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Dynamic Instability of a Flexible Disk Rotating in a Confined Fluid
Hara, Fumio,Watanabe, Masahiro 대한기계학회 1996 International Sessions in Celebration of the 50th Vol.1 No.1
This paper first deals experimentally with the characteristics of the unstarble vibration induced in a. single rotating flexible disk confined in a water-filled narrow space and visualization of the unstable vibration mode shapes. The experiment is carried out to investigated the relationships among the disk's vibrational displacement magnitude, unstady fluid pressure acting on both sides of the disk and mode shapes. Secondarily we develop a theoretical vibration model of a rotating flexible disk coupled with a swirling fluid flow in water-filled narrow spare and evaluate the influence of important parameters on the instability characteristics of the disk vibrations. The theoretical results show a good agreement to the experiment with respect to the vibration mode shapes, dependence of the instarbility frequency on the rotating speed but a dual native agreement for the critical speed at which the dish's unstable vibration undertakes.