KR100787297B1 - Sound absorbing structure and method of producing the same - Google Patents

Abstract

The present invention expands the peak frequency with high sound absorption. The convex part 2 which has the convex part 3 and the recessed part 4 (uneven part) and the opening part 5, and the hollow part 6 which communicates with an external space through the opening part 5 are convex part ( 3) and the blocking plate 1 bonded to the uneven plate 2 so as to form by closing one of the recesses 4, and a plurality of through holes 11a and 12a, and the hollow portion 6 The 1st and 2nd porous plates 11 and 12 divided into more than one division space are provided.

Convex part, concave part, opening part, uneven plate, hollow part, blocking plate, perforated plate

Description

SOUND ABSORBING STRUCTURE AND METHOD OF PRODUCING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for structural members, panels, and soundproof covers of automobiles, railroad cars, buildings, general-purpose machines, etc., and relates to sound-absorbing structures that exhibit soundproofing performance with respect to sound pressure.

Conventionally, as described in Patent Literature 1 below, a perforated plate is provided on the lower surface side of a panel through an air layer, and the thickness of the perforated plate, the diameter of the hole, the pitch, and the thickness of the air layer are adjusted to absorb noise in a predetermined frequency range. BACKGROUND ART Sound absorbing members for vehicles are known. According to this configuration, it is possible to effectively absorb noise of a specific frequency by adjusting the thickness of the perforated plate, the diameter of the hole, the pitch, and the thickness of the air layer using the Helmhortz resonance principle.

[Patent Document 1] Japanese Unexamined Patent Publication No. 6-298014

However, in the above-described conventional structure, the sound absorption rate becomes large only near the resonant frequency of Helmholtz, and thus there is a problem that it is difficult to make the sound absorption performance wideband.

1 is a schematic configuration diagram of a sound absorbing structure.

2 is an exploded perspective view of the sound absorbing structure.

3 is a schematic configuration diagram of a sound absorbing structure.

4 is a schematic configuration diagram of a sound absorbing structure.

5 is a schematic configuration diagram of a sound absorbing structure.

6 is an exploded perspective view of the sound absorbing structure.

7 is a schematic configuration diagram of a sound absorbing structure.

8 is a schematic configuration diagram of a sound absorbing structure.

9 is a graph showing sound absorption characteristics.

10 is a graph showing sound absorption characteristics.

11 is a schematic configuration diagram of a sound absorbing structure of a modification.

12 is a schematic configuration diagram of a sound absorbing structure of a modification.

13 is a schematic configuration diagram of a sound absorbing structure of a modification.

14 is a schematic configuration diagram of a sound absorbing structure.

15 is a schematic configuration diagram of a sound absorbing structure of a modification.

16 is an exploded perspective view of the sound absorbing structure.

17 is an exploded perspective view of the sound absorbing structure.

<Description of the code>

1: occlusion plate

2: uneven plate

3: convex

4 recess

5: opening

6: hollow part

11: first porous plate

12: second porous plate

21: perforated plate

31: first perforated plate

41: perforated plate

51: sound absorbing material

According to a first aspect of the present invention, an uneven plate having an uneven portion and an opening portion, a blocking plate bonded to an uneven plate to form a hollow portion communicating with an external space through the opening portion by closing one of the uneven portions, and two hollow portions It is a structure provided with the 1st partition member which divides into the above-mentioned 1st division space. According to this structure, the excellent sound absorption performance by which the frequency band with a high sound absorption rate was expanded can be obtained.

Moreover, 2nd invention is a structure provided with the blocking member which closes the opening of the open part in which the one side adjacent to a hollow part is opened in the uneven plate of 1st invention. Moreover, 3rd invention is the structure provided with the 3rd partition member which divides the open part in which the one side adjacent to a hollow part is opened in two or more 3rd division space in the uneven plate of 1st invention. According to this structure, a higher sound absorption can be obtained.

Moreover, 4th invention is the structure which the 1st division member of 1st invention has a porous plate which has many through-holes. 5th invention is a structure in which the 3rd partition member of 3rd invention has a porous plate which has many through-holes. According to such a structure, the outstanding sound absorption performance by which the frequency band with a high sound absorption rate was expanded can be obtained. Moreover, the 6th invention is the structure which has the foil in which the 1st partition member of the 1st invention was provided so that vibration or friction was possible, and the 7th invention is a structure in which the 3rd partition member of the 3rd invention was provided so that vibration or friction was possible. It is a composition with a foil. In this case, the foil of 6th invention may have many through holes (eighth invention), and the foil of 7th invention may have many through holes (ninth invention). Moreover, the foil of 6th invention may have an uneven part (10th invention), and the foil of 7th invention may have an uneven part (11th invention).

Moreover, 12th invention is a structure in which a sound absorption material is provided in at least 1 of 1st division space partitioned into two or more in 1st invention. Moreover, 13th invention is a structure in which the sound absorption material is provided in at least 1 of 3rd division space partitioned into two or more in 3rd invention. According to such a structure, the excellent sound absorption performance which the frequency band with a high sound absorption rate further expanded can be obtained further.

Further, in the fourteenth invention, in the first invention, only one of the first divided spaces divided into two or more is configured to communicate with the external space. According to a fifteenth invention, in the third invention, only one of the third division spaces divided into two or more is in communication with the external space. According to this, the configuration is simplified.

In addition, the sixteenth aspect of the present invention provides an interior member having an opening, an exterior member disposed to face the interior member at intervals, and a connection member connecting the interior member and the exterior member to form a hollow portion communicating with the external space through the opening. And a second partition member for partitioning the hollow portion into two or more second partition spaces. According to this structure, the excellent sound absorption performance by which the frequency band with a high sound absorption rate was expanded can be obtained.

The seventeenth aspect of the present invention also provides a concave-convex plate in which the interior member of the sixteenth invention is integrated with the connecting member and has an uneven portion formed by the connecting member, and the exterior member is a closed plate joined to close one side of the uneven portion. Doing. According to this structure, manufacture of a sound absorption structure can be made easy by integrating a built-in member and a connection member.

Moreover, 18th invention is a structure provided with the blocking member which closes the opening of the open part in which the one side adjacent to a hollow part opens in the uneven plate of 17th invention. Moreover, 19th invention is a structure provided with the 3rd partition member which divides the open part in which the one side adjacent to a hollow part is opened by two or more 3rd division space in the uneven plate of 17th invention. According to this structure, a higher sound absorption can be obtained.

Moreover, 20th invention is the structure which the 2nd partition member of 16th invention has a porous plate which has many through-holes. A twenty-first aspect of the invention is the configuration in which the third partition member of the nineteenth aspect has a porous plate having a plurality of through holes. According to such a structure, the outstanding sound absorption performance by which the frequency band with a high sound absorption rate was expanded can be obtained. Moreover, the 22nd invention may be the structure which has the foil in which the 2nd division member of 16th invention was provided so that vibration or friction was possible. The twenty-third invention may be configured such that the third partition member of the nineteenth invention has a foil provided so as to be vibrable or frictional. In this case, the foil of the twenty-second invention may have a large number of through holes (a twenty-fourth invention), and the foil of the twenty-third invention may have a large number of through holes (a twenty-fifth invention). Moreover, the foil of 22nd invention may have an uneven part (26th invention), and the foil of a 23rd invention may have an uneven part (27th invention).

Moreover, in the sixteenth invention, in the sixteenth invention, a sound absorbing material is provided in at least one of the second division spaces divided into two or more. 29th invention is a structure which the sound absorption material is provided in at least 1 of 3rd division space partitioned into two or more in 19th invention. According to this structure, the excellent sound absorption performance which the frequency band with a high sound absorption rate further expanded can be obtained further.

Further, in the sixteenth invention, in the sixteenth invention, only one of the second division spaces divided into two or more is configured to communicate with the external space. In the thirty-first aspect of the present invention, in the nineteenth aspect of the invention, only one of the third divided spaces divided into two or more portions communicates with the external space. According to this configuration, the configuration is simplified.

The present invention also provides an uneven plate having an uneven portion and an opening, a blocking plate bonded to the uneven plate to form a hollow portion communicating with an external space through the opening by closing one of the uneven portions, and the hollow plate. A method of manufacturing a sound absorbing structure having a first partition member that partitions a portion into two or more first division spaces, wherein a support hole is formed in the first partition member, and the support hole is inserted into the convex portion of the uneven plate. The first partition member is provided in the hollow portion by penetrating and supporting and fixing the support hole by the convex portion during insertion. In addition, the present invention provides an uneven plate having an uneven portion and an opening, a blocking plate bonded to the uneven plate to form a hollow portion communicating with an external space through the opening by closing one of the uneven portions, and the hollow plate. A method for producing a sound absorbing structure having a first partition member for partitioning a portion into two or more first division spaces, wherein the fitting projection is formed on the first partition member, and the fitting projection is a projection of the uneven plate. It is a structure which provides the said partition member in the said hollow part by fitting into the said, and supporting and fixing the said fitting convex part by the said convex part during fitting.

The present invention also provides an interior member having an opening, an exterior member spaced apart from the interior member, and connecting the interior member and the exterior member to form a hollow portion communicating with an external space through the opening. And a second partition member for partitioning the hollow portion into two or more second partition spaces, wherein the built-in member is an uneven plate having an uneven portion formed by the connecting member and integrated with the connecting member, The exterior member is a method for producing a sound absorbing structure, which is a closed plate joined to close one side of the uneven portion, forming a support hole in the second partition member, and inserting the support hole through the convex portion of the uneven plate. The second partition member is provided in the hollow portion by supporting and fixing the support hole by the convex portion during insertion. It is configured. The present invention also provides an interior member having an opening, an exterior member spaced apart from the interior member, and connecting the interior member and the exterior member to form a hollow portion communicating with an external space through the opening. And a second partition member for partitioning the hollow portion into two or more second partition spaces, wherein the built-in member is an uneven plate having an uneven portion formed by the connecting member and integrated with the connecting member, The exterior member is a method for producing a sound absorbing structure, which is a blocking plate joined to close one side of the uneven portion,

The second partition by forming a fitting convex portion on the second partition member, fitting the fitting convex portion to the convex portion of the uneven plate, and supporting and fixing the fitting convex portion by the convex portion during the fitting. It is a structure which provides a member in the said hollow part. In addition, a plurality of through holes are provided in at least one of the first and second partition members. Thereby, the sound absorption structure which has a division space can be created easily and with high precision.

(1st embodiment)

A first embodiment of the present invention will be described below with reference to Figs.

The sound absorbing structure according to the present embodiment includes, for example, a moving device including a drive mechanism such as an engine, a motor, a gear, and the like, such as a car, a railroad car, a construction vehicle, a ship, and an automatic transport device. It is suitably used as a soundproof cover, a structural member, a panel or a floor, a wall, or a ceiling of a built-in facility machine.

As shown in Fig. 1, the sound absorbing structure is a yaw facing the sound source that generates noise, for example, a plate-shaped occlusion plate 1 facing the outside where noise is a problem, and a driving mechanism such as an engine. It has the iron plate 2. The obstruction plate 1 and the concave-convex plate 2 are formed of a metal or resin material such as iron or aluminum. In addition, it is preferable that the obstruction plate 1 and the uneven plate 2 are formed of the same material so that the separate treatment at the time of recycling is unnecessary.

The concave-convex plate 2 protrudes from the concave portion 4 and the convex portion 3 protruding from the concave portion 4 in the direction of the obstruction plate 1 and joined to the obstruction plate 1. Have A plurality of openings 5 are formed in the recesses 4. In addition, the convex part 3 is arrange | positioned at the predetermined distance and distributed. In addition, the convex part 3 may be continued from one end to the other end. In addition, the opening part 5 may be further formed in the convex part 3.

The said convex part 3 is formed in the cone shape which has the flat top part 3a and the side part 3b which inclined while expanding the diameter from the peripheral part of the top part 3a. The above-mentioned closure plate 1 is joined to the top part 3a of the convex part 3 so that the recessed part 4 may be closed. As a result, the hollow portion surrounded by the concave portion 4, the obstruction plate 1, and the convex portion 3 between the obstruction plate 1 and the uneven plate 2, and communicated with the external space through the opening 5 ( 6) is formed.

The hollow portion 6 is provided with a first porous plate 11 and a second porous plate 12 (first partition member). The 1st and 2nd porous plates 11 and 12 are arrange | positioned in parallel with respect to the recessed part 4, and the hollow part 6 is arranged in this order from the sound source side to the division space 8, 9, 10 of three layers. It is partitioned. Each of the porous plates 11 and 12 is provided with a plurality of through holes 11a and 12a and is provided with support holes 11b and 12b. The support holes 11b and 12b are arranged so as to have a positional relationship corresponding to the arrangement position of the convex portion 3, and are set to a hole diameter supported by the side surface 3b of the convex portion 3. That is, the hole diameters of the support holes 11b and 12b are different from those of the first porous plate 11 close to the sound source side and the second porous plate 12 far from the sound source side, that is, of the first porous plate 11. The hole diameter of the support hole 11b is larger than the hole diameter of the support hole 12b of the second porous plate 12. The first and second porous plates 11 and 12 are different from the side portions 3b of the convex portions 3 during the insertion penetration of the support holes 11b and 12b having different diameters into the convex portions 3. By contacting and supporting each part, the layer thickness d1, d2, d3 of the division space 8, 9, 10 is set, respectively.

The air in each of the division spaces 8, 9, and 10 is a spring, and the air in the through holes 11a and 12a of the porous plates 11 and 12 forms a multiple degree of freedom vibration system as a mass. When the sound of the resonant frequency of this resonant system enters from the opening part 5, the air in the through-holes 11a and 12a of the porous plates 11 and 12 vibrates violently, and has a large sound absorption force by friction loss.

Opening ratio β, sheet thickness t and hole diameter b of at least one member of the opening of the uneven plate 2 and the through holes 11a and 12a of the first and second porous plates 11 and 12. It is preferable that the parameter which consists of these is a combination which a sound absorption factor exhibits 0.3 or more independently.

Moreover, the parameter which consists of layer thickness d, aperture ratio (beta), sheet thickness t, and hole diameter b is the opening part 5 of the uneven plate 2, and the 1st and 2nd porous plates 11, It is preferable to set so that a viscous action may be caused to the air passing through at least one of the through holes 11a and 12a of 12). The reason for this is that, when the sound absorbing structure is formed by such a parameter, a viscous action is generated in the air to generate vibration and attenuation, and the frequency band width at which the sound absorption rate is 0.3 or more becomes 10% or more with respect to the resonance frequency f. This is because the sound absorption characteristics can be exhibited.

That is, as for the parameter of a sound absorption structure, the opening ratio (beta) of at least any one of the uneven plate 2 and the porous plates 11 and 12 is 3% or less, and each plate thickness t is 0.3 mm so that the said sound absorption characteristic may be provided. As mentioned above, it is preferable that the hole diameter b of the opening part 5 and the through holes 11a and 12a is set on the design conditions of 0.8 mm or less.

In addition, the hole diameter of the opening part 5 and the through holes 11a and 12a is not specifically limited in range, but any member is 5 mm or less, preferably 3 mm or less, and more preferably 1 mm or less. It is preferable. In addition, the sound absorbing structure may be constructed by focusing only on the diameters of the openings 5 and the through holes 11a and 12a. That is, the sound absorbing structure may have a configuration having first and second porous plates 11 and 12 having a plurality of through holes 11a and 12a having a diameter of 1 mm or less. And when the hole diameter of the through holes 11a and 12a is set to 1 mm or less in this way, a viscous action can be reliably produced in the air which flows through the through holes 11a and 12a.

Moreover, it is preferable that the lower limit of the diameter of the opening part 5 and the through holes 11a and 12a is 0.2 mm. The reason for this is that when the diameters of the through holes 11a and 12a are close to zero, the peak of the sound absorption rate is theoretically 1.0, but in reality, the peak does not reach 1.0, and when the diameter is very small such as 0.2 mm or less, the through holes It is because the viscosity of the air of 11a, 12a becomes too large, and it is thought that the resistance to air flow of the through-holes 11a, 12a becomes large, and sound absorption is rather low. In addition, when the diameter is very small, such as 0.2 mm or less, the manufacturing becomes very difficult, and the through holes 11a and 12a are easily blocked by garbage or dust depending on the use environment.

The openings 5 and the through holes 11a and 12a may be elliptical, rectangular, polygonal or slit-shaped, and various shapes may be mixed between the openings 5 and the through holes 11a and 12a or inside. . In addition, the opening part 5 and the through holes 11a and 12a may be set to the same size and diameter, and various sizes and diameters may be mixed between or inside the opening part 5 and the through holes 11a and 12a. good. When various sizes and diameters are mixed, the frequency band width which exhibits sufficient sound absorption performance can be expanded.

In addition, although the sound absorption structure in this embodiment has the structure which the division space 8, 9, 10 of each layer is arrange | positioned in parallel, it is not limited to this. That is, the division space 8, 9, 10 of a sound absorption structure may be divided | segmented and partitioned in arbitrary shape and volume in the hollow part 6 by the partition member which partitions the hollow part 6. For example, the perforated plates 11, 12 may be provided at equal intervals so that the layer thicknesses of the division spaces 8, 9, 10 are equal, or may be provided at unequal intervals so that the layer thickness is uneven. . In this case, the sound absorption performance can be easily adjusted by changing the partition member.

In the present embodiment, the porous plates 11 and 12 are provided in the hollow part 6, but as shown in FIG. 11, the top part 3a and the side part of the convex part 3 adjacent to the hollow part 6 are shown. The porous plate 14 (third partition member) and the porous plate 15 (closed member) may be provided in the open portion 7 surrounded by (3b). In this case, the porous plate 14 and / or the porous plate 15 may have a structure which is raised in the opposite direction to the convex portion 3 in order to take the air layer large. On the contrary, the porous plate 14 and / or the hole plate 15 may have a structure that is concave toward the convex portion 3 because the air layer may be thin when absorbing very high frequencies. In addition, the porous plate 14 may be provided without providing the porous plate 14. In addition, the porous plates 14 and 15 may be a metal foil and a thin film. In this case, the metal foil and the thin film may or may not have a through hole.

In the above configuration, a method for producing a sound absorbing structure will be described.

First, it is actually measured or estimated which frequency characteristic the noise used as a sound absorption object has. Then, the layer thicknesses d1, d2, d3 are from 1 mm to 50 mm, the uneven plate 2, the first and the first so that the sound absorption characteristics of the frequency band width including the plurality of peak components are 0.3 or more. The opening ratio β of the second porous plates 11 and 12 is 15% or less, the plate thickness t is 0.3 mm or more, and the hole diameter b of the opening 5 and the through holes 11a and 12a is 0.8 mm. The parameters are determined in consideration of the air viscosity based on the following design conditions.

Next, as shown in Fig. 2, a sound absorbing structure is created with the above parameters. Specifically, a metal plate such as iron or aluminum having a predetermined thickness is prepared, and set in a press working machine. Then, the metal plate is pressed, the opening 5 is punched, and the convex portion 3 is formed, thereby forming the uneven plate 2. Moreover, the metal plate in which through-hole 11a, 12a of the small diameter was formed previously is prepared, and the support hole 11b, 12b is formed by press working like the uneven | corrugated board 2, respectively, and the 1st porous plate 11 And the second porous plate 12 are created, respectively. In addition, the through holes 11a and 12a may be formed by press working simultaneously with the support holes 11b and 12b.

Next, after the concave-convex plate 2 is set on the die, the first porous plate 11 is covered from above the concave-convex plate 2, and the convex portion 3 is inserted through the support hole 11b. do. And when the support hole 11b contacts and is supported by the side part 3b of the convex part 3 in the middle of this insertion penetration, the 1st porous board 11 is pressed from the upper direction by the predetermined pressure to the uneven plate 2 direction. The support hole 11b is fixed by being pressed against the convex part 3. Moreover, in order to make a fixation reliable, the contact part of the convex part 3 and the support hole 11b may be fixedly attached by adhesive material or welding, and may be fastened by screwing. In addition, the hollow part 6 may be completely sealed by the blocking plate 1 and the uneven plate 2, and when the adhesive part of the blocking plate 1 and the top part 3a has only one point, it will be completely sealed. You do not have to. That is, the adjacent hollow parts 6 may communicate with each other through the clearance gap which arises between the obstruction plate 1 and the top part 3a.

Thereafter, the second porous plate 12 is covered from above the first porous plate 11, and the second porous plate is formed by the convex portion 3 in the middle of insertion, as in the case of the first porous plate 11. The support hole 12 of 12 is supported and fixed. And the blocking plate 1 is mounted in the top part 3a of the convex part 3 which protruded from the support hole 12b of the 2nd porous plate 12, and is fixed by an adhesive material etc. Thereby, the 1st and 2nd porous plates 11 and 12 have the support holes 11b and 12b of different diameter, respectively, and the side part 3b of the convex part 3 is fixed to another part, and the convex part 3 By the obstruction plate 1 being fixed to the top part 3a of), a sound absorbing structure having partition spaces 8, 9, and 10 of the layer thicknesses d1, d2, and d3 is easily and accurately produced.

In addition, when providing the porous plates 14 and 15 in the open part 7, for example, the porous plates 14 and 15 with different diameters are created, and since the diameters are small, in order, the convex part 3 The sound absorption structure is created by installing toward the opening from the top part 3a side.

Next, the operation of the sound absorbing structure will be described.

When the sound source generates noise, the noise proceeds and reaches the sound absorbing structure disposed opposite the sound source. At this time, the sound absorbing structure is formed with an aperture ratio or a plate thickness, a hole diameter, and an air layer thickness of the built-in plate configured to satisfy the required performance, and the sound absorbing characteristics exhibit high sound absorption in the peripheral band of the plurality of resonance frequencies. It is set as the structure provided with the division space 8, 9, 10 of a layer. Therefore, when the noise reaches the sound absorbing structure, the noise components of the peripheral bands of the plurality of resonance frequencies are absorbed at a high sound absorption rate, so that the noise of the main and wide frequency bands generated by sound sources such as engines can be absorbed. Thereby, the sound absorption structure can absorb the noise of a main and wide frequency band.

As described above, the sound absorbing structure of the present embodiment includes an uneven plate 2 having the convex portion 3 and the concave portion 4 (the uneven portion) and the opening portion 5, and the external space through the opening portion 5. The blocking plate 1 bonded to the uneven plate 2 so as to form the hollow portion 6 in communication by closing one of the convex portion 3 and the recessed portion 4, and a plurality of through holes 11a and 12a. ) And the first and second porous plates 11 and 12 which divide the hollow portion 6 into two or more division spaces.

In addition, although this invention was demonstrated based on suitable embodiment, this invention can be changed in the range which does not exceed the meaning.

For example, in the present embodiment, the obstruction plate 1, the concave portion 4, and the like are in a flat plate shape, but the present invention is not limited thereto, and may have irregularities and curved surfaces locally. You may have it. In addition, in this embodiment, the two porous plates 11 and 12 are provided in the hollow part 6 formed with the recessed part 4 and the blocking plate 1, while having the some convex part 3 dispersely arrange | positioned. Although the case where it prepared was described, it is not limited to this. That is, as shown in Fig. 3, the hollow formed with the concave portion 4 and the obstruction plate 1 having the concave-convex plate 2 having the convex portion 3 formed around the one concave portion 4 is formed. The structure which provided three or more porous plates 21 in the part 6 may be sufficient. In this case, since the large number of division spaces 8, 9, and 10 are formed by the porous plate 21, more numerous peak frequencies can be realized, and the sound absorption performance can be widened. Of course, one sheet may be sufficient as the porous plate 21. In addition, the through holes 21a of each of the porous plates 21 may have various shapes and diameters such as ellipses, rectangles, polygons, and slit shapes, such that they exist in and between each of the porous plates 21, or may be mixed. .

In addition, as shown in Fig. 4, the sound absorbing structure may have a configuration in which the arrangement of Fig. 3 is arranged in parallel in a line shape or a longitudinal or horizontal matrix shape. In this configuration, the sound absorbing power can be improved. Moreover, the opening part 5 of the uneven plate 2 and the through-hole 21a of each porous plate 21 may be made the same in various shapes and diameters between and inside the hollow part 6 arrange | positioned in parallel, It may be mixed. Thereby, the sound absorption performance of a wider peak frequency can be obtained. In addition, although numerical values, such as an opening ratio (beta), the thickness layer (d) and the plate | board thickness (t), are concretely described, it is not limited to this. Such a numerical value is determined by the environment in which the sound absorbing structure according to the present embodiment is provided, the required strength, the form, and the like.

(2nd embodiment)

Next, a second embodiment of the present invention will be described below with reference to FIGS. 5 and 6. In addition, the same code | symbol is attached | subjected to the same member as 1st Embodiment, and the description is abbreviate | omitted.

The sound absorption structure which concerns on this embodiment has the closing plate 1 and the uneven plate 2 as shown in FIG. The uneven plate 2 has a flat concave portion 4 and a plurality of convex portions 3. A plurality of openings 5 are formed in the recesses 4. The hollow part 6 is formed between the blocking plate 1 and the uneven plate 2. The hollow portion 6 is provided with a first porous plate 31 and a second porous plate 32. The first porous plate 31 has a plurality of through holes 31a and 32a, and is fitted with fitting projections 31b and 32b.

The fitting convex portions 31b and 32b are arranged so as to be in a positional relationship corresponding to the arrangement position of the convex portion 3, and the outer shape supported by the side portions 3b and the top portion 3a of the convex portion 3. It is set to a cone shape with different depths. That is, the fitting convex portions 31b and 32b have a depth different from that of the first porous plate 31 close to the sound source side and the second porous plate 32 far from the sound source side, that is, the first porous plate 31. The depth of the fitting convex part 31b is larger than the depth of the fitting convex part 32b of the 2nd porous board 32. As shown in FIG. The first and second porous plates 31 and 32 are fitted with convex portions 31b and 32b having different depths, and the side portions 3b of the convex portion 3b are fitted during the fitting. By contacting and supporting at the top and top portions 3a, respectively, the layer thicknesses d1, d2, d3 of the division spaces 8, 9, 10 are set. As with the first embodiment, each of the porous plates 31 and 32 may be provided at equal intervals so that the layer thicknesses d1, d2, and d3 are equal, or may be provided at uneven intervals so as to be uneven. The other structure is the same as that of 1st Embodiment, and the structure which applied the structure of the above-mentioned 1st Embodiment, the structure of the modified example, etc. suitably may be applied.

In the above configuration, a method for producing a sound absorbing structure will be described.

As shown in Fig. 6, a sound absorbing structure is prepared with parameters determined by the method of the first embodiment in advance. Specifically, a metal plate such as iron or aluminum is pressed, the opening 5 is punched, and the convex portion 3 is formed, thereby forming the uneven plate 2. Moreover, the metal plate in which through-hole 31a, 32a of the small diameter was formed previously is prepared, and the fitting convex part 31b, 32b is formed by press work like the uneven | corrugated board 2, respectively, and the 1st porous plate ( 31) and the second porous plate 32 are created, respectively. In addition, the through holes 31a and 32a may be formed by press working simultaneously with the fitting projections 31b and 32b.

Next, the first porous plate 31 is covered from above the uneven plate 2, and the convex portion 3 is fitted to the fitting convex portion 31b. And when the fitting convex part 31b contacts and is supported by the top part 3a and the side part 3b of the convex part 3, the 2nd porous plate 32 is continued above the 1st porous plate 31 continuously. Is covered from Then, the fitting projections 31b of the first porous plate 31 are fitted to the fitting projections 32b of the second porous plate 32, whereby the first porous plate 31 and the second porous plate 31. 32 is positioned and fixed. In addition, the fixing may be performed by a bonding material. Thereafter, the blocking plate 1 is mounted on the fitting convex portion 32b of the second porous plate 32 and fixed with an adhesive or the like. As a result, the fitting projections 31b and 32b having different sizes are fixed to the projections 3 while the first and second porous plates 31 and 32 are closed at the top of the fitting projections 32b. By fixing the board 1, the sound absorbing structure having the division spaces 8, 9, and 10 of the layer thicknesses d1, d2, and d3 is easily created with high precision. The other manufacturing method is the same as that of 1st Embodiment.

According to the sound absorbing structure manufactured and configured as described above, as in the case of the first embodiment, since the noise components of the peripheral bands of the plurality of resonance frequencies are absorbed at a high sound absorption rate, main and wide frequencies at which sound sources such as engines are generated The noise of the band can be isolated.

(Third embodiment)

Next, a third embodiment of the present invention will be described below with reference to FIG. In addition, the same code | symbol is attached | subjected to the same member as 1st Embodiment, and the description is abbreviate | omitted.

As shown in FIG. 7, the sound absorbing structure according to the present embodiment includes an uneven plate 2 having a plurality of openings 5 in the convex portion 3 and the concave portion 4, and the uneven plate 2. A plurality of porous plates 41 are provided in the hollow portion 6 formed of the joined opening 5. In addition, like the first embodiment, the porous plate 41 includes a plurality of through holes 41a and a support hole 41b set to a hole diameter corresponding to each layer. In addition, the plurality of porous plates 41 may be provided at equal intervals or may be provided at uneven intervals. In addition, the hollow portion 6 is provided with a thin film sound absorbing body 44. In addition, the thin film sound absorbing body 44 may be provided between the plurality of porous plates 41, or may be between the porous plate 41 and the uneven plate 2, or between the porous plate 41 and the blocking plate 1, It is desirable to be in an optimum arrangement state according to the sound source to be absorbed.

The thin film sound absorbing body 44 is composed of two thin films 42 and 43. The surfaces of the thin films 42 and 43 are formed in a planar shape, and these surfaces are slightly separated from each other, and are adjacent to each other in contact with each other during vibration. The thin films 42 and 43 may be thin films made of metal such as aluminum foil or thin films made of resin such as vinyl chloride, but are not limited thereto. The other structure is the same as that of 1st Embodiment, and the structure which applied the structure of the above-mentioned 1st Embodiment, the structure of the modified example, etc. suitably may be applied.

As described above, the sound absorbing structure of the present embodiment is configured such that at least one thin film sound absorbing member 44 (foil) is vibrated or frictionally provided in at least one of the division spaces in which the hollow portions 6 are divided. According to this structure, in addition to the operation | movement which exhibits the sound absorption performance similar to 1st Embodiment, one film | membrane 42 and 43 vibrate by the incident of a sound wave, and both film | membrane 42 and 43 accompanies by this. By contacting and rubbing, sound wave energy can be consumed. Thereby, compared with the structure which dissipates an engine using a resonance phenomenon, the sound absorption performance excellent in a wide band can be exhibited. In addition, since the sound absorbing structure can use the thin film sound absorbing body 44 made of metal, such as aluminum foil, and resin, such as vinyl chloride, compared with difficult recycling materials, such as glass wool, which had to be disposed of as grinder dust etc. conventionally, This is easy.

In addition, the thin films 42 and 43 may be laminated so that the said thin film has many small convex parts and contact | connects another thin film by the convex part. In this case, when sound waves are incident, the thin films 42 and 43 vibrate, and the polymerized portions come into contact with each other to cause friction, so that energy dissipation of sound waves can be generated and sound absorption can be realized.

Further, the thin films 42 and 43 of the thin film sound absorbing body 44 may have fine through holes formed in the thickness direction, and both of these holes may overlap when viewed in the lamination direction of both thin films 42 and 43, It may be formed in the position which does not overlap. In the case of overlapping, the thin films 42 and 43 vibrate and rub, thereby exhibiting excellent noise effects in a wide band, and also sound waves are attenuated when the sound waves pass through the through-holes. You can.

In addition, when the through-holes of one thin film 42, 43 are formed in a position not overlapping with the through-holes of the other thin film 43, 42, the sound wave is one thin film 43 from the incident side. It passes through the through hole of and passes through the through hole of the other thin film 42 between two thin films 42 and 43, and falls out. Therefore, since the sound waves propagate along the inner surfaces of the two thin films 42 and 43, the attenuation action when passing through the through hole and the viscous attenuation when the sound waves propagate through the surface of the thin films 42 and 43 In addition to the action, the noise effect is further exerted. Further, in the thin film sound absorbing body 44, the through hole is a fine hole, so that the damping effect is further excellent, and the improvement of the noise effect is remarkable. In addition, the thin film sound absorbing body 44 may not have a through hole.

In addition, instead of having a convex portion, the thin film sound absorbing body 44 may be folded so as to have overlapping portions while being in contact with each other. In this case, acoustic energy can be consumed by contacting and rubbing the polymerization sites with each other, and a high sound absorption rate can be realized in a wide band. Further, even if the two thin films 42 and 43 are reduced to one sheet, the sound absorbing structure can be achieved in the polymerized portion, so that the cost can be reduced.

Moreover, in this embodiment, although it is the sound absorption structure provided with the porous board 41 and the thin film sound absorbing body 44, since the thin film sound absorbing body 44 itself has a sound absorption effect, even if it is the sound absorption structure provided with only the thin film sound absorbing body 44, good. 12, the thin film sound absorbing body 45 may be provided in the open portion 7 surrounded by the top portion 3a and the side portion 3b of the convex portion 3, as shown in FIG. good. In this case, the thin film sound absorbing body 45 may be the same porous plate as the porous plate 41, or both the thin film sound absorbing body 45 and the porous plate may be provided.

(4th embodiment)

Next, a fourth embodiment of the present invention will be described below with reference to FIG. In addition, the same code | symbol is attached | subjected to the same member as 1st Embodiment and 3rd Embodiment, and the description is abbreviate | omitted.

As shown in FIG. 8, the sound absorption structure which concerns on this embodiment has the uneven | corrugated board 2 which has many opening parts 5 in the convex part 3 and the recessed part 4, and this uneven plate 2 A plurality of porous plates 41 are provided in the hollow portion 6 formed of the joined opening 5. In addition, similarly to the third embodiment, the plurality of porous plates 41 may be provided at equal intervals or may be provided at uneven intervals. In addition, the sound absorbing material 51 is provided in the hollow part 6. The sound absorbing material 51 is provided in arbitrary site | parts (division space) of the hollow part 6. For example, it is provided in the whole or one part between the porous board 41 and the blocking plate 1, between the porous boards 41 and 41, and between the porous board 41 and the uneven plate 2. In addition, the site | part in which the sound absorption material 51 is provided may be same or different in each hollow part 6.

The sound absorbing material 51 is made of a porous body. The porous body may be formed by compressing metal fibers or strip metals such as aluminum, stainless steel, glass wool, PET fibers, or the like, or may be made of nonwoven fabric. Moreover, the foam of a metal or resin material may be sufficient. In addition, it is preferable that the porous body is formed of the same metal so that good recycling property can be obtained as long as the blocking plate 1 and the uneven plate 2 are made of metal. The other structure is the same as that of 1st Embodiment and 3rd Embodiment, and the structure which applied the structure of the above-mentioned 1st Embodiment and 3rd Embodiment, the structure of the modified example, etc. suitably may be applied.

According to the above structure, the sound absorbing structure 51 can absorb the noise of a band wider than the frequency band sufficiently absorbed by the Helmholtz resonance principle, so that the sound insulation performance can be further improved.

In addition, in this embodiment, only the sound absorbing material 51 is provided in the hollow part 6, It is not limited to this, You may provide like the thin film sound absorbing body 44 of 3rd Embodiment. The sound absorbing structure may have a configuration in which the sound absorbing material 51 is provided around the uneven plate 2. As in the first embodiment, as shown in FIG. 13, the sound absorbing material 52 may be provided in the open part 7 surrounded by the top part 3a and the side part 3b of the convex part 3.

(5th embodiment)

Next, a fifth embodiment of the present invention will be described below with reference to FIG. In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment-4th Embodiment, and the description is abbreviate | omitted.

As shown in FIG. 14, the sound absorption structure which concerns on this embodiment opposes the plate-shaped interior plate 2a (built-in member) which has many opening parts 5 at intervals, and spaced apart from this interior plate 2a. It has a blocking plate 1 (exterior member), and a connecting member 13 which connects the interior plate 2a and the blocking plate 1 to form the hollow part 6. The blocking plate 1 and the interior plate 2a are plate members, and are metals such as iron and aluminum, resin materials, and foils. The connecting member 13 is formed in the column shape which has the flat top part 13a and the side part 13b provided in the periphery of the top part 13a. That is, it is the structure similar to the convex part 3 of 1st Embodiment. And the hollow part 6 is formed between each connecting member 13 by connecting the top board 13a and the blocking plate 1, and connecting the built-in board 2a and the blocking plate 1 to each other. In addition, the connecting member 13 may have a shape without the top 13a, that is, a cylindrical shape having only the side portions 13b.

The hollow part 6 communicates with the external space through the opening 5, and the hollow part 6 is provided with a first porous plate 61 and a second porous plate 62 (second partition member). have. The first and second porous plates 61 and 62 have a plurality of through holes 61a and 62a, are arranged in parallel to the interior plate 2a, and the hollow portion 6 is divided into three layers. (8, 9, 10) are partitioned in this order from the sound source side. In addition, each of the porous plates 61 and 62 may be provided at equal intervals so as to equalize the thickness layers of the division spaces 8, 9, and 10, or may be provided at equal intervals so as to make the thickness layers uneven. In addition, since operation | movement of such a sound absorption structure is the same as that of 1st Embodiment, description is abbreviate | omitted.

Thus, the sound absorption structure of this embodiment is the interior plate 2a (interior member) provided with the opening part 5, the blocking plate 1 (exterior member) arrange | positioned facing at intervals with the interior plate 2a, A connecting member 13 which connects the interior plate 2a and the closure plate 1 to form a hollow portion 6 communicating with the external space through the opening 5, and two hollow portions 6. It is set as the structure provided with the 1st and 2nd porous plates 61 and 62 (2nd partition member) which divide into the above-mentioned partition space. According to this configuration, it is possible to obtain an effect of obtaining excellent sound absorption performance in which a frequency band with a high sound absorption rate is expanded as in the first embodiment. In addition, by constituting the connecting member 13 and the built-in plate 2a separately, the connecting member 13 can be constituted by separate members.

In addition, although the connecting member 13 of this embodiment is made into the column shape, other shapes may be sufficient, and what is necessary is just to form the hollow part 6 by connecting the blocking plate 1 and the interior plate 2a. For example, it may be a cylindrical shape having a cone shape or a polygonal cross section. In addition, the connecting member 13 shown in FIG. 14 may be used as a plate shape. In the case of making the connecting member 13 into a plate shape, as shown in Fig. 15, the first porous plates 61 and 62 may be provided between the connecting members 13 and 13. In this case, a higher sound absorption rate can be obtained. Moreover, you may provide two or more porous plates. In this case, since the large number of division spaces 8, 9, and 10 are formed by the porous plate 21, more numerous peak frequencies can be realized and the sound absorption performance can be widened. In addition, although the perforated plates 61 and 62 are provided in the hollow part 6, they are in the open part enclosed by the top part 13a and the side part 13b of the connection member 13 adjacent to the hollow part 6 ,. You may make a trial. In addition, although the blocking plate 1 and the interior plate 2a are made into flat form, they may have unevenness | corrugation and a curved surface locally. In addition, a part may have a step.

In addition, the inner plate 2a and the connecting member 13 may be integrated into one member. That is, the interior plate 2a is a concave-convex plate having an uneven portion formed by the connecting member 13 and integrated with the connecting member 13, and the closing plate 1 is joined to close one side of the uneven portion. good. In this case, since the interior plate 2a and the connection member 13 can be manufactured at once, a sound absorption structure can be manufactured easily. In this case, an opening having the same width as that of the opening of the connecting member 13 is provided in the interior plate 2a so that the open portion surrounded by the top portion 13a and the side surface 13b of the connecting member 13 is opened. Also good. In addition, the connecting member 13 may be configured by bending the closing plate 1, the interior plate 2a, the porous plates 61, 62, and the like. In addition, a plurality of through holes may be provided in the connecting member 13, and in this case, resonance occurring in a direction parallel to the closing plate 1 or the interior plate 2a can be prevented. Moreover, the damping effect can be improved when passing through the through hole.

In addition, as described in the fourth embodiment, the sound absorbing members 51 and 52 may be disposed in any one of the divided spaces 8, 9 and 10 of the hollow portion 6. In addition, the first porous plates 61 and 62 may be metal foil, the thin films 42 and 43 described in the third embodiment, or the like. In this case, the metal foil and the thin film may or may not have a through hole. In addition, the structure which suitably applied the structure of the above-mentioned 1st-embodiment, the structure of the modified example, etc. may be sufficient.

In the above configuration, a method for producing a sound absorbing structure will be described. Moreover, the manufacturing method demonstrated below is a manufacturing method of the sound absorption structure in which the board | substrate 2a and the connection member 13 are integrated, and the connection member 13 forms an uneven part.

First, similarly to the manufacturing method of 1st Embodiment, each parameter (thickness layer of division space 8, 9, 10, the hole diameter of opening part 5, etc.) is calculated | required. Next, a sound absorbing structure is created with the parameters obtained as shown in FIG. Specifically, a metal plate such as iron or aluminum having a predetermined thickness is prepared, and set in a press working machine. Then, the metal plate is pressed and the opening portion 5 is punched, and at the same time, the connecting member 13 (normal portion 13a and side surface portion 13b) is formed, whereby the interior plate 2a is produced. Moreover, the metal plate in which the through-hole 61a, 62a of the small diameter was formed previously is prepared, and the support hole 61b, 62b is formed by press working like the interior plate 2a, respectively, and the 1st porous plate 61 is made, respectively. And a second porous plate 62 are created, respectively.

The connecting member 13 and the supporting holes 61b and 62b are formed to be longer in one direction as shown in FIG. In addition, the connecting member 13 has a shape that gradually decreases in diameter in a direction away from the metal plate. The support holes 61b and 62b can insert the connecting member 13, and have a size that the side surface 13b of the connecting member 13 engages during insertion. In addition, the through holes 61a and 62a may be formed by press working simultaneously with the support holes 61b and 62b.

Next, after the interior plate 2a is set on the die, the first porous plate 61 is covered from above the interior plate 2a, and the connecting member 13 is inserted through the support hole 61b. do. Then, when the support hole 61b contacts and is supported by the side surface portion 13b of the connecting member 13 during the penetration, the first porous plate 61 is pressed from the upper side at a predetermined pressure in the direction of the interior plate 2a. The supporting hole 61b is fixed by being pressed against the connecting member 13. Moreover, in order to make a fixation reliable, the contact part of the connection member 13 and the support hole 61b may be fixedly attached by adhesive material or welding, and may be fastened by screwing. In addition, the hollow part 6 may be completely sealed by the blocking plate 1 and the interior plate 2a, and when the adhesive part of the blocking plate 1 and the top part 13a has only one point, it is fully sealed. You do not have to. In other words, the adjacent hollow portions 6 may be in communication with each other through a gap generated between the occlusion plate 1 and the top 13a.

Subsequently, the second porous plate 62 is covered from above the first porous plate 61, and the second porous plate 62 is connected by the connecting member 13 during insertion through as in the case of the first porous plate 61. The support hole 62b of 62 is supported and fixed. And the blocking plate 1 is mounted in the top part 13a of the connection member 13 which protruded from the support hole 62b of the 2nd porous board 62, and is fixed by an adhesive material etc .. Thereby, the first and second porous plates 61 and 62 are connected to each other at the same time that the supporting holes 61b and 62b having different diameters are respectively fixed to the side portions 13b of the connecting member 13 to different portions. By the closure plate 1 being fixed to the top part 13a of 13), the sound absorption structure which has the division space 8, 9, 10 of layer thickness is made easy, and is made highly accurate.

As described above, the method for manufacturing the sound absorbing structure of the present embodiment includes a built-in plate 2a (built-in member) having an opening 5 and a closed plate 1 disposed to be spaced apart from the built-in plate 2a ( Exterior member), a connecting member 13 which connects the interior plate 2a and the closure plate 1 to form a hollow portion in communication with the external space through the opening 5, and the hollow portion 6 at least two. Perforated plates 61 and 62 (second partition members) for partitioning into second partition spaces, the interior plate 2a is integrated with the connecting member 13, and the uneven portion formed by the connecting member 13 is provided. It is a concave-convex plate which has, and the obstruction plate 1 is a manufacturing method of the sound absorption structure which is the obstruction plate joined so that one side of the uneven part may be closed, The support holes 61b and 62b are formed in the porous plates 61 and 62, and the said The perforated plate 6 is inserted by penetrating the support holes 61b and 62b into the convex portion of the uneven plate, and supporting and fixing the support hole by the convex portion during insertion. 1 and 62 are provided in the hollow part 6.

Moreover, as a modification of the manufacturing method of this embodiment, as shown in FIG. 17 similarly to the manufacturing method in 2nd embodiment, it fits in the 1st porous board 61 and the 2nd porous board 62. FIG. The convex portions 61c and 62c may be formed. Specifically, a metal plate such as iron or aluminum is pressed, the opening 5 is punched, and the connecting member 13 is formed, whereby the interior plate 2a is created. In addition, the connecting member 13 has a flat plate shape formed from one end to the other end of the metal plate. Moreover, the metal plate in which the through-hole 61a, 62a of the small diameter was formed previously is prepared, and the fitting convex part 61c, 62c is formed by press working like the interior plate 2a, respectively, and the 1st porous plate ( 61) and the second porous plate 62 are created, respectively. The fitting convex part 61c can fit the connection member 13, and the fitting convex part 62c has the magnitude | size which can fit the connection member 13 and the fitting convex part 61c. In addition, the through holes 16a and 62a may be formed by press working simultaneously with the fitting projections 61c and 62c.

Next, the first porous plate 61 is covered from above the interior plate 2a, and the connecting member 13 is fitted to the fitting convex portion 61c. And when the fitting convex part 61c is contacted and supported by the top part 13a and the side part 13b of the connection member 13, the 2nd porous plate 62 will continue above the 1st porous plate 61, and Is covered from Then, the fitting projection 61c of the first porous plate 61 is fitted to the fitting projection 62c of the second porous plate 62, whereby the first porous plate 61 and the second die are The trial plate 62 is positioned and fixed. Moreover, fixing may be performed by an adhesive material. Thereafter, the blocking plate 1 is mounted on the fitting convex portion 62c of the second porous plate 62 and fixed with an adhesive or the like. Thereby, the fitting convex portions 61c and 62c having different sizes (depths) are fixed to the connecting member 13 while the first and second porous plates 61 and 62 are of the fitting convex portion 62c. By fixing the obstruction plate 1 to the government part, the sound absorbing structure having the separation spaces 8, 9, and 10 of the layer thickness is easily and accurately produced. Moreover, when fixing the connecting member 13 in the fitting convex parts 61c and 62c, it differs from the case where the connecting member 13 is fixed in the support holes 61b and 62b, and connects the connecting member 13 to a flat plate. It can be made into shapes, and the sound absorption structure according to a situation can be created.

As described above, another method for manufacturing the sound absorbing structure of the present embodiment includes a built-in plate 2a (built-in member) provided with an opening 5 and a closed plate 1 disposed to face each other at a distance from the built-in plate 2a. (Exterior member), a connecting member 13 which connects the interior plate 2a and the closure plate 1 to form a hollow portion communicating with the external space through the opening 5, and two hollow portions 6 The perforated plates 61 and 62 (2nd partition member) which divide into the above-mentioned 2nd partition space are provided, The interior plate 2a is integrated with the connection member 13, and the unevenness comprised by the said connection member 13 was provided. A concave and convex plate having a portion, and the occlusion plate 1 is a method for producing a sound absorbing structure, which is a concave plate joined to close one of the concave and convex portions, and forms convex portions 61c and 62c fitted to the porous plates 61 and 62. The fitting convex portions 61c and 62c are fitted to the convex portions of the uneven plate, and the fitting convex portions 61c and 62c are fitted by the convex portions during the fitting. By the support and fixing, porous plate (61, 62) is provided in the hollow part (6).

<First Embodiment>

The sound absorption characteristic was simulated about the sound absorption structure of this 1st Embodiment. Specifically, as shown in Fig. 1, the layer thicknesses d1 and d2 of the division spaces 8 and 9 are 8 mm and 8 mm, and the opening ratios of the through holes 11a and 12a of the porous plates 11 and 12 are shown. (β) is 1%, the plate thickness t is 0.3 mm, the hole diameter of the through holes 11a, 12a is 0.5 mm, the opening ratio β of the opening 5 is 7.3%, and the plate thickness t is When the diameter of 0.7 mm and the hole diameter are set to 2 mm, as shown in Fig. 9, in addition to the resonance frequency around 1800 Hz, the resonance frequency is around 4050 Hz and compared with the case where no porous plate is provided. Thus, a plurality of frequencies around the high range has a high sound absorption.

Second Embodiment

The sound absorption characteristic was simulated about the sound absorption structure approximated to this 3rd Embodiment. Specifically, in the case where the double aluminum foil is used as the thin films 42 and 43 of the thin film sound absorbing body 44 while being set to the parameters of the first embodiment, as shown in FIG. 10, the resonance frequency near 1950 Hz is shown. It has a high sound absorption in the range of the resonant frequency around 3200 Hz, and has a very high sound absorption in a very wide range compared with the case where no porous plate is provided.

Since the present invention includes a porous plate that divides the hollow portion into two or more division spaces, it has the advantage that excellent sound absorption performance in which the frequency band with a high sound absorption rate is expanded can be obtained.

Claims (39)

Uneven plate provided with uneven portion and opening, A blocking plate bonded to the uneven plate to form a hollow portion communicating with the outer space through the opening by closing the concave portion of the uneven portion; And a first partition member for partitioning the hollow portion into two or more first division spaces. The sound absorbing structure according to claim 1, wherein the concave-convex plate is provided with a closing member for closing an opening of an open portion in which one side adjacent to the hollow portion is opened. The sound absorbing structure according to claim 1, wherein the uneven plate includes a third partition member for partitioning an open portion, one of which is adjacent to the hollow portion, into two or more third division spaces. . The sound absorption structure according to claim 1, wherein the first partition member has a porous plate having a plurality of through holes. The sound absorption structure according to claim 3, wherein the third partition member has a porous plate having a plurality of through holes. The sound absorbing structure according to claim 1, wherein the first partition member has a foil provided to vibrate or rub. The sound absorption structure according to claim 3, wherein the third partition member has a foil provided to be vibrable or frictional. 7. The sound absorption structure according to claim 6, wherein the foil has a plurality of through holes. The sound absorption structure according to claim 7, wherein the foil has a plurality of through holes. The sound absorption structure according to claim 6, wherein the foil has irregularities. The sound absorption structure according to claim 7, wherein the foil has irregularities. The sound absorbing structure according to claim 1, wherein a sound absorbing material is provided in at least one of the first division spaces divided into two or more. The sound absorption structure of Claim 3 in which the sound absorption material is provided in at least one of the said 3rd division space partitioned into two or more. The sound absorption structure according to claim 1, wherein only one of the first division spaces divided into two or more is in communication with the external space. The sound absorption structure according to claim 3, wherein only one of the third division spaces divided into two or more is in communication with the external space. A built-in member having an opening, An exterior member disposed to face the interior member at intervals; A connection member connecting the interior member and the exterior member to form a hollow portion communicating with an external space through the opening; And a second partition member for partitioning the hollow portion into two or more second partition spaces. The method of claim 16, wherein the built-in member, It is an uneven plate which integrates with the said connection member and has an uneven part comprised by the said connection member, The exterior member, A sound absorbing structure, characterized in that it is a blocking plate joined to close the recessed portion of the uneven portion. 18. The sound absorbing structure according to claim 17, wherein the concave-convex plate is provided with a closing member for closing an opening of an open portion in which one adjacent to the hollow portion is opened. 18. The sound absorbing structure according to claim 17, wherein in the concave-convex plate, a third partition member is provided which partitions an open portion, one of which is adjacent to the hollow portion, into two or more third division spaces. . The sound absorbing structure according to claim 16, wherein the second partition member has a porous plate having a plurality of through holes. The sound absorbing structure according to claim 19, wherein the third partition member has a porous plate having a plurality of through holes. The sound absorbing structure according to claim 16, wherein the second partition member has a foil provided to be vibratory or frictional. 20. The sound absorbing structure of claim 19, wherein the third partition member has a foil provided to be vibrable or frictional. 23. The sound absorbing structure of claim 22, wherein the foil has a plurality of through holes. The sound absorption structure according to claim 23, wherein the foil has a plurality of through holes. The sound absorption structure according to claim 22, wherein the foil has irregularities. The sound absorption structure according to claim 23, wherein the foil has irregularities. The sound absorbing structure according to claim 16, wherein a sound absorbing material is provided in at least one of the second division spaces divided into two or more. The sound absorbing structure according to claim 19, wherein a sound absorbing material is provided in at least one of the third division spaces divided into two or more. The sound absorbing structure according to claim 16, wherein only one of the second division spaces divided into two or more portions communicates with the external space. 20. The sound absorbing structure according to claim 19, wherein only one of the third division spaces divided into two or more portions communicates with the external space. An uneven plate having an uneven portion and an opening portion, a blocking plate joined to the uneven plate to form a hollow portion communicating with the external space through the opening portion by closing the recessed portion of the uneven portion, and the hollow portion having two or more agents. It is a manufacturing method of the sound absorption structure provided with the 1st partition member which divides into 1 division space, The first partition member is formed by forming a support hole in the first partition member, inserting the support hole through the convex portion of the uneven plate, and supporting and fixing the support hole by the convex portion during insertion. It is provided in the said hollow part, The manufacturing method of the sound absorption structure characterized by the above-mentioned. 33. The method of manufacturing a sound absorbing structure according to claim 32, wherein a plurality of through holes are provided in the first partition member. An uneven plate having an uneven portion and an opening portion, a blocking plate joined to the uneven plate to form a hollow portion communicating with the external space through the opening portion by closing the recessed portion of the uneven portion, and the hollow portion having two or more agents. It is a manufacturing method of the sound absorption structure provided with the 1st partition member which divides into 1 division space, The first partition by forming a fitting convex portion on the first partition member, fitting the fitting convex portion to the convex portion of the uneven plate, and supporting and fixing the fitting convex portion by the convex portion during the fitting. A member is provided in the said hollow part, The manufacturing method of the sound absorption structure characterized by the above-mentioned. 35. The method of manufacturing a sound absorbing structure according to claim 34, wherein a plurality of through holes are provided in the first partition member. An interior member having an opening, an exterior member spaced apart from the interior member, a connecting member connecting the interior member and the exterior member to form a hollow portion communicating with the external space through the opening; And a second partition member for partitioning the hollow portion into two or more second partition spaces, wherein the built-in member is an uneven plate having an uneven portion formed by the connecting member and integrated with the connecting member, wherein the exterior member is formed as described above. It is a manufacturing method of the sound absorption structure which is a closed plate joined so that the recessed part of the uneven part may be closed, The second partition member is formed by forming a support hole in the second partition member, inserting the support hole through the convex portion of the uneven plate, and supporting and fixing the support hole by the convex portion during insertion. It is provided in the said hollow part, The manufacturing method of the sound absorption structure characterized by the above-mentioned. The method of manufacturing a sound absorbing structure according to claim 36, wherein a plurality of through holes are provided in the second partition member. An interior member having an opening, an exterior member spaced apart from the interior member, a connecting member connecting the interior member and the exterior member to form a hollow portion communicating with the external space through the opening; And a second partition member for partitioning the hollow portion into two or more second partition spaces, wherein the built-in member is an uneven plate having an uneven portion formed by the connecting member and integrated with the connecting member, wherein the exterior member is formed as described above. It is a manufacturing method of the sound absorption structure which is a closed plate joined so that the recessed part of the uneven part may be closed, The second partition by forming a fitting convex portion on the second partition member, fitting the fitting convex portion to the convex portion of the uneven plate, and supporting and fixing the fitting convex portion by the convex portion during the fitting. A member is provided in the said hollow part, The manufacturing method of the sound absorption structure characterized by the above-mentioned. The method of manufacturing a sound absorbing structure according to claim 38, wherein a plurality of through holes are provided in the second partition member.

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