Tunable resonant frequency power harvesting devices

Wu, Wen-Jong; Chen, Yu-Yin; Lee, Bor-Shun; He, Jyun-Jhang; Peng, Yen-Tun

doi:10.1117/12.658546

Cited by 85 publications

(73 citation statements)

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“…However, several other concepts have also been considered. Among these concepts is the use of a tunable resonant frequency power harvesting device to continuously match the time-varying frequency of the external vibration in real time as reported by Wu et al [8]. Another concept developed by Badel et al [9] relies on the use of a harvester augmented with an electrical switching device in which the switch is triggered to maximize the output voltage of the harvester.…”

Section: Introductionmentioning

confidence: 96%

A Distributed Parameter Cantilevered Piezoelectric Energy Harvester with a Dynamic Magnifier

Aladwani

Aldraihem

Baz

2014

Mechanics of Advanced Materials and Structures

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A conventional energy harvester typically consists of a cantilevered composite piezoelectric beam, which has a proof mass at its free end while its fixed end is mounted on a vibrating base structure. The resulting relative motion between the proof mass and the base structure produces a mechanical strain in the piezoelectric elements, which is converted into electrical power by virtue of the direct piezoelectric effect. In this article, the harvester is provided with a dynamic magnifier consisting of a spring-mass system that is placed between the fixed end of the piezoelectric beam and the vibrating base structure. The main function of the dynamic magnifier, as the name implies, is to magnify the strain experienced by the piezoelectric elements in order to amplify the electrical power output of the harvester. With proper selection of the design parameters of the magnifier, the harvested power can be dramatically enhanced and the effective bandwidth of the harvester can be improved. The theory governing the operation of this class of cantilevered piezoelectric energy harvesters with dynamic magnifier (CPEHDM) is developed using the Generalized Hamiltons's Principle. Numerical examples are presented to illustrate the merits of the CPEHDM in comparison with the conventional piezoelectric energy harvesters (CPEH). The obtained results demonstrate the feasibility of the CPEHDM as a simple and effective means for enhancing the magnitude and spectral characteristics of CPEH. Nomenclature b = width of beam and piezoelectric layers, m {B} = global vector of piezoelectric action {B e } = element vector of piezoelectric action c a = viscous air damping coefficient, Ns/m C p = internal capacitance of a single piezo-layer, F C E 11 = Young's modulus of the piezoelectric layers at constant electric field, N/m 2 C s I t = equivalent damping term due to structural viscoelasticity, Ns/m 3 d 31 = piezoelectric strain constant, m/volt D 3 = electrical displacement, coloumb/m 2 [D a ] = global damping matrix due to viscous air damping [D t ] = total global mass normalized damping matrix E 3 = electric field, volt/m E b I b = flexural rigidity of the beam, Nm 2 E t I t = flexural rigidity of the piezo-beam, Nm 2 { f } = modal mechanical forcing vector {F} = amplitude of modal mechanical forcing vector h = half the thickness of the beam, m j = unit imaginary number k f = stiffness of the magnifier spring, N/m 2 [K t ] = total global mass normalized stiffness matrix L = length of the piezo-beam, m L = Lagrangian, Nm L e = length of the eth element of the piezo-beam, m m b = mass per unit length of the beam, kg/m M = end mass, kg M f = magnifier mass, kg [M t ] = total global mass normalized mass matrix m p = mass per unit length of a single piezo-layer, kg/m m t = mass per unit length of the piezo-beam, kg/m N = total number of finite elements P = output electrical power of the energy harvester, Watt Q 3 = electric charge collected in the piezoelectric layers, coloumb Q 3o = amplitude of the electric charge collected in the piezoelectr...

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Section: Introductionmentioning

confidence: 96%

A Distributed Parameter Cantilevered Piezoelectric Energy Harvester with a Dynamic Magnifier

Aladwani

Aldraihem

Baz

2014

Mechanics of Advanced Materials and Structures

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“…Among those studies, efforts by Frederick [23] and Knight [24] have focused on tuning the frequency of the piezoelectric MEMS device by adjusting the electrical boundary conditions on a portion of the piezoelectric material in the structure. This tuning concept was based on previous studies by Clark [25], Davis et al [26], Lesientre et al [27], Muriuki [28], and Wu et al [29], even though much of this work was done on theoretical or macro scale resonator structures.…”

Section: Introductionmentioning

confidence: 99%

MEMS interdigitated electrode pattern optimization for a unimorph piezoelectric beam

Knight

Clark

2010

J Electroceram

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This paper presents optimization of interdigitated (d 33 ) piezoelectric MEMS unimorph cantilever beams for harvesting vibration energy or for tuning resonators. The analysis of the poling behavior of the piezoelectric material is the key feature. While it is common that simplified models of interdigitated piezoelectric devices assume some uniform and well-defined poling pattern, the finite element modeling used in this work shows that not to be the case. A percent poling factor is developed to investigate the real losses associated with non-uniform poling. A parametric study in terms of electrode patterns, piezoelectric layer dimensions, and electrode dimensions is carried out to examine their effect on the percent poling factor. Design guidelines are provided to help ensure that such piezoelectric MEMS devices are developed to obtain optimum energy harvesting or tuning performance.

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“…Shahruz [10] proposed cantilever arrays, where each cantilever performs optimally at one frequency point, respectively, and the system works within a large frequency band. Wu suggested to adjust the position of the proof-mass manually, thereby turning the resonant frequency of the harvester [15]. The multiple modes of continuous beams may also be utilized for broadband energy harvesting [16].…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric cantilever-pendulum for multi-directional energy harvesting with internal resonance

Xu¹,

Tang²

2015

SPIE Proceedings

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Piezoelectric transducers are widely employed in vibration-based energy harvesting schemes. Simple piezoelectric cantilever for energy harvesting is uni-directional and has bandwidth limitation. In this research we explore utilizing internal resonances to harvest vibratory energy due to excitations from an arbitrary direction with the usage of a single piezoelectric cantilever. Specifically, it is identified that by attaching a pendulum to the piezoelectric cantilever, 1:2 internal resonances can be induced based on the nonlinear coupling. The nonlinear effect induces modal energy exchange between beam bending motion and pendulum motions in 3-dimensional space, which ultimately yield multidirectional energy harvesting by a single cantilever. Systematic analysis and experimental investigation are carried out to demonstrate this new concept.

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Tunable resonant frequency power harvesting devices

Cited by 85 publications

References 0 publications

A Distributed Parameter Cantilevered Piezoelectric Energy Harvester with a Dynamic Magnifier

A Distributed Parameter Cantilevered Piezoelectric Energy Harvester with a Dynamic Magnifier

MEMS interdigitated electrode pattern optimization for a unimorph piezoelectric beam

Piezoelectric cantilever-pendulum for multi-directional energy harvesting with internal resonance

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