冲击工况下用于煤岩界面识别系统的压电叠堆俘能器研究

Study on piezoelectric stacks harvesters used in coal-rock interface recognition system under impact environment

针对当前切割响应分析法识别煤岩界面所存在的有线传输和供电困难等问题,提出了一种基于压电叠堆的无线、自供能煤岩界面识别系统。阐述了系统整体设计方案、能量采集与能源管理模块、信号处理与无线传输等模块的功能。在自主研发的落锤装置上进行了压电俘能器冲击实验,研究了压电叠堆俘能器的冲击载荷响应特性。实验结果表明,受冲击载荷作用,俘能器输出电压随着冲击力大小呈线性变化,且当落锤高度为250mm时其输出功率可达到35W,理论上足以为各种传感器和Zig Bee无线模块供电。

Aiming at the difficulty in cable transmission and power supply of current Cutting Response Analysis（CRA）method,a self-powered coal-rock interface recognition system based on piezoelectric stacks was proposed.The system design scheme was illustrated.The functions of the modules including the energy harvester and energy management circuits,as well as signal processing and wireless transmission modules were demonstrated.The experiments that the piezoelectric stacks were impacted by shock load was conducted on the self-developed drop hammer and the response characteristics of the piezoelectric stacks to the shock load were investigated to explore the system feasibility and actual situation when the pick cut the coal-rock interface.The experimental results show that the piezoelectric stack harvester＇s output power reached 35 W when the height of the drop hammer was 250 mm,which could power various sensors and the Zig Bee wireless module.