Bluff body with built‐in piezoelectric cantilever for flow‐induced energy harvesting

Zhang, Min; Hu, Guobiao; Wang, Junlei

doi:10.1002/er.5164

Cited by 34 publications

(9 citation statements)

References 44 publications

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“…Harvesting energy from ubiquitous wind [1][2][3] has been extensively studied for the purpose to power micro-electro-mechanical systems (MEMS) [4][5][6][7][8][9][10][11] in the past decade. The development of wind energy harvesters requires to convert wind energy into structural vibration energy first using various flow-induced vibration mechanisms, [12][13][14][15] such as galloping, [16][17][18] wake galloping, 19,20 flutter 21 and vortex-induced vibration.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of a two‐degree‐of‐freedom galloping energy harvester

Wang

Huang

et al. 2020

Int J Energy Res

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Summary The cut‐in wind speed and the power output are the two main concerns of a galloping energy harvester. A good galloping energy harvester is expected to have a low cut‐in wind speed and a high power output. This paper proposes a two‐degree‐of‐freedom (2‐DOF) galloping‐based piezoelectric energy harvester (GPEH) by mounting a secondary beam onto a primary piezoelectric cantilever beam. An experimental study is conducted to evaluate the actual energy harvesting performance of the proposed 2‐DOF GPEH. The effects of the secondary beam length and the mounting position on the cut‐in wind speed and the power output are investigated. It is revealed that the introduction of the secondary beam can reduce the cut‐in wind speed from 2.372 m/s to 1.961 m/s. Mounting the secondary beam further away from the bluff body weakens the influence of the secondary beam on the energy harvesting performance of the 2‐DOF GPEH. Moreover, the power output can be increased or decreased by tuning the secondary beam length. The power output from a well‐tuned 2‐DOF GPEH can be increased for about 111.1%, as compared to the conventional 1‐DOF GPEH. By contrast, the power output from a badly tuned 2‐DOF GPEH is reduced for about 22.2%. A simple theoretical model is developed for explaining the experimentally observed phenomenon and can be used to provide some guidelines in the design of 2‐DOF GPEH to avoid performance deterioration.

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Section: Introductionmentioning

confidence: 99%

An experimental study of a two‐degree‐of‐freedom galloping energy harvester

Wang

Huang

et al. 2020

Int J Energy Res

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“…Flow-induced vibration (FIV) and biogas are renewable and alternative sources of energy [ 23 , 24 , 25 ]. FIV is a common natural phenomenon, such as vortex-induced vibration of smokestacks and power transmission lines, fluttering flags in airflow, and the flow-induced vibration of seaweed and submarine cables in ocean currents.…”

Section: Introductionmentioning

confidence: 99%

Modeling, Validation, and Performance of Two Tandem Cylinder Piezoelectric Energy Harvesters in Water Flow

et al. 2021

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This paper studies a novel enhanced energy-harvesting method to harvest water flow-induced vibration with a tandem arrangement of two piezoelectric energy harvesters (PEHs) in the direction of flowing water, through simulation modeling and experimental validation. A mathematical model is established by two individual-equivalent single-degree-of-freedom models, coupled with the hydrodynamic force obtained by computational fluid dynamics. Through the simulation analysis, the variation rules of vibration frequency, vibration amplitude, power generation and the distribution of flow field are obtained. And experimental tests are performed to verify the numerical calculation. The experimental and simulation results show that the upstream piezoelectric energy harvester (UPEH) is excited by the vortex-induced vibration, and the maximum value of performance is achieved when the UPEH and the vibration are resonant. As the vortex falls off from the UPEH, the downstream piezoelectric energy harvester (DPEH) generates a responsive beat frequency vibration. Energy-harvesting performance of the DPEH is better than that of the UPEH, especially at high speed flows. The maximum output power of the DPEH (371.7 μW) is 2.56 times of that of the UPEH (145.4 μW), at a specific spacing between the UPEN and the DPEH. Thereupon, the total output power of the two tandem piezoelectric energy harvester systems is significantly greater than that of the common single PEH, which provides a good foreground for further exploration of multiple piezoelectric energy harvesters system.

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“…Different from a windmill, the size of a wind energy harvester is often required to be compact to meet the miniaturisation requirement of MEMS. Hence, instead of rotary turbine design, small scale wind energy harvesters are often designed based on flow-induced vibration mechanisms and phenomena, including galloping (Ali et al, 2013;Barrero-Gil et al, 2010;Sirohi and Mahadik, 2012), vortex-induced vibration (VIV) (Wang et al, 2019a;Zhang et al, 2020), wake galloping (Liu et al, 2020;Yan et al, 2020) and flutter (Eugeni et al, 2020). Since galloping can lead to the self-excited vibration around the natural frequency of the system, the consequent limit cycle motion near resonance has a large oscillation amplitude.…”

Section: Introductionmentioning

confidence: 99%

Improved theoretical analysis and design guidelines of a two-degree-of-freedom galloping piezoelectric energy harvester

Hu¹,

Liang²,

Tang³

et al. 2021

Journal of Intelligent Material Systems and Structures

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This paper presents an improved analysis of a two-degree-of-freedom (2DOF) galloping-based piezoelectric energy harvester (GPEH). First, an overview of the 2DOF GPEH, together with some discussions on its physical implementation, are presented. The theoretical model of the 2DOF GPEH is then developed. The analytical solutions are derived using the harmonic balance method. The dynamic behaviour of the 2DOF GPEH is predicted according to the solution characteristics. Moreover, the mode activation mechanism of the 2DOF GPEH is theoretically unveiled: depending on the system parameters; there may exist a single or multiple stable solutions which correspond to different vibration modes of the 2DOF GPEH. Subsequently, an equivalent circuit model of the 2DOF GPEH is established. Circuit simulations are performed to verify the analytical solutions. Case studies through detailed theoretical analysis and circuit simulation give in-depth insights into the dynamic behaviour of the 2DOF GPEH. It is demonstrated that by tuning the stiffness of the auxiliary oscillator, either the first or the second mode vibration of the 2DOF GPEH can be activated, resulting in completely different dynamic behaviours and energy harvesting performance. Finally, from the perspectives of reducing the cut-in wind speed and improving the voltage output, several design guidelines are provided.

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Bluff body with built‐in piezoelectric cantilever for flow‐induced energy harvesting

Cited by 34 publications

References 44 publications

An experimental study of a two‐degree‐of‐freedom galloping energy harvester

An experimental study of a two‐degree‐of‐freedom galloping energy harvester

Modeling, Validation, and Performance of Two Tandem Cylinder Piezoelectric Energy Harvesters in Water Flow

Improved theoretical analysis and design guidelines of a two-degree-of-freedom galloping piezoelectric energy harvester

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