On the Pneumatic Hammer of Hybrid Gas Bearings: Measurements and Predictions

Author:

Jung Hyunsung12,Sin Seki12,Kim Kyuman3,Heo Junwon12,Wee Minsoo12,Ryu Keun4

Affiliation:

1. Department of Mechanical Design Engineering, Hanyang University , Seoul 04763, Korea ; , Ansan, Gyeonggi-do 15588, Korea

2. Department of Mechanical Engineering, BK21 FOUR ERICA-ACE Center, Hanyang University , Seoul 04763, Korea ; , Ansan, Gyeonggi-do 15588, Korea

3. Department of Mechanical Design Engineering, Hanyang University , Seoul 04763, Korea

4. Department of Mechanical Engineering, Hanyang University , Ansan, Gyeonggi-do 15588, Korea

Abstract

Abstract Hybrid bearings integrating an external pressurizing source are widely used in high-speed turbomachinery due to their notable advantages, including low friction and wear, enhanced reliability and durability, and accurate rotor positioning, as well as large static stiffness and load carry capacity even lubricated with low viscosity liquids. This paper reports experimental data and predictions to identify the characteristics of pneumatic hammer of hybrid gas bearings, 60 mm in diameter, with increasing feed gas pressures. Pneumatic hammer characteristics with static load stiffnesses and flow rates of the test bearing are recorded for increasing static loads with various shaft center positions. A computational program for modeling of hybrid gas bearings predicts static load characteristics of the test bearings. Predictions show a remarkable agreement with measurements. Comparisons of measurements and predictions reveal that calculated reduced damping factors and damping coefficients of hybrid bearings, relying on volume ratio between recess and fluid film, are reliable indicators to estimate the onset condition of pneumatic hammer instability.

Funder

National Research Foundation of Korea

Publisher

ASME International

Subject

Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering

Reference22 articles.

1. On the Dynamic Behavior of Hybrid Journal Bearings;ASME J. Lubr. Technol.,1976

2. Hybrid Flexure Pivot-Tilting Pad Gas Bearings: Analysis and Experimental Validation;ASME J. Tribol.,2006

3. Turbulent-Flow Hydrostatic Bearings: Analysis and Experimental Results;Int. J. Mech. Sci.,1995

4. Investigation of Hydrostatic Bearings Operating in a Turbulent, Compressible Liquid,1996

5. Externally Pressurized Bearings as Servomechanisms. I-the Simple Thrust Bearing;ASME J. Lubr. Technol.,1967

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