| 基于小波包分析的声发射源定位方法 |
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| 引用本文： | 冯志刚,孙汝科,郭娟娟,江镅.基于小波包分析的声发射源定位方法[J].江苏大学学报(自然科学版),2010,31(1). |
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| 作者姓名： | 冯志刚 孙汝科 郭娟娟 江镅 |
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| 作者单位： | 江苏大学,理学院,江苏,镇江,212013 |
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| 基金项目： | 国家自然科学基金资助项目(10771088) |
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| 摘 要： | 通过用小波和小波包对声发射信号进行分解,研究了声发射信号的频散现象,探讨了频散现象与声发射源距传感器距离的关系.为消除声速测量偏差给声发射系统带来的定位误差,利用该关系和在薄板中传播的Lamb波的频散现象,提出了一种在不知道发射源声速的情况下进行声发射源定位的新方法,且不必增加传感器的数量.以铅笔芯折断产生信号为模拟源进行了试验验证.结果表明,该方法可以比较准确地确定声发射源的位置,而且理论值与实际值相差很小.
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| 关 键 词： | 声发射 小波分析 Lamb波 频散 定位 |
Acoustic emission source location technique based on wavelet packet analysis |
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| Feng Zhigang,Sun Ruke,Guo Juanjuan,Jiang Mei.Acoustic emission source location technique based on wavelet packet analysis[J].Journal of Jiangsu University:Natural Science Edition,2010,31(1). |
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| Authors: | Feng Zhigang Sun Ruke Guo Juanjuan Jiang Mei |
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| Institution: | Faculty of Science/a>;Jiangsu University/a>;Zhenjiang/a>;Jiangsu 212013/a>;China |
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| Abstract: | By using the wavelet and wavelet packet to decompose the acoustic emission(AE) signal,the dispersion characteristics were investigated and the relationships between dispersion and distance were derived.In order to eliminate the locating error for acoustic emission system due to the sonic speed measurement deviation,by using the relationships and the dispersion characteristics of Lamb waves,a new locating method was proposed,which could take effect when the sound velocity of acoustic emission was not certain... |
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| Keywords: | acoustic emissions wavelet analysis Lamb waves frequency dispersion source location |
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