A perforated plate strip with a sound absorption effect

Abstract

The application discloses a porous plate strip fence plate with a sound absorption effect, and belongs to the field of building plates.The porous plate strip fence plate comprises a plate made of a porous material, and a strip fence structure laid on the surface of the plate, wherein the strip fence structure is composed of at least two rectangular strip fences arranged at intervals; wherein the porous plate strip fence plate has the following structural parameters: the height l1 of the strip fence structure, the range of l1 is 1-100 mm; the ratio S1 / S0 between the half of the distance of the gap formed by the two adjacent rectangular strip fences and the thickness of the plate, the range of S1 / S0 is 1 / 30-25 / 9; and the half l0 of the length of the plate under the strip fence center of the two adjacent rectangular strip fences, the range of l0 is 15-100 mm.

Description

Technical Field

[0001] This invention relates to the field of building panels, and more particularly to a porous panel strip grid with adjustable sound absorption effect. Background Technology

[0002] In the field of building panels, sound absorption performance of the panels needs to be guaranteed for user comfort.

[0003] In related technologies, in order to increase the sound absorption performance of the board, a cavity is often added behind the board. However, adding a cavity requires a complicated process: laying a large area of ​​board with a cavity often requires building a keel and then laying the board on the keel; or, the board is cut into V-grooves and then folded to form a box-shaped structure before being attached to the wall.

[0004] Therefore, how to design a board material with good sound absorption effect and easy installation is an urgent problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a porous plate grid with adjustable sound absorption effect, which has good adjustable sound absorption effect and is easy to install.

[0006] To achieve the above-mentioned objectives, the present invention proposes the following technical solution:

[0007] A porous sheet metal strip grid with adjustable sound absorption effect, the porous sheet metal strip grid comprising:

[0008] The sheet material is made of a porous material;

[0009] A grid structure laid on the surface of the plate, the grid structure being composed of at least two rectangular grids spaced apart;

[0010] The porous plate grid has the following structural parameters:

[0011] The height l1 of the strip structure is 1 to 100 mm.

[0012] The ratio S1 / S0 between half the distance between the gaps formed by two adjacent rectangular strips and the thickness of the plate, where S1 / S0 ranges from 1 / 30 to 25 / 9;

[0013] The length of the plate below the center of two adjacent rectangular strips is half of the length l0, and l0 ranges from 15 to 100 mm.

[0014] In one possible implementation, l1 ranges from 10 to 50 mm.

[0015] In one possible implementation, the range of S1 / S0 is 2.5 / 9 to 10 / 9.

[0016] In one possible implementation, l0 ranges from 15 to 50 mm.

[0017] In one possible implementation, the material type of the grating structure includes at least one of the following:

[0018] Metal, wood, plastic, rubber, stone.

[0019] In one possible implementation, the material type of the sheet metal includes at least one of the following:

[0020] PET, perforated sheets, slotted sheets, and metal foam.

[0021] In one possible implementation, the strip structure further includes:

[0022] The area gradient structure disposed above the rectangular grid is a structure in which the cross-sectional area gradually changes.

[0023] In one possible implementation, the line connecting the top center point and the bottom boundary point in the cross-section of the area-gradient structure is:

[0024] Straight line;

[0025] or,

[0026] Curved type;

[0027] or,

[0028] streamline.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The porous panel strip grid plate provided by this invention includes: a panel made of porous material; and a grid structure laid on the surface of the panel, the grid structure consisting of at least two rectangular grids spaced apart. This type of porous panel strip grid plate has good sound absorption effect and can be directly attached to a wall, making installation simple. Furthermore, the porous panel strip grid plate has the following structural parameters: the height l1 of the grid structure, l1 ranging from 1 to 100 mm; the ratio S1 / S0 between half the distance between two adjacent rectangular grids and the thickness of the panel, S1 / S0 ranging from 1 / 30 to 25 / 9; and half the length l0 of the panel below the center of two adjacent rectangular grids, l0 ranging from 15 to 100 mm. By setting these structural parameters, the resonant frequency of the porous panel strip grid plate can be adjusted to the mid-low frequency range, thereby effectively ensuring the mid-low frequency sound absorption effect of the porous panel strip grid plate.

[0031] Furthermore, the range of the above structural parameters is further narrowed, and combined with the sound absorption of the porous plate strip grid in the low frequency range, the low frequency sound absorption effect of the porous plate strip grid is effectively guaranteed.

[0032] Furthermore, an area-gradient structure is added above the rectangular grid. The area-gradient structure is a structure in which the cross-sectional area gradually changes. This structure can increase the impedance matching degree of high frequencies while introducing resonance, thereby significantly improving the sound absorption performance of mid-to-high frequencies while ensuring the sound absorption performance of mid-to-low frequencies.

[0033] It should be noted that the present invention only needs to achieve at least one of the above-mentioned technical effects. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a porous plate strip grid with adjustable sound absorption effect provided in the embodiments of this application;

[0035] Figure 2 This is a schematic diagram comparing the sound absorption coefficients of a solid wall-mounted panel and a porous panel strip provided in the embodiments of this application;

[0036] Figure 3 This is a cross-sectional view of a porous plate grid provided in an embodiment of this application;

[0037] Figure 4 This is a comparative schematic diagram of a sound absorption coefficient curve provided in the embodiments of this application;

[0038] Figure 5 This is a comparative schematic diagram of another sound absorption coefficient curve provided in the embodiments of this application;

[0039] Figure 6 This is a comparative schematic diagram of another sound absorption coefficient curve provided in the embodiments of this application;

[0040] Figure 7 This is a cross-sectional view of another porous plate grid provided in the embodiments of this application;

[0041] Figure 8 This is a cross-sectional view of another porous plate grid provided in the embodiments of this application;

[0042] Figure 9 This is a comparative schematic diagram of another sound absorption coefficient curve provided in the embodiments of this application.

[0043] In the diagram, 100 represents a porous plate with bar grids, 10 represents a plate material, and 20 represents a bar grid structure. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0045] In the description of this invention, it should be understood that the terms "vertical," "upper," "lower," "top," "side," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] To address the issue that adding a cavity behind the board to ensure sound absorption performance in related technologies involves complex installation procedures, this application provides a porous board with a grid structure. A grid structure is laid on the surface of the porous material board, and the parameters of the structure are controlled to adjust the sound absorption coefficient curve. It has good sound absorption control effect and is easy to install.

[0048] The technical solutions provided in the embodiments of this application will be described below.

[0049] Reference Figure 1This application provides a porous board strip grid plate 100 (hereinafter referred to as porous board strip grid plate 100) with adjustable sound absorption effect. The porous board strip grid plate 100 includes: a board 10, which is made of porous material; and a grid structure 20 laid on the surface of the board 10, which is composed of at least two rectangular grids spaced apart.

[0050] In this embodiment, a porous material board 10 can be attached to a wall surface, the material surface can be treated, and a grid structure 20 can be laid to form a porous material grid board 100, so that the porous material grid board 100 produces a good sound absorption effect and is easy to install.

[0051] The strip structure 20 can be laid on the surface of the board 10 by either adhesive or nail gun.

[0052] Generally speaking, when a board is applied directly to a wall surface without any cavities, its sound absorption coefficient is relatively low. In this state, the Noise Reduction Coefficient (NRC) typically does not exceed 0.4.

[0053] For example, in conjunction with reference Figure 2 It shows a comparison of the sound absorption coefficients of a panel directly attached to the wall and a panel with the added grid structure 20, by Figure 2 It can be seen that when a 9mm standard board is directly attached to a wall, its overall sound absorption performance increases with frequency across the entire mid-to-low frequency range (100Hz-2000Hz), but the effect is not good. The sound absorption performance is almost negligible below 500Hz, and the sound absorption coefficient only reaches about 0.4 at 2000Hz. After adding a strip grid structure 20 to the directly attached standard board, the sound absorption coefficient increases significantly, with an absorption peak appearing around 1450Hz, and the overall sound absorption performance is greatly improved. The NRC performance of the two boards is calculated based on the curves, and the comparison is shown in Table 1 below:

[0054] Table 1 Comparison of NRC coefficients in the two cases

[0055] 9mm standard board solid mounting 0.15 9mm standard board solid bonding + strip structure 0.45

[0056] It is evident that the strip grid structure 20 can introduce additional resonance peaks, significantly increasing sound absorption performance and greatly improving the NRC coefficient.

[0057] In one possible implementation, the material type of the grid structure 20 includes at least one of the following: metal, wood, plastic, rubber, and stone.

[0058] In this implementation, the material of the grating structure 20 is a material with an acoustic impedance 50-100 times greater than that of air, such as metal, wood, plastic, rubber, or stone.

[0059] It is understood that adjacent rectangular strips in the strip structure 20 can be set at equal intervals or at unequal intervals, and this application does not impose any restrictions on this.

[0060] In one possible implementation, the material type of the sheet includes at least one of the following: PET, perforated sheet, slotted sheet, and foamed metal.

[0061] In this implementation, the board material is a porous material with significant acoustic impedance, which can absorb sound, such as PET, perforated board, slotted board, and foam metal.

[0062] In this embodiment, the porous panel 100 has the following structural parameters: the height l1 of the grating structure 20, where l1 ranges from 1 to 100 mm; the ratio S1 / S0 between half the distance between the gaps formed by two adjacent rectangular gratings and the thickness of the panel 10, where S1 / S0 ranges from 1 / 30 to 25 / 9; and half the length l0 of the panel 10 below the center of two adjacent rectangular gratings, where l0 ranges from 15 to 100 mm. With these structural parameters, a broadband resonance can be additionally formed, thereby significantly enhancing the sound absorption performance in the mid-to-low frequency range, thus improving the sound absorption and noise reduction performance of the panel.

[0063] For example, a porous plate slatted grid 100 is modeled, such as... Figure 3 The image shows a cross-sectional view of the porous plate grid 100. Sound waves are incident from left to right. Considering the symmetry of the structure, only the upper half needs to be considered. The diagonal grid section on the right is the plate 10 made of porous material, the black square in the middle is the rigid grid structure 20, and the remaining white parts are air.

[0064] For the overall structure, at the dotted line on the top (left) side of the bar grid structure 20, the impedance Z can be written as:

[0065]

[0066] Where j is an imaginary number, ρ0 and c0 are the density and speed of sound of air, ρ and c are the acoustic equivalent density and speed of sound of plate 10, k1 = ω / c0 is the wave number in air, ω = 2πf is the angular frequency, f is the sound wave frequency, k0 = ω / c is the wave number within plate 10, S2 is half the distance between the centers of two adjacent rectangular gratings, S1 is half the distance of the gap formed by two adjacent rectangular gratings, S0 is the thickness of plate 10, l1 is the height of the grating structure, and l0 is half the length of plate 10 below the center of two adjacent rectangular gratings.

[0067] For the structure to resonate, the imaginary part of the impedance Z needs to be zero, which can be calculated using the above formula:

[0068]

[0069] This is the resonance condition, and the resonance frequency can be determined using the graphical method. Therefore, compared to solid bonding of the board material, this structure can explicitly introduce resonance, thereby adjusting the sound absorption performance.

[0070] Some patterns can be deduced from the above formulas:

[0071] (1) The longer l1 is, the lower the resonant frequency;

[0072] (2) The smaller the ratio of S1 / S0, the lower the resonant frequency;

[0073] (3) The larger l0 is, the lower the resonant frequency is.

[0074] The following examples illustrate the setting of the above structural parameters.

[0075] (1) Keep other parameters unchanged and change the height l1 of the bar grid.

[0076] S2 = 25mm, S1 = 10mm, S0 = 9mm, l0 = 25mm, air density ρ0 = 1.21kg / m³ 3 c0 = 343 m / s, and a standard plate with the following parameters is selected: porosity 0.97, flow resistance 74031 Pas / m 2 With a tortuosity factor of 1.0175, a viscous characteristic length of 5e-4m, and a thermal characteristic length of 7.6e-5m, the acoustic equivalent density and sound velocity ρ,c can be calculated based on these parameters using the Johnson-Champoux-Allard model for porous materials.

[0077] Reference Figure 4 The diagram shows the sound absorption coefficient curve as a function of l1. It can be seen that the resonant frequency gradually decreases with increasing l1. When l1 ranges from 1 to 100 mm, the resonant frequency falls within the mid-to-low frequency range.

[0078] In one possible implementation, l1 ranges from 10 to 50 mm.

[0079] In this implementation, since human voices generally belong to the low-frequency range (within 1500Hz), to further ensure the sound absorption effect in the low-frequency range, the range of l1 can be limited to 10 to 50mm. Furthermore, for aesthetic reasons in engineering, the range of l1 can be limited to 10 to 20mm.

[0080] (2) Keep other parameters unchanged and change the ratio of S1 / S0.

[0081] S2 = 25mm, l1 = 20mm, S0 = 9mm, l0 = 25mm, air density ρ0 = 1.21kg / m³ 3 c0 = 343 m / s, and a standard plate with the following parameters is selected: porosity 0.97, flow resistance 74031 Pas / m 2 With a tortuosity factor of 1.0175, a viscous characteristic length of 5e-4m, and a thermal characteristic length of 7.6e-5m, the acoustic equivalent density and sound velocity ρ,c can be calculated based on these parameters using the Johnson-Champoux-Allard model for porous materials.

[0082] Reference Figure 5 The diagram illustrates the change in sound absorption coefficient as a function of S1 / S0. It shows that the resonant frequency gradually decreases as S1 / S0 decreases. When S1 / S0 ranges from 1 / 30 to 25 / 9, the resonant frequency falls within the mid-to-low frequency range.

[0083] In one possible implementation, the range of S1 / S0 is 2.5 / 9 to 10 / 9.

[0084] In this implementation, since human voices are generally in the low-frequency range (within the 1500Hz range), in order to further ensure the sound absorption effect in the low-frequency range, the range of S1 / S0 can be limited to 2.5 / 9 to 10 / 9.

[0085] (3) Keep other parameters unchanged and change the length of l0.

[0086] l1 = 20 mm, S0 = 9 mm, S1 = 10 mm, air density ρ0 = 1.21 kg / m³ 3 c0 = 343 m / s

[0087] The selected board is a standard board with the following parameters: porosity 0.97, flow resistance 74031 Pas / m. 2With a tortuosity factor of 1.0175, a viscous characteristic length of 5e-4m, and a thermal characteristic length of 7.6e-5m, the acoustic equivalent density and sound velocity ρ,c can be calculated based on these parameters using the Johnson-Champoux-Allard model for porous materials.

[0088] Reference Figure 6 The diagram shows the sound absorption coefficient curve as a function of l0. It can be seen that the resonant frequency gradually decreases with increasing l0. When l0 ranges from 15 to 100 mm, the resonant frequency falls within the mid-to-low frequency range.

[0089] In one possible implementation, l0 ranges from 15 to 50 mm.

[0090] In this implementation, since human voices generally belong to the low-frequency range (within the 1500Hz range), to further ensure the sound absorption effect in the low-frequency range, the range of l0 can be limited to 15 to 50mm. Furthermore, for aesthetic reasons in engineering, the range of l0 can be limited to 20 to 30mm.

[0091] In summary, the technical solution provided in this application embodiment includes a porous plate strip grid panel 100 comprising: a plate 10 made of porous material; and a grid structure 20 laid on the surface of the plate 10, the grid structure 20 being composed of at least two rectangular grids spaced at equal intervals. This type of porous plate strip grid panel 100 has good sound absorption performance and can be directly attached to a wall, making installation simple. Furthermore, the porous plate strip grid panel has the following structural parameters: the height l1 of the grid structure, where l1 ranges from... The ratio S1 / S0 between half the distance between two adjacent rectangular strips and the thickness of the board, ranging from 1 / 30 to 25 / 9; half the length l0 of the board 10 below the center of two adjacent rectangular strips, ranging from 15 to 100 mm; by setting these structural parameters, the resonant frequency of the porous board strip 100 can be adjusted to the mid-low frequency range, thereby effectively ensuring the mid-low frequency sound absorption effect of the porous board strip 100.

[0092] Furthermore, the range of the above structural parameters can be further narrowed, and combined with the sound absorption of the porous plate strip grid 100 in the low-frequency range, the low-frequency sound absorption effect of the porous plate strip grid 100 can be effectively guaranteed.

[0093] Based on the above embodiments, in an exemplary embodiment, the strip structure 20 further includes: an area gradient structure disposed above the rectangular strip, wherein the area gradient structure is a structure in which the cross-sectional area gradually changes.

[0094] Among them, the area-gradient structure is a structure in which the cross-sectional area gradually changes in the direction in which the sound wave enters the grating structure from the outside. Specifically, the cross-sectional area of ​​this area-gradient structure increases from small to large, and the area where the sound wave enters the grating structure decreases from large to small.

[0095] The side of the area gradient structure closest to the plate 10 is the bottom, and the bottom is connected to the rectangular grid and can further overlap with the rectangular grid. The side of the area gradient structure away from the plate 10 is the top, and the top can have a top center point.

[0096] In this embodiment of the application, adding some area-gradient structures to the rectangular strip grid can increase the impedance matching degree at high frequencies while introducing resonance, thereby significantly increasing the sound absorption performance of the porous plate strip grid 100 in the mid-to-high frequencies.

[0097] For example, the structure is as follows Figure 7 and Figure 8 The images show a standard bar grid structure and a bar grid structure with added triangular structures, respectively. Figure 8 The triangular structure in the design gives the overall bar grid structure a trumpet-shaped opening. When sound waves enter the bar grid structure from the outside, the gradual change in area makes the impedance more matched, thereby increasing the sound wave energy entering the structure and improving the sound absorption coefficient. Furthermore, when the height l1 of the rectangular bar grid is set relatively small, the overall bar grid structure can appear as a triangular structure.

[0098] Comparison of the sound absorption coefficient curves corresponding to the two structures mentioned above Figure 9 As shown, after adding the area gradient structure, the strip grid plate significantly improves the high-frequency sound absorption coefficient while maintaining almost the same resonant frequency.

[0099] In one alternative implementation, the line connecting the top center point and the bottom boundary point in the cross-section of the area-gradient structure can be: a straight line; or a curved line; or a streamlined line.

[0100] In this implementation, the specific shape of the area gradient structure is not limited. The line connecting the top center point and the bottom boundary point of the area gradient structure can be a straight line, and the area gradient structure will be as follows: Figure 8 The triangular structure shown can also have other forms, such as curved or streamlined lines connecting the top center point and the bottom boundary point, making the area gradient structure exhibit other styles. These styles of area gradient structures will increase the sound absorption coefficient in the mid-to-high frequency range to a certain extent.

[0101] In summary, the technical solution provided in this application provides an area gradient structure above the rectangular grid. The area gradient structure is a structure in which the cross-sectional area gradually changes. This structure can increase the impedance matching degree of high frequencies while introducing resonance, thereby significantly improving the sound absorption performance of mid-to-high frequencies while ensuring the sound absorption performance of mid-to-low frequencies.

[0102] All the above-mentioned optional technical solutions can be combined in any way to form optional embodiments of the present invention. That is, any number of embodiments can be combined to meet the needs of different application scenarios. All of these are within the protection scope of this application and will not be described in detail here.

[0103] It should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A porous sheet metal grid plate with adjustable sound absorption effect, characterized in that, The porous plate grid includes: The sheet material is made of a porous material; A strip grid structure laid on the surface of the plate, the strip grid structure being composed of at least two rectangular strip grids arranged at equal intervals; the strip grid structure also includes an area gradient structure disposed above the rectangular strip grids, the area gradient structure being a structure in which the cross-sectional area gradually changes; The porous plate grid has the following structural parameters: The height l1 of the strip structure is 1 to 100 mm. The ratio S1 / S0 between half the distance between the gaps formed by two adjacent rectangular strips and the thickness of the plate, where S1 / S0 ranges from 1 / 30 to 25 / 9; The length of the plate below the center of two adjacent rectangular strips is half of the length l0, and l0 ranges from 15 to 100 mm.

2. The porous plate grid according to claim 1, characterized in that, The range of l1 is 10 to 50 mm.

3. The porous plate grid according to claim 1, characterized in that, The range of S1 / S0 is from 2.5 / 9 to 10 / 9.

4. The porous plate grid according to claim 1, characterized in that, The range of l0 is 15 to 50 mm.

5. The porous plate grid according to any one of claims 1 to 4, characterized in that, The material type of the grid structure includes at least one of the following: Metal, wood, plastic, stone.

6. The porous plate grid according to any one of claims 1 to 4, characterized in that, The material type of the sheet includes PET.

7. The porous plate grid plate according to claim 1, characterized in that, In the cross-section of the area-gradient structure, the line connecting the top center point and the bottom boundary point is: Straight line; or, Curved shape.

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