Abstract
As wireless sensor network (WSN)-based structural health monitoring (SHM) systems are increasingly being employed in civil infrastructures and building structures, the management of large numbers of sensing devices and the large amount of data acquired from WSNs will become increasingly difficult unless systematic expressions of the sensor network are provided. This study introduces a practical WSN for SHM that consists of sensors, wireless sensor nodes, repeater nodes, master nodes, and monitoring servers. This study also proposes a symbolic and graphical representation scheme (SGRS) for this system, in which the communication relationships and respective location information of the distributed sensing components are expressed in a concise manner. The SGRS was applied to the proposed WSN, which is employed in an actual large-scale irregular structure in which three types of sensors (75 vibrating wire strain gauges, 10 inclinometers, and three laser displacement sensors) and customized wireless sensor nodes are installed. The application results demonstrate that prompt identification of sensing units and effective management of the distributed sensor network can be realized from the SGRS. The results also demonstrate the superiority of the SGRS over conventional expression methods in which a box diagram or tree diagram representing the ID of sensors and data loggers is used.
Highlights
Structural health monitoring (SHM) has been attracting increasing interest as a method to determine the structural responses and evaluate the safety of civil infrastructure and building structures based on sensor technology [1,2,3,4,5,6,7]
This study proposes an symbolic and graphical representation scheme (SGRS) to express the complex wireless sensor network (WSN) that is employed in the monitoring of structural responses
The SGRS developed here symbolically expresses the locations and communication relationships of sensors and wireless nodes for each sensor and graphically expresses the composition and relationships pertaining to each sensor type, allowing the entire system to be represented in a concise and effective diagram
Summary
Structural health monitoring (SHM) has been attracting increasing interest as a method to determine the structural responses and evaluate the safety of civil infrastructure and building structures based on sensor technology [1,2,3,4,5,6,7]. Conventional wire-based SHM has been shown to have certain limitations in applications involving actual structures, including the use of long and complex cable connections between sensors and data loggers, which is associated with high costs, in the initial installation, and for maintenance during operation [13]. For these reasons, there has been considerable interest in wireless sensor networks (WSNs) because they represent a key technology for those who require effective. In the proposed SGRS, the information obtained from measuring devices is expressed together with the relationship among the employed devices in a compact manner, which enables the network administrator to efficiently manage the sensor networks and measured data
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