Bridge cables are used as critical structural components for cable-stayed bridges. It is essential to identify and monitoring
the cable force of cable-stayed bridges in real time and continuously. In this paper, the design of a remote real-time cable
force monitoring system including both hardware and software components are realized and the specifications of the
system are also presented. The system was implemented in the Tianjin Yonghe cable-stayed bridge located in Tianjin,
China, to remotely monitor the cable fore of the bridge and provide the condition assessment of the cables to the users
via Internet. Experiences with this system demonstrate how effective low cost system provides a tremendous cost savings
in terms of travel time, maintenance, and repair costs. This paper will also discuss the monitoring system and provides a
preliminary analysis based on the data acquired from this system.
Health Monitoring is very important for large structures like suspension- and cable-stayed bridges, offshore platforms, tall buildings and so on. Due to recent developments in new sensor systems, wireless communication systems, Internet-based data sharing and monitoring, advanced technologies for structure health monitoring (SHM) have been caused much more attentions, in which the wireless sensor network is recently received special interests. Wireless sensor networks (WSNs) consist of large populations of wirelessly connected nodes, capable of computation, communication, and sensing. In this paper, a wireless sensor networks based health monitoring system for tall buildings has been explored integrated with wireless sensing communication, computation, data management and data remote access via Internet.
Firstly, a laboratory prototype was designed and developed to demonstrate the feasibility and validity of the proposed system. Wireless sensor nodes were deployed on a test structure, the data being sensed by the sensor nodes in the network is eventually transmitted to a base station, where the information can be accessed. Through a Wireless Local Area Network (WLAN, IEEE802.11b), the simulated data was transferred among personal computers and wireless sensor nodes peripherals without cables. And then, a Wireless Sensor Network (WSN) includes eight sensor nodes and one base station was installed on Di Wang Tower to verify the performance of the present system in-depth. Finally, comparisons between WSN and cable-based monitoring analytical acceleration responses of field measurement have been performed. The proposed system is shown to be effective for structural health monitoring.
With recent advances in digital circuitry, wireless communications, and Micro-Electro-Mechanical Systems (MEMS) technology have led to the emergence of Wireless Sensor Networks (WSNs) as a novel class of networked embedded systems. Many projects and diverse applications for these systems are currently being explored. The determination of location and extent of structural damage known as Structural Health Monitoring (SHM) is significant importance to civil infrastructures such as bridges, dams, offshore platform large buildings. For applying WSN to real-world civil infrastructures monitoring, sensor network architecture is proposed in this paper. The system development includes hardware and software design of the wireless sensor nodes, the design of the sensor network, and the capabilities for remote data access and management. With the ready availability of MEMS sensors, RISC micro-controller and RF unit, a wireless sensor node is designed and fabricated. The data being sensed by the sensor nodes in the network is eventually transmitted to a base station, where the information can be accessed. Via the Internet, multiple users with a proper access authorization to the URL site may simultaneously acquire, display data and monitor real-time performance of the structures remotely using a Web browser. In order to support hardware and SHM algorithm development, primitive software architecture is developed using commercially software systems. To demonstrate the feasibility and validity of the proposed WSN, the performance test is done in the laboratory.
The process of implementing a damage detection strategy for engineering systems is often referred to as structural health monitoring (SHM). And Structural Health Monitoring is very important for large structures like suspension- and cable-stayed bridges, towers, offshore platforms and so on. Some advance technologies for infrastructure health monitoring have been caused much more attentions, in which the wireless sensor network (WSN) is recently received special interests. The WSN would have lower capital and installation costs as well as ensure more reliability in the communication of sensor measurements. However, in the context of untethered nodes, the finite energy budget is a primary design constraint. Therefore, one wants to process data as much as possible inside the network to reduce the number of bits transmitted, particularly over longer distances.
In this paper, a WSN is proposed for health monitoring of the offshore platform, and a laboratory prototype was designed and developed to demonstrate the feasibility and validity of the proposed WSN. In the laboratory prototype, wireless sensor nodes were deployed on a model of offshore platform, a Wireless Sensor Local Area Network (WSLAN) transfers the simulated data among personal computer and microsensor nodes peripherals without cables. To minimize the energy consumption, algorithms for fusing the acceleration, temp and magnetic sensors on a single node are being developed. And based on fusing the data from local nodes, the current state of structure health was determined.
In our deployment, we using UC Berkeley motes as the wireless sensor nodes to examine many of the issues relating to their usage and our information fusion algorithm.