Research On Wireless Sensor Networks For Bridge Monitoring

In recent years, with the progress of microelectronic technology, network technol-ogy and wireless communication technology, wireless sensor network technology has achieved rapid development and attracted lots of attention.Because of its technical advantages, wireless sensor network is widely used in national defense, environmental science, health care, smart home, traffic management and many other scenarios. Structural health monitoring has emerged as an increasingly active research area in academic and engineering fields.Bridge is one of the vital parts in traffic and transportation system. The operation safety of bridges is critical to national security and the people’s livelihood. Thereby, it is of great significance in theory and practice to perform structural health monitoring for bridges. Wireless sensor network is known to be easy to deploy and inexpensive to maintain. It is thus suitable for structural health monitoring of bridges. This thesis gives a survey on structural health monitoring systems based on wireless sensor network technology. Some basic theories and typical methods in subsystems are presented, and critical technologies are analyzed. Finally, possible problems in existing systems and directions on future work are analyzed and summarized.Flooding protocol is an important research topic in wireless structural health mon-itoring system. In services such as topology formation, routing, target detection and data query, flooding protocol is needed. We propose a novel Constructive Interference-based Reliable Flooding(CIRF), which is suitable for wireless structural health moni-toring system. Constructive interference is employed and integrated with RI-MAC in CIRF to avoid redundant transmissions and improve link quality. Evaluation result-s show that CIRF achieves reliable flooding with reduced flooding latency and less energy cost.