ON THE TRANSLATING DAMPING CAUSED BY A THIN VISCOUS-FLUID LAYER BETWEEN A TRANSLATING STRING AND A TRANSLATING RIGID SURFACE

Authors
Citation
Fy. Huang et Cd. Mote, ON THE TRANSLATING DAMPING CAUSED BY A THIN VISCOUS-FLUID LAYER BETWEEN A TRANSLATING STRING AND A TRANSLATING RIGID SURFACE, Journal of sound and vibration, 181(2), 1995, pp. 251-260
Citations number
15
Categorie Soggetti
Acoustics
ISSN journal
0022460X
Volume
181
Issue
2
Year of publication
1995
Pages
251 - 260
Database
ISI
SICI code
0022-460X(1995)181:2<251:OTTDCB>2.0.ZU;2-V
Abstract
A vibrating, translating string is coupled to a translating rigid surf ace through a fluid film at the interface. The coupling is modelled as a translating, distributed damping and investigated through the waves propagating in the fluid-string coupled system. An approximate method , similar to the method of slowly varying parameters, gives explicit p redictions of the stability boundary in parameter space and of respons es of the possibly unstable modes near the stability boundary. The tra nslating damping destabilizes waves propagating in the direction of da mping propagation when the mean film speed relative to the string exce eds the wave speed in the string without fluid coupling. Through the s ame excitation mechanism, the maximum stable speed of a shell rotating on a stationary shaft is shown to be twice the critical rotation spee d of the shell in the absence of the fluid coupling.