Aerodynamic damping of an inclined circular cylinder in unsteady flow and its application to the prediction of dry inclined cable galloping

Raeesi, Arash; Cheng, Shaohong; Ting, David S.‐K.

doi:10.1016/j.jweia.2012.12.003

Cited by 19 publications

(5 citation statements)

References 11 publications

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“…A large vibration of an inclined cable so-called dry galloping, which attracts much interest, has been addressed through a lot of experimental and theoretical studies because of its complicated aerodynamics (Cheng et al, 2008;Jakobsen et al, 2012;Larose, 2006, 2008a, b;Matsumoto et al, 2010;Nikitas and Macdonald, 2015;Raeesi et al, 2013). Thesevibrations occur for dry inclined cables without ice accretion and differ from both conventional across-wind galloping and wind-rain-induced vibrations.…”

Section: Introductionmentioning

confidence: 99%

Galloping of an elliptical cylinder at the critical Reynolds number and its quasi-steady prediction

Macdonald

Liu

et al. 2017

Journal of Wind Engineering and Industrial Aerodynamics

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Dry galloping of inclined cables has been shown to have a strong relation to the critical Reynolds number. This study concerns the occurrence of galloping of an elliptical cylinder at critical Reynolds numbers under normal wind and an assessment of the quasi-steady assumption on predicting these vibrations. A series of static and dynamic wind tunnel tests are carried out to measure the wind pressure on a static cylinder and displacement of a three-degree-freedom vibrating cylinder. The static aerodynamic force on the cylinder shows the occurrence of reattachment which lowers the drag coefficient and increases the lift coefficient at critical Reynolds numbers. This phenomenon gives the possibility of satisfying the across-wind galloping criterion by adversely changing the aerodynamic force with the angle of attack. Meanwhile, unsteady and steady amplitude galloping are observed in dynamic tests in a certain range of Reynolds number and angle of attack. The observations indicate that the galloping is across-wind dominated and strongly depends on the Reynolds number. Finally, quasi-steady predictions of galloping instability are compared with the observed galloping. Most of the observed occurrences of galloping are in the predicted unstable range, but several other cases for which galloping was predicted do not exhibit large vibrations. This implies that the quasi-steady assumption does not work well in predicting the galloping of elliptical cylinders at critical Reynolds numbers.

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Section: Introductionmentioning

confidence: 99%

Galloping of an elliptical cylinder at the critical Reynolds number and its quasi-steady prediction

Macdonald

Liu

et al. 2017

Journal of Wind Engineering and Industrial Aerodynamics

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“…Numerical models for motion analysis of sub-conductors rely on the quasi-steady theory (QST) [33][34][35][36]. In order to study the galloping feature of iced conductors, the aerodynamic characteristics should be obtained.…”

Section: Analysis Of Galloping Characteristics Of Multi-span Iced Con...mentioning

confidence: 99%

Numerical Simulation of Galloping Characteristics of Multi-Span Iced Eight-Bundle Conductors Tower Line System

Bowen

Cai

Zhou³

et al. 2022

Buildings

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The galloping condition of an iced eight-bundle conductor tower line system, under different parameters, is studied by using a finite element model of a multi-span iced eight-bundle conductor tower line system. The galloping frequency, amplitude, traces of multi-span iced eight-bundle conductors under different wind velocities, span lengths, and initial angles of wind attack are discussed. The different tower line connection methods are compared, based on existing research on the relationship between the aerodynamic characteristics of the conductor and galloping conditions. The results show that the galloping situation of a multi-span iced eight-bundle conductor tower line system varies greatly depending on the conditions, which has a significant impact on the tower line.

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“…The aerodynamic damping ratios, axn  and ayn  , of the nth mode of the tower respectively in x and y axes are given by the derivatives of the generalized wind forces to the generalized vibration speeds (see e.g., Raeesi, et al, 2013): The following derivatives are consequently obtained:…”

Section: Steps Of the Analysismentioning

confidence: 99%

“…Momomura et al, 1997), test results revealed that conductors have significant influences on wind-induced vibration of towers. Moreover, aerodynamic damping ,which explains fluid-solid coupling between wind and structures, was much more investigated and theoretical models were proposed (Holmes, 1996a;Kareem and Gurley, 1996;Macdonald and Larose, 2006;Takeuchi et al, 2010;Raeesi et al, 2013).…”

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confidence: 99%

Experimental and numerical study on the responses of a transmission tower to skew incident winds

Deng

Duan

et al. 2016

Journal of Wind Engineering and Industrial Aerodynamics

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A study on a lattice suspension tower in a four-span transmission line system subjected to skew incident wind forces is presented via experimental and numerical approaches. The purpose of this work is to investigate the response features of the tower especially to the wind not incoming along the structure's principle axes. At the geometric scaling of 1: 80, the aeroelastic model is manufactured with scaled rigidity, mass, area projection and frequency. Wind tunnel tests on the model, with and without conductors, are conducted at a variety of incident angles. Then numerical simulations are applied quasi-steadily to figure out an analytical way of interpreting and supplementing experimental results. Such quasi-steady method is generally valid since the tested aerodynamic damping ratios, though scattered, roughly meet the quasi-steady formulae.

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Aerodynamic damping of an inclined circular cylinder in unsteady flow and its application to the prediction of dry inclined cable galloping

Cited by 19 publications

References 11 publications

Galloping of an elliptical cylinder at the critical Reynolds number and its quasi-steady prediction

Galloping of an elliptical cylinder at the critical Reynolds number and its quasi-steady prediction

Numerical Simulation of Galloping Characteristics of Multi-Span Iced Eight-Bundle Conductors Tower Line System

Experimental and numerical study on the responses of a transmission tower to skew incident winds

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