期刊
SMART MATERIALS AND STRUCTURES
卷 30, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-665X/ac04c3
关键词
broadband energy harvesting; piezoelectric; local resonance; Bragg band gap; traveling waves
资金
- National Science Foundation [CMMI-1933436]
This paper investigates an electromechanical metastructure for harvesting and attenuation of traveling wave energy. The metastructure is capable of achieving maximum energy conversion and vibration mitigation through locally-resonant and Bragg band gaps. Experimental results validate the theoretical models and applicability of the proposed metastructure.
In this paper, we explore an electromechanical metastructure consisting of a periodic array of piezoelectric bimorphs with resistive-inductive loads for simultaneous harvesting and attenuation of traveling wave energy. We develop fully coupled analytical models, i.e. an electroelastic transfer matrix method, and exploit both locally-resonant and Bragg band gaps to achieve a multifunctional metastructure which is capable for maximum energy conversion and vibration mitigation in a broadband fashion. Our analytical and numerical results show that the proposed metastructure can achieve energy harvesting efficiency up to 95% at the local resonance frequency of 3.18 kHz, while reaching about 51% at 5.8 kHz near the upper limit of the Bragg band gap. The broadband vibration mitigation performance based on 50% power attenuation is predicted as 1.8 and 1.1 kHz in the vicinity of the band gaps. The theoretical frameworks and the applicability of the proposed metastructure are validated using a full-scale experimental setup.
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