Multiphysics Software를 활용한 원심 압축기용 틸팅 패드 저널 베어링 특성과 회전체 동역학 분석 = Analysis of Tilting Pad Journal Bearing Characteristics andRotordynamics for Centrifugal Compressors Using Multiphysics Software

다국어 초록 (Multilingual Abstract)

This study explores the characteristics of tilting pad journal bearings used in the high-speed rotating shaft systems of centrifugal compressors. A centrifugal compressor is a high-speed rotating machine that is widely used to compress gases or vapors employed in various industrial applications. It transfers the centrifugal force of a fast-spinning impeller to the fluid and compresses it under high pressure. Many high-speed rotating shaft systems, which require high stability, use tilting pad journal bearings. The characteristics of these bearings can vary depending on several properties, and identifying the appropriate characteristics is essential to optimize the design on a case-to-case basis. In this study, the authors perform a time-dependent analysis of the properties of tilting pad journal bearings and the rotordynamics of the rotating shaft system using COMSOL Multiphysics software. Specifically, the authors analyze the characteristics of the tilting pad journal bearings by performing a parametric sweep using parameters such as pad clearance, maximum tilting angle, preload, number of pads, and pad pivot offset. The authors then use the results of the bearing-characteristics analysis to evaluate the vibration of the rotating shaft and verify its operation within a desirable range. The understanding gained from this study will allow us to determine the optimal properties of these bearings and the limiting operational speed using COMSOL Multiphysics software.

참고문헌 (Reference)

1 이안성, "프로세스 고속 경량 원심 압축기의 로터다이나믹 안정성 강화를 위한 설계해석 − Part II: 로터다이나믹 안정성 개선" 한국트라이볼로지학회 30 (30): 9-14, 2014

2 백두산 ; 황성호 ; 김태호 ; 이종성 ; 김태영, "무급유 포일 베어링으로 지지되는 소형 전동 압축기의회전체동역학 성능 측정 및 예측" 한국트라이볼로지학회 38 (38): 53-62, 2022

3 J. C. Nicholas, "Tilting Pad Bearing Design"

4 Jeong, S., "A Study on the Improvement of Rotordynamics Prediction Accuracy of Integrally-geared Turbo Compressor with Tilting Pad Journal Bearing" Proceedings of the KSFM Winter Conference 2022