JP2005099789A - Sound absorbing structure and method of producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enlarge a peak frequency for high sound absorption coefficient. <P>SOLUTION: The sound absorbing structure comprises a concave-convex plate 2 having a convex section 3, a concave section 4 and an opening 5, a closure plate 3 joined to the concave-convex plate 2 in such a manner as to form a hollow portion 6 communicating with the outside space through the opening 5 by closing the convex section 3 or concave section 4, and first and second porous plates 11, 12 having a number of through holes 11a, 12a and serving to divide the hollow portions 6 into two or more divisional spaces. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sound-absorbing structure suitable for structural members, panels, and soundproof covers for automobiles, railway vehicles, buildings, general-purpose machines, etc., and to a method for manufacturing the same. Is.

  Conventionally, as described in Patent Document 1 below, by installing a perforated plate on the lower surface side of the panel via an air layer, and adjusting the thickness of the perforated plate, the diameter of the holes, the pitch, and the thickness of the air layer A sound absorbing member for a vehicle that absorbs noise in a predetermined frequency range is 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 Helmholtz resonance principle. is there.

JP-A-6-298014

  However, the above-described conventional configuration has a problem that the sound absorption coefficient increases only in the vicinity of the Helmholtz resonance frequency, and it is difficult to achieve a wide sound absorption performance.

  According to a first aspect of the present invention, the concavo-convex plate is formed by closing one of the concavo-convex portions with a concavo-convex plate having a concavo-convex portion and an opening, and a hollow portion communicating with the external space through the opening. It is the structure provided with the obstruction board joined to the board, and the 1st partition member which partitions off the said hollow part into two or more 1st division spaces. According to this configuration, it is possible to obtain excellent sound absorption performance in which a frequency band having a high sound absorption rate is expanded.

  Moreover, 2nd invention connects the interior member provided with the opening part, the exterior member arrange | positioned facing the said interior member at intervals, the said interior member, and the said exterior member, The said opening part is connected. And a second partition member that partitions the hollow portion into two or more second partition spaces. According to this configuration, it is possible to obtain excellent sound absorption performance in which a frequency band having a high sound absorption rate is expanded.

  Moreover, 3rd invention is an uneven | corrugated board in which the interior member of 2nd invention is integrated with the said connection member, and has the uneven part comprised by this connection member, The said exterior member is one side of the said uneven part It is the obstruction board joined so that may be obstruct | occluded. According to this configuration, the sound absorbing structure can be easily manufactured by integrating the interior member and the connecting member.

  Moreover, 4th invention is a structure provided with the obstruction | occlusion member which plugs up the said opening of the open part in which the said concavo-convex board of 1st or 3rd invention opens the one adjacent to the said hollow part. Furthermore, a fifth invention is the first plate according to the first, third, or fourth invention, wherein the open portion adjacent to the hollow portion is divided into two or more third partitioned spaces. It is the structure provided with 3 partition members. According to this configuration, a higher sound absorption rate can be obtained.

  Moreover, in order to obtain the outstanding sound absorption performance in which the 6th invention expanded the frequency band with a high sound absorption coefficient, the said 1st, 2nd and 3rd partition member of any one of the 1st-5th invention is provided. At least one has a configuration including a porous plate having a large number of through holes. According to a seventh aspect of the invention, at least one of the first, second, and third partition members according to any one of the first to fifth aspects has a foil provided so as to be vibrated or rubbed. It may be configured. In this case, the foil may have a large number of through holes (eighth invention), or the foil may have an uneven portion (ninth invention).

  Further, a tenth aspect of the invention is a configuration in which, in the first to ninth aspects, a sound absorbing material is provided in at least one of the first, second, and third partitioned spaces partitioned into two or more. is there. According to this configuration, it is possible to obtain excellent sound absorption performance in which the frequency band having a high sound absorption rate is further expanded.

  An eleventh aspect of the invention is a configuration in which, in the first, fourth to tenth aspects, only one of the first partitioned spaces partitioned into two or more is in communication with the external space. In a twelfth aspect, in the second to tenth aspects, only one of the second partitioned spaces partitioned into two or more is in communication with the external space. According to a thirteenth aspect, in the fifth to twelfth aspects, only one of the third partitioned spaces partitioned into two or more is in communication with the external space. This simplifies the configuration.

  Further, the present invention provides the concavo-convex plate having the concavo-convex plate having the concavo-convex portion and the opening and the hollow portion communicating with the external space through the opening by closing one of the concavo-convex portions. A sound absorbing structure comprising: a closing plate joined to the partition wall; and a partition member that partitions the hollow portion into two or more first partition spaces, wherein a support hole is formed in the partition member, and the support The porous plate is provided in the hollow portion by inserting a hole through the convex portion of the concavo-convex plate and supporting and fixing the support hole by the convex portion during insertion. Further, the present invention provides the concavo-convex plate having the concavo-convex plate having the concavo-convex portion and the opening and the hollow portion communicating with the external space through the opening by closing one of the concavo-convex portions. A sound-absorbing structure comprising: a closing plate joined to the partition plate; and a partition member that partitions the hollow portion into two or more first partition spaces, wherein a fitting convex portion is formed on the partition member, The fitting projection is fitted to the projection of the concavo-convex plate, and the support member is supported and fixed by the projection during the fitting, thereby providing the partition member in the hollow portion.

  Further, the present invention provides an interior member provided with an opening, an exterior member disposed opposite to the interior member with a space therebetween, and connects the interior member and the exterior member via the opening. A connecting member that forms a hollow portion that communicates with an external space; and a second partition member that partitions the hollow portion into two or more second partition spaces, wherein the interior member is integrated with the connecting member, It is a concavo-convex plate having a concavo-convex portion constituted by a member, and the exterior member is a method for producing a sound absorbing structure which is a closing plate joined so as to close one of the concavo-convex portions, A support hole is formed in the partition member, the support hole is inserted into the convex portion of the concavo-convex plate, and the support hole is supported and fixed by the convex portion during insertion, whereby the second partition member is It is the structure provided in a part. Further, the present invention provides an interior member provided with an opening, an exterior member disposed opposite to the interior member with a space therebetween, and connects the interior member and the exterior member via the opening. A connecting member that forms a hollow portion that communicates with an external space; and a second partition member that partitions the hollow portion into two or more second partition spaces, wherein the interior member is integrated with the connecting member, It is a concavo-convex plate having a concavo-convex portion constituted by a member, and the exterior member is a method for producing a sound absorbing structure which is a closing plate joined so as to close one of the concavo-convex portions, By forming a fitting convex portion on the partition member, fitting the fitting convex portion to the convex portion of the concavo-convex plate, and supporting and fixing the fitting convex portion by the convex portion during the fitting, The second partition member is provided in the hollow portion. Further, at least one of the first and second partition members is provided with a plurality of through holes. Thereby, it is possible to easily and highly accurately create a sound absorbing structure having a partitioned space.

  Since the present invention includes a perforated plate that partitions the hollow portion into two or more divided spaces, it has an advantage that an excellent sound absorbing performance in which a frequency band having a high sound absorption rate is expanded can be obtained.

(Embodiment 1)
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 a moving device including a driving mechanism such as an engine, and a driving mechanism such as a motor and a gear inside, such as an automobile, a railway vehicle, a construction vehicle, a ship, and an automatic conveyance device. It is suitably used as a soundproof cover, a structural member, a panel or a floor, wall, or ceiling of a building machine.

  As shown in FIG. 1, the sound-absorbing structure includes, for example, a flat plate-like closing plate 1 that faces the outside where noise is a problem, and unevenness that faces the sound source that generates noise including a driving mechanism such as an engine. And a plate 2. The closing plate 1 and the concavo-convex plate 2 are formed of a metal such as iron or aluminum or a resin material. The closing plate 1 and the concavo-convex plate 2 are preferably formed of the same material so that the separation process at the time of recycling is unnecessary.

  The concavo-convex plate 2 includes a flat plate-like concave portion 4 and a plurality of convex portions 3 that protrude from the concave portion 4 toward the closing plate 1 and are joined to the closing plate 1. A large number of openings 5 are formed in the recess 4. Further, the convex portions 3 are dispersedly arranged at a predetermined distance. Further, the convex portion 3 may be provided so as to extend from one end to the other end. Further, the opening 5 may be further formed in the convex portion 3.

  The convex portion 3 is formed in a conical shape including a flat top portion 3a and a side surface portion 3b that is inclined while increasing its diameter from the periphery of the top portion 3a. The closing plate 1 is joined to the top 3 a of the protruding portion 3 so as to close the recessed portion 4. Thus, a hollow portion 6 is formed between the closing plate 1 and the concavo-convex plate 2, surrounded by the concave portion 4, the closing plate 1 and the convex portion 3, and communicated with the external space through the opening portion 5. Yes.

  The hollow portion 6 is provided with a first perforated plate 11 and a second perforated plate 12 (first partition member). The first and second first perforated plates 11 and 12 are arranged in parallel to the recess 4 and partition the hollow portion 6 into three layers of divided spaces 8, 9, and 10 in this order from the sound source side. Each of the perforated plates 11 and 12 includes a large number of through holes 11a and 12a, and also includes support holes 11b and 12b. The support holes 11b and 12b are arranged so as to have a positional relationship that coincides with the arrangement position of the convex portion 3, and are set to have a hole diameter supported by the side surface portion 3b of the convex portion 3. That is, the hole diameters of the support holes 11b and 12b differ between 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, the support hole 11b of the first porous plate 11 The hole diameter is larger than the hole diameter of the support hole 12 b of the second porous plate 12. The first and second perforated plates 11 and 12 are in contact with and supported at different portions of the side surface portion 3b of the convex portion 3 while the support holes 11b and 12b having different diameters are inserted into the convex portion 3, respectively. Thus, the layer thicknesses d1, d2, and d3 of the divided spaces 8, 9, and 10 are set, respectively.

  A multi-degree-of-freedom vibration system is formed with the air in each of the divided spaces 8, 9, 10 as a spring and the air in the through holes 11 a, 12 a of the perforated plates 11, 12 as mass. When the sound of the resonance frequency of this resonance system enters through the opening 5, the air in the through holes 11a and 12a of the perforated plates 11 and 12 vibrates violently and has a large sound absorbing force due to friction loss.

  The parameter consisting of the opening ratio β, the plate thickness t, and the hole diameter b of the opening of the concavo-convex plate 2 and at least one member of the through holes 11a and 12a of the first and second perforated plates 11 and 12 has a sound absorption coefficient of 0 alone. A combination that exhibits 3 or more is preferable.

  Furthermore, the parameter consisting of the layer thickness d, the aperture ratio β, the plate thickness t, and the hole diameter b is at least one of the opening 5 of the concavo-convex plate 2 and the through holes 11a and 12a of the first and second porous plates 11 and 12. It is preferably set so as to cause a viscous action on the air passing through the. The reason for this is that when a sound absorbing structure is formed with these parameters, a viscous action is generated on the air to generate vibration and attenuation, and the frequency bandwidth at which the sound absorption coefficient is 0.3 or more is higher than the resonance frequency f. This is because the sound absorption characteristics of 10% or more can be exhibited.

  That is, the parameters of the sound absorbing structure are such that the aperture ratio β of at least one of the concavo-convex plate 2 and the perforated plates 11 and 12 is 3% or less and each plate thickness t is 0.3 mm or more so as to have the above sound absorbing characteristics. In addition, it is preferable that the opening 5 and the hole diameter b of the through holes 11a and 12a are set to a design condition of 0.8 mm or less.

  In addition, the hole diameters of the opening 5 and the through holes 11a and 12a are not particularly limited, but any member is desirably 5 mm or less, preferably 3 mm or less, more preferably 1 mm or less. . Furthermore, the sound absorbing structure may be configured by paying attention only to the hole diameters of the opening 5 and the through holes 11a and 12a. That is, the sound absorbing structure may have a configuration including the first and second perforated plates 11 and 12 having a large number of through holes 11a and 12a having a diameter of 1 mm or less. And when the hole diameter of through-hole 11a * 12a is set to 1 mm or less in this way, a viscous action can be reliably generate | occur | produced in the air which flows through through-hole 11a * 12a.

  In addition, 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 diameter of the through holes 11a and 12a approaches 0, the peak of the sound absorption coefficient is theoretically 1.0, but in reality, it does not reach 1.0, and the diameter is 0.2 mm. This is because, if it is extremely small as described below, the viscosity of the air in the through holes 11a and 12a becomes too large, so that the resistance to the air flow in the through holes 11a and 12a increases and the sound absorption rate is considered to decrease. In addition, if the diameter is extremely small, such as 0.2 mm or less, the manufacturing becomes significantly difficult, and the through holes 11a and 12a are likely to be blocked by dust or dust depending on the use environment.

  Further, the opening 5 and the through holes 11a and 12a may be oval, rectangular, polygonal, or slit-shaped, and various shapes are mixed between and inside the opening 5 and the through holes 11a and 12a. You may do it. Furthermore, the opening 5 and the through holes 11a and 12a may be set to the same size and diameter, and various sizes and diameters are mixed between and inside the opening 5 and the through holes 11a and 12a. May be. When various sizes and diameters are mixed, the frequency bandwidth that exhibits sufficient sound absorption performance can be expanded.

  Moreover, although the sound-absorbing structure in the present embodiment is configured such that the divided spaces 8, 9, and 10 of each layer are arranged in parallel, there is no limitation to this. That is, the divided spaces 8, 9, and 10 of the sound absorbing structure may be divided or partitioned into an arbitrary shape and volume within the hollow portion 6 by a partition member that partitions the hollow portion 6. For example, the perforated plates 11 and 12 may be provided at equal intervals so that the layer thicknesses of the divided spaces 8, 9, and 10 are equal, or provided at unequal intervals so that the layer thicknesses are not uniform. You may do it. In this case, the sound absorption performance can be easily adjusted by changing the partition member.

  In the present embodiment, the perforated plates 11 and 12 are provided in the hollow portion 6, but are surrounded by the top 3a and the side surface 3b of the convex portion 3 adjacent to the hollow portion 6, as shown in FIG. A porous plate 14 (third partition member) and a porous plate 15 (blocking member) may be provided in the opened portion 7. In this case, the porous plate 14 and / or the porous plate 15 may have a structure that rises in the opposite direction to the convex portion 3 in order to make a large air layer. Further, on the contrary, the porous plate 14 and / or the hole plate 15 may have a structure recessed in the direction of the convex portion 3 because the air layer may be thin when absorbing high frequencies. Alternatively, only the porous plate 15 may be provided without providing the porous plate 14. Further, the perforated plates 14 and 15 may be metal foils or thin films. In this case, the metal foil and the thin film may or may not have through holes.

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

  First, it is actually measured or estimated what kind of frequency characteristic the noise to be sound absorption has. The layer thicknesses d1, d2, and d3 are 1 mm to 50 mm, the concavo-convex plate 2 and the first and second porous holes so that the sound absorption characteristics have a sound absorption coefficient of 0.3 or more including a plurality of peak components. The air viscosity is based on the design conditions where the aperture ratio β of the 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 or less. The parameters are determined in consideration.

  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 machine. Then, the metal plate is pressed, and the convex portion 3 is formed at the same time as the opening 5 is punched, whereby the concave-convex plate 2 is created. In addition, a metal plate in which through holes 11a and 12a having small diameters are formed in advance is prepared, and the support holes 11b and 12b are formed by pressing in the same manner as the concavo-convex plate 2, whereby the first porous plate 11 and the second porous plate 11 and Each of the perforated plates 12 is created. The through holes 11a and 12a may be formed by pressing simultaneously with the support holes 11b and 12b.

  Next, after the concavo-convex plate 2 is set on the table, the first porous plate 11 is covered from above the concavo-convex plate 2, and the convex portion 3 is inserted into the support hole 11b. When the support hole 11b is supported in contact with the side surface portion 3b of the convex portion 3 during the insertion, the first perforated plate 11 is pressed from above with a predetermined pressure in the direction of the concave and convex plate 2, thereby supporting holes. 11b is fixed by being press-contacted to the convex part 3. FIG. In order to secure the fixing, the contact portion between the convex portion 3 and the support hole 11b may be fixed by an adhesive or welding, or may be fastened by screwing. Moreover, the hollow part 6 may be in a state of being completely sealed by the closing plate 1 and the concavo-convex plate 2, and when the bonding part between the closing plate 1 and the top 3 a is only one point, it is completely sealed. It does not have to be. That is, the state in which the adjacent hollow portions 6 communicate with each other via a gap generated between the closing plate 1 and the top portion 3a may be used.

  Thereafter, the second perforated plate 12 is covered from above the first perforated plate 11, and the support hole 12 b of the second perforated plate 12 is supported and supported by the projecting portion 3 in the middle of insertion as in the case of the first perforated plate 11. Fixed. Then, the closing plate 1 is placed on the top 3a of the convex portion 3 protruding from the support hole 12b of the second porous plate 12, and is fixed by an adhesive or the like. Thus, the first and second perforated plates 11 and 12 have the support holes 11b and 12b having different diameters fixed at different portions of the side surface portion 3b of the convex portion 3, respectively, and the blocking plate is attached to the top portion 3a of the convex portion 3. By fixing 1, a sound absorbing structure having divided spaces 8, 9, and 10 having layer thicknesses d 1, d 2, and d 3 can be easily and highly accurately created.

  When the perforated plates 14 and 15 are provided in the opening 7, for example, the perforated plates 14 and 15 having different diameters are prepared and installed from the top 3 a side of the convex portion 3 toward the opening in order from the smallest diameter. A sound absorbing structure is created by moving.

  Next, the operation of the sound absorbing structure will be described. When the sound source generates noise, the noise travels and reaches the sound absorbing structure disposed opposite to the sound source. At this time, the sound absorbing structure is formed with the aperture ratio, the thickness of the interior panel, the hole diameter, and the air layer thickness configured to satisfy the required performance, and the sound absorbing characteristics are in the peripheral band of a plurality of resonance frequencies. The three-layered divided spaces 8, 9, and 10 exhibiting a high sound absorption coefficient are provided. Therefore, when noise reaches the sound absorbing structure, the noise components in the peripheral bands of the plurality of resonance frequencies are absorbed with a high sound absorption rate, so that it is possible to absorb main and wide frequency band noise generated by a sound source such as an engine. it can. Thereby, the sound-absorbing structure can absorb the noise of the main wide frequency band.

  As described above, the sound absorbing structure of the present embodiment includes the concavo-convex plate 2 provided with the convex portions 3 and the concave portions 4 (concavo-convex portions) and the opening 5 and the hollow portion communicating with the external space via the opening 5. 6 has a blocking plate 1 joined to the concavo-convex plate 2 so as to be formed by closing one of the convex portion 3 and the concave portion 4, and a plurality of through holes 11a and 12a, and the hollow portion 6 is divided into two or more sections. The first and second perforated plates 11 and 12 are partitioned into 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 closing plate 1 and the recessed portion 4 are formed in a flat plate shape. However, the present invention is not limited to this, and the blocking plate 1 and the recessed portion 4 may locally have unevenness or a curved surface, or have a step in part. You may do it. Further, in the present embodiment, a description will be given of a case in which two perforated plates 11 and 12 are provided in the hollow portion 6 formed by the concave portion 4 and the closing plate 1 while having a plurality of distributed convex portions 3. However, the present invention is not limited to this. That is, as shown in FIG. 3, the concave and convex plate 2 having the convex portion 3 formed so as to surround the periphery of the single concave portion 4 is provided, and three or more hollow portions 6 formed by the concave portion 4 and the closing plate 1 are provided. The structure which provided the porous plate 21 of this may be sufficient. In this case, since a large number of divided spaces 8, 9,..., 10 are formed by the perforated plate 21, an even larger number of peak frequencies can be realized and the sound absorption performance can be broadened. Of course, the number of perforated plates 21 may be one. Further, the through holes 21a of each porous plate 21 are mixed even if various shapes and diameters such as an elliptical shape, a rectangular shape, a polygonal shape, and a slit shape are present between and inside each porous plate 21. May be.

  Furthermore, as shown in FIG. 4, the sound absorbing structure may have a configuration in which the configuration in FIG. 3 is arranged in parallel in a single row or vertical and horizontal matrix. In the case of this configuration, the sound absorption force can be improved. The opening 5 of the concavo-convex plate 2 and the through hole 21a of each porous plate 21 may be the same or mixed in various shapes and diameters between and inside the hollow portions 6 arranged in parallel. May be. Thereby, it is possible to obtain a sound absorption performance with a wider peak frequency. Further, although numerical values such as the aperture ratio β, the thick layer d, and the plate thickness t are specifically described, the numerical values are not limited thereto. These numerical values are determined by the environment in which the sound absorbing structure according to the present embodiment is installed, the required strength, form, and the like.

(Embodiment 2)
Next, a second embodiment of the present invention will be described below with reference to FIGS. In addition, the same code | symbol is attached | subjected to the member same as Embodiment 1, and the description is abbreviate | omitted.

  As shown in FIG. 5, the sound absorbing structure according to the present embodiment includes a closing plate 1 and an uneven plate 2. The concavo-convex plate 2 includes a flat plate-like concave portion 4 and a plurality of convex portions 3. A large number of openings 5 are formed in the recess 4. A hollow portion 6 is formed between the closing plate 1 and the uneven plate 2. The hollow portion 6 is provided with a first perforated plate 31 and a second perforated plate 32. The 1st perforated plate 31 is equipped with many through-holes 31a * 32a and fitting convex part 31b * 32b.

  The fitting convex portions 31b and 32b are arranged so as to have a positional relationship that coincides with the arrangement position of the convex portion 3, and have an outer shape and depth supported by the side surface portion 3b and the top portion 3a of the convex portion 3. Are set to different conical shapes. That is, the fitting convex portions 31b and 32b have different depths between 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 fitting convex portions of the first porous plate 31. The depth of 31 b is larger than the depth of the fitting convex portion 32 b of the second porous plate 32. And these 1st and 2nd perforated plates 31 * 32 are fitting convex part 31b * 32b from which depth differs in the convex part 3, and the side part 3b and top part 3a of the convex part 3 are in the middle of fitting. The layer thicknesses d1, d2, and d3 of the divided spaces 8, 9, and 10 are respectively set by abutting and supporting each other. As with the first embodiment, 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 unequal intervals so as to be non-uniform. Anyway. The other configuration is the same as that of the first embodiment, and may be a configuration to which the configuration of the above-described first embodiment and the configuration of the modified example are appropriately applied.

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

  As shown in FIG. 6, a sound absorbing structure is created with parameters determined in advance by the method of the first embodiment. Specifically, a metal plate such as iron or aluminum is pressed, the opening 5 is punched out, and the convex portion 3 is formed at the same time, whereby the concave / convex plate 2 is created. In addition, a metal plate in which through holes 31a and 32a having small diameters are formed in advance is prepared, and the fitting projections 31b and 32b are formed by pressing as in the case of the concavo-convex plate 2, whereby the first porous plate 31 and Second perforated plates 32 are respectively created. The through holes 31a and 32a may be formed by pressing simultaneously with the fitting convex portions 31b and 32b.

  Next, the first porous plate 31 is covered from above the concavo-convex plate 2, and the convex portion 3 is fitted into the fitting convex portion 31b. And if the fitting convex part 31b is contact | abutted and supported by the top part 3a and the side part 3b of the convex part 3, the 2nd perforated plate 32 will be covered from the upper direction of the 1st perforated plate 31 continuously. The first perforated plate 31 and the second perforated plate 32 are positioned and fixed by fitting the fitting convex portion 31b of the first perforated plate 31 into the fitting convex portion 32b of the second perforated plate 32. . The fixing may be performed with an adhesive. Thereafter, the closing plate 1 is placed on the fitting convex portion 32b of the second porous plate 32 and fixed by an adhesive or the like. As a result, the first and second perforated plates 31 and 32 have the fitting projections 31b and 32b of different sizes (depths) fixed by the projection 3 and the blocking plate 1 on the top of the fitting projection 32b. Is fixed, the sound-absorbing structure having the divided spaces 8, 9, 10 having the layer thicknesses d1, d2, and d3 can be easily and highly accurately created. Other manufacturing methods are the same as those in the first embodiment.

  According to the sound absorbing structure manufactured and configured as described above, the noise components in the peripheral bands of a plurality of resonance frequencies are absorbed with a high sound absorption rate, as in the case of the first embodiment. The main and wide frequency band noises that occur can be isolated.

(Embodiment 3)
Next, Embodiment 3 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 Embodiment 1, 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 large number of openings 5 in the convex portions 3 and the concave portions 4, and an opening portion 5 joined to the uneven plate 2. A plurality of perforated plates 41 are provided in the formed hollow portion 6. As in the first embodiment, the perforated plate 41 has a large number of through holes 41a and a support hole 41b set to a hole diameter corresponding to each layer. Further, the plurality of perforated plates 41 may be provided at regular intervals or at irregular intervals. Further, a thin film sound absorber 44 is provided in the hollow portion 6. The thin-film sound absorber 44 may be provided between the plurality of perforated plates 41, between the perforated plate 41 and the concavo-convex plate 2, or between the perforated plate 41 and the closing plate 1. It is desirable that the optimal arrangement state according to the sound source to be absorbed is good.

  The thin film sound absorber 44 includes two thin films 42 and 43. These thin films 42 and 43 are formed so that the surfaces thereof are planar, and these surfaces are slightly separated from each other and are adjacent to each other so that they can be contacted during vibration. The thin films 42 and 43 can be a metal thin film such as aluminum foil or a resin thin film such as vinyl chloride, but is not limited thereto. The other configuration is the same as that of the first embodiment, and may be a configuration to which the configuration of the above-described first embodiment and the configuration of the modified example are appropriately applied.

  As described above, the sound absorbing structure of the present embodiment is configured such that one or more thin film sound absorbers 44 (foil) are provided in at least one of the divided spaces into which the hollow portion 6 is divided so as to vibrate or rub. ing. According to this configuration, in addition to the operation of exhibiting the same sound absorbing performance as that of the first embodiment, the sound absorbing structure vibrates the two thin films 42 and 43 due to the incidence of sound waves, and accordingly, the both thin films 42 and 43. The sonic energy can be consumed by contacting and rubbing. Thereby, compared with the structure which dissipates energy using a resonance phenomenon, the outstanding sound absorption performance can be exhibited in a wide zone | band. In addition, the sound absorbing structure can be made of metal such as aluminum foil or a thin film sound absorber 44 made of resin such as vinyl chloride. Therefore, it is difficult to recycle such as glass wool, which had to be disposed of as shredder dust. Recycling is easier than

  Note that the thin films 42 and 43 may be laminated so that the thin film has a large number of minute convex portions and is in contact with other thin films by the convex portions. In this case, when a sound wave is incident, the thin films 42 and 43 vibrate, and the overlapping portions come into contact with each other and rub against each other. Therefore, energy dissipation of the sound wave occurs and sound absorption can be realized.

  Further, the thin films 42 and 43 of the thin film sound absorber 44 are formed with fine through holes in the thickness direction, and when these through holes are viewed in the stacking direction of the thin films 42 and 43, both may overlap. However, they may be formed at positions that do not overlap. In the case of overlapping, the thin film 42/43 vibrates and rubs against each other, so that an excellent silencing effect in a wide band can be obtained, and the sound wave is further attenuated when the sound wave passes through the through-hole. The effect can be demonstrated.

  In addition, when the through hole of one thin film 42 or 43 is formed at a position that does not overlap with the through hole of the other thin film 43 or 42, the sound wave passes through the through hole of one thin film 43 from the incident side. Then, it passes between the two thin films 42 and 43, passes through the through hole of the other thin film 42, and comes out. Therefore, since the sound wave propagates along the inner surfaces of the two thin films 42 and 43, the damping action when passing through the through hole and the viscous damping action when the sound wave propagates through the surfaces of the thin films 42 and 43, In combination with this, a further silencing effect is exhibited. Furthermore, the thin-film sound absorber 44 has a more excellent attenuation effect when the above-described through holes are made into fine holes, and the improvement of the silencing effect becomes remarkable. The thin film sound absorber 44 may not have a through hole.

  Further, the thin film sound absorber 44 may be folded so as to have overlapping portions while being in contact with each other, instead of having the convex portions. In this case, the overlapping portions come into contact with each other and rub against each other, so that the sound wave energy can be consumed, and a high sound absorption coefficient can be realized in a wide band. Furthermore, even if the two thin films 42 and 43 are reduced to one, the sound absorbing structure can be achieved at the overlapping portion, so that the cost can be reduced.

  In this embodiment, the sound absorbing structure is provided with the perforated plate 41 and the thin film sound absorber 44. However, since the thin film sound absorber 44 itself has a sound absorbing effect, only the thin film sound absorber 44 is provided. It may be a sound absorbing structure. Furthermore, as in the first embodiment, as shown in FIG. 12, a thin-film sound absorber 45 may be provided in the opening portion 7 surrounded by the top 3a and the side surface 3b of the convex portion 3. In this case, the thin-film sound absorber 45 may be a porous plate similar to the porous plate 41, or both the thin-film sound absorber 45 and the porous plate may be provided.

(Embodiment 4)
Next, Embodiment 4 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 Embodiment 1 and Embodiment 3, and the description is abbreviate | omitted.

  As shown in FIG. 8, the sound absorbing structure according to the present embodiment includes a concavo-convex plate 2 having a large number of openings 5 in the convex portion 3 and the concave portion 4, and an opening portion 5 joined to the concavo-convex plate 2. A plurality of perforated plates 41 are provided in the formed hollow portion 6. Further, as in the third embodiment, the plurality of perforated plates 41 may be provided at regular intervals or at irregular intervals. Further, a sound absorbing material 51 is provided in the hollow portion 6. The sound absorbing material 51 is provided in an arbitrary part (partition space) of the hollow portion 6. For example, it is provided between the porous plate 41 and the closing plate 1, between the porous plates 41 and 41, or between the porous plate 41 and the concavo-convex plate 2. Moreover, the site | part in which the sound absorption material 51 is provided may be the same in each hollow part 6, or may differ.

  The sound absorbing material 51 is made of a porous body. The porous body may be formed by compressing, for example, metal fibers such as aluminum, stainless steel, glass wool, and pet fibers, or a strip-shaped metal, or may be formed of a nonwoven fabric. Moreover, the foam of a metal or a resin material may be sufficient. In addition, as long as the obstruction board 1 and the uneven | corrugated board 2 are metal, it is desirable that the porous body is formed with the same metal so that good recyclability can be obtained. Other configurations are the same as those of the first and third embodiments, and may be a configuration to which the configurations of the first and third embodiments and the modifications thereof described above are appropriately applied.

  According to the above configuration, the sound absorbing structure can absorb noise in a wider band than the frequency band in which the sound absorbing material 51 can be sufficiently absorbed by the Helmholtz resonance principle, so that the soundproofing performance can be further improved. It is.

  In the present embodiment, only the sound absorbing material 51 is provided in the hollow portion 6, but is not limited to this, and may be provided together with the thin film sound absorber 44 of the third embodiment. Further, the sound absorbing structure may have a configuration in which the sound absorbing material 51 is provided around the uneven plate 2. Furthermore, as in the first embodiment, as shown in FIG. 13, a sound absorbing material 52 may be provided in the opening portion 7 surrounded by the top portion 3 a and the side surface portion 3 b of the convex portion 3.

(Embodiment 5)
Next, Embodiment 5 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 Embodiment 1-4, and the description is abbreviate | omitted.

  As shown in FIG. 14, the sound-absorbing structure according to the present embodiment is arranged so as to face a flat interior plate 2a (interior member) having a large number of openings 5 with an interval from the interior plate 2a. It has a closing plate 1 (exterior member), a connecting member 13 that connects the interior plate 2 a and the closing plate 1 to form the hollow portion 6. The closing plate 1 and the interior plate 2a are plate members, such as metals such as iron and aluminum, resin materials, foils, and the like. The connecting member 13 is formed in a cylindrical shape having a flat top portion 13a and a side surface portion 13b provided on the periphery of the top portion 13a. That is, it has the same configuration as the convex portion 3 of the first embodiment. And the hollow part 6 is formed between each connection member 13 by connecting the interior board 2a and the obstruction board 1 so that the top part 13a side may be joined with the obstruction board 1. FIG. The connecting member 13 may have a shape that does not have the top portion 13a, that is, a cylindrical shape that has only the side surface portion 13b.

  The hollow portion 6 communicates with the external space through the opening 5, and the hollow portion 6 is provided with a first perforated plate 61 and a second perforated plate 62 (second partition member). Yes. The first and second first perforated plates 61, 62 are provided with a large number of through holes 61a, 62a and are arranged in parallel to the interior plate 2a, and the hollow portion 6 is divided into three layers of divided spaces 8, 9, 10 in this order from the sound source side. Further, the perforated plates 61, 62 may be provided at equal intervals so as to make the thick layers of the divided spaces 8, 9, 10 uniform, or provided at unequal intervals so as to make the thick layers uneven. Also good. Since the operation of the sound absorbing structure is the same as that of the first embodiment, description thereof is omitted.

  Thus, the sound absorbing structure of the present embodiment includes an interior plate 2a (interior member) provided with the opening 5, a closing plate 1 (exterior member) disposed to face the interior plate 2a at an interval, and the interior. A connecting member 13 that connects the plate 2a and the closing plate 1 to form a hollow portion 6 that communicates with the external space through the opening 5, and a first and a second that partition the hollow portion 6 into two or more partition spaces. It is the structure provided with the perforated plates 61 * 62 (2nd partition member). According to this configuration, as in the first embodiment, it is possible to obtain an effect that it is possible to obtain excellent sound absorption performance in which a frequency band having a high sound absorption rate is expanded. Moreover, it can comprise by a mutually different member by comprising the connection member 13 and the interior board 2a separately.

  In addition, although the connection member 13 of this Embodiment is made into the cylindrical shape, shapes other than this may be sufficient, and if the closure board 1 and the interior board 2a are connected and the hollow part 6 is formed. It ’s fine. For example, a conical shape or a cylindrical shape having a polygonal cross section may be used. Further, the connecting member 13 depicted in FIG. 14 may be plate-shaped. When the connecting member 13 has a plate shape, first porous plates 61 and 62 may be provided between the connecting members 13 and 13 as shown in FIG. In this case, a higher sound absorption rate can be obtained. Further, two or more perforated plates may be provided. In this case, since a large number of divided spaces 8, 9... 10 are formed by the perforated plate 21, an even larger number of peak frequencies can be realized, and the sound absorption performance can be broadened. Further, the perforated plates 61 and 62 are provided in the hollow portion 6, but the perforated plates are provided in the opening portion adjacent to the hollow portion 6 and surrounded by the top portion 13 a and the side surface portion 13 b of the connecting member 13. May be. Moreover, although the obstruction board 1 and the interior board 2a are made into flat form, you may have unevenness | corrugation and a curved surface locally, and may have a level | step difference in part.

  Moreover, you may make it integrate the interior board 2a and the connection member 13 into one member. That is, the interior plate 2a is a concavo-convex plate that is integrated with the connecting member 13 and has a concavo-convex portion constituted by the linking member 13, and the closing plate 1 is joined so as to close one of the concavo-convex portions. There may be. In this case, since the interior board 2a and the connecting member 13 can be manufactured at a time, the sound absorbing structure can be easily manufactured. In this case, the interior plate 2a may be provided with an opening having the same width as the opening portion of the connecting member 13 so that the opening portion surrounded by the top portion 13a and the side surface portion 13b of the connecting member 13 is opened. Furthermore, you may make it comprise the connection member 13 by bending the obstruction | occlusion board 1, the interior board 2a, or the porous board 61 * 62 grade | etc.,. Moreover, you may make it provide a some through-hole in the connection member 13, In this case, the resonance which arises in the direction parallel to the obstruction board 1 and the interior board 2a can be prevented. Moreover, the attenuation effect at the time of passing through a through-hole can be improved.

  Further, as described in the fourth embodiment, the sound absorbing members 51 and 52 may be disposed in any of the divided spaces 8, 9, and 10 of the hollow portion 6. The first perforated 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 through holes. In addition, the structure which applied suitably the structure of Embodiment 1-4 mentioned above, the structure of the modification, etc. may be sufficient.

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

  First, as in the manufacturing method of the first embodiment, each parameter (thick layer of the divided spaces 8, 9, 10 and the hole diameter of the opening 5) is obtained. Next, as shown in FIG. 16, a sound absorbing structure is created with the obtained parameters. Specifically, a metal plate such as iron or aluminum having a predetermined thickness is prepared and set in a press machine. Then, the metal plate is pressed, the opening 5 is punched out, and simultaneously the connecting member 13 (the top portion 13a and the side surface portion 13b) is formed, whereby the interior plate 2a is created. In addition, a metal plate in which through holes 61a and 62a having small diameters are formed in advance is prepared, and support holes 61b and 62b are formed by pressing as in the case of the interior plate 2a. Each of the perforated plates 62 is created.

  As shown in FIG. 16, the connecting member 13 and the support holes 61b and 62b are formed to be long in one direction. Further, the connecting member 13 has a shape in which the diameter gradually decreases in a direction away from the metal plate. The support holes 61b and 62b have such a size that the connecting member 13 can be inserted and the side surface portion 13b of the connecting member 13 is engaged during the insertion. The through holes 61a and 62a may be formed by pressing simultaneously with the support holes 61b and 62b.

  Next, after the interior plate 2a is set on the table, the first porous plate 61 is covered from above the interior plate 2a, and the connecting member 13 is inserted into the support hole 61b. When the support hole 61b is supported in contact with the side surface portion 13b of the connecting member 13 during the insertion, the first perforated plate 61 is pressed from above with a predetermined pressure toward the interior plate 2a. 61 b is fixed by being pressed against the connecting member 13. In order to secure the fixing, the contact portion between the connecting member 13 and the support hole 61b may be fixed by an adhesive or welding, or may be fastened by screwing. The hollow portion 6 may be completely sealed by the closing plate 1 and the interior plate 2a. When the bonding portion between the closing plate 1 and the top portion 13a is only one point, the hollow portion 6 is completely sealed. It does not have to be. That is, the state in which the adjacent hollow portions 6 communicate with each other via a gap generated between the closing plate 1 and the top portion 13a may be used.

  Thereafter, the second perforated plate 62 is covered from above the first perforated plate 61. Similarly to the case of the first perforated plate 61, the support hole 62b of the second perforated plate 62 is supported and supported by the connecting member 13 in the middle of insertion. Fixed. Then, the blocking plate 1 is placed on the top portion 13a of the connecting member 13 protruding from the support hole 62b of the second porous plate 62, and is fixed by an adhesive or the like. As a result, the first and second perforated plates 61 and 62 have the support holes 61b and 62b having different diameters fixed at different portions of the side surface portion 13b of the connecting member 13, and the blocking plate is attached to the top portion 13a of the connecting member 13. By fixing 1, a sound-absorbing structure having layered divided spaces 8, 9, and 10 can be easily and highly accurately created.

  As described above, the method for manufacturing the sound absorbing structure according to the present embodiment includes the interior plate 2a (interior member) provided with the opening 5, and the closing plate 1 (exterior) disposed opposite to the interior plate 2a with a space therebetween. Member), the interior plate 2a, and the closing plate 1 are connected to form a hollow portion communicating with the external space through the opening 5, and the hollow portion 6 is divided into two or more second partition spaces. The interior plate 2a is a concavo-convex plate that is integrated with the connecting member 13 and has a concavo-convex portion constituted by the connecting member 13, and the closing plate 1 is provided with a partitioning porous plate 61, 62 (second partition member). A method of manufacturing a sound-absorbing structure which is a closed plate joined so as to close one of the concavo-convex portions, wherein support holes 61b and 62b are formed in the perforated plates 61 and 62, and the support holes 61b and 62b Insert through the convex part of the plate, and support and fix the support hole with the convex part during insertion. By is provided a porous plate 61, 62 in the hollow portion 6.

  Further, as a modification of the manufacturing method of the present embodiment, as in the manufacturing method of the second embodiment, as shown in FIG. 17, fitting convex portions 61 c and 62 c are formed on the first porous plate 61 and the second porous plate 62. You may make it do. Specifically, the interior plate 2a is created by pressing a metal plate such as iron or aluminum and punching the opening 5 and simultaneously forming the connecting member 13. The connecting member 13 is a flat plate formed from one end of the metal plate to the other end. In addition, a metal plate in which through holes 61a and 62a with small diameters are formed in advance is prepared, and fitting convex portions 61c and 62c are formed by pressing as in the case of the interior plate 2a. Second perforated plates 62 are respectively created. The fitting convex portion 61c can fit the connecting member 13, and the fitting convex portion 62c has a size capable of fitting the connecting member 13 and the fitting convex portion 61c. Note that the through holes 16a and 62a may be formed by press working simultaneously with the fitting convex portions 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 if the fitting convex part 61c is contact | abutted and supported by the top part 13a and the side part 13b of the connection member 13, the 2nd perforated panel 62 will be covered from the upper direction of the 1st perforated panel 61 continuously. Then, the first perforated plate 61 and the second perforated plate 62 are positioned and fixed by fitting the fitting convex portion 61 c of the first perforated plate 61 into the fitting convex portion 62 c of the second perforated plate 62. . The fixing may be performed with an adhesive. Thereafter, the closing plate 1 is placed on the fitting convex portion 62c of the second perforated plate 62 and fixed by an adhesive or the like. As a result, the first and second perforated plates 61 and 62 have the fitting protrusions 61c and 62c having different sizes (depths) fixed by the connecting member 13, and the blocking plate 1 is placed on the top of the fitting protrusion 62c. Is fixed, a sound-absorbing structure having segmented spaces 8, 9, and 10 having a layer thickness can be easily and highly accurately created. Further, when the connecting member 13 is fixed by the fitting convex portions 61c and 62c, the connecting member 13 can be formed in a flat plate shape, unlike the case where the connecting member 13 is fixed by the support holes 61b and 62b. A sound absorbing structure can be created.

  As described above, another method for manufacturing the sound absorbing structure according to the present embodiment includes an interior plate 2a (interior member) provided with the opening 5, and the closing plate 1 (the interior plate 2a) disposed opposite to the interior plate 2a. The exterior member), the interior plate 2a and the closing plate 1 are coupled to each other to form a hollow portion communicating with the external space through the opening 5, and the hollow portion 6 is divided into two or more second partition spaces. The interior plate 2a is a concavo-convex plate that is integrated with the connecting member 13 and has a concavo-convex portion formed by the connecting member 13, and includes a closing plate 1 and a perforated plate 61, 62 (second partition member). Is a method of manufacturing a sound absorbing structure which is a blocking plate joined so as to block one of the concavo-convex portions, wherein fitting protrusions 61c and 62c are formed on the perforated plates 61 and 62, and the fitting protrusions 61c and 62c are fitted to the convex part of the concavo-convex plate, and the convex part 61c and 6 are fitted by the convex part during the fitting. By supporting and fixing the c, providing a perforated plate 61, 62 in the hollow portion 6.

  The sound absorbing characteristics of the sound absorbing structure of Embodiment 1 were simulated. Specifically, as shown in FIG. 1, the layer thicknesses d1 and d2 of the divided spaces 8 and 9 are 8 mm and 8 mm, the aperture ratios β of the through holes 11a and 12a of the perforated plates 11 and 12 are 1%, respectively, When t is 0.3 mm, the hole diameter of the through holes 11a and 12a is 0.5 mm, the opening ratio β of the opening 5 is 7.3%, the plate thickness t is 0.7 mm, and the hole diameter is 2 mm. As shown in FIG. 9, in addition to the resonance frequency near 1800 Hz, it has a resonance frequency near 4050 Hz, compared with the case where no perforated plate is provided, in a wide range around a plurality of frequencies, It has a high sound absorption coefficient.

  The sound absorption characteristics of the sound absorbing structure approximate to the third embodiment were simulated. Specifically, when setting the parameters of Example 1 and using double aluminum foil as the thin films 42 and 43 of the thin film sound absorber 44, as shown in FIG. 10, the resonance frequency around 1950 Hz is 3200 Hz. It has a high suction rate in the vicinity of the resonance frequency range, and has a high sound absorption rate in a very wide range as compared with the case where no porous plate is provided.

It is a schematic block diagram of a sound absorption structure. It is a disassembled perspective view of a sound absorption structure. It is a schematic block diagram of a sound absorption structure. It is a schematic block diagram of a sound absorption structure. It is a schematic block diagram of a sound absorption structure. It is a disassembled perspective view of a sound absorption structure. It is a schematic block diagram of a sound absorption structure. It is a schematic block diagram of a sound absorption structure. It is a graph which shows a sound absorption characteristic. It is a graph which shows a sound absorption characteristic. It is a schematic block diagram of the sound absorption structure of a modification. It is a schematic block diagram of the sound absorption structure of a modification. It is a schematic block diagram of the sound absorption structure of a modification. It is a schematic block diagram of a sound absorption structure. It is a schematic block diagram of the sound absorption structure of a modification. It is a disassembled perspective view of a sound absorption structure. It is a disassembled perspective view of a sound absorption structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Blocking plate 2 Concavity and convexity plate 3 Convex part 4 Concave part 5 Opening part 6 Hollow part 11 1st perforated plate 12 2nd perforated plate 21 Perforated plate 31 1st perforated plate 41 Perforated plate 51 Sound absorbing material

Claims (18)

An uneven plate having an uneven portion and an opening, and
A blocking plate joined to the concavo-convex plate so as to form a hollow portion communicating with the external space through the opening by closing one of the concavo-convex portions;
A sound absorbing structure comprising: a first partition member that partitions the hollow portion into two or more first partition spaces. An interior member with an opening;
An exterior member disposed opposite to the interior member at an interval;
A connecting member that connects the interior member and the exterior member to form a hollow portion that communicates with an external space through the opening;
A sound absorbing structure, comprising: a second partition member that partitions the hollow portion into two or more second partition spaces. The interior member is
It is an uneven plate that is integrated with the connecting member and has an uneven portion constituted by the connecting member,
The exterior member is
The sound absorbing structure according to claim 2, wherein the sound absorbing structure is a closing plate joined so as to close one of the uneven portions.   4. The sound absorbing structure according to claim 1, further comprising: a closing member that closes the opening of the open portion where one of the concavo-convex plates is open adjacent to the hollow portion.   The said uneven | corrugated board is equipped with the 3rd partition member which partitions off the open part which one side which adjoins the said hollow part opens into two or more 3rd division space, The Claim 1, 3 or 4 characterized by the above-mentioned. The sound absorbing structure as described.   6. The sound absorbing structure according to claim 1, wherein at least one of the first, second, and third partition members includes a porous plate having a plurality of through holes.   6. The sound absorbing structure according to claim 1, wherein at least one of the first, second, and third partition members has a foil provided so as to vibrate or rub. 6. .   The sound absorbing structure according to claim 7, wherein the foil has a large number of through holes.   The sound absorbing structure according to claim 7, wherein the foil has an uneven portion.   The sound absorbing material according to any one of claims 1 to 9, wherein a sound absorbing material is provided in at least one of the first, second, and third partitioned spaces partitioned into two or more. Structure.   11. The sound absorbing structure according to claim 1, wherein only one of the first partitioned spaces partitioned into two or more communicates with the external space.   The sound absorbing structure according to any one of claims 2 to 10, wherein only one of the second partitioned spaces partitioned into two or more communicates with the external space.   The sound absorbing structure according to any one of claims 5 to 12, wherein only one of the third partitioned spaces partitioned into two or more communicates with the external space. An uneven plate provided with an uneven portion and an opening, and a blocking plate joined to the uneven plate so as to form a hollow portion communicating with the external space through the opening by closing one of the uneven portions And a manufacturing method of a sound absorbing structure comprising a first partition member that partitions the hollow portion into two or more first partition spaces,
By forming a support hole in the first partition member, inserting the support hole into a convex portion of the concavo-convex plate, and supporting and fixing the support hole by the convex portion during insertion, the first partition A method for producing a sound absorbing structure, wherein a member is provided in the hollow portion. An uneven plate provided with an uneven portion and an opening, and a blocking plate joined to the uneven plate so as to form a hollow portion communicating with the external space through the opening by closing one of the uneven portions And a manufacturing method of a sound absorbing structure comprising a first partition member that partitions the hollow portion into two or more first partition spaces,
A fitting projection is formed on the first partition member, the fitting projection is fitted to the projection of the concavo-convex plate, and the fitting projection is supported and fixed by the projection during fitting. By this, the manufacturing method of the sound-absorbing structure characterized by providing the said 1st partition member in the said hollow part. An interior member provided with an opening, an exterior member disposed opposite to the interior member with a space therebetween, and the interior member and the exterior member are connected to each other to communicate with an external space through the opening. And a second partition member that divides the hollow portion into two or more second partition spaces, and the interior member is integrated with the connection member, and is configured by the connection member. A method for producing a sound-absorbing structure, which is a closing plate joined so as to close one of the uneven portions,
By forming a support hole in the second partition member, inserting the support hole into the convex portion of the concavo-convex plate, and supporting and fixing the support hole by the convex portion during insertion, the second partition A method for producing a sound absorbing structure, wherein a member is provided in the hollow portion. An interior member provided with an opening, an exterior member disposed opposite to the interior member with a space therebetween, and the interior member and the exterior member are connected to each other to communicate with an external space through the opening. And a second partition member that divides the hollow portion into two or more second partition spaces, and the interior member is integrated with the connection member, and is configured by the connection member. A method for producing a sound-absorbing structure, which is a closing plate joined so as to close one of the uneven portions,
A fitting projection is formed on the second partition member, the fitting projection is fitted to the projection of the concavo-convex plate, and the fitting projection is supported and fixed by the projection during fitting. Thus, the method of manufacturing a sound absorbing structure, wherein the second partition member is provided in the hollow portion.   The method for manufacturing a sound absorbing structure according to any one of claims 14 to 17, wherein a plurality of through holes are provided in at least one of the first partition member and the second partition member.

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