Nonlinear oscillations of automotive turbocharger turbines

Schweizer, Bernhard; Sievert, Mario

doi:10.1016/j.jsv.2008.10.013

Cited by 90 publications

(49 citation statements)

References 15 publications

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“…Contrary to the typical response of a turbocharger [19] that has two overhung disks instead of one center disk, no conical modes were observed during the measurements. Figure 5 shows the orbits of the shaft measured at the locations presented in Figure 3.…”

Section: Rotordynamic Response At Standard Operating Conditionscontrasting

confidence: 68%

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Rotordynamic and Friction Loss Measurements on a High Speed Laval Rotor Supported by Floating Ring Bearings

et al. 2017

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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.

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Section: Rotordynamic Response At Standard Operating Conditionscontrasting

confidence: 68%

“…Schweizer [19] also observed that an increase of pressure can delay the onset speed of oil whirl. We observed that the friction losses of the floating ring bearing increase with an increase of oil feed pressure, depicted in Figure 10.…”

Section: Displacement (Rms) [μM]mentioning

confidence: 96%

Rotordynamic and Friction Loss Measurements on a High Speed Laval Rotor Supported by Floating Ring Bearings

et al. 2017

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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

Lubricants

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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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“…Nevertheless, this approach does not allow determining the mode of stable motion of a rotor depending on inclusion of the rotor and both bearings into the whole system. Models of multi-mass rotors on two bearings with floating rings are employed by Li [1], Boyaci [2], Schweizer [3,4], San Andres [5], which allowed researching the mode of steady motion of rotors and its influence on the bearings load. Yet, this problem is not considered in the existing papers.…”

Section: Introductionmentioning

confidence: 99%

Dynamics Analysis of Flexible Rotor Supported by Floating Ring Bearings

Тараненко

Sliva

Zadorozhnaya

2015

Proceedings of the 9th IFToMM International Conference on Rotor Dynamics

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The asymmetric flexible rotor turbocharger supported by floating ring bearings is studied. We use the model of flexible asymmetric rotor and the nonlinear bearing forces have been calculated by using the numerical solution of the Reynolds equation for both fluid films. It is shown that at this rotor speed range the rotor performs direct nonsynchronous regular precession, which corresponds to the conical shape of the rotor motion. The rotor speed at which the shape of the rotor precession abruptly changes from conical to cylindrical has been revealed. It is established that the cylindrical shape of the precession corresponds to the unacceptable increase of bearing loads. Thus, the maximum rotational speed above which the turbocharger rotor under study shuts has been found. The implications can be applied to the turbocharger rotors supported by two bearings with floating ring bearings and console location of the compressor and turbine wheels.

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Nonlinear oscillations of automotive turbocharger turbines

Cited by 90 publications

References 15 publications

Rotordynamic and Friction Loss Measurements on a High Speed Laval Rotor Supported by Floating Ring Bearings

Rotordynamic and Friction Loss Measurements on a High Speed Laval Rotor Supported by Floating Ring Bearings

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

Dynamics Analysis of Flexible Rotor Supported by Floating Ring Bearings

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