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为了提高算法在近场冲击源的定位精度,提出了基于多重信号分类(MUSIC)算法的复合材料近场冲击源定位方法。首先通过Fresnel近似将一维远场模型扩展到二维近场模型;接着应用Gabor小波变换从冲击的宽带信号中提取某一中心频率的窄带波;最后应用二维近场MUSIC算法,扫描整个监测区域,可以同时得到冲击源的距离和方位角。复合材料层合板的冲击实验结果表明该方法能够精确有效地对冲击源进行定位,距离的定位误差不超过0.94cm,方位角误差不超过1°。
In order to improve the positioning accuracy of the near-field impact source, a method of locating the near-field impact source of composite material based on multiple signal classification (MUSIC) algorithm is proposed. Firstly, the one-dimensional far-field model is extended to a two-dimensional near-field model by Fresnel approximation. Then a Gabor wavelet transform is used to extract a narrow-band wave of a center frequency from the impacted broadband signal. Finally, a 2D near-field MUSIC algorithm is used to scan the entire monitoring Area, you can get the impact of the source distance and azimuth. The experimental results of the impact on the composite laminates show that the method can accurately and effectively locate the impact source, the positioning error of the distance does not exceed 0.94cm and the azimuth error does not exceed 1 °.