A new concept of frequency-excitation-up conversion to improve the yield of linear piezoelectric generators

被引:7
作者
Chen, W. [1 ,2 ]
Mo, J. L. [1 ,2 ]
Xiang, Z. Y. [1 ,2 ]
Wang, A. Y. [1 ,2 ]
Liu, Q. A. [1 ,2 ]
Qian, H. H. [1 ,2 ]
机构
[1] Southwest Jiaotong Univ, Tribol Res Inst, Sch Mech Engn, Chengdu 610031, Sichuan, Peoples R China
[2] Technol & Equipment Rail Transit Operat & Mainten, Chengdu 610031, Sichuan, Peoples R China
基金
中国国家自然科学基金;
关键词
Energy harvesting; Frequency-excitation-up-conversion; Ultra-low frequency; Friction nonlinearities; ENERGY HARVESTER; VIBRATION; OSCILLATOR; DESIGN; VERIFICATION; SQUEAL;
D O I
10.1016/j.sna.2021.112712
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A new and novel frequency-excitation up-conversion (FEUC) mechanism achieved by converting low frequency excitation into friction-induced vibration (FIV) is proposed to improve the output power of linear piezoelectric energy harvesters at ultra-low ambient frequencies. For comparison, a conventional resonant energy harvester and an impact-driven energy harvester are created, the output power is measured at the resonant frequency under a 0.5 g driving acceleration. Then, a friction system driven by reciprocating sliding and capable of generating FIV is established. The driving reciprocating is equivalent to the low-frequency ambient vibration, and a single piezoelectric cantilever beam is added to the friction system for energy recovery. The results show that, compared with the impact-driven energy harvester, the vibration frequency can be increased hundreds of times, and the excitation level can be improved several orders of magnitude by the friction nonlinearities. The impedance of the energy harvester is reduced significantly due to a sharp increase in the vibration frequency. In addition, the open-circuit voltage amplitude is not substantially lowered due to the significantly increased excitation level, even though the piezoelectric cantilever beam operates in a high-frequency condition and in the absence of resonance. Therefore, the output power is dramatically improved. The effectiveness and superiority of the FEUC strategy proposed in this work has been demonstrated. (c) 2021 Elsevier B.V. All rights reserved.
引用
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页数:11
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