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| 去除Lamb波频散的线性映射法 |
| On the linear mapping method for removing frequency dispersion of lamb wave |
| Received:April 19, 2017 Revised:June 20, 2017 |
| DOI：10.7520/1001-4888-17-096 |
| 中文关键词: Lamb波 频散 线性映射法 相控阵成像算法 损伤定位 |
| 英文关键词:Lamb wave frequency dispersion linear mapping method phased array imaging algorithm damage location |
| 基金项目:国家自然科学基金重点国际合作项目(11520101001)资助;江苏省重点研发计划-产业前瞻与共性关键技术(BE2015138)；镇江市重点研发计划-产业前瞻与共性关键技术(GY2015054) |
| Author Name | Affiliation | | LUO Ying* | Faculty of Civil Engineering and Mechanics, International Joint Research Center for Health Management on Key Structure of the High-End Equipment, Jiangsu University, Zhenjiang 212013, China | | XU Cai-jun | Faculty of Civil Engineering and Mechanics, International Joint Research Center for Health Management on Key Structure of the High-End Equipment, Jiangsu University, Zhenjiang 212013, China | | XU Chen-guang | Faculty of Civil Engineering and Mechanics, International Joint Research Center for Health Management on Key Structure of the High-End Equipment, Jiangsu University, Zhenjiang 212013, China | | XU Gui-dong | Faculty of Civil Engineering and Mechanics, International Joint Research Center for Health Management on Key Structure of the High-End Equipment, Jiangsu University, Zhenjiang 212013, China | | YANG Guo-ying | Faculty of Civil Engineering and Mechanics, International Joint Research Center for Health Management on Key Structure of the High-End Equipment, Jiangsu University, Zhenjiang 212013, China | | WANG Zi-ping | Faculty of Civil Engineering and Mechanics, International Joint Research Center for Health Management on Key Structure of the High-End Equipment, Jiangsu University, Zhenjiang 212013, China |
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| 中文摘要: |
| Lamb波常被用于板壳结构的无损检测，然而Lamb波的频散效应会导致板中损伤反射信号的渡越时间信息无法准确提取，因而影响损伤定位及成像的精度。本文引入线性映射方法，用线性频率-波数关系取代原有非线性的频散关系，从而去除激励中心频率附近的频散效应。分别采用数值模拟和实验的方法分析了频散去除的效果，进而结合相控阵成像算法对金属板中的损伤进行成像研究。结果表明,利用线性映射法去除频散可以显著提高含损伤散射信号的信噪比，提升相控阵损伤成像方法对损伤定位的准确性。 |
| 英文摘要: |
| Lamb wave is often used in plate and shell structure non-destructive examination (NDE). However, the frequency dispersion effect of Lamb wave can cause the reflected signal transit time information from the damage in plate can not be accurately extracted, thus affecting the damage locating and imaging accuracy. In this paper, introducing linear mapping method, the original nonlinear frequency dispersion relation is replaced by linear frequency wave number relation, thus the frequency dispersion effect near the excitation centre is removed. The effect of frequency dispersion removal is analyzed by numerical simulation and experimental method respectively, and then the imaging accuracy of damage in metal plate is studied by phased array imaging algorithm. Results show that using linear mapping method to remove frequency dispersion can remarkably improve the signal to noise ratio of damage scattering signals, and promote damage locating accuracy of phased array damage imaging method. |
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