A review on recent advancements in an automotive turbocharger rotor system supported on the ball bearings, oil film and oil-free bearings

Tammineni, Narisimha Murty; Mutra, Rajasekhara Reddy

doi:10.1007/s40430-023-04383-8

J Braz. Soc. Mech. Sci. Eng.

2023

DOI: 10.1007/s40430-023-04383-8

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A review on recent advancements in an automotive turbocharger rotor system supported on the ball bearings, oil film and oil-free bearings

Narisimha Murty Tammineni,

Rajasekhara Reddy Mutra

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Cited by 11 publications

References 140 publications

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Dynamics and stability analysis of unbalance responses in mid‐positioned electrically assisted turbocharger rotor

Hu,

Cao,

Cao

et al. 2024

Int Journal of Mech Sys Dyn

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Electrically assisted turbochargers (EAT) improve intake efficiency by motor‐assisted compressor impeller rotation, enhancing the system's transient response. However, the addition of motor rotor components has increased the number of unbalanced positions in the shaft system, leading to problems such as excessive compressor end vibration and complex changes in oil film stability. To evaluate the effects of unbalance in the motor rotor, along with the parameters of floating ring bearings (FRB), on the dynamic response of EAT, a finite element model of an EAT rotor supported by nonlinear FRB is developed, and the vibration response of the compressor end bearing is obtained by numerical integration. The results indicate: (1) In contrast to the effect of compressor and turbine unbalance, proper motor rotor unbalance is more effective in suppressing oil whirl instability in the high‐speed operating range. However, a new inner oil film whirl “instability interval” is also induced in the low‐speed operating range, leading to an increase in the Y1 compressor‐end amplitude at low and medium speeds, and this “instability interval” increases with the amount of unbalance. (2) When an oil whirl occurs in the oil film, the maximum eccentricity of the bearing surges and is greater than 0.3, which can be used as an effective threshold for determining whether the oil film is unstable in engineering applications. (3) A suitable outer oil‐film clearance range should be , otherwise, a wide range of outer oil‐film whirl instability occurs. Controlling the amount of unbalance and oil‐film clearance to suppress the sub‐synchronous vibration of the EAT, provides a theoretical basis for the design of the dynamics of the nonlinear rotor bearing system and improves the stability of the turbocharger's operation.

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Dynamics and stability analysis of unbalance responses in mid‐positioned electrically assisted turbocharger rotor

Hu,

Cao,

Cao

et al. 2024

Int Journal of Mech Sys Dyn

View full text Add to dashboard Cite

show abstract

Nonlinear dynamics characteristics of a tilting pad journal bearing supported turbocharger

Cao,

Guo,

Cheng

et al. 2024

Nonlinear Dyn

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Investigative studies on performance characteristics of aerodynamic foil thrust bearings with various foil configurations

Supreeth,

Raju,

Ravikumar

2024

J Braz. Soc. Mech. Sci. Eng.

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A review on recent advancements in an automotive turbocharger rotor system supported on the ball bearings, oil film and oil-free bearings

Cited by 11 publications

References 140 publications

Dynamics and stability analysis of unbalance responses in mid‐positioned electrically assisted turbocharger rotor

Dynamics and stability analysis of unbalance responses in mid‐positioned electrically assisted turbocharger rotor

Nonlinear dynamics characteristics of a tilting pad journal bearing supported turbocharger

Investigative studies on performance characteristics of aerodynamic foil thrust bearings with various foil configurations

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