Active acoustic attenuation mixing chamber

Details Active acoustic attenuation mixing chamber Active acoustic attenuation mixing chamber

1990-01-23

1991-09-03

Brown, Brian W.

Acoustics

Sound-modifying means

By wave interference

381 71, 60312, F01N 106

Patent

active

050444646

ABSTRACT:
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.

REFERENCES:
patent: 4487289 (1984-12-01), Kicinski et al.
patent: 4527282 (1985-07-01), Chaplin et al.
patent: 4665549 (1987-05-01), Eriksson et al.
patent: 4677676 (1987-06-01), Eriksson
patent: 4677677 (1987-06-01), Eriksson
patent: 4736431 (1988-04-01), Allie et al.
patent: 4815139 (1989-03-01), Eriksson et al.
patent: 4837834 (1989-06-01), Allie
"The Cancellation of Repetitive Noise and Vibration", Barrie Chaplin, Inter-Noise 80, Miami, Fla., Dec. 8-10, 1980.

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