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http://dx.doi.org/10.5293/kfma.2017.20.2.053

Effects of Oil Inlet Pressure and Temperature on the Dynamic Behaviors of a Full-Floating Ring Bearing Supported Turbocharger Rotor  

Lee, In-Beom (Keyyang Precision Co., R&D center)
Hong, Seong-Ki (Keyyang Precision Co., R&D center)
Publication Information
The KSFM Journal of Fluid Machinery / v.20, no.2, 2017 , pp. 53-62 More about this Journal
Abstract
In this paper, the effect of oil conditions in rotor dynamic behaviors of a FFRB (Fully-Floating Ring Bearing) is investigated. Through the characteristic of a FFRB has two films, it has several advantages such as less friction loss and better stability over a wide speed range. However, it is difficult to supply a oil to the inner film. Thus, turbocharger makers have been paid significant attention to the lubrication of a FFRB because of its importance. This work focuses on the influence of oil inlet pressure and temperature. The methodologies of computational simulation and experimental test were used to estimate the rotor dynamic behaviors. In experimental test, the single-scroll turbocharger for the 1.4L diesel engine was used. The results show that the oil inlet pressure and temperature will place considerable influence on the rotor response. Oil conditions affect RSR (Ring Speed Ratio) which is cause of sub-synchronous vibrations, which also cause of oil whirling and whip even a critical speed. At higher speed range, the phenomenon of self-excited vibrations which is cause of instability of fluid whirl is investigated through the orbit shapes that consist of small orbit and large amplitude orbit. It is shown that some performance of a FFRB can be controlled by the conditions of oil supply. Finally, it was revealed that the oil induced operating conditions will strongly affect the turbocharger rotor dynamics behaviors.
Keywords
Turbocharger; Floating Ring Bearing; Journal Bearing; Tribology; Rotordynamics; Oil Film; Oil Whirling; Oil Whip;
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  • Reference
1 Genta, G. and Repaci, A., 1987, "Circular Whirling and Unbalance Response of Nonlinear Rotors," Rotating Machinery Dynamics, ASME DE-V. 2, Boston, Massachusetts, pp. 441-448.
2 Hori, Y., 1959, "A Theory of Oil whip," ASME J. of Appl. Mech., Vol. 81, pp. 189-199.
3 Rao, J. S., Raju, R. J., and Reddy, K. B. V., 1970, "Experimental investigation of oil whip of flexible rotors," Tribology., Vol. 3, No. 2, pp. 100-103.
4 Adams, M. L. and Guo, J. S., 1996, "Simulations and experiments of the non-linear hysteresis loop for rotorbearing instability," IMECHE conference Trans., Vol. 6, pp. 309-320.
5 Kim, T. H., Lee, Y. B., Kim, C. H., Kim, K. H., and Lee, N. S., 2002, "Rotordynamic Effects Due to Aerodynamic Instability in a Turbo-compressor with Air Foil Bearings," KFMA, Vol. 6, No. 2, pp. 62-69.
6 Lee, I. B. and Hong, S. K., 2014, "Effects of Oil Inlet Pressure and Temperature on the Dynamic Behaviors of a Full-Floating Ring Bearing Supported Turbocharger Rotor," Proceedings of 2014 KFMA, Vol. 2014, No. 11, pp. 317.
7 Kim, T. H. and Andres, L. S., 2009, "Thermohydrodynamic Model Predictions and Performance Measurements of Bump-Type Foil Bearing for Oil-Free Turboshaft Engines in Rotorcraft Propulsion Systems," J. Tribol, Vol. 132(1), 011701.
8 Rohde, S. M. and Ezzat, H. A., 1980, "Analysis of Dynamically Loaded Floating-Ring Bearings for Automotive Applications," ASME J. of Lub. Tech., Vol. 102, pp. 271-277.   DOI
9 Trippet, R. J. and Li, D. F., 1984, "High-Speed Floating-Ring Bearing Test and Analysis," ASLE Trans., Vol. 27, pp. 73-81.   DOI
10 Tsuruta, Y. and Tsuda, K., 1985, "Investigation into an Effect of Floating Bush Bearing, in Suppressing Oil-Whip at Higher Shaft Speed," JSLE, Vol. 30, pp. 838-845.
11 Shaw, M. C. and Nussdorfer, T. J., 1947, "An Analysis of the Full-Floating Journal Bearing," NACA report No. 866.
12 Tondl, A., 1966, "Some Problems of Rotor Dynamics," Chapman and Hall, London., pp. 155-160, 200-201.
13 Newkirk, B. L. and Taylor, H. D., 1925, "Shaft Whipping Due to Oil Action in Journal Bearings," Gen. Electric Rev., Vol. 28, No. 8, pp. 559-568.
14 Newkirk, B. L. and Grobel, L. P., 1934, "Oil-Film Whirl-A Non-Whirling Bearing," ASME Trans., Vol. 56, No. 8, pp. 607-615.
15 Hung, N. S., 2012, "Rotordynamics of Automotive Turbochargers," Springer, New York., pp. 204-208, 247-257.
16 Rieger, N. F., 1986, "Balancing of Rigid and Flexible Rotors," Shock and Vibration Information Center, U.S. Dept. of Depense.