利用无线传感器网络实现大跨度桥梁的振动检测介绍.doc

利用无线传感器网络实现大跨度桥梁的振动检测 摘要 桥梁作为国家基础设施的重要组成部分，在国民经济和社会生活中的作用越来越重要，人们对大型桥梁的安全性、耐久性及正常使用功能日益关注和重视。对于大跨度桥梁的结构健康监测，传统的人工检测方法存在主观性强,整体性，时效性差等不足.目前广泛使用的有线健康监测在应用中也存在着布线难，系统易受环境影响等困难。利用无线传感器网络技术对桥梁结构健康状态进行监测。不仅保留了有线健康监测的优点，而且弥补了其在应用中的不足。文章首先对整个系统的组成进行了说明，接着分别对无线传感器网络节点以及基站的组成和作用进行了说明。在此基础上，提出温度漂移对无线传感器网络节点的加速度传感器输出的影响，并对如何利用温度补偿技术来校准加速度传感器的输出值进行了探讨。且给出了数据校准前和数据校准后的对比图。接下来提出节点时钟同步的必要性，并对网络的时钟同步原理进行了探讨。在润扬长江大桥锚索上安装无线传感器网络，利用节点采集锚索的振动信息，并将其发送到基站节点。经数据分析可以得出锚索的振动频率，根据振动频率，便可以分析其受力情况，最终可以判断桥梁的结构健康状态。 关键词：桥梁无线测试系统 无线通信 数据采集 Abstract As an important part of the national infrastructure of the bridge, and role in the national economy and social life of the more important, people on the large bridge safety, durability and function of normal use of increasing concern and attention. For structural health monitoring of long-span bridges, the traditional manual detection method such as strong subjectivity, integrity, lack of poor timeliness. Cable health monitoring is currently widely used in the application also exists in the wiring is difficult, the system is easily affected by environment and so difficult. Monitoring the health state of bridge structure by using the technology of wireless sensor network. Not only retains the advantages of cable health monitoring, and make up for the deficiencies in the application. Firstly, on the composition of the whole system are described, then the wireless sensor network node and the base station components and functions are described. On this basis, the influence of temperature drift of accelerometer output is proposed for wireless sensor network node, output and to calibrate the acceleration sensor on how to use the technique of temperature compensation value is discussed. And gives the comparison of data before and after calibration the calibration data. Then put forward the necessity of node clock synchronization, and clock synchronization principle of network are discussed. The installation of wireless sensor network in cable, using the vibrat