Sound absorbing design of shop

FIELD: machine building.

SUBSTANCE: here are disclosed sound absorbing devices of shop floor. These devices contain profiled and perforated walls with a layer of sound absorbing material between them. Also, one of the walls is flat. Sound absorbing material is arranged in two layers. One, more rigid, layer is solid and profiled; another, more soft one, is non-continuous and is laid under surfaces of the first layer. The sound absorbing devices of the shop floor have a frame, window and door openings, and openings for arrangement of lights and acoustic barriers with flat and perforated walls with sound absorbing material in two layers. One, more rigid layer, is solid and profiled. Another, more soft layer, is non-continuous in form of non-continuous sound absorbers. It is positioned is a focus of sound reflecting surfaces of the first layer. The continuous profiled layer of sound absorbing material is made out of material with sound reflection factor higher, than sound absorbing factor. The non-continuous sound absorber located in the focus of the solid profiled layer is made in form of solids of revolution, for example, sphere, ellipsoid, cone, or truncated cone and is secured on the perforated wall by means of pins, one end of which is rigidly attached to the perforated wall, while another one is pointed and enters the body of non-continuous sound absorbers.

EFFECT: raised efficiency of noise absorbing due to extended frequency range and secondary absorbing sound waves reflected from sound absorber.

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 a sound absorbing panel as the USSR №348755, 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 absorbing design of the shop 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 profilirovav the tion, and the other, soft, made discontinuous and is located beneath the surface of the first layer, sound-absorbing device production facilities contain a frame, window, door openings, openings for placement of lamps and acoustic enclosures containing smooth and perforated walls, between which is placed an absorbent material located in two layers, one of which, more rigid, made a solid and profiled, and the other, soft, made discontinuous in the form of intermittent heat sinks and is located in the focus of the sound-reflecting surfaces of the first layer, continuous profiled layer of sound-absorbing material made of a material whose coefficient of reflection of sound more than the sound absorption coefficient, and intermittent absorber located at the focus of a continuous profiled layer, is made in the form of bodies of revolution such as a sphere, ellipsoid, cone, truncated cone, and is secured to a perforated wall with pins, one end of which is rigidly attached to a perforated wall, and the other made a pointed and is located in the body intermittent heat sinks, and elements of material over the most noisy technological equipment contain a frame which is hooked over the hooks, for example, on cables either directly rigidly attached to the wall or ceiling industrial premises, the frame is made in the form of two cubic surfaces, one of which is foreign - made perforated and the other inner - acoustically transparent, and sound-absorbing material wrapped mesh nylon cloth, is located between the frames, which are interconnected by means of resonant inserts and different diameter holes, and the inner cavity is divided by a partition into two resonant cavities, one of which may be filled with material, and in a resonant inserts can be placed lamps with power supply, and the filling is made of absorbent non-combustible material, such as viviparum, fiberglass, with a protective layer of fiberglass, preventing loss of material, characterized in that the ratio of the ratio (H/W) the parameters of the production premises to the thickness H1acoustic fencing lies in the optimum range of values 0,0007...0,006, and the ratio (H/W) room height and width to the ratio (H2/R) of the thickness of the material to its height suspension lies in the optimum range of values of 0.27...to 0.68.

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 W is mnim technological equipment.

Sound-absorbing device manufacturing 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 fence (figure 2), contains smooth 13 and the perforated wall 14, between which is placed an absorbent material located in two layers, one of which, more than 15 hard, made a solid and profiled, and the other, a soft 16, made discontinuous in the form of intermittent heat sinks and is located in the focus of the sound-reflecting surfaces of the first layer 15.

Solid shaped sound absorbing layer 15 of a material made of a material whose coefficient of reflection of sound is greater than the coefficient of sound absorption. Intermittent material 16 located at the focus of a continuous profiled layer 15 made in the form of bodies of revolution such as a sphere, ellipsoid, cone, truncated cone, and is mounted on a perforated wall 14 by means of pins 17, one end of which is rigidly attached to a perforated wall 14, and the other made a pointed and is located in the body intermittent heat sinks 16.

The absorbent element (figure 3) over the most noisy process equipment consists of a rigid frame 18 which is hooked over the hooks on the cables 19 to the ceiling 20 production is the result of a building. The frame is made in the form of two cubic surfaces, one of which is external 18 - made perforated and the other internal 21 - acoustically transparent, and sound absorbing material 22, the wrapped mesh nylon cloth, is located between the frames, which are interconnected by means of resonant inserts 23 and 24 of different diameters of holes 25 and 26, and an internal cavity separated by a partition 27 into two resonant cavities 28 and 29, one of which may be filled with material. In a resonant inserts 23 may be placed lamps 30 with power supply (not shown). Filling exercise absorbent non-flammable material (for example, Vinprom, fiberglass) with a protective layer of glass, preventing loss of material.

Sound-absorbing device production facilities are as follows. Sound waves propagating in the production area interact as follows. Sound energy from equipment 11 in the room, passing through the perforated 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 what poverhnosti the first layer 15. The transfer of sound energy into heat (dissipation, the dissipation of energy occurs in the pores of the material, which is a model of cavities "Helmholtz", 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 glass, such as type EZ-100, located between the absorber and the perforated wall.

The absorbent element on the most noisy technological equipment operates as follows. Sound waves propagating in the production area, interact with the filled material 22 cavities. The absorption at low and medium frequencies is due to the acoustic effect based on the principle of Helmholtz resonators formed by the cavities 28 and 29. Various amounts of the resonant cavities are used to suppress the sound vibrations in the desired audio frequency range, as a rule, large amounts of noise reduction at low frequencies and small - in the region of medium and high frequencies.

The interaction of sound in the n active cavities, filled with non-combustible absorbent 22, causes samohlasen in the high frequency range, and due to the presence of cavities 29 increases the surface absorption and, consequently, increases the rate of absorption.

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 setting the piece of material 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 implementation of non-combustible absorbent materials makes the design fire-safe.

The technical solution is an effective tool for noise in manufacturing plants, textile and other industries.

Sound design workshop, 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 intermittent loc the wives under the surface of the first layer, this sound-absorbing device production facilities contain a frame, window, door openings, openings for placement of lamps and acoustic enclosures containing smooth and perforated walls, between which is placed an absorbent material located in two layers, one of which, more rigid, made a solid and profiled, and the other is soft, made discontinuous in the form of intermittent heat sinks and is located in the focus of the sound-reflecting surfaces of the first layer, 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 intermittent absorber located at the focus of a continuous profiled layer is made in the form of bodies of revolution such as a sphere, ellipsoid, cone, truncated cone, and is secured to a perforated wall with pins, one end of which is rigidly attached to a perforated wall, and the other made a pointed and is located in the body intermittent heat sinks, and elements of material over the most noisy equipment, contain the frame, hang the hooks, for example, on cables either directly attached to a rigid wall or ceiling industrial premises, and the frame is made is of the form in the form of two cubic surfaces, one of which the outer is made of perforated, and the other inner - acoustically transparent, and sound-absorbing material wrapped mesh nylon cloth, is located between the frames, which are interconnected by means of resonant inserts and different diameter holes, and the inner cavity is divided by a partition into two resonant cavities, one of which may be filled with material, and in a resonant inserts can be placed lamps with power supply, and the filling is made of absorbent non-combustible material, such as viviparum, fiberglass, with a protective layer of glass, preventing the loss of material, characterized in that the relationship is (H/W) of the parameters of the production premises to the thickness H1acoustic fencing lies in the optimum range of values 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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