Tree-inspired piezoelectric energy harvesting

Hobbs, William B.; Hu, David L.

doi:10.1016/j.jfluidstructs.2011.08.005

Cited by 94 publications

(44 citation statements)

References 35 publications

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“…When self-induced oscillations occur, a combination of pitching and heaving motions are excited and mechanical energy is extracted from the heaving motion through the damper (which represents the energy generator). With such a design, the system is similar to other self-started oscillatory energy harvesting systems proposed recently (Bernistas et al, 2008;Dunnmon et al, 2011;Hobbs and Hu, 2012;Singh et al, 2012).…”

Section: Introductionmentioning

confidence: 85%

Energy harvesting by a purely passive flapping foil from shear flows

Zhu

2012

Journal of Fluids and Structures

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Section: Introductionmentioning

confidence: 85%

Energy harvesting by a purely passive flapping foil from shear flows

Zhu

2012

Journal of Fluids and Structures

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“…Hobbs and Hu presented a tree-inspired design for vortex-induced vibration harvesting [7]. While both [6,7] have a similar design concept to the harvester presented in this paper, the form of excitation used to estimate power output is appropriate for either bulk fluid motion or vortex-induced vibration rather than for TIV.…”

Section: Existing Fluid Flow Harvesting Methodsmentioning

confidence: 99%

Artificial piezoelectric grass for energy harvesting from turbulence-induced vibration

Hobeck¹,

Inman²

2012

Smart Mater. Struct.

128

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The primary objective of this research is to develop a deploy-and-forget energy harvesting device for use in low-velocity, highly turbulent fluid flow environments i.e. streams or ventilation systems. The work presented here focuses on a novel, lightweight, highly robust, energy harvester design referred to as piezoelectric grass. This biologically inspired design consists of an array of cantilevers, each constructed with piezoelectric material. When exposed to proper turbulent flow conditions, these cantilevers experience vigorous vibrations. Preliminary results have shown that a small array of piezoelectric grass was able to produce up to 1.0 mW per cantilever in high-intensity turbulent flow having a mean velocity of 11.5 m s −1. According to the literature, this is among the highest output achieved using similar harvesting methods. A distributed parameter model for energy harvesting from turbulence-induced vibration will be introduced and experimentally validated. This model is generalized for the case of a single cantilever in turbulent cross-flow. Two high-sensitivity pressure probes were needed to perform spectral measurements within various turbulent flows. The design and performance of these probes along with calibration and measurement techniques will be discussed.

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“…The fourth configuration was reported to produce the maximum power. Hobbs and Hu (2012) experimentally investigated energy extraction from a linear array of four cylinders. Each cylinder was attached to a piezoelectric energy transducer.…”

Section: Introductionmentioning

confidence: 99%

Harnessing electrical power from vortex-induced vibration of a circular cylinder

Soti

Thompson

Sheridan

et al. 2017

Journal of Fluids and Structures

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Renewable energy sources are likely to become essential due to continuously increasing energy demands together with the depletion of natural resources that are currently used for power generation, such as coal and gas. They are also advantageous in terms of their reduced environmental impact. Here, the generation of electrical power from VortexInduced Vibration (VIV) of a cylinder is investigated numerically. The cylinder is free to oscillate in the direction transverse to the incoming flow. The cylinder is attached to a magnet that can move along the axis of a coil made from conducting wire. The magnet and the coil together constitute a basic electrical generator. When the cylinder undergoes VIV, the motion of the magnet creates a voltage across the coil, which is connected to a resistive load. By Lenz's law, induced current in the coil applies a retarding force to the magnet. Effectively, the electrical generator applies a damping force on the cylinder with a spatially varying damping coefficient. For the initial investigation reported here, the Reynolds number is restricted to Re ≤ 200, so that the flow is laminar and two-dimensional (2D). The incompressible 2D Navier-Stokes equations are solved using an extensively validated spectral-element based solver. The effects of the electromagnetic (EM) damping constant ξ m , coil dimensions (radius a, length L), and mass ratio on the electrical power extracted are quantified. It is found that there is an optimal value of ξ m (ξ opt ) at which maximum electrical power is generated. As the radius or length of the coil is increased, the value of ξ opt is observed to increase. Although the maximum average power remains the same, a larger coil radius or length results in a more robust system in the sense that a relatively large amount of power can be extracted when ξ m is far from ξ opt , unlike the constant damping ratio case. The average power output is also a function of Reynolds number, primarily through the increased maximum oscillation amplitude that occurs with increased Reynolds number at least within the laminar range, although the general qualitative findings seem likely to carry across to high Reynolds number VIV.

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Tree-inspired piezoelectric energy harvesting

Cited by 94 publications

References 35 publications

Energy harvesting by a purely passive flapping foil from shear flows

Energy harvesting by a purely passive flapping foil from shear flows

Artificial piezoelectric grass for energy harvesting from turbulence-induced vibration

Harnessing electrical power from vortex-induced vibration of a circular cylinder

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