Flutter of cantilevered interconnected beams with variable hinge positions

Deivasigamani, Arvind; McCarthy, Jesse; John, Sabu; Watkins, Simon; Trivailo, Pavel M.; Coman, F.

doi:10.1016/j.jfluidstructs.2012.10.011

Cited by 17 publications

(14 citation statements)

References 22 publications

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“…It was also noted that a triangularly shaped leaf caused the greatest power outputs amongst other geometric shapes, though no reasons were given as to why this was the case. Also, it was still unknown what the effects of a hinge had on the dynamics of the system, and so in [42] analytical, experimental and numerical studies were performed in smooth, parallel flow to determine the effects of a hinge, and its span-wise location. It was found that by introducing a hinge into the beam at half-span, the flutter frequency and critical flutter speed were reduced by nearly 50% compared to a uniform beam.…”

Section: Movement-induced Excitation Harvestersmentioning

confidence: 99%

Fluttering energy harvesters in the wind: A review

McCarthy

Watkins

Deivasigamani

et al. 2016

Journal of Sound and Vibration

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144

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The growing area of harvesting energy by aerodynamically-induced flutter in a fluid stream is reviewed. Numerous approaches were found to understand, demonstrate and [sometimes] optimise harvester performance based on Movement-Induced or Extraneously-Induced Excitation. Almost all research was conducted in smooth, unidirectional flow domains; either experimental or computational. The power outputs were found to be very low when compared to conventional wind turbines, but potential advantages could be lower noise levels. A consideration of the likely outdoor environment for fluttering harvesters revealed the flow would be highly turbulent and having a mean flow angle in the horizontal plane that could approach a harvester from any direction. Whilst some multiple harvester systems in smooth, well-aligned flow found enhanced efficiency (due to beneficial wake interaction) this would require an invariant flow approach angle. It was concluded that further work needs to be performed to find a universally accepted metric for efficiency and to understand the effects of the realities of the outdoors, including the highly variable and turbulent flow conditions likely to be experienced.

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Section: Movement-induced Excitation Harvestersmentioning

confidence: 99%

Fluttering energy harvesters in the wind: A review

McCarthy

Watkins

Deivasigamani

et al. 2016

Journal of Sound and Vibration

Self Cite

144

View full text Add to dashboard Cite

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“…Table 1 shows the comparison between the present results and those obtained by Deivasigamani et al (2013). The nondimensional frequency parameter λ i is defined as…”

Section: Numerical Results and Discussionmentioning

confidence: 76%

“…To evaluate the accuracy, the results of this study can be compared with previous investigations. Deivasigamani et al (2013) investigated the flutter of joined beams with constant thickness and variable hinge position. The mechanical properties of the beams are (Deivasigamani et al, 2013)…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…Figure 3 shows the comparison between natural frequencies with varying the hinge position ( η = L 1 /( L 1 + L 2 )). The modal natural frequency ratio, R i , is defined as (Deivasigamani et al, 2013)…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…In the following, a system was tested with a thin steel beam with two piezoelectric patch joints attached to it at the base, along with a rectangular plate, and concluded that adding the plate with revolute hinge to the base beam increased the power output (Bryant et al, 2011a). The influence of the hinge location on the frequency system was investigated by Deivasigamani et al (2013). However, there is no study on the optimized shape of the second beam to increase the output power.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Shape optimization of joined cantilever beams as aeroelastic flutter energy harvester

Shakouri

Outokesh

2019

Wind Engineering

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In this study, flutter frequency of two joined cantilever beams used for energy harvesting has been investigated and optimized. Since there is a strong connection between the output power of the harvester and the system flutter frequency, maximizing flutter frequency increases the output energy significantly. The governing equations are developed using Euler–Bernoulli beam theory, and series method as an analytical approach is used for the solution. The obtained results were compared with the previous investigations, and effects of change in geometrical parameters are studied. The maximum flutter frequency is obtained using shape optimization for the tail beam. It is concluded that the optimized shape of the tail beam with constant length and volume causes significant increase in the flutter frequency, which improves the output power.

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