Noise silencing systems
OwnerRobert E. Younginventor
Life of this patent
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Abstract
A silencer device having a substantially aperiodic (non-frequency-dependent) silencing action is provided. The silencer is of the flow type comprising an elongate chamber generally defining or surrounding an unobstructed fluid transmission path. The chamber is principally occupied by fluid having a predetermined characteristic impedance and is provided at both ends with acoustic energy absorbing means for providing acoustic impedance type terminations to said chamber, the acoustic impedance of the terminations being substantially equal to the characteristic impedance of the fluid in the chamber.
Claims18
A silencer device comprising an elongate chamber having two ends and generally defining a straight-line transmission path, said transmission path leading generally from one end of the chamber to the other, and being substantially uninterrupted by physical obstruction, the chamber being provided adjacent said ends with inlet and outlet apertures defining paths of entry to and exit from the chamber and communicating with the transmission path to provide a through-going transmission path, the chamber being principally occupied by a fluid having a predetermined characteristic impedance and being provided, at said ends, with acoustic energy absorbing means for providing energy dissipating acoustic impedance type terminations to said chamber, the acoustic impedance of the said terminations being substantially equal to the characteristic impedance of the fluid in the chamber.
A silencer device comprising a transmission pipe having an inlet end and an outlet end generally defining a through-going transmission path for fluid to be silenced, the transmission pipe being surrounded by an annulus comprising an elongate shunt chamber, the chamber and the transmission pipe being acoustically coupled by apertures in the transmission pipe, the chamber being principally occupied by a fluid having a predetermined characteristic impedance and being provided at both ends thereof with acoustic energy absorbing means for providing energy dissipating acoustic impedance type terminations to said chamber, the acoustic impedance of the terminations being substantially equal to the characteristic impedance of the fluid in the chamber.
Dependencies are inferred from the claim text.