INERTIAL- AND FLOW-INDUCED ACOUSTIC MODES COUPLING IN UNSTEADY-ROTATING CYLINDRICAL FLUID-FILLED CAVITIES

Autor: N. Tahani, D. Ecotiere, Michel Bruneau
Rok vydání: 2002
Předmět:
Zdroj: Journal of Sound and Vibration. 252:37-63
ISSN: 0022-460X
DOI: 10.1006/jsvi.2001.4025
Popis: A previous investigation has used a procedure for analyzing the transient behaviour of acoustic gyrometers, providing advances in “inertial–acoustic” theory and modelling. The approximate behaviour of the Coriolis acoustic modes coupling in a gyroscopic fluid-filled cylindrical cavity, for a very fast variation of the rotation rate of the cavity, has been derived, showing, after the stabilization of the rotation rate of the fluid, an asymptotic value of the sensitivity in good agreement with the theoretical steady state value and with the experimental result for steady rotation. However, the parameters which govern the transient response, its shape and its characteristic stabilization time, were not fully identified. Especially, the analysis does not predict recent experimental results, which show a stabilization time for the transient response of the gyro much shorter than the stabilization of the unsteady circular flow created when the walls of the cavity are set impulsively (Heaviside step function) in rotation. Thus, it is the aim of the present paper to investigate more deeply, analytically, the transient behaviour of the acoustic gyro, using a revisited description for the inertial–acoustic modes coupling which conveys significant improvements and introducing new features (as the flow-induced acoustic modes coupling) neglected in the previous investigation. The theoretical results are in good agreement with the experimental results now available; they also permit both to interpret the physical phenomena which underlie the “inertial–acoustic” transient process and to address requirements that have to be taken into account in the design of acoustic gyros.
Databáze: OpenAIRE
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