Arrangement for active sound damping

Details Arrangement for active sound damping Arrangement for active sound damping

1994-12-02

1995-11-14

Dang, Khanh

Acoustics

Sound-modifying means

By wave interference

381 71, F01N 106

Patent

active

054668999

ABSTRACT:
It is known in the state of the art to dampen noise emissions by means of "anti-sound". In the gas exhaust installations of combustion machines, this is realized most often in that the exhaust gas flowing in the gas exhaust installation is charged with "anti-sound" produced by loudspeakers (12). However, such arrangements are disadvantageous in that the flow of hot exhaust gases reduces the service life of the loudspeakers, or that such measures are insufficient for actively damping the sound. The invention therefore presents an arrangement that avoids the disadvantages that exist in the state of the art. According to the invention, this is achieved in that the gas exhaust tube (10) ends in one of the two chambers of a double chamber box (17), and that a bass reflex tube (21) protrudes into this chamber of the double chamber box (17). The excellent sound cancellation at low loudspeaker output is achieved because the sound cancellation takes place in the chamber of box (17), where the ends of the bass reflex tube (21) and the gas exhaust tube (10) terminate, and that the radiation axis S intersects the center line M in space A between the two tubes (10, 21) or in tube (21), and the distance L between the dividing wall (18) and center line M is 75% of the largest diameter extension of loudspeaker 12.

REFERENCES:
patent: 5044464 (1991-09-01), Bremigan
patent: 5272286 (1993-12-01), Cain et al.
patent: 5336856 (1994-08-01), Krider et al.
Foller, Dieter: Antischall-Chancen und Corenzen Ih: ATZ Automobiltechnische Zeitschrift 94, 1992, 2, S. 93.

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