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Research Papers: Hydrodynamic Lubrication

Dynamic Analysis for the Rotor Drop Process and Its Application to a Horizontal Rotor-Active Magnetic Bearing System in Helium Gas

[+] Author and Article Information
Zhao Yulan, Liu Xingnan, Shi Zhengang, Zhao Lei

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

Yang Guojun

The Key Laboratory of Advanced
Reactor Engineering and Safety,
Collaborative Innovation Center of
Advanced Nuclear Energy Technology,
Institute of Nuclear and New Energy
Technology of Tsinghua University,
Ministry of Education,
Beijing 100084, China
e-mail: yanggj@tsinghua.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 15, 2017; final manuscript received November 11, 2017; published online February 22, 2018. Assoc. Editor: Daejong Kim.

J. Tribol 140(4), 041704 (Feb 22, 2018) (14 pages) Paper No: TRIB-17-1233; doi: 10.1115/1.4039143 History: Received June 15, 2017; Revised November 11, 2017

The high-temperature gas-cooled reactor pebble-bed modular (HTR-PM) has been proposed by the Institute of Nuclear and New Energy Technology of Tsinghua University, in which the active magnetic bearings (AMBs) are equipped to support the high-speed rotor in the helium circulator system. In the case of AMB failures, emergencies, or overload conditions, the auxiliary bearing is applied as the backup protector to provide temporary mechanical support and displacement constraint for the dropping rotor. A detailed dynamic model is established to reveal the behavior of the dropping rotor. This model is able to describe the rotor displacement and inclination around each axis. The left and right rotor orbits are revealed. Dropping experiments are also carried out to reveal the actual behavior of the dropping rotor in helium. The predicted and experimental results will benefit further study, design, and application of the auxiliary bearing in HTR-PM helium circulator.

Copyright © 2018 by ASME
Topics: Bearings , Rotors , Helium
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References

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Figures

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Fig. 2

Rotor/auxiliary bearings interactions

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Fig. 1

Rotor motion in fixed and rotating coordinates

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Fig. 3

The cross section of the test rig

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Fig. 6

Structure of the CL-YB-30 sensor: 1—mounting flange (sensor installed), 2—bearing housing, 3—auxiliary bearing, and 4—cover of auxiliary bearing

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Fig. 7

Layout of the strain gauge

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Fig. 13

Left and right rotor orbit: 3000 rpm; eccentricity: 0.01 mm

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Fig. 14

Left and right rotor orbit: 3000 rpm; eccentricity: 0.02 mm

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Fig. 15

Predicted left rotor orbit: 1000 rpm

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Fig. 16

Predicted right rotor orbit: 1000 rpm

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Fig. 17

Predicted left contact force: 1000 rpm

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Fig. 18

Predicted right contact force: 1000 rpm

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Fig. 19

Predicted rotor orbit: 3000 rpm

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Fig. 8

Predicted left rotor orbit

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Fig. 9

Predicted right rotor orbit

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Fig. 10

Predicted left contact force

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Fig. 11

Predicted right contact force

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Fig. 12

Initial dropping direction

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Fig. 20

Predicted left rotor orbit: 0.25

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Fig. 21

Predicted right rotor orbit: 0.25

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Fig. 22

Predicted left contact force: 0.25

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Fig. 23

Predicted right contact force: 0.25

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Fig. 24

Measured rotor orbits: vacuum, 0.1 MPa, 0.2 MPa

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Fig. 31

Measured contact forces: 0.1 MPa, 40 Hz

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Fig. 32

Measured contact forces: 0.1 MPa, 60 Hz

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Fig. 33

Measured contact forces: 0.1 MPa, 80 Hz

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Fig. 25

Measured contact forces: vacuum, 50 Hz

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Fig. 26

Measured contact forces: 0.1 MPa, 50 Hz

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Fig. 27

Measured contact forces: 0.2 MPa, 50 Hz

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Fig. 28

The comparison of the rotor orbit

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Fig. 29

Measured rotor orbits: 20, 40, 60, and 80 Hz

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Fig. 30

Measured contact forces: 0.1 MPa, 20 Hz

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