| With the rapid development of economy, large-scale infrastructures construction are in the ascendant in China, many remarkable infrastructure projects in our country have been built or are being built. It is of great significance to provide the disaster warning, the safety assessment for the running state of infrastructure, the protection of people’s life and property safety with the structure health monitoring technology, which contains real-time monitoring, timely detection, damage location and identification, disaster warning and so on. As to its simple deployment and low cost, etc, wireless sensor network becomes a research focus in information acquisition, processing and data transmission for health monitoring system.Based on the systematic research on the sensing, intelligent control, damage identification and data fusion technology, this paper has a systematic analysis and research on the demand for health monitoring, wireless sensor network technology, routing algorithm, algorithm performance assessment and algorithm simulation. The main contents of the research as follows:1. This paper systematically expounds the current problems existing in the field of infrastructure health monitoring and the current research and development of the infrastructure health monitoring. It also has a thorough research on some key technologies for health monitoring, such as sensor technology, intelligent control technology, the internet of things technology, damage identification technology, data fusion technology, wireless sensor network technology, etc. After that we have had a clear understanding about the requirements for the infrastructure health monitoring.2. The routing algorithms of wireless sensor network have been mainly studied in this paper, Some of the existing routing algorithms of WSN have been classified and analyzed. From the perspective of timely and reliable data transmission, some typical routing algorithms are analyzed in detail, such as the Directed Diffusion algorithm for data-centric (DD), the Sequential Assignment Routing algorithm with QoS (SAR) etc. Furthermore, a comparative analysis of performance of different algorithms has been made. Then, we have proposed some performance evaluation indicators for algorithms. It laid the foundation for the new algorithm and the simulation experiment verification.3. Based on the new characteristics for wireless sensor network of large-scale deployment of sensors, multi parameter acquisition, large flow of monitoring data, information real-time and reliable transmission, static sensor nodes etc. in infrastructure health monitoring, combined with the requirements of energy saving, remote transmission and extensibility in health monitoring routing design, this paper has proposed a routing algorithm based on network backbone link identification named LIRA. This algorithm is designed to reduce or avoid the network congestion, reduce end-to-end delay, balance load of the network and ensure the sensing information transmitted to the remote monitoring center reliably as soon as possible. This paper has elaborated the thoughts, the problem description and definition of the algorithm systematically, made a deep theoretical analysis on it, and its implementation process has been introduced.Finally, LIRA is simulated on the NS-3simulator, after that the comparative analysis on these algorithms is given. Experimental results show that the LIRA algorithm has a lower average end-to-end delay and higher packet delivery rate than DD and SAR, and it can satisfy the health monitoring requirements of the real-time and reliability transmission, the feasibility and effectiveness of the algorithm have been verified. |
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