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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

Figures

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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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