Acoustic material

Abstract

To provide an acoustic material advantageous in securing of flexural rigidity, durability, and acoustic performance.SOLUTION: An acoustic material 10A includes: a tabular acoustic material body 12 formed of an acoustic material having predetermined acoustic performance; and a reinforcing plate 14 formed of a material having higher rigidity than the acoustic material body 12. The reinforcing plate 14 has a plurality of through holes 18 penetrating in a direction of thickness T2 of the reinforcing plate 14. An outer periphery part 1210 of the acoustic material body 12, which is positioned outside the reinforcing plate 14, and an inner periphery part 1212 positioned inside the reinforcing plate 14 are joined together with parts 1214 of the acoustic material part 12, which are positioned in the plurality of through holes 18. The outer periphery part 1210 of the acoustic material body 12, the inner periphery part 1212 positioned inside the reinforcing plate 14, and the reinforcing plate 14 are integrated with together, that is, the acoustic material body 12 and the reinforcing plate 14 are integrated with together.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to acoustic materials. [Background technology]

[0002] Acoustic materials have been provided that can be attached to structures such as the hull of a ship to reflect, absorb, and transmit sound waves (see Patent Document 1). One such acoustic material is a rectangular plate made of a viscoelastic material of uniform thickness, which is attached by overlapping it on the outer surface of the steel plate that constitutes the structure. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-227702 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in recent years, there has been a demand for thinner steel plates constituting structures in order to reduce the weight of the structures. However, thinner steel plates are disadvantageous in terms of ensuring the strength of the structures. Therefore, it is possible to incorporate a reinforcing layer made of FRP, synthetic resin, or metal material inside the acoustic material to give the acoustic material bending rigidity, and to incorporate the acoustic material itself as a structural member (reinforcing member) into the structural design of the structure. In other words, by using the acoustic material itself as a structural component that constitutes a structure such as a hull, the strength of the entire structure consisting of the structure and the acoustic material can be ensured even if the steel plates of the structure are made thin. In this case, however, it is not easy to integrate the reinforcing layer with the acoustic material, which is disadvantageous in terms of increasing the durability of the acoustic material. The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide an acoustic material that is advantageous in ensuring bending rigidity, durability, and acoustic performance. [Means for solving the problem]

[0005] In order to achieve the above-mentioned object, one embodiment of the present invention comprises a plate-shaped acoustic material body having a thickness formed from an acoustic material having a predetermined acoustic performance, and a reinforcing plate formed from a material having higher rigidity than the acoustic material body, having a thickness, a height that is greater than the thickness, and a length that is greater than the height, and is embedded in the acoustic material body, and is characterized in that the reinforcing plate has a through hole that penetrates in the thickness direction of the reinforcing plate. Effect of the Invention

[0006] According to one embodiment of the present invention, the reinforcing plate is advantageous in ensuring the bending rigidity of the acoustic material. In addition, since the acoustic material body and the reinforcing plate are integrated via a plurality of through holes that penetrate the reinforcing plate in the thickness direction, this is advantageous in terms of increasing the durability of the acoustic material. In this case, the acoustic material can be manufactured without using an adhesive whose material or physical properties are different from those of the acoustic material itself, which is advantageous in ensuring acoustic performance. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a plan view of the acoustic material of the first embodiment. [Diagram 2] FIG. 1 is a perspective view of an acoustic material according to a first embodiment. [Diagram 3] 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 4] FIG. [Diagram 5] FIG. 11 is a perspective view of an acoustic material according to a second embodiment. [Figure 6] 6 is a cross-sectional view taken along line BB in FIG. 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] (First embodiment) Next, an acoustic material 10A according to a first embodiment will be described with reference to FIGS. The acoustic material 10A is attached by overlapping it on the outer surface (attachment surface) of a steel plate that constitutes a structure (not shown) such as the hull of a ship, thereby reflecting, absorbing, and transmitting sound waves. The acoustic material 10A includes an acoustic material body 12 and a reinforcing plate 14. The acoustic material body 12 is formed from an acoustic material having predetermined acoustic performance (sound insulation, sound absorption, and transparency), and in this embodiment, a viscoelastic body is used as the acoustic material. As the viscoelastic body, various conventionally known viscoelastic bodies such as rubber and synthetic resins such as urethane can be used. As shown in Figs. 1 and 2, the acoustic material body 12 is formed in the shape of a rectangular plate having a uniform thickness T1, a uniform width W1 that is greater than the thickness T1, and a uniform length L1. In this embodiment, it is formed into a square plate with equal width W1 and length L1, and mounting holes 16 are formed through the four corners 1202 of the acoustic material main body 12 for attaching the acoustic material 10A to a structure such as a ship's hull. The acoustic material 10A is attached to the structure by bolts inserted through the mounting holes 16.

[0009] The reinforcing plate 14 is formed from a material having higher rigidity than the acoustic material body 12 and is embedded in the acoustic material body 12. The reinforcing plate 14 can be made of various conventionally known materials such as FRP (fiber reinforced plastic), synthetic resin, and metal. Using a material such as FRP, which has acoustic performance similar to that of the acoustic material (viscoelastic material), in other words, a material with an acoustic impedance similar to that of the acoustic material, as the reinforcing plate 14 is advantageous in ensuring the acoustic performance of the acoustic material 10A, and in this embodiment, FRP is used as the reinforcing plate 14. As shown in Figures 3 and 4, the reinforcing plate 14 is an elongated, plate-like, annular shape having a uniform thickness T2, a uniform height H2 that is greater than the thickness T2, and a uniform length L2 (not shown) that is greater than the height H2. The reinforcing fibers constituting the reinforcing plate 14 are embedded inside the reinforcing plate 14 so as to be parallel to both sides of the reinforcing plate 14 in the thickness T1 direction. As shown in FIGS. 1 and 3, the center of the circular ring that defines the contour of the reinforcing plate 14 and the center of the acoustic material body 12 coincide with each other. As shown in FIG. 3, the height H2 of the reinforcing plate 14 is formed to be the same dimension as the thickness T1 of the acoustic material body 12. The reinforcing plate 14 is arranged with its height H2 direction aligned with the thickness T1 direction of the acoustic material main body 12, and both ends of the reinforcing plate 14 in the height H2 direction are located on the same plane as both sides of the acoustic material main body 12 in the thickness T1 direction. As shown in FIG. 4, the reinforcing plate 14 is provided with a plurality of through holes 18 penetrating the reinforcing plate 14 in the thickness T2 direction at equal intervals in the length L2 direction of the reinforcing plate 14. The plurality of through holes 18 are all provided with the same inner diameter, and the centers of the through holes 18 are positioned at the center of the reinforcing plate 14 in the height H2 direction. Therefore, as shown in Figure 3, an outer peripheral portion 1210 of the acoustic material main body 12 located on the outside of the reinforcing plate 14 and an inner peripheral portion 1212 located on the inside of the reinforcing plate 14 are connected by a portion 1214 of the acoustic material main body 12 located within the multiple through holes 18. In addition, when acoustic material 10A is manufactured using an acoustic material in a raw rubber state before vulcanization, the surface of reinforcing plate 14 is adhered to acoustic material main body 12 with a certain degree of adhesive strength during vulcanization, and when acoustic material 10A is manufactured using an acoustic material such as highly fluid urethane, the surface of reinforcing plate 14 is adhered to acoustic material main body 12 with a certain degree of adhesive strength when the acoustic material hardens. Furthermore, when manufacturing acoustic material 10A, if an acoustic material in a raw rubber state is used, the acoustic material will expand, foam, and flow during vulcanization, flowing into through hole 18, and if highly fluid urethane is used as the acoustic material, the acoustic material will flow into through hole 18, filling through hole 18 with the acoustic material.

[0010] Next, the effects will be described. The acoustic material 10A of this embodiment comprises a plate-shaped acoustic material main body 12 formed from an acoustic material having predetermined acoustic performance, and a reinforcing plate 14 formed from a material having higher rigidity than the acoustic material main body 12. Therefore, the reinforcing plate 14 is advantageous in ensuring the bending rigidity of the acoustic material 10A, and is advantageous in suppressing the amount of deformation and displacement (distortion) of the acoustic material 10A when pressure is applied to the acoustic material 10A. Therefore, by using the acoustic material 10A itself as a structural component that constitutes a structure such as the hull, it is advantageous for ensuring the strength of the entire structure consisting of the structure and the acoustic material 10A even if the steel plates of the structure are made thin, which is advantageous for achieving both weight reduction of the structure and ensuring the acoustic performance of the acoustic material 10A. Further, the reinforcing plate 14 is provided with a plurality of through holes 18 penetrating the reinforcing plate 14 in the thickness T2 direction. Therefore, the outer peripheral portion 1210 of the acoustic material main body 12 located on the outside of the reinforcing plate 14 and the inner peripheral portion 1212 located on the inside of the reinforcing plate 14 are connected by portions 1214 of the acoustic material main body 12 located within the multiple through holes 18, and the outer peripheral portion 1210 of the acoustic material main body 12, the inner peripheral portion 1212 located on the inside of the reinforcing plate 14, and the reinforcing plate 14 are integrated, i.e., the acoustic material main body 12 and the reinforcing plate 14 are integrated. This is advantageous in terms of increasing the durability of the acoustic material 10A, and since the acoustic material 10A can be manufactured without using foreign materials such as adhesives, this is advantageous in terms of efficiently manufacturing the acoustic material 10A with excellent acoustic performance.

[0011] In the present invention, the shape of the reinforcing plate 14 is not limited to the circular ring shape of the embodiment, but various conventionally known shapes can be adopted, and depending on the shape, the number of through-holes 18 may be one. However, providing a plurality of through holes 18 as in this embodiment ensures that the acoustic material body 12 and the reinforcing plate 14 are integrated together more reliably, which is more advantageous in terms of increasing the durability of the acoustic material 10A.

[0012] In this embodiment, the reinforcing plate 14 is disposed so that the height H2 direction of the reinforcing plate 14 is aligned with the thickness T1 direction of the acoustic material body 12. Therefore, when viewed from the direction from which the sound waves arrive, the area of ​​the reinforcing plate 14 occupies a very small proportion of the area of ​​the acoustic material main body 12, so that even though the reinforcing plate 14 is made of a material different from that of the acoustic material main body 12, the impact on the acoustic performance of the acoustic material 10A is minimal. This is therefore advantageous in ensuring both the bending rigidity and acoustic performance of the acoustic material 10A.

[0013] In this embodiment, both ends of the reinforcing plate 14 in the height H2 direction are located on the same plane as both sides of the acoustic material body 12 in the thickness T1 direction. Therefore, a large section modulus can be ensured for the reinforcing plate 14, which is advantageous in terms of ensuring bending rigidity of the acoustic material 10A.

[0014] Although a metal material may be used as the reinforcing plate 14, if the reinforcing plate 14 is formed from a material whose acoustic performance is similar to that of the acoustic material, as in this embodiment, the effect of the reinforcing plate 14 on the acoustic performance can be suppressed, which is advantageous in ensuring the acoustic performance of the acoustic material 10A. Furthermore, when a viscoelastic material is used as the acoustic material and the reinforcing plate 14 is formed of FRP, as in this embodiment, the acoustic performance of the acoustic material and that of FRP are closer, which is more advantageous in suppressing the effect of the reinforcing plate 14 on the acoustic performance and ensuring the acoustic performance of the acoustic material 10A.

[0015] (Second embodiment) Next, a second embodiment will be described with reference to FIGS. In the following embodiment, the same parts and members as those in the first embodiment are denoted by the same reference numerals, and the following description will focus on the differences from the first embodiment. The second embodiment of the acoustic material 10B differs from the first embodiment in that both ends of the reinforcing plate 14 in the height H2 direction are located away from both sides of the acoustic material main body 12 in the thickness T1 direction. Therefore, in the second embodiment, the height H2 of the reinforcing plate 14 is smaller than that in the first embodiment, the section modulus of the reinforcing plate 14 is smaller, and the bending rigidity of the reinforcing plate 14 is slightly lower than that in the first embodiment.

[0016] On the other hand, in the second embodiment, at both ends of the reinforcing plate 14 in the height H2 direction, points 1216 located at both ends of the acoustic material body 12 in the thickness T1 direction are located over the entire length of the reinforcing plate 14 in the length L2 direction. Therefore, the outer peripheral portion 1210 of the acoustic material body 12 located on the outside of the reinforcing plate 14 and the inner peripheral portion 1212 located on the inside of the reinforcing plate 14 are connected by portions 1214 of the acoustic material body 12 located within the multiple through holes 18 and portions 1216 located at both ends of the acoustic material body 12 in the thickness T1 direction. Therefore, in the second embodiment, the acoustic material body 12 and the reinforcing plate 14 are more firmly integrated than in the first embodiment, which is advantageous in terms of increasing the durability of the acoustic material 10B.

[0017] In this embodiment, the acoustic material body 12 is formed in the shape of a rectangular plate, but the shape of the acoustic material body 12 may be any shape that allows it to be arranged without gaps on the outer surface of the structure, and various conventional structures such as a parallelogram, trapezoid, or regular hexagon can be adopted. In addition, in this embodiment, the case has been described where the reinforcing plate 14 is arranged so that the height H2 direction of the reinforcing plate 14 is aligned with the thickness T1 direction of the acoustic material main body 12; that is, the case has been described where the height H2 direction of the reinforcing plate 14 is parallel to the thickness T1 direction of the acoustic material main body 12; however, depending on the arrangement structure and shape of the reinforcing plate 14, there may be cases where the height H2 direction of the reinforcing plate 14 is not parallel to the thickness T1 direction of the acoustic material main body 12; therefore, the relationship between the height H2 direction of the reinforcing plate 14 and the thickness T1 direction of the acoustic material main body 12 is not limited to the embodiment. [Explanation of symbols]

[0018] 10A, 10B acoustic material 12 Acoustic material body 1202 Corner 1210 Outer periphery 1212 Inner circumference part 1214 A portion of the acoustic body 12 located within the through hole 18 1216 Points located at both ends of the acoustic material body 12 in the thickness T1 direction 14 Reinforcement plate 16 Mounting holes 18 Through hole T1 Thickness of Acoustic Material Body W1 Width of acoustic material body L1 Length of the acoustic material body T2 Thickness of the reinforcing plate H2 Height of the reinforcing plate L2 Length of the reinforcing plate

Claims

1. A plate-shaped acoustic material body having a thickness and formed of an acoustic material having a predetermined acoustic performance; A reinforcing plate is formed of a material having a higher rigidity than the acoustic material body, has a thickness, a height that is greater than the thickness, and a length that is greater than the height, and is embedded in the acoustic material body; The reinforcing plate is provided with a through hole penetrating the reinforcing plate in a thickness direction. An acoustic plate characterized by:

2. The through holes are provided at intervals in the longitudinal direction of the reinforcing plate.

2. The acoustic plate according to claim 1.

3. The reinforcing plate is arranged such that the height direction of the reinforcing plate is aligned with the thickness direction of the acoustic material body.

3. The acoustic plate according to claim 1 or 2.

4. Both ends of the reinforcing plate in the height direction are located on the same plane as both sides of the acoustic material body in the thickness direction.

4. The acoustic plate according to claim 3.

5. Both ends of the reinforcing plate in the height direction are located away from both sides of the acoustic material body in the thickness direction.

4. The acoustic plate according to claim 3.

6. The reinforcing plate is formed of a material having acoustic properties similar to those of the acoustic material forming the acoustic body.

2. The acoustic material according to claim 1.

7. The acoustic material forming the acoustic body is a viscoelastic material, The reinforcing plate is made of FRP.

7. The acoustic material according to claim 6.

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