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Relevant bibliographies by topics / Rotori principali

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Journal articles

Academic literature on the topic 'Rotori principali'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Rotori principali"

1

Zhang, Xiao Long, Ya Bin Dong, Yu Min He, and Mei Juan Tong. "Forced Vibration of Rotor Suppressed by a Automatic Ball Balancer (Nonlinear Principal Resonances)." Advanced Materials Research 655-657 (January 2013): 551–57. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.551.

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The automatic ball balancer is equipment used to balance the rotor system online and control its forced vibration. Although the rotor system is a nonlinear system actually, especially the occurrence of the nonlinear elastic restoring force in the support of rolling elements bearings, many researches still focus on the linear rotor systems at present. The Jeffcott rotor acted by unsymmetrical nonlinear restoring force is studied in this paper. Through the resolving theoretically and simulating numerically, the principal resonance respond of the rotor system controlled by the balancer with two b

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2

Chiang, H. W. D., and S. Fleeter. "Passive Control of Flow-Induced Vibrations by Splitter Blades." Journal of Turbomachinery 116, no. 3 (1994): 489–500. http://dx.doi.org/10.1115/1.2929438.

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Splitter blades as a passive control technique for flow-induced vibrations are investigated by developing an unsteady aerodynamic model to predict the effect of incorporating splitter blades into the design of an axial flow blade row operating in an incompressible flow field. The splitter blades, positioned circumferentially in the flow passage between two principal blades, introduce aerodynamic and/or combined aerodynamic-structural detuning into the rotor. The unsteady aerodynamic gust response and resulting oscillating cascade unsteady aerodynamics, including steady loading effects, are det

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3

Lanchares, V., M. Iñarrea, and J. P. Salas. "Spin Rotor Stabilization of a Dual-Spin Spacecraft with Time Dependent Moments of Inertia." International Journal of Bifurcation and Chaos 08, no. 03 (1998): 609–17. http://dx.doi.org/10.1142/s0218127498000401.

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We consider a dual-spin deformable spacecraft, in the sense that one of the moments of inertia is a periodic function of time such that the center of mass is not altered. In the absence of external torques and spin rotors, by means of the Melnikov's method we prove that the body motion is chaotic. Stabilization is obtained by means of a spinning rotor about one of the principal axes of inertia.

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4

Viswanathan, R., and S. M. Bruemmer. "In-Service Degradation of Toughness of Steam Turbine Rotors." Journal of Engineering Materials and Technology 107, no. 4 (1985): 316–24. http://dx.doi.org/10.1115/1.3225825.

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The toughness of steam turbine rotors degrades with time of service exposure in the range of 340°–540°C. There is a need to estimate the toughness degradation that has occurred in order to assess the reliability, remaining life, and further operational parameters for the rotors. Since it is not possible to take large specimens from operating rotors to evaluate the rotor toughness, nondestructive or relatively nondestructive techniques involving removal of small samples are needed. To serve this need, several techniques such as composition based correlations, grain boundary analysis by Auger el

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5

Bejaoui, Islem, Dario Bruneo, and Maria Gabriella Xibilia. "Remaining Useful Life Prediction of Broken Rotor Bar Based on Data-Driven and Degradation Model." Applied Sciences 11, no. 16 (2021): 7175. http://dx.doi.org/10.3390/app11167175.

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Rotating machines such as induction motors are crucial parts of most industrial systems. The prognostic health management of induction motor rotors plays an essential role in increasing electrical machine reliability and safety, especially in critical industrial sectors. This paper presents a new approach for rotating machine fault prognosis under broken rotor bar failure, which involves the modeling of the failure mechanism, the health indicator construction, and the remaining useful life prediction. This approach combines signal processing techniques, inherent metrics, and principal componen

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6

Parish, D., and D. G. MacManus. "Aerodynamic investigations of ventilated brake discs." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 219, no. 4 (2005): 471–86. http://dx.doi.org/10.1243/095440705x11121.

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The heat dissipation and performance of a ventilated brake disc strongly depends on the aerodynamic characteristics of the flow through the rotor passages. The aim of this investigation was to provide an improved understanding of ventilated brake rotor flow phenomena, with a view to improving heat dissipation, as well as providing a measurement data set for validation of computational fluid dynamics methods. The flow fields at the exit of four different brake rotor geometries, rotated in free air, were measured using a five-hole pressure probe and a hot-wire anemometry system. The principal me

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7

Hansen, Morten Hartvig. "Modal dynamics of structures with bladed isotropic rotors and its complexity for two-bladed rotors." Wind Energy Science 1, no. 2 (2016): 271–96. http://dx.doi.org/10.5194/wes-1-271-2016.

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Abstract. The modal dynamics of structures with bladed isotropic rotors is analyzed using Hill's method. First, analytical derivation of the periodic system matrix shows that isotropic rotors with more than two blades can be represented by an exact Fourier series with 3/rev (three per rotor revolution) as the highest order. For two-bladed rotors, the inverse mass matrix has an infinite Fourier series with harmonic components of decreasing norm; thus, the system matrix can be approximated by a truncated Fourier series of predictable accuracy. Second, a novel method for automatically identifying

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8

Ur Rahman, Lutf, Faisal Khan, Muhammad Afzal Khan, et al. "Modular Rotor Single Phase Field Excited Flux Switching Machine with Non-Overlapped Windings." Energies 12, no. 8 (2019): 1576. http://dx.doi.org/10.3390/en12081576.

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This paper aims to propose and compare three new structures of single-phase field excited flux switching machine for pedestal fan application. Conventional six-slot/three-pole salient rotor design has better performance in terms of torque, whilst also having a higher back-EMF and unbalanced electromagnetic forces. Due to the alignment position of the rotor pole with stator teeth, the salient rotor design could not generate torque (called dead zone torque). A new structure having sub-part rotor design has the capability to eliminate dead zone torque. Both the conventional eight-slot/four-pole s

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9

Zapoměl, Jaroslav, Jan Kozánek, and Petr Ferfecki. "Investigations of Transient Oscillations of Rotors Supported by Magnetorheological Squeeze Film Dampers Using Bilinear Material to Model the Lubricant." Applied Mechanics and Materials 821 (January 2016): 309–16. http://dx.doi.org/10.4028/www.scientific.net/amm.821.309.

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Unbalance of rotors is one of the principal causes of their lateral vibration. A technological solution frequently used to its suppression consists in placing damping devices to the rotor supports. To achieve their optimum performance their damping effect must be controllable. This is offered by squeeze film dampers utilizing the magnetorheological phenomenon to control the damping force. In mathematical models magnetorheological oils are usually represented by Bingham or Herschel-Bulkley theoretical materials. Here the magnetorheological oil is modeled by bilinear material with the yielding s

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10

Beaumier, P., M. Costes, and D. Petot. "Couplage dynamique - aérodynamique sur le rotor principal d'hélicoptère." La Houille Blanche, no. 3-4 (June 2000): 38–46. http://dx.doi.org/10.1051/lhb/2000026.

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