Dynamic Behavior of the AMB’s Vertical Arranged Rotor During Its Drop Process

Kang, Xiao; Yang, Guang-Hong; Yu, Suyuan

doi:10.1115/icone22-30062

Cited by 6 publications

(4 citation statements)

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“…Rolling and sliding friction are also included in the simulation. Thus the model is more accurate than that presented in the previous study [17]. This new model adds new features and precision.…”

Section: Introductionmentioning

confidence: 58%

“…The rotor drop can be explained as a combination of the following three processes [17]: free drop under gravity; backward whirling tendency; and forward whirling motion, driven by unbalance. These equations can explain the reason of the forward whirl dominance due to unbalance.…”

Section: Axial Interaction Between the Rotor And The Auxiliary Bearingsmentioning

confidence: 99%

“…Results have shown that severe internal plastic deformation and damage to the auxiliary bearing performance are avoided. A dynamic model with consideration of axial and radial friction forces is established by Kang [17]. The influences of rotational frequency, stiffness and damping on the rotor dynamic behavior are evaluated accordingly.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Analysis for the Rotor Drop Process and Its Application to a Vertically Levitated Rotor/Active Magnetic Bearing System

Zhao

Yang

Keogh

et al. 2017

Journal of Tribology

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Active magnetic bearings (AMBs) have been utilized widely to support high-speed rotors. However, in the case of AMB failure, emergencies, or overload conditions, the auxiliary bearing is chosen as the backup protector to provide mechanical supports and displacement constraints for the rotor. With lack of support, the auxiliary bearing will catch the dropping rotor. Accordingly, high contact forces and corresponding thermal generation due to mechanical rub are applied on the dynamic contact area. Rapid deterioration may be brought about by excessive dynamic and thermal shocks. Therefore, the auxiliary bearing must be sufficiently robust to guarantee the safety of the AMB system. Many approaches have been put forward in the literature to estimate the rotor dynamic motion, nonetheless most of them focus on the horizontal rotor drop and few consider the inclination around the horizontal plane for the vertical rotor. The main purpose of this paper is to predict the rotor dynamic behavior accurately for the vertical rotor drop case. A detailed model for the vertical rotor drop process with consideration of the rotating inclination around x- and y-axes is proposed in this paper. Additionally, rolling and sliding friction are distinguished in the simulation scenario. This model has been applied to estimate the rotor drop process in a helium circulator system equipped with AMBs for the 10 MW high-temperature gas-cooled reactor (HTR-10). The HTR-10 has been designed and researched by the Institute of Nuclear and New Energy Technology (INET) of Tsinghua University. The auxiliary bearing is utilized to support the rotor in the helium circulator. The validity of this model is verified by the results obtained in this paper as well. This paper also provides suggestions for the further improvement of auxiliary bearing design and engineering application.

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Section: Introductionmentioning

confidence: 58%

Section: Axial Interaction Between the Rotor And The Auxiliary Bearingsmentioning

confidence: 99%

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Dynamic Analysis for the Rotor Drop Process and Its Application to a Vertically Levitated Rotor/Active Magnetic Bearing System

Zhao

Yang

Keogh

et al. 2017

Journal of Tribology

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“…The data in the experiments are attained from 21 touchdown experiments on the backup helium circulator system of HTR-10. A detailed description of this system can be found in [11,13,33]. These experiments are performed with various conditions; for example, the brake of drive motor will be applied and an additional axial load (about 2000 N) will be applied by an axial loader [29].…”

Section: Experiments Setupmentioning

confidence: 99%

Dynamic Behavior Analysis of Touchdown Process in Active Magnetic Bearing System Based on a Machine Learning Method

Sun

Yan

Zhao

et al. 2017

Science and Technology of Nuclear Installations

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Magnetic bearings are widely applied in High Temperature Gas-cooled Reactor (HTGR) and auxiliary bearings are important backup and safety components in AMB systems. The performance of auxiliary bearings significantly affects the reliability, safety, and serviceability of the AMB system, the rotating equipment, and the whole reactor. Research on the dynamic behavior during the touchdown process is crucial for analyzing the severity of the touchdown. In this paper, a data-based dynamic analysis method of the touchdown process is proposed. The dynamic model of the touchdown process is firstly established. In this model, some specific mechanical parameters are regarded as functions of deformation of auxiliary bearing and velocity of rotor firstly; furthermore, a machine learning method is utilized to model these function relationships. Based on the dynamic model and the Kalman filtering technique, the proposed method can offer estimation of the rotor motion state from noisy observations. In addition, the estimation precision is significantly improved compared with the method without learning. The proposed method is validated by the experimental data from touchdown experiments.

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Preliminary Evaluation of Impact Forces in Rotor Drop of the AMB-rotor System in Space Reactor

Zhao

Ding

Zhang

et al. 2023

Springer Proceedings in Physics

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Dynamic Behavior of the AMB’s Vertical Arranged Rotor During Its Drop Process

Cited by 6 publications

References 0 publications

Dynamic Analysis for the Rotor Drop Process and Its Application to a Vertically Levitated Rotor/Active Magnetic Bearing System

Dynamic Analysis for the Rotor Drop Process and Its Application to a Vertically Levitated Rotor/Active Magnetic Bearing System

Dynamic Behavior Analysis of Touchdown Process in Active Magnetic Bearing System Based on a Machine Learning Method

Preliminary Evaluation of Impact Forces in Rotor Drop of the AMB-rotor System in Space Reactor

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