Dynamic Stability Study of Static Gas Bearing for Small Cryogenic Turbo-Expander

WANG Xuemin; ZHUANG Ming; ZHANG Qiyong; LI Shanshan; FU Bao

Plasma Science and Technology > 2011 > 13(4): 506-512.

WANG Xuemin, ZHUANG Ming, ZHANG Qiyong, LI Shanshan, FU Bao. Dynamic Stability Study of Static Gas Bearing for Small Cryogenic Turbo-Expander[J]. Plasma Science and Technology, 2011, 13(4): 506-512.

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Dynamic Stability Study of Static Gas Bearing for Small Cryogenic Turbo-Expander

Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China

Funds: supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (NO. KJCX2-YW-N16)

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Received Date: October 28, 2010

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Abstract

Abstract

An experimental method is presented to analyze the dynamic stability of the gas bearing for small cryogenic turbo-expanders. The rotation imbalance response and the shape of the rotor orbit were obtained for different speeds up to 110,000 rpm, and the critical speed of the rotor-bearing system was determined by a Bode diagram. An FFT signal analytical method was applied to identify the resonance frequency, and the waterfall plot was presented. During the whole process of speeding up to the designed speed of 110,000 rpm, the rotor-bearing works stably with no whirl instability, which is validated in a waterfall plot. Also, the tested rotor-bearing model was analyzed theoretically. It was proved that the experimental results were highly consistent with the those of theoretical calculations. Thus the experimental method proposed here to analyze the dynamic stability of the gas bearing is feasible.
- rotor-bearing,
- stability,
- imbalance,
- whirl,
- stability,
- imbalance,
- whirl

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