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TECHNICAL PAPERS

On the Frictional Damping Characterization of Compliant Bump Foils

[+] Author and Article Information
Mohsen Salehi, Hooshang Heshmat, James F. Walton

Mohawk Innovative Technology, Inc. (MiTi ® ), 1037 Watervliet-Shaker Road, Albany, NY 12205URL:www.miti.cc

J. Tribol 125(4), 804-813 (Sep 25, 2003) (10 pages) doi:10.1115/1.1575774 History: Received August 29, 2002; Revised February 25, 2003; Online September 25, 2003
Copyright © 2003 by ASME
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References

Godet,  M., 1987, “Modeling of Friction and Wear Phenomena,” Tribology Series 15, Elsevier Science Pub.,pp. 12–35.
Heshmat,  1989, “The Effect of Dynamic Loads in Ribometers-Analysis and Experiments,” 16th Leeds-Lyon Symposium on Tribology, Tribology Series 17, Dowson, Taylor, Godet and Berthier, eds., Elsevier Science Pub.,pp. 465–473.
Ferri,  A. A., 1995, “Friction Damping and Isolation Systems,” ASME Trans., J. Sound Vibr., 117, pp. 196–206.
Akay, A., and Gellman, 1997, “Research Needs and Opportunities in the Area of Friction and System Dynamics-Part I,” Proc. of Workshop on the Interaction of Friction and System Dynamics.
Heshmat,  H., 1994, “Advancement in the Performance of Aerodynamic Foil Journal Bearings: High Speed and Load Capability,” ASME J. Tribol., 116(2), pp. 287–295.
Heshmat,  H., 2000, “Operation of Foil Bearing Beyond Bending Critical Mode,” ASME J. Tribol., 122, pp. 192–198.
Salehi, M., and Heshmat, H., 2000, “High Temperature Performance Evaluation of a Compliant Foil Seal,” AIAA Paper 2000-3376.
Ku,  C.-P. R., and Heshmat,  H., 1992, “Compliant Foil Bearing Structural Stiffness Analysis Part I: Theoretical Model Including Strip and Variable Bump Foil Geometry,” ASME J. Tribol., 113(2), pp. 364–369.
Ku,  C.-P. R., and Heshmat,  H., 1994, “Structural Stiffness and Coulomb Damping in Compliant Foil Journal Bearings: Theoretical Considerations,” STLE Tribol. Trans., 37(3), pp. 525–533.
Ku,  C.-P. R., and Heshmat,  H., 1994, “Structural Stiffness and Coulomb Damping in Compliant Foil Journal Bearings: Parametric Studies,” STLE Tribol. Trans., 37(1), pp. 255–262.
Salehi, M., and Heshmat, H., 2001, “Frictional Dampers Dynamic Characterization-Theory and Experiments,” presented at the 28th Leeds-Lyon Symposium on Tribology, Sept. 3rd–7th, Vienna, Austria.
Ku,  C.-P. R., and Heshmat,  H., 1993, “Compliant Foil Bearing Structural Stiffness Analysis Part II: Experimental Investigation,” ASME J. Tribol., 115(2), pp. 364–369.
Inman, D. J., 1995, Engineering Vibration, Prentice Hall.
Salehi, M., Heshmat, H., and Walton, J. F., 2001, “Compliant Foil Dampers for Gas Turbine Engines,” AFRL-PR-WP-TR-2001-2062, Final Technical Report, contract F33615-98-2809.

Figures

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Components of frictional energy
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Bump foil configuration
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The hysteretic and dry friction models
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Experimental test rig for shaker test
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Test section with components
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Hysteresis loops for tests at Xo=5.08 μm and Fn=135 N
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Hysteresis loops for test with f=1000 Hz and Fn=135 N
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Hystersis loop for test at f=1000 Hz and Xo=5.08 μm
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Variation of damping with frequency (Xo=5.08 μm and Fn=135 N)
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Variation of damping with amplitude of motion
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Variation of damping with static load
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Variation of dynamic coefficients, C* and μ* with frequency
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Gas turbine engine simulator layout and hardware
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Orbital track for the rotor in base condition (0.27 gr-mm imbalance level)
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Orbital track for rotor system at highly imbalanced condition

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