Vibration Characteristics of a Rotor System in Contact with a Backup Bearing: Cases with Various Failure Patterns of the Active Magnetic Bearing

Ishida, Yukio; Inoue, Tsuyoshi

doi:10.1177/1077546307081324

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…Besides, protection systems (auxiliary bearings) must be included in the system for safety reasons in case of electric failure [1][2][3], Magnetic bearings have the advantage of working without contact to the shaft in a wide range of frequencies, and they are considered "clean" devices because there is no need for any kind of lubrication between the shaft and the bearing, except air.…”

Section: Introductionmentioning

confidence: 99%

Lateral Vibration Attenuation of Shafts Supported by Tilting-Pad Journal Bearing With Embedded Electromagnetic Actuators

Viveros¹,

Nicoletti

2013

Journal of Engineering for Gas Turbines and Power

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Hydrodynamic tilting-pad bearings with electromagnetic actuators are designed to take advantage of the load-carrying capacity of the hydrodynamic bearing together with the actuation capacity of the electromagnets. Hence, actuators can be downsized because they do not work as bearings as it is the case of magnetic bearings. In this work, one presents the numerical and experimental analysis of rotor vibration attenuation using a tilting-pad journal bearing with embedded electromagnetic actuators when proportionalderivative (PD) control is implemented. Experimental results in the frequency domain show reductions in shaft-vibration amplitude of 11% for the rotating speed of 600 rpm and 18% for the rotating speed of 1100 rpm, with good agreement of the mathematical model. The actuation capacity of the bearing in study is compared to the capacity of other active bearings in literature, showing that the present bearing is competitive in terms of specific control capacity.

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Section: Introductionmentioning

confidence: 99%

Lateral Vibration Attenuation of Shafts Supported by Tilting-Pad Journal Bearing With Embedded Electromagnetic Actuators

Viveros¹,

Nicoletti

2013

Journal of Engineering for Gas Turbines and Power

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“…The influence of cross-coupling effects on the dynamics of the systems was investigated (Shang et al, 2010). Besides, there are some special cases in which rub-impact occurs normal (Dai et al, 2001;Sun, 2006;Ishida and Inoue, 2008;Keogh, 2012;Markert, 1998), such as the drive shaft/dry friction damper system in this paper. The studies on dry friction dampers applied to helicopter tail shaft damping are very limited.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear vibration response of a helicopter supercritical tail rotor drive shaft equipped with a dry friction damper

Song

Chen

et al. 2022

JIMSE

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PurposeThe supercritical design of tail rotor drive shaft has attracted more attention in helicopter design due to its high power–weight ratio and low maintenance cost. However, there exists excessive vibration when the shaft passes through the critical frequency. Dry friction damper is the equipment applied to the drive shaft to suppress the excessive vibration. In order to figure out the damping mechanism of the dry friction damper and improve the damping efficiency, the dynamic model of the shaft/damper system is established based on the Jeffcott rotor model.Design/methodology/approachThe typical frequency response of the system is studied through bifurcation diagrams, amplitude-frequency characteristic curves and waterfall frequency response spectrum. The typical transient responses under frequency sweeps are also obtained.FindingsThe results show that the response of the system changes from periodic no-rub motion to quasi-periodic rub-impact motion, and then to synchronous full annular rub-impact, and finally, back to periodic no-rub motion. The slip of the rub-impact ring improves the stability of the system. Besides, the effects of the system parameters including critical dry friction force, rub-impact friction coefficient, initial clearance on the stability and the vibration damping capacity are studied. It is observed that the stability changes significantly varying the three parameters respectively. The vibration damping capacity is mainly affected by the critical dry friction force and the initial clearance.Originality/valuePresented results provide guidance for the design of the dry friction damper.

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“…It is shown that passing through the first bending mode during a rotor drop followed by a coast-down may be an issue even if Siegl et al [21] showed that no dangerous behaviours were triggered. The nonlinear dynamic regimes associated with rotor coast-down were analysed in references [22,23]. Jumps, periodic, quasi-periodic and chaotic motions may be 35 found.…”

Section: Introductionmentioning

confidence: 99%

Touchdown bearing models for rotor-AMB systems

Jarroux

Dufour

Mahfoud

et al. 2019

Journal of Sound and Vibration

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This paper investigates numerically and experimentally the rotor drop dynamics when unexpected Active Magnetic Bearings (AMBs) shut down occurs.In such an event, the rotor behaviour drops on two touchdown bearings (TDBs) composed of a ball bearing and a ribbon damper providing stiffness and damping to the overall system. The aim of this paper is to establish and to validate the rotor-drop system model. A first experimental set up is used to identify the dynamic characteristics of the corrugated ribbon damper and to test the Kelvin-Voigt model and the generalized Dahl model. Then, three TDB models are proposed including either the first or the second ribbon damper models. The second experimental set-up is devoted to the rotor drop response of an industrial scale rotor-AMB system equipped with two TDBs. Rotor drop simulations in the time domain are carried out by using the Finite Element method and the three TDB models. Predicted and measured rotor drop responses are compared regarding the displacements as well as transmitted loads and permits evaluating the model efficiency.

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Vibration Characteristics of a Rotor System in Contact with a Backup Bearing: Cases with Various Failure Patterns of the Active Magnetic Bearing

Cited by 7 publications

References 6 publications

Lateral Vibration Attenuation of Shafts Supported by Tilting-Pad Journal Bearing With Embedded Electromagnetic Actuators

Lateral Vibration Attenuation of Shafts Supported by Tilting-Pad Journal Bearing With Embedded Electromagnetic Actuators

Nonlinear vibration response of a helicopter supercritical tail rotor drive shaft equipped with a dry friction damper

Touchdown bearing models for rotor-AMB systems

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