무급유 포일 베어링으로 지지되는 소형 전동 압축기의회전체동역학 성능 측정 및 예측
Measurements and Predictions of Rotodynamic Performance ofa Motor-Driven Small Turbocompressor Supportedon Oil-Free Foil Bearings
0
조회
0
다운로드
3
인용
0
참고문헌
키워드
초록
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 degree-of-freedom rotor model using the nonlinear stiffness of the GBFJBs can effectively predict the test results.
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 degree-of-freedom rotor model using the nonlinear stiffness of the GBFJBs can effectively predict the test results.
참고문헌 (18)
- Heshmat, H, "Advancements in the Performance of Aerodynamic Foil Journal Bearings: High Speed and Load Capacity", ASME J. Tribol, 116, pp.287~295 (1994)
- 김영철, "이중범프 공기포일베어링의 성능시험", 한국트라이볼로지학회지, 25(2), pp.108~113 (2009), 한국트라이볼로지학회
- Lee, Y. B, "Dynamic Characteristics of a Flexible Rotor System Supported by a Viscoelastic Foil Bearing(VEFB)", Tribol. Int, 37(9), pp.679~687 (2004)[DOI]
- Static Structural Characterization of Multilayer Gas Foil Journal Bearings, "Kim, T. H", ASME, ~, pp.ASME Paper, No. GT2015-43959 (2015)
- 백두산, "고속 전동기용 무급유 포일 저널 베어링 구조체의 하중지지 및 진동 특성 규명", 한국트라이볼로지학회지, 37(6), pp.261~272 (2021), 한국트라이볼로지학회[DOI]
- Radil, K, "The Role of Radial Clearance on the Performance of Foil Air Bearings", STLE Tribol. Trans, 45(4), pp.485~490 (2002)
- Kim, T. H, "Effects of a Mechanical Preload on the Dynamic Force Response of Gas Foil Bearings : Measurements and Model Predictions", STLE Tribol. Trans, 52(4), pp.569~580 (2009)[DOI]
- Rotordynamic Performance Measurements and Predictions of a Rotor Supported on Multilayer Gas Foil Journal Bearings for Microturbomachinery, "Lee, J", ASME, ~, pp.ASME Paper, No. GT2016-56283 (2016)
- 황성호, "심포일을 갖는 가스 포일 저널 베어링의 성능 예측", 한국트라이볼로지학회지, 34(3), pp.107~114 (2018), 한국트라이볼로지학회[DOI]
- 황성호, "가스 포일 베어링으로 지지되는 연료전지 전기자동차용 공기압축기의 회전체동역학적 성능 측정 및 예측", 한국트라이볼로지학회지, 35(1), pp.44~51 (2019), 한국트라이볼로지학회[DOI]
- 김태호, "수소전기차용 공기압축기의 NVH 특성 규명", 한국소음진동공학회논문집, 29(3), pp.368~378 (2019), 한국소음진동공학회[DOI]
- San Andrés, L, "Rotordynamic Performance of a Rotor Supported on Bump Type Foil Bas Bearings: Experiments and Predictions", ASME J. Eng. Gas Turbines and Power, 129(3), pp.850~857 (2007)[DOI]
- San Andrés, L, "Forced Nonlinear Response of Gas Foil Bearing Supported Rotors", Tribol. Int, 41(8), pp.704~715 (2008)[DOI]
- Duffing’s Vibration of a Rotor Supported on Gas Foil Bearings with Base Excitation : Measurements and Model Predictions, "Kim, T. H", ASME, ~, pp.ASME Paper, No.GT2016-56281 (2016)
- 문형욱, "볼 베어링 및 가스 포일 베어링으로 지지되는 고속 전동기의 회전체 관성정지 및 가속 성능 연구", 한국트라이볼로지학회지, 35(2), pp.123~131 (2019), 한국트라이볼로지학회[DOI]
- Kim, T. H, "Analysis of advanced gas foil bearings with piecewise linear elastic supports", Tribol. Int, 40(8), pp.1239~1245 (2007)[DOI]
- Inman, D. J, "Engineering Vibration, 4" (1994), Prentice Hall
- Jordan D. W, "Nonlinear Ordinary Differential Equations", pp.237~276 (1999), Oxford University Press