Wind-induced response and excitation characteristics of an inclined cable model in the critical Reynolds number range

Jakobsen, Jasna Bogunović; Andersen, TL; Macdonald, John H G; Nikitas, Nikolaos; Larose, Guy L.; Savage, MG; McAuliffe, BR

doi:10.1016/j.jweia.2012.04.025

Cited by 47 publications

(27 citation statements)

References 10 publications

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“…1. More information about the testing was previously given in [8,9]. In short it should be noted that the model could oscillate in two perpendicular planes (denoted sway and heave; see Fig.…”

Section: Wind Tunnel Tests' Backgroundmentioning

confidence: 99%

“…A dedicated study that attempted to address similarities between the two phenomena [7] was confined to static models and the comparison was limited to the assessment of the static lift that can be produced in different dry configurations. As a matter of fact the exciting force during dry galloping motion, which could be central to a better understanding, has rarely been recorded and analysed [8,9]. This paper describes a series of large-scale wind tunnel tests which capture subtle forcing details of the dry galloping phenomenon.…”

Section: Introductionmentioning

confidence: 99%

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Aerodynamic forcing characteristics of dry cable galloping at critical Reynolds numbers

Nikitas

Macdonald

2015

European Journal of Mechanics - B/Fluids

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a b s t r a c tThis article attempts to highlight characteristics of the aerodynamic forcing on a rigid circular cylinder experiencing dry galloping vibrations. Observations from a series of wind tunnel tests are studied comparatively with the literature on rain-wind cable vibrations and on flow past inclined lifting bodies such as missiles, for drawing similarities. Unsteadiness and spatial variation of the flow, both previously undermined, are significant during the large cylinder motions recorded. Thus, they are here suspected to play a role in triggering unstable behaviour. Instabilities were restricted to specific ranges of cablewind angles and Reynolds numbers. The transitional features identified refute the view of simple bursting separation bubbles that rhythmically produce lift and suggest that there is a multitude of paths for energetically feeding dry galloping. Finally explanations are provided and a mechanism incorporating unstable features is proposed for future modelling.Crown

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Section: Wind Tunnel Tests' Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aerodynamic forcing characteristics of dry cable galloping at critical Reynolds numbers

Nikitas

Macdonald

2015

European Journal of Mechanics - B/Fluids

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“…The electronic pressure-scanning module converts them to high-level electronic signals. This system is a globally proven equipment for wind tunnel experiments in the construction, civil, and aerospace fields [22][23][24][25]. This electronic pressure-scanning module can accurately measure unsteady pressure signals within a small margin of error.…”

Section: Experimental Settingmentioning

confidence: 99%

Feasibility Study of Fluctuating Wind Pressure around High-Rise Buildings as a Potential Energy-Harvesting Source

Park¹,

Kim²,

Jung³

2019

Energies

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As the importance of sustainable energy increases, wind power generation systems utilizing wind energy around high-rise buildings are being developed. However, in existing wind turbine systems, it is necessary to solve noise, vibration problems, and structural issues for the installation of large-sized systems. In addition, small wind turbine systems can be installed only in limited areas such as roofs and corners, because their efficiency is limited to high and stable wind speed. For this reason, the distribution of fluctuating wind pressure around high-rise buildings was analyzed, and its feasibility as an energy source was evaluated, reflecting that fluctuating wind pressure can be used in vibration-based energy-harvesters. To achieve this, firstly, experimental conditions and theories were established to check the characteristic of wind pressure around high-rise buildings. The experiment was divided into the environment without surrounding buildings and the urban environment. Next, the pressure distribution around high-rise buildings and the quantitative results obtained from the experiment were determined. Finally, based on the results obtained from the experiments, the feasibility of fluctuating wind pressure as an energy-harvesting source was analyzed. From this study, it was found that fluctuating wind pressure can be used as a new energy source at new locations of high-rise buildings that were not utilized previously.Energies 2019, 12, 4032 2 of 31 with other systems. The Bahrain World Trade Center was the first building with large wind turbines. The two buildings support three 29-m-diameter horizontal-axis wind turbine (HAWT) systems. informed that the amount of energy using the integrated BIWT systems was almost 1100-1300 MWh per year [5]. This result was 11-15% of the total consumed energy of the building. The Bahrain World Trade Center is shown in Figure 1a. Pearl River Tower was designed to be a zero-energy building [6]. This building has two open spaces between three parts of the building. Eight 5-m-diameter Darrieus wind turbines are set up in the area of open space. Pearl River Tower is shown in Figure 1b. Strata Tower is a new 43-storey, 148-m-tall tower designed for sustainable regeneration [7]. This tower has three HAWT systems at the top of the building, and the diameter of their rotors is 9 m. Strata Tower is shown in Figure 1c. Although these systems have the advantage of producing large-scale electricity, they have drawbacks such as the need to consider noise, vibration problems, and structural factors due to their large size. In order to install large-scale BIWT systems in high-rise buildings, the structural issues have to be considered in the design process. Energies 2019, 12, x FOR PEER REVIEW 2 of 31 Figure 1. Large-scale building-integrated wind turbine (BIWT) systems: (a) Bahrain World Trade Center [5]; (b) Pearl River Tower [6]; (c) Strata Tower [7].

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“…The average value of the structural response reflects the action effect of mean wind (the equivalent static wind) to a certain degree, whereas the standard deviation indicates the fluctuating effect of wind. The standard deviation of the structural response under the fluctuating wind velocity with a certain assurance rate is usually taken as the design value of fluctuating response in practical engineering (Jakobsen [22]). Thus the distribution and variation laws of means and standard deviations of the structural responses are taken as the main indices in analysis.…”

Section: Analytical Modelmentioning

confidence: 99%

Wind-Induced Response Analysis of the Cylindrical Reticulated Mega-Structures

He¹,

Zhou²,

Hai-shun³

2016

Volume 12 Number 1

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ABSTRACT:With the further increase of span of spatial structures, wind load becomes one of the governing factors in structural design. Attention is paid to wind-induced response analysis of spatial grid structures in the recent years. Research on the wind-induced responses of the cylindrical reticulated mega-structure with double-layer plane-plate grid substructures is conducted by time-history method in this paper. The basic distribution laws of the wind-induced member internal forces and nodal displacements of both the main structure and substructures are first analyzed. By detailed parametric analyses, the effect of the geometric parameters, damping ratio, load, boundary condition, and wind velocity on structural wind-induced response is then studied. Finally the structural wind-induced vibration coefficients are analyzed, and their rational values are recommended. All this work will provide theoretical guidance to the wind-resistance design of this kind of structure.

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Wind-induced response and excitation characteristics of an inclined cable model in the critical Reynolds number range

Cited by 47 publications

References 10 publications

Aerodynamic forcing characteristics of dry cable galloping at critical Reynolds numbers

Aerodynamic forcing characteristics of dry cable galloping at critical Reynolds numbers

Feasibility Study of Fluctuating Wind Pressure around High-Rise Buildings as a Potential Energy-Harvesting Source

Wind-Induced Response Analysis of the Cylindrical Reticulated Mega-Structures

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