中国激光, 2016, 43 (8): 0804001, 网络出版: 2016-08-10
基于关联维数的光纤布拉格光栅的冲击定位
Impact Localization by Using Fiber Bragg Grating Sensors Based on Correlation Dimension
测量 低速冲击定位 光纤布拉格光栅 关联维数 板结构 measurement impact localization with low speed fiber Bragg grating correlation dimension plate structure
摘要
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30 cm×30 cm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3.5 cm。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。
Abstract
Aiming at the requirement of low speed impact localization, a fiber Bragg grating (FBG) sensor network is constructed. Distribution of the correlation dimension as well as the distance between the impact point and the sensor are studied, taken the correlation dimension with the impact response signal time series as an impact characteristic. Based on this distribution, the impact load position is regionally identified; the coordinated localization conducted by tri-circle model is achieved. The wing box structure is divided into several areas, where the configuration of FBG sensors is optimized according to the algorithm characteristics. As a result, the impact monitoring system is built and the low speed impact test is carried on. The result shows that the ten testing random impact points on the 30 cm×30 cm wing box plate structure are all identified correctly with an average error of 3.5 cm. The impact load position identification using six FBG sensors is effectively realized in this method, providing a reference for combination of fractal theory with impact monitoring technology.
熊稚莉, 梁大开, 李彤韡, 史璐, 贾鸿宇. 基于关联维数的光纤布拉格光栅的冲击定位[J]. 中国激光, 2016, 43(8): 0804001. Xiong Zhili, Liang Dakai, Li Tongwei, Shi Lu, Jia Hongyu. Impact Localization by Using Fiber Bragg Grating Sensors Based on Correlation Dimension[J]. Chinese Journal of Lasers, 2016, 43(8): 0804001.