Sound absorptive structural block with sequenced cavities

Details Sound absorptive structural block with sequenced cavities Sound absorptive structural block with sequenced cavities

1983-10-12

1986-01-07

Adams, Russell E.

Acoustics

Sound-modifying means

Sound absorbing panels

181286, 181288, E04B 100, E04B 552

Patent

active

045629013

ABSTRACT:
A sound absorbing block of molded structural material has a sequence of internal cavities that communicate with a region containing the sound to be suppressed through a first elongated slot located in an exterior wall of the block. The internal cavities are defined by interior walls, at least one of which also contains an elongated, sound-communicating slot. Each slot and its associated cavity define an acoustical Helmholtz resonator that dissipates sound energy incident upon the slot with an absorption peak at a natural frequency f.sub.n. The value of f.sub.n for each resonator is inversely proportional the square root of the volume of the cavity. The internal cavities are arranged to cascade in order of decreasing stiffness beginning at the first slot. In one form, two sequences of cavities in a block use a common final cavity. Also, the exterior slots can be formed in more than one wall to absorb sound produced in multiple regions.

REFERENCES:
patent: 2281121 (1942-04-01), Straight
patent: 2933146 (1960-04-01), Zaldastani et al.
patent: 3506089 (1970-04-01), Junger
patent: 3837426 (1974-09-01), Kleinschmidt
patent: 3866001 (1975-02-01), Kleinschmidt et al.
Handbook for Industrial Noise Control Prepared by Bionetics Corp. for NASA Technology Transfer Division, Langley Research Center, Hampton, Va. (1981) on p. 48, figure 5.5.

Affiliated with

Also associated with

Rating

Sound absorptive structural block with sequenced cavities does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sound absorptive structural block with sequenced cavities, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sound absorptive structural block with sequenced cavities will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-107584