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Assessment of the role of structural nonlinearity in galloping energy harvesters

Sarbinowski Filip, Starosta Roman

Vibrations in Physical Systems

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2021

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Vol. 32, nr 2

art. no. 2021209

EN

The study compares different variants of aeroelastic energy harvesters due to the power they generate. For this purpose, models of devices with different stiffness characteristics were prepared: linear, nonlinear, with combined stiffness and bistable. Then, using the authorial procedure, analytical expressions that describe the power of each system were determined and the influence of individual parameters on this quantity was examined. By way of optimization, the system parameters have been selected in such a way that, regardless of the flow velocity, each of them generates the maximum possible power. Based on the results obtained in this way, the advisability of using a device with combined stiffness and bistable characteristics was rejected. Moreover, it was pointed out that the linear system would provide greater efficiency for lower flow velocities.

2

Modelling dynamics of transmission conductors with Cosserat rod

Xiong H., Li Z. L., Chang J., You L., Zhang J. J., Wang M.

Computer Assisted Methods in Engineering and Science

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2013

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Vol. 20, no. 1

73--79

EN

We proposed a method to analyze the galloping, a vibration by wind force, of transmission conductors. The Cosserat rod model was introduced to describe the motion of the conductor line. The deformation was tracked using the intrinsic framework of material coordinates which are able to handle the large motion in galloping phenomena. The Cosserat model provided a theory framework to simulate the non-linear coupling of the torsional motion and the translational motion. Such non-linear coupling was reported as one of the main causes for the galloping phenomena.

3

Fale w przewodach elektroenergetycznych wywołane wiatrem i deszczem

Snamina J.

Czasopismo Techniczne. Mechanika

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2004

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R. 101, z. 5-M

355--362

PL

W niniejszej pracy przedstawiono analizę zjawiska galopingu przewodów wywołanego deszczem i wiatrem. Obciążenia związane z oddziaływaniem wiatru wyznaczono na podstawie opublikowanych wyników doświadczeń aerodynamicznych. Obliczenia dotyczą długich przewodów, w związku z tym w równaniach amplitud uwzględniono wpływ krzywizny i naciągu, które są wolnozmiennymi funkcjami współrzędnej łukowej. Celem obliczeń jest określenie wpływu oddziaływań aerodynamicznych na amplitudy sprzężonych fal. Wyniki rozważań zilustrowano przykładami numerycznymi.

EN

The paper presents an analysis of wind and rain induced galloping observed in long cable. Based on measured data for drag and lift coefficients published in reports, the aerodynamic loading was determined. The general equations of the cable motion including the space-varying parameters of the equilibrium line, such as the curvature and tension are implemented to describe the amplitude of waves. The effects of galloping are illustrated by numerical examples.