NDLI: Characterization of Turbine Blade Friction Dampers

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Koh, K. -H Griffin, J. H. Filippi, S. Akay, A.
Copyright Year	2004
Abstract	This paper discusses approach for characterizing the dynamic behavior of a friction damper. To accomplish this, the deflection of the damper is measured as a function of an applied force for a range of amplitudes, normal loads, and excitation frequencies. The resulting hysteresis curves are used to generate curves of nonlinear stiffness and damping as a function of the amplitude of motion. A method of presenting this information in a dimensionless format is demonstrated. This format allows direct comparisons of the nonlinear stiffness and damping of actual dampers with that often used in analytical models to compute the dynamic response of frictionally damped turbine blades. It is shown that for the case of a damper with a spherical head significant differences exist between the actual behavior of the damper and that often assumed in simple analytical models. In addition, Mindlin’s analysis of a sphere on a half space is used to estimate the damper’s stiffness as well as its theoretical hysteresis curves. The hysteresis curves are then used to determine dimensionless stiffness and damping curves. The results compare favorably with those found experimentally.
Sponsorship	International Gas Turbine Institute
Starting Page	237
Ending Page	245
Page Count	9
File Format	PDF
ISBN	0791841715
DOI	10.1115/GT2004-53278
e-ISBN	0791837394
Volume Number	Volume 6: Turbo Expo 2004
Conference Proceedings	ASME Turbo Expo 2004: Power for Land, Sea, and Air
Language	English
Publisher Date	2004-06-14
Publisher Place	Vienna, Austria
Access Restriction	Subscribed
Subject Keyword	Damping Dynamic response Turbine blades Dampers Friction Deflection Stiffness Excitation Stress
Content Type	Text
Resource Type	Article

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