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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2.2cm,最大角度误差为5°。
To solve the blind area problem of one-dimensional linear sensor array, a two-dimensional multi-signal classification (2D-MUSIC) impact location method based on plum blossom array is studied. The plum blossom array is arranged by arranging one PZT sensor at the center of circle and arranging M PZT sensors evenly on the circle with radius R, and the time when the impact signal propagates to the reference cell PZT0 and the first receiving cell PZT1 Information is used to estimate the Lamb wave propagation velocity of the impact signal. Then the near-field 2D-MUSIC algorithm is used to locate the distance and angle of the impact source simultaneously. Finally, the impact localization method is validated in the glass fiber composite laminates. The experimental results show that the Plum array method can accurately locate the impact source from 0 ° to 360 °, and the positioning accuracy is high. The maximum distance error is 2.2 cm and the maximum angle error is 5 °.