Comparative performance of squeeze film air journal bearings made of aluminium and copper

Open Access


Two tubular squeeze film journal bearings, made from Al 2024 T3 and Cu C101, were excited by driving the single-layer piezoelectric actuators at a 75-V AC with a 75-V DC offset. The input excitation frequencies were coincident with the 13th modal frequency, at 16.32 and 12.18 kHz for the respective Al and Cu bearings, in order to produce a ‘triangular’ modal shape. The paper also provided a CFX model, used to solve the Reynolds equation and the equation of motion, to explain the squeeze film effect of an oscillating plate with pressure end leakage. The dynamic characteristics of both bearings were studied in ANSYS and then validated by experiments with respect to their squeeze film thickness and load-carrying capacity. It was observed that whilst both bearings did levitate a load when excited at mode 13, the Al bearing showed a better floating performance than Cu bearing. This is due to the fact that the Al bearing had a higher modal frequency and a greater amplitude response than the Cu bearing.


Single-layer piezoelectric actuator Squeeze film bearing Reynolds equation Pressure leakage Mode shape Al bearing and Cu bearing 


  1. 1.
    Stolarski TA, Chai W (2006) Load-carrying capacity generation in squeeze film action. Int J Mech Sci 48(3):736–741MATHCrossRefGoogle Scholar
  2. 2.
    Stolarski TA, Woolliscroft SP (2007) Performance of a self-lifting linear air contact. J Mech Eng Sci 221:1103–1115Google Scholar
  3. 3.
    Yoshimoto S, Anno Y, Sato Y, Hamanaka K (1995) Floating characteristics of squeeze-film gas bearing with elastic hinges for linear motion guide. Int J JSME 60(11):2109–2115Google Scholar
  4. 4.
    Yoshimoto S, Kobayashi H, Miyatake M (2006) Floating characteristics of a squeeze-film bearing for a linear motion guide using ultrasonic vibration. J Tribol Int 40(5):503–511Google Scholar
  5. 5.
    Ono Y, Yoshimoto S, Miyatake M (2009) Impulse-load dynamics of squeeze film gas bearings for a linear motion guide. J Tribol 131(10):1–6Google Scholar
  6. 6.
    Stolarski TA (2009) Numerical modelling and experimental verification of compressible squeeze film pressure. J Tribol Int 43(6):356–360Google Scholar
  7. 7.
    Wang C, Au YH (2011) Study of design parameters for squeeze film air journal bearing—excitation frequency and amplitude. J Mech Sci 2:147–155CrossRefGoogle Scholar
  8. 8.
    Guo ZL, Hirano T, Kirk RG (2005) Application of CFD analysis for rotating machinery—Part 1: Hydrodynamic, hydrostatic bearings and squeeze film damper. J Eng for Gas Turbines Power 127(10):445–451CrossRefGoogle Scholar
  9. 9.
    Wang C, Au YH (2012) Levitation characteristics of a squeeze-film air journal bearing at its normal modes. Int J Adv Manuf Technol 60:1–10CrossRefGoogle Scholar
  10. 10.
    Stolarski TA, Chai W (2006) Self-levitation sliding air contact. Int J Mech Sci 48(1):601–620MATHCrossRefGoogle Scholar

Copyright information

© The Author(s) 2012

Authors and Affiliations

  1. 1.Advanced Manufacturing and Enterprise Engineering, School of Engineering and DesignBrunel UniversityUxbridgeUK

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