In this study, experimental and analytical analyses of the vibration stability of a 225 kW class turbo blower with a hybrid foil–magnetic bearing (HFMB) were performed. First, critical speed and unbalance vibration responses were examined as part of the rotordynamic research. Its shaft diameter was 71.5 mm, its total length was 693 mm, and the weight of the rotor was 17.8 kg. The air foil bearing (AFB) utilized was 50 mm long and had a 0.7 aspect ratio. In the experiments conducted, excessive vibration and rotor motion instability occurred in the range 12,000–15,000 rpm, which resulted from insufficient dynamic pressure caused by the length of the foil bearing being too short. Consequently, as the rotor speed increased, excessive rotor motion attributable to aerodynamic and bearing instability became evident. This study therefore focused on improving rotordynamic performance by rectifying rigid mode unstable vibration at low speed, 20,000 rpm, and asynchronous vibration due to aerodynamic instability by using HFMB with vibration control. The experimental results obtained were compared for each bearing type (AFB and HFMB) to improve the performance of the vibration in the low-speed region. The experimental results show that the HFMB technology results in superior vibration stability for unbalance vibration and aerodynamic instability in the range 12,000–15,000 rpm (200–250 Hz). The remarkable vibration reduction achieved from vibration control of the HFMB–rotor system shows that oil-free turbomachinery can achieve excellent performance.
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Rigid Mode Vibration Control and Dynamic Behavior of Hybrid Foil–Magnetic Bearing Turbo Blower
Sena Jeong,
Sena Jeong
Center for Urban Energy Research,
Korea Institute of Science and Technology,
Seoul 02792, South Korea
e-mail: senaj@kist.re.kr
Korea Institute of Science and Technology,
Seoul 02792, South Korea
e-mail: senaj@kist.re.kr
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Doyoung Jeon,
Doyoung Jeon
Department of Mechanical Engineering,
Sogang University,
Seoul 04107, South Korea
e-mail: dyjeon@sogang.ac.kr
Sogang University,
Seoul 04107, South Korea
e-mail: dyjeon@sogang.ac.kr
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Yong Bok Lee
Yong Bok Lee
Center for Urban Energy Research,
Korea Institute of Science and Technology,
Seoul 02792, South Korea
e-mail: lyb@kist.re.kr
Korea Institute of Science and Technology,
Seoul 02792, South Korea
e-mail: lyb@kist.re.kr
Search for other works by this author on:
Sena Jeong
Center for Urban Energy Research,
Korea Institute of Science and Technology,
Seoul 02792, South Korea
e-mail: senaj@kist.re.kr
Korea Institute of Science and Technology,
Seoul 02792, South Korea
e-mail: senaj@kist.re.kr
Doyoung Jeon
Department of Mechanical Engineering,
Sogang University,
Seoul 04107, South Korea
e-mail: dyjeon@sogang.ac.kr
Sogang University,
Seoul 04107, South Korea
e-mail: dyjeon@sogang.ac.kr
Yong Bok Lee
Center for Urban Energy Research,
Korea Institute of Science and Technology,
Seoul 02792, South Korea
e-mail: lyb@kist.re.kr
Korea Institute of Science and Technology,
Seoul 02792, South Korea
e-mail: lyb@kist.re.kr
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 August 12, 2016; final manuscript received August 17, 2016; published online November 22, 2016. Editor: David Wisler.
J. Eng. Gas Turbines Power. May 2017, 139(5): 052501 (12 pages)
Published Online: November 22, 2016
Article history
Received:
August 12, 2016
Revised:
August 17, 2016
Citation
Jeong, S., Jeon, D., and Lee, Y. B. (November 22, 2016). "Rigid Mode Vibration Control and Dynamic Behavior of Hybrid Foil–Magnetic Bearing Turbo Blower." ASME. J. Eng. Gas Turbines Power. May 2017; 139(5): 052501. https://doi.org/10.1115/1.4034920
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