Design And Implementation Of The Real-time Monitoring System For Curve Bridge Lateral Displacement Based On WSN

Bridges in modern social economic life plays a very important role, the curve bridge is for its better adaptability to the environment, has been widely used in social life, but in reality curved bridge’s transverse displacement is too large to damaged curved bridge occurs frequently. And most of the domestic studies of the transverse displacement of curved bridge’s bridges are derived from theoretical analysis, few studies on the actual lateral displacement monitoring, so we design a real time monitoring for curved bridge’s bridge transverse displacement which based on the wireless monitoring system.System is divided into two parts:the wireless sensor network of transverse displacement data wireless sensor part, and PC server transverse displacement data storage, management, dynamic display and remote browsing access part.In ZigBee wireless data sensing part, firstly analyzes the TI company’s ZigBee protocol stack Zstack, then we design four kinds of nodes:the coordinator node, routing nodes, wireless transverse displacement sensor terminal node and patrol node. Each node in the network use a chip of TI company CC2530as its main control chip. The coordinator node is mainly responsible for the wireless transverse displacement sensor network construction and network, it makes all around the bridge monitoring terminal nodes can conduct mutual information transmission network. In addition the coordinator is responsible for the online identification of system node and the wireless sensor network and PC server serial data communication. Routing nodes, it can relay and forwarding the sensor nodes’ data, improve wireless networking ability, make the ZigBee devices to form a multiple hops network. Transverse displacement sensor nodes integrated the horizontal displacement sensor, liquid crystal display, input and alarm equipment. It can work in two different timing mode to detect displacement data. Sensor node will be carried out data analog-to-digital conversion processing after the access to the data, and then, on the one hand will monitor the lateral displacement of the output on the LCD, if the horizontal displacement monitoring points more than the setting threshold, the node will carry on the alarm, to alert the persons or cars on the bridge. On the other hand, the horizontal displacement of the terminal node is send to coordinator by ZigBee network’s router, and the overrunning lateral displacement data transfer to the patrol node. Patrol node is a special router, it is mainly receiving node failure or displacement transfinite alarm information, after receiving the alarm information, can remind maintenance staff rushed to the scene confirmed alarm node status in time.In PC server part, using the Microsoft Visual Studio2012integrated development environment, development based on. NET Framework frame Windows server and client application. First, design the ZigBee coordinator and PC server serial communication procedures, it is responsible for receiving data from the lower machine wireless sensor network. Second, design the lateral displacement of the dynamic real-time display program, it write the serial port’s data in a Sql Server2008database, when there is a risk of data more than setting value, then use SMS to notify the system administrator, at the same time use the open source controls ZedGraph to dynamic real-time display correct node transverse displacement data. Finally, using the Socket communication mode, program the client and the server’s communication code, achieved the remote browsing the server though the client.