Research Papers: Hydrodynamic Lubrication

Experimental Analysis of the Dynamic Characteristics of a Foil Thrust Bearing

[+] Author and Article Information
Franck Balducchi

Institut PPRIME,
UPR CNRS 3346,
Futuroscope Chasseneuil 86962, France
Hutchinson Stop-Choc Ltd.,
Banbury Avenue,
Slough SL1 4LR, UK
e-mail: fbalducchi@stop-choc.co.uk

Mihai Arghir

Fellow ASME
Institut PPRIME,
UPR CNRS 3346,
Université de Poitiers, ISAE ENSMA,
SP2MI, 11 Bd Pierre et Marie Curie, BP 30179,
Futuroscope Chasseneuil 86962, France
e-mail: mihai.arghir@univ-poitiers.fr

Romain Gauthier

Space Propulsion Division,
Forêt de Vernon - BP 802,
Vernon 27208, France
e-mail: romain.gauthier@snecma.fr

The (absolute) dynamic displacements of m1,2 are expressed from measured acceleration (accelerometers are bolted on m1 and m2).

This result can be also correlated with the reduced standard deviation depicted in Fig. 8 for frequencies close to 700 Hz.

Together with the dynamic modulus, the structural damping loss factor is normally used for describing energy dissipating in a viscoeleastic material. However, the loss factor can be also used for quantifying the energy dissipation due to dry friction [26].

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received August 19, 2014; final manuscript received January 19, 2015; published online February 11, 2015. Assoc. Editor: Bugra Ertas.

J. Tribol 137(2), 021703 (Apr 01, 2015) (9 pages) Paper No: TRIB-14-1206; doi: 10.1115/1.4029643 History: Received August 19, 2014; Revised January 19, 2015; Online February 11, 2015

This paper deals with the experimental analysis of the dynamic characteristics of a foil thrust bearing (FTB) designed according to specifications given by NASA scientists in 2009 (Dykas et al., 2009, “Design, Fabrication, and Performance of Foil Gas Thrust Bearings for Microturbomachinery Applications,” ASME J. Eng. Gas Turbines Power, 131(1), p. 012301). The present work details the new configuration of the same test rig that was used to test start-up characteristics of the aforementioned bearing (Balducchi et al., 2013, “Experimental Analysis of the Start-Up Torque of a Mildly Loaded Foil Thrust Bearing,” ASME J. Tribol., 135(3), p. 031703). The rig has been reconfigured to test dynamic characteristics. The dynamic characteristics of the bump foil structure were measured for static loads comprised between 30 N and 150 N while measurements for the FTB were performed at 35 krpm for 30 N, 60 N, and 90 N. Excitation frequencies were comprised between 150 Hz and 750 Hz. Results showed that the dynamic stiffness of the FTB increase with excitation frequency while the equivalent damping decreases. Both stiffness and damping increase with the static load but are smaller at 35 krpm compared to 0 rpm.

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Fig. 1

Front view and side view of the tested FTB

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Fig. 2

Dimensions of the tested FTB from Ref. [2]

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Fig. 3

Perspective and cross-sectional view of the test rig

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Fig. 4

The 2DOF dynamic model of the upper shaft

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Fig. 5

Results of the stiffness kc given by Eqs. (6) and (7)

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Fig. 6

Dynamic configuration of the test rig

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Fig. 7

Dynamic stiffness of the foil structure

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Fig. 8

Equivalent viscous damping of the foil structure

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Fig. 9

Calculated and measured magnitude (a) and phase (b) of the accelerances of the 2DOF system depicted in Fig. 6(a)

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Fig. 10

Loss factor of the foil structure

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Fig. 11

Stiffness of the FTB for different loads (30, 60, and 90 N) at 0 and 35 krpm

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Fig. 12

Equivalent viscous damping of the FTB for different loads (30, 60, and 90 N) at 0 rpm and 35 krpm

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Fig. 13

Polynomial approximation of equivalent viscous damping of the FTB for different loads (30, 60, and 90 N) at 0 rpm and 35 krpm

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Fig. 14

Systematic and random uncertainty of the measurement of dynamic stiffness of the FTB for 60 N load and 580 Hz rotation speed




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