Development Of Mine Wireless Monitoring Node Powered By Vibration Energy

The problems of sensor wiring,communication and energy supply in traditional wired monitoring can no longer meet the monitoring requirements of modern coal mines.It is expected that the mine wireless monitoring node powered by vibration energy can be designed by vibration energy harvesting technology and wireless sensor network technology to solve equipment monitoring problems in complex environments under coal mines.The four piezoelectric energy harvesters designed before are analyzed in three aspects:energy output,energy capture bandwidth and structural characteristics,the most suitable energy harvesters is chosen as the capture unit of the wireless monitoring node.Analyze the factors which affect the efficiency of the chosen piezoelectric energy harvester,combined with the vibration characteristics under the mining excitation,formulate the series of criteria for the piezoelectric energy harvester in the working environment of the coal mining equipment,so that the piezoelectric energy harvester can efficiently capture the vibration energy in different mechanical parts.According to the characteristics of the energy output of the piezoelectric energy harvester and the requirements of the wireless monitoring node,the hardware and software design of the node is completed.The four-channel parallel micro-energy collecting circuit and the energy storage circuit are used to realize the collation and storage of the energy collected,and solve the problem of high impedance and very small current in the electromechanical coupling process of the piezoelectric material.A regulated power supply circuit is designed to provide a stable source of energy for the node;CC2530 wireless sensor module hardware platform is built to realize sensor signal acquisition,processing and wireless communication?Program optimization design for the actual performance requirements of nodes,and propose various energy-saving strategies to reduce node power consumption and extend node life.At the same time,through the Microsoft Visual Studio software platform,the host computer interface is designed to display the node monitoring information in real time.Finally,considering the size design,material selection and packaging process to complete the node package,design the experimental program and build the experimental platform to complete the node performance test.Using the new composite beam bistable piezoelectric energy harvester as the captive energy unit of the node,the trapping energy per unit time accounts for 26.66%of the total power consumption of the node,and the effective communication can be realized within 10m after the node is packaged,and the energy self-capturing?low power consumption and online monitoring are initially realized.