Study On Data Transmission Protocol And Pattern Of WSN-based Mechanical Vibration Monitoring

With the development of mechanical technology, machinery and equipment became more precision and automatic. Machinery and equipment condition monitoring and fault diagnosis technology has been gaining importance. The vibration of mechanical parts is a crucial parameter to reflect the equipment operational status. And it's also an important feature to analysis the equipment failure and malfunction. At present, the mechanical vibration monitoring system which based on the cable connected is relatively mature and widely used. But in wired monitoring systems, there are some shortcomings, such as: the high cost of wiring and deployment, poor maintainability and scalability and difficult to achieve moving vibration monitoring. Over the past decade, wireless sensor networks(WSN) technology had experienced from the concept putting forward to all kinds of innovative applications been implemented. With high-speed development of WSN application technology, it is possible to design the mechanical vibration monitoring system based on WSN. In this article, some key technologies of WSN for mechanical vibration monitoring are discussed. According to these technology requirements, the wireless networks protocol which is applicable for high data rate transmission has been designed. As the key part in WSN mechanical vibration monitoring system, it has an important significance.In order to using WSN for mechanical vibration monitoring application, the high speed network transmission and the high reliability of transmission is vital technology. After improving data collection methods, the transfer mode network, topology control and reliable mechanism, the mechanical vibration monitoring wireless networks mode has been formed.As the most important research part of this article, the wireless networks transport technology has been well analyzed. And the multi-sink topological structure was put forward. With this topological structure, the wireless network which is optimized for multi-hop transport became more efficient. Then, the WSN transport protocols and assistant mechanism can be designed and implemented to realize this topological structure control mechanism.The multi-sink based transport protocol, time synchronization mechanism and reliable transmission control protocol of WSN are implemented for mechanical vibration monitoring. A WSN vibration monitoring platform was presented by combining with exiting sensor and MICAz motes. And a data receiving and management program is implemented in PC platform. The experiment device for WSN in the mechanical vibration monitoring is built to evaluate its performance. The experiment shows that the WSN with multi-sink topology has a better performance for the mechanical vibration monitoring, and with the multi-sink networks, 1 kHz sampling frequency can be achieved, which can satisfy the mechanical vibration monitoring.There are the summarization of the article and expectation of the WSN for mechanical vibration monitoring development in the end of article. With the further works and related technology development, a mature WSN engineering system for mechanical vibration monitoring applications could be achieved. And with the characteristics of ubiquitous computing, a kind of intelligent WSN monitoring theory could be put forward in machinery and equipment monitoring and fault diagnosis research area.