A High Precision Lumped Parameter Model for Piezoelectric Energy Harvesters

Piezoelectric energy harvesters have great potential for achieving inexhaustible power supply for small-scale electronic devices. However, the insufficient power-generation capability and the narrow working bandwidth of traditional energy harvesters have significantly hindered their adoption. To address these issues, we propose a nonlinear compressive-mode piezoelectric energy harvester. We embedded a multi-stage force amplification mechanism into the energy harvester, which greatly improved its power-generation capability. In this article, we describe how we first established an analytical model to study the force amplification effect. A lumped-parameter model was then built to simulate the strong nonlinear responses of the proposed energy harvester. A prototype was fabricated which demonstrated a superior power output of 30 mW under an excitation of 0.3 g ([Formula: see text] m/s2). We discuss at the end the effect of geometric parameters that are influential to the performance. The proposed energy harvester is suitable to be used in low-frequency weak-excitation environments for powering wireless sensors.

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Tuning the hygro-mechanical response of paper-based systems using glycerol

Journal of Intelligent Material Systems and Structures ◽

10.1177/1045389x20947167 ◽

2020 ◽

pp. 1045389X2094716

Author(s):

Isaias Cueva-Perez ◽

Roque Alfredo Osornio-Rios ◽

Aurelio Dominguez-Gonzalez ◽

Ion Stiharu ◽

Angel Perez-Cruz

Keyword(s):

Dynamic Response ◽

Resonance Frequency ◽

Mechanical Response ◽

Water Solution ◽

Low Cost ◽

Mechanical Systems ◽

Lumped Parameter Model ◽

Glycerol Water ◽

Energy Harvesters ◽

Lumped Parameter

In recent years, the need for portable, low-cost, and eco-friendly devices for testing and monitoring has arisen. Paper-based devices have emerged as a response to these needs due to the properties induced by capillarity, flexibility, disposability, and biodegradability. In this work, the authors explored the possibility of tuning the hygro-mechanical response of paper-based cantilever beams using glycerol. A lumped-parameter model with non-linear stiffness is used to describe the dynamic response of the beams using three parameters. An experimental method based on resonance frequency tests is used to study the influence of glycerol on the dynamic response of four different beam configurations. The obtained results demonstrate that the resonance frequency of paper-based mechanical systems can be easily tuned by the imbibition of a glycerol–water solution. This study could lead to the development of tunable paper-based mechanical systems for specific applications such as energy harvesters and hygro-mechanical-based sensors.

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An Improved Lumped Parameter Model for a Piezoelectric Energy Harvester in Transverse Vibration

Shock and Vibration ◽

10.1155/2014/935298 ◽

2014 ◽

Vol 2014 ◽

pp. 1-12 ◽

Cited By ~ 6

Author(s):

Guang-qing Wang ◽

Yue-ming Lu

Keyword(s):

Correction Factor ◽

Transverse Vibration ◽

Energy Harvester ◽

Lumped Parameter Model ◽

Distributed Parameter ◽

Piezoelectric Energy ◽

Distributed Parameter Model ◽

Lumped Parameter ◽

Lumped Parameter Models ◽

Tip Mass

An improved lumped parameter model (ILPM) is proposed which predicts the output characteristics of a piezoelectric vibration energy harvester (PVEH). A correction factor is derived for improving the precisions of lumped parameter models for transverse vibration, by considering the dynamic mode shape and the strain distribution of the PVEH. For a tip mass, variations of the correction factor with PVEH length are presented with curve fitting from numerical solutions. The improved governing motion equations and exact analytical solution of the PVEH excited by persistent base motions are developed. Steady-state electrical and mechanical response expressions are derived for arbitrary frequency excitations. Effects of the structural parameters on the electromechanical outputs of the PVEH and important characteristics of the PVEH, such as short-circuit and open-circuit behaviors, are analyzed numerically in detail. Accuracy of the output performances of the ILPM is identified from the available lumped parameter models and the coupled distributed parameter model. Good agreement is found between the analytical results of the ILPM and the coupled distributed parameter model. The results demonstrate the feasibility of the ILPM as a simple and effective means for enhancing the predictions of the PVEH.

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An asymmetric magnetic-coupled bending-torsion piezoelectric energy harvester: modeling and experimental investigation

Smart Materials and Structures ◽

10.1088/1361-665x/ac3c04 ◽

2021 ◽

Author(s):

Huirong Zhang ◽

Wentao Sui ◽

Chongqiu Yang ◽

Leian Zhang ◽

Rujun Song ◽

...

Keyword(s):

Energy Harvester ◽

Average Power ◽

Harmonic Excitation ◽

Lumped Parameter Model ◽

Distributed Parameter ◽

Piezoelectric Energy ◽

Distributed Parameter Model ◽

Piezoelectric Beam ◽

Lumped Parameter ◽

Torsion Energy

Abstract This paper presents a detailed investigation on an asymmetric magnetic-coupled bending-torsion piezoelectric energy harvester based on harmonic excitation. There is an eccentricity between the shape center of moving magnets and the axis of the piezoelectric beam, which results in the bending and torsion simultaneously in working condition. The distributed mathematical model is derived from the energy method to describe the dynamic characteristics of the harvester, and the correctness of the model is verified by experiments. To further demonstrate the improvement performance of the proposed energy harvester, the bending-torsion energy harvester (i.e. magnetic-coupled was not configured) is experimented and compared. The theoretical and experimental results indicate that the average power increases about 300% but the resonance frequency decreases approximately 2 Hz comparing to the harvester without magnetic-coupled. According to the characteristic of distributed parameter model, the magnetic force and the size of the piezoelectric beam are investigated respectively. And the lumped-parameter model is introduced to analyze the steady-state characteristic. Accordingly, this paper provides a feasible method to improve performance for piezoelectric energy harvester.

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Comparative Study of Piezoelectric Vortex-Induced Vibration-Based Energy Harvesters with Multi-Stability Characteristics

Energies ◽

10.3390/en13010071 ◽

2019 ◽

Vol 13 (1) ◽

pp. 71 ◽

Cited By ~ 5

Author(s):

Rashid Naseer ◽

Huliang Dai ◽

Abdessattar Abdelkefi ◽

Lin Wang

Keyword(s):

Comparative Study ◽

Performance Optimization ◽

Load Resistance ◽

Lumped Parameter Model ◽

Vortex Induced Vibration ◽

Energy Harvesters ◽

Softening Behavior ◽

Piezoelectric Energy ◽

Synchronization Region ◽

Spacing Distance

This work reports a comparative study on piezoelectric energy harvesting from vortex-induced vibration (VIV) with multi-stability characteristics by introducing the nonlinear magnetic forces. A lumped-parameter model for the piezoelectric cantilever-cylinder structure is considered for the sake of qualitative investigation. Firstly, the buckling displacement of harvester in monostable and bistable configurations is evaluated by virtue of a static analysis. Then, the coupled frequency and damping of the harvester varying with the electrical load resistance are determined for different values of the spacing distance between magnets. Subsequently, the dynamic behaviors and generated voltage of the harvester in two configurations are elaborately investigated, showing that varying the spacing distance is followed by a shift of lock-in region which is significant for performance optimization according to ambient wind conditions. In addition, the results show the harvester in monostable configuration displays a hardening behavior while a softening behavior takes place in bistable configuration, both of the harvester in two configurations can widen the synchronization region.

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