研究了一种基于压电传感器阵列和主动Lamb波的结构损伤成像方法,有助于克服Lamb波在板结构中、特别是在复合材料板结构中存在的频散、多种模式及模式转换的现象给结构健康监测带来的困难.分析了结构多损伤散射信号的时间反转聚焦原理,在此基础上提出了一种基于Shannon复数小波和时间反转聚焦的信号合成成像方法.该方法中,确定Lamb波响应信号的到达时刻是信号能够准确聚焦的关键因素之一.提出了利用Shannon复数小波变换计算Lamb波响应信号到达时刻的方法.在碳纤维复合材料板结构上对整套信号合成成像方法进行了验证.研究结果表明,该方法能够有效地对同一个监测区域中的多个损伤进行成像定位.相对于30cm×30cm的监测区域,定位误差不超过2cm.该方法有助于结构健康监测技术的工程应用.
A piezoelectric sensors array and active Lamb wave based structural damage imaging method was researched which was helpful to overcome the problems of damage monitoring with multi-mode and mode convention of Lamb wave propagation on plate-like structures,especially on those of composite materials.The principle of time reversal focusing of multi-damage scattering signals was analyzed.Based on this principle,a signal synthesis imaging method based on Shannon complex wavelet and time reversal focusing was proposed.In this method,calculation of time-of-arrival of Lamb wave response signals was an important issue to signal synthesis.A Shannon complex wavelet based time-of-arrival of Lamb wave response signals calculating method was proposed.The signal synthesis imaging method was validated on a carbon fiber composite plate.The result shows that this method could estimate the positions of multi-damages in the same monitoring area efficiently.Compared with the monitoring area of 30cm × 30cm,the damage localization errors are no more than 2cm.It can promote the practical applications of SHM technology.
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