Abstract
Floating ring bearings are the commonly used type of bearing for automotive turbochargers. The automotive industry continuously investigates how to reduce the bearing friction losses and how to create silent turbochargers. Many of these studies involve creating a numerical model of the rotor-bearing system and performing validation on a test bench on which a turbocharger is driven by hot gases. This approach, however, involves many uncertainties which diminish the validity of the measurement results. In this study, we present a test setup in which these uncertainties are minimized. The measurement results show the behavior of the floating ring bearing as a function of oil feed pressure, oil feed temperature, rotor unbalance and bearing clearances. Next to an increased validity, the test setup provides measurement data with good repeatability and can therefore represent a case study which can be used for validation of rotor-bearing models.
Highlights
Floating ring bearings are used in turbochargers to support the rotor, which typically operates at speeds well over 100 krpm
All these effects can influence the dynamic behavior of the rotor-bearing system and render a validation of a floating ring bearing model with measurements obtained on a hot gas driven turbocharger disputable
In an attempt to minimize all aforementioned uncertainties in the experimental validation of the dynamics of a flexible high speed rotor supported by floating ring bearings, we have developed a test setup consisting of an externally driven Laval rotor
Summary
Floating ring bearings are used in turbochargers to support the rotor, which typically operates at speeds well over 100 krpm. When using a turbocharger for experimental validation of rotor-bearing models, the effect of the structural dynamics of the bearing supports is an uncertainty. Turbochargers contain oil seals, which add damping to the rotor [12] All these effects can influence the dynamic behavior of the rotor-bearing system and render a validation of a floating ring bearing model with measurements obtained on a hot gas driven turbocharger disputable. In an attempt to minimize all aforementioned uncertainties in the experimental validation of the dynamics of a flexible high speed rotor supported by floating ring bearings, we have developed a test setup consisting of an externally driven Laval rotor. The measurement results will focus on the synchronous and sub-synchronous rotor displacements as well as the bearing friction losses
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