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中文摘要：
对基于压电阵列的主动Lamb波结构健康监测技术进行了研究。分析了主动Lamb波损伤监测过程中损伤散射信号的特点,在已有研究成果基础上,研究提出合成波阵面损伤成像方法。利用压电阵列合成激励波阵面实现对Lamb波损伤散射信号的相干增强,给出了基本原理和实现技术;结合时间反转理论,给出了基于合成波阵面激励的损伤成像监测方法;在复合材料板结构上进行了实验研究,并与传统的单一压电片激励方法进行了分析和对比,实验结果表明,合成波阵面损伤成像监测方法能够有效提高Lamb波损伤散射信号的能量和监测的质量,增强抗干扰能力,同时对该方法存在的问题和解决办法进行了简单分析。
英文摘要：
Active Lamb wave structural health monitoring technique is studied based on PZT array.The features of damage scattering signal in active Lamb wave damage monitoring are analyzed.Based on existing research achievements,synthetic Lamb wave wavefront is studied and its damage imaging method is proposed to coherently enhance the damage scattering signals.The basic principle and implementation technique are given.Using time reversal theory,a damage imaging method is presented.Experimental research was carried out on a composite plate,and the proposed method was compared with traditional single PZT actuating method.Experimental results show that the synthetic wavefront damage imaging method can effectively improve the energy of Lamb wave damage scattering signal and the monitoring quality,and also can enhance the immunity to noises.At the same time,the existing problems and their solutions of the proposed method are briefly analyzed.
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