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August 15, 2026The KSFM Journal of Fluid Machinery

Rotordynamic Performance Measurements and Model Predictions of Water-Lubricated Journal Bearings with Different Radial Clearances

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Authors

HCHyunwoo ChoKookmin UniversityYKYoungwoo KimKookmin UniversitySCSeokhun Choi

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Implication

Experimental validation demonstrates that smaller radial clearances increase damping and natural frequency in water-lubricated rotor systems, highlighting enhanced dynamic stability.

Key Points

  • To investigate the dynamic vibration response of rotor systems supported by water-lubricated journal bearings under different radial clearances and validate analytical model predictions.
  • Tested journal bearings with a diameter of 12 mm, length of 12 mm, and radial clearances of 35 μm and 70 μm on a custom rotordynamic test rig.
  • Operated rotor speeds from 0 rpm to 6,000 rpm with supplied lubricating water maintained at 20°C.
  • Measured vibration amplitudes and frequency components to compare against analytical rotordynamic predictions.
  • Increasing rotational speed and radial clearance reduced the damping ratio, escalating rotor instability.
  • A larger clearance of 70 μm degraded damping performance, elevating 1X vibration amplitudes near critical speeds and causing 0.5X subsynchronous whirl to dominate.
  • A smaller clearance of 35 μm enhanced direct stiffness and damping, raising the system's natural frequency and aligning well with predictive models.

Cite This Study

Cho et al. (2026) studied this question.

synapsesocial.com/papers/6a80199875c2e31742c8591chttps://doi.org/10.5293/kfma.2026.29.4.010
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