ASA 127th Meeting M.I.T. 1994 June 6-10

4pSAb10. Forced vibration and acoustic response of an unbaffled rotating disk.

Andre Cote

G.A.U.S., Dept. of Mech. Eng., Univ. de Sherbrooke, 2500 boul. Univ., Sherbrooke, PQ J1K 2R1, Canada

Noureddine Atalla

Univ. de Sherbrooke, Sherbrooke, PQ J1K 2R1, Canada

Jean-Louis Guyader

INSA-LYON, Lyon, Cedex 69621, France

The dynamic and acoustic response of an unbaffled rotating disk, subjected to a space-fixed harmonic lateral force, is investigated. The plate is supposed to be clamped at the inside and free at the outer boundary. Since the exciting force is space-fixed, the mass and stiffness matrices, obtained from the variational method with Rayleigh--Ritz in the plate-fixed frame, is converted back to the nonrotating frame, where the generalized force and the displacements of the plate are evaluated. The related acoustic pressure, neglecting fluid coupling, is determined using a boundary element formulation. Special attention has been given to assure correct modeling of the unbaffled condition on the radiation of the plate. Results are presented to show the effect of rotation for both dynamic response and acoustic radiation. [Work supported by the I.R.S.S.T. and by the N.S.E.R.C.]

All posters will be on display from 1:30 p.m. to 5:00 p.m. To allow contributors an opportunity to see other posters, contributors of odd-numbered posters will be at their posters from 1:30 p.m. to 3:15 p.m. and contributors of even-numbered posters will be at their posters from 3:15 p.m. to 5:00 p.m.