Research Papers: Hydrodynamic Lubrication

Conditions of Lift-Off and Film Thickness in Squeeze Film Levitation

[+] Author and Article Information
Noël Brunetière

Institut Pprime,
CNRS, Université de Poitiers,
Ensma, Futuroscope,
Futuroscope F86962, France
e-mail: noel.brunetiere@univ-poitiers.fr

Antoinette Blouin

Institut Pprime,
CNRS, Université de Poitiers,
Ensma, Futuroscope,
Futuroscope F86962, France
e-mail: antoinette.blouin@univ-poitiers.fr

Guytri Kastane

Institut Pprime,
CNRS, Université de Poitiers,
Ensma, Futuroscope,
Futuroscope F86962, France
e-mail: liane.kastane.tchikaya@univ-poitiers.fr

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received October 9, 2017; final manuscript received December 10, 2017; published online January 29, 2018. Assoc. Editor: Min Zou.

J. Tribol 140(3), 031705 (Jan 29, 2018) (6 pages) Paper No: TRIB-17-1380; doi: 10.1115/1.4038805 History: Received October 09, 2017; Revised December 10, 2017

An experimental test rig has been used to analyze the lift-off condition of a squeeze film thrust bearing. It is composed of a vibrating flat plate linked to a piezo-actuator, a cylindrical mass, and two displacement sensors. The frequency and magnitude of oscillation are varied as well as the mass of the solid, to identify the lift-off conditions. The experimental results are compared to numerical simulations. The model solves the transient compressible Reynolds equation coupled with Newton's law for the levitated mass. The model is then used to extend the experimental results to other operating conditions. A dimensionless analysis of the results is performed to study the lift-off conditions and the average film thickness during levitation.

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Fig. 1

Configuration of the problem

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Fig. 2

Picture of the test rig

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Fig. 3

Example of experimental results

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Fig. 4

Example of numerical results, Λ = 1450, L = 0.00136, and A=90.5

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Fig. 5

Average levitation height versus the oscillation frequency for the small mass m = 9.8 g—Comparison of experiments with simulation results

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Fig. 6

Average levitation height versus the oscillation frequency for the big mass m = 18 g—Comparison of experiments with simulation results

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Fig. 7

Average levitation height versus the oscillation frequency—Numerical simulations up to high frequencies

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Fig. 8

Dimensionless average levitation height as a function of A/Λ—Numerical results

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Fig. 9

Dimensionless average levitation height as a function of A/Λ—Experimental results

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Fig. 10

Points at which lift-off occurs—Numerical results

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Fig. 11

Points at which lift-off occurs—Experimental results



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