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中文摘要：
主动Lamb波损伤成像监测技术是结构健康监测研究的热点之一。受到Lamb波频散及多模特性的限制，窄带信号成为主动Lamb波健康监测技术中最常用的激励信号。而窄带激励下的结构响应信号容易发生波包混叠现象，影响监测信号质量；且较宽的波包脉宽降低了损伤成像的分辨率。针对这些问题，在分析Lamb波传播基本原理基础上，研究提出波包重建方法，首先提取响应信号的传递函数，再采用窄脉宽波包重建响应信号，以提高监测信号质量以及损伤成像的分辨率和精度。在环氧玻璃纤维板上的实验结果表明，该方法可有效消除监测信号中的波包混叠现象，提高主动Lamb波损伤成像的准确性。
英文摘要：
Active Lamb wave damage detection and imaging method is one of the emphases in the structural health monitoring investigation. Due to the dispersion and multi-modes, narrow-band excitation is used mostly in the active Lamb wave based struc- tural monitoring method. However, wave superposition usually happens in the structural responses during the monitoring. It infects the quality of the signals. At the same time, wide width of the wave debases the resolution of the damage imaging. Wave rebuilding method is presented in this article to resolve these problems based on the analysis of the Lamb wave propagation. Transfer function is solved firstly, and a narrow width wave is used to rebuild the signals. Experiments on glass fiber epoxy board demonstrated that this method can eliminate the wave superposition in the monitoring signals, and improve the precision of the damage imaging.
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