Results 21 to 30 of about 40,364 (312)
International Journal of Rotating Machinery, 1999 The transient process which starts at the instability threshold of a rotor rotating in a fluid environment, and ends up in the limit cycle of self-excited vibrations known as fluid whirl or fluid whip, is discussed in this paper.
Agnes Muszynska
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The flow field around a rotor in axial descent [PDF]
, 2005 Measurements of the flow field around a model rotor descending axially into its own vortex wake have been performed using particle image velocimetry (PIV). At low descent rates, the expected cylindrical down-flow structure below the rotor is observed. At
Brown, R.E., Gillies, E.A., Green, R.B.
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International Journal of Rotating Machinery, 1996 The paper presents the dynamic analysis of an anisotropic rotor system with fluid interaction by using modal nonsynchronous perturbation testing and dynamic stiffness approaches.
Eungu Jang +3 more
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Wake dynamics and rotor-fuselage aerodynamic interactions
, 2009 The unsteady loads experienced by a helicopter are known to be strongly influenced by aerodynamic interactions between the rotor and fuselage; these unsteady loads can lead to deficiencies in handling qualities and unacceptable vibratory characteristics ...
Brown, R.E., Kenyon, A.R.
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Main rotor-tail rotor intraction and its implications for helicopter directional control
, 2008 Aerodynamic interference between the main and tail rotor can have a strong negative influence on the flight mechanics of a conventional helicopter. Significant unsteadiness in the tail rotor loading is encountered under certain flight conditions, but the
Fletcher, Timothy M. +2 more
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Lubricants, 2022 Gas bearings have been widely applied to high-speed rotating machines due to their low friction and high rotational speed advantages. Nevertheless, gas lubrication is low viscosity and compressible.
Jianbo Zhang +9 more
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A Nonlinear Model for Prediction of Dynamic Coefficients in a Hydrodynamic Journal Bearing
International Journal of Rotating Machinery, 2004 This paper investigates the variation of nonlinear stiffness and damping coefficients in a journal orbit with respect to equilibrium position. The journal orbit is obtained by the combined solution of equations of motion and Reynolds equation.
Jerzy T. Sawicki, T. V. V. L. N. Rao
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Experimental study of the aircraft air cycle machine rotor dynamics on gas foil bearings [PDF]
MATEC Web of Conferences, 2020 In this paper the results of the experimental research of the dynamics of the rotor of a four-wheeled aircraft air cycle machine on gas foil supports under conditions of vibration.
Tishhenko Igor Valerevich +2 more
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Helicopter tail rotor orthogonal blade vortex interaction [PDF]
, 2004 The aerodynamic operating environment of the helicopter is particularly complex and, to some extent, dominated by the vortices trailed from the main and tail rotors. These vortices not only determine the form of the induced flow field but also interact
Marshall, J.S. +7 more
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Impact of Heat Treatment on the Rubbing Behavior of Bump-Type Foil Journal Bearing
Tribology OnlineUnder low-speed or start/stop conditions, the rubbing of top foil in foil journal bearing (FJB) prompting the application of heat treatment to improve the rubbing behavior of the foil bearing.
Vishal Mourya, Skylab P. Bhore
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