Self-Excited Oscillations of a Circular Disk Rotating in Air.

Prediction of Aeroelastic Flutter in a Hard Disk Drive

“…The onset of aeroelastic #utter in disks spinning without enclosure (unbounded domains) has also been studied both analytically and experimentally. These include the works of D'Angelo and Mote [6], D'Angelo et al [7] and Yasuda and Torii [8]. D'Angelo and Mote [6] and D'Angelo et al [7] indicated that inviscid, compressible and incompressible potential #ow models signi"cantly overestimate the onset of the aeroelastic #utter speed.…”

“…D'Angelo and Mote [6] and D'Angelo et al [7] indicated that inviscid, compressible and incompressible potential #ow models signi"cantly overestimate the onset of the aeroelastic #utter speed. Yasuda and Torii [8] used an experiment-based #ow}structure interaction model where the model parameters were calculated from the experimental knowledge of the #utter speed only. The present work can be considered as a generalization of Yasuda and Torii's work and includes a careful measurement of the speed dependence of the model parameters at pre-#utter speed.…”

Nonlinear aeroelastic flutter phenomena of a flexible disk rotating in an unbounded fluid

“…It has been shown in prior work (Yasuda et al, 1992;Hansen et al, 2001) that for predicting the onset of the flutter instability, the aerodynamic pressure differential F ðr; y; tÞ can be represented as a rotating damping pressure that rotates in the same sense as the disk, albeit slower than it. Hence with respect to the ground-fixed frame, F ðr; y; tÞ can be represented by…”

Vibration Mode Analysis of a Rotating Circular Membrane under Transverse Distributed Load

“…Bulkeley (5) investigated stability of transverse motions of a spinning membrane using Nowinski's equation. Yasuda et al (6) studied vibrations of a circular disk rotating in air using the Galerkin method and performed corresponding experiment to show the occurrence of self-excited oscillation due to air. However, analyses and experiments dealing with extremely thin membranes and taking account of transverse distributed loads have seldom been conducted.…”