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Aerodynamic damping of inclined slender prisms
Journal of Wind Engineering and Industrial Aerodynamics, 2018Abstract The aerodynamic damping of forward and backward inclined prisms has been identified through a series of forced vibration wind tunnel tests. The test results show that the amplitude of vibration and reduced wind velocity both have a significant effect on the aerodynamic damping of the inclined prisms, especially at reduced wind speeds where ...
Zeng-shun Chen +3 more
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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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Computation of Modal Aerodynamic Damping Using CFD
ASME 2003 Wind Energy Symposium, 2003This work focuses on the numerical evaluation of aerodynamic damping for a wind turbine rotor. A finite beam element code is used to describe the structure. Two types of aerodynamic models are compared. Firstly, two engineering semi-empirical dynamic stall models implemented in the structural code for modelling the aerodynamic forces are applied ...
Franck Bertagnolio +4 more
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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 of inclined slender prisms
2017This paper was reviewed and accepted by the APCWE-IX Programme Committee for Presentation at the 9th Asia-Pacific Conference on Wind Engineering, University of Auckland, Auckland, New Zealand, held from 3-7 December 2017.
Zeng-Shun Chen, K.T. Tse, K.C.S. Kwok
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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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Aerodynamic damping of sidewall bounded oscillating cantilevers
Journal of Fluids and Structures, 2014Abstract As a result of their simplicity, low power consumption, and relative ease of implementation, oscillating cantilevers have been investigated for use in multiple applications. However, the in situ operation in many cases, requires oscillating near one or more solid walls.
Andrew Eastman, Mark L. Kimber
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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.
Y. Watanabe, N. Isyumov, A.G. Davenport
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Aeroelastic Panel Optimization with Aerodynamic Damping
AIAA Journal, 1975AFOSR TN-58-469, June 1958, Dept. of Aeronautics, Johns Hopkins University, Baltimore, Md. 5 Morkovin, M. V., "Effects of Compressibility on Turbulent Flows," in The Mechanics of Turbulence, Gordon and Breach, New York, 1964, pp. 367-380. 6 Klebanoff, P. S., "Characteristics of Turbulence in a Boundary Layer with Zero Pressure Gradient," Kept.
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Maximum Mistuned Vibration Amplitude With Aerodynamic Damping
Volume 7B: Structures and Dynamics, 2016Mistuning can dramatically increase the forced response of a bladed disk. In the case of damping coming from aerodynamic effects the situation is more complicated because the value of the damping is typically different for the different travelling wave modes of the system. This damping variability changes the effect of mistuning, and it can even result
Carlos Martel, Luo Cuiping
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