Predictions for run-up procedures of automotive turbochargers with full-floating ring bearings including thermal effects and different bearing setups

Vetter, Daniel; Hagemann, Thomas; Schwarze, Hubert

doi:10.1533/978081000342.375

Cited by 3 publications

(4 citation statements)

References 16 publications

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“…The same characteristic of decreasing compressor ring speed is shown in [24]. A deeper rotordynamic analysis based on the measurements presented in this paper is given by Vetter [23].…”

Section: Figure 5 -Measurement Results Of Operating Points (A) Ring supporting

confidence: 62%

“…The subsynchronous 3 corresponding to ≈50% of the ring speed denoting instability of the outer FRB oil film. For the high amplitudes in the shaft speed range from 100 to 190 krpm, subsynchronous 3 increases (c) leading to higher eccentricities of the ring and thus to a decreasing ring speed [23,20]. The same characteristic of decreasing compressor ring speed is shown in [24].…”

Section: Figure 5 -Measurement Results Of Operating Points (A) Ring mentioning

confidence: 88%

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Thermal analysis of small high-speed floating-ring journal bearings

Porzig

Raetz

Schwarze

et al. 2014

11th International Conference on Turbochargers and Turbocharging

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“…The same characteristic of decreasing compressor ring speed is shown in [24]. A deeper rotordynamic analysis based on the measurements presented in this paper is given by Vetter [23].…”

Section: Figure 5 -Measurement Results Of Operating Points (A) Ring supporting

confidence: 62%

Section: Figure 5 -Measurement Results Of Operating Points (A) Ring mentioning

confidence: 88%

Thermal analysis of small high-speed floating-ring journal bearings

Porzig

Raetz

Schwarze

et al. 2014

11th International Conference on Turbochargers and Turbocharging

Self Cite

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“…[1][2][3][4][5][6][7][8][9][10][11][12]), particularly because the complex interaction between the oil films and the rotor can lead to self-excited vibrations, resulting in excessive audible noise, wear and possibly even failure of the bearings [3]. Many recent studies on the dynamics of rotors supported by floating ring bearings have focused on automotive turbocharger applications, often with the goal to replace expensive experimental testing by numerical simulation tools [1,[4][5][6][7]. The numerical results of these studies are commonly validated by measurements conducted on a turbocharger driven by hot gases.…”

Section: Introductionmentioning

confidence: 99%

“…It is well-known that unbalance plays an important role in determining both the synchronous as well as the sub-synchronous response [6,8,13]. Furthermore, when using hot gas to drive the rotor, a considerable amount of heat is conducted from the turbine to the bearing system [10], which changes the oil viscosity and thus the bearing properties [5,9]. Moreover, the non-axisymmetric air pressure distribution around the compressor wheel and the turbine wheel can cause significant radial rotor loads [14].…”

Section: Introductionmentioning

confidence: 99%

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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Current Challenges and Frontiers for the EHD Simulation of Journal Bearings: a Review

Allmaier¹,

Offner²

2016

SAE Technical Paper Series

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Elastohydrodynamic (EHD)-simulation is a widely applied simulation technique that is used in a very diverse field of applications ranging from the study of vibroacoustics to the calculation of friction power losses in lubricated contacts. In particular, but not limited to, the automotive industry, technical advances and new requirements put current EHD simulation methodology under test. Ongoing trends like downsizing, downspeeding, start-stop and the continuing demand for increasing fuel efficiency impose new demands and challenges also on the simulation methodology. Increasing computational capabilities enable new simulation opportunities on the other hand.In the following, an overview is given on the current state of the art and today's challenges for the elastohydrodynamic simulation of journal bearings and their wide range of applications from highly loaded main bearings supporting the crank shaft in the ICE to high speed turbocharger bearings.The topics addressed in this work span a wide range from mixed lubrication, low viscosity lubricants, polymer coatings, microstructured surfaces to the simulation of the thermal behavior and the simulation of hydraulically coupled journal bearings as they are commonly present in internal combustion engines.

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Predictions for run-up procedures of automotive turbochargers with full-floating ring bearings including thermal effects and different bearing setups

Cited by 3 publications

References 16 publications

Thermal analysis of small high-speed floating-ring journal bearings

Thermal analysis of small high-speed floating-ring journal bearings

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

Current Challenges and Frontiers for the EHD Simulation of Journal Bearings: a Review

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