Panel that absorbs acoustic energy at low, medium and high frequ

Details Panel that absorbs acoustic energy at low, medium and high frequ Panel that absorbs acoustic energy at low, medium and high frequ

1994-07-29

1996-02-20

Dang, Khanh

Acoustics

Sound-modifying means

Sound absorbing panels

181290, 181294, 4283166, E04B 182

Patent

active

054930812

ABSTRACT:
A panel absorbing acoustical energy at low, medium and high frequencies, particularly at frequencies ranging from 400 Hz to 5,000 Hz, is essentially constituted by a plate (1) of semi-rigid foam with open communicating cells and by a layer (2) of bonded fibers or by a flexible cellular material. The assembly acts according to a mass-spring principle. The plate (1) of semi-rigid foam with open communicating cells constitutes the mass of the assembly functioning according to the mass-spring principle, while the layer (2) of bonded fibers or of flexible cellular material constitutes the spring of this assembly. The foam comprising the plate (1) is preferably a semi-rigid polyurethane foam of a density ranging from 20 kg/m.sup.3 to 50 Kg/m.sup.3, of a thickness comprised between 5 mm and 15 mm and whose permeability to air is comprised between 5 liters per minute and 45 liters per minute for a specimen 80 mm in diameter. The layer (2) constituting the spring has a stiffness ranging from 0.007 MPa to 0.05 MPa and a thickness ranging from 4 mm to 10 mm.

REFERENCES:
patent: 4172918 (1979-10-01), Doerer
patent: 4283457 (1981-08-01), Kolsky et al.
patent: 4621013 (1986-11-01), Holtrop et al.
patent: 4695501 (1987-09-01), Robinson
patent: 5082716 (1992-01-01), Satterfield et al.
patent: 5258585 (1993-11-01), Juriga
patent: 5298694 (1994-03-01), Thompson et al.

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