The Design And Implementation Of Wireless Sensor Network For CBM Development

Wireless sensor network (WSN) mainly combines the sensor technology and wireless technology. With the maturity of wireless technology and sensor technology, it has been applied to more and more fields. It is not only widely used in military and medical fields, but also has a more immeasurable value in the field of industry. Wireless sensor network has characteristics of large-scale, extensiblility and so on, which is generally used in some complex environment, steep mountains or areas with better visibility. The application of wireless sensor network not only solves the problem of communication link between control room and field in the complex area, but also reduces the cost, improves the economic efficiency and solves the bottleneck problem of the industrial development.In this paper, mainly aiming at the characteristics of Shanxi coal bed methane development, a set of wireless sensor network and the corresponding management subsystems have been designed.In order to achieve the majority of well area under the low cost investment, to improve the level of automation and information, and realize the "remote monitoring-unattended" safe and efficient production management mode at last. The specifics as follow:1. Analysis and design of wireless sensor network for coal bed methane development The wireless sensor network for coal bed methane development has characteristics of easy expansion, easy networking, self-healing,interaction and so on. In this project, the tree topology is used as the main network with "root-branch-leaf as the main node. On this basis, the corresponding key technologies are developed independently.2.Design and implementation of the WSN key technology for coal bed methane developmentWireless management subsystem is responsible for the monitoring and control of the whole network. It can be used to control the real-time running state of each node and find out the faulty node in time and deal with it. Dynamic self-healing technique is a key technique which is developed based on the topological backbone network. When the network backbone operating link goes wrong,the dynamic self healing technology is converted to the backup operating link, which guarantees the connectivity of the link in real time and solves the problem of network paralysis caused by faulty node. The wireless transmission data packet designed in this system has a unified format of type, data length, and data content. Among which, the type specifies the content of the information contained in the data packet and the data length indicates the length of the data content. According to the receiving and sending situation of the terminal management subsystem, packets can be divided into two categories: receive packets and command packets. The nodes transfer the important information in the format of wireless transmission data packet with the analysis being shown on the terminal management subsystem, which realizes the supervision of terminal management subsystem for each node. At the same time, the terminal management subsystem sends the command packet to each node to achieve the control of the node.3.Experiment and conclusion of wireless sensor network for coal bed methane developmentBy setting up the experiment platform of wireless sensor network, the experiments of network multi hop routing,distance communication, wireless network dynamic self-healing and so on have been done. According to the analysis of the parameters as network delay, rate and others, the reliability and feasibility of network and the network were optimized once again.