Wind-induced Piezoelectric Vibration Energy Harvesting Technology Based On Stress Testing Sensor Nodes Of Elevator Drum

Mine hoist, known as the mine throat, is the critical equipment to ascendminerals, coals, gangues, decentralize materials, lift personnels and equipments.Mine depth has reached km above with the deep, large-scale mining resourcesdevelopment. The occurrence possibility of major fatality, such as escaping guide railof lifting container and falling accident, increases because of the complicatedgeological conditions and time-varying environment. Therefore, it is particularlyimportant to detect the potential malfunctions and defects in hoisting system early andreal-time monitor the running state for the purpose of improving the mine hoistingsystem reliability, ensuring life and property safety and national coal energy supply.It is an advanced state monitoring method of a large lifting system currently bymeans of real-time monitoring the drum stress to reflect the elevator running status.But in practical application, the lifetime of stress testing sensor nodes is short due tothe high stress signal frequency and large amout of data transfer. Therefore, it is oneof the problems needs to be solved urgently to real-time charge battery and prolong itslifetime by harvesting the energy existed in the surrounding environment.This dissertation, combined with the operating characteristic of mine hoist,proposed the wind-induced piezoelectric vibration energy harvesting technology tosupply power for stress testing sensor nodes of elevator drum. The main workincludes:1、This dissertation first investigated the research status and development trendof the micro wind generators at home and abroad, and then put forward the idea todynamic charge the power supply system of stress testing sensor nodes based onelevator drum by wind-induced piezoelectric vibration energy harvester.2、Next, the dissertation built the theoretical vibration models of wind-inducedpiezoelectric cantilever vibration energy harvester device on the basis ofwind-induced vibration characteristics on hoist drum surface and then studied theelectromechanical coupling properties of the energy harvester device.3、Thirdly, the dissertation built the finite element model of piezoelectric bimorphcantilever and then simulated its static, modal and piezoelectric harmonic response byANSYS software. On that basis, the dissertation analyzed the relationship betweenoutput performance and the structures of piezoelectric vibration energy harvesterdevice. 4、After that, This dissertation designed the energy harvesting circuit ofpiezoelectric cantilever vibration energy harvester device by the software of AltiumDesigner Summer. And then the dissertation simulated the output signal of the energyharvesting circuit by LTspice software.5、And then, this dissertation, to verify the designed piezoelectric vibrationenergy harvesting system, carried out the simulation experiment of wind-inducedpiezoelectric vibration energy harvesting on drum surface. The experimental resultsshowed that: the piezoelectric energy harvesting system designed in this dissertationnot only can charge a lithium battery, but drive the step-down converter to supplypower for stress texting sensor nodes directly.