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TECHNICAL PAPERS

Test Response and Nonlinear Analysis of a Turbocharger Supported on Floating Ring Bearings

[+] Author and Article Information
Chris Holt

Active Power, Inc., Austin, Texas 78758

Luis San Andrés

Mechanical Engineering Department, Turbomachinery Laboratory, Texas A&M University, College Station, Texas 77843

Sunil Sahay, Peter Tang, Gerry La Rue, Kostandin Gjika

Garrett Engine Boosting Systems, Honeywell International, Inc., Torrance, California 90505

J. Vib. Acoust 127(2), 107-115 (May 03, 2005) (9 pages) doi:10.1115/1.1857922 History: Received January 29, 2004; Revised March 26, 2004; Online May 03, 2005
Copyright © 2005 by ASME
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References

Orcutt,  F. K., and Ng,  C. W., 1968, “Steady-State and Dynamic Properties of the Floating Ring Journal Bearing,” ASME J. Lubr. Technol., pp. 243–253.
Tanaka,  M., and Hori,  Y., 1972, “Stability Characteristics of Floating Bush Bearings,” ASME J. Lubr. Technol., 94, pp. 248–259.
Hill,  H. C., 1958, “Slipper Bearings and Vibration Control in Small Gas Turbines,” Trans. ASME, 80, pp. 1756–1764.
Dworski,  J., 1964, “High-Speed Rotor Suspension Formed by Fully Floating Hydrodynamic Radial and Thrust Bearings,” ASME J. Eng. Power, 86, pp. 149–160.
Tondl, A., 1965, Some Problems of Rotordynamics, Chapman and Hall, London, pp. 155–160, 200–201.
Tatara,  A., 1970, “An Experimental Study of the Stabilizing Effect of Floating-Bush Journal Bearings,” Bull. JSME, 13, pp. 858–863.
Rohde,  S. M., and Ezzat,  H. A., 1980, “Analysis of Dynamically Loaded Floating-Ring Bearings for Automotive Applications,” ASME J. Lubr. Technol., 102, pp. 271–277.
Li, C. H., 1981, “Dynamics of Rotor Bearing Systems Supported by Floating Ring Bearings,” ASME Paper 81-LUB-37.
Li,  C. H., 1981, “On the Steady State and Dynamic Performance Characteristics of Floating Ring Bearings,” ASME J. Lubr. Technol., 103, pp. 389–397.
Trippett,  R. J., and Dennis,  F. L., 1983, “High-Speed Floating-Ring Bearing Test and Analysis,” ASLE Trans., 27, pp. 73–81.
Naranjo, J., Holt, C., and San Andrés, L., 2001, “Dynamic Response of a Rotor Supported in a Floating Ring Bearing,” Proceedings of the First International Conference in Rotordynamics of Machinery, ISCORMA1, Paper 2005, Lake Tahoe, NV.
Nelson,  H. D., 1980, “A Finite Rotating Shaft Element Using Timoshenko Beam Theory,” J. Mech. Des., 102, pp. 793–803.
XLTRC2 Rotordynamics Software Suite v. 2, 2002, Turbomachinery Laboratory, TAMU.
Nelson, H., and Meacham, W., 1981, “Transient Analysis of Rotor-Bearing System Using Component Mode Synthesis,” ASME Pap. No. 81-G7-10, Gas Turbine Conf., Houston, TX.
Nelson,  H., Meacham,  M., Fleming,  D., and Kasack,  F., 1983, “Nonlinear Analysis of Rotor-Bearing Systems Using Component Mode Synthesis,” J. Eng. Power, 105, pp. 606–614.
San Andrés, L., and Holt, C., 2001, “XLFRBTHERMAL Software Suite,” Proprietary Technical Report, Turbomachinery Laboratory, TAMU.
Piche,  R., 1995, “An L-Stable Method for Step-by-Step Time Integration in Structural Dynamics,” Comput. Methods Appl. Mech. Eng., 126, pp. 343–354.
Trippett, R. J., 1986, “Measured and Predicted Friction in Floating-Ring Bearings,” SAE Technical Paper Series, Paper No. 860075.
Kerth, J., 2003, “Experimental Rotordynamic Response of an Automotive Turbocharger With Floating Ring Bearings,” M.S. thesis, Texas A&M University, Mechanical Engineering Department.

Figures

Grahic Jump Location
TC casing acceleration (69 kPa inlet pressure, 29.4°C inlet temperature)
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TC casing acceleration (103.4 kPa inlet pressure, 29.4°C inlet temperature)
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TC casing acceleration (138 kPa inlet pressure, 29.4°C inlet temperature)
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TC casing acceleration (207 kPa inlet pressure, 29.4°C inlet temperature)
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Subsynchronous whirl ratios at 69 kPa inlet pressure
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Subsynchronous whirl ratios at 103.4 kPa inlet pressure
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Subsynchronous whirl ratios at 138 kPa inlet pressure
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Temperature averaged whirl frequency ratios (69–138 kPa inlet pressure)
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Temperature averaged synchronous acceleration (69–138 kPa inlet pressure)
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Temperature averaged subsynchronous “A” acceleration (69–138 kPa inlet pressure)
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Temperature averaged subsynchronous “B” acceleration (69–138 kPa inlet pressure)
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Finite element rotor model of turbocharger (compressor→turbine)
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Free–free rotor modes—test vs predictions
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Predicted ring speeds and RSRs (inlet conditions at 137.9 kPa and 32°C)
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Predicted (unstable) whirl frequency ratios (oil inlet at 137.9 kPa and 32°C)—linear analysis
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Measured whirl frequency ratios (137.9 kPa and 32°C)
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Waterfall of predicted rotor motion at turbine side FRB—no imbalance (137.9 kPa and 32°C). Nonlinear rotor-FRB model.
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Waterfall of predicted rotor motion at turbine side FRB—with imbalance (137.9 kPa and 32°C). Nonlinear rotor-FRB model.
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Predicted unstable whirl frequency ratios—null imbalance (137.9 kPa and 32°C). Nonlinear rotor-FRB model.
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Predicted unstable whirl frequency ratios—with imbalance (137.9 kPa and 32°C). Nonlinear rotor-FRB model.
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Predicted amplitude ratios vs fraction of rotor speed. Nonlinear rotor-FRB model—null imbalance.
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Predicted amplitude ratios vs fraction of rotor speed. Nonlinear rotor-FRB model—with imbalance.

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