基于互相关分析的桥梁应变传感器故障诊断  

Failure Diagnosis of Bridge Strain Sensor Based on the Cross-correlation Analysis

作　　者：刘张浩 秦小平[1,3] 李力[1,2] 易航宇 刘怀林 LIU Zhanghao;QIN Xiaoping;LI Li;YI Hangyu;LIU Huailin(China Merchants Chongqing Communications Technology Research&Design Institute Co.,Ltd.,Chongqing 400067;Chongqing Wukang Technology Co.,Ltd.,Chongqing 404100;State Key Laboratory of Bridge Engineering Structural Dynamics,Chongqing 400067)

机构地区：[1]招商局重庆交通科研设计院有限公司,重庆400067 [2]重庆物康科技有限公司,重庆404100 [3]桥梁工程结构动力学国家重点实验室,重庆400067

出　　处：《公路交通技术》2022年第4期77-83,共7页Technology of Highway and Transport

基　　金：国家重点研发计划项目(2020YFF0217801);重庆市建设科技计划项目(城科字2021第5-10)。

摘　　要：建立快速、高效的传感器故障诊断技术能最大程度保障采集数据的可靠性,现有诊断技术多基于神经网络方法,虽然该法故障诊断误差小,但需要提取大量训练样本且模型构建复杂、计算时间长,增加了在桥梁监测中大规模推广应用难度大。因此利用统计数据方法对常见故障下关联传感器互相关系数进行研究,提出了基于互相关分析方法的传感器故诊断理论和算法,可快速诊断传感器故障及常见故障识别,并分析了不同故障下的精度。结果表明:基于互相关分析方法在传感器故障诊断方面有很好的精度,可完全识别常值故障、信噪比小于22.5的精度下降故障、大于6με的固定偏差故障和漂移速率大于0.03με/10 min的漂移故障。在故障定位分析时,随着传感器误差的增加,故障定位误差越小。Establishing a fast and efficient sensor failure diagnosis technology can guarantee the reliability of the collected data to the greatest extent.Existing diagnosis technologies are mostly based on neural network methods.Although the failure diagnosis error is small,it needs to extract a large number of training samples and the model construction is complicated and the calculation time is long,which increases the difficulty and cost of large-scale application in bridge monitoring.Therefore,this paper uses statistical data method to study the correlation number of associated sensors under common failures,and proposes sensor failure diagnosis theory and algorithms based on cross-correlation analysis method,which can quickly diagnose sensor failures and identify common failures,and analyze the accuracy of different failures.The results show that the cross-correlation analysis method has good accuracy,including constant failures(complete recognition),precision reduction(signal-to-noise ratio<22.5),fixed deviation(deviation>6με)and linear deviation(drift rate>0.03με/10 min).During failures location analysis,as the sensor error increases,the failures positioning error of the fault is smaller.

关 键 词：互相关分析 应变传感器 故障诊断 识别精度 

分 类 号：U446.2[建筑科学—桥梁与隧道工程]