基于数据模板匹配算法的FBG冲击定位系统

利用光纤Bragg光栅(FBG)构建传感网络,结合其频谱特性和数据模板匹配处理方法,对碳纤维复合材料(CFRP)板低速冲击区域定位进行了研究。对同一测点进行等能量两次冲击,结果表明,同一测点的两次冲击信号幅频特性之间具有高度相似度。改变冲击位置,观测冲击位置与信号特征之间的关系。依据冲击信号幅频特性,构建低速冲击数据模板库。采用数据模板匹配算法,寻找最大相似度,实现冲击位置识别。实验结果表明,在500mm×500mm×2mm的CFRP板上对任意10个待测点进行低速冲击试验,均实现了准确定位,区域定位精度为80mm×80mm。研究结果为CFRP板的冲击定位检测提供了一种可靠的方法。

An impact location method using FBG sensing based on data template matching algorithm

The identification system of impact location is constructed by a fibe r Bragg grating (FBG)sensor network,and the spectrum characteristics analysis and data template matching algorithm are used to identify the impact location.The impact signal characteristic extraction method is used to impact the same position tw ice under the same energy,and the analysis shows that the two impact signal amplitude frequency characteristics are highly similar.The relati onship between impact location and signal characteristics is obtained by changing impact position,and the identification m ethod of low v elocity impact area location based on extracting impact signal amplitude frequency characteristics is proposed.Using the extracted impa ct sample amplitude frequency characteristics,the low velocity impact data templ ate library is built,and then using data template matching algorithm,the maximum similarity is searched to achieve identification of impact location.The results show that for arbitrary 10impact points on the 500mm×500mm×2mm carbon fiber reinforced plastics plate under test,the system can realize accu rate identification of impact location,and the regional location accuracy is 80mm ×80mm.The research results provide a scientific and reliable method for the i dentification of impact location of the carbon fiber composite material plate.