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Research Papers

Dynamics of Flywheel Energy Storage System With Permanent Magnetic Bearing and Spiral Groove Bearing

[+] Author and Article Information
Yujiang Qiu

School of Mechanical Engineering,
Southeast University,
2 Southeast Road,
JiangNing District,
Nanjing 211189, China

Shuyun Jiang

School of Mechanical Engineering,
Southeast University,
2 Southeast Road,
JiangNing District,
Nanjing 211189, China
e-mail: jiangshy@seu.edu.cn

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received February 8, 2017; final manuscript received July 7, 2017; published online September 20, 2017. Assoc. Editor: Davide Spinello.

J. Dyn. Sys., Meas., Control 140(2), 021006 (Sep 20, 2017) (8 pages) Paper No: DS-17-1074; doi: 10.1115/1.4037297 History: Received February 08, 2017; Revised July 07, 2017

Developing a flywheel energy storage system (FESS) with permanent magnetic bearing (PMB) and spiral groove bearing (SGB) brings a great challenge to dynamic control for the rotor system. In this paper, a pendulum-tuned mass damper is developed for 100 kg-class FESS to suppress low-frequency vibration of the system; the dynamic model with four degrees-of-freedom is built for the FESS using Lagrange's theorem; mode characteristics, critical speeds, and unbalance responses of the system are analyzed via theory and experiment. A comparison between the theoretical results and the experiment ones shows that the pendulum-tuned mass damper is effective, the dynamic model is appropriate, and the FESS can run smoothly within the working speed range.

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References

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Figures

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Fig. 1

(a) The schematic of the FESS and (b) dynamic model of rotor-bearing system for FESS

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Fig. 3

The detail structure of the lower support

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Fig. 2

The detail structure of the upper support

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Fig. 4

Modal identification system of rotor-bearing system: (a) the schematic and (b) the photos

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Fig. 5

Modal frequencies and shapes of the FESS: (a) theoretical results and (b) test results

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Fig. 6 (a)

Damping ratios and (b) frequencies of the first-order mode

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Fig. 7

Modal frequencies of the FESS

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Fig. 8

Test rig of unbalance response for the FESS: (a) the schematic, (b) and (c) photos of FESS and measuring system

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Fig. 9

Amplitude-frequency responses at: (a) the flywheel top and (b) the lower damper

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Fig. 10

The dynamic behavior of the FESS: (a) being stationary, (b) within first critical speed, and (c) exceeding critical speed

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