基于梅花阵列的复合材料全方位冲击定位方法

针对一维线性传感器阵列的盲区问题,研究了基于梅花阵列的二维多重信号分类(2D-MUSIC)冲击定位方法。梅花阵列的布置方式是在圆心处布置1个PZT传感器,另外在半径为 R 的圆周上均匀布置 M 个PZT传感器,首先联合冲击信号传播到参考阵元PZT0和第1个接收阵元PZT1的时间信息估计冲击信号的Lamb波传播波速;然后利用近场2D-MUSIC算法实现冲击源的距离和角度的同时定位;最后,在玻璃纤维复合材料层合板中进行了冲击定位方法的验证。实验结果表明: 基于梅花阵列的方法能够对0°~360°的冲击源进行精确地定位,定位结果精度较高,其中最大距离误差为2.2 cm,最大角度误差为5°。

Omni-directional impact localization method on composite structure using plum blossom array

Aiming at the problem of blind area using uniform linear array, impact localization method of 2D multiple signal classification (2D-MUSIC) using plum blossom array was investigated.The layout of plum blossom array consisted of one sensor in the center and M sensors uniformly spaced on circle with the radius R .First, the velocity of Lamb wave propagating was estimated by the time information of impact signal acquired by reference array element PZT0 and array element PZT1 which received impact signal firstly.Second, near-field 2D-MUSIC algorithm was applied to localize the distance and direction of impact source simultaneously.Finally, the experiment on the glass fiber composite laminates was established to verify the validity of the impact localization method.Experimental results show that plum blossom array based impact localization method could localize impact source from 0° to 360° accurately, whose maximum error of distance and direction error is 2.2 cm and 5° respectively.