DEAP-based energy harvesting using vortex-induced vibrations

2014 ◽  
Author(s):  
Thorben Hoffstadt ◽  
Robert Heinze ◽  
Tim Wahl ◽  
Frank Kameier ◽  
Jürgen Maas
Keyword(s):  
Energy Harvesting ◽  
Vortex Induced Vibrations

scholarly journals On the efficiency of energy harvesting using vortex-induced vibrations of cables

2014 ◽  
Vol 49 ◽  
pp. 427-440 ◽  
Author(s):  
Clément Grouthier ◽  
Sébastien Michelin ◽  
Rémi Bourguet ◽  
Yahya Modarres-Sadeghi ◽  
Emmanuel de Langre
Keyword(s):  
Energy Harvesting ◽  
Vortex Induced Vibrations

scholarly journals Modeling of Piezoelectric Energy Harvesting from Freely Oscillating Cylinders in Water Flow

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Min Zhang ◽  
YingZheng Liu ◽  
ZhaoMin Cao
Keyword(s):  
Energy Harvesting ◽  
Free Stream ◽  
Piezoelectric Materials ◽  
Load Resistance ◽  
Stream Velocity ◽  
Piezoelectric Energy Harvesting ◽  
Vibratory System ◽  
System Parameters ◽  
Piezoelectric Energy ◽  
Vortex Induced Vibrations

A concept of energy harvesting from vortex-induced vibrations of a rigid circular cylinder with two piezoelectric beams attached is investigated. The variations of the power levels with the free stream velocity are determined. A mathematical approach including the coupled cylinder motion and harvested voltage is presented. The effects of the load resistance, piezoelectric materials, and circuit combined on the natural frequency and damping of the vibratory system are determined by performing a linear analysis. The dynamic response of the cylinder and harvested energy are investigated. The results show that the harvested level in SS and SP&PS modes is the same with different values of load resistance. For four different system parameters, the results show that the bigger size of cylinder with PZT beams can obtain the higher harvested power.

scholarly journals Optimal energy harvesting from vortex-induced vibrations of cables

2016 ◽  
Vol 472 (2195) ◽  
pp. 20160583 ◽  
Author(s):  
G. O. Antoine ◽  
E. de Langre ◽  
S. Michelin
Keyword(s):  
Energy Harvesting ◽  
Flow Velocity ◽  
Passive Control ◽  
Optimal Harvesting ◽  
Control Mechanisms ◽  
Wake Oscillator ◽  
Vortex Induced Vibrations ◽  
Harvesting Systems ◽  
Gradient Based ◽  
Flexible Cables

Vortex-induced vibrations (VIV) of flexible cables are an example of flow-induced vibrations that can act as energy harvesting systems by converting energy associated with the spontaneous cable motion into electricity. This work investigates the optimal positioning of the harvesting devices along the cable, using numerical simulations with a wake oscillator model to describe the unsteady flow forcing. Using classical gradient-based optimization, the optimal harvesting strategy is determined for the generic configuration of a flexible cable fixed at both ends, including the effect of flow forces and gravity on the cable’s geometry. The optimal strategy is found to consist systematically in a concentration of the harvesting devices at one of the cable’s ends, relying on deformation waves along the cable to carry the energy towards this harvesting site. Furthermore, we show that the performance of systems based on VIV of flexible cables is significantly more robust to flow velocity variations, in comparison with a rigid cylinder device. This results from two passive control mechanisms inherent to the cable geometry: (i) the adaptability to the flow velocity of the fundamental frequencies of cables through the flow-induced tension and (ii) the selection of successive vibration modes by the flow velocity for cables with gravity-induced tension.

scholarly journals Experimental Study on Piezoelectric Energy Harvesting from Vortex-Induced Vibrations and Wake-Induced Vibrations

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Min Zhang ◽  
Junlei Wang
Keyword(s):  
Energy Harvesting ◽  
Output Voltage ◽  
Maximum Output Power ◽  
Load Resistance ◽  
Maximum Output ◽  
Piezoelectric Energy ◽  
Vortex Induced Vibrations ◽  
Flow Induced Vibrations ◽  
Generation Capacity ◽  
Output Characteristics

A rigid circular cylinder with two piezoelectric beams attached on has been tested through vortex-induced vibrations (VIV) and wake-induced vibrations (WIV) by installing a big cylinder fixed upstream, in order to study the influence of the different flow-induced vibrations (FIV) types. The VIV test shows that the output voltage increases with the increases of load resistance; an optimal load resistance exists for the maximum output power. The WIV test shows that the vibration of the small cylinder is controlled by the vortex frequency of the large one. There is an optimal gap of the cylinders that can obtain the maximum output voltage and power. For a same energy harvesting device, WIV has higher power generation capacity; then the piezoelectric output characteristics can be effectively improved.

Piezoelectric energy harvesting from vortex-induced vibrations of circular cylinder

2013 ◽  
Vol 332 (19) ◽  
pp. 4656-4667 ◽  
Author(s):  
A. Mehmood ◽  
A. Abdelkefi ◽  
M.R. Hajj ◽  
A.H. Nayfeh ◽  
I. Akhtar ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Circular Cylinder ◽  
Piezoelectric Energy Harvesting ◽  
Piezoelectric Energy ◽  
Vortex Induced Vibrations

scholarly journals Optimal Energy Harvesting From Vortex-Induced Vibrations of Cables

2016 ◽  
Author(s):  
Guillaume O. Antoine ◽  
Sébastien Michelin ◽  
Emmanuel de Langre
Keyword(s):  
Energy Harvesting ◽  
Equation Of Motion ◽  
Complex Geometries ◽  
Wake Oscillator ◽  
Flow Fluctuations ◽  
Rigid Rods ◽  
Vortex Induced Vibrations ◽  
Numerical Tools ◽  
Carry Over ◽  
Flexible Cables

We propose to use flexible cables instead of rigid rods in devices extracting energy from Vortex-Induced Vibrations (VIVs). We use a linear equation of motion for the structure coupled with a nonlinear wake oscillator and numerical tools to simulate the VIVs of hanging strings/cables. While extracting energy from the VIVs of a straight cable with a harvester attached to one of its ends is as efficient as extracting energy from the VIVs of rigid structures, we find that the former is much more robust to flow fluctuations than the latter. We finally show that those results carry over to more complex geometries (e.g. catenary).

Energy Harvesting by Vortex-Induced Vibrations in Slender Structures

2013 ◽  
Author(s):  
Clement Grouthier ◽  
Sebastien Michelin ◽  
Emmanuel de Langre
Keyword(s):  
Energy Harvesting ◽  
Bluff Body ◽  
Travelling Waves ◽  
Analytical Calculation ◽  
Good Tool ◽  
Strongly Coupled ◽  
Wake Oscillator ◽  
Vortex Induced Vibrations ◽  
Optimal Efficiency ◽  
Slender Structures

Vortex-induced vibrations (VIV) are self-sustained oscillations of an immerged bluff body strongly coupled with its fluctuating wake. In this paper, energy harvesting by VIV of slender structures is investigated using a wake-oscillator model. The generic case of an infinitely long tensioned cable with periodically distributed harvesters is first investigated. The linear stability analysis of the model is a good tool to understand the strong influence of the different harvesting parameters on the efficiency. As the achieved efficiency is rather high, VIV seem promising as a mechanism for energy harvesting. The more realistic case of a hanging string with a single energy harvesting device at its upper extremity is thus considered. The optimal efficiency is still rather high, travelling waves develop towards the harvester when parameters are in the efficient region of the parameter space, which is identified thanks to a forced analytical calculation.

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