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Lubricants 2017, 5(1), 6; doi:10.3390/lubricants5010006

The Effect of Non-Circular Bearing Shapes in Hydrodynamic Journal Bearings on the Vibration Behavior of Turbocharger Structures

1
Diesel Engine Development, BMW Group, 4400 Steyr, Austria
2
Area Mechanics & Control, Linz Center of Mechatronics GmbH, 4040 Linz, Austria
*
Author to whom correspondence should be addressed.
Academic Editors: Ron A. J. van Ostayen and Daniel J. Rixen
Received: 27 January 2017 / Revised: 24 February 2017 / Accepted: 26 February 2017 / Published: 3 March 2017
(This article belongs to the Special Issue Bearings in Turbomachinery)
View Full-Text   |   Download PDF [8543 KB, uploaded 3 March 2017]   |  

Abstract

Increasing quality demands of combustion engines require, amongst others, improvements of the engine’s acoustics and all (sub)components mounted to the latter. A significant impact to the audible tonal noise spectrum results from the vibratory motions of fast-rotating turbocharger rotor systems in multiple hydrodynamic bearings such as floating bearing rings. Particularly, the study of self-excited non-linear vibrations of the rotor-bearing systems is crucial for the understanding, prevention or reduction of the noise and, consequently, for a sustainable engine acoustics development. This work presents an efficient modeling approach for the investigation, optimization, and design improvement of complex turbocharger rotors in hydrodynamic journal bearings, including floating bearing rings with circular and non-circular bearing geometries. The capability of tonal non-synchronous vibration prevention using non-circular bearing shapes is demonstrated with dynamic run-up simulations of the presented model. These findings and the performance of our model are compared and validated with results of a classical Laval/Jeffcott rotor-bearing model and a specific turbocharger model found in the literature. It is shown that the presented simulation method yields fast and accurate results and furthermore, that non-circular bearing shapes are an effective measure to reduce or even prevent self-excited tonal noise. View Full-Text
Keywords: engine acoustics; subsynchronous; turbocharger; constant tone; full-floating ring bearing; bearing ring; hydrodynamic; non-circular; hot-gas test rig; run-up simulation engine acoustics; subsynchronous; turbocharger; constant tone; full-floating ring bearing; bearing ring; hydrodynamic; non-circular; hot-gas test rig; run-up simulation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Bernhauser, L.; Heinisch, M.; Schörgenhumer, M.; Nader, M. The Effect of Non-Circular Bearing Shapes in Hydrodynamic Journal Bearings on the Vibration Behavior of Turbocharger Structures. Lubricants 2017, 5, 6.

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