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http://dx.doi.org/10.9725/kts.2021.37.6.261

Identification of Load Carrying and Vibration Characteristics of Oil-Free Foil Journal Bearing Structures for High Speed Motors  

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)
Publication Information
Tribology and Lubricants / v.37, no.6, 2021 , pp. 261-272 More about this Journal
Abstract
This study investigates the structural characteristics of oil-free, gas beam foil journal bearings (GBFJBs) for use in high speed motors. Mathematical modeling was carried out, and reaction force modeling for static load was performed to predict the structural characteristics of the GBFJB. Mathematical modeling and reaction force modeling for static load are performed to predict the structural characteristics of GBFJBs. The reaction force of the test bearing against static loads was measured during experiments and compared with the predicted results. The measured experimental data reveal the nonlinear stiffness characteristics of the GBFJB against varying displacement and agree well with the predictions. Dynamic load tests using an exciter allow to identify the vibration characteristics of the GBFJB. Test results show that the vibration displacement, dynamic force, and acceleration measured on the test bearing are most dominant at the applied dynamic load (synchronization) frequency. Futhermore, the test results show that the hysteresis area recorded during the dynamic tests increases with the excitation amplitude and frequency, and that the beam stick phenomena occurr at high excitation frequencies. The single degree of freedom (DOF) vibration model aids to identify the stiffness and damping coefficient of the GBFJB, which decrease as the excitation frequency increases.
Keywords
high speed motor; beam foil; gas foil bearing; rotordynamics; structural characteristics;
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