Active acoustic attenuation mixing chamber

Details Active acoustic attenuation mixing chamber Active acoustic attenuation mixing chamber

F - Mech Eng,Light,Heat,Weapons

01

N

172/28

F01N 1/06 (2006.01) F01N 13/14 (2010.01) F01N 1/00 (2006.01) F01N 1/08 (2006.01) F01N 1/14 (2006.01) F01N 1/22 (2006.01)

Patent

CA 2034654

Active acoustic attenuation apparatus is provided for cancellation of noise from an exhaust pipe (12). A chamber (50) has an input (70) receiving exhaust from the exhaust pipe and directing the exhaust along a flowpath (76) to a chamber output (74). Speakers (88, 90) are transversely spaced and offset from the flowpath and introduce sound into the chamber at a space (56) having a transverse area at least as large as each speaker, to minimize acoustic loading of the speakers and to protect the speakers from the heat of hot exhaust for automotive applications, including electronic mufflers.

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