Results 251 to 260 of about 4,272 (296)
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Journal of Wind Engineering and Industrial Aerodynamics, 1996
Abstract This paper describes the aerodynamic damping of two-dimensional (2-D) rectangular prisms in smooth flow, which characterizes the aerodynamic instability, mainly torsional flutter or coupled flutter. Their generation mechanisms, in particular, are discussed on the basis of aerodynamic derivatives, obtained from the unsteady pressure ...
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Abstract This paper describes the aerodynamic damping of two-dimensional (2-D) rectangular prisms in smooth flow, which characterizes the aerodynamic instability, mainly torsional flutter or coupled flutter. Their generation mechanisms, in particular, are discussed on the basis of aerodynamic derivatives, obtained from the unsteady pressure ...
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Aerodynamic damping in lateral buffeting.
, 2009 Using the balanced cantilever method of erection, the cable-stayed bridge during its critical construction phase resembles a long overhanging cantilever structure. This type of structure is particularly vulnerable to wind-induced buffeting instabilities because of its low natural frequencies and low overall stiffness.
Dwivedi, Tashi.
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Empirical aerodynamic damping function for tall buildings
Journal of Wind Engineering and Industrial Aerodynamics, 1997This paper describes an empirical aerodynamic damping function for tall buildings and prisms. Empirical aerodynamic impedance functions (damping and stiffness) have been proposed. Their applicability has been examined using experimentally obtained aerodynamic damping values for prisms.
N Isyumov, A G Davenport
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Experimental evaluation of aerodynamic damping of tall buildings
Journal of Wind Engineering and Industrial Aerodynamics, 1996Aerodynamic damping of tall buildings is evaluated by wind tunnel tests using a stick model. The model is a 1500 scale model of a building. The side ratio of the model is varied in the range 0.33–3, and the aspect ratio is varied from 4 to 6. The aerodynamic damping ratios are evaluated from the wind-induced responses of the model by using the random ...
H Marukawa
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Experimental study of aerodynamic damping of a twisted supertall building
Journal of Wind Engineering and Industrial Aerodynamics, 2018 The aerodynamic damping ratios and aeroelastic instability of a 180 degrees helical supertall building with good aerodynamic behavior in both the along-wind and across-wind responses were investigated using an aeroelastic model test (rocking vibration ...
Wonsul Kim +2 more
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Identification of aerodynamic damping matrix for operating wind turbines [PDF]
Mechanical Systems and Signal Processing, 2021 © 2020 Elsevier Ltd Accurate knowledge of wind turbine tower vibration damping is essential for the estimation of fatigue life. However, the responses in the fore-aft and side-side directions are coupled through the wind-rotor interaction under ...
Chao Chen +2 more
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Dynamic Stall and Aerodynamic Damping
Journal of Solar Energy Engineering, 1998Riso̸ has developed a dynamic stall model that is used to analyze and reproduce open air blade section measurements as well as wind tunnel measurements. The dynamic stall model takes variations in both angle of attack and flow velocity into account. The paper gives a brief description of the dynamic stall model and presents results from analyses of ...
Flemming Rasmussen +2 more
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Effects of aerodynamic damping on the tower load of offshore horizontal axis wind turbines
Applied Energy, 2017 Aerodynamic damping has an important effect on the dynamic response of offshore Horizontal Axis Wind Turbines (HAWTs). In this paper, an analysis of the loads on offshore HAWTs is presented.
Cheng Lu, Gangqiang Li, Ajit Godbole
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2021
The effects of damping and/or aerodynamic drag are addressed. We begin with linear damping. Much of the material deals with damped oscillators (mass–spring–dashpot systems), for which three cases are considered: (i) zero forcing, (ii) periodic forcing and (iii) arbitrary forcing. Illustrative examples include a simple test to find out when it's time to
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The effects of damping and/or aerodynamic drag are addressed. We begin with linear damping. Much of the material deals with damped oscillators (mass–spring–dashpot systems), for which three cases are considered: (i) zero forcing, (ii) periodic forcing and (iii) arbitrary forcing. Illustrative examples include a simple test to find out when it's time to
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Aerodynamic damping of vibrations in rotor blades
The Journal of the Acoustical Society of America, 1986In order to combat flutter in rotor blades rotating within a duct bounded by a duct wall, the duct wall incorporates cavities tuned for resonance to a known flutter frequency. The cavities, which may comprise tubes immediately underlying a facing sheet of the duct wall, are arrayed around the circumference of the duct wall and communicate with the duct
Brian Barry, Christopher Freeman
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