基于RSSI加权质心的光纤光栅传感网络冲击定位

针对材料结构损伤位置识别的精确定位问题,通过构建分布式光纤布拉格光栅(FBG)传感网络,利用光纤光栅传感器的传感特性,根据感知的冲击响应信号强度(RSSI)以及冲击点到传感器距离的关系,提出一种基于RSSI加权质心的光纤光栅传感网络冲击载荷定位方法。设计合理的传感器网络监测布局,通过分析不同位置传感器感知的冲击响应信号强度辨识冲击点所在的区域,采用加权质心定位算法对冲击载荷的位置识别定位。试验表明:分别构建基于碳纤维复合材料结构板、钢板、木板损伤识别模式的定位监测实验系统,在300mm×300mm的监测区域内随机选取24个冲击点进行位置识别,能准确辨识所有实验冲击点所在的区域,并根据RSSI来确定冲击点的位置坐标,坐标定位的平均误差在15mm以内,可实现对冲击点位置的识别,为准确识别材料结构的损伤位置提供了一种实用可行的方法。

Impact localization of FBG sensor networks based onRSSI weighted centroid

Aiming at the problem of precise positioning of material structure damage location identification,a distributed fiber Bragg grating (FBG) sensing network is constructed,using the sensing characteristics of fiber grating sensors,based on the perceived impact response signal strength (RSSI) and the distance from the impact point to the sensor.In this paper,a method for locating impact load based on RSSI weighted centroid for fiber grating sensor network is proposed.Design a reasonable sensor network monitoring layout,identify the area where the impact point is located by analyzing the intensity of the impact response signal sensed by different position sensors,and use the weighted centroid location algorithm to identify and locate the impact load location.Test showed that build respectively based on the carbon fiber composite materials plate,steel plate,board structure damage identification model of positioning monitoring experiment system,in 300mm×300mm of monitoring area randomly selected 24 impact point is used to identify the location,can accurately identify all the impact point area,and according to the RSSI determines the location of the impact point coordinates. The average error of the coordinate positioning is within 15mm,which can realize the identification of the impact point position,and provides a practical and feasible method for accurately identifying the damage location of the material structure.