ASA 125th Meeting Ottawa 1993 May

3pSA8. Active noise control simulations in a parallelepipedic cavity.

Serge Brunet

Alain Berry

Jean Nicolas

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

Over the last few years, much attention has been focused on the development of active noise control. This development has been spurred by the available low-cost computing power, improvements in actuator technology, and the development of effective control algorithms. Many applications exist for the control of a noise field within complex enclosures such as aircraft, helicopter, and automobile cabins. In order to understand the basic underlying working principles, an analytical model based on a modal approach was developed to simulate the acoustic response of a parallelepipedic cavity (consisting of a flexible simply supported plane structure mounted on a rigid cavity) resulting from the application of acoustic or mechanical excitations on the flexible plane structure. The controllability of the noise field was then investigated with the use of acoustic point sources within the cavity as secondary noise sources and piezoelectric devices on the flexible plane structure as counter vibration sources. The presentation shall consist of a short summary of the analytical model development, results and comparisons for some of the tested control schemes.