Active sound attenuation system for engine exhaust systems...

Details Active sound attenuation system for engine exhaust systems... Active sound attenuation system for engine exhaust systems...

F - Mech Eng,Light,Heat,Weapons

01

N

181/10, 172/30

F01N 1/06 (2006.01) F01N 1/22 (2006.01) G10K 11/178 (2006.01)

Patent

CA 1329140

ABSTRACT OF THE DISCLOSURE An active sound attenuation system for combustion engine exhaust systems and the like is disclosed. To protect the counter-noise acoustic wave generator from the environment of the medium propagation the undesirable noise, an acoustically tuned anti-noise chamber is interposed between the wave generators and the location of the medium with the undesirable noise. To provide for global cancellation at the outlet end of the exhaust pipe, the anti-noise chamber has an annular opening disposed substantially in the plane of the exhaust pipe outlet thereby giving the undesirable noise and the cancelling noise an apparatus common source.

591506

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