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Abstract

Many automotive turbochargers operate in the self-excited unstable region. In the past these instabilities have been accepted as unavoidable, but recent developments in analysis and instrumentation may make it possible to reduce or eliminate them. A test stand being developed at Virginia Tech has been used to measure the vibrations of a 3.9 liter diesel engine stock turbocharger with floating bushing journal bearings. Vibration spectrum content clearly identifies the shaft instabilities and provides the basis for additional evaluation of future bearing design modifications. This paper provides additional experimental vibration data reduction that will be useful for future research direction to fully understand the turbocharger dynamic instability.

Keywords

Turbocharger experimental stability rotordynamics.

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References

Alsaeed, A.A. , 2005, "Dynamic Stability Evaluation of an Automotive Turbocharger Rotor-Bearing System," M.S. Thesis, Virginia Tech Libraries , Blacksburg, VA.

Andres, L. and Kerth, J. , 2004, "Thermal effects on the performance of floating ring bearings for turbochargers," Proceedings of the Institute of Mechanical Engineers Journal of Engineering Tribology 218(J), pp. 437-450.

Born, H.R. , 1987, "Analytical and experimental investigation of the stability of the rotor-bearing system of new small turbocharger," in Proceedings of the Gas Turbine Conference and Exhibition , Anaheim, CA, May 31-June 4.

Choudhury, P. , 2004, "Rotordynamic stability case Studies," Internatiomal Journal of Rotating Machinery 10(3), 203-211.

Ehrich, F.F. , 1999, Handbook of Rotordynamics, Krieger , Malabar, FL.

Gunter, E.J. and Chen, W.J. , 2000, DyRoBeS© - Dynamics of Rotor Bearing Systems User's Manual, RODYN Vibration Analysis, Inc., Charlottesville, VA.

Gunter, E.J. and Chen, W.J. , 2005, "Dynamic analysis of a turbocharger in floating bushing bearings," in Proceedings of the 3rd International Symposium on Stability Control of Rotating Machinery, Cleveland, OH, September 19-23.

Holmes, R. , Brennan, M.J. , and Gottrand, B. , 2004, "Vibration of an automotive turbocharger - a case study ," in Proceedings of the 8th International Conference on Vibrations in Rotating Machinery, Swansea , UK, September 7-9, pp. 445-450.

Kirk, R.G. , 1980, "Stability and damped critical speeds: how to calculate and interpret the results," Compressed Air and Gas Institute Technical Digest 12(2), 1-14.

10.

Kirk, R.G. , Alsaeed, A. , Liptrap, J. , Lindsey, C. , Sutherland, D. , Dillon, B. et al., 2008, "Experimental test results for vibration of a high speed diesel engine turbocharger," Tribology Transactions 51(4), 422-427.

11.

Li, C.H. and Rohde, S.M. , 1981, "On the steady state and dynamic performance characteristics of floating ring bearings," ASME Journal of Lubrication Technology 103, 389-397.

12.

Shaw, M.C. and Nussdorfer, T.J. , 1947, An Analysis of the Full-Floating Journal Bearing , Report No. 866, National Advisory Committee for Aeronautics (NACA).

13.

Swanson, E. , 2005, "Fixed-geometry, hydrodynamic bearing with enhanced stability characteristics," STLE Tribology Transactions 48(1), 82-92.

14.

Tanaka, M. , Hatakenaka, K. , and Suzuki, K. , 2002, "A theoretical analysis of floating bush journal bearing with axial oil film rupture being considered," ASME Journal of Tribology 124(3), 494-505.

15.

Ward, D.N. , Kierat, J.M. , Hau, R.D. , and Gray III, A.W. , 2004, "Turbo bearing lubrication system," US Patent 6,709,160.

16.

Watson, N. and Janota, M.S. , 1982, Turbocharging the Internal Combustion Engine, Wiley, New York.

Turbocharger On-engine Experimental Vibration Testing

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