Performance Exploration of A Radially Layered Cymbal Piezoelectric Energy Harvester under Road Traffic Induced Low Frequency Vibration

2018 6th International Conference on Mechanical Engineering, Materials Science and Civil Engineering

材料科学;机械制造;土木建筑工程

Liu, Xinnan^1 ; Wang, Jianjun^2

School of Civil Engineering, North China University of Technology, Beijing, China^1

Department of Applied Mechanics, University of Science and Technology Beijing, Beijing, China^2

关键词: Experimental calibration;    Low-frequency vibration;    Mechanical coupling;    Piezoceramic rings;    Piezoelectric energy harvesters;    Radial direction;    Theoretical calculations;    Traffic induced vibrations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/542/1/012075/pdf
DOI  :  10.1088/1757-899X/542/1/012075

来源: IOP

【 摘 要 】

A type of radially layered cymbal piezoelectric energy harvester is designed and fabricated. It is made of two cymbal metal caps, two axially polarized piezoceramic rings, one solid metal disk, one common metal ring and one drilled metal ring. The mechanical couplings in radial direction are finished by using extra strong epoxy. The mechanical couplings in axial direction are finished by using screw bolts. Subsequently, the force transferring coefficient of each cymbal metal cap is approximated through both theoretical calculation and experimental calibration. Aiming at matching the road traffic induced vibration frequencies that are predominantly ranging from 5Hz to 25Hz, the approximated analytical model of the harvester is established at frequencies below 30Hz. The model's predictions agree reasonably with the measured data. Furthermore, the experimental results indicated that the harvester was able to generate a power of about 0.92mW across a 0.8MΩ resistor under the force of 500N at a frequency of 20Hz. The present work provides a new design concept for developing the novel cymbal harvesters used in roadway systems to harvest the traffic induced vibration energy.