Friction damping studies in multiple turbine blade systems by lumped mass methodAnalytical studies were conducted on multiple turbine blade systems using the lumped mass method. Each blade was idealized by a two mass-two spring model whose modal values were determined from the known frequencies corresponding to the first two bending modes and the frequency corresponding to the platform lockup condition. Two friction damping models were considered namely, the blade-to-blade and the blade-damper-blade. The equations of motion derived on the basis of these models were solved by a method of harmonic balance, assuming, in effect, that under cyclic excitation the blades will exhibit cyclic response at the same frequency. The solutions for 8 blade, 16 blade, and 4 blade systems were obtained using the computer program BLADE. The levels of damping produced by the two friction damping models were compared and evaluated. The optimal values of the friction force, for which the tip amplitude of the blades had a minimum value, were determined.
Document ID
19830061353
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Raju, B. B. (Dayton Univ. OH, United States)
Dominic, R. J. (Dayton Univ. OH, United States)
Held, T. W. (Dayton, University Dayton, OH, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Subject Category
Structural Mechanics
Meeting Information
Meeting: Annual Mini-Symposium on Aerospace Science and Technology