Modeling and Optimization of a Vortex Induced Vibration Fluid Kinetic Energy Harvester

Wen, Quan; Schulze, Robert; Billep, Detlef; Otto, Thomas; Geßner, Thomas

doi:10.1016/j.proeng.2014.11.656

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…(1) .In this study, our main purpose is to get maximum power. Maximum dimension was found for this purpose since it is directly interrelated with the length of energy harvester [20] .Since, it is compulsory for the energy harvester to vibrate in the first harmonic mode so it should follow a certain ratio as explained in [21] and this is presented in Eq. (2).…”

Section: Analytical Model Geometry Modelling and Boundary Conditionsmentioning

confidence: 99%

Sensitivity analysis for piezoelectric energy harvester and bluff body design toward underwater pipeline monitoring

Qureshi

Muhtaroğlu

Tuncay

2017

Journal of Energy Systems

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Monitoring of underwater pipelines through wireless sensor nodes (WSNs) is an important area of research especially for locations such as underground or underwater pipelines, where it is costly to replace batteries. In this study, a finite element sensitivity and comparative analysis for piezoelectric (PZT) energy harvester operating in a fluid flow is done to power underwater in-pipe WSNs. Two types of bluff bodies D and I-shaped are used for comparison. Finite element simulations results show that PZT energy harvester having I-shaped bluff body produces 2.24 mW, while energy harvester having Dshaped bluff body has the capacity to produce only 0.82 mW of power. I-shaped bluff body have significant impact on the performance of pipe and it introduces 6 times more head loss than D-shaped bluff body to maintain regular flow of pipe for the same fluid domain. It is concluded from the analysis that 12 PZT cantilevers in parallel arrangement are needed to maintain 4096 bits per second (bps) transmission of 512-Byte data packet once per 5 minutes with the piezoelectric harvester, using an integrated 7.1 J super capacitor that can fit into the bluff body together with the power electronics and acoustic transceiver.

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Section: Analytical Model Geometry Modelling and Boundary Conditionsmentioning

confidence: 99%

Sensitivity analysis for piezoelectric energy harvester and bluff body design toward underwater pipeline monitoring

Qureshi

Muhtaroğlu

Tuncay

2017

Journal of Energy Systems

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“…Piezoelectric harvesters can convert the energy of liquids and air to electrical power. For this purpose, various methods with different configurations have been proposed in the literature 7,8 ; such as energy harvesting from vortex-induced vibrations, [9][10][11][12] fluttering, [13][14][15][16] turbulent-induced vibrations, [17][18][19] galloping oscillations, 20 and small-scale wind and water turbines. [21][22][23][24][25][26][27] An energy harvesting system coupled with rotational motions is another topology that can produce electric energy, monitor rotary equipment conditions, 28 and be employed in flow rate and velocity sensors.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and analysis of an exponentially tapered piezoelectric energy harvester under nonlinear rotational indirect magnetic excitation

Jafari,

Fakhari Golpayegani

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Piezoelectric energy harvesting from rotational motions currently receives attention as a clean and permanent energy source. However, because of low output power, optimizing and improving the efficiency of this strategy through different methods is of great importance. This study investigates a new high-efficiency piezoelectric energy harvester under rotational indirect magnetic excitation using frequency up-conversion. The studied piezoelectric energy harvester is composed of an exponentially tapered cantilever beam with a piezoelectric layer, excited magnets, a tip mass, an octagonal disk attached to the rotating shaft, and exciting magnets on the disk. The potential energy and nonlinear magnetic force are determined and substituted into an electromechanically coupled governing equation after derivation. Numerical methods are applied to solve the governing equations due to their nonlinear nature and periodic oscillations. The tip mass varies to maintain a constant natural frequency and cancel out the effect of concurrent variations of the natural frequency and tapering parameter. Verification of the theoretical model is performed by the finite element and experiment methods. The effects of some parameters, such as the tapering parameter, total resistance of the circuit, number of magnets, and rotational speed, on the output voltage and power densities are evaluated. Results show a fourfold increase in output power density when comparing exponentially tapered width to constant width. Finally, frequency response curves are plotted and analyzed to examine the effect of shaft rotational speed, subharmonics, and bandwidth. The most important result extracted from the frequency response diagram is the increase in the number of subharmonics and the observation of 2 ω/5 and 2 ω/7 subharmonic components in the frequency response of the harvester with exponentially tapered width.

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“…When coupled to an energy harvester, this oscillating motion of the structure is converted to electric energy. Wen et al (2014) utilized a VIV based energy harvester using a cuboidal bluff body and a piezoelectric cantilever beam placed in the wake region. They recorded power of 1 µW at an airflow velocity of 2 m/s, corresponding to an eigen frequency of 5 Hz for the cantilever beam.…”

Section: Introductionmentioning

confidence: 99%

Energy harvesting from cavity flow oscillations

Thangamani

Kok

2021

Journal of Intelligent Material Systems and Structures

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This study investigates the energy harvesting prospects of self-sustained flow oscillations emanating from grazing flow over a rectangular cavity by employing experimental and computational methods. Two cavity geometries with length-to-depth ratios of 2 and 3, exposed to an incoming flow of 30 m/s, were selected for the purpose. The power spectral density of the baseline cavity flows showed the presence of high-amplitude peaks whose frequencies agreed to those estimated from Rossiter’s feedback model. For energy harvesting, a piezoelectric beam was placed perpendicular to the aft wall and its natural frequency tuned to match closely with the dominant frequencies of the cavity flow oscillations. From the experiments, an average and maximum instantaneous power of 21.11 and 284.18 µW was recorded for the cavity with L/ D = 2 whereas for the cavity with L/ D = 3 the corresponding values were 32.16 and 403.46 µW respectively. Time-frequency analysis showed the forcing of the beam at the cavity oscillation frequency and the substantial increase in the amplitude of beam vibrations when this frequency was close to the natural frequency of the beam.

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Modeling and Optimization of a Vortex Induced Vibration Fluid Kinetic Energy Harvester

Cited by 9 publications

References 5 publications

Sensitivity analysis for piezoelectric energy harvester and bluff body design toward underwater pipeline monitoring

Sensitivity analysis for piezoelectric energy harvester and bluff body design toward underwater pipeline monitoring

Design and analysis of an exponentially tapered piezoelectric energy harvester under nonlinear rotational indirect magnetic excitation

Energy harvesting from cavity flow oscillations

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