonic guided wave in damaged pipe[J]. Journal of Jinan University(Natural Science & Medicine Edition), 2009, 30(3) |
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| Authors: | ZHANG Wei-wei WANG Zhi-hua MA Hong-wei |
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| Affiliation: | 1.College of Science & Engineering;The Key Laboratory of Disaster Forecast and Control in Engineering;Ministry of Education of China;Jinan University;Guangzhou 510632;China;2.Institute of Mechanics;Taiyuan University of technology;Taiyuan Shanxi 030024;3.State Key Laboratory of Explosion Science and Technology;Beijing Institute of Technology;Beijing 100081;China |
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| Abstract: | In this paper,it is suggested that the scheme of corrosion detection in a pipe based on correlation coefficients.In this scheme,the incident signal is defined as the active detected signal(ADS),while the measurements signal is treated as the passive detection signal(PDS).The correlation coefficients between ADS and PDS at different time are calculated with the help of a window function,from which the arriving time of the echo by the damage could be determined.A suitable threshold is proposed to reduce the i... |
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| Keywords: | pipe ultrasonic guided wave correlation damage detection |
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