표면이 마모된 틸팅 패드 저널베어링의 열윤활 해석 및 온도 측정
Thermohydrodynamic Analysis and Pad Temperature Measurement of Tilting Pad Journal Bearing with Worn Pad
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tilting pad With the increase in adoption of tilting pad journal bearings (TPJBs), various failure mechanisms related to TPJBs have been reported, of which pad wear is a frequently reported one. Pad wear causes change in geometry of the bearing, which can sometimes result in the failure of the entire system. The objective of this research is to investigate the influence of pad wear on the pad temperature, which is one of the widely used condition monitoring methods for TPJBs. For the theoretical investigation, thermohydrodynamic (THD) analysis was conducted by solving the generalized Reynolds equation and the 3D energy equation. The results of the analysis show that the temperature of the loaded pad increases while that of the unloaded pad decreases, when there is wear on the loaded pads. In addition, the minimum film thickness decreases with an increase in the wear depth. A validation test was conducted with a test rig, which mimics the axial turbine when a test rotor is supported by two TPJBs. The test bearing consists of five pads with a diameter of 60 mm, and a resistance temperature detector (RTD) is installed in the pad for temperature monitoring. The test was performed by replacing the two loaded pads with the worn pad. The test result for the TPJB with wear depth of 30 μm show that the temperatures of the loaded pads are 8 °C higher and that of the unloaded pad is 2.5 °C lower than that of the normal TPJB. In addition, the predicted pad temperature shows good agreement with the measured pad temperatures.bearing, wear, thermohydrodynamic analysis
Abstract
tilting pad With the increase in adoption of tilting pad journal bearings (TPJBs), various failure mechanisms related to TPJBs have been reported, of which pad wear is a frequently reported one. Pad wear causes change in geometry of the bearing, which can sometimes result in the failure of the entire system. The objective of this research is to investigate the influence of pad wear on the pad temperature, which is one of the widely used condition monitoring methods for TPJBs. For the theoretical investigation, thermohydrodynamic (THD) analysis was conducted by solving the generalized Reynolds equation and the 3D energy equation. The results of the analysis show that the temperature of the loaded pad increases while that of the unloaded pad decreases, when there is wear on the loaded pads. In addition, the minimum film thickness decreases with an increase in the wear depth. A validation test was conducted with a test rig, which mimics the axial turbine when a test rotor is supported by two TPJBs. The test bearing consists of five pads with a diameter of 60 mm, and a resistance temperature detector (RTD) is installed in the pad for temperature monitoring. The test was performed by replacing the two loaded pads with the worn pad. The test result for the TPJB with wear depth of 30 μm show that the temperatures of the loaded pads are 8 °C higher and that of the unloaded pad is 2.5 °C lower than that of the normal TPJB. In addition, the predicted pad temperature shows good agreement with the measured pad temperatures.bearing, wear, thermohydrodynamic analysis
참고문헌 (18)
- Ettles, C. M. McC, "The analysis and performance of pivoted pad journal bearings considering thermal and elastic effects", Journal of Lubrication Technology, 102(2), pp.182~191 (1980)
- Knight, J. D., "Analysis of tilting pad journal bearings with heat transfer effects", Journal of Tribology, 110(1), pp.128~133 (1988)
- Brugier, D., "Influence of elastic deformations of Turbo-Generator tilting pad bearings on the static behavior and on the dynamic coefficients in different designs", Journal of Tribology, 111(2), pp.364~371 (1989)
- Taniguchi, S., "A thermohydrbdynamic analysis of large tiltingpad journal bearing in laminar and turbulent flow regimes with mixing", Journal of Tribology, 112(3), pp.542~548 (1990)
- Suh, J., "Three-dimensional dynamic model of TEHD Tilting-pad journal Bearing—Part I : Theoretical modeling", Journal of Tribology, 137(4), pp.014703~ (2015)
- Su, J., "Three-dimensional dynamic model of TEHD Tilting-Pad Journal Bearing—Part II : Parametric studies", Journal of Tribology, 137(4), pp.014704~ (2015)
- Fillon, M., "Experimental study of Tilting-Pad Journal Bearings—Comparison with theoretical thermoelastohydrodynamic results", Journal of Tribology, 114(3), pp.579~587 (1992)
- Bang, K., "Comparison of power loss and pad temperature for leading edge groove tilting pad journal bearings and conventional tilting pad journal bearings", Tribology International, 43, pp.1287~1293 (2010)
- Wygant, K. D., "Measured performance of Tilting-Pad journal bearings over a range of Preloads—Part I: Static operating conditions", Tribology Transactions, 47(4), pp.576~584 (2004)
- 서준호, "열변형으로 인한 틸팅패드 저널베어링의 예압 변화", 한국윤활학회지, 32(1), pp.1~8 (2016), 한국윤활학회[DOI]
- 김태호, "로커-백 피벗을 갖는 틸팅 패드 저널 베어링의 회전체동역학적 성능 예측 및 기존 결과와의 비교", 한국윤활학회지, 31(6), pp.294~301 (2015), 한국윤활학회[DOI]
- 이태원, "유한 요소 해석을 통해 계산된 틸팅 패드 베어링의 피봇강성과 Hertzian 접촉 모델 해석 결과 비교", 한국윤활학회지, 30(4), pp.205~211 (2014), 한국윤활학회[DOI]
- Whalen, J. K., "Babbitted Bearing Health Assessment", Proceedings of the Forty First Turbomachinery Symposium (2012)
- Dufrane, K. F., "Wear of steam turbine journal bearings at low operating speeds", Journal of Lubrication Technology, 105(2), pp.182~191 (1983)
- Kumar, A., "Steady state analysis of noncircular worn journal bearings in nonlaminar lubrication regimes", Tribology International, 29(6), pp.493~498 (1996)
- Scharrer, J. K., "The Effects of wear on the rotordynamic coefficients of a hydrostatic journal bearing", Journal of Tribology, 113(1), pp.210~213 (1991)
- Fillon, M., "Thermohydrodynamic analysis of a worn plain journal bearing", Tribology International, 37(4), pp.129~136 (2004)
- 이동현, "터빈 시뮬레이터용 틸팅패드 저널베어링의 열윤활 해석 및 패드 온도 측정", 한국윤활학회지, 33(3), pp.112~118 (2017), 한국윤활학회[DOI]