Device for controlling a propagation direction of noise

Details Device for controlling a propagation direction of noise Device for controlling a propagation direction of noise

1976-05-14

1978-01-24

Spar, Robert J.

Railway rolling stock

Sound deadeners

104 1R, 104124, 181210, B61D 1700, B61K 1300

Patent

active

040697681

ABSTRACT:
A device for controlling a propagation direction of noise which is preferably associated with a sound insulating wall to significantly improve its sound reducing effect of alleviating noise emitted from a noise source such as a railroad, highway and the like on which an electric car and automobiles run. The device comprises a hollow structural body composed of a plurality of elongate hollow passages superimposed one upon the other and spaced apart from each other. The passages are arranged in a propagation direction of noise emitted from the noise source and serve to refract and lag in phase the noise passed therethrough, thereby producing a sound reducing region located intermediate between a direct propagation sound and the refraction propagation sound.

REFERENCES:
patent: 2726830 (1955-12-01), Brown et al.
patent: 3111191 (1963-11-01), Bachert
patent: 3177970 (1965-04-01), Boschi
patent: 3212453 (1965-10-01), Lich
patent: 3772993 (1973-11-01), Noble et al.
patent: 3812931 (1974-05-01), Hauskins, Jr.
patent: 3830335 (1974-08-01), Zorumski

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