Fluid-solid-electric energy transport along piezoelectric flags

Xia, Yifan; Doaré, Olivier; Michelin, Sébastien

doi:10.1080/17797179.2017.1306827

Cited by 3 publications

(3 citation statements)

References 38 publications

(71 reference statements)

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“…The introduced mechanical set-up shows for the first time after the 80-years-old Reut's paper, that a load acting on a fixed line can be made a real and usable condition, thus opening the way to new and unexpected applications, for instance in mechanical actuation or energy harvesting [18], but also in models for locomotion [19], biomechanics [20], and fluid-structure interaction [21], research arenas where flutter instability may play an important role. 2 Elastic double pendulum subject to four different loads of conservative and nonconservative nature A double pendulum is considered, namely, the two-degree-of-freedom rigid and heavy (the rods have unit mass densities ρ 1 , ρ 2 , and ρ 3 ) rods system shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Structures loaded with a force acting along a fixed straight line, or the “Reut’s column problem”

Bigoni

Misseroni

2020

Journal of the Mechanics and Physics of Solids

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An elastic double pendulum subject to a force acting along a fixed straight line, the socalled "Reut's column problem", is a structure exhibiting flutter and divergence instability, which was never realized in practice and thus debated whether to represent reality or mere speculation. It is shown, both theoretically and experimentally, how to obtain the Reut's loading by exploiting the contact with friction of a rigid blade against a freely-rotating cylindrical constraint, which moves axially at constant speed, an action recalling that of a bow's hair on a violin string. With this experimental set-up, flutter and divergence instabilities, as well as the detrimental effect of viscosity on critical loads, are documented indisputably, thus bringing an end to a long debate. This result opens a new research area, with perspective applications to mechanical actuators, high-precision cutting tools, or energy harvesting devices.

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Section: Introductionmentioning

confidence: 99%

Structures loaded with a force acting along a fixed straight line, or the “Reut’s column problem”

Bigoni

Misseroni

2020

Journal of the Mechanics and Physics of Solids

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“…Furthermore, at wind velocity of 10 m s −1 , the maximum power reaches ≈290 μW. Xia et al [ 43 ] numerically described the large amplitude flapping dynamics of a PZT flag immersed in a free‐stream flow, comprising a flexible plate covered by interconnected PZT patches. Their investigations revealed that maximum energy production from their harvester can be achieved when the output resistance is located in close proximity to the end of the flag.…”

Section: Introductionmentioning

confidence: 99%

Flag Fluttering‐Triggered Piezoelectric Energy Harvester at Low Wind Speed Conditions

Özkan,

Erkan,

Basaran

2024

Energy Tech

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Flow‐induced vibrations are common occurrences in various fluid–solid interaction systems existing in nature. One way to transform this vibrational mechanical energy into a usable form is through energy harvesters. This study examines the performance of a piezoelectric energy harvester, where mechanical oscillations result from the fluttering flags made of various fabrics. Flags, made of commonly encountered fabrics, are attached to a cantilever beam inside a wind tunnel with a 30 × 30 cm test section, allowing the airflow to be adjusted between 0 and 10 m s−1. The alpaca flag, with dimensions corresponding to an aspect ratio of 2, can produce meaningful electricity even at a wind speed as low as ≈3.8 m s−1. As the wind speed increases, the fluttering frequency of this flag configuration becomes 10.9 Hz at a wind speed of 5 m s−1, coinciding with the natural frequency of the first mode shape. In this specific arrangement, the structural deformation of the piezoelectric patch on the beam surface is maximized, allowing the harvester system to produce a root mean square voltage of 5 V with a relatively high maximum power of 98 μW.

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“…Fluid-solid-electric coupling in a piezoelectric flag have thus been considered and result in the lock-in of the flapping motion onto the natural frequency of the output electric circuit, which significantly affects their energy harvesting efficiency [33]. Furthermore, continuous circuit models of piezoelectric flags showed some further coupling and organization of the energy transport along the solid and electric systems [34]. The coupling of a flag to a mechanical resonant system through the rotation of its mast also displayed the possibility of lock-in and increased energy transfer [35].…”

Section: Introductionmentioning

confidence: 99%

Flutter and resonances of a flag near a free surface

Mougel

Michelin

2020

Journal of Fluids and Structures

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We investigate the effects of a nearby free surface on the stability of a flexible plate in axial flow. Confinement by rigid boundaries is known to affect flag flutter thresholds and fluttering dynamics significantly, and this work considers the effects of a more general confinement involving a deformable free surface. To this end, a local linear stability is proposed for a flag in axial uniform flow and parallel to a free surface, using one-dimensional beam and potential flow models to revisit this classical fluid-structure interaction problem. The physical behaviour of the confining free surface is characterized by the Froude number, corresponding to the ratio of the incoming flow velocity to that of the gravity waves. After presenting the simplified limit of infinite span (i.e. two-dimensional problem), the results are generalized to include finite-span and lateral confinement effects. In both cases, three unstable regimes are identified for varying Froude number. Rigidly-confined flutter is observed for low Froude number, i.e. when the free surface behaves as a rigid wall, and is equivalent to the classical problem of the confined flag. When the flow and wave velocities are comparable, a new instability is observed before the onset of flutter (i.e. at lower reduced flow speed) and results from the resonance of a structural bending wave and one of the fundamental modes of surface gravity waves. Finally, for large Froude number (low effect of gravity), flutter is observed with significant but passive deformation of the free surface in response of the flag's displacement.

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Fluid-solid-electric energy transport along piezoelectric flags

Cited by 3 publications

References 38 publications

Structures loaded with a force acting along a fixed straight line, or the “Reut’s column problem”

Structures loaded with a force acting along a fixed straight line, or the “Reut’s column problem”

Flag Fluttering‐Triggered Piezoelectric Energy Harvester at Low Wind Speed Conditions

Flutter and resonances of a flag near a free surface

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