김태호 최태규 김충현 2024-01-20T05:31:49Z 2024-01-20T05:31:49Z 2021-09-06 2015-12 2713-8011 https://pubs.kist.re.kr/handle/201004/124665 In this paper, we predict the rotordynamic force coefficients of tilting pad journal bearings (TPJBs) with rocker-back pivots, and we compare the predictions to recently published predictions and test data. The present TPJB model considers the rocker-back pivot stiffness calculated based on the Hertzian contact-stress theory, which is nonlinear with the application of a force . For the five-pad TPJB in load-between-pad and loadon- pad configurations, the predictions show the pressure- and film-thickness distributions, the deflection and stiffness of the individual pivots, and bearing stiffness and damping coefficients. The minimum film thickness and peak pressure occur at the bottom pad on which the applied load is directed. Because of the preload, the pressure is positive even at the upper pad in the opposite direction to the applied load. The pivot deflection and stiffness are maximum at the bottom pad that receives the heaviest pressure load. The predicted stiffness coefficients increase as the static load and rotor speed increase, while the damping coefficients decrease as the rotor speed increases, but increase as the static load increases. In general, the predicted stiffness coefficients agree well with the test data. The predicted damping coefficients overestimate the test data, particularly for large static loads. In general, the current predictive model considering the pivot stiffness improves the accuracy of the rotordynamic performance compared to previously reported models. Korean 한국트라이볼로지학회 로커-백 피벗을 갖는 틸팅 패드 저널 베어링의 회전체동역학적 성능 예측 및 기존 결과와의 비교 Rotordynamic Performance Predictions of Tilting Pad Journal Bearing with Rocker-Back Pivots and Comparison with Published Test Results Article 10.9725/kstle.2015.31.6.294 2 한국트라이볼로지학회지, v.31, no.6, pp.294 - 301 한국트라이볼로지학회지 31 6 294 301 kci ART002070711 감쇠 피벗 강성 로커-백 피벗 강성 틸팅 패드 저널 베어링 damping pivot stiffness rocker-back pivot stiffness tilting pad journal bearing