Reseasch Of Wireless Sensor Technology In Mine Pressure Monitoring Systems

Coal is the important energy resources of china, and china is the principal country of world's coal production and consumption, also the country of coal mine accident-prone, roof accident has been an important proportion in various types of coal mine accidents, the research and improvement of mine pressure monitoring systems has the important sense for the roof accident and improving conditions of coal mine production safety.A monitoring systems of mine pressure based on wireless communication technology is studied by network technology of wireless sensor combining the actual situation of mechanized mining face, and the difficulties of monitoring systems wiring at the present stage and the inconvenience of monitoring equipment constantly moving in pace with work face forward are improved.The research focuses on the following aspects:(1) The protocol standards of ZigBee is defined and a topological structure of mine pressure monitoring systems based on wireless sensor networks is established by the analysis of several common wireless communication technology according to the characteristics of underground wireless transmission.(2) Routing algorithm to ZigBee is studied according to the particular environmental characteristics of mine pressure monitoring, and data transmission paths of network nodes are selected by the algorithm combining layered clustering routing with tree routing in the systems, a tree routing algorithm based on energy balance routing algorithm is proposed, for improving energy imbalance of network nodes caused by frequent data transmission, and excessive energy consumption which result in the congestion of data flow and discontinuity of network, so the systems reliability is improved and life cycle is extended.(3) The detailed design for function nodes hardware of monitoring systems is given,Considering the advantages of high-performance, high speed, low power, high speed and On-chip hardware resource-rich to AVR SCM, for the superiority of low cost, low power consumption and ensuring higher data processing capability of systems, the hardware circuits of gateway node and routing node are made up by ATmega128L microprocessor, CC2420 RF module, and peripheral circuits, and terminal node applies CC2430 a type SOC system. The hardware circuits and software design are given.Upon completion of the above research work, energy consumption of data and node failure probability are tested under experimental conditions of simulated mine environment by improved routing algorithm of sensor node, wireless communication between nodes is tested also. Simulation results show that systems'performance achieves desired research goals, and the systems meet the related requirements and regulations of mine pressure monitoring systems.