Sound barrier top end noise reduction device based on multi-cavity coupling sound absorption structure

Abstract

The utility model discloses a sound barrier top end noise reduction device based on a multi-chamber coupling sound absorption structure, which comprises a sound absorption mechanism, a multi-chamber noise reduction mechanism and an installation fixing groove, the sound absorption mechanism is arranged at the sound source side of the multi-chamber noise reduction mechanism and is mutually coupled with the multi-chamber noise reduction mechanism, and the installation fixing groove is arranged at the bottom of the multi-chamber noise reduction mechanism; the sound absorption mechanism is in an arc shape or a half mushroom shape or a broken line shape. The multi-cavity noise reduction mechanism is composed of a plurality of vertical plates which are staggered in a crossed mode. According to the utility model, the sound absorption mechanism in a specific shape is combined with the multi-cavity noise reduction mechanism, so that the road noise can be effectively eliminated; through the micro-perforated plate on the sound absorption mechanism and the chambers in the multi-chamber noise reduction mechanism, noise in certain high-energy frequency bands can be reduced in a targeted manner.

Description

Technical Field

[0001] The utility model relates to the technical field of noise reduction, in particular to a noise reduction device at the top of a sound barrier based on a multi-chamber coupled sound absorption structure. Background Art

[0002] Sound barrier is a noise reduction device widely used in road traffic noise control. When the noise reduction effect of the sound barrier does not meet the requirements, it is usually considered to increase the height of the sound barrier to improve the noise reduction effect of the sound barrier. However, the increase in the height of the sound barrier will not only increase the cost and reduce the aesthetics, but also increase the intensity of the secondary structure noise for some elevated sections of the line. The top noise reduction device has a lower cost, lower height, lighter weight, and better noise reduction effect. It can effectively reduce the intensity of the "virtual sound source" formed on the top of the sound barrier due to diffraction sound and sound interference phenomena, and effectively improve the insertion loss of the sound barrier.

[0003] In the current field of road traffic management, although the noise reduction device on the top of the sound barrier has achieved good noise reduction effects, the application of the micro-perforated plate sound-absorbing structure is still relatively rare, and further exploration of its noise reduction is needed. In addition, some top noise reducers have a compact structure and an uncoordinated ratio between the chamber depth and chamber width, resulting in a relatively general noise reduction effect.

[0004] Common noise reducers on the top of sound barriers are easily corroded in natural environments due to the use of porous sound-absorbing materials, which causes their noise reduction performance to decrease year by year or requires frequent replacement of parts. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a composite noise reduction device with a simple structure, light weight, long service life, multiple noise reduction mechanisms and stable noise reduction capability.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a noise reduction device at the top of a sound barrier based on a multi-chamber coupled sound absorption structure, comprising a sound absorption mechanism, a multi-chamber noise reduction mechanism and an installation and fixing groove, wherein the sound absorption mechanism is arranged on the sound source side of the multi-chamber noise reduction mechanism and are coupled with each other, and the installation and fixing groove is arranged at the bottom of the multi-chamber noise reduction mechanism; the sound absorption mechanism is in an arc shape, a semi-mushroom shape or a broken line shape; the multi-chamber noise reduction mechanism is composed of a plurality of cross-staggered vertical plates.

[0007] Furthermore, the sound absorbing mechanism is composed of a micro-perforated plate and a fixed plate of the same shape, the fixed plate is located on one side of the multi-chamber noise reduction mechanism, and a cavity is provided between the micro-perforated plate and the fixed plate.

[0008] Further, the specific structure of the sound absorption mechanism being arc-shaped is as follows: both the micro-perforated plate and the fixed plate are of the same arc shape, and the concave surface of the arc is on the side of the multi-chamber noise reduction mechanism; the specific structure of the sound absorption mechanism being semi-mushroom-shaped is as follows: the upper half of both the micro-perforated plate and the fixed plate is arc-shaped, and the lower half of both the micro-perforated plate and the fixed plate is "L"-shaped; the specific structure of the sound absorption mechanism being zigzag-shaped is as follows: both the micro-perforated plate and the fixed plate are "V"-shaped.

[0009] Further, the multi-chamber noise reduction mechanism is composed of multiple horizontal partition plates in the horizontal direction and vertical connecting plates in the vertical direction intersecting with each other. The horizontal partition plates and the vertical connecting plates intersect to form chambers, and a bottom plate is provided in each chamber; the specific connection relationship between the multi-chamber noise reduction mechanism and the sound absorption mechanism is: a fixed plate is connected to the horizontal partition plate on the sound source side, and the top height of the fixed plate is the same as the top height of the horizontal partition plate on the sound source side.

[0010] Further, mounting plates are provided at the bottoms of the horizontal partition plates and the vertical connecting plates, and mounting fixing grooves are provided at the bottoms of the mounting plates.

[0011] Further, the heights of the horizontal partition plates and the bottom plates gradually increase starting from the sound source side, the top of the vertical connecting plate is arc-shaped, and the top of the vertical connecting plate does not exceed the top of the horizontal partition plate.

[0012] Further, drainage gaps are provided on the bottom plates.

[0013] Further, protruding tops are provided at the tops of the horizontal partition plates; communication holes are provided on the vertical connecting plates, and the horizontal height of the communication holes is not lower than the horizontal height of the bottom plates.

[0014] Compared with the existing technology, the present utility model has the following beneficial effects: by adopting a sound absorption mechanism with a specific shape in combination with a multi-chamber noise reduction mechanism, the present utility model can effectively eliminate road noise; through the micro-perforated plate on the sound absorption mechanism and the chambers in the multi-chamber noise reduction mechanism, targeted noise reduction can be carried out for some high-energy frequency bands of noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0016] Figure 2 It is a plan view of the overall structure of the present utility model.

[0017] Figure 3 It is a top view of the present utility model.

[0018] Figure 4 It is a schematic diagram of the semi-mushroom-shaped sound absorption mechanism of the present utility model.

[0019] Figure 5 It is a schematic diagram of the zigzag-shaped sound absorption mechanism of the present utility model.

[0020] In the figure: 1, sound absorption mechanism; 2, multi-chamber noise reduction mechanism; 3, installation and fixing groove; 4, micro-perforated plate; 5, fixing plate; 6, horizontal partition; 7, bottom plate; 8, vertical connecting plate; 9, protruding top; 10, drainage gap; 11, communication hole; 12, chamber; 13, mounting plate. Specific implementation mode

[0021] As Figure 1 shown, the present utility model provides a technical solution: a noise reduction device for the top of a sound barrier based on a multi-chamber coupled sound absorption structure, including a sound absorption mechanism 1, a multi-chamber noise reduction mechanism 2 and an installation and fixing groove 3. The sound absorption mechanism 1 is arranged on the sound source side of the multi-chamber noise reduction mechanism 2 and is coupled with each other. The installation and fixing groove 3 is arranged at the bottom of the multi-chamber noise reduction mechanism 2. The sound absorption mechanism 1 is in an arc shape or a semi-mushroom shape or a zigzag shape. The multi-chamber noise reduction mechanism 2 is composed of multiple vertically arranged vertical plates that cross each other. After the installation and fixing groove 3 is installed on the top of the sound barrier in an inserted manner, further sealing treatment is required, such as using a rubber pad for sealing treatment, etc. The present utility model can effectively eliminate road noise by adopting a sound absorption mechanism 1 with a specific shape in combination with a multi-chamber noise reduction mechanism 2. Through the micro-perforated plate 4 on the sound absorption mechanism 1 and the chamber 12 in the multi-chamber noise reduction mechanism 2, targeted noise reduction can be carried out for some high-energy frequency bands.

[0022] Among them, the sound absorption mechanism 1 is composed of a micro-perforated plate 4 and a fixing plate 5 with the same shape. The fixing plate 5 is on one side of the multi-chamber noise reduction mechanism 2. A cavity is arranged between the micro-perforated plate 4 and the fixing plate 5, and the depth of the cavity can be set to 15-25 mm.

[0023] Among them, in this embodiment, the thickness of the micro-perforated plate 4 can be set to 0.2-1 mm, and the aperture can be set to 0.8-1.2 mm.

[0024] As Figure 2 shown, the multi-chamber noise reduction mechanism 2 is composed of multiple horizontally arranged horizontal partitions 6 and vertically arranged vertical connecting plates 8 that cross each other. The horizontal partitions 6 and the vertical connecting plates 8 cross each other to form a chamber 12. A bottom plate 7 is arranged in each chamber 12, and a drainage gap 10 is arranged on the bottom plate 7. As Figure 3As shown in the figure, the drainage gap 10 can prevent rainwater from accumulating in the chamber 12 during rainy weather; the specific connection relationship between the multi-chamber noise reduction mechanism 2 and the sound absorption mechanism 1 is as follows: a fixing plate 5 is connected to the lateral partition 6 on the sound source side, and the top height of the fixing plate 5 is the same as the top height of the lateral partition 6 on the sound source side; mounting plates 13 are provided at the bottom of the lateral partition 6 and the vertical connecting plate 8, and mounting fixing grooves 3 are provided at the bottom of the mounting plates 13; the lateral partition 6 can improve the overall stiffness of the multi-chamber noise reduction mechanism 2; by arranging the multi-chamber noise reduction mechanism 2 with gradually increasing heights from the sound source side, the present utility model can effectively capture and reduce noise.

[0025] As Figure 4 - Figure 5 shown, the specific structure of the sound absorption mechanism 1 being arc-shaped is as follows: both the micro-perforated plate 4 and the fixing plate 5 are of the same arc shape, and the concave surface of the arc is on the side of the multi-chamber noise reduction mechanism 2; the specific structure of the sound absorption mechanism 1 being semi-mushroom-shaped is as follows: the upper half of both the micro-perforated plate 4 and the fixing plate 5 is arc-shaped, and the lower half of both the micro-perforated plate 4 and the fixing plate 5 is "L"-shaped; the specific structure of the sound absorption mechanism 1 being zigzag-shaped is as follows: both the micro-perforated plate 4 and the fixing plate 5 are "V"-shaped; by setting the sound absorption mechanism 1 in different shapes, the noise reduction performance of the present utility model can be improved.

[0026] Among them, the lateral partition 6 and the vertical connecting plate 8 can be made of metal materials such as aluminum plates or non-metal materials such as PC plates and acrylic plates.

[0027] Among them, the heights of the lateral partition 6 and the bottom plate 7 start from the sound source side and increase step by step. The top of the vertical connecting plate 8 is arc-shaped, and the top of the vertical connecting plate 8 does not exceed the top of the lateral partition 6.

[0028] Among them, a protruding top 9 is provided on the top of the lateral partition 6. The protruding top 9 can be a column, which can further increase the insertion loss of the device and improve the noise reduction ability. A communication hole 11 is provided on the vertical connecting plate 8, and the horizontal height of the communication hole 11 is not lower than the horizontal height of the bottom plate 7; the communication hole 11 can allow the water in different chambers 12 to flow to the drainage gap 10 and be discharged.

[0029] In this embodiment, the thickness of the micro-perforated plate 4 is set to 1 mm, the pore size is set to 1 mm, the perforation rate is set to 1%, the cavity depth of the micro-perforated plate 4 is taken as 45 mm, the cavity depths in the multi-chamber noise reduction mechanism 2 are taken as 170 mm, 160 mm, 152 mm, and 144 mm in sequence from the sound source side, the width of the chamber 12 is taken as 100 mm. At this time, the effective working frequency range is 500 - 5000 Hz, the sound absorption coefficient of the sound absorption mechanism 1 is about 0.8, the resonance frequency is about 500 Hz, and acoustic wave interference occurs in the frequency band of 500 - 630 Hz, and the noise source with relatively concentrated energy in the range of 500 - 630 Hz can be effectively noise-reduced.

[0030] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A noise reduction device for the top of a sound barrier based on a multi-chamber coupled sound absorption structure, comprising a sound absorption mechanism (1), a multi-chamber noise reduction mechanism (2) and a mounting and fixing groove (3), characterized in that: The sound absorption mechanism (1) is arranged on the sound source side of the multi-chamber noise reduction mechanism (2) and is mutually coupled. The installation and fixing groove (3) is arranged at the bottom of the multi-chamber noise reduction mechanism (2); the sound absorption mechanism (1) is in an arc shape, or a semi-mushroom shape, or a broken line shape; the multi-chamber noise reduction mechanism (2) is composed of multiple vertically arranged plates that cross each other in a cross shape.

2. The noise reduction device at the top of the sound barrier based on the multi-chamber coupled sound absorption structure according to claim 1, characterized in that: The sound absorption mechanism (1) is composed of micro-perforated plates (4) and fixing plates (5) with the same shape. The fixing plate (5) is on one side of the multi-chamber noise reduction mechanism (2), and a cavity is arranged between the micro-perforated plate (4) and the fixing plate (5).

3. The noise reduction device for the top of the sound barrier based on the multi-chamber coupled sound absorption structure according to claim 2, characterized in that: The specific structure of the sound absorption mechanism (1) being in an arc shape is: both the micro-perforated plate (4) and the fixing plate (5) are in the same arc shape, and the concave surface of the arc is on the side of the multi-chamber noise reduction mechanism (2); the specific structure of the sound absorption mechanism (1) being in a semi-mushroom shape is: the upper half of both the micro-perforated plate (4) and the fixing plate (5) is in an arc shape, and the lower half of both the micro-perforated plate (4) and the fixing plate (5) is in an "L" shape; the specific structure of the sound absorption mechanism (1) being in a broken line shape is: both the micro-perforated plate (4) and the fixing plate (5) are in a "V" shape.

4. The noise reduction device at the top of the sound barrier based on the multi-chamber coupled sound absorption structure according to claim 3, wherein: The multi-chamber noise reduction mechanism (2) is composed of multiple horizontal partition plates (6) in the horizontal direction and vertical connecting plates (8) in the vertical direction that cross each other. The horizontal partition plates (6) and the vertical connecting plates (8) cross to form chambers (12), and a bottom plate (7) is arranged in each chamber (12); the specific connection relationship between the multi-chamber noise reduction mechanism (2) and the sound absorption mechanism (1) is: a fixing plate (5) is connected to the horizontal partition plate (6) on the sound source side, and the top height of the fixing plate (5) is the same as the top height of the horizontal partition plate (6) on the sound source side.

5. The noise reduction device for the top of the sound barrier based on the multi-chamber coupled sound absorption structure according to claim 4, characterized in that: Mounting plates (13) are arranged at the bottoms of the horizontal partition plates (6) and the vertical connecting plates (8), and mounting and fixing grooves (3) are arranged at the bottoms of the mounting plates (13).

6. The noise reduction device at the top of the sound barrier based on the multi-chamber coupled sound absorption structure according to claim 5, characterized in that: The heights of the horizontal partition plates (6) and the bottom plates (7) gradually increase starting from the sound source side, the top of the vertical connecting plate (8) is arc-shaped, and the top of the vertical connecting plate (8) does not exceed the top of the horizontal partition plate (6).

7. The noise reduction device at the top of the sound barrier based on the multi-chamber coupled sound absorption structure according to claim 6, characterized in that: Drainage gaps (10) are arranged on the bottom plate (7).

8. The noise reduction device at the top of the sound barrier based on the multi-chamber coupled sound absorption structure according to claim 7, characterized in that: Protruding tops (9) are arranged at the tops of the horizontal partition plates (6); communication holes (11) are arranged on the vertical connecting plates (8), and the horizontal height of the communication holes (11) is not lower than the horizontal height of the bottom plate (7).

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