A Note on the Post-Flutter Dynamics of a Rotating Disk
Author:
Raman A.1, Hansen M. H.2, Mote, C. D.3
Affiliation:
1. School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288 2. Wind Energy Department Risø National Laboratory, DK-4000 Roskilde, Denmark 3. Glenn L. Martin Institute, University of Maryland, College Park, MD 20742
Abstract
The dynamic response of a thin, flexible disk spinning in an enclosed air-filled chamber, beyond the onset of aeroelastic flutter, is investigated experimentally. The results describe the occurrence of new nonlinear dynamic phenomena in the post-flutter regime. A primary instability leads to the Hopf bifurcation of the flat equilibrium to a finite amplitude backward traveling wave. A secondary instability causes this traveling wave to jump to a large-amplitude frequency locked, traveling wave vibration. For a small range of rotation speeds, both types of traveling wave motions co-exist. The results underscore the interplay between structural and fluidic nonlinearities in controlling the dynamic response of the fluttering disk in the post-flutter regime.
Publisher
ASME International
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Reference14 articles.
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, 1972, “Vibration in Thin Steel Discs,” Russ. Eng. J., 52, pp. 14–17. 4. Renshaw, A. A., D’Angelo, C., III, and Mote, C. D., Jr.,
1994, “Aerodynamically Excited Vibration of a Rotating Disk,” J. Sound Vib., 177(5), pp. 577–590. 5. Yasuda, K., Torii, T., and Shimuzu, T., 1992, “Self-Excited Oscillations of a Circular Disk Rotating in Air,” JSME Int. J., Ser. III, 35(3), pp. 347–352.
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