Study On Time Synchronization Of Wsn-based Mechanical Vibration Monitoring

Relative to the high cost of wiring and deployment, poor maintainability of wired monitoring systems, The use of low-power, low cost, distributed and self-organization of wireless sensor network (Wireless Sensor Networks, WSN) build the wireless monitoring system provides a new solution for mechanical vibration monitoring. Time synchronization is an important support technique of WSN, on which many designs of WSN is based. However, traditional algorithms are not applicable WSN Because of the complexity, energy issues, cost and size. Therefore, time synchronization method for wireless sensor networks become a hot research field at home and abroad. According to requirements of mechanical vibration monitoring applications,a wireless sensor network time synchronization is designed and implemented, which has an important significance for the Application of WSN-based mechanical vibration monitoring.Wireless sensor networks is a new subject, and it is application highly related, the technology of which in different applications with a greater difference. In this paper, classic synchronization algorithms under the three modes were summarized, and the affects of data fusion, data analysis and Sleep / wake-up mechanism on WSN-based mechanical vibration monitoring were analyzed. It is indicated that the characteristics of time synchronization on mechanical vibration monitoring should be microsecond-level accuracy, low overhead and multi-hop synchronization.The low overhead multi-hop time synchronization approach based on Greedy heuristic is proposed for the time synchronization requirements of Mechanical vibration monitoring. A known single hop synchronization approach was extended to multi-hop synchronization by employing a greedy heuristic algorithm to select reference nodes. The simulation results reveal that the proposed approach has the same synchronization accuracy as the well-known schemes RBS and significantly reduces the energy consumption.The wireless sensor network time synchronization component was designed and implemented based on wireless Sensor network nodes MICAz and Moteworks platform, to test the performance of which the experimental platform for WSN-based mechanical vibration monitoring is built. The experiment results reveal that Time synchronization accuracy of the proposed approach can meet the needs of machine vibration monitoring, and the survival time of WSN-based mechanical vibration monitoring system is extended, which show that the proposed approach has a better performance for the mechanical vibration monitoring application.