摘要
由于在施工成本和安装、维护便易性的突出优势,无线传感技术现越来越多地应用到大型结构上。然而受到长距离实时通信、长期供电和系统室外可靠性等关键问题的制约,结构健康监测的无线化目前还有待发展。本项目以国内某在建大跨度体育馆结构为应用对象,设计了一套基于Narada模块的无线健康监测系统,用于观测该结构加速度、应变和温度的实时变化。现场实测结果检验了该套系统在实际工程中进行多点实时无线动态测量和事件触发等功能,并能适应大跨度空间结构体量庞大、构型复杂、测点繁多等特点;与此同时还反映出无线传感技术应用于工程健康监测中的一些共性问题。该系统有望在其他复杂大型结构整体健康监测中推广应用。
Wireless sensing technology is getting more and more applications in large scale structures due to its prominent advantage in construction cost efficiency and simplicity in installation and future maintenance. However it is not yet a mature technique for structural health monitoring until problems in long-distance real-time communication, power harvesting and reliability in outdoor environment are solved. In this work, a wireless sensing system based on Narada units is designed for the health monitoring of a large span gymnasium structure under construction. Real-time data of global vibration, member strain and temperature are recorded via this system. The system was customized to the characteristics of spatial structures such as large span, complex configuration and considerable amount of sensors. Field tests validate the functionality of this wireless system in multi-point real-time measurement and event triggering when applied on a full scale structure exposed to outdoor environment. Some common problems of applying wireless technology in structural health monitoring are reflected and discussed. With specific modification, this system can hopefully be employed on other structures that are spatially large and geometrically complicated.
出处
《空间结构》
CSCD
北大核心
2013年第4期88-95,共8页
Spatial Structures
基金
Project supported by China Scholarship Council & National Natural Science Foundation of China(50638050)
关键词
无线传感
大跨度结构
健康监测
wireless sensing
large span structures
health monitoring
