基于MUSIC算法的复合材料近场冲击源定位  

MUSIC algorithm based impact localization in the near-field of composite structure

作　　者：钟永腾[1] 袁慎芳[1] 

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室,南京210016

出　　处：《复合材料学报》2013年第2期189-194,共6页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金重点项目(50830201);高校博士学科点专项科研基金(20103218110005);长江学者和创新团队发展计划资助(IRT0968);国家杰出青年科学基金(51225502)

摘　　要：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°。To improve the location precision of foreign object impact in the near-field,the multiple signal classification（MUSIC） based localization algorithm was presented for the impacts estimating.Firstly,classical far-field MUSIC algorithm was extended to near-field version using the Fresnel approximation.Then Gabor transform was applied to extract the narrow-band signal at a center frequency from the impact signal.After scanning over the whole interest direction of the structure,the signal source parameters including range and direction from the peak of spatial spectrum were obtained.The experiment on the epoxy laminates plate was established to verify the validity of the proposed method.Results show that the distance error and the direction error are less than 0.94 cm and 1o,respectively.

关 键 词：低速冲击 定位 多重信号分类(MUSIC) 复合材料 近场 

分 类 号：TB330.1[一般工业技术—材料科学与工程]