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http://dx.doi.org/10.9725/kts.2022.38.2.53

Measurements and Predictions of Rotodynamic Performance of a Motor-Driven Small Turbocompressor Supported on Oil-Free Foil Bearings  

Baek, Doo San (Graduate School, Dept. of Mechanics and Design, Kookmin University)
Hwang, Sung Ho (Graduate School, Dept. of Mechanics and Design, Kookmin University)
Kim, Tae Ho (School of Mechanical Engineering, Kookmin University)
Lee, Jong Sung (APIC Center, Fuel-cell Component Team, Hanon Systems)
Kim, Tae Young (Fuel Cell Engineering Design Team, Hyundai Motor Company)
Publication Information
Tribology and Lubricants / v.38, no.2, 2022 , pp. 53-62 More about this Journal
Abstract
This study presents experimental measurements of the rotordynamic performance of a motor-driven small turbocompressor supported by gas beam foil journal bearings (GBFJBs) and compares the test results with the predictions of a computational model. The experiments confirmed that the rotational synchronous frequency component dominates the behavior of the overall rotor vibrations, whereas the nonsynchronous components are insignificant, indicating the rotor-bearing system remains stable up to 100 krpm. The undamped natural frequency and imbalanced response of the rotor-bearing system are predicted when integrating the finite element model of the rotor-bearing system with the predictions of the bearing dynamic coefficients. The results are in good agreement with the experimental results. In addition, base excitation test results show that the small turbocompressor can endure large external forces and demonstrate limited rotor amplitudes. A simple single degreeof-freedom rotor model using the nonlinear stiffness of the GBFJBs can effectively predict the test results.
Keywords
High speed motor; Beam foil; Gas foil bearing; Rotordynamics; Base excitation;
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Times Cited By KSCI : 5  (Citation Analysis)
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