Tunable acoustic system

Details Tunable acoustic system Tunable acoustic system

G - Physics

10

K

G10K 11/02 (2006.01) F01N 1/06 (2006.01) G10K 11/00 (2006.01) G10K 11/16 (2006.01) G10K 11/178 (2006.01) F01N 1/02 (2006.01)

Patent

CA 2223589

An acoustic resonator (20) has a resonator cavity (22) with a resonator port (24) for communicating with an exhaust flow passage (26) conducting acoustic waves therethrough. Adjustable port structure varies acoustic impedance of the port by various combinations including translation to vary area along an arcuate surface, translation between discrete areas, translation to cumulatively open port area, multiple translation, multiple ports, rotational area change, and rotational length change. Adaptive control may be provided. A combined passive and active acoustic system may also be provided.

Résonateur acoustique (20) avec une cavité de résonance (22) et un port de résonateur (24) pour communiquer avec un passage de flux de sortie (26) acheminant les ondes acoustiques. La structure de port réglable fait varier l'impédance acoustique du port au moyen de différentes combinaisons, y compris la translation faisant varier l'aire d'une surface arquée, la translation entre des aires discrètes, la translation à une aire de port à ouverture cumulative, la translation multiple, les ports multiples, la modification de l'aire de rotation et la modification de la longueur de rotation. Une commande adaptative peut être fournie. Un système acoustique combiné passif et actif peut également être fourni.

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