摘要
位移监测是结构健康监测最基础、最常规的任务之一。针对桥梁、隧道等长大线状结构形变监测,基于相机组网的位移传递测量是有效手段,但随着相机测站数量的增加,提点误差、模型简化等因素会导致相机网络的误差传递与累积,从而使得测量方程的病态程度增加,如何有效地抑制相机网络误差累积效应是该方法的关键问题之一。为此,本文对相机组网测量误差传递机理进行了系统分析,并提出一种基于误差系数的位移传递测量误差抑制方法,通过误差系数可以对网络测量误差直接进行表征。根据所构建的理论模型,优先在控制点处布置相机测站,尽可能在相机测站处增加标志点,并尽可能在相机测站间多布设标志点,以优化相机网络构型、提高测量精度,并在大跨度斜拉桥上对误差抑制方法进行了现场验证。结果表明,通过优化网络构型,相机网络的传递误差最高可被抑制79.19%。该研究可为相机组网测量在实际工程特别是长大线状结构形变测量中的应用提供有效的累积误差抑制和网络构型优化手段。
Objective With the rapid development of construction and operation scale of infrastructure such as bridges and tunnels,structural safety is becoming increasingly important.Structural health monitoring is a vital issue in structural safety,operation,and maintenance.Displacement monitoring is one of the most fundamental and routine tasks in structural health monitoring.Among various displacement measurement methods,the contact displacement measurement method is conceptually straightforward to implement.However,it requires specific environmental conditions for accurate measurements.The non-contact displacement measurement methods(e.g.,level gauges and total stations)have widespread applications in engineering.However,they cannot satisfy the measurement requirement of long-span structures due to the large-scale range and high accuracy requirements.For deformation monitoring of long linear structures like bridges and tunnels,the displacement-relay series camera network method has been proven to be effective.With the increasing number of camera stations,the accumulated error can be caused due to uncertain factors such as feature extraction errors and model simplifications.It is a challenge to reduce the accumulated error of the camera network.Hence,this study aims to suppress the accumulated error effect,consequently enhancing the measurement accuracy of the camera network.Methods We first conduct the theoretical analysis to demonstrate the solution conditions for the displacement-relay series camera network method.Before the simulation study,the basic network configuration is defined.Then,the accumulated error effect of the camera network is investigated through numerical simulations.According to the simulation results,we propose a method based on error coefficients to reduce the accumulated error of the camera network.The error coefficient consists of the condition number of the measurement matrix and the station number of the network.Finally,we provide a direct characterization of network measurement errors to enabl
作者
张跃强
陈铭杰
胡彪
陈文均
尹义贺
于起峰
刘肖琳
Zhang Yueqiang;Chen Mingjie;Hu Biao;Chen Wenjun;Yin Yihe;Yu Qifeng;Liu Xiaolin(Institute of Intelligent Optical Measurement and Detection,Shenzhen University,Shenzhen 518000,Guangdong,China;College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518000,Guangdong,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2023年第21期120-132,共13页
Acta Optica Sinica
基金
国家重点研发计划(2019YFC1511102)
国家自然科学基金(52208399,12002215)
中国博士后科学基金(2022T150437)。
关键词
相机组网
线状结构
形变监测
位移传递误差
构型优化
camera networking
linear structure
deformation monitoring
displacement transmission error
configuration optimization
