탄성변형으로 인한 틸팅패드 저널베어링의 예압 변화
Elastic Deformation Induced Preload Change inTilting Pad Journal Bearing
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초록
This study aims to quantify the variation in the performance of a tilting pad journal bearing (TPJB) owing to the elastic deformation of its pad. To this end, we first defined a parameter, “elastic preload”, and predicted the changes in the performance of the TPJB, as a function of the preload amount. We used the iso-viscosity Reynolds equation, which ignores the temperature rise due to viscous shear in thin films, and the resultant thermal deformation of the bearing structure. We employed a three-dimensional finite element model to predict the elastic deformation of the bearing pad, and a transient analysis, to converge to a static equilibrium condition of the flexible pads and journal. Conducting a modal coordinate transformation helped us avoid heavy computational issues arising from a mesh refinement in the three-dimensional finite element pad model. Moreover, we adopted the Hertzian contact model to predict the elastic deformation at the pivot location. With the aforementioned overall strategy, we predicted the performance changes owing to the elastic deformation of the pad under varying load conditions. From the results, we observed an increase in the preload due to the pad elastic deformation.
Abstract
This study aims to quantify the variation in the performance of a tilting pad journal bearing (TPJB) owing to the elastic deformation of its pad. To this end, we first defined a parameter, “elastic preload”, and predicted the changes in the performance of the TPJB, as a function of the preload amount. We used the iso-viscosity Reynolds equation, which ignores the temperature rise due to viscous shear in thin films, and the resultant thermal deformation of the bearing structure. We employed a three-dimensional finite element model to predict the elastic deformation of the bearing pad, and a transient analysis, to converge to a static equilibrium condition of the flexible pads and journal. Conducting a modal coordinate transformation helped us avoid heavy computational issues arising from a mesh refinement in the three-dimensional finite element pad model. Moreover, we adopted the Hertzian contact model to predict the elastic deformation at the pivot location. With the aforementioned overall strategy, we predicted the performance changes owing to the elastic deformation of the pad under varying load conditions. From the results, we observed an increase in the preload due to the pad elastic deformation.
참고문헌 (11)
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- Suh, J., "Three-Dimensional Dynamic Model of TEHD Tilting-Pad Journal Bearing-Part I: Theoretical Modeling", ASME. J. Tribol., 137(4), pp.041703~ (2015)
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- 서준호, "열변형으로 인한 틸팅패드 저널베어링의 예압 변화", 한국트라이볼로지학회지, 32(1), pp.1~8 (2016), 한국트라이볼로지학회[DOI]
- Yang, J., "Three-Dimensional Thermo-Elasto-Hydrodynamic Computational Fluid Dynamics Model of a Tilting Pad Journal Bearing-Part I : Static Response", ASME. J. Tribol, 141(6), pp.061702~ (2019)
- Yang, J., "Three-Dimensional Thermo-Elasto-Hydrodynamic Computational Fluid Dynamics Model of a Tilting Pad Journal Bearing-Part II : Dynamic Response", ASME. J. Tribol, 141(6), pp.061703~ (2019)