Classifications

• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects

Definitions

• the present invention is suitable as a structural member, panel, or soundproofing bar for automobiles, railway vehicles, buildings, general-purpose machines, and the like, and has a sound absorbing structure and a soundproofing structure that exhibit soundproofing performance against sound pressure excitation. And its manufacturing method.
• a perforated plate is installed on the lower surface side of a panel via an air layer, and the thickness of the perforated plate, the diameter of the holes, the pitch, and the thickness of the air layer are adjusted.
• a vehicle sound absorbing member 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 holes, the pitch, and the thickness of the air layer by utilizing the Helmholtz resonance principle. is there.
• the conventional configuration described above has a problem that the sound absorption coefficient increases only near the Helmholtz resonance frequency, and it is difficult to broaden the sound absorption performance.
• the first present invention provides an uneven plate provided with an uneven portion and an opening, and an uneven portion formed so as to form a hollow portion communicating with an external space through the opening by closing one of the uneven portions.
• This configuration includes a closing plate joined to the plate, and a first partition member that partitions the hollow portion into two or more first partitioned spaces. According to this configuration, it is possible to obtain excellent sound absorption performance in which a frequency band having a high sound absorption coefficient is expanded.
• a second invention is the concavo-convex plate of the first invention, further comprising a closing member that closes an opening of an open portion that is open on one side adjacent to the hollow portion.
• the third invention provides the uneven plate according to the first invention, wherein the open portion adjacent to the hollow portion is open on one side. This is a configuration including a third partition member that partitions the minute into two or more third partitioned spaces. According to this configuration, a higher sound absorption coefficient can be obtained.
• the first partition member of the first aspect has a perforated plate having a large number of through holes.
• a fifth invention is configured such that the third partition member of the third invention has a perforated plate having a large number of through holes. According to these configurations, it is possible to obtain excellent sound absorption performance in which a frequency band having a high sound absorption coefficient is expanded.
• a sixth invention is a configuration in which the first partition member of the first invention has a foil provided so as to be able to vibrate or rub
• a seventh invention is a configuration in which the first partition member of the third invention is a third invention.
• the third partition member has a foil provided so as to be able to vibrate or rub.
• the foil of the sixth invention may have many through-holes (eighth invention), and the foil of the seventh invention may have many through-holes ( Ninth invention). Further, the sixth foil may have an uneven portion (the tenth invention), and the seventh foil may have a concave and convex portion, or may have the unevenness (the eleventh invention). ).
• a twelfth invention is the configuration according to the first invention, wherein a sound absorbing material is provided in at least one of the first partitioned spaces partitioned into two or more.
• a thirteenth invention is the third invention, wherein a sound absorbing material is provided in at least one of the two or more third partitioned spaces. According to these configurations, it is possible to obtain excellent sound absorbing performance in which a frequency band having a high sound absorbing coefficient is further expanded.
• a fifteenth invention is the configuration according to the third invention, wherein only one of the third partitioned spaces partitioned into two or more communicates with the external space. This simplifies the configuration.
• the interior member according to the sixteenth aspect is an uneven plate having an uneven portion formed by integrating the connecting member with the connecting member. Close one It is a closing plate joined so as to close. According to this configuration, the sound absorbing structure can be easily manufactured by integrating the interior member and the connecting member.
• An eighteenth aspect of the invention is the concavo-convex plate of the seventeenth aspect, further comprising a closing member that closes an opening of the open portion that is open on one side adjacent to the hollow portion.
• a nineteenth aspect of the present invention is the uneven plate of the seventeenth aspect, further comprising a third partition member for partitioning the open portion adjacent to the hollow portion and having one open side into two or more third partitioned spaces. is there. According to this configuration, a higher sound absorption coefficient can be obtained.
• the second partition member of the sixteenth aspect has a multi-hole plate having a large number of through holes.
• a twenty-first invention is configured such that the third partition member of the nineteenth invention has a perforated plate having a large number of through holes. According to these configurations, it is possible to obtain excellent sound absorption performance in which a frequency band having a high sound absorption coefficient is expanded.
• the twenty-second invention may be configured such that the second partition member of the sixteenth invention has a foil provided so as to be able to vibrate or rub.
• the twenty-third invention may have a configuration in which the third partition member of the nineteenth invention has a foil provided so as to be able to vibrate or rub.
• the foil of the twenty-second invention may have a large number of through-holes (the twenty-fourth invention), and the foil of the twenty-third invention may have a large number of through-holes ( Twenty-fifth invention).
• foils of the invention of the 22 may have a concave-convex portion (26 invention)
• foil invention of a 23 may have a concave-convex portion (27 invention) 0
• a twenty-eighth invention is the configuration according to the sixteenth invention, wherein a sound absorbing material is provided in at least one of the second divided spaces divided into two or more.
• a twenty-ninth aspect is the configuration according to the nineteenth aspect, wherein a sound-absorbing material is provided in at least one of the second and third partitioned spaces. According to this configuration, it is possible to obtain excellent sound absorbing performance in which a frequency band having a high sound absorbing coefficient is further expanded.
• a thirty-first aspect is the configuration according to the nineteenth aspect, wherein only one of the third divided spaces partitioned into two or more communicates with the external space. According to these configurations, the configuration is simplified.
• an uneven plate having an uneven portion and an opening, and a hollow portion communicating with an external space through the opening are formed by closing one of the uneven portions.
• a method of manufacturing a sound absorbing structure comprising: a closing plate joined to the uneven plate; and a first partition member that partitions the hollow portion into two or more first partitioned spaces.
• a support hole is formed in the member, the support hole is passed through the convex portion of the concave and convex plate, and the support hole is supported and fixed by the convex portion in the middle of the passage, so that the first partition member is formed.
• This configuration is provided in the hollow part.
• the present invention provides an uneven plate having an uneven portion and an opening, and the uneven portion formed by closing one of the uneven portions with a hollow portion communicating with the external space through the opening.
• a method for manufacturing a sound-absorbing structure comprising: a closing plate joined to a plate; and a first partition member that partitions the hollow portion into two or more first partitioned spaces, the method including: fitting to the first partition member.
• the present invention provides an interior member having an opening, an exterior member disposed to face the interior member at a distance from the interior member, and connecting the interior member and the exterior member to each other.
• a connecting member that forms a hollow portion communicating with the external space through the second space member, 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.
• a method of manufacturing a sound-absorbing structure which is an uneven plate having an uneven portion formed by the connecting member, wherein the exterior member is a closing plate joined so as to close one of the uneven portions.
• the present invention provides an interior member having an opening, an exterior member facing the interior member at a distance from the interior member, and connecting the interior member and the exterior member through the opening.
• a connecting member that forms a hollow portion communicating with the 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,
• a method for manufacturing a sound-absorbing structure which is an uneven plate having an uneven portion formed by the connecting member, wherein the exterior member 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 uneven plate, and the fitting projection is supported and fixed by the projection during fitting.
• the second partition member is provided in the hollow portion.
• a plurality of through holes are provided in at least one of the first and second partition members. This makes it possible to easily and accurately create a sound absorbing structure having a sectional space.
• the present invention has an advantage that excellent sound absorption performance in which a frequency band having a high sound absorption coefficient is expanded can be obtained because a perforated plate that partitions a hollow portion into two or more partitioned spaces is provided.
• Embodiment 1 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 having a drive mechanism such as an engine inside, such as an automobile, a railroad vehicle, a construction vehicle, a ship, and an automatic transfer device, and a drive mechanism such as a motor and a gear. It is suitable for use as a soundproof cover or structural member of equipment provided in a building, or as a floor, wall or ceiling of a panel or building.
• the sound absorbing structure includes, for example, a flat plate-shaped closing plate 1 facing the outside where noise is a problem, and a sound source side including a driving mechanism such as an engine for generating noise. And an uneven plate 2 facing the same.
• the closing plate 1 and the concavo-convex plate 2 are formed of a metal such as iron or aluminum or a resin material. Note that the closing plate 1 and the uneven plate 2 are desirably formed of the same material so that the separation process at the time of recycling is not required.
• the uneven plate 2 has a flat recess 4 and a plurality of protrusions 3 projecting from the recess 4 in the direction of the closing plate 1 and joined to the closing plate 1.
• a large number of openings 5 are formed in the recess 4.
• the convex portions 3 are dispersedly arranged at a predetermined distance.
• the projection 3 may be provided so as to surround one end of the force and the other end.
• the opening 5 may be further formed in the convex portion 3.
• the above-mentioned convex portion 3 is formed in a conical shape having a flat top portion 3a and a side portion 3b inclined while enlarging the peripheral force diameter of the top portion 3a.
• the top 3a of the projection 3 has a recess 4
• the above-mentioned closing plate 1 is joined so as to close off.
• a hollow portion 6 is formed between the closing plate 1 and the concavo-convex plate 2 and surrounded by the concave portion 4, the closing plate 1, and the convex portion 3 and communicated with the external space via the opening 5. I have.
• a first perforated plate 11 and a second perforated plate 12 are provided in the hollow portion 6, a first perforated plate 11 and a second perforated plate 12 (first partition member) are provided.
• the first and second first perforated plates 11 and 12 are arranged in parallel with the concave portion 4, and partition the hollow portion 6 into three-layered divided spaces 8.9 and 10 in this order from the sound source side.
• Each of the perforated plates 11 and 12 has a large number of through holes lla '12a and a support hole lib' 12b.
• the support holes lib'12b are arranged so as to have a positional relationship corresponding to the arrangement position of the convex portions 3, and are set to have a hole diameter supported by the side surface portions 3b of the convex portions 3.
• the hole diameter of the support hole lib '12b differs between the first perforated plate 11 near the sound source side and the second multi-hole plate 12 far from the sound source side, that is, the support hole of the first perforated plate 11.
• the hole diameter of the lib is larger than the hole diameter of the support hole 12b of the second perforated plate 12.
• the first and second perforated plates 11 and 12 are respectively supported and supported by support holes lib '12b having different diameters at different portions of the side surface portion 3b of the convex portion 3 during insertion into the convex portion 3.
• the multi-degree-of-freedom vibration system is formed by using the air in each of the above-mentioned divided spaces 8, 9, and 10 as a spring, and the air in the through holes lla ′ 12 a of the perforated plates 11 and 12 as the mass.
• the air in the through holes 1 la '12a of the perforated plates 11 and 12 vibrates violently, and has a large sound absorbing power due to friction loss.
• the parameters consisting of the aperture ratio, the plate thickness t, and the hole diameter b of at least one member of the opening of the concavo-convex plate 2 and the through holes lla '12a of the first and second perforated plates 11 and 12 are independently sound absorbing. It is preferable that the combination exhibit a rate of 0.3 or more.
• parameters consisting of the layer thickness d, the aperture ratio j3, the plate thickness t, and the hole diameter b are determined by the opening 5 of the concavo-convex plate 2 and the through-holes lla '12a It is preferable that the setting is made so as to cause a viscous effect on air passing through at least one of the above.
• the viscous action of the air causes vibration and damping, and the frequency bandwidth at which the sound absorption coefficient becomes 0.3 or more is higher than the resonance frequency f. This makes it possible to exhibit sound absorption characteristics of 10% or more.
• the parameters of the sound absorbing structure are equal to or less than the aperture ratio of at least one of the concavo-convex plate 2 and the perforated plates 11 and 12 so as to have the above-described sound absorbing characteristics.
• the hole diameter b of the opening 5 and the through hole lla '12a is set to the design condition of 0.8 mm or less.
• the hole diameter of the opening 5 and the through-hole lla '12a is not particularly limited, but any member is 5 mm or less, preferably 3 mm or less, more preferably 1 mm or less. Desirably.
• the sound absorbing structure may be configured by focusing only on the hole diameters of the opening 5 and the through-hole lla '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 lla ′ 12a having a diameter of 1 mm or less.
• the hole diameter of the through-hole lla '12a is set to 1 mm or less, the viscous action can be reliably generated in the air flowing through the through-hole lla' 12a.
• the lower limit of the diameter of the opening 5 and the through-hole lla ′ 12a is preferably 0.2 mm.
• the reason is that, when the diameter of the through-hole lla '12a approaches 0, the peak of the sound absorption coefficient theoretically becomes 1.0, but in reality, the diameter does not reach 1.0 and the diameter becomes 0.2 mm. If the diameter is extremely small as follows, the viscosity of the air in the through-hole lla '12a becomes too large, so that the resistance to the flow of the air in the through-hole lla' 12a is increased, and the sound absorption coefficient is considered to be rather lowered. Further, when the diameter is extremely small, such as 0.2 mm or less, the production becomes extremely difficult, and depending on the use environment, the through-hole lla ′ 12a is easily blocked by dust and the like.
• the opening 5 and the through-hole lla * 12a may be elliptical, rectangular, polygonal, or slit-shaped, or may have various shapes between the opening 5 and the through-hole lla ′ 12a. Even if it is mixed inside, it is good. Further, the opening 5 and the through-hole lla '12a are set to the same size and diameter, and the various sizes and diameters can be set to the opening 5 and the through-hole 1 la' 1 2a. Even if it is mixed between and inside, it is good. When various sizes and diameters are mixed, the frequency bandwidth in which sufficient sound absorbing performance is exhibited can be expanded.
• the sound absorbing structure according to the present embodiment has a configuration in which the divided spaces 8, 9, and 10 of each layer are arranged in parallel.
• the present invention is not limited to this. That is, the division of the sound absorbing structure
• the spaces 8, 9, and 10 may be divided or divided into arbitrary shapes and volumes in the hollow portion 6 by a partition member that partitions the hollow portion 6.
• 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 they may be provided at uneven intervals so that the layer thicknesses are uneven. You may do it. In this case, the sound absorbing performance can be easily adjusted by changing the partition member.
• perforated plates 11 and 12 are provided with a force provided in hollow portion 6, as shown in FIG. 11, a top portion 3 a and a side portion 3 b of convex portion 3 adjacent to hollow portion 6.
• a perforated plate 14 (third partition member) and a perforated plate 15 (closing member) may be provided in the opening 7 surrounded by the above.
• the perforated plate 14 and / or the perforated plate 15 may have a structure that bulges in a direction opposite to the convex portion 3 in order to take a large air space.
• the perforated plate 14 and / or perforated plate 15 may have a structure in which the air layer may be thin when absorbing high frequencies, since the air layer may be thin.
• the perforated plate 15 may be provided without providing the perforated plate 14.
• the perforated plates 14 and 15 may be a metal foil or a thin film. In this case, the metal foil and the thin film may or may not have a through hole.
• the frequency characteristics of the noise to be absorbed are actually measured or estimated.
• the layer thickness dl'd2'd3 is set to lmm-50mm, the uneven plate 2 and the first and second porous layers so that the sound absorption coefficient of the frequency bandwidth including a plurality of peak components is 0.3 or more.
• the air viscosity is determined based on the design conditions where the opening ratio 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 hole lla '12a is 0.8 mm or less. The parameters are determined in consideration of the above.
• a sound absorbing structure is created with the above parameters. Specifically, a metal plate having a predetermined thickness such as iron or aluminum is prepared and set in a press machine. Then, the metal plate is pressed, and the projections 3 are formed at the same time that the openings 5 are punched out. Further, a metal plate on which a small-diameter through hole l la '12a is formed in advance is prepared, and the support holes l ib' 12 b are formed by pressing in the same manner as the uneven plate 2, whereby the first porous plate 11 And the second perforated plate 12 are respectively created. The through hole l la '12a is formed by pressing at the same time as the support hole l ib' 12b. It is good to be done.
• a metal plate having a predetermined thickness such as iron or aluminum is prepared and set in a press machine. Then, the metal plate is pressed, and the projections 3 are formed at the same time that the openings 5 are punched out. Further, a metal plate on which
• the first perforated plate 11 is covered from above the concavo-convex plate 2, and the convex portions 3 are inserted into the support holes lib.
• the support holes l ib abut on the side surface portions 3b of the projections 3 and are supported during the insertion, the upward force is also exerted by the first perforated plate 11 being pressed by the predetermined pressure in the direction of the uneven plate 2 so that the support is performed.
• the hole l ib is fixed by being pressed against the projection 3.
• the contact portion between the projection 3 and the support hole lib 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 uneven plate 2, or may be completely sealed when the bonding portion between the closing plate 1 and the top 3a is only one point. You don't have to. That is, the hollow portions 6 that are in P-contact may communicate with each other via a gap generated between the closing plate 1 and the top 3a.
• the second perforated plate 12 is covered from above the first perforated plate 11, and similarly to the case of the first perforated plate 11, the support hole 12 of the second perforated plate 12 is formed by the convex portion 3 in the middle of insertion. Are supported and 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 fixed with an adhesive or the like.
• the first and second perforated plates 11 and 12 have support holes l ib ′ 12b having different diameters fixed at different portions of the side surface portion 3b of the convex portion 3 and closed at the top 3a of the convex portion 3.
• the perforated plates 14 and 15 are provided in the opening 7, for example, the perforated plates 14 and 15 having different diameters are formed, and the openings 3 are formed from the top 3a side of the convex portion 3 in order from the smaller diameter.
• the sound-absorbing structure is created by installing it in the opposite direction.
• the noise proceeds to reach the sound absorbing structure disposed opposite to the sound source.
• the sound absorbing structure is formed with the aperture ratio, the thickness of the interior plate, the hole diameter, and the thickness of the air layer configured to satisfy the required performance, and the sound absorbing characteristics are in the vicinity of a plurality of resonance frequencies. It has a three-story sectioned space with high sound absorption coefficient. Therefore, when the noise reaches the sound absorbing structure, noise components in a plurality of peripheral bands of the resonance frequency are absorbed at a high sound absorption rate, thereby generating a sound source such as an engine. Main and wide frequency band noise can be absorbed. Thereby, the sound absorbing structure can absorb noise in a main wide frequency band.
• the sound-absorbing structure of the present embodiment communicates with the external space via the concave / convex plate 2 having the convex portion 3 and the concave portion 4 (the concave / convex portion) and the opening 5, and the opening 5.
• the closing plate 1, the concave portion 4, and the like are formed in a flat plate shape.
• the present invention is not limited to this. May be provided.
• two porous plates 11 and 12 are provided in a hollow portion 6 formed by a concave portion 4 and a closing plate 1.
• the present invention is not limited to this. That is, as shown in FIG. 3, there is an uneven plate 2 having a convex portion 3 formed so as to surround the periphery of one concave portion 4, and three hollow portions 6 formed by the concave portion 4 and the closing plate 1 are provided.
• a configuration in which the above-described perforated plate 21 is provided may be employed.
• the number of the perforated plates 21 may be one.
• the through-holes 2 la of each perforated plate 21 have various shapes and diameters, such as an elliptical shape, a rectangular shape, a polygonal shape, and a slit shape, existing uniformly between and inside each perforated plate 21. Also mixed, even good.
• the sound absorbing structure may have a configuration in which the configurations of FIG. 3 are arranged in a line or in a matrix of vertical and horizontal directions. In the case of this configuration, it is possible to improve the sound absorbing power.
• the opening 5 of the uneven plate 2 and the through-hole 21a of each perforated plate 21 may have the same shape and diameter between and inside the hollow portions 6 arranged in parallel, or may be mixed. Even if it is good. As a result, it is possible to obtain a sound absorption performance with a wider peak frequency.
• numerical values such as the aperture ratio / 3, the thick layer d, and the plate thickness t are specifically described. The force is not limited to this. These values correspond to the sound absorbing structure according to the present embodiment. Is determined by the environment in which the device is installed, the required strength, form, and the like.
• the sound absorbing structure according to the present embodiment has a closing plate 1 and an uneven plate 2.
• the uneven plate 2 has a flat 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.
• a first perforated plate 31 and a second perforated plate 32 are provided in the hollow portion 6, .
• the first perforated plate 31 has a large number of through holes 31a and 32a and also has fitting projections 31b and 32b.
• the fitting projections 31 b ′ 32 b are arranged so as to have a positional relationship corresponding to the arrangement position of the projections 3, and are supported by the side surfaces 3 b and the tops 3 a of the projections 3.
• the shape is set to a conical shape with different depths. That is, the fitting projections 31b ′ and 32b have different depths between the first multi-hole plate 31 near the sound source side and the second multi-hole plate 32 far from the sound source side, that is, the fitting projection of the first perforated plate 31.
• the depth of the portion 31b is larger than the depth of the fitting projection 32b of the second porous plate 32.
• the first and second perforated plates 31 and 32 have fitting projections 31b 'and 32b having different depths fitted into the projections 3, and the side surfaces 3b and the tops of the projections 3 during the fitting.
• the layer thicknesses dl, d2, and d3 of the sectional spaces 8, 9, and 10 are set by being abutted and supported by 3a, respectively.
• the perforated plates 31 and 32 may be provided at equal intervals so that the layer thicknesses dl'd2'd3 are equal, or may be provided at unequal intervals so as to be unequal.
• the other configuration is the same as that of the first embodiment, and may be a configuration in which the configuration of the above-described first embodiment, a configuration of a modification thereof, and the like are appropriately applied.
• a sound absorbing structure is created with the parameters determined in advance by the method of the first embodiment. Specifically, a metal plate made of iron, aluminum, or the like is pressed, the opening 5 is punched, and the projection 3 is formed at the same time, whereby the uneven plate 2 is formed.
• a metal plate in which small-diameter through holes 31a '32a are formed in advance is prepared, and the fitting projections 31b' 32b are formed by press working similarly to the uneven plate 2, whereby the first The perforated plate 31 and the second perforated plate 32 are respectively formed.
• the through holes 31a '32a may be formed by press working simultaneously with the fitting projections 31b' 32b.
• the first perforated plate 31 is covered from above the uneven plate 2, and the projection 3 is fitted to the fitting projection 31b.
• the second perforated plate 32 is subsequently covered from above the first perforated plate 31.
• the fitting projection 31b of the first porous plate 31 is fitted to the fitting projection 32b of the second porous plate 32, so that the first and second porous plates 31 and 32 are positioned and positioned.
• Fixed It should be noted that the fixing can be performed with an adhesive.
• the closing plate 1 is placed on the fitting projection 32b of the second porous plate 32, and is fixed by an adhesive or the like.
• the first and second perforated plates 31 and 32 are formed such that the fitting protrusions 31b '32b having different sizes (depths) are fixed by the protrusions 3 and the closing plate is provided on the top of the fitting protrusions 32b.
• fixing 1 a sound absorbing structure having sectioned spaces 8, 9, 10 with a layer thickness of dl'd2'd3 is easily and accurately created.
• Other manufacturing methods are the same as in the first embodiment.
• the noise components in the peripheral bands of the plurality of resonance frequencies are absorbed at a high sound absorption rate, so that the engine The main and wide frequency band noise generated by the sound source can be isolated.
• the sound absorbing structure according to the present embodiment has an uneven plate 2 having a large number of openings 5 in a convex portion 3 and a concave portion 4, and an opening joined to the uneven plate 2.
• a plurality of perforated plates 41 are provided in the hollow portion 6 formed by 5 and 5.
• the perforated plate 41 has a large number of through-holes 41a and a support hole 4 lb set to a hole diameter corresponding to each layer, as in the first embodiment. Further, the plurality of perforated plates 41 may be provided at equal intervals or at irregular intervals.
• 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 uneven plate 2, or between the perforated plate 41 and the closing plate 1. Optimal sound source for sound absorption It is desirable to be in an arrangement state.
• the thin-film sound absorber 44 includes two thin films 42 and 43.
• the surfaces of these thin films 42 and 43 are formed flat, and these surfaces are slightly separated from each other, and are adjacent to each other in a state where they can be contacted during vibration.
• a metal thin film such as an aluminum foil or a resin thin film such as a chloride bur can be used.
• the present invention is not limited to these.
• the other configuration is the same as that of the first embodiment, and may be a configuration in which the configuration of the above-described first embodiment, a configuration of a modified example thereof, and the like are appropriately applied.
• the sound absorbing structure of the present embodiment at least one of the thin film sound absorbing members 44 (foil) is provided so as to vibrate or rub against at least one of the divided spaces dividing the hollow portion 6.
• the sound absorbing structure vibrates the two thin films 42 and 43 due to the incident sound waves, and accordingly, the two thin films 42 and 43 The sonic energy can be consumed by the contact and rubbing of 43. This makes it possible to exhibit excellent sound absorption performance over a wide band as compared with a configuration in which energy is dissipated by using a resonance phenomenon.
• the sound absorbing structure can be made of metal such as aluminum foil or a thin film sound absorbing body 44 made of resin such as vinyl chloride, it is difficult to dispose of glass wool or the like which had to be disposed of as conventional shredder dust. Recycling is easier than recycled materials.
• the thin films 42 and 43 may be stacked such that the thin film has a large number of minute projections, and the projections make contact with other thin films. In this case, when a sound wave is incident, the thin films 42 and 43 vibrate, and the overlapped portions come into contact with each other and cause friction, so that energy dissipation of the sound wave occurs and sound absorption can be realized.
• the thin films 42 and 43 of the thin film sound absorber 44 have fine through holes formed in the thickness direction, and these through holes overlap when viewed in the laminating direction of the two thin films 42 and 43. Or it may be formed at a position where it does not overlap. When they overlap, the thin films 42 and 43 vibrate and rub against each other to provide an excellent noise reduction effect over a wide band. In addition, when the sound waves pass through the through-hole, the sound waves are further attenuated. The effect can be demonstrated.
• the through-holes of one of the thin films 42 and 43 overlap with the through-holes of the other thin films 43 and 42 facing each other. If it is formed at a position where it does not, the sound wave passes through the through-hole of one thin film 43 from the incident side, passes between the two thin films 42, 43, and passes through the through-hole of the other thin film 42. You will get out. Therefore, the sound wave propagates along the inner surfaces of the two thin films 42 and 43, so that the damping effect when passing through the through hole and the viscous attenuation when the sound wave propagates on the surface of the thin films 42 and 43 In combination with the action, a further silencing effect is exhibited. Further, the thin-film sound absorber 44 has a more excellent damping effect and a remarkable improvement in the sound-muffling effect because the through-holes are formed as fine holes. Note that the thin-film sound absorber 44 may not have a through-hole.
• the thin-film sound absorbing member 44 may be folded so as to have a portion that overlaps while being in contact with each other. In this case, the overlapping portions come into contact with each other and rub against each other, so that the sonic energy can be consumed and a high sound absorption coefficient can be realized in a wide band. Further, even if the two thin films 42 and 43 are reduced to one, the sound absorbing structure can be achieved in the overlapping portion, and the cost can be reduced.
• the sound absorbing structure is provided with the perforated plate 41 and the thin film sound absorbing body 44.
• the thin film sound absorbing body 44 itself has a sound absorbing effect
• the thin film sound absorbing body 44 has a sound absorbing effect. Even if it is a sound-absorbing structure provided with only a sound, it is good.
• a thin-film sound absorbing body 45 may be provided in the opening 7 surrounded by the top 3a and the side surface 3b of the projection 3. .
• the thin film sound absorber 45 may be the same perforated plate as the perforated plate 41, and both the thin film sound absorber 45 and the perforated plate may be provided.
• the sound absorbing structure according to the present embodiment has an uneven plate 2 having a large number of openings 5 in a convex portion 3 and a concave portion 4, and an opening joined to the uneven plate 2.
• a plurality of perforated plates 41 are provided in the hollow portion 6 formed by 5 and 5. Further, similarly to the third embodiment, a plurality of multi-hole plates 41 may be provided at equal intervals or at irregular intervals.
• a sound absorbing material 51 is provided in the hollow portion 6. The sound absorbing material 51 is provided at an arbitrary part (partition space) of the hollow part 6. For example, between the perforated plate 41 and the closing plate 1, between the perforated plates 41 It is provided on all or a part of the uneven plate 2. Further, the position where the sound absorbing material 51 is provided may be the same or different in each hollow portion 6.
• the sound absorbing material 51 is made of a porous material.
• the porous body may be formed by compressing a metal fiber such as aluminum, stainless steel, glass wool, pet fiber, or a strip of metal, or may be formed of a nonwoven fabric. Further, a foam of metal or resin material may be used.
• the porous body is desirably formed of the same metal so that good recyclability can be obtained if the closing plate 1 and the uneven plate 2 are made of metal.
• Other configurations are the same as those of the first and third embodiments, and may be configurations to which the configurations of the above-described first and third embodiments and the modifications thereof are appropriately applied.
• the sound absorbing structure 51 can absorb noise in a frequency band wider than a frequency band in which the sound absorbing material 51 can sufficiently absorb the sound by the Helmholtz resonance principle, so that the sound absorbing performance is further improved. It is possible.
• the sound absorbing material 51 is provided in the hollow portion 6, but the sound absorbing material 51 is not limited to this, and may be provided together with the thin film sound absorbing body 44 of the third embodiment.
• the sound absorbing structure may have a structure in which the sound absorbing material 51 is provided around the uneven plate 2.
• a sound absorbing material 52 may be provided in the opening 7 surrounded by the top 3a and the side surface 3b of the projection 3.
• the sound absorbing structure has a flat interior plate 2a (interior member) having a large number of openings 5, and a space between the interior plate 2a and the interior plate 2a. It has a closing plate 1 (exterior member) that is disposed to face the unit, and a connecting member 13 that connects the inner plate 2a and the closing plate 1 to form a hollow portion 6.
• the closing plate 1 and the interior plate 2a are plate members, such as a metal such as iron or aluminum, a resin material, or a foil.
• the connecting member 13 is formed in a columnar shape having a flat top portion 13a and a side surface portion 13b provided on the periphery of the top portion 13a.
• the configuration is the same as that of the convex portion 3 of the first embodiment.
• the connecting member 13 may have a shape without the top 13a, that is, a cylindrical shape having only the side surface 13b.
• the hollow portion 6 communicates with the external space via the opening 5, and the hollow portion 6 includes a first perforated plate 61 and a second perforated plate 62 (second partition member). Is provided.
• the first and second first perforated plates 61 and 62 are provided with a large number of through holes 61a'62a, are arranged in parallel with the interior plate 2a, and have a hollow section 6 divided into three layers of divided spaces 8 and 62.
• the sound source is divided into 9 and 10 in this order.
• the perforated plates 61 and 62 may be provided at equal intervals so as to make the thick layers of the divided spaces 8 9 and 10 uniform, or may be provided at irregular intervals so as to make the thick layers uneven. Is also good. Note that the operation of the sound absorbing structure is the same as that of the first embodiment, and a description thereof will be omitted.
• the sound absorbing structure includes the interior plate 2a (the interior member) having the opening 5 and the closing plate 1 (the exterior member) which is arranged to face the interior plate 2a at an interval. And a connecting member 13 that connects the interior plate 2a and the closing plate 1 to form a hollow portion 6 that communicates with the external space through the opening 5, and divides the hollow portion 6 into two or more partitioned spaces.
• the first and second perforated plates 61 and 62 are provided. According to this configuration, as in the first embodiment, it is possible to obtain an effect that an excellent sound absorbing performance in which a frequency band having a high sound absorption coefficient is expanded can be obtained.
• the connecting member 13 and the interior board 2a are separately configured, they can be formed of different members.
• the connecting member 13 of the present embodiment has a cylindrical shape
• the connecting member 13 may have any other shape, and may form the hollow portion 6 by connecting the closing plate 1 and the interior plate 2a. If something is good, 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 formed in a plate shape.
• the first perforated 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 coefficient can be obtained. Further, two or more perforated plates may be provided.
• the perforated plate 21 forms a large number of divided spaces 8, 9, 10, so that a greater number of peak frequencies can be realized, and the sound absorption performance can be broadened.
• the multi-hole plates 61 and 62 are provided in the hollow portion 6, a perforated plate is provided in an opening portion adjacent to the hollow portion 6 and surrounded by the top portion 13a and the side portion 13b of the connecting member 13. Good Les ,.
• the closing plate 1 and the interior plate 2a are formed in a flat plate shape, the closing plate 1 and the interior plate 2a may have a local unevenness or a curved surface, or may have a step.
• the interior plate 2a and the connecting member 13 may be integrated into one member.
• the interior plate 2a is an uneven plate integrated with the connecting member 13 and having an uneven portion formed by the connecting member 13, and the closing plate 1 is joined so as to close one of the uneven portions. It may be.
• the sound absorbing structure can be easily manufactured.
• an opening having the same width as the opening of the connecting member 13 may be provided in the interior plate 2a so that the opening surrounded by the top 13a and the side surface 13b of the connecting member 13 is opened.
• the connecting member 13 may be configured by bending the closing plate 1, the interior plate 2a, the perforated plates 61 and 62, and the like.
• a plurality of through holes may be provided in the connecting member 13. In this case, resonance occurring in a direction parallel to the closing plate 1 and the interior plate 2a can be prevented. Further, the damping effect when passing through the through hole can be improved.
• the sound absorbing members 51 and 52 may be arranged in any of the divided spaces 8, 9, and 10 of the hollow portion 6.
• the first perforated plates 61 and 62 may be a 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.
• a configuration in which the configuration of the above-described Embodiment 14 or the configuration of the modification thereof is appropriately applied may be used.
• a method of manufacturing the sound absorbing structure in the above configuration will be described.
• the manufacturing method described below is a method for manufacturing a sound-absorbing structure in which the interior board 2a and the connecting member 13 are integrated, and the connecting member 13 forms an uneven portion.
• each parameter is obtained.
• a sound absorbing structure is created with the determined parameters. Specifically, a metal plate of a predetermined thickness such as iron or aluminum is prepared and set in a press machine. Then, the metal plate is pressed and the opening 5 is punched out, and at the same time, the connecting member 13 (the top portion 13a and the side surface portion 13b) is formed, whereby the interior plate 2a is created.
• a metal plate in which small-diameter through-holes 61a and 62a are formed in advance is prepared, and support holes 61b and 62b are formed by pressing in the same manner as the interior plate 2a.
• the first perforated plate 61 and the second perforated plate 62 are respectively formed.
• connection member 13 and the support holes 61b 'and 62b are formed to be longer in one direction, as shown in Fig. 16.
• the connecting member 13 has a shape whose diameter gradually decreases in a direction in which the connecting member 13 moves away from the metal plate.
• the support holes 61b and 62b have a size that allows the connection member 13 to be inserted, and the side surface portion 13b of the connection member 13 is engaged during insertion.
• the through holes 61a'62a may be formed by pressing at the same time as the support holes 61b'62b.
• the first perforated plate 61 is covered from above the interior plate 2a, and the connecting member 13 is passed through the support hole 61b.
• the support hole 6 lb abuts on and is supported by the side surface 13b of the connecting member 13 during the passage, the first perforated plate 61 is pressed from above by a predetermined pressure in the direction of the interior plate 2a.
• the support hole 61b is fixed by being pressed against the connecting member 13.
• the contact portion between the connecting member 13 and the support hole 61b may be fixed by welding with an adhesive, or may be fastened by screwing.
• the hollow portion 6 may be completely sealed by the closing plate 1 and the interior plate 2a, or may be completely closed when the bonding portion between the closing plate 1 and the top 13a is only one point. It does not have to be sealed. That is, the adjacent hollow portions 6 may be in communication with each other via a gap generated between the closing plate 1 and the top 13a.
• the second perforated plate 62 is covered from above the first perforated plate 61, and the connecting member 13 in the middle of insertion inserts the support hole 62b of the second perforated plate 62 in the same manner as the first perforated plate 61. Are supported and fixed. Then, the closing plate 1 is placed on the top 13a of the connecting member 13 protruding from the support hole 62b of the second porous plate 62, and is fixed with 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 connection member 13, and are closed at the top portion 13a of the connection member 13. By fixing the plate 1, a sound-absorbing structure having section spaces 8, 9, and 10 having a layer thickness can be easily and accurately formed.
• the manufacturing method of the sound absorbing structure includes the interior plate 2a (the interior member) having the opening 5 and the closing plate that is disposed to face the interior plate 2a at an interval.
• 1 anterior member
• a connecting member 13 that connects the interior plate 2a and the closing plate 1 to form a hollow portion communicating with the external space through the opening 5, and a hollow portion 6 formed of two or more second members.
• Perforated plates 61 and 62 that partition the space (Second partition member), the interior plate 2a is an uneven plate integrated with the connecting member 13 and having an uneven portion formed by the connecting member 13, and the closing plate 1 has one of the uneven portions.
• a method for manufacturing a sound-absorbing structure which is a closed plate joined so as to be closed, wherein support holes 61b 'and 62b are formed in perforated plates 61 and 62, and the support holes 61b' and 62b are formed on convex portions of the uneven plate.
• the perforated plates 61 and 62 are provided in the hollow portion 6 by supporting and fixing the support hole by the convex portion during the passage and the passage.
• FIG. 'It is good to form 62c.
• a metal plate such as iron or aluminum is pressed, the opening 5 is punched out, and the connecting member 13 is formed at the same time, whereby the interior plate 2a is created.
• the connecting member 13 is a flat plate formed from one end to the other end of the metal plate.
• a metal plate on which small-diameter through-holes 6 la '62 a are formed in advance is prepared, and fitting projections 61 c' 62 c are formed by press working similarly to the interior plate 2 a, whereby the first porous plate 61 And the second perforated plate 62 are respectively formed.
• the fitting protrusion 61c has a size capable of fitting the connecting member 13, and the fitting protrusion 62c has a size capable of fitting the connecting member 13 and the fitting protrusion 61c.
• the through holes 16a'62a may be formed by press working simultaneously with the fitting projections 61c'62c.
• the first perforated plate 61 is covered from above the interior plate 2a, and the connecting member 13 is fitted to the fitting projection 61c. Then, when the fitting convex portion 61c is in contact with and supported by the top portion 13a and the side surface portion 13b of the connecting member 13, the second perforated plate 62 is subsequently covered from above the first perforated plate 61. 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 porous plate 62 are positioned and fixed. .
• the fixing may be performed by an adhesive.
• the closing plate 1 is placed on the fitting projection 62c of the second porous plate 62, and is fixed by an adhesive or the like.
• 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 closing plate is provided on the top of the fitting protrusion 62c.
• a sound-absorbing structure having section spaces 8, 9, and 10 having a layer thickness can be easily and accurately created.
• the connecting member 13 is fixed by the fitting projections 61c'62c
• the connecting member 13 is fixed by the support holes 6lb'62b.
• the connecting member 13 can be formed in a flat plate shape, and a sound absorbing structure according to the situation can be created.
• the interior plate 2a (the interior member) having the opening 5 is disposed so as to face the interior plate 2a at an interval.
• a connecting member 13 that connects the closing plate 1 (exterior member), the inner plate 2a, and the closing plate 1 to form a hollow portion communicating with the external space through the opening 5 and a hollow portion 6
• a perforated plate 61/62 (second partition member) for partitioning into two partition spaces, and the interior plate 2a is integrated with the connecting member 13 and is an uneven plate having an uneven portion formed by the connecting member 13.
• the closing plate 1 is a method for manufacturing a sound absorbing structure which is a closing plate joined so as to close one of the concave and convex portions, wherein the fitting convex portions 61c 'and 62c are formed on the perforated plates 61 and 62, The fitting convex portion 61c '62c is fitted to the convex portion of the uneven plate, and the convex portion 61c' 62c is supported and fixed by the convex portion during the fitting, so that the perforated plate 61c is formed.
• ⁇ 62 is provided in the hollow part 6.
• the sound absorbing characteristics of the sound absorbing structure of the first embodiment were simulated. Specifically, as shown in Fig. 1, the layer thickness dl'd2 of the sectional spaces 8 and 9 is 8mm'8mm, the aperture ratio j3 of the through holes lla '12a of the perforated plates 11 and 12 is 1%, respectively.
• the thickness t is 0.3 mm
• the hole diameter of the through hole 1 la '12a is 0.5 mm
• the opening ratio j3 of the opening 5 is 7.3%
• the thickness t is 0.7 mm
• the hole diameter is 2 mm.
• the resonance frequency around 1800Hz it has a resonance frequency around 4050Hz. It has a high sound absorption coefficient over a wide range.
• the sound absorption characteristics of a sound absorbing structure similar to that of the third embodiment were simulated. Specifically, when the parameters are set to the parameters of Example 1 and the double aluminum foil is used 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 used. Thus, it has a high suction rate in the resonance frequency range from about 3200 Hz to about 3200 Hz, and has a high sound absorption rate in a very wide range as compared with the case where no perforated plate is provided.
• FIG. 1 is a schematic configuration diagram of a sound absorbing structure.
• FIG. 2 is an exploded perspective view of a sound absorbing structure.
• FIG. 3 is a schematic configuration diagram of a sound absorbing structure.
• FIG. 4 is a schematic configuration diagram of a sound absorbing structure.
• FIG. 5 is a schematic configuration diagram of a sound absorbing structure.
• FIG. 6 is an exploded perspective view of the sound absorbing structure.
• Fig. 7 is a schematic configuration diagram of a sound absorbing structure.
• Fig. 8 is a schematic configuration diagram of a sound absorbing structure.
• FIG. 10 is a graph showing sound absorption characteristics.
• FIG. 11 is a schematic configuration diagram of a sound absorbing structure of a modified example.
• FIG. 12 is a schematic configuration diagram of a sound absorbing structure of a modified example.
• FIG. 13 is a schematic configuration diagram of a sound absorbing structure of a modified example.
• FIG. 14 is a schematic configuration diagram of a sound absorbing structure.
• FIG. 15 is a schematic configuration diagram of a sound absorbing structure of a modified example.
• FIG. 16 is an exploded perspective view of the sound absorbing structure.
• FIG. 17 is an exploded perspective view of the sound absorbing structure.

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• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Acoustics & Sound (AREA)
• Multimedia (AREA)
• Soundproofing, Sound Blocking, And Sound Damping (AREA)
• Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
• Building Environments (AREA)

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• 2004
  • 2004-08-31 KR KR1020067004401A patent/KR100787297B1/ko active IP Right Grant
  • 2004-08-31 US US10/569,135 patent/US20060289229A1/en not_active Abandoned
  • 2004-08-31 CN CNA200480025501XA patent/CN1846251A/zh active Pending
  • 2004-08-31 EP EP04772520A patent/EP1662480A4/de not_active Withdrawn
  • 2004-08-31 WO PCT/JP2004/012564 patent/WO2005024778A1/ja active Application Filing

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