Self-Excited Oscillations of a Circular Disk Rotating in Air

Abstract

Self-excited oscillations are often observed in a circular disk when it is rotated in air. Theoretical as well as experimental studies are conducted on these oscillations. As a preparatory study, free vibrations of the disk are discussed theoretically without taking into account the effect of air. Then, utilizing the results of this preparatory study, and taking into account the effect of air, free vibrations of the disk are studied. It is shown that self-excited oscillations can occur at a rotating speed higher than a certain value in the form of abackward traveling wave. Experiments confirm the theoretical analysis.