Acoustics – Sound-modifying means – Sound absorbing fence or screen
Patent
1978-10-31
1981-01-13
Hix, L. T.
Acoustics
Sound-modifying means
Sound absorbing fence or screen
181286, 181288, 181292, B64F 126, G10K 1100
Patent
active
042444390
ABSTRACT:
A sound-absorbing structure comprising a plurality of linear and parallel grooves in the surface of the structure and ribs between the grooves. The structure is employed to damp, in a semi-space which is delimited by a substantially plane surface, e.g. a ground surface, a sound field propagating essentially in parallel with said surface. The sound field originates in for instance traffic on a motorway or an airport. The grooves of the structure are arranged in such manner, that a sound attenuation is obtained, in terms of the direction of propagation of the sound field, behind the structure by means of an acoustic coupling between adjoining grooves at the sound frequencies to be damped. The surface of the sound-absorbing structure is situated substantially in the surface delimiting the above mentioned semi-space. The cross-section of the structure has an outline similar to a square wave or a sine curve. The structure may include two or more groove systems each having the grooves spaced differently or each having varying groove-depths or both measures in combination, thus making it possible to damp a broader sound frequency range.
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Elektronikcentralen
Fuller Benjamin R.
Hix L. T,.
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