Abstract
In replace of human labor, wireless sensor networks (WSNs) are increasingly being utilized to perform structural health monitoring of underground tunnel. Due to its complex environment, the deployment of sensor nodes poses a big challenge to related staff. How to use the optimal number of sensor nodes deployed in the underground tunnel to obtain a satisfactory monitoring is our main consideration. In this paper, we propose a deployment strategy based on the optimal index to provide guidelines for sensor node placement. The objective of the strategy is to put sensor nodes in a proper site to gain maximum sensing information, thus eliminating redundant sensor nodes as well as saving costs.
Highlights
Sensor node placement should meet two basic requirements: coverage and connectivity
In the presence of sensor failures, a network still remains connected relying on some connectivity modes of wireless sensor networks (WSNs) [4,5,6]
Coverage and connectivity together are two fundamental metrics to evaluate the performance of WSNs [7, 8]
Summary
Sensor node placement should meet two basic requirements: coverage and connectivity. There is growing interest in deploying wireless sensors in the underground tunnel to perform structural health monitoring including damage detection, crack detection, and water leakage detection [9, 10]. A complex underground environment brings a considerable difficulty in deploying sensor nodes. Nestorovic and Trajkov developed a general approach to optimal actuator and sensor placement applicable for beam and plate structures as well as other complex geometries of structures, which has advantage over modal truncation and mathematical criteria due to its selection of the modes of interest [12].
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