Acoustic attenuation device
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-03-22
- Publication Date
- 2026-03-31
AI Technical Summary
Conventional acoustic attenuation devices require advanced technology and high costs to increase sound absorption efficiency, limiting their effectiveness over a wide frequency spectrum.
The acoustic attenuation device features an absorber with a central axis connecting its first end near the inlet opening to its second end near the outlet opening, accompanied by sound guiding walls that start near the central axis, widen outward, and end at an edge portion, creating resonators for various frequencies and achieving sound attenuation within these walls.
This design enables effective sound absorption across a wide frequency spectrum in a cost-effective manner, utilizing relatively simple means to enhance sound attenuation without the need for expensive technologies.
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Abstract
Description
Technical Field
[0001] The present invention relates to an acoustic attenuation device having an absorber provided with an inlet opening serving as an inlet for sound waves to be attenuated and an outlet opening located on the opposite side of the inlet opening and serving as an outlet for the sound waves.
Background Art
[0002] The type of acoustic attenuation device described at the beginning often has no outlet opening and is known in various forms in the prior art and is used for a very diverse range of specific purposes.
Summary of the Invention
Problems to be Solved by the Invention
[0003] However, conventional acoustic attenuation devices have the drawback that advanced technology and high costs are required to increase the sound absorption efficiency. Therefore, an object of the present invention is to provide an acoustic attenuation device capable of achieving effective sound absorption over a wide frequency spectrum cost-effectively by relatively simple means.
Means for Solving the Problems
[0004] In the acoustic attenuation device of the type described at the beginning, the above object is achieved according to the present invention in that the absorber has a first end close to the inlet opening and a second end on the opposite side of the first end and close to the outlet opening, the first end and the second end are connected via a central axis, and one or more sound guiding walls are provided along the side surface of the central axis between the first end and the second end. These walls start from the center near the inlet opening, widen outward while increasing in width towards the second end, and end at an edge portion at the second end. The starting point of the edge portion is adjacent to the central axis, and the end point is arranged at a predetermined distance from the central axis.
[0005] Preferred embodiments of the present invention are the subject of the dependent claims and include elements that bring about further improvements in solving the problems of the present invention.
[0006] In the acoustic attenuation device of the present invention, the absorber has a first end near the inlet opening and a second end on the opposite side of the first end and near the outlet opening, and the first end and the second end are connected via a central axis, and one or more sound guiding walls are formed on the side surface of the central axis between the first end and the second end along the central axis. These sound guiding walls start from the central axis near the inlet opening, increase in width while spreading outward toward the second end, and end at an edge portion at the second end. The starting point of the edge portion is adjacent to the central axis, and the ending point of the edge portion is arranged at a predetermined distance from the central axis. Due to the combination of these features, resonators of different frequencies are formed by the action of the sound guiding walls with varying widths. In particular, when the outlet opening is arranged in front of the sound reflecting wall, desired sound attenuation occurs within the sound guiding walls.
[0007] According to a first preferred embodiment of the acoustic attenuation device of the present invention, the width of each sound guiding wall increases linearly from the inlet opening near the central axis toward the other end, and the first end of the absorber faces the ending point of the edge portion located at a position away from the central axis via a straight connecting line, and the outer edge of each sound guiding wall is arranged on this connecting line.
[0008] According to another preferred embodiment of the acoustic attenuation device of the present invention, the width of the sound guiding wall increases non-linearly from the inlet opening near the central axis toward the other end, and the first end of the absorber faces the ending point of the edge portion located at a position away from the central axis via a concave curved connecting line, and the outer edge of each sound guiding wall is arranged on this connecting line.
[0009] The sound guiding wall is preferably designed as a hollow rail that opens toward the first end of the absorber.
[0010] Also, in some applications, it may be desirable for the sound guiding wall to be designed as a rail that is at least partially concave toward the second end of the absorber.
[0011] According to an important preferred embodiment of the acoustic attenuation device of the present invention, the sound guiding wall is designed as a rail that is at least partially convex toward the second end of the absorber. The outer edge of the sound guiding wall can be shaped to curve more strongly toward the first end of the absorber than the inner wall facing the outer edge.
[0012] The edge of the sound guiding wall is preferably arranged perpendicular to the central axis. However, according to other embodiments, the edge may be arranged at a predetermined angle with respect to the central axis such that the end point of the edge. Through the extended outer edge, it may extend beyond the starting point of the edge.
[0013] According to a further preferred embodiment of the acoustic attenuation device of the present invention, one or more sound diffusion elements are arranged on the surface of the sound guiding wall, the starting point of which is adjacent to the central axis, and the end point of which is located at the outer edge of each sound guiding wall.
[0014] Also, according to another important preferred embodiment, sound reflection elements oriented perpendicular to the surface of the sound guiding wall are arranged at the edge of the sound guiding wall, the starting point of which is adjacent to the central axis, and the end point of which is located at the outer edge of each sound guiding wall.
[0015] When the absorber has two sound guiding walls, it is preferably designed to have rotational symmetry of 180° with respect to the central axis. When it has three sound guiding walls, it is preferably designed to have rotational symmetry of 120° with respect to the central axis. When it has four sound guiding walls, it is preferably designed to have rotational symmetry of 90° with respect to the central axis.
[0016] Furthermore, the absorber is preferably manufactured from a dimensionally stable rigid material, such as ABS (acrylonitrile-butadiene-styrene copolymer) or PLA (polylactic acid).
[0017] In addition, the absorber can also be manufactured from metals such as stainless steel or aluminum, or concrete.
[0018] As a manufacturing method of the absorber, it is particularly recommended to use FDM (Fused Deposition Modelling).
[0019] The absorber according to the present invention desirably has a height ranging from 5 cm to 50 cm, particularly about 30 cm from the first end to the other end, and the width of the edge of the sound guiding element desirably ranges from 2 cm to 40 cm, particularly about 20 cm.
[0020] One or more absorbers can be preferably arranged in front of the sound reflecting wall, where the central axis of each absorber is arranged perpendicular to the surface of the sound reflecting wall, and the respective outlet openings of the absorbers are arranged to face the sound reflecting wall.
Brief Description of the Drawings
[0021]
Figure 1
Figure 2
Figure 3
Modes for Carrying Out the Invention
[0022] The acoustic attenuation device 100 shown in FIGS. 1 to 3 includes an absorber 110 having an inlet opening 111 serving as an inlet for sound waves to be attenuated and an outlet opening 112 located on the opposite side of the inlet opening 111. The absorber 110 has a first end 113 near the inlet opening 111 and a second end 114 on the opposite side of the first end 113 and near the outlet opening 112, and the first end 113 and the second end 114 are connected via a central axis 115. One or more sound guiding walls 120 are formed on the side surface of the central axis 115 between the first end 113 and the second end 114 along the central axis 115.
[0023] The sound guiding wall 120 starts from the central axis near the inlet opening 111, increases in width while spreading outward toward the second end 114, and ends at an edge portion 130 at the second end 114. The starting point 131 of this edge portion is adjacent to the central axis 115, and the ending point 132 is located at a predetermined distance from the central axis 115.
[0024] The width of each sound guiding wall 120 increases linearly from the central axis near the inlet opening 111 towards the other end 114, and the first end 113 of the absorber 110 faces the end point 132 of the edge part 130 located at a position away from the central axis 115 via a straight connection line 140. The outer edge of each sound guiding wall 120 is arranged on this connection line 140.
[0025] The sound guiding wall 120 is designed as a hollow rail opening towards the first end 113 of the absorber 110 and is at least partially convex towards the second end 114 of the absorber 110.
[0026] In this design, the outer edge of the sound guiding wall 120 is more strongly curved towards the first end of the absorber 110 than the inner wall facing the outer edge. The edge part 130 of the sound guiding wall 120 is arranged perpendicular to the central axis 115.
[0027] According to an embodiment of the acoustic attenuation device 100 of the present invention shown in FIG. 2, one or more sound diffusion elements 150 are arranged on the surface of the sound guiding wall 120, the starting point thereof is adjacent to the central axis 115, and the end point 132 is located at the outer edge of each sound guiding wall 120.
[0028] According to a preferred embodiment of the acoustic attenuation device 100 of the present invention shown in FIG. 2, a sound reflection element 160 oriented perpendicular to the surface of the sound guiding wall 120 is arranged at the edge part 130 of the sound guiding wall 120. The starting point 131 of this sound reflection element 160 is adjacent to the central axis 115, and the end point 132 is located at the outer edge of each sound guiding wall 120.
[0029] The illustrated absorber 110 includes three sound guiding walls 120 and is designed to have rotational symmetry of 120° about the central axis 115.
[0030] The absorber 110 is made of a dimensionally stable hard material, in this case specifically ABS (acrylonitrile-butadiene-styrene copolymer).
[0031] The height of the absorber 110 is approximately 30 cm from the first end 113 to the other end 114, and the width of the edge portion 130 of the sound guiding element is 20 cm.
[0032] According to the present invention, one or more of the illustrated absorbers 110 are arranged in front of the sound reflecting wall 200 such that the central axis 115 of each absorber 110 is perpendicular to the surface of the sound reflecting wall 200 and each outlet opening 112 of the absorber 110 faces the sound reflecting wall 200.
[0033] The embodiments of the present invention described above are for the purpose of facilitating understanding of the technical idea of the invention defined in the claims, and do not limit the technical idea to such embodiments.
Explanation of Reference Numerals
[0034] 100 Acoustic attenuation device 110 Absorber 111 Inlet opening 112 Outlet opening 113 First end 114 Other end 115 Central axis 116 Outer edge 120 Sound guiding wall 130 Edge portion 131 Starting point 132 End point 140 Straight connecting line 150 Sound diffusing element 160 Sound reflecting element 200 Sound reflecting wall
Claims
1. A sound-absorbing device (100) comprising a sound-absorbing body (110) having an inlet opening (111) for allowing sound waves to be attenuated to flow in, and an outlet opening (112) opposite to the inlet opening (111), The sound-absorbing body (110) has a first end (113) located near the inlet opening (111) and a second end (114) facing the first end (113) and located near the outlet opening (112). The first end (113) and the second end (114) are connected to each other by a central axis (115), Between the first end (113) and the second end (114), one or more sound-conducting walls (120) are formed laterally with respect to the central axis (115). The one or more sound-conducting walls (120) begin from the central axis (115) near the entrance opening (111), extend outward in the direction of the second end (114) while increasing in width, and terminate at the edge (130) provided at the second end (114). A sound-dampening device wherein the starting point (131) of the edge portion (130) is adjacent to the central axis (115), and the ending point (132) of the edge portion (130) is located at a predetermined distance from the central axis (115).
2. The width of each sound conductor wall (120) increases linearly from the central axis (115) in the vicinity of the entrance opening (111) toward the second end (114), The first end (113) of the sound-absorbing body (110) faces the endpoint (132) of the edge portion (130) which is separated from the central axis (115) via a straight connecting line (140). The sound-dampening device according to claim 1, wherein the outer edge of each sound-guiding wall (120) is located on the connecting line (140).
3. The width of the sound conductor wall (120) increases nonlinearly from the central axis (115) in the vicinity of the entrance opening (111) toward the second end (114), The first end (113) of the sound-absorbing body (110) faces the endpoint (132) of the edge portion (130) which is separated from the central axis (115) via a concavely curved connecting line (140). The sound-dampening device according to claim 1, wherein the outer edge of each sound-guiding wall (120) is located on the connecting line (140).
4. The sound silencing device according to claim 1, wherein the sound guiding wall (120) is formed as a hollow rail opening toward the first end (113) of the sound absorbing body (110).
5. The sound-dampening device according to claim 1, wherein the sound-guiding wall (120) is formed as a rail that is at least partially convex in the direction of the second end (114).
6. The sound-dampening device according to claim 1, wherein the sound-guiding wall (120) is formed as a rail that is at least partially concave in the direction of the second end (114).
7. The sound-dampening device according to claim 4, wherein the outer edge of the sound-guiding wall (120) is more strongly curved toward the first end (113) than the inner wall opposite the outer edge.
8. The sound-dampening device according to claim 5, wherein the outer edge of the sound-guiding wall (120) is more strongly curved toward the first end (113) than the inner wall opposite the outer edge.
9. The sound-dampening device according to claim 6, wherein the outer edge of the sound-guiding wall (120) is more strongly curved toward the first end (113) than the inner wall opposite the outer edge.
10. The sound-dampening device according to any one of claims 1 to 9, wherein the edge portion (130) is oriented so as to be perpendicular to the central axis (115).
11. The edge portion (130) is oriented at a predetermined angle with respect to the central axis (115), The sound-dampening device according to any one of claims 1 to 9, wherein the endpoint (132) of the edge (130) extends beyond the starting point (131) of the edge (130) by an extended outer edge.
12. One or more sound diffusion elements (150) are arranged on the surface of the sound conductor wall (120), The sound-dampening device according to any one of claims 1 to 9, wherein the starting point of the sound diffusion element (150) is adjacent to the central axis (115) and its endpoint is located at the outer edge of each sound-guiding wall (120).
13. The sound-absorbing body (110) has two, three, or four sound-conducting walls (120) arranged rotationally symmetrically around the central axis (115), the sound-absorbing device according to any one of claims 1 to 6.
14. A sound reflecting element (160) oriented substantially perpendicular to the surface of the sound conductor wall (120) is arranged on the edge (130) of the sound conductor wall (120), The sound-dampening device according to any one of claims 1 to 6, wherein the starting point of the sound-reflecting element (160) is adjacent to the central axis (115) and its endpoint is located at the outer edge of each sound-guiding wall (120).