Comparative study between the pillar- and bulk-type multilayer structures for piezoelectric energy harvesters

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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Fabrication of PVDF/BaTiO3/CNT Piezoelectric Energy Harvesters with Bionic Balsa Wood Structures through 3D Printing and Supercritical Carbon Dioxide Foaming

ACS Applied Materials & Interfaces ◽

10.1021/acsami.1c11843 ◽

2021 ◽

Author(s):

Cheng Yang ◽

Shiping Song ◽

Fang Chen ◽

Ning Chen

Keyword(s):

Carbon Dioxide ◽

3D Printing ◽

Supercritical Carbon Dioxide ◽

Wood Structures ◽

Balsa Wood ◽

Energy Harvesters ◽

Piezoelectric Energy ◽

Supercritical Carbon

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Fabrication and characterization of low temperature sintered hard piezoelectric ceramics for multilayer piezoelectric energy harvesters

Ceramics International ◽

10.1016/j.ceramint.2021.02.239 ◽

2021 ◽

Author(s):

Intae Seo ◽

Sora Jo ◽

Dae Su Kim ◽

Hyung-Won Kang ◽

Sahn Nahm ◽

...

Keyword(s):

Low Temperature ◽

Piezoelectric Ceramics ◽

Energy Harvesters ◽

Piezoelectric Energy ◽

Fabrication And Characterization

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Load Resistance Optimization of a Broadband Bistable Piezoelectric Energy Harvester for Primary Harmonic and Subharmonic Behaviors

Sustainability ◽

10.3390/su13052865 ◽

2021 ◽

Vol 13 (5) ◽

pp. 2865 ◽

Cited By ~ 1

Author(s):

Sungryong Bae ◽

Pilkee Kim

Keyword(s):

Energy Harvester ◽

Load Resistance ◽

Oscillation Period ◽

Ambient Vibration ◽

Ambient Vibrations ◽

Frequency Dependency ◽

Energy Harvesters ◽

Piezoelectric Energy ◽

Optimal Load ◽

Bistable Energy Harvester

In this study, optimization of the external load resistance of a piezoelectric bistable energy harvester was performed for primary harmonic (period-1T) and subharmonic (period-3T) interwell motions. The analytical expression of the optimal load resistance was derived, based on the spectral analyses of the interwell motions, and evaluated. The analytical results are in excellent agreement with the numerical ones. A parametric study shows that the optimal load resistance depended on the forcing frequency, but not the intensity of the ambient vibration. Additionally, it was found that the optimal resistance for the period-3T interwell motion tended to be approximately three times larger than that for the period-1T interwell motion, which means that the optimal resistance was directly affected by the oscillation frequency (or oscillation period) of the motion rather than the forcing frequency. For broadband energy harvesting applications, the subharmonic interwell motion is also useful, in addition to the primary harmonic interwell motion. In designing such piezoelectric bistable energy harvesters, the frequency dependency of the optimal load resistance should be considered properly depending on ambient vibrations.

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Power Density Improvement of Piezoelectric Energy Harvesters via a Novel Hybridization Scheme with Electromagnetic Transduction

Micromachines ◽

10.3390/mi12070803 ◽

2021 ◽

Vol 12 (7) ◽

pp. 803

Author(s):

Zhongjie Li ◽

Chuanfu Xin ◽

Yan Peng ◽

Min Wang ◽

Jun Luo ◽

...

Keyword(s):

Power Density ◽

Output Power ◽

Energy Harvester ◽

Hybrid Energy ◽

Energy Harvesters ◽

Piezoelectric Patch ◽

Piezoelectric Energy ◽

Electromagnetic Transduction ◽

Self Powered ◽

Power Densities

A novel hybridization scheme is proposed with electromagnetic transduction to improve the power density of piezoelectric energy harvester (PEH) in this paper. Based on the basic cantilever piezoelectric energy harvester (BC-PEH) composed of a mass block, a piezoelectric patch, and a cantilever beam, we replaced the mass block by a magnet array and added a coil array to form the hybrid energy harvester. To enhance the output power of the electromagnetic energy harvester (EMEH), we utilized an alternating magnet array. Then, to compare the power density of the hybrid harvester and BC-PEH, the experiments of output power were conducted. According to the experimental results, the power densities of the hybrid harvester and BC-PEH are, respectively, 3.53 mW/cm3 and 5.14 μW/cm3 under the conditions of 18.6 Hz and 0.3 g. Therefore, the power density of the hybrid harvester is 686 times as high as that of the BC-PEH, which verified the power density improvement of PEH via a hybridization scheme with EMEH. Additionally, the hybrid harvester exhibits better performance for charging capacitors, such as charging a 2.2 mF capacitor to 8 V within 17 s. It is of great significance to further develop self-powered devices.

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Multimodal pizza-shaped piezoelectric vibration-based energy harvesters

Journal of Intelligent Material Systems and Structures ◽

10.1177/1045389x211006910 ◽

2021 ◽

pp. 1045389X2110069

Author(s):

Virgilio J Caetano ◽

Marcelo A Savi

Keyword(s):

Energy Harvesting ◽

Frequency Spectrum ◽

Optimization Procedure ◽

Single Mode ◽

Ambient Vibration ◽

Vibration Source ◽

Element Analysis ◽

Energy Harvesters ◽

Piezoelectric Energy ◽

Harvesting Systems

Energy harvesting from ambient vibration through piezoelectric devices has received a lot of attention in recent years from both academia and industry. One of the main challenges is to develop devices capable of adapting to diverse sources of environmental excitation, being able to efficiently operate over a broadband frequency spectrum. This work proposes a novel multimodal design of a piezoelectric energy harvesting system to harness energy from a wideband ambient vibration source. Circular-shaped and pizza-shaped designs are employed as candidates for the device, comparing their performance with classical beam-shaped devices. Finite element analysis is employed to model system dynamics using ANSYS Workbench. An optimization procedure is applied to the system aiming to seek a configuration that can extract energy from a broader frequency spectrum and maximize its output power. A comparative analysis with conventional energy harvesting systems is performed. Numerical simulations are carried out to investigate the harvester performances under harmonic and random excitations. Results show that the proposed multimodal harvester has potential to harness energy from broadband ambient vibration sources presenting performance advantages in comparison to conventional single-mode energy harvesters.

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