• The KSFM Journal of Fluid Machinery
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• v.17 no.2
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• pp.73-76
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• 2014

• The KSFM Journal of Fluid Machinery
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• v.13 no.1
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• pp.69-73
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• 2010

• Aerospace Engineering and Technology
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• v.6 no.1
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• pp.201-208
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• 2007

A fuel pump and turbine rotordynamic design is performed for a 75 ton thrust liquid rocket engine. A distance from the rear bearing to the turbine was considered as a design parameter for load distribution of the bearings. Asynchronous eigenvalue analysis was performed as a function of rotating speeds, turbine mass and bearing stiffness to investigate critical speed of the fuel pump and turbine. From the numerical analysis, it is found that the effect of the front bearing stiffness is negligible in the critical speed due to the large mass moment of inertia of the turbine. With the rear bearing stiffness over $2{\times}10^{8}N/m$ and the turbine mass below 20 kg, the critical speed of the fuel pump and turbine in long shaft case is at least 70 % higher than the operating speed 11,000 rpm.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2009.10a
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• pp.83-84
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• 2009

• The KSFM Journal of Fluid Machinery
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• v.19 no.2
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• pp.67-70
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• 2016

• The KSFM Journal of Fluid Machinery
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• v.20 no.2
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• pp.93-97
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• 2017

• The KSFM Journal of Fluid Machinery
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• v.5 no.1 s.14
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• pp.95-98
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• 2002

• Journal of KSNVE
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• v.26 no.3
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• pp.25-29
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• 2016

• The KSFM Journal of Fluid Machinery
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• v.18 no.2
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• pp.89-93
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• 2015

• Tribology and Lubricants
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• v.34 no.1
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• pp.9-15
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• 2018

Modern high-performance automotive turbochargers (TCs) implement ceramic hybrid angular contact ball bearings in series with squeeze film dampers (SFDs) to enhance transient responses, thereby reducing the overall emission levels. The current study predicts the rotordynamic responses of the commercial automotive TCs (compressor wheel diameter = ~53 mm, turbine wheel diameter = ~43 mm, and shaft diameter at the bearing locations = ~7 mm) supported on ball bearings and SFDs for various design parameters of SFDs, including radial clearance, axial length, lubricant viscosity, and rotor imbalance conditions (i.e., amplitudes and phase angles) while increasing rotor speed up to 150 krpm. This study validates the predictive rotor finite element model against measurements of mass, polar and transverse moments of inertia, and free-free mode natural frequencies and mode shapes. A nonlinear rotordynamic model integrates nonlinear force coefficients of SFDs to calculate the transient responses of the TC rotor-bearing system. The predicted results show that SFD radial clearances, as well as phase angles of rotor imbalances, have the paramount effect on the dynamic responses of TC shaft motions.