Aseismic Vibration Control of Flexible Rotors Using Active Magnetic Bearing

Matsushita, Osami; Imashima, Toshio; Hisanaga, Yoshitaka; Okubo, Hiroki

doi:10.1115/1.1423633

Cited by 20 publications

(8 citation statements)

References 3 publications

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“…Stiffness, damping, as well as load capacity, can be varied widely within physical limits, and can be adjusted to technical requirements. The dynamics of the contact-free hovering depends mainly on the implemented control law [38][39][40][41][42][43]. The suitable work scope of AMBs is shown in Fig.…”

Section: Operation Range Of Gfbs and Ambsmentioning

confidence: 99%

Theoretical investigation of hybrid foil-magnetic bearings on operation mode and load sharing strategy

Zhang

Yin

Guan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper presents a theoretical investigation on operation mode and load sharing strategy of hybrid foil-magnetic bearings (HFMBs). According to the inherent characteristics of gas foil bearings (GFBs) and active magnetic bearings (AMBs), six possible work scopes are discussed to understand the operation mode of HFMBs. A numerical model coupling the calculations of the film pressure in GFBs and the magnetic forces in AMBs is conducted to predict the operation performance of HFMBs. The accuracy of the model is proved by comparing the predicted and tested friction torques. Analysis on the static and dynamic performance of HFMBs within three representative cases is conducted by varying the load sharing ratio. The dynamic supporting stiffness and operation position of HFMBs can be obviously enhanced by adjusting the operating mode and load sharing strategy. Results show that the direct stiffness and dynamic damping of HFMBs adopting hybrid mode are significantly higher than those adopting AMB or GFB independent mode.

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Section: Operation Range Of Gfbs and Ambsmentioning

confidence: 99%

Theoretical investigation of hybrid foil-magnetic bearings on operation mode and load sharing strategy

Zhang

Yin

Guan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Matsushita et al. 24 proposed aseismic vibration control of flexible rotors with active magnetic bearings to suppress rotor vibration generated by the earthquakes. In these investigations, EMBs are used for vibration control of rotor-bearing systems with rigid or elastic bases.…”

Section: Introductionmentioning

confidence: 99%

“…Roy et al 23 studied the influence of the viscoelastic control law on the dynamic behavior of a rigid rotor-shaft system with active magnetic bearings. Matsushita et al 24 proposed aseismic vibration control of flexible rotors with active magnetic bearings to suppress rotor vibration generated by the earthquakes. In these investigations, EMBs are used for vibration control of rotor-bearing systems with rigid or elastic bases.…”

Section: Introductionmentioning

confidence: 99%

Lateral vibration control of a shafting-hull coupled system with electromagnetic bearings

Qin

Zheng

Qin

et al. 2018

Journal of Low Frequency Noise, Vibration and Active Control

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In order to suppress lateral vibration transmission and reduce acoustic radiation of a shafting-hull coupled system, a new approach using electromagnetic bearings in the shafting system is proposed. The dynamic characteristics of the electromagnetic bearings, especially the equivalent stiffness and damping as well as the applicable scope of linearization of the electromagnetic bearings, are analysed at first. With the equivalent parameters, a dynamic model of the shaftinghull coupled system is established subsequently by using the frequency response synthesis method to derive frequency response functions associated with the lateral vibrations. Finally, the influence of the control parameters of the electromagnetic bearings on vibration transmission in the shafting-hull system is studied. Analysis results indicate that lateral vibration responses are suppressed significantly when electromagnetic bearings are introduced into the shafting-hull system, and as a result, sound radiation of the system is reduced, which demonstrates that the proposed approach is effective in controlling vibration transmission in the shafting system.

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“…The electronic controllers can change bearing stiffness and damping properties, allowing for adjustments to system dynamics that affect resonance frequencies and reduce transmitted vibration. Magnetic bearings integrated into a rotorbearing system may be used for synchronous disturbance control and vibration control [Knospe, Hope, Fedigan and Williams, 1995;Matsushita, Imashima and Okubo, 2002;Cole, Keogh and Burrows, 2002;Kasarda, Mendoza, Kirk and Wicks, 2004;Shi, Zmood and Qin, 2004]; vibration suppression and attenuation [Knospe and Tamer, 1997;Cole, Keogh and Burrows, 1998;Keogh, Cole and Burrows, 2002;Johnson, Nascimento, Kasarda and Fuller, 2003]; for active health monitoring of rotordynamic systems [Mani, Quinn and Kasarda, 2006]; and on-line identification and fault diagnosis [Aenis, Knopf and Nordmann, 2002;Quinn, Mani, Kasarda, Bash, Inman and Kirk, 2005].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamics of Magnetic Bearing Systems

Hansen

Zander

2008

Journal of Intelligent Material Systems and Structures

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Magnetic bearings use magnetic forces to support various machine components. Because of the non-contact nature of this type of suspension, magnetic bearing technology offers a number of significant advantages over conventional bearings, such as rolling element and fluid film bearings. An active magnetic bearing basically consists of an electromagnetic actuator, position sensors, power amplifiers, and a feedback controller. All of these components are characterized by nonlinear behavior and therefore the entire system is inherently nonlinear. However, in simulations of the dynamic behavior of magnetic bearing systems, the nonlinearities are usually neglected to simplify the analysis and only linear models are used. Moreover, many control techniques currently used in magnetic bearing systems are generally designed by ignoring nonlinear effects. The main reason for simplification is the intractability of the complexity of the actual model. In fact, the inherent nonlinear properties of magnetic bearing systems can lead to dynamic behavior of a magnetically suspended rotor that is distinctly different from that predicted using a simple linearized model. Therefore, the nonlinearities should be taken into account. This literature review is focused on the nonlinear dynamics of magnetic bearing systems and it provides background information on analytical methods, nonlinear vibrations resulting from a rotor contacting auxiliary bearings, and other active topics of research involving the nonlinear properties of magnetic bearing systems, such as nonlinear self-sensing magnetic bearings and nonlinear control of magnetic bearings. The review concludes with a brief discussion on current and possible future directions for research on the nonlinear dynamics of magnetic bearing systems.

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Aseismic Vibration Control of Flexible Rotors Using Active Magnetic Bearing

Cited by 20 publications

References 3 publications

Theoretical investigation of hybrid foil-magnetic bearings on operation mode and load sharing strategy

Theoretical investigation of hybrid foil-magnetic bearings on operation mode and load sharing strategy

Lateral vibration control of a shafting-hull coupled system with electromagnetic bearings

Nonlinear Dynamics of Magnetic Bearing Systems

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