RU2838U1 - ACOUSTIC PLATE "IMPULSE" - Google Patents

Abstract

1. An acoustic plate containing a smooth and perforated wall, between which is a sound-absorbing layer, characterized in that the sound-absorbing layer is made in the form of alternating regions of air gaps and sound-absorbing material, and the ratio of the volumes of air gaps and sound-absorbing material lies in the optimal range of values V: V = 1 - 2: 3 - 4, where V is the volume of air gaps; V is the volume of sound-absorbing material. 2. A stove according to claim 1, characterized in that the sound-absorbing material is made in the form of a continuous figure or consisting of individual circuit elements.

Description

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ACOUSTIC PLATE IMPULSE

The utility model relates to industrial acoustics, in particular to broadband sound attenuation, and can be used in all sectors of the national economy when sound attenuating production equipment by sound absorption.

A well-known acoustic screen containing a perforated wall and a sound-absorbing layer (see the book by V. Ssfonovsky. Labor protection in the textile industry. M.: Legprombytizddd87, p. 56, Fig. 12).

The disadvantage of the known technical solution is the relatively insignificant coefficient of sound absorption.

The closest technical solution to the technical nature and the achieved result is an acoustic plate according to a. from. USSR N 348755, class P 01 N 1 / 04.1970. E13, containing a perforated wall and a sound-absorbing layer, in which pyramidal cells with vertices are made on the side of the wall (Fused into the layer.

The disadvantage of the technical solution, introduced as a prototype, is the relatively low noise attenuation efficiency due to the relatively low sound absorption coefficient.

The objective of the utility model is to increase the sound attenuation efficiency by increasing the sound absorption coefficient by increasing the sound absorption surfaces while maintaining the overall dimensions.

This is achieved by the fact that in an acoustic plate containing a smooth and perforated wall, between which is a sound-absorbing layer, the sound-absorbing layer is made in the form of alternating regions of air gaps and sound-absorbing material, moreover, X.

the volume of air gaps and sound absorbing material lies in the optimal range of values:

U.v.p .: Uzpm (1-2) :( 3-4),

where Uv.pr.- the volume of airflowers

Uzpm - the volume of sound-absorbing material,

and the sound-absorbing material is made in the form of a figured uninterrupted or co-existing from individual elements of the contours.

In Fig. 1, an aquatic plate is shown in a section, in Fig. 2, Fig. 7 embodiments of cells in the form of bodies of revolution and male figures based on bodies of revolution about additional surfaces. Fig. 8 is a figure. 12 shows variants of an acoustic plate with alternating regions of air pressure and sound-absorbing material, as well as options for performing sound-absorbing material in the form of a continuous figure and individual circuit elements.

The Impulse acoustic plate contains a smooth 1 and perforated 2 walls, mb (the second layer is made of soundproofing layer made in alternating regions of the airscreens 4 and soundproofed material 3, and the ratio of the air gaps and the soundproofing material lies in the optimal range of values:

Uv.pr .: Uzpm "(1-2) :( 3-4).

From the side of the perforated wall 2, the air gaps are made in the form of cells 4 (see Fig. 1) with vertices facing inward of the sound-absorbing layer. Cells 4 can be formed by complex shapes, for example, conical 5 and spherical b, as shown in FIG. 5 or 6, where on the conical surface 7, as on the base, additional surfaces 8 are made in the form of hemispheres, cones, and the like. moreover, their location on the base surface burns alternating as in me / g / l cffci

ridial and equatorial sections.

The acoustic pin can be made so that the sound-absorbing material 3 is located in the form of a continuous figure 8 or consisting of individual elements of the EDOD circuits (see Fig. 8 of Fig. 12). The air gaps 4 serve as resonant cavities, since they are formed by a smooth wall 1 and a perforated 2, the openings of which serve as the neck of Helmholtz resonators. Soundproofing material 3 is covered with a protective material, for example, fiberglass. Soundproofing material can be profiled on both sides, and soundproofing material is formed by a rotating body, for example, a sphere, cone, cylinder. Figured soundproofing material can be located in one or more layers, as shown in Fig.8 - Fig. 12, while the curly continuous layers of sound-absorbing material can be interconnected with the formation of additional resonant cavities 12. The figured sound-absorbing layer 11 can be placed between sheets 9 and 10 made of a sound-absorbing layer.

The acoustic screen works as follows.

Sound anergy, passing through the perforated wall 2, falls on the walls of cells 4 made in sound-absorbing layer 3 (which can be either soft, for example, basalt or glass fiber, or hard, for example, acigran type, etc.), the total absorption of sound absorption curtains is several times larger than wall area 2. The transition of sound energy into thermal energy (dissipation, energy dissipation) occurs in the pores of a sound absorber, which are a model of Telmgola resonators, where energy losses occur due to oscillating friction with the frequency of excitation of the mass of air located in the cavity of the resonator against the walls of the neck itself, having

airborne branch network of the pore of a sound absorber.

To prevent the eruption of a soft absorber, a fiberglass fabric, for example, type EV-1Sh, is located between the sound absorption and perforated stitch 2 (not shown).

The acoustic unit proposed by the authors is an effective medium for combating industrial noise, moreover, it is easy to maintain and manufacture, and the beautiful ornament of the cells creates the effect of psychological unloading.

Claims (2)

1. An acoustic plate containing a smooth and perforated wall between which there is a sound-absorbing layer, characterized in that the sound-absorbing layer is made in the form of alternating regions of air gaps and sound-absorbing material, and the ratio of the volumes of air gaps and sound-absorbing material lies in the optimal range of values
V _{century pr} .: V _ZPM = 1 - 2: 3 - 4,
where v _{c. etc.} - the volume of air gaps;
V _ZPM - the volume of sound-absorbing material. 2. The stove according to claim 1, characterized in that the sound-absorbing material is made in the form of a continuous figure or consisting of individual circuit elements.