Piezoelectric metastructures for simultaneous broadband energy harvesting and vibration suppression of traveling waves

Abstract

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.

Electroelastic metasurface with resonant piezoelectric shunts for tunable wavefront control

“…Inductive and resistive loads in the piezoelectric-shunt circuit were first proposed by Hagood and von Flotow [6] to enhance the vibration suppression performance of the piezoelectric metastructure. Later, other piezoelectric shunts with inductance and negative capacitance were explored to design electromechanical MMs and phononic crystals, which exhibited unconventional behaviors such as tunable bandgap and dispersive properties [7], leading to diverse applications including sound/vibration mitigation [10][11][12][13], energy harvesting [14,15], wave directivity manipulators [16][17][18][19][20], adaptive gradient index (GRIN) lens [21,22] and multifunctional designs [15,[23][24][25].…”

Enhancing the Bandwidth and Energy Production of Piezoelectric Energy Harvester Using Novel Multimode Bent Branched Beam Design for Human Motion Application

“…Various studies on mechanical design improvement of piezoelectric energy-harvesting systems associated with high and low-frequency vibrations have been conducted [ 1 , 5 , 6 , 7 , 8 ]. Moreover, there have been recent developments in electrical design improvements, material improvements, and hybrid structural improvements with related analytical and theoretical frameworks of PEHs [ 9 , 10 , 11 , 12 , 13 ]. However, studies focusing on the ultralow excitation frequency [ 14 ] (i.e., 1 Hz to 10 Hz), such as human-induced motions, are relatively limited.…”

Theory of Truncation Resonances in Continuum Rod‐Based Phononic Crystals with Generally Asymmetric Unit Cells

“…These mismatches are most commonly created by layering two or more materials in a spatially periodic manner with the smallest self-repeating block being referred to as the PnC's unit cell. Owing to their ability to manipulate incident vibroacoustic excitations, PnCs have been extensively used in a broad range of applications ranging from energy harvesting [8,9] and attenuation of airborne sound, [10] to nonreciprocal wave transmission [11,12] and ultrasonic wave focusing. [13] In their idealized form, PnCs are typically modeled as unbounded systems with an infinite number of unit cells.…”