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针对板结构低速冲击定位需求,通过构建分布式光纤布拉格光栅(FBG)传感网络,并以光纤光栅传感器感知的冲击响应信号时间序列的关联维数作为冲击特征量,研究了关联维数与冲击点和传感器之间距离的分布规律。基于此分布规律,对冲击载荷位置进行了区域辨识,采用三圆取交的冲击定位算法实现了对冲击载荷位置的坐标定位。对机翼盒段结构划分区域,根据算法特点优化传感器排布,搭建冲击载荷监测实验系统,并进行低速冲击载荷实验。实验结果表明,在30cm×30cm的机翼盒段板结构上随机选取10个测试点进行低速冲击定位识别,实现了所有冲击实验点区域辨识,其正确率高达100%,坐标定位的平均误差为3.5cm。该方法利用了6个光纤布拉格光栅传感器能够有效地实现对冲击载荷位置辨识,对实现分形维数与冲击监测技术相结合具有一定意义。
Aimed at the demand of low-speed impact positioning of plate structure, by constructing distributed fiber Bragg grating (FBG) sensing network and taking the correlation dimension of impulse response signal time series perceived by fiber grating sensor as impact characteristic quantity, the relationship between correlation dimension and impact The distribution of the distance between the point and the sensor. Based on this distribution rule, the location of impact load is identified by region. The impact positioning algorithm of three circles is adopted to realize the coordinate location of impact load. According to the characteristics of the algorithm, the sensor arrangement is optimized and the impact load monitoring experimental system is set up, and the low-speed impact load test is carried out. Experimental results show that 10 test points randomly selected from 30cm × 30cm wing box sections can be identified by low-velocity impact. The recognition of all impact test points is achieved with the accuracy of up to 100%. The average error of coordinate positioning is 3.5cm. The method utilizes six fiber Bragg grating sensors to effectively identify the position of impact load, and has some significance to realize the combination of fractal dimension and impact monitoring technology.