RU28502U1 - Double-walled panel of modular type - Google Patents

Description

Double-walled panel of modular type.

The utility model relates to construction and can be used in the construction of public and industrial buildings with internal noise sources to improve acoustic comfort in the premises.

Known double-walled panel of a modular type, containing the front and rear walls. Between the plates, the space is filled with air. (I.I. Bogolepov. Industrial soundproofing, L. “Shipbuilding, 1986, p. 172). This panel improves the thermal insulation of rooms, but in terms of sound insulation it has practically no advantages over a single-wall panel.

Known double-walled panel of a modular type containing a perforated front wall and a continuous rear wall connected to it by partitions. (USSR author's certificate No. 1463884, IPC: E04 B 1/84, 1987).

This panel slightly reduces noise in some low-frequency region.

Known double-walled panel of a modular type, containing a front multilayer perforated wall and a continuous back wall connected to it by partitions with the formation of a resonant volume.

Layers of the front panel have the same non-coaxial microperforation in size, interconnected by elastic partitions. (USSR author's certificate No. 1617110, IPC: E04 B 1/84, publ. 1990, prototype).

The disadvantage of this panel is the change in sound absorption, but only for this single-entry element.

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To improve sound insulation and reduce noise in large areas, the use of tfototype is problematic.

The objective of the utility model is to reduce noise on unlimited areas of building structures in both industrial and residential premises.

This utility model eliminates the disadvantages of analogues and prototype.

The technical result of the utility model is to reduce noise in the low frequency range, improve sound insulation and sound attenuation on any given surfaces.

The technical result is achieved by the fact that in a double-walled panel of a modular type, it contains a perforated multilayer front wall and a continuous back wall connected to it by walls, the panel walls are made of wood fiber material, the perforation holes in the front multilayer perforated wall are coaxial, and the hole size in each layer perforation is different from the size of the perforation hole next to the underlying layer.

The size of the perforation hole of each subsequent wall layer is smaller than the size of the coaxial hole of the previous layer.

The size of each hole of the subsequent layer of the perforated wall is larger than the size of the coaxial hole of the previous layer.

At least one of the layers of the perforated wall is made of vibration-absorbing material.

The usefulness of the utility model is illustrated in figures 1,2,3,4.

Figure 1 presents in section a resonator module of the well-known double-walled sound-absorbing panel, where: 1-front

perforated wall, 2-hole perforation, 3 - partition, 4 - rear solid wall.

Figure 2 presents in section a module of a double-walled panel, where: 1-front perforated wall (layer), 2-hole perforation, 3 - partition, 4 - solid rear wall, 5 additional layer of the front wall, 6 - hole perforation in an additional layer .

In FIG. Figure 3 shows a sectional view of a module of a double-walled panel with a vibration-damping layer, where: 1-front perforated layer, 2-hole of perforation, 3 - partition, 4 - continuous back wall, 5 - additional layer, 6 - hole of perforation in an additional layer, 7 - additional layer of vibration-absorbing material VML-25, 8 - hole perforation of vibration-absorbing layer.

In FIG. 4 is a panel fragment illustrating coaxial holes and their sizes in successive layers, where: 1 front perforated layer, 2 perforation hole, 3 partition, 4 - continuous back wall, 5 - additional layer, 6 - perforation hole in the additional layer, 7 additional layer of vibration-absorbing material VML-25, 8 - hole perforation of the vibration-absorbing layer.

In FIG. 5 shows the frequency characteristics of a double-walled modular soundproof and soundproof panel:

G - frequency characteristics corresponding to the panel made in accordance with FIG. 1

2 - frequency characteristics corresponding to a double-walled panel made in accordance with figure 2.

3 - frequency characteristics corresponding to a double-walled panel made in accordance with FIG.

In all cases, walls 1, 4 and partitions 3 are made of wood-fiber material (fiberboard, MDF, hardboard), the rear solid wall 4 has a thickness of 7.5 mm, the perforated leads 1 and partitions 3 have a thickness of 3.5 mm, layers of vibration-absorbing material VMP -25 have a thickness of 3.5 mm.

The holes are 2,6,8 coaxial and have different sizes from layer 1 to layer 7. These dimensions can increase discretely or monotonously (then it will be a cone) from the outer layer to the inner layer or decrease.

Depending on this, sound absorbing or soundproofing functions may prevail in the panel. The modules are attached to each other and collect the protective surface of any given area.

Coaxial holes 2, 6,, 8 are a separate sound absorber, while the input acoustic resistance of the holes is equal to the acoustic resistance of the air.

Due to the fact that the internal cavities of the openings 2, 6, 8 in layers 1, 3, 7 have different volumes, the characteristic size of the internal cavity of a single sound absorber changes, for example, increases with distance from the inlet.

In rooms with high diffusivity of the sound field, characterized by a uniform energy density and a random direction of wave distribution at any point in space, it is most advisable to place sound absorbers on the ceiling of the room or at a small distance from it. Sound waves incident on the absorber at various angles are absorbed due to active losses due to internal friction in

sound-absorbing material of holes 2, 6, 8 (in the material of the layers); reactive losses of sound energy in the internal cavities of openings 2, 6, 8 of single absorbers.

The performance of room partitions from modular type double-walled panels glued with wallpaper or decorative materials improves both sound insulation and sound absorption.

The cavity formed by the front layer 1 (front perforated wall), partitions 3, and the solid back wall 4 represent a single resonant absorber. With a fixed value of the depth of this resonant absorber, a decrease in the resonant frequency is achieved by using perforated layers 1, 5, 7 installed close to each other.

The implementation of the multilayer front panel with coaxial perforation, but with different sizes of perforation holes, leads to an additional effect associated with an increase in the inertia of the system, which is also achieved due to the phenomena arising in the near sound fields of the holes and controlled by changing the percentage of perforation, layer thickness, hole diameter . Under the action of a sound wave, the front multilayer wall 1 and the partition 3, the solid wall 4 perform vibrations, the amplitude of which is determined by both the physicomechanical parameters of the perforated layers (mass, bending stiffness, friction between the layers) and acoustic parameters (attached masses of the perforation and slot holes holes along the contour of the walls and the elasticity of the air in the cavity of the resonator).

vibration-absorbing materials adds to the absorbing functions of the resonator the properties of soundproof and heat-insulating panels.

The incident sound wave on the front wall 1 of the panel excites transverse and longitudinal deformations in it, which lead to bending vibrations of this wall. Through the viscous layer 7 connecting the front wall 1 with the next layer 5, the longitudinal and transverse vibrations of the wall 1 are partially transmitted to this layer 7, causing bending vibrations in it, but of much smaller amplitude. These vibrations cause emission of a sound wave on the other side of layer 7. But the amplitude of this sound wave will be significantly less, and in the future, after passing through plate 5, even less.

Claims (4)

1. A double-walled panel of a modular type, comprising a front multilayer perforated wall and a continuous back wall connected to it by partitions, characterized in that the panel walls are made of wood-fiber material, the perforation holes in the front multilayer perforated wall are coaxial, and the hole size of each perforation layer is different from the size perforation holes next to the underlying layer. 2. The double-walled panel of a modular type according to claim 1, characterized in that the size of each hole of the subsequent layer of the perforated wall is smaller than the size of the coaxial hole of the previous layer. 3. The double-walled panel of a modular type according to claim 1, characterized in that the size of each hole of the subsequent layer of the perforated wall is larger than the size of the coaxial hole of the previous layer. 4. The double-walled panel of a modular type according to claim 1, or 2, or 3, characterized in that at least one of the layers of the perforated wall is made of vibration-absorbing material.