Process for constructing a structural element that absorbs airbo

Details Process for constructing a structural element that absorbs airbo Process for constructing a structural element that absorbs airbo

1987-05-13

1988-07-05

Swisher, Nancy A. B.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428163, 428172, 244 1N, B32B 324, B32B 532

Patent

active

047554169

ABSTRACT:
The process makes it possible to determine for sound-absorbing structural elements made of a compact or foamed plastic with cup-shaped protuberances, the thickness and area size of the resonance surfaces that is required for an optimal sound aborption, as a function of the height of the protuberances and the endeavored resonance frequency.
The use of this process also makes it possible to adapt the frequency response curve of the sound absorption coefficient of the structural element to the frequency response curve of the sound level of a noise source.

REFERENCES:
patent: 2069413 (1937-02-01), Leadbetter
patent: 3026224 (1962-03-01), Rogers, Jr.
patent: 3050426 (1962-08-01), Stevens
patent: 3231454 (1966-01-01), Williams
patent: 4097633 (1978-06-01), Focht
patent: 4482592 (1984-11-01), Kramer
patent: 4531609 (1985-07-01), Wolf et al.
patent: 4555433 (1985-11-01), Jablonka et al.

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