JP2001278039A - Soundproof structure of structure using sandwich panel - Google Patents

Abstract

(57) [Summary] [Problem] A sandwich in which construction work is easy and does not require labor, manufacturing cost can be reduced, the overall weight can be reduced, and the interior space of the car can be increased as much as possible. To provide a soundproof structure of a structure using a panel. SOLUTION: A structure 22 is constituted by using a sandwich panel 29 provided with a core 28 having a large number of gaps between two face plates 25 and 26, and a lightweight and highly rigid structure can be obtained. In the vicinity of the connecting portion 24 of the structure 22, the vibration damping material 27 is provided between the two face plates, and it is possible to suppress the portion of each face plate near the connecting portion from vibrating. Therefore, even if vibration is transmitted from the underframe 23 to the structure 22, each face plate 2
The vibration of each of the face plates 25 and 26 can be prevented from being a source of noise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof structure such as a structure connected to a structure such as an underframe.

[0002]

2. Description of the Related Art FIG.
FIG. The vehicle body 2 of the railway vehicle is configured by connecting a structure 4 to an underframe 3, and a driver's cab and the like are formed in the vehicle body 2. In order to reduce the weight of the vehicle body 2 and increase its rigidity, the structure 4 is formed by a sandwich panel in which a core 7 made of a foamed synthetic resin is provided between two face plates 5 and 6 made of a fiber-reinforced synthetic resin material. It is configured. This not only significantly reduces the number of manufacturing steps, but also preserves the appearance. The structure 4 has a connecting portion 8 formed integrally with the face plates 5 and 6, and the structure 4 is connected to the structure 4 via a connecting fitting 9 fixed to the underframe 3. It is connected to the underframe 3.

[0003] The vehicle body 2 is provided on a bogie such that a frame 3 is connected to a bogie (not shown). Therefore, vibrations accompanying the traveling of the vehicle are transmitted from the bogie via the underframe 3 to the structure 4 constituting the vehicle body 2. Specifically, the vibration transmitted to the underframe 3 is transmitted from the connecting portion 8 to each of the face plates 5 and 6. When the vibration is transmitted in this way and the face plate 5 inside the vehicle among the face plates 5 and 6 vibrates, the air inside the vehicle is vibrated and the noise inside the vehicle is generated. In order to reduce such in-vehicle noise, a sponge-like sound absorbing material 1 is provided on the inner surface of the face plate 5.
0 is attached to reduce the noise inside the vehicle.

FIG. 5 shows another prior art soundproof panel 11.
FIG. This soundproof panel 11 is disclosed in
307066. The soundproof panel 11 is
A viscoelastic resin layer 13 is inserted between two aluminum flat plates 12a and 12b, and an aluminum foam material 15 is attached to a sandwich vibration damping plate 14 integrally formed. Has an aluminum flat plate 16 attached to the opposite side. This soundproof panel 11 is provided with a sandwich damping plate 14 disposed on the sound source side, and suppresses bending vibration of the aluminum plate 12b closest to the sound source due to transmission of air vibration from the sound source.
The noise is reduced by the effect of the sandwich damping plate 14 including the viscoelastic resin layer 13, and the sound radiated to the side away from the sound source can be absorbed and reduced by the aluminum foam material 15.

[0005]

SUMMARY OF THE INVENTION Such a soundproof structure 1
Then, after connecting the structures 4, the sound-absorbing material 10 must be stuck, and the construction work for realizing the soundproof structure 1 requires time and effort. In addition, the sound-absorbing material 10 is stuck to the curved structure 4. And construction work is difficult. Further, if the sound absorbing material 10 is exposed, the appearance of the sound absorbing material 10 is deteriorated. Therefore, the surface material 11 must be further provided inside the vehicle of the sound absorbing material 10, and further work is required for the construction work. Further, by providing the sound absorbing material 10 and the surface material 11 in this way, the space inside the vehicle is reduced. Furthermore, unless the sound absorbing material 10 is applied over the entire surface area on the vehicle interior space side, the effect of reducing vehicle interior noise cannot be achieved. Therefore, it is necessary to provide the sound absorbing material 10 over the entire surface of the structure 4 on the vehicle interior space side. Not only does the labor of the construction work increase, but also the manufacturing cost increases, and the weight of the vehicle body also increases.

The soundproof panel 11 of JP-A-6-307066 has a uniform structure over the entire area of the panel for the purpose of emitting sound from a sound source on one side in the thickness direction of the panel. Therefore, three aluminum flat plates 12a, 112b, and 16 are provided in the entire region of the panel, and the viscoelastic resin layer 13 and the aluminum foam material 15 are provided over the entire region between these aluminum flat plates, so that the total weight is reduced. Becomes large.

SUMMARY OF THE INVENTION An object of the present invention is to provide a soundproof structure for a structure using a sandwich panel, which can be easily and easily performed, does not require labor, can reduce manufacturing costs, and can reduce the overall weight. is there.

It is another object of the present invention to provide a soundproof structure for a structure using a sandwich panel which can make the interior space of a vehicle as large as possible.

[0009]

According to the present invention, there is provided a soundproof structure of a structure connected to a predetermined structure by a connecting portion,
Between two face plates made of a fiber reinforced synthetic resin material, a vibration damping material is provided near the connection portion, and a core having a large number of voids is provided in a region excluding the vicinity of the connection portion. The soundproof structure of the existing structure.

According to the present invention, the structure connected to the structure is formed using a sandwich panel in which a core having a large number of voids is provided between two face plates made of a fiber-reinforced synthetic resin material, and is lightweight and lightweight. A highly rigid structure can be obtained. In the vicinity of the connecting portion connected to the structure of this structure, a vibration damping material is provided between the two face plates, and it is possible to suppress vibration of the portion near the connecting portion of each face plate. Accordingly, it is possible to prevent the vibration from being transmitted from the connecting portion to the portion of the area excluding the vicinity of the connecting portion of each face plate via the portion near the connecting portion of each face plate. Therefore, even if vibration is transmitted from the structure to the structure, the vibration is transmitted only to the vicinity of the connecting portion, and in a large area of the structure, the vibration of each face plate becomes small, and the vibration of each face plate becomes a noise source. Can be prevented.

As described above, the soundproof structure is provided by providing the damping material inside the sandwich panel for forming the structure to prevent the generation of noise. Therefore, the soundproof structure can be realized only by connecting the structure to the structure. . Therefore, the construction work does not require a difficult and troublesome work such as separately providing a sound absorbing material, and can be performed easily and with less trouble.
Also, the damping material may be provided between the face plates in the same manner as the core, and the manufacturing of the structure is almost the same as the operation of manufacturing a structure using a panel without the damping material, and the structure is easily manufactured. And the manufacturing cost can be reduced. Further, since it is not necessary to provide a separate member, the overall weight can be reduced. Also, in the present invention, the predetermined structure is an underframe constituting a vehicle body of a railway vehicle, and the structure is an underframe. , And a structure that forms a vehicle body together with the underframe.

According to the present invention, a portion of the structure excluding the vicinity of the connecting portion of the face plate facing the interior space side of the structure constituting the vehicle body includes:
Vibration can be prevented from being transmitted from the underframe. Thus, even if the vibration is transmitted to the underframe as the railway vehicle travels, the structure can be prevented from being a source of noise in the vehicle interior space. Therefore, it is possible to form an in-vehicle space in a good environment with low noise. Further, since the surface of the structure on the side of the interior space is formed by the face plate, the appearance is good, and it is not necessary to separately provide a surface material or the like. It is not necessary to provide a sound absorbing material and a surface material on the interior space side surface of the structure, and by separately providing these members, it is possible to prevent the interior space from being reduced, thereby reducing interior noise. As a result, the interior space of the vehicle can be made as large as possible.

[0013]

FIG. 1 is a sectional view showing a soundproof structure 20 of a structure using a sandwich panel according to an embodiment of the present invention. FIG. FIG. 2 is a cross-sectional view showing a part of a vehicle body 21 in a simplified manner.
FIG. 1 shows an enlarged section I of FIG.
Shows a cross section in a plane perpendicular to the vehicle longitudinal axis of the body 21 of the leading vehicle. In a high-speed railway vehicle such as a Shinkansen, the leading portion of the leading vehicle is sharpened and has a continuous shape to reduce the impact sound generated when entering a tunnel.
It is formed in a streamline shape combining dimensional curved surfaces, and has a complicated shape. The structure 22 is made of a composite material in order to easily form the leading portion having such a shape and easily manufacture the leading vehicle including the leading portion, and to reduce the weight of the body 21 of the leading vehicle. It is configured using a sandwich panel.

The soundproof structure 20 is connected to an underframe 23 which is a structure constituting the vehicle body 21 by a connecting portion 24 so as to be connected to the underframe 23.
And a soundproof structure of a structure 22 constituting the vehicle body 21. In the vehicle body 21, the structure 22 is connected to the periphery of the frame 23 so as to cover the structure 22 on the frame 23, and an internal space 31 partitioned from the external space 30 is formed.

The structural body 22 is provided with a vibration damping material 27 near the connecting portion 24 between two face plates 25 and 26 made of a fiber reinforced synthetic resin material, and a core having a large number of voids in a region excluding the vicinity of the connecting portion. It is configured by using a sandwich panel 29 provided with 28. The structure 21 may be composed of only the sandwich panel 29, or may be composed in combination with a member such as another panel.

The face plate 25 of the sandwich panel 29 is formed by laminating and curing a prepreg, which is a composite material. The prepreg is made of a fiber reinforced thermosetting synthetic resin, and is configured by impregnating a fiber reinforced material with a synthetic resin. The fiber reinforcement is, for example, a woven fabric such as a plain weave or a satin weave in which the warp and the weft are made of carbon fiber, glass fiber or aramid fiber. For example, carbon fiber
It is preferable from the viewpoint of strength. The synthetic resin is, for example, an unsaturated polyester, phenol resin, polyimide resin or epoxy resin. Another face plate 26 is also face plate 2
5 is formed in the same manner.

Each of the face plates 25 and 26 is integrally formed so as to be adhered to each other at an end portion arranged near the underframe 23. Specifically, when the prepregs are laminated and cured to form the respective face plates 25 and 26, the end portions 25a and
The prepreg is formed by curing the prepreg in a state where the face plates 25 and 26 are laminated on each other at 26a. Each face plate 25,
In the remaining region except for the end portions 25a and 26a formed integrally with each other, they are arranged at intervals from each other. Specifically, the face plate 26 arranged on the outer space 30 side smoothly extends to the end 26a and extends to the extending surface of the sandwich panel 29, and the face plate 25 arranged on the vehicle interior space 31 side includes
Bending with respect to the end portion 25a, it is inclined and continued to form an angle of, for example, about 45 degrees with respect to the extension surface of the sandwich panel 29, and extends away from the face plate 26 as the distance from the end portion 25a increases. In a region away from the end portion 25a from a position where a predetermined distance L1 has been reached with respect to 26, the region extends to the extension surface of the sandwich panel 29 while maintaining a predetermined distance L1 between the face plate 26 and the end plate 25a.

The connecting portions 24 of the structural body 22 are constituted by the end portions 25a and 26a formed integrally with the respective face plates 25 and 26. In other words, the connecting portion 24 is constituted by a part of the sandwich panel 29. Each face plate 2
The remaining ends other than the ends 25a and 26a proximate to the underframes 5 and 26 are formed in the same manner as the ends 25a and 26a, and are connecting portions for connecting to other panels constituting the structure 22. Or another structure.

The damping material 27 is made of a rubber material or a polymer material. Specifically, as the damping material 27, for example, an asphalt-based material commercially available as an underseal under the trade name, or a rubber-based material commercially available as a trade name Danshape or Orotex can be used.
These asphalt-based materials or rubber-based materials have excellent vibration damping characteristics with respect to vibrations in middle and high frequency ranges.

The damping material 27 is connected to the connecting portion 2 as described above.
4 is provided between the respective face plates 25 and 26 in the vicinity of the
5, 26, for example, is adhered and fixed. When viewed in relation to the face plate 25 on the vehicle interior space 31 side, the vibration damping material 27 is located at a distance from a position where each of the face plates 25 and 26 branches off in a direction away from the connecting portion 24 along a surface inside the panel. It is provided up to the position of L2. The distance L2 is determined to be about half the wavelength of the bending wave (vibration) of the face plates 25 and 26 to be damped. Thereby, the vibration damping characteristics with respect to the vibration having a wavelength twice as long as the distance L2 (= one-frequency) are excellent.

The core 28 is provided between the face plates 25 and 26 except for a region where the damping material 27 is provided.
5 and 26, for example, are adhered and fixed. This core 2
Reference numeral 8 denotes a so-called Lohacell core in which a number of voids are formed by continuous bubbles. The core 28 is made of a hard foam synthetic resin. As the hard foam synthetic resin, for example, polymethacrylimide is suitably used. This polymethacrylimide has higher mechanical strength such as tensile strength, compressive strength, elastic modulus, shear strength, etc., compared to other synthetic resin foams, and particularly has excellent properties at low temperatures, and further has heat resistance, Excellent solvent resistance and heat insulation.

The sandwich panel 29 constructed as described above is made of a non-combustible material and is lightweight (light weight).
And can be formed with high rigidity. Further, the sandwich panel 29 can be formed by using a mold, and can form a three-dimensional curved panel, and can be suitably used for the structure 21 at the leading portion of the leading vehicle as described above. Can be.

The underframe 23 is formed as a frame using a plurality of, for example, steel beams including bolster beams. This underframe 23
Is a bolster, which is connected to a carriage provided with wheels, and the underframe 23 is provided on the carriage. The structure 22 using the above-described sandwich panel 29 on the periphery of the underframe 23 is connected to the connecting member 3.
3 are connected.

The connecting member 33 has an L having two mounting pieces.
It is a letter-shaped member. The connecting member 33 is fixed using, for example, a bolt with one of the attachment pieces stacked on the upper part of the peripheral edge of the underframe 23. In this state, the other mounting piece of the connecting member 33 protrudes so as to rise from the underframe 23, and the connecting portion 24 is overlapped on the other mounting piece from the external space side. 24
Is fixed to the connecting portion. Thus, the structure 22 is fixed to the underframe 23 via the connecting member 33. In this way, the structure 22 is firmly fixed and provided so as to rise upward from the periphery of the underframe 23, and the body 22 is constituted by the structure 22 and the underframe 23.

According to the soundproof structure 20 of this embodiment, the structure 22 is made of a fiber-reinforced synthetic resin material.
Core 22 having a large number of gaps between two face plates 25 and 26
, And a lightweight and highly rigid structure can be obtained. In the vicinity of the connecting portion 24 of the structure 22, a vibration damping material 27 is provided between the two face plates 25 and 26, and it is possible to suppress the portion of each of the face plates 25 and 26 near the connecting portion 24 from vibrating. . As a result, each face plate 25, 26
Vibration can be prevented from being transmitted to a portion of the area excluding the vicinity of the connection portion of each of the face plates 25 and 26 via the portion near the connection portion 24.

Such a structure 22 is a vehicle structure that forms a vehicle body 21 together with a frame 23 to which the structure 22 is connected. Since the frame 23 is connected to the bogie, the structure 22 accompanies the traveling of the vehicle. Vibration generated in a bogie or the like is caused by the underframe 23,
The light is transmitted to the connecting portion 24 of the structure 22 via the connecting member 33. The vibration transmitted to the connecting portion 24 is applied to each face plate 25, 2
The vibration damping material 27 is provided between the face plates 25 and 26 near the connecting portion as described above, so that the vibration of the face plates 25 and 26 in this region is suppressed. Therefore, even if vibration is transmitted from the underframe 23 to the structure 22,
Vibration is transmitted to the vicinity of the connecting portion, and the structure 22
In a region where the core 28 is provided between the face plates 25 and 26 except for the connection portion and the vicinity of the connection portion, specifically, the vibration of the face plates 25 and 26 is reduced, and the vibration of the face plates 25 and 26 is reduced. Can be prevented from being a source of noise.

As described above, the damping member 27 is provided inside the sandwich panel 29 for constituting the structure 22 to form the soundproof structure 20 for preventing the generation of noise.
The soundproof structure 20 is also realized by simply connecting the Therefore, the construction work is easy and the labor can be reduced. The damping member 27 may be provided between the face plates in the same manner as the core 28, and the manufacture of the structure is substantially the same as the operation of manufacturing a structure using a panel without the damping material 27.
The structure 22 can be easily manufactured, and the cost for manufacturing a structure having a soundproof structure can be reduced. Furthermore, since there is no need to provide a separate member, the overall weight can be reduced.

As described above, the structure 2
2 can be prevented from vibrating and generating noise. Specifically, it is possible to prevent the vibration from being transmitted from the underframe 23 to a portion of the structure 22 constituting the vehicle body 21 except for the vicinity of the connecting portion of the face plate 25 facing the interior space 31 side. Thus, even if the vibration is transmitted to the underframe 23 as the railway vehicle travels, the structure 22 can be prevented from being a source of noise in the vehicle interior space 31. Therefore, it is possible to form the in-vehicle space 31 having a low noise and a favorable environment. Further, since the surface of the structure 22 on the side of the vehicle interior space 31 is formed by a face plate, the appearance is good, and it is not necessary to separately provide a surface material or the like. It is not necessary to provide a sound absorbing material and a surface material on the interior space side surface of the structure, and by separately providing these members, it is possible to prevent the interior space from being reduced, thereby reducing interior noise. As a result, the interior space of the vehicle can be made as large as possible.

The face plates 25 and 26 are arranged such that the face plate 26 on the side of the external space 30 extends along the extending surface of the sandwich panel 29 in the vicinity of the connecting portion 24, and the face plate 25 on the side of the internal space 31 is connected to the sandwich panel 29. Of the damping member 27 projected on the extending surface of the sandwich panel 29, even if the arrangement area S of the damping material 27 projected on the extending surface of the sandwich panel 29 is small. 27 The contact area (the area of the distance L2) can be increased. Accordingly, it is possible to prevent a decrease in strength and an increase in weight due to an increase in the area S in which the vibration damping material 27 is provided, and it is possible to greatly suppress the vibration of the face plate 25 that is a source of vehicle interior noise.

Further, since the vibration damping member 27 is made of the above-mentioned material, the vibration transmitted to the face plates 25 and 26 in the middle to high frequency range can be more reliably suppressed, attenuated and reduced. In addition, vibration near a frequency having a wavelength twice as long as the distance L2 can be more reliably damped. This distance L2 is
Of the vibration components of each frequency transmitted from the underframe to the face plates 25 and 26, the contribution as the cause of noise is made the half of the wavelength of the vibration of the frequency, so that the vicinity of the frequency that causes the noise most Vibration can be suppressed small, and the soundproofing effect can be enhanced.

FIG. 3 is a perspective view showing a soundproof structure 20A according to another embodiment of the present invention. The soundproof structure 20A is similar to the soundproof structure 20 shown in FIGS. 1 and 2 described above,
Corresponding components are denoted by the same reference numerals with "A" appended thereto,
Only different configurations will be described, and description of similar configurations will be omitted. Structure 22 in which soundproof structure 20A is adopted
A is a structure for constituting the outer wall of the spacecraft, and is constituted by a sandwich panel 29A and a solar cell panel 50. In the sandwich panel 29A, the face plates 25A and 26A made of the same material as the above-described embodiment are stacked on each other at the peripheral edge to be integrally formed, and the connecting portion 24A is formed.
Are formed to extend all around. Each face plate 25A, 26A
Are arranged so as to be connected to the connecting portion 24A so as to be mutually expanded and spaced apart. The vibration damping material 2 is provided between the face plates 25A and 26A over the entire circumference near such a connecting portion.
7A is provided, and a core 28A is provided between the face plates 25A and 26A in a region surrounded by the vibration damping material 27A. The materials of the damping material 27A and the core 28A are the same as those of the above-described embodiment.

One of the face plates 26A of such a sandwich panel 29A is formed in the center portion so as to be concave on the other face plate 25A side, whereby the sandwich panel 29A is formed.
A recess is formed in A. A solar cell panel 50 having a plurality of solar cells is fitted and provided in the recess. This structure 22A is connected to a body of a spacecraft (not shown) by a connecting portion 24A in the same manner as the above-described embodiment, and forms an outer wall to form an internal space of the spacecraft. The solar cell panel 50 faces the external space side, and can generate electric power required in the spacecraft.

Also in this embodiment, the structure 22A
Furthermore, even if vibration is transmitted from a body or the like to which the structure is connected, it is possible to prevent each of the face plates 25A and 26A from vibrating in a large area at the center. This can prevent the face plate 25A from being a source of noise in the internal space of the spacecraft. After achieving the soundproofing effect in this manner, as in the above-described embodiment, the manufacturing can be facilitated and the cost can be reduced, and the space in the spacecraft can be increased. In addition, by suppressing the vibration of the face plate 26A, it is possible to prevent the solar cell panel 50 from vibrating, and to contribute to preventing the solar cell panel 50 from being damaged.

The above embodiment is merely an example of the present invention, and the configuration can be changed within the scope of the present invention. For example, the present invention may be applied to a structure for forming an outer wall of another vehicle instead of a railway vehicle.

[0035]

According to the present invention, a structure connected to a structure is provided between two face plates made of a fiber-reinforced synthetic resin material.
It is constituted by using a sandwich panel provided with a core having a large number of voids, and a lightweight and highly rigid structure can be obtained. In the vicinity of the connecting portion connected to the structure of this structure, a vibration damping material is provided between the two face plates, and it is possible to suppress vibration of the portion near the connecting portion of each face plate. Accordingly, it is possible to prevent the vibration from being transmitted from the connecting portion to the portion of the area excluding the vicinity of the connecting portion of each face plate via the portion near the connecting portion of each face plate. Therefore, even if vibration is transmitted from the structure to the structure, the vibration is transmitted only to the vicinity of the connecting portion, and in a large area of the structure, the vibration of each face plate becomes small, and the vibration of each face plate becomes a noise source. Can be prevented.

As described above, since the damping material is provided inside the sandwich panel for forming the structure to prevent the generation of noise, the soundproof structure can be realized only by connecting the structure to the structure. . Therefore, the construction work does not require a difficult and troublesome work such as separately providing a sound absorbing material, and can be performed easily and with less trouble.
Also, the damping material may be provided between the face plates in the same manner as the core, and the production of the structure is almost the same as the operation of producing a structure using a panel without the vibration damping material. And the manufacturing cost can be reduced. Furthermore, since it is not necessary to provide a separate member, it is possible to reduce the overall weight.In addition, according to the present invention, in a portion of the region excluding the vicinity of the connecting portion of the face plate facing the interior space side of the structure constituting the vehicle body, Vibration can be prevented from being transmitted from the underframe. As a result, even if vibration is transmitted to the underframe as the railway vehicle travels,
It is possible to prevent the structure from being a source of noise in the vehicle interior space. Therefore, it is possible to form an in-vehicle space in a good environment with low noise. Further, since the surface of the structure on the side of the interior space is formed by the face plate, the appearance is good, and it is not necessary to separately provide a surface material or the like. It is not necessary to provide a sound absorbing material and a surface material on the interior space side surface of the structure, and by providing these members separately, it is possible to prevent the interior space from being reduced, thereby reducing the interior noise. In addition, it is possible to form a vehicle interior space as large as possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a soundproof structure 20 of a structure using a sandwich panel according to an embodiment of the present invention.

FIG. 2 shows a vehicle body 21 of a railway vehicle in which the soundproof structure 20 is adopted.
It is sectional drawing which shows a part of.

FIG. 3 is a sectional view showing a soundproof structure 20A of a structure using a sandwich panel according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a soundproof structure 1 of a conventional structure.

FIG. 5 is a cross-sectional view showing another conventional soundproof panel 11;

[Explanation of symbols]

 REFERENCE SIGNS LIST 20 soundproofing structure 21 body 22, 22A structure 23 underframe 24, 24A connecting portion 25, 26; 25A, 26A face plate 27; 27A damping material 28; 28A core 30 external space 31 interior space

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shunichi Bando 1 Kawasaki-cho, Kakamigahara-shi, Gifu Prefecture Kawasaki Heavy Industries, Ltd. Gifu Factory (72) Inventor Makoto Furukawa 2-1-1 Wadayama-dori, Hyogo-ku, Kobe-shi, Hyogo Prefecture No. 18 F-term (reference) in Kawasaki Heavy Industries, Ltd. Hyogo Plant 4F100 AK49 AM00 AN00 AR00C BA03 BA07 BA10A BA10B DC11C DH02A DH02B DJ00C GB07 GB31 JH01 JH02C

Claims (2)

[Claims] 1. A soundproof structure of a structure connected to a predetermined structure by a connecting portion, wherein a damping material is provided between two face plates made of a fiber-reinforced synthetic resin material near the connecting portion, A soundproof structure for a structure using a sandwich panel, wherein a core having a large number of voids is provided in a region except the vicinity of the connection portion. 2. The vehicle according to claim 1, wherein the predetermined structure is an underframe that forms a vehicle body of the railway vehicle, and the structure is a structure that is connected to the underframe and forms a vehicle body together with the underframe. Item 2. A soundproof structure for a structure using the sandwich panel according to Item 1.