Alternative Performance Turbocharger Bearing Design

Keller, Robert A.; Scharrer, J. K.; Pelletti, Joseph M.

doi:10.4271/962500

Cited by 4 publications

References 1 publication

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Efficiency Analysis of Rapid Turbocharger With Alternative Bearing Design

Liazid

Izidi

Bencherif

2005

Journal of Mechanical Design

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This work presents the possibility to adapt self-acting air bearing to a rapid diesel engine turbocharger originally designed with oil journal bearings. The aim of this innovative idea is to estimate a global evolution of efficiency which is a parameter that strongly influences the inlet air mass of the diesel engine. This study deals with radial bearings and illustrates the advantages and the limits of the aerodynamic bearing application. First, the computing concerns the determination of the bearing load by resolving the Reynolds equation. So, the determination of the neat turbine power by a mathematical model using some experimental data is also made. Lastly, a comparison with the original hydrodynamic bearings is presented. Some discussions are also developed.

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Efficiency Analysis of Rapid Turbocharger With Alternative Bearing Design

Liazid

Izidi

Bencherif

2005

Journal of Mechanical Design

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Experimental and Analytical Investigation of High Speed Turbocharger Ball Bearings

Ashtekar

Sadeghi

2011

Journal of Engineering for Gas Turbines and Power

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The objectives of this investigation were to design and construct a high speed turbocharger test rig (TTR) to measure dynamics of angular contact ball bearing rotor system, and to develop a coupled dynamic model for the ball bearing rotor system to corroborate the experimental and analytical results. In order to achieve the objectives of the experimental aspect of this study, a test rig was designed and developed to operate at speeds up to 70,000 rpm. The rotating components (i.e., turbine wheels) of the TTR were made to be dynamically similar to the actual turbocharger. Froximity sensors were used to record the turbine wheel displacements while accelerometers were used to monitor the rotor vibrations. The TTR was used to examine the dynamic response of the turbocharger under normal and extreme operating conditions. To achieve the objectives of analytical investigation, a discrete element ball bearing model was coupled through a set of interface points with a component mode synthesis rotor model to simulate the dynamics of the turbocharger test rig. Displacements of the rotor from the analytical model were corroborated with experimental results. The analytical and expérimentât results are in good agreement. The bearing rotor system model was tised to examine the bearing component dynamics. Effects of preloading and imbalance were also found to have significant effects on turbocharger rotor and bearing dynamics.

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Experimental Investigation of the Dynamic Loads in a Ball Bearing Turbocharger

Conley

Sadeghi

Griffith

et al. 2019

Journal of Tribology

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The objectives of this investigation were to design and develop an experimental turbocharger test rig (TTR) to measure the shaft whirl of the rotating assembly and the axial and frictional loads experienced by the bearings. The TTR contains a ball bearing turbocharger (TC) that was instrumented and operated under various test conditions up to 55,000 rpm. In order to measure the thrust loads on the compressor and turbine sides, customized sensors were integrated into the TC housing. The anti-rotation (AR) pin that normally prevents the bearing cartridge from rotating was replaced with a custom-made load cell adapter system. This sensor was used to measure the frictional losses in the bearing cartridge without altering the operation of the TC. Proximity sensors (probes) were also installed in the compressor housing to monitor shaft whirl. Axial load results indicated that the compressor side bears most of the thrust load. As the backpressure or the speed of the TC was increased, the thrust load also increased. Frictional measurements from the AR pin sensor demonstrated low power losses in the ball bearing cartridge. For certain shaft speed ranges, the data from the sensors illustrated periodic trends in response to the subsynchronous whirl of the shaft.

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Alternative Performance Turbocharger Bearing Design

Cited by 4 publications

References 1 publication

Efficiency Analysis of Rapid Turbocharger With Alternative Bearing Design

Efficiency Analysis of Rapid Turbocharger With Alternative Bearing Design

Experimental and Analytical Investigation of High Speed Turbocharger Ball Bearings

Experimental Investigation of the Dynamic Loads in a Ball Bearing Turbocharger

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