Sound absorbing panels and structures

Abstract

To provide a sound absorption panel and sound absorption structure capable of reducing noise from a horizontal direction with a closed space as a sound source generated by the travelling of vehicles.SOLUTION: A sound absorption panel comprises: a plurality of vertically extending reflectors 20 arranged substantially parallel to each other; support members 10 supporting the reflectors 20; and a sound absorption material 30 filling the space between the reflectors 20. The reflectors 20 are inclined in the traveling direction of sound emitted from a sound source 40.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an acoustical panel and an acoustical structure. [Background technology]

[0002] In the past, in order to reduce noise caused by the movement of vehicles and the like, sound-absorbing panels with built-in reflectors have been proposed for use along expressways or railways, between sidewalks and roadways, in central reservation strips, etc., and soundproof walls equipped with such sound-absorbing panels have been put to practical use (see, for example, Patent Document 1). The soundproof wall described in Patent Document 1 is intended to reduce noise whose main source is lower-part noise, such as rolling noise and equipment noise, generated underneath the vehicle, and therefore has a rational structure for reducing noise whose main source is lower-part noise coming from vertically below the soundproof wall. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-255098 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in installation locations such as near the exit of a highway or railway tunnel, or near the entrance to a hood-type railway station, where noise from the horizontal direction originating from a closed space such as a tunnel as a vehicle moves is the predominant source, the sound absorption performance of the soundproof wall described in Patent Document 1 is insufficient.

[0005] Therefore, an object of the present invention is to provide a sound-absorbing panel and a sound-absorbing structure capable of reducing noise from the horizontal direction, the noise source of which is an enclosed space, associated with the movement of a vehicle or the like. [Means for solving the problem]

[0006] The present invention has been made to solve the above problems, and the gist of the present invention is as follows. [1] A sound-absorbing panel comprising a plurality of vertically extending reflecting plates arranged approximately parallel to one another, a support member supporting the reflecting plates, and a sound-absorbing material filling the space between the reflecting plates, the reflecting plates being inclined toward the direction of sound travelling from a sound source. [2] The sound-absorbing panel described in [1], wherein the support member has a support surface that supports one side of the reflector extending vertically. [3] The sound-absorbing panel according to [1] or [2], wherein the angle between the reflector and the support surface of the support member is greater than or equal to 15° and less than or equal to 75°. [4] The sound-absorbing panel according to any one of [1] to [3], wherein in the normal direction of the support surface of the support member, the ratio of the area in which the reflecting plate is present to the total thickness of the sound-absorbing material is 0.90 or less. [5] The sound-absorbing panel according to any one of [1] to [4], wherein the thickness of the reflector is 0.1 mm or more and 3.2 mm or less. [6] The sound-absorbing panel according to any one of [1] to [5], wherein the thickness of the sound-absorbing material in the normal direction of the support surface of the support member is 125 mm or less. [7] The sound-absorbing panel described in any one of [1] to [6], wherein the support member is installed inside the hollow shape on the opposite surface of the main opposing surfaces of a hollow-shaped housing that faces the main sound incident surface. [8] The sound-absorbing panel according to any one of [1] to [7], wherein the support member constitutes one of the main opposing surfaces of a hollow housing, the surface opposite the main sound incidence surface. [9] The sound-absorbing panel according to [7] or [8], wherein the housing has a hollow shape inside which the reflector and the sound-absorbing material are placed.

[10] The sound-absorbing panel according to any one of [7] to [9], wherein the entrance surface and the opposite surface among the surfaces constituting the housing are provided with a large number of through holes.

[11] A sound-absorbing structure comprising the sound-absorbing panel according to any one of [1] to

[10] installed on an installation wall, wherein there is a gap of 5 mm or more between the sound-absorbing panel and the installation wall. Effect of the Invention

[0007] According to the present invention, it is possible to provide a sound-absorbing panel and a sound-absorbing structure capable of reducing noise from the horizontal direction, which is generated from an enclosed space as a sound source when a vehicle or the like is traveling. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1(a) is a schematic top cross-sectional view of a sound-absorbing panel according to an embodiment of the present invention, and FIG. 1(b) is a schematic side view of the sound-absorbing panel according to the embodiment of the present invention. [Diagram 2] 1 is a schematic top cross-sectional view (part 1) of a sound-absorbing panel housed in a housing according to an embodiment of the present invention. FIG. [Diagram 3] 2 is a schematic top cross-sectional view (part 2) of a sound-absorbing panel housed in a housing according to an embodiment of the present invention. FIG. [Figure 4] 1 is a schematic top cross-sectional view of a sound absorbing structure according to an embodiment of the present invention. [Diagram 5] 1 is a diagram for explaining the ratio of an area where a reflector is present to the total thickness of a sound-absorbing material in a normal direction of a support surface of a support member of a sound-absorbing structure according to an embodiment of the present invention. FIG. [Figure 6] 1A to 1C are diagrams showing specific examples of installation locations of a sound absorbing structure according to an embodiment of the present invention. [Figure 7] FIG. 7(a) is a schematic top cross-sectional view of the sound-absorbing panel of Comparative Example 1-1, and FIG. 7(b) is a schematic side view of the sound-absorbing panel of Comparative Example 1-1. [Figure 8] FIG. 8(a) is a schematic top cross-sectional view of the sound-absorbing panel of Comparative Example 1-2, and FIG. 8(b) is a schematic side view of the sound-absorbing panel of Comparative Example 1-2. [Figure 9] 1 is a graph showing the results of a sound absorbing performance test method for the sound absorbing panels of Example 1-1 and Comparative Examples 1-1 to 1-3. [Figure 10] 1 is a graph showing the results of a sound absorbing performance test method for the sound absorbing panels of Examples 2-1 to 2-6. [Figure 11]1 is a graph showing the results of a sound absorbing performance test method for the sound absorbing panels of Examples 3-1 to 3-3. [Figure 12] 1 is a graph showing the results of a sound absorbing performance test method for the sound absorbing structures of Examples 4-1 to 4-3. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The present invention will be described in more detail below with reference to embodiments.

[0010] [Sound absorbing panel] As shown in FIG. 1, a sound-absorbing panel 1 according to an embodiment of the present invention comprises a plurality of reflecting plates 20 arranged substantially parallel to one another, a support member 10 supporting the reflecting plates 20, and a sound-absorbing material 30 filling the space between the reflecting plates 20.

[0011] (reflector) The reflector 20 is inclined toward the traveling direction of the sound S emitted from the sound source 40, and is supported by the support surface 11 of the support member 10. The angle θ between the reflector 20 and the support surface 11 of the support member 10 is preferably 15° or more and 75° or less. When the angle θ between the reflector 20 and the support surface 11 of the support member 10 is 15° or more, the reflector 20 is more likely to receive noise from the horizontal direction, which is caused by a closed space as a sound source when a vehicle or the like is traveling, and the noise reduction performance can be improved. When the angle θ between the reflector 20 and the support surface 11 of the support member 10 is 75° or less, the noise from the horizontal direction, which is caused by a closed space as a sound source when a vehicle or the like is traveling, can be easily reflected between the reflectors 20 and attenuated, and the noise reduction performance can be improved. From the above viewpoint, the angle θ between the reflector 20 and the support surface 11 of the support member 10 is preferably 17° or more and 65° or less, more preferably 19° or more and 55° or less, and even more preferably 21° or more and 45° or less.

[0012] A single reflector 20 does not provide a sufficient sound absorbing effect, so multiple reflectors 20 are provided. Specifically, the reflectors 20 are inclined in the traveling direction of the sound S emitted from the sound source 40, and at least two adjacent reflectors 20 are generally parallel to each other. The reflecting plates 20 are arranged at an angle to the traveling direction of the sound S emitted from the sound source 40, so that at least two adjacent reflecting plates 20 are arranged substantially parallel to each other at a predetermined angle to the sound source 40. The other reflecting plates 20 may be arranged to intersect each other non-parallel while maintaining a predetermined angle. By providing a plurality of reflecting plates 20 substantially parallel to one another at a predetermined angle to the sound source 40, when the sound absorbing panel 1 is used in a soundproof wall, the direction of the multiple reflection parts of the noise that are multiple-reflected between the soundproof wall and a vehicle and leak outside the soundproof wall is changed, so that the noise is less likely to leak outside the soundproof wall, and the soundproofing effect is increased. In this specification, "approximately parallel" does not mean only parallel in the strict sense, but rather means allowing an angle that can change the direction of the multiple reflections of the noise. Usually, it is sufficient for adjacent reflectors to be within ±10° of each other.

[0013] The reflector 20 is not particularly limited as long as it is inclined in the traveling direction of the sound S emitted from the sound source 40 and can be supported by the support member 10 so that at least two adjacent plates are substantially parallel to each other. Examples of the supporting means include a means for cutting three sides of a single plate to obtain the desired size of the reflector 20, and bending the plate upright using the remaining side as a fulcrum. Examples of the supporting means include a means for supporting the reflector 20 on the support member 10 by a joining means such as an adhesive, a screw, a fitting member, or welding.

[0014] Thickness W of reflector 20 1 The thickness W of the reflector 20 is preferably 0.1 mm or more and 3.2 mm or less, more preferably 0.2 mm or more and 2.3 mm or less, and further preferably 0.3 mm or more and 1.6 mm or less. 1 By keeping the thickness within the above range, it is possible to maintain the sound reflection function while reducing the weight, thereby achieving both the effect of preventing sound from leaking to the outside and the effect of reducing the weight.

[0015] Height L of sound absorbing panel 1 in the vertical direction (Z-axis direction) 2 The height L of the reflector 20 in the vertical direction (Z-axis direction) 1Percentage of (L 1 / L 2 ) is preferably 0.80 or more, more preferably 0.83 or more, and even more preferably 0.85 or more. 2 Height L of reflector 20 1 Percentage of (L 1 / L 2 ) within the above range, noise from the horizontal direction can be efficiently reflected, and the sound absorbing effect can be improved.

[0016] The placement span of the reflector 20 is preferably 50 mm to 300 mm, more preferably 80 mm to 200 mm, and even more preferably 80 mm to 130 mm. By placing the reflector 20 within the above range, the sound reflection function can be maintained while the weight can be reduced, and both the effect of preventing sound from leaking outside and the effect of reducing weight can be achieved. In this specification, the arrangement span of the reflectors 20 refers to the distance between sides 21 of adjacent reflectors 20 fixed to the support member 10.

[0017] The surface density of the reflector 20 is 0.05 g / cm 2 More than 3.5g / cm 2 It is preferable that: When the surface density of the reflector 20 is equal to or greater than the lower limit, the amount of sound reflected is increased, making it difficult for sound to leak out. Also, when the surface density of the reflector 20 is equal to or less than the upper limit, the sound absorbing panel 1 can be made lighter.

[0018] The material of the reflector 20 may be a material having rigidity and durability, and examples of the material include metals such as iron, steel, and aluminum, resins such as polyethylene, polypropylene, and polybutene, and wooden plywood. Metals are preferable as the material of the reflector 20, and plated steel sheets such as highly corrosion-resistant plated steel sheets and hot-dip galvanized steel sheets are preferable. Specific examples of highly corrosion-resistant plated steel sheets include Superdyma steel sheets (registered trademark) and ZAM steel sheets (registered trademark). Metals are preferable as the material of the reflector 20, and aluminum sheets are preferable because they are rigid and lightweight. The reflector 20 may be coated with a coating or the like to improve corrosion resistance.

[0019] (Support member) The support member 10 has a support surface that supports one side 21 extending in the vertical direction (Z-axis direction) of the reflector 20. The support member 10 fixes the one side 21 extending in the vertical direction (Z-axis direction) of the reflector 20 to the support surface 11. The material of the support member 10 may be any material capable of fixing and holding one side 21 of the reflector 20 extending in the vertical direction (Z-axis direction), and examples of such materials include metals such as iron, steel, and aluminum, and resins such as polyethylene, polypropylene, and polybutene. From the viewpoint of durability, metals are preferred as the material of the support member 10, and among these, plated steel sheets such as highly corrosion-resistant plated steel sheets and hot-dip galvanized steel sheets are preferred. Specific examples of highly corrosion-resistant plated steel sheets include Superdyma steel sheets (registered trademark) and ZAM (registered trademark) steel sheets. Furthermore, the support member 10 and the reflector plate 20 do not have to be separate members fixed together, but may be an integrated member.

[0020] Thickness W of the support member 10 2 The thickness W of the support member 10 is preferably 0.1 mm or more and 3.2 mm or less, more preferably 0.2 mm or more and 2.3 mm or less, and even more preferably 0.3 mm or more and 1.6 mm or less. 2 By keeping the thickness within the above range, it is possible to obtain a lightweight structure while maintaining rigidity and durability.

[0021] <Case> 2, the support member 10 can be configured to be installed inside the hollow shape on an opposite surface 12B that faces a main sound incident surface 12A, among the main opposing surfaces of a hollow housing 12. The support member 10 has a reflector 20 and a sound absorbing material 30 installed inside the hollow shape. 3, the support member 10 can be configured to configure an opposite surface 12B that faces a main sound incident surface 12A among the main opposing surfaces of a hollow housing 12. Then, a reflector 20 and a sound absorbing material 30 are installed inside the hollow shape. The shape of the housing 12 is a hollow shape having an opposing entrance surface 12A and an opposite surface 12B, and while in Figures 2 and 3 it is a rectangular prism, this is not particularly limited and may be a cube, a cylinder, a regular tetrahedron, or any other shape other than these.

[0022] Of the surfaces constituting the housing 12, it is preferable that the entrance surface 12A and the opposite surface 12B are provided with a large number of through holes. By providing the entrance surface 12A constituting the housing 12 with a large number of through holes, the sound S emitted from the sound source 40 can be efficiently introduced into the housing 12, making it possible to improve the sound absorption effect of the sound S, and contributing to a reduction in the weight of the housing 12. In addition, by providing the opposite surface 12B constituting the housing 12 with a large number of through holes, it is possible to contribute to a reduction in the weight of the housing 12. Examples of the incident surface 12A and the opposite surface 12B having a large number of through holes include wire mesh, punched metal, and louvers. From the viewpoint of improving the sound absorbing effect and obtaining rigidity and durability, the incident surface 12A and the opposite surface 12B are preferably perforated plates such as punched metal having a large number of through holes. The shape of the through holes may be any of round holes, square holes, elongated holes, etc. The aperture ratio of the through holes in the incident surface 12A and the opposite surface 12B is preferably 20% or more and 70% or less, more preferably 35% or more and 65% or less, and even more preferably 40% or more and 60% or less. When the aperture ratio of the through holes in the incident surface 12A and the opposite surface 12B is within the above range, the rigidity and durability of the housing 12 can be maintained while efficiently absorbing noise from the sound source 40. The aperture ratio of the through holes in the surface constituting the housing 12 is the ratio of the area of ​​the through holes to the area of ​​the entire surface including the through holes excluding the surrounding frame portion when the surface constituting the housing 12 is viewed in plan.

[0023] The material of the housing 12 may be a material having rigidity and durability, and examples of the material include metals such as iron, steel, and aluminum, and resins such as polyethylene, polypropylene, and polybutene. From the viewpoint of durability, metals are preferred as the material of the housing 12, and among them, plated steel sheets such as highly corrosion-resistant plated steel sheets and hot-dip galvanized steel sheets are preferred. Specific examples of highly corrosion-resistant plated steel sheets include Superdyma steel sheets (registered trademark) and ZAM (registered trademark) steel sheets. The surfaces constituting the housing 12 may be painted or the like to improve corrosion resistance.

[0024] The thickness of the surface constituting the housing 12 is preferably 0.8 mm or more and 9.0 mm or less, more preferably 1.2 mm or more and 6.0 mm or less, and even more preferably 1.6 mm or more and 4.5 mm or less. By having the thickness of the surface constituting the housing 12 within the above range, it is possible to achieve rigidity and durability as well as weight reduction. As long as the thickness of the surfaces constituting the housing 12 is within the above range, the entire surface may have a uniform thickness, or each surface may have a different thickness.

[0025] (sound absorbing material) The sound absorbing material 30 fills the space between the reflecting plates 20. By filling the space between the reflecting plates 20 with the sound absorbing material 30, the sound S that is reflected multiple times between the reflecting plates 20 passes through the sound absorbing material 30 after each multiple reflection, and the amount of attenuation increases, thereby increasing the sound absorbing effect. In other words, the sound absorbing material 30 can remove (absorb) the multiple reflected sounds and direct reflected sounds inside the housing 12 that are generated by providing the reflecting plates 20, and the soundproofing effect can be further improved.

[0026] The thickness of the sound-absorbing material 30 in the normal direction (Y-axis direction) of the support surface 11 of the support member 10 is preferably 125 mm or less, more preferably 115 mm or less, and even more preferably 100 mm or less. Having a thickness of the sound-absorbing material 30 equal to or less than the above upper limit value contributes to reducing the weight of the sound-absorbing panel 1 while maintaining the sound-absorbing effect. Moreover, the thickness of the sound absorbing material 30 in the normal direction (Y-axis direction) of the support surface 11 of the support member 10 is preferably 25 mm or more, more preferably 40 mm or more, and even more preferably 50 mm or more. When the thickness of the sound absorbing material 30 is equal to or more than the above lower limit, the sound absorbing effect can be improved.

[0027] As shown in FIG. 4, the total thickness T 2 The reflector 20 exists in the area T 1 Proportion (T 1 / T 2 ) is preferably 0.90 or less, more preferably 0.85 or less, and even more preferably 0.80 or less. 2 The reflector 20 exists in the area T 1 By making the ratio equal to or less than the upper limit, when the sound is reflected by the reflecting plate 20 and exits from the surface 30A side of the sound absorbing material 30, the sound absorbing material 30 is present in the path of the sound, and the sound absorbing effect can be improved. 2 The reflector 20 exists in the area T 1 Proportion (T 1 / T2 ) is preferably 0.20 or more, more preferably 0.25 or more, and even more preferably 0.30 or more. 2 The area T of the reflector 20 1 When the ratio is equal to or greater than the lower limit, the sound can be reflected by the reflecting plate 20, and the sound absorbing effect of the reflecting plate 20 can be fully exhibited.

[0028] The material of the sound-absorbing material 30 is not particularly limited, and examples thereof include dry materials such as glass wool, rock wool, synthetic fibers, and metal fibers, and wet materials such as urethane foam and putty. The material of the sound-absorbing material 30 may be a dry material or a wet material used alone. Of the dry materials, those that deform when they absorb moisture, such as glass wool, are preferably water-repellent.

[0029] The density of the dry material of the sound absorbing material 30 is 16 kg / m 3 More than 64kg / m 3 It is preferable that the thickness is less than 20 kg / m 3 More than 48kg / m 3 More preferably, it is 24 kg / m or less. 3 More than 32kg / m 3 It is even more preferable that the density of the dry material of the sound-absorbing material 30 is within the above range, thereby making it possible to achieve both a good sound-absorbing effect and reduced manufacturing costs.

[0030] The density of the wet material of the sound absorbing material 30 is 20 kg / m 3 More than 100kg / m 3 It is preferable that the thickness is less than 25 kg / m 3 More than 80kg / m 3 More preferably, it is 30 kg / m or less. 3 More than 60kg / m 3 It is even more preferable that the density of the wet material of the sound-absorbing material 30 is within the above range, so that both the sound absorbing effect and the weight reduction of the sound-absorbing panel 1 can be achieved.

[0031] The sound absorbing material 30 is preferably covered independently by protective materials such as water repellent or waterproof cloth and film. By covering the sound absorbing material 30 with a protective material, water repellency or waterproofing can be imparted to the sound absorbing material 30, deformation due to moisture absorption can be prevented, and durability can be improved. In addition, by covering the sound absorbing material 30 with a protective material, scattering of the sound absorbing material 30 can be prevented, and the density and thickness of the sound absorbing material 30 can be easily controlled. Examples of protective materials include glass cloth, polyvinyl fluoride film, and fluoroethylene tetrafluoride film. The thickness of the protective material is not particularly limited as long as it can cover and hold the sound absorbing material 30, but is preferably about 0.01 to 1 mm. The glass cloth is not particularly limited, but in terms of the balance between sound absorption performance and shatterproof performance, it is preferable that the mesh density and thickness are in the range of EP12D equivalent to EP18B equivalent (JIS R 3414:2012).

[0032] [Sound absorbing structure] As shown in FIG. 5, a sound absorbing structure 2 according to an embodiment of the present invention is a sound absorbing structure in which the above-mentioned sound absorbing panel 1 is installed on an installation wall surface 50. The sound absorbing panel 1 is attached to the mounting wall 50 using mounting means 51 such as screws or bolts.

[0033] In the sound-absorbing structure 2, there is a gap D of 5 mm or more between the sound-absorbing panel 1 and the installation wall surface 50. If the gap D between the sound-absorbing panel 1 and the installation wall surface 50 is less than 5 mm, pressure waves are less likely to escape in the thickness direction (Y-axis direction) of the sound-absorbing panel 1, the load applied to the sound-absorbing panel 1 increases, and damage or the like is more likely to occur. If the gap between the sound-absorbing panel 1 and the installation wall surface 50 is 5 mm or more, an air layer is formed between the sound-absorbing panel 1 and the installation wall surface 50, and the sound-absorbing efficiency is improved. From the above viewpoint, the gap D between the sound-absorbing panel 1 and the installation wall surface 50 is preferably 6 mm or more, more preferably 7 mm or more, and even more preferably 8 mm or more. In addition, the larger the gap D between the sound-absorbing panel 1 and the installation wall surface 50, the more the load applied to the installation means 51 increases, making damage or the like more likely to occur, and the thickness increases on the inside of the track, so that it is preferably 70 mm or less, more preferably 60 mm or less, and even more preferably 50 mm or less.

[0034] The sound-absorbing structure 2 employs a wall surface near the exit of a tunnel for expressways or railway vehicles, near the entrance of a hood-type railway station, etc. as the installation wall surface 50, and installs the sound-absorbing panel 1. The reflecting plate 20 of the sound-absorbing panel 1 is arranged so as to be inclined in the traveling direction of sound S emitted from a sound source 40 such as a tunnel, which is a noise source, thereby reflecting the sound back to the sound source 40 such as a tunnel.

[0035] As an example of the sound-absorbing structure 2, as shown in FIG. 6, a sound-absorbing panel 1 is installed on a mounting wall surface 50 near the entrance of a hood-type railway station building adjacent to a tunnel 56. The hood-type railway station building has a platform 53 along a track 54, and a vehicle 57 travels through a nearby tunnel 56. In the hood-type railway station building, an opening 55 is provided near the platform 53 so that the vehicle 57 parked on the platform 53 can be visually confirmed from the outside. Every time the vehicle 57 travels to or from the platform 53, the vehicle 57 travels through the tunnel 56, and noise originating from the tunnel 56, which is a closed space, spreads to the outside through the platform 53 and the opening 55. Therefore, as shown in FIG. 6, a reflecting plate of the sound-absorbing structure 2 is provided near the exit of the tunnel 56 so as to be inclined in the traveling direction of the sound emitted from the tunnel 56, which is the sound source. By arranging the sound-absorbing structure 2 in this manner, noise from the horizontal direction with the tunnel 56 as the sound source can be absorbed or reflected into the inside of the tunnel 56, making it possible to prevent the noise from spreading to the outside through the platform 53 and opening 55.

[0036] According to the sound-absorbing panel and sound-absorbing structure of the embodiment of the present invention, the reflecting plate is inclined toward the traveling direction of the horizontal sound emitted from the sound source, thereby improving the sound-absorbing effect against noise from the horizontal direction. Also, according to the sound-absorbing panel and sound-absorbing structure of the embodiment of the present invention, the number of internal reflections of the sound between the reflecting plates is increased, thereby improving the sound-absorbing effect. EXAMPLES

[0037] The present invention will be described in more detail below using examples, but the present invention is not limited to these examples. The sound absorbing structure of the present invention is evaluated as follows.

[0038] <Evaluation method> The test method for Examples 1 to 3 was based on the sound absorption performance test method (oblique incidence sound absorption coefficient method) stipulated in the publicly solicited project "Development of a sound absorbing plate with a large noise reduction effect" of the Construction Technology Evaluation System (Ministry of Land, Infrastructure, Transport and Tourism) in 1995. For Example 4, the test was based on JIS A 1409.

[0039] [Example 1-1] [Sound absorbing panel] As a sound absorbing panel of the embodiment 1, a sound absorbing panel was prepared in which the reflector was inclined in the direction of sound travelling from the sound source and the angle between the reflector and the horizontal direction of the support surface of the support member was 23° as shown in Fig. 1. The space between the reflectors was filled with a sound absorbing material. The evaluation results of this sound absorbing panel are shown in the graph of Fig. 9. (reflector) Material: Zinc-based alloy plated steel sheet, manufactured by Nippon Steel Nisshin Steel Co., Ltd., product name "ZAM (registered trademark) steel sheet" Thickness: 0.4mm The ratio of the height of the reflector to the height of the sound absorbing panel (L 1 / L 2 ):0.86 - Placement span: 118mm (Support member) Material: Zinc-based alloy plated steel sheet, manufactured by Nippon Steel Nisshin Steel Co., Ltd., product name "ZAM (registered trademark) steel sheet" Thickness: 0.4mm (sound absorbing material) Material: Glass wool, manufactured by Mag-Isobel Co., Ltd. ·Density: 32kg / m 3 Thickness: 50mm

[0040] [Comparative Example 1-1] As a reflection plate pattern B of the sound-absorbing panel according to Comparative Example 1-1, as shown in Fig. 7, a sound-absorbing panel was prepared in which the reflection plate was inclined toward the sound source side from which the sound was emitted, and the angle between the reflection plate and the support surface of the support member in the horizontal direction was 23°. The space between the reflection plates was filled with a sound-absorbing material. The evaluation results of this sound-absorbing panel are shown in the graph of Fig. 9. The materials of the members used in the sound-absorbing panel were the same as those in Example 1-1.

[0041] [Comparative Example 1-2] As a reflection plate pattern C of the sound-absorbing panel according to Comparative Example 1-2, as shown in Fig. 8, a sound-absorbing panel was prepared in which the reflection plate was inclined in a vertical direction with respect to the traveling direction of the sound emitted from the sound source, and the angle between the reflection plate and the vertical direction and the support surface of the support member was 23°. The space between the reflection plates was filled with a sound-absorbing material. The evaluation results of this sound-absorbing panel are shown in the graph of Fig. 9. The materials of the members used in the sound-absorbing panel were the same as those in Example 1-1.

[0042] [Comparative Example 1-3] As Comparative Example 1-3, a sound-absorbing panel was obtained in the same manner as in Example 1-1, except that the reflector was omitted. The evaluation results of this sound-absorbing panel are shown in the graph of Figure 9. The materials of the members used in the sound-absorbing panel were the same as those in Example 1.

[0043] In Example 1-1, the reflecting plate was inclined toward the traveling direction of the sound emitted from the sound source, and thus an excellent sound absorbing effect was achieved against noise from the horizontal direction in the low frequency range. In contrast to this, in Comparative Examples 1-1 to 1-3, the soundproofing effect was poor in the low frequency range.

[0044] [Example 2-1] As Example 2-1, a sound-absorbing panel was obtained in the same manner as in Example 1-1, except that the angle between the support member and the support surface in the horizontal direction was changed to 10°. The evaluation results of this sound-absorbing panel are shown in the graph in Figure 10. The materials of the members used in the sound-absorbing panel were the same as those in Example 1.

[0045] [Example 2-2] As Example 2-2, a sound-absorbing panel was obtained in the same manner as in Example 1-1, except that the angle between the support member and the support surface in the horizontal direction was changed to 15°. The evaluation results of this sound-absorbing panel are shown in the graph in Figure 10. The materials of the members used in the sound-absorbing panel were the same as those in Example 1.

[0046] [Example 2-3] As Example 2-3, a sound-absorbing panel was obtained with an angle of 13° between the support surface of the support member and the horizontal direction, similar to Example 1-1. The evaluation results of this sound-absorbing panel are shown in the graph of Figure 10. The material of the member used for the sound-absorbing panel was the same as that of Example 1.

[0047] [Example 2-4] As Example 2-4, a sound-absorbing panel was obtained in the same manner as in Example 1-1, except that the angle between the support member and the support surface in the horizontal direction was changed to 45°. The evaluation results of this sound-absorbing panel are shown in the graph in Figure 10. The materials of the members used in the sound-absorbing panel were the same as those in Example 1.

[0048] [Example 2-5] As Example 2-5, a sound-absorbing panel was obtained in the same manner as in Example 1-1, except that the angle between the support member and the support surface in the horizontal direction was changed to 75°. The evaluation results of this sound-absorbing panel are shown in the graph in Figure 10. The materials of the members used in the sound-absorbing panel were the same as those in Example 1.

[0049] [Example 2-6] As Example 2-6, a sound-absorbing panel was obtained in the same manner as in Example 1-1, except that the angle between the support member and the support surface in the horizontal direction was changed to 90°. The evaluation results of this sound-absorbing panel are shown in the graph in Figure 10. The materials of the members used in the sound-absorbing panel were the same as those in Example 1.

[0050] Examples 2-1 to 2-6 exhibited excellent sound absorbing effects. Among them, Examples 2-2 to 2-5 exhibited particularly excellent sound absorbing effects because the average oblique incidence sound absorption coefficient in the range of 125 to 4,000 Hz exceeded 0.8.

[0051] [Example 3-1] As Example 3-1, a sound-absorbing panel was obtained in the same manner as in Example 1-1, except that the thickness of the sound-absorbing material was changed to 100 mm. The evaluation results of this sound-absorbing panel are shown in the graph in Figure 11. The materials used for the sound-absorbing panel were the same as those in Example 1.

[0052] [Example 3-2] As Example 3-2, a sound-absorbing panel was obtained in the same manner as in Example 1-1, except that the thickness of the sound-absorbing material was changed to 125 mm. The evaluation results of this sound-absorbing panel are shown in the graph in Figure 11. The materials used for the sound-absorbing panel were the same as those in Example 1.

[0053] [Example 3-3] As Example 3-3, a sound-absorbing panel was obtained in the same manner as in Example 1-1, except that the thickness of the sound-absorbing material was changed to 150 mm. The evaluation results of this sound-absorbing panel are shown in the graph in Figure 11. The materials used for the sound-absorbing panel were the same as those in Example 1.

[0054] Examples 3-1 to 3-3 exhibited a better sound absorbing effect than Example 1-1, in which the sound absorbing material had a thickness of 50 mm. However, when the thickness of the sound absorbing material exceeded 125 mm, the sound absorption rate was hardly improved, and therefore, in consideration of weight reduction and cost, it was found that the thickness of the sound absorbing material is preferably 125 mm or less.

[0055] [Example 4-1] As the sound absorbing structure according to Example 4-1, the sound absorbing panel obtained in Example 1-1 was arranged so as to form a gap of 10 mm between the panel and the wall on which it was placed. The evaluation result of the sound absorption coefficient of this sound absorbing structure obtained by the reverberation room sound absorption coefficient method is shown in the graph of FIG.

[0056] [Example 4-2] As the sound absorbing structure according to Example 4-2, the sound absorbing panel obtained in Example 1-1 was arranged so as to form a gap of 30 mm between the panel and the wall on which it was placed. The evaluation results of the sound absorption coefficient of this sound absorbing structure obtained by the reverberation room sound absorption coefficient method are shown in the graph of FIG.

[0057] [Example 4-3] As the sound absorbing structure according to Example 4-3, the sound absorbing panel obtained in Example 1-1 was arranged so as to form a gap of 50 mm between the panel and the wall on which it was placed. The evaluation result of the sound absorption coefficient of this sound absorbing structure obtained by the reverberation room sound absorption coefficient method is shown in the graph of FIG.

[0058] In Examples 4-1 to 4-3, it was found that forming a gap between the sound-absorbing panel and the wall surface on which the panel is installed creates an air layer, improving the sound absorption coefficient. It was also found that the larger the gap between the sound-absorbing panel and the wall surface on which the panel is installed, the more the sound absorption coefficient improves. [Explanation of symbols]

[0059] 1. Sound absorbing panels 10 Support member 11 Support surface 12. Cabinet 12A entrance surface 12B opposite side 20 Reflector 21 Side 30 Sound absorbing material 40 Sound Sources 50 Installation wall 51 Installation means 53 Platform 54 Railroad 55 Opening 56 Tunnel 57 Vehicles

Claims

1. A sound-absorbing panel to be installed in a location where noise from a horizontal direction originating from an enclosed space as a vehicle or the like travels is predominant, a plurality of vertically extending reflectors arranged substantially parallel to one another; A support member for supporting the reflector; A sound absorbing material that fills the space between the reflectors, The sound-absorbing panel is inclined in the direction of travel of sound that is generated from the horizontal direction with the closed space as a sound source due to the movement of a vehicle or the like.

2. The sound-absorbing panel according to claim 1 , wherein the support member has a support surface that supports one side of the reflector plate that extends in the vertical direction.

3. The sound-absorbing panel according to claim 2 , wherein an angle between the reflecting plate and the support surface of the support member is equal to or greater than 15° and equal to or less than 75°.

4. 4. The sound-absorbing panel according to claim 2, wherein a ratio of an area where the reflection plate is present to a total thickness of the sound-absorbing material in a normal direction of the support surface of the support member is 0.90 or less.

5. The sound-absorbing panel according to any one of claims 1 to 4, wherein the thickness of the reflector is 0.1 mm or more and 3.2 mm or less.

6. The sound-absorbing panel according to any one of claims 2 to 4, wherein the thickness of the sound-absorbing material in the normal direction of the support surface of the support member is 125 mm or less.

7. The sound-absorbing panel according to any one of claims 1 to 6, wherein the support member is installed inside the hollow shape on an opposite surface of the main opposing surfaces of the hollow housing that faces a main sound incident surface.

8. The sound-absorbing panel according to any one of claims 1 to 7, wherein the support member constitutes an opposite surface of a hollow housing that faces a main sound incidence surface, out of the main opposing surfaces of the housing.

9. The sound-absorbing panel according to claim 7 or 8, wherein the housing has a hollow shape inside which the reflecting plate and the sound-absorbing material are disposed.

10. The sound-absorbing panel according to any one of claims 7 to 9, wherein the entrance surface and the opposite surface among the surfaces constituting the housing are provided with a large number of through holes.

11. A sound absorbing structure in which the sound absorbing panel according to any one of claims 1 to 10 is installed on an installation wall surface, A sound-absorbing structure in which there is a gap of 5 mm or more between the sound-absorbing panel and the installation wall surface.

Images