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Research Papers: Hydrodynamic Lubrication

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

[+] Author and Article Information
Yulan Zhao, Guojun Yang, Lei Zhao

Key Laboratory of Advanced Reactor Engineering
and Safety, Ministry of Education,
Collaborative Innovation Center of Advanced
Nuclear Energy Technology,
Institute of Nuclear and New Energy Technology,
Tsinghua University,
Beijing 100084, China

Patrick Keogh

Department of Mechanical Engineering,
University of Bath,
Bath BA2 7AY, UK

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 21, 2016; final manuscript received November 19, 2016; published online April 4, 2017. Assoc. Editor: Daejong Kim.

J. Tribol 139(4), 041701 (Apr 04, 2017) (15 pages) Paper No: TRIB-16-1131; doi: 10.1115/1.4035343 History: Received April 21, 2016; Revised November 19, 2016

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.

Copyright © 2017 by ASME
Topics: Bearings , Rotors
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References

Figures

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Fig. 1

Rotor/auxiliary bearing system layout

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Fig. 2

Rotor motion in fixed and rotating coordinates

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Fig. 3

Dynamic interactions

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Fig. 4

Predicted axial displacement, case I-1

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Fig. 5

Axial velocity, case I-1

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Fig. 6

Experimental axial displacement, case I-1

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Fig. 7

Predicted upper rotor orbit, case I-1

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Fig. 8

Predicted lower rotor orbit, case I-1

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Fig. 9

Experimental upper rotor orbit, case I-1

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Fig. 10

Experimental lower rotor orbit, case I-1

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Fig. 11

Predicted angle around x-axis, case I-1

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Fig. 12

Predicted angle around y-axis, case I-1

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Fig. 13

Rotor velocity, case I-1

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Fig. 14

Bearing velocity, case I-1

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Fig. 15

Whirling velocity, case I-1

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Fig. 16

Axial contact force, case I-1

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Fig. 17

Axial friction torque, case I-1

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Fig. 18

Upper radial contact force, case I-1

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Fig. 19

Upper radial friction force, case I-1

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Fig. 20

Lower radial contact force, case I-1

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Fig. 21

Lower radial friction force, case I-1

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Fig. 22

Predicted rotor orbits

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Fig. 23

Predicted rotor orbit

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Fig. 24

Predicted whirling velocity

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Fig. 26

Predicted rotor orbit

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Fig. 27

Experimental rotor orbit

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Fig. 28

Predicted whirling velocity

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Fig. 30

Predicted upper rotor orbit, case IV

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Fig. 31

Predicted lower rotor orbit, case IV

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Fig. 32

Predicted axial displacement, case IV

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Fig. 33

Experimental upper rotor orbit, case IV

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Fig. 34

Experimental lower rotor orbit, case IV

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Fig. 35

Experimental axial displacement, case IV

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Fig. 36

Axial contact force, case IV

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Fig. 37

Upper radial contact force, case IV

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Fig. 38

Lower radial contact force, case IV

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Fig. 39

Rotor velocity, case IV

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Fig. 40

Bearing velocity, case IV

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