CAJ | 학술논문

在分析相控阵波束指向的控制过程与介绍相控阵结构健康监测原理的基础上，利用相控阵原理控制Lamb波的时间延迟使其在结构损伤处聚焦。通过比较结构健康状态与损伤状态的传感器响应信号，获取Lamb波损伤散射信号；采用相控阵技术控制损伤散射信号时间延迟得到不同方向的信号，进而实现对结构的多方位扫描，根据扫描信号特点，将各方向的监测结果信号采用灰度图像显示。该方法在铝板结构中实现损伤的定位成像，其不仅能够精确定位损伤位置，而且能够直观清晰显示结构损伤。
재분석상공진파속지향적공제과정여개소상공진결구건강감측원리적기출상，이용상공진원리공제Lamb파적시간연지사기재결구손상처취초。통과비교결구건강상태여손상상태적전감기향응신호，획취Lamb파손상산사신호；채용상공진기술공제손상산사신호시간연지득도불동방향적신호，진이실현대결구적다방위소묘，근거소묘신호특점，장각방향적감측결과신호채용회도도상현시。해방법재려판결구중실현손상적정위성상，기불부능구정학정위손상위치，이차능구직관청석현시결구손상。
The phased array beam steering is controlled and the Lamb wave phased array theory is discussed in de-tail.Phased array technology is used to control the time delay of the Lamb wave and to make the Lamb wave focus on the structure damage. The damage scattered signal is extracted by comparing the health signal and the damage signal.The Lamb wave signal direction is controlled by utilizing the time delay to the excitation signals and the dam-age scattered signals and the structure is monitored in all orientations. The processed signals are shown on the mapped image in gray-scale. The gray-scale in the mapped image from dark to light corresponds to the amplitude from low to high.The location where the max amplitude of the signals lie is the damage location in the structure.Fi-nally,the proposed method is verified by an experiment on aluminum sheet structure and the result shows that it is effective to identify the damage position of structure and to display the damage clearly.