Effect of Flexible Damped Bearing-Supports on the Dynamic Stability of High-Speed Turbochargers

Alsaeed, Ali A.; Kirk, Gordon; Bashmal, Salem

doi:10.1115/imece2013-64539

Cited by 1 publication

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“…The combination of validated simulation models and state-of-the-art measurement techniques will lead to detailed insights into the rotordynamic characteristics of the investigated turbocharger model specifically, and the effect of non-circular bearing designs in general. Moreover, well-known results from the literature, such as distinct mode shapes of ring and shaft whirl (often referred to as conical vs. cylindrical motions, see, e.g., [3,20,23,[36][37][38][39]) will be studied based on measurement data.…”

Section: Discussionmentioning

confidence: 99%

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

Bernhauser¹,

Heinisch²,

Schörgenhumer

et al. 2017

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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.

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