Rotordynamic Performance Measurements of An Oil-Free Turbocharger Supported on Gas Foil Bearings and Their Comparisons to Floating Ring Bearings

Lee, Yongbok; Park, Dong-Jin; Sim, Kyuho

doi:10.5293/ijfms.2015.8.1.023

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…The analysis was carried out for both fully floating ring and semi-floating ring bearings. Lee et al 10 illustrated the effect of gas foil bearings on dynamics of turbocharger rotor and compared the results of the rotor with floating ring bearings. Peng et al 11 suggested a material selection approach for turbocharger floating ring bearings.…”

Section: Introductionmentioning

confidence: 99%

Rotor vibration control studies with electrorheological fluid lubricant in floating ring bearings

Mutra

Srinivas

2019

Noise & Vibration Worldwide

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The high-speed rotors are usually supported on fluid-film bearings such as single film hydrodynamic bearings and floating ring type bearings to attain high damping capacity for minimizing the resonant vibration amplitudes. However, the bearing forces are highly nonlinear and are often prone to stability issues in the system. This work presents the use of an electrorheological fluid as a lubricant in floating ring bearings for rotor vibration control. The unbalance response of the rotor system is obtained from finite element approach by accounting gyroscopic effects and nonlinear bearing forces. By idealizing the electrorheological lubricant using Bingham model, the effective Reynolds equations for inner and outer films are formulated in terms of film pressures and thickness values. The coupled differential equations are solved numerically and the effect of external applied electric field on the dynamic response is studied in detail. A case study of automotive turbocharger rotor system is selected for illustration.

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Section: Introductionmentioning

confidence: 99%

Rotor vibration control studies with electrorheological fluid lubricant in floating ring bearings

Mutra

Srinivas

2019

Noise & Vibration Worldwide

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“…The test results revealed a stable TC rotor operating at a maximum speed of 121,500 r/min with low vibration amplitude and good shock tolerance. Since 2011, Lee et al [10][11][12] did many efforts to verify oil-free TCs. Among these studies, the rotordynamic characteristics were first analyzed, and then the oil-free TC rotors with diameters of 23.2 and 24 mm were operated and tested.…”

Section: Introductionmentioning

confidence: 99%

Feasibility study of a turbocharger rotor supported by air foil bearings with diameter of 17 mm focusing on rotordynamic performance

Yan

Liu

Zhang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper presents the feasibility study of an oil-free turbocharger with journal bearing diameter of 17 mm. Rotordynamic performance of a turbocharger rotor, supported by two identical bump-type foil journal bearings and a pair of foil thrust bearings, is predicted and tested. High-pressure cold nitrogen is adopted to drive the turbocharger rotor. In rotordynamic analysis, the critical speeds and logarithmic decrement of the turbocharger rotor are predicted by employing the finite element method, in which the stiffness and damping coefficients of foil journal bearings and aerodynamic cross-coupled stiffness of the turbine are taken into account. Compared with experimental results, the accuracy of the prediction for rotordynamic analysis is verified for 7.82% marginal error of the critical speed. During the experiment, three foil journal bearings with different nominal clearances are manufactured and tested. The maximum stable operating speed reaches 105,000 r/min for this 17-mm-diameter oil-free turbocharger rotor system. Test results indicate the nominal clearance has a negative influence on threshold speed of sub-synchronous motions. When the nominal clearance is relatively small, the foil journal bearing could not lift off due to a large starting torque, while sub-synchronous motions would emerge under a large nominal clearance because of the reduced stiffness and damping coefficients of foil journal bearings.

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An optimal parameter identification approach in foil bearing supported high-speed turbocharger rotor system

2021

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Rotordynamic Performance Measurements of An Oil-Free Turbocharger Supported on Gas Foil Bearings and Their Comparisons to Floating Ring Bearings

Cited by 5 publications

References 12 publications

Rotor vibration control studies with electrorheological fluid lubricant in floating ring bearings

Rotor vibration control studies with electrorheological fluid lubricant in floating ring bearings

Feasibility study of a turbocharger rotor supported by air foil bearings with diameter of 17 mm focusing on rotordynamic performance

An optimal parameter identification approach in foil bearing supported high-speed turbocharger rotor system

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