Results 21 to 30 of about 3,523,664 (305)
Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2016 Elastic-damping supports are widely spread in the design of aviation gas-turbine engines. These supports include elastic elements of the squirrel cage type.
S. A. Degtyarev +2 more
doaj +1 more source
Modal Testing of Rotors with Fluid Interaction
International Journal of Rotating Machinery, 1995 Modal testing of rotating structures has specific aspects, and it requires a specialized approach. Classical modal testing when applied to active (rotating) structures does not provide complete results.
Agnes Muszynska
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
Nonlinear dynamics of a dual-rotor-bearing system with active elastic support dry friction dampers
Nonlinear dynamicsIn present study, the modified harmonic balance-alternating frequency/time domain (HB-AFT) method with embedded arc-length continuation method is used to study the nonlinear dynamic characteristics of dual-rotor-bearing system with active elastic support
O. Xu, Shuqian Cao, Guanwu Li
semanticscholar +1 more source
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
doaj +1 more source
Differential Flatness of Quadrotor Dynamics Subject to Rotor Drag for Accurate Tracking of High-Speed Trajectories [PDF]
IEEE Robotics and Automation Letters, 2017 In this letter, we prove that the dynamical model of a quadrotor subject to linear rotor drag effects is differentially flat in its position and heading. We use this property to compute feedforward control terms directly from a reference trajectory to be
Matthias Faessler +2 more
semanticscholar +1 more source
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
doaj +1 more source
Helicopter Roll-Axis Instabilities induced by Pilot Cyclic Control: A Physical Explanation [PDF]
INCAS Bulletin, 2018 The main objective of this paper is to give a basic understanding of the mechanisms through which pilot cyclic inputs in lateral cyclic interacts with high-order rotor dynamics destabilizing the helicopter roll motion.
Marilena D. PAVEL, Achim IONITA
doaj +1 more source