Sound-absorbing elements of premises

FIELD: construction.

SUBSTANCE: in sound-absorbing elements of a premise, containing profiled and perforated walls, between which there is a layer of sound-absorbing material, besides, one of walls is arranged as smooth, and sound-absorbing material is arranged in two layers, one of which, more rigid one, is arranged as solid and profiled, and the other one, soft one, is arranged as interrupted and is located over surfaces of the first layer. Sound-absorbing elements of premises comprise frame, window, door openings, openings to locate lamps and acoustic barriers, arranged in the form of rigid and perforated walls, between which there is a sound-absorbing material arranged in two layers. One layer, a more rigid one, is arranged as solid and profiled, of complex profile, made of inclined faces, directed downwards and joined with horizontal faces, where resonant holes are provided, and the other one - soft one, is arranged as interrupted and is located under sound-reflecting surfaces of the first layer. Besides, solid profiled layer of sound-absorbing material is made of material, sound reflection coefficient of which is higher than coefficient of sound absorption.

EFFECT: increased efficiency of sound absorption.

3 dwg

 

The invention relates to acoustics, in particular to broadband samohlasen, and can be used in all sectors of national economy under the maximum sound attenuation functions of production equipment by the method of absorption.

The closest technical solution to the technical essence and the achieved result is shumopogloshchenija panel by A.S. USSR N348755, CL F01N 1/04, 1970 [1], comprising a perforated wall and an absorbent layer, in which the side walls are made of a pyramidal cell with vertices facing the inside of the layer.

The disadvantage of the prototype is relatively low effectiveness of sound attenuation due to partial reflection of sound waves from the absorber and relatively narrow (very high frequency) the range of noise control.

The technical result - increasing the efficiency of absorption by extending the frequency range and the secondary absorption of the sound waves reflected from the absorber.

This is achieved by the fact that the sound-absorbing elements of the room containing shaped and perforated walls, between which is placed a layer of sound absorbing material, and one of the walls is made smooth, and the sound-absorbing material is in two layers, one of which, more rigid, made a solid and profile is included, and the other, soft, made discontinuous and is located beneath the surface of the first layer, sound-absorbing elements of the premises contain a frame, window, door openings, openings for placement of lamps and acoustic enclosures are made in the form of a rigid and perforated walls, between which is located an absorbent material located in two layers, one of which, more rigid, made a solid and profiled, complex profile, consisting of inclined faces that are directed downward and connected to the horizontal edges, which are made of resonant holes, and the other, soft, made discontinuous and is located under the sound-reflecting surfaces of the first layer and solid profiled layer of sound-absorbing material made of a material whose coefficient of reflection of sound is greater than the coefficient of sound absorption.

Figure 1 shows a diagram of the premises, figure 2 - design sound absorbing acoustic fencing areas, figure 3 - element design of the absorber above the most noisy equipment.

Sound-absorbing elements of the premises contain the skeleton of a plant (not shown), window 2 and 8, the door 9 openings, the openings 5 for placing lamps and acoustic enclosures 1, 3, 4, 10, 12 (1). Acoustic enclosures (figure 2), done is installed in the form of a rigid 13 and perforated walls 14, between which is located an absorbent material located in two layers, one of which, more than 20 hard, made a solid and profiled, complex profile, consisting of inclined faces 15 and 17, directed downward and connected to the horizontal edges 18, which is made of resonant holes 19, and the other, a soft 16, made discontinuous and is located under the sound-reflecting surfaces of the first layer 20.

Solid profiled layer of sound-absorbing material 20 made of a material whose coefficient of reflection of sound is greater than the coefficient of sound absorption.

Items 6 and 7 of the absorber above the most noisy technological equipment 11 contain a frame 21 which is hooked over the hooks 22, for example, wires (not shown), or directly attached to a rigid wall or ceiling industrial premises. The frame 21 is covered with the outer side of the foil, preventing the deposition of dust. To the bottom 23 of the frame with the inner side of the fixed reactive resonance box 24, separated by partitions 25 and 27, with the holes 26 and 28 that performs the functions of the necks of Helmholtz resonators installed in this case series. The active part of the elements of material is a filled with sound-absorbing material 29 of the cavity between the frame of the meters 21 and the insert 24. Filling exercise absorbent non-flammable material (for example, Vinprom, fiberglass) with a protective layer 30 of glass, preventing the loss of absorbent material. The shape of the frame 21 and the insert 24 can be any (for example, round or polyhedral shape), and the frame 21 may be perforated to increase the surface absorption.

The equipment 11 is installed on the vibration-insulating supports (not shown), the window openings 2, 8 contain a vacuum insulating glass units, and as a sound-absorbing material acoustic fencing areas and elements of the heat sinks used ceramics with porosity in the range of optimal values: 30...45%, or element is used in the form of layer-by-layer and cross-winding of the porous yarn wound on acoustically transparent frame, for example the wire frame (not shown) or an item from a rigid porous sound-absorbing material, such as metalloboranes or stone, shell (drawing not shown).

Sound-absorbing elements are as follows. Sound waves propagating in the production area interact as follows. Sound energy from equipment 11 in the room, passing through perforirovannoi wall 14 of acoustic enclosures 1, 3, 4, 10, 12, gets on the layers of soft absorbent material 16 (e.g., made of basalt or glass fiber), which is made discontinuous and is located under the sound-reflecting surfaces of the first layer 20. The transfer of sound energy into heat (dissipation, the dissipation of energy occurs in the pores of the material, which represents a model of Helmholtz resonators, where energy losses occur due to friction oscillating with the frequency of excitation of the mass of air in the mouth cavity, the walls of the cap, having a form of an extensive network of pores of the material. The ratio of the perforation of the perforated wall is equal or greater than 0.25. To prevent rashes soft absorbers provided by the fiberglass, for example, type E3 effects-100, located between the absorber and the perforated wall.

Items 6 and 7 of the material with the reactive and the active elements are as follows. The absorption at low and medium frequencies is due to the acoustic effect based on the principle of Helmholtz resonators formed by the resonant cavities in the insert 24 with the openings of the resonators in the form of holes 26 and 28. Various amounts of the resonant cavities are used to suppress sound waves in the sound range frequent the t, typically, large amounts of noise reduction at low frequencies and small - in the region of medium and high frequencies.

The interaction of sound waves with active cavities filled with non-combustible absorbent 29 leads to samohlasen in the high frequency range, and by performing these cavities inclined increases the surface absorption and, consequently, increases the sound absorption coefficient. A resonant cavity can also be completely or partially filled with material depending on the desired frequency range of the noise.

An advantage of the invention is its versatility for different production areas, with a variety of noise characteristics. It should be noted the relative ease of tuning of an acoustic panel to the desired frequency range of the noise and its economical efficiency (meaning the reduction of noise to sanitary and hygienic norms). In addition, the coating of body parts foil prevents the deposition of dust on acoustic fencing and execution of non-combustible absorbent materials makes it fireproof.

The sound design elements of the room is an effective way is Orby with industrial noises.

Sound-absorbing elements of the room containing shaped and perforated walls, between which is placed a layer of sound absorbing material, and one of the walls is made smooth, and the sound-absorbing material is in two layers, one of which, more rigid, made a solid and profiled, and the other, soft, made discontinuous and is located beneath the surface of the first layer, with sound-absorbing elements of the premises contain a frame, window, door openings, openings for placement of lamps and acoustic enclosures are made in the form of a rigid and perforated walls, between which is located an absorbent material located in two layers, one of which, more rigid, made a solid and profiled, complex profile, consisting of inclined faces that are directed downward and connected to the horizontal edges, which are made of resonant holes, and the other is soft, made discontinuous and is located under the sound-reflecting surfaces of the first layer, and a continuous profiled layer of sound-absorbing material made of a material whose coefficient of reflection of sound is greater than the coefficient of sound absorption, and elements of material over the most noisy technological equipment contain a frame which is hooked over the hooks, e.g. the measures on cables either directly attached to a rigid wall or ceiling industrial premises, and the frame is covered with the outer side of the foil, preventing the deposition of dust, and to the bottom of the frame with the inner side of the fixed reactive resonance box, separated by partitions, with holes that act necks of Helmholtz resonators arranged in series, and an active part of the elements of material is a filled with sound-absorbing material in the cavity between the frame and insert the filling is made of absorbent non-combustible material, such as viviparum, fiberglass, with a protective layer of glass, which prevents loss of sound absorbing material, and the shape of the frame and the insert can be round or polyhedral, and the frame may be perforated to increase the surface absorption, characterized in that the ratio (H/W) the parameters of the production premises to the thickness H1acoustic fencing lies in the optimal interval 0,0007...0,006, and the ratio (H/W) room height and width to the ratio (N2/R) of the thickness of the material to its height suspension lies in the optimum range of values of 0.27...to 0.68.



 

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