Sound absorbing panel

FIELD: construction, superstructures.

SUBSTANCE: principle applies to construction, partly to facilities meant for protection from sound waves (noise), and other wave emission and its absorption and can be used in noise protection screens. A noise absorbing panel consists of a perforated panel, hollow panel, sound absorbing element between the above mentioned panels. The perforated panel is made with openings in the form of fissure traps with reflectors turned in the direction of the sound absorbing element. The perforated panel contains, at least, two fissure traps, whose reflectors are inclined at different angles to the panel plane. The noise absorbing element has a thickness from 30 mm to 100 mm and placed in a polyethylene sheath of thickness 0.1 mm to 3 mm. The technical result consists of increasing the absorption capability of the panel.

EFFECT: increasing the absorption capability of a panel.

3 dwg

 

The technical field to which the invention relates.

The invention relates to the construction, in particular to a device intended for the protection of the sound waves (noise), as well as other waves of radiation and absorption, and can be used in screens sound.

The level of technology

Known noise absorbing panel, consisting of a body with a slit traps and elements of acoustic insulation located inside the body. The mechanism of sound absorption is the passage of sound and other waves through slot traps inside of the case, deformation of the element of sound attenuation due to exposure to waves and dispersion on the element of absorption of energy of sound and other waves. Such panels include panels, described in the patents of the Russian Federation No. 2266997, No. 2222662, No. 2176005 and other

Analogue of the invention is an Acoustic panel of a noise screen according to the patent of Russian Federation №2173372 from 10.09.2001,, comprising a housing formed of a rectangular frame, rear and front walls and built in Cabinet sound-absorbing plates. This construction has the disadvantage associated with the fact that there is no interference of sound waves and other waves of radiation inside sound-absorbing material due to the fact that the waves inside the sound-absorbing material moving parallel to each other.

The closest analogue (protot the SIP) to the claimed invention is a sound absorption panel, described in the patent of the Russian Federation No. 2155252 "Sound screen" from 27.08.2000, the Prototype is made in the form of a parallelepiped and includes a perforated panel, the panel is blank, the noise absorption element located between the perforated and blank panels that cover for connection of a perforated and hollow panels, and perforated panel is made with holes in the form of slot traps with reflectors rotated in the direction of the noise absorption element. The panels are made of U-shaped metal sheets. The panel provided in the upper and lower parts vibrationfree catches made in the form of caps with a trough-shaped cross-section, which is inserted with an interference fit into the cavity of each panel. The set of essential features, similar to the claimed invention, can be formulated as follows: sound absorption panel contains a perforated panel, the panel is blank, the noise absorption element located between the perforated and blank panels that cover for connection of a perforated and hollow panels, and perforated panel is made with holes in the form of slot traps with reflectors rotated in the direction of the noise absorption element. The disadvantage of the prototype is that there is no interference of sound waves and other waves of radiation inside the element of sound attenuation in connection with the eat, the waves inside the element of sound attenuation are moving parallel to each other.

Disclosure of inventions

The objective of the invention is to increase the absorptive capacity of the panel.

This problem is solved due to the fact that the sound absorption panel contains a perforated panel, the panel is blank, the noise absorption element located between the perforated and blank panels that cover for connection of a perforated and hollow panels, and perforated panel is made with holes in the form of slot traps with reflectors rotated in the direction of the noise absorption element, wherein the perforated panel includes at least two slotted traps, in which the reflectors are located at different angles to the plane of the perforated panel, the element of sound attenuation carry a thickness of from 30 mm to 100 mm and placed in a polyethylene sheath thickness from 0.1 mm to 3 mm

From the closest analogue of the invention has the following characteristics:

"...the perforated panel includes at least two slotted traps, in which the reflectors are located at different angles to the plane of the perforated panel, the element of sound attenuation carry a thickness of from 30 mm to 100 mm and come in a plastic shell with a thickness from 0.1 mm to 3 mm.

In the implementation of the Britania will reach the next technical result: the intensification of the interference of sound waves and other waves of radiation inside the element of sound attenuation with the weakening of their amplitudes.

Through reflector, tilted at different angles to the surface of the perforated panel, sound waves and other waves of radiation passing through a perforation inside the panel shall be the element of sound attenuation at different angles, causing intense interference of sound waves and other waves of radiation inside the element of sound attenuation with the weakening of their amplitudes. Thus, the mechanism of sound absorption is not only the deformation of the element of absorption and dissipation of wave energy, but also in the mutual damping due to interference is rejected by the reflectors of the waves.

Panel sound absorption is performed so that the ratio of the total area of the perforations to the area of the wall panel is perforated size from 0.2 to 0.4 (experimentally confirmed that this range is optimal for solving the problem of absorption and ensure the strength of the panel). Wall panel deaf and wall panels are perforated to provide reflections from their surfaces of the sound waves and other waves of radiation and the direction of the radiation inside the noise absorption element.

Panel sound absorption is performed in such a way that the element of sound attenuation carry a thickness of from 30 mm to 100 mm is Experimentally confirmed that such an element thickness of absorption, is full of mineral wool or foam, provides the most effective damping at small dimensions. The noise absorption element is placed in a polyethylene sheath thickness from 0.1 mm to 3 mm Polyethylene shell is also involved in the process of absorption of wave radiation of small length and, in addition, protects the element of sound attenuation against water and contamination, such as dust.

Panel sound absorption is carried out so that the area of the wall panel is perforated amount of 100000 mm2to 1000000 mm2. This panel size is convenient to produce, transport, transfer and mounted in a shock-absorbing screens.

Brief description of drawings

Figure 1 shows the sound absorption panel. Figure 2 shows a scheme of the mechanism of absorption due to the interference of waves.

The implementation of the invention

The sound absorption panel (see figure 1) contains a perforated panel 1, panel blank 2, the noise absorption element 3 located between the perforated and blank panels, covers 4 and 5 for connecting the perforated and hollow panels, and perforated panel is made with holes in the form of slot traps with reflectors 6, 7, 8 and 9, is rotated into the housing in the direction of the noise absorption element 3. Perforated panel 1 includes two slotted traps, in which the reflectors 6 and 7 are located under different the angles 10 and 11 (see 2) to the plane of the perforated panel.

The perforated panel is made in a cross section (cross section a-a, figure 1) in the form of a U-shaped sheet containing wall 15 and the shelves 16 and 17. Wall shelves and perforated panel coupled at an angle of 75°-100°. The specific value of this angle in the manufacture of an experimental batch was 90°. The panel blind is also made in cross-section in the form of a U-shaped leaf (cross section a-a, figure 1), containing the wall 18 and the shelf 19 and 20. Wall and shelf panel deaf coupled at a right angle. Shelves wall panel perforated panel deaf are overlapping. The distance 21 between the walls of the perforated panel and panel deaf are made from 30 mm to 100 mm, a Specific value of this distance in the manufacture of an experimental batch was 51.8 mm Shelves perforated panel are the same or different lengths. In the manufacture of an experimental batch of the length of each shelf panel perforated done the same. Shelf panel deaf also performed the same or different lengths. In the manufacture of an experimental batch of the length of each shelf panel deaf executed the same.

The noise absorption element made of mineral wool URSA type M-15G THE 5763-002-00287-697-97, P-75 GOST 9573-96 with water-repellent coating in the form of a polyethylene shell. The thickness of the noise absorption element 3 f is 1-marked position 21. The thickness of the noise absorption element are made from 30 mm to 100 mm, a Specific value of this thickness in the manufacture of an experimental batch of panels amounted to 51.8 mm noise absorption Element can perform Styrofoam PSB-25 GOST 15588-86.

Panel sound absorption is performed so that the ratio of the total area of the perforations to the area of the wall of the perforated panel is equal to 0.29; noise absorption element perform layered thick 51.8 mm; the noise absorption element is placed in a polyethylene membrane with a thickness of 0.15 mm; square wall panel is perforated size from 486000 mm2.

Perforated panel 1 shown in figure 1, contains slotted traps, in which the reflectors 6 and 7 are transverse cross-sectional straightforward and are located at different angles to the surface 22 of the perforated panel, and the difference in the angles is equal to 30°. The experiments showed that the difference in the angles of the reflectors, it is expedient to choose from a range of values from 0.1° to 35°. Thus the angles of the reflectors to the surface of the perforated panel is selected from a range from 10° to 70°. In an experimental batch of the angles was 20° and 50°.

This panel design is used for absorption of radiation in the frequency range from 40 Hz to 1015Hz. Conducted e is speriment on shumopoglascheniyu with panels, in which the reflectors 6 and 7 are transverse cross-sectional rounded with a corner radius of 10 mm is preferable that the radius of the rounding was performed by size from 5 mm to 15 mm). Reflected from such a reflector waves diverge at different angles, which contributes to the interference of waves.

The sound absorption panel works as follows.

Panel oriented towards the radiation source so that radiation was incident on the perforated panel. Through reflector, tilted at different angles to the surface of the perforated panel, sound waves and other waves of radiation passing through a perforation inside the panel shall be the element of sound attenuation at different angles, causing intense interference of sound waves and other waves of radiation inside the element of sound attenuation with the attenuation of the amplitudes of the waves of radiation. Waves are directed into the element of the absorption, as shown in figure 2 (not across, but mostly along the element of sound attenuation). The amplitude of waves of different radiations are attenuated due to deformation of the noise absorption element and a polyethylene sheath. Thus, the mechanism of sound absorption in the inventive device consists in the deformation of the noise absorption element and a polyethylene sheath, the dissipation of wave energy, as well as in the mutual damping of the waves as a result is their interference is rejected by the reflectors of the waves.

Supply panel soundproofing in the upper and lower parts of the lids 4 and 5, made of polyethylene, allows to damp the acoustic vibration of the structure, caused by the action of the sound front, sound source, and thereby to eliminate the possibility of turning the panel soundproofing in the source of unwanted acoustic oscillations. With the elimination of acoustic vibrations increases the reliability of a noise screen (less mechanical stress on the screen), consisting of a sound-absorbing panels.

In addition, plastic cap 4 and 5, the locking perforated and blank panels play an important role damper, damping panel soundproofing, caused by wind load, and prevent their transmission to hours. This is especially important when installing screens on bridges and overpasses. If the panel is made of aluminum, cap also are a function of insulator panel from steel profile, thereby preventing electrochemical corrosion. Thus, we achieve additional corrosion resistance of the structure.

The number of slit traps (hole punching) is selected from a range from 100 to 250 pieces For practice in this invention perform slotted traps with different areas of gaps (areas of perforation holes). Square slots and respectively set and reflectors choose from a range of values from 500 mm 2up to 1000 mm2. For example, a small gap is chosen area of 700 mm2most of the gap is chosen area of 750 mm2. Thus, the task and the technical result of the invention.

The sound absorption panel that contains a perforated panel, the panel is blank, the noise absorption element located between the perforated and blank panels that cover for connection of a perforated and hollow panels, and perforated panel is made with holes in the form of slot traps with reflectors rotated in the direction of the noise absorption element, wherein the perforated panel includes at least two slotted traps, in which the reflectors are located at different angles to the plane of the perforated panel, the element of sound attenuation carry a thickness of from 30 to 100 mm and come in a plastic shell with a thickness of 0.1 to 3 mm.



 

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