Results 21 to 30 of about 2,542,287 (293)
Model Analysis of Axial PM Bearingless Flywheel Machine
IEEE Access, 2022 The special rotor structure of the axial permanent magnet (PM) bearingless flywheel machine (APM-BFM) makes its critical speed more easily affected at high speed, but there are few studies on its rotor dynamics, especially under load conditions.
Zhiying Zhu +4 more
doaj +1 more source
Critical Vibration and Control of the Maglev High-Speed Motor Based on μ–Synthesis Control
Sensors, 2022 The Maglev motor has the characteristics of high-speed and high-power density, and is widely used in compressors, molecular pumps and other high-speed rotating machinery.
Yefa Hu +4 more
doaj +1 more source
NUMERICAL PREDICTION OF SOLITARY WAVE FORMATION OF A PLANING HULL IN SHALLOW WATER CHANNELS
Brodogradnja, 2020 This paper uses a CFD (Computational Fluid Dynamics) analysis to investigate the shallow water effects on prismatic planing hull. The turbulence flow around the hull was described by Reynolds Navier Stokes equations RANSE using the k-ɛ turbulence model ...
Tamer M. Ahmed +4 more
doaj +1 more source
On the Third Critical Speed for Rotating Bose-Einstein Condensates [PDF]
, 2016 We study a two-dimensional rotating Bose-Einstein condensate confined by an anharmonic trap in the framework of the Gross-Pitaevksii theory. We consider a rapid rotation regime close to the transition to a giant vortex state.
Abramovitz M. +4 more
core +2 more sources
Mechanical Engineering Journal, 2019 These days, centrifugal compressors and other industrial turbomachines tend to be faster, downsized, and reduced in cost. If a technology can be established for operation of machines over higher critical speed using an active magnetic bearing, the number
Hiroyuki FUJIWARA +3 more
doaj +1 more source
Critical Speed Control for a Fixed Blade Variable Speed Wind Turbine
Energies, 2017 A critical speed controller for avoiding a certain rotational speed is presented. The controller is useful for variable speed wind turbines with a natural frequency in the operating range.
Morgan Rossander +2 more
doaj +1 more source
Critical speed and limit cycles in the empty Y25-freight wagon [PDF]
, 2006 Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence
Hecht, Markus +2 more
core +1 more source
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C, 1995 Internal resonance of cracked rotors is investigated using 2-degree-of-freedom rotor systems. Phenomena at the major critical speed and other subcritical speeds in the precritical speed range are discussed theoretically and experimentally. Phenomena in a lateral oscillation model with internal resonance and in an inclination oscillation model with no ...
Yukio ISHIDA, Kazuharu HIROKAWA
openaire +2 more sources
Critical wind speed at which trees break [PDF]
Physical Review E, 2016 Data from storms suggest that the critical wind speed at which trees break is constant (≃42m/s), regardless of tree characteristics. We question the physical origin of this observation both experimentally and theoretically. By combining Hooke's law, Griffith's criterion, and tree allometry, we show that the critical wind speed indeed hardly depends on ...
Virot, E. +4 more
openaire +3 more sources
Applied Sciences, 2021 To satisfy the requirements of high speed, large capacity and constant winding, a textile winding rotor needs to work in a wide rotation speed range and frequently pass through critical speed points. Thus, the winding rotor adopts the flexible long shaft
Xunxun Ma +5 more
doaj +1 more source