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Research Papers: Gas Turbines: Structures and Dynamics

Dynamic Analysis of Active Magnetic Bearing Rotor Dropping on Auto-eliminating Clearance Auxiliary Bearing Devices

[+] Author and Article Information
Chengtao Yu

College of Mechanical
and Electrical Engineering,
Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China
e-mail: yuchengtao1119@126.com; yuchengtao1119@nuaa.edu.cn

Chaowu Jin

College of Mechanical
and Electrical Engineering,
Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China
e-mail: jinchaowu@nuaa.edu.cn

Xudong Yu

School of Mechanical
and Aerospace Engineering,
Nanyang Technological University,
50 Nanyang Avenue,
Singapore 639798
e-mail: xudong8140@gmail.com

Longxiang Xu

College of Mechanical
and Electrical Engineering,
Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China
e-mail: fqp@nuaa.edu.cn

1Corresponding author.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received January 14, 2014; final manuscript received October 16, 2014; published online December 9, 2014. Assoc. Editor: Patrick S. Keogh.

J. Eng. Gas Turbines Power 137(6), 062502 (Jun 01, 2015) (14 pages) Paper No: GTP-14-1028; doi: 10.1115/1.4029054 History: Received January 14, 2014; Revised October 16, 2014; Online December 09, 2014

Auto-eliminating clearance auxiliary bearing devices (ACABD) can automatically eliminate the protective clearance between the ball bearing's outer race and the ACABD's supports, thus recenter the rotor when active magnetic bearing (AMB) system fails. This paper introduces the mechanical structure and working principles of the ACABD. When the rotor drops, numerical and experimental studies on the transient responses of the rotor and the ACABD's supports are also conducted as follows. First, we propose an equivalent clearance circle method to establish dynamic models of rotor dropping on the ACABD. Based on these models, the rotor dropping simulations are carried out to investigate the modes of lubrication and the ACABD's support shape's influences on the performance and execution time of clearance elimination. Second, various AMB rotor dropping tests are performed on our experimental setup with different ACABD supporting conditions. Indicated from the basically consistent simulation and experimental results, the correctness of the theoretical analysis and the successful operation of ACABD have been verified. Moreover, with the grease lubrication in the ball bearing and convex shape supports, the ACABD can eliminate the protective clearance within approximately 0.5 s upon the rotor drops and then sustain the rotor to operate stably around its original rotation center. Because of clearance elimination, the dramatic impact between the ball bearing and the supports is avoided and the impact forces among each part are effectively reduced. Meanwhile, the possibility of incurring full-clearance backward whirling motion is eliminated.

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Figures

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Fig. 1

ACABD concept sketch

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Fig. 2

Rotor structure and mechanical model

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Fig. 3

Ball bearing model

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Fig. 4

Clearance in situations with different support shapes

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Fig. 5

Model of impact process between outer race and swing supports

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Fig. 6

Orbits of the rotor's center

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Fig. 7

Rotor's vibration displacements in x- and y-directions

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Fig. 8

Rotational frequency of the rotor

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Fig. 9

Rotational frequency of the outer race

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Fig. 10

Angular motion of supports

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Fig. 11

Internal impact force in ball bearing

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Fig. 12

Impact force between outer race and supports

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Fig. 14

Three tested ACABDs

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Fig. 15

Experimental facility

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Fig. 16

Orbits of the rotor's center—experimental results

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Fig. 17

Vibration displacements of the rotor in x- and y-directions—experimental results

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Fig. 18

Rotational frequency of the rotor—experimental results

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Fig. 19

Rotational frequency of the outer race—experimental results

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Fig. 20

Experimental results of rotor dropping on conventional auxiliary bearing

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