采掘激励下压电俘能器建模与发电特性

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关键词：压电俘能器；建模；电压；采煤机；多方向；磁距

中图分类号：TH113.1 文献标志码：A 文章编号：1672-9315（2025）05-1018-17

DOI：10. 13800/j. cnki. xakjdxxb. 2025.0517

Model and power generation characteristics of piezoelectric energy harvesters under mining excitation

ZHANG Xiaoyu1， ZHANG Xuhui1，2

（1. College of Mechanical Engineering，Xi’an Universityof Scienceand Technology，Xi’an 71oo54，China; haanxi KeyLaboratoryofIntelligentDetectionandControlforMiningElectromechanicalEquipment，Xi’an7054，China

Abstract： To address the power supply challenge of wireless sensor nodes for shearers，the piezoelectric energy harvester is expected to provide electricity for them.Power generation characteristics aect the electricity amount，and the research of generation electricity characteristic under mining excitation has important scientific significance.Firstly，the electromechanical model，the restoration force model and the magnetism force model were respectively established by using Lagrange function，data fiting method and magnetization current method.Secondly，the coal model was established by using EDEM software. Thirdly，the acceleration of each position was established by using RecurDyn software.Finall，the electromechanical model was solved by using Runge Kutta method，and the influence of different coal viscosities，diffrent positions of coal mining machine and different magnetic distances on the voltage were analyzed， with the experimental verification made.The result shows： the energy harvester is subjected to acceleration of the front rollr，rear roller，front rocker arm，rear rockerarm and machine body，at the magnetic distance with high voltage，the voltage and acceleration gradually decrease and entirely increase when viscosity of coal increases. To achieve high-voltage output， the magnetic force is introduced into the energy harvester and an appropriate magnetic distance is selected.It is feasible to consider instaling the energy harvester at the upper end of the rocker arm，close to the drum，or at multiple positions of the shearer simultaneously. The research provides the theoretical guidance for optimizing the structure and engineering application of energy harvester.

Key words： piezoelectric energy harvester; model; voltage; coal mining machine; multi-direction; magnet distance

0 引言

中国对采煤机的智能化水平提出更高的要求，需要采用无线传感器节点感知采煤机运行状态，目前主要采用化学电池为无线传感器节点供电，化学电池电量有限，供电问题成为无线传感器节点的关键问题1，采煤机在截割煤层时产生剧烈振动能量，压电俘能器能够将振动能转化为电能，有望为无线传感器节点供电，其发电特性影响发电量。（剩余16111字）