Exhaust chamber comprising an envelope defining a gas circulation passage

Exhaust chamber comprising an external envelope delimiting a gas circulation passage and comprising at least one continuous wall, along which at least one cover piece is arranged, the cover piece or each cover piece only extending over a small, limited region of said continuous wall, characterised in that the dimensions of the cover piece and the connection between the cover piece and the continuous wall are such that, for at least one excitation frequency in the exhaust chamber between 200 Hz and 4 kHz, the cover piece and the continuous wall vibrate with a phase shift greater than 90°.

Use for reducing the sound emissions of an exhaust chamber comprising an external envelope delimiting a gas circulation passage, and comprising at least one continuous wall, at least one cover piece arranged along the continuous wall, the cover piece or each cover piece only extending over a small, limited region of said continuous wall, the dimensions of the cover piece and the connection between the cover piece and the continuous wall being such that, for at least one excitation frequency in the exhaust chamber between 200 Hz and 4 kHz, the cover piece and the continuous wall vibrate with a phase shift greater than 90°.