WO2016185907A1 - 多孔板 - Google Patents

多孔板 Download PDF

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Publication number
WO2016185907A1
WO2016185907A1 PCT/JP2016/063587 JP2016063587W WO2016185907A1 WO 2016185907 A1 WO2016185907 A1 WO 2016185907A1 JP 2016063587 W JP2016063587 W JP 2016063587W WO 2016185907 A1 WO2016185907 A1 WO 2016185907A1
Authority
WO
WIPO (PCT)
Prior art keywords
hole
plate
diameter portion
perforated plate
hole diameter
Prior art date
Application number
PCT/JP2016/063587
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
善三 山口
伊知郎 山極
Original Assignee
株式会社神戸製鋼所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社神戸製鋼所 filed Critical 株式会社神戸製鋼所
Priority to CN201680028712.1A priority Critical patent/CN107615375B/zh
Priority to EP16796301.6A priority patent/EP3300073A4/en
Publication of WO2016185907A1 publication Critical patent/WO2016185907A1/ja

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    • 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 relates to a perforated plate.
  • Patent Document 1 discloses a technique related to a perforated plate as a soundproof material for vehicles and the like.
  • the porous sound absorbing structure described in Patent Document 1 has a large number of through holes so that an air layer is formed between the outer material (outer material) and the inner material (inner material) on the hollow portion side surface.
  • a reinforcing plate material having the above is attached.
  • the reinforcing plate material having a large number of through-holes imparts sound absorption to the hollow portion. According to this porous sound absorbing structure, it is possible to easily widen a frequency range having a large sound absorption coefficient without attaching a fiber-based sound absorbing material to the lower surface of the inner material (inner material).
  • Patent Document 1 There is no direct description in Patent Document 1 regarding the specific detailed shape of the through hole formed in the reinforcing plate.
  • punching is exemplified in paragraph 0054 of Patent Document 1.
  • the hole opened by the punching process is a cylindrical hole having the same cross-sectional area from the front surface to the back surface of the plate material. That is, it can be said that Patent Document 1 discloses a porous plate having a large number of cylindrical holes having the same cross-sectional area from the front surface to the back surface of the plate material.
  • the number of through holes formed in the porous plate is small regardless of whether the porous plate is also used as a reinforcing plate. This is because if a large number of through holes are formed in the plate, the strength of the plate is reduced accordingly. On the other hand, if the number of through-holes is simply reduced, the sound absorption rate is lowered. Further, there is a problem that the cost of drilling increases when the number of through holes is increased. Furthermore, when the number of through holes is increased too much, there is a problem that adjacent through holes interfere with each other.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a perforated plate capable of obtaining a high sound absorption coefficient with a smaller number of through holes than in the prior art.
  • the present invention is a perforated plate having a large number of through holes arranged so that an air layer is formed between a plate-shaped or wall-shaped blocking member.
  • the through-hole has a maximum hole diameter portion formed on one surface of the perforated plate and a minimum hole diameter portion formed on the other surface of the perforated plate, and a cross section in the plate thickness direction of the perforated plate In view, it swells outward from a straight line connecting the maximum hole diameter portion and the minimum hole diameter portion.
  • the plate thickness direction (direction in which sound waves pass) of each portion of the through hole that affects the propagation of sound waves The thickness is smaller than when the hole cross-sectional shape is formed in a straight line. That is, according to the shape of the through-hole according to the present invention, the thickness in the plate thickness direction of each part of the through-hole is compared at the same hole diameter compared to the case where the hole cross-sectional shape is formed in a straight line. If it becomes smaller. Thereby, a high sound absorption coefficient can be obtained even with a small number of through holes.
  • FIG. 1 It is sectional drawing which shows a porous sound absorption structure provided with the porous plate which concerns on one Embodiment of this invention. It is an enlarged view of the through-hole part of the perforated plate shown in FIG. It is a graph which shows the relationship between the flow resistance of a perforated plate, and the frequency of a sound wave. It is sectional drawing which shows two embodiment of the through-hole of a perforated plate. It is sectional drawing which shows embodiment of the through-hole of a perforated plate. It is a graph which shows the sound absorption coefficient comparison result of the through-hole 7 shown in FIG. 4 and the through-hole which does not have a bulge which concerns on a comparative example. It is a graph which shows the comparison result of the number of the holes in which the through-holes 6 and 7 shown in FIG.
  • a porous plate 1 As shown in FIG. 1, a porous plate 1 according to an embodiment of the present invention is provided between an obstruction member 2 so that an air layer 3 is formed between the obstruction member 2 having a plate shape or a wall shape. They are arranged at a predetermined interval. Note that the air layer 3 communicates with the outside only in a large number of through-holes 4 of the perforated plate 1. That is, for example, the end of the perforated plate 1 and the closing member 2 are connected and closed by a plate having no through hole or the like.
  • the closing member 2 is a member that is not perforated, that is, the front surface and the back surface are not in communication. Further, the closing member 2 is disposed on the opposite side of the noise source 5 with the perforated plate 1 interposed therebetween.
  • the material of the perforated plate 1 and the closing member 2 is aluminum, aluminum alloy, stainless steel, iron, resin or the like.
  • FIG. 2 is an enlarged view of the through hole 4 portion of the perforated plate 1 shown in FIG.
  • the through-hole 4 has a maximum hole diameter portion 11 formed on one surface S1 of the porous plate 1 and a minimum hole diameter portion 12 formed on the other surface S2. That is, the through hole 4 is a through hole in which the diameter is different between the front surface and the back surface of the porous plate 1 and the diameter of the hole is maximum (Dmax) and minimum (Dmin) on the front and back surfaces of the hole.
  • Dmin (minimum pore diameter) is set to a thickness t or less of the porous plate 1.
  • the minimum value of Dmin is 0.01 mm.
  • the hole diameter: 0.01 mm is a diameter at which the sound absorption rate is not improved due to the influence of excessive attenuation. That is, Dmin (minimum hole diameter) is 0.01 mm or more and a plate thickness t or less.
  • Dmax maximum hole diameter
  • Dmin minimum hole diameter
  • the hole pitch is the distance between the centers of adjacent holes.
  • the wall surface of the through hole 4 between the maximum hole diameter portion 11 and the minimum hole diameter portion 12 connects the maximum hole diameter portion 11 and the minimum hole diameter portion 12 in a cross-sectional view of the porous plate 1 in the thickness t direction.
  • the straight line L that is, one edge portion of the maximum hole diameter portion 11 and one straight edge portion of the minimum hole diameter portion 12 on the same side as this edge portion is set radially outward from the straight line L. That is, the through hole 4 has a shape that swells outward in the radial direction from the straight line L.
  • the cross-sectional area of the through-hole 4 is such that the cross-sectional area increases from one surface S1 of the porous plate 1 where the maximum hole diameter portion 11 is formed to the other surface S2 of the porous plate 1 where the minimum hole diameter portion 12 is formed. Are the same or the cross-sectional area is reduced. In the embodiment shown in FIG. 2, the same cross-sectional area (the maximum cross-sectional area is maintained) from the maximum hole diameter portion 11 to the wall surface position 13 below the same, and thereafter, the cross-sectional area continuously increases as it approaches the other surface S2. It is gradually made smaller.
  • the maximum point is that the shape of the through-hole 4 swells outward from a straight line L connecting the maximum hole diameter portion 11 and the minimum hole diameter portion 12 in a cross-sectional view of the porous plate 1 in the thickness t direction. That is.
  • the plate thickness ta2 when the thicknesses ta1 and ta2 are given to the plate thicknesses at the same hole diameter in the middle of the hole, the plate thickness ta2 ⁇ the plate thickness ta1 as shown in FIG.
  • the thickness in the plate thickness direction of each portion of the through hole 4 of the perforated plate 1 is smaller when the through holes are compared at the same hole diameter than in the case of the holes not expanded outward shown by the straight line L.
  • the position in the plate thickness t direction having the same hole diameter is on the minimum diameter side.
  • the through-hole 4 In the cross-sectional view of the thickness t direction of the perforated plate 1, many portions of the through-hole 4 are curved and the wall surface of the hole is formed. May be formed (the cross-sectional area may be reduced discontinuously from the surface S1 toward the surface S2). That is, the through-hole 4 only needs to have the same or smaller cross-sectional area as it goes from the surface S1 to the surface S2, and the wall surface of the through-hole 4 has a straight line and a curved line in the cross-sectional view in the plate thickness t direction of the porous plate 1. Combinations may be used, all may be curves (including combinations of curves having different curvatures), or all may be combinations of straight lines.
  • the through hole 4 having a larger hole diameter (cross-sectional area) may be the noise source 5 side, and conversely, the hole diameter (cross-sectional area) of the through hole 4.
  • the smaller one may be on the noise source 5 side.
  • the reason for this is as follows.
  • the sound absorption effect is determined by the pressure drop of the festival where sound waves pass through the hole. This is because the pressure loss is determined by the smallest part of the hole, so that the same sound absorption effect can be exhibited regardless of whether the noise source 5 side is smaller or larger.
  • Fig. 3 is a graph showing the relationship between the flow resistance and the frequency. As shown in FIG. 3, when the plate thickness is large, the flow resistance Rt is larger than when the plate thickness is small. If the resistance Rt is large, it is necessary to increase the aperture ratio ⁇ (the number of holes) of the perforated plate for obtaining optimal attenuation to reduce the attenuation. Therefore, when the plate thickness is large, it is necessary to increase the aperture ratio ⁇ .
  • the thickness of each part of the through hole 4 in the thickness direction is:
  • the through holes are smaller when the through-hole portions are compared at the same hole diameter, and the same effect as when the thickness of the perforated plate is reduced can be obtained.
  • the number of through holes 4 that achieve the same sound absorption rate can be reduced. This makes it possible to obtain a high sound absorption coefficient with a small number of through holes.
  • the effects accompanying this there are the effects of reducing the hole machining cost, avoiding interference between adjacent through holes, and improving the strength of the porous plate.
  • the part that greatly contributes to obtaining the same effect as reducing the thickness of the perforated plate is the lower part B of the through hole 4, which is the peripheral part of the minimum hole diameter part 12 of the through hole 4.
  • the hole bulges outside the straight line L in the hole lower part B when the hole is curved in a concave shape (or may be a straight line)
  • the plate in each part of the through hole 4 from the surface S1 to the surface S2 The thickness tends to be small.
  • FIG. 4 shows two embodiments of through holes.
  • the maximum swollen position (the surface of the perforated plate 1) of the portion that bulges outward from the straight line L connecting the maximum hole diameter portion 11 and the minimum hole diameter portion 12 of the through hole. It is preferable that the position where the maximum bulge amount ⁇ a is in the direction parallel to S1 and S2) is the central position in the plate thickness t direction of the porous plate 1 or the position on the minimum hole diameter portion 12 side of the central position.
  • the maximum bulge position 14 is the center position in the plate thickness t direction of the porous plate 1.
  • the maximum bulge position 15 (position where the maximum bulge amount ⁇ b is parallel to the planes S1 and S2 of the porous plate 1) is smaller than the center position in the plate thickness t direction. It is the portion 12 side and is a position of 1/4 ⁇ t from the surface S2 on the minimum hole diameter portion 12 side.
  • the minimum hole diameter portion 12 has a thickness.
  • the thickness td of the minimum hole diameter portion 12 is set to a predetermined thickness equal to or smaller than the hole diameter Dmin of the minimum hole diameter portion 12.
  • FIG. 6 shows the through hole 7 shown in FIG. 4 and a through hole without a bulge according to a comparative example (a conical through hole in which the maximum hole diameter portion 11 and the minimum hole diameter portion 12 are connected by a straight line L in a cross-sectional view). It is a graph which shows a sound absorption coefficient comparison result with.
  • the present invention is the through hole 7 (an example of the embodiment) shown in FIG.
  • the aperture ratio of the perforated plate having each through hole was set to the same 0.5%.
  • the through-hole 7 according to the present invention (the porous plate 1 having a large number of through-holes 7) is more than the through-hole without a bulge according to the comparative example (the porous plate having the through-hole without bulge).
  • the sound absorption rate can be greatly improved.
  • FIG. 7 shows a through-hole 6, 7 shown in FIG. 4 and a non-bulging through-hole according to a comparative example (a conical through-hole in which the maximum hole diameter portion 11 and the minimum hole diameter portion 12 are connected by a straight line L in a sectional view). It is a graph which shows the comparison result of the number of the holes in which the sound absorption coefficient is the same as (hole).
  • the vertical axis of the graph shown in FIG. 7 indicates the through-hole 6 according to the present invention when the number of holes in the case of a through-hole without a bulge according to the comparative example (a porous plate having a through-hole without bulge) is 100%.
  • 7 perforated plate 1 having a large number of through-holes 6 or 7.
  • the horizontal axis of the graph represents the bulge amount at the maximum bulge positions 14 and 15 of the through holes 6 and 7, respectively.
  • the through-holes 6 and 7 (the porous plate 1 having a large number of through-holes 6 or 7) according to the present invention have a through-hole without a bulge according to the comparative example (a through-hole without a bulge).
  • the number of holes is smaller when achieving the same sound absorption rate than the perforated plate).
  • the through hole 7 In comparison between the case of the through hole 6 (maximum bulge position: 1/2 ⁇ t from the surface S2) and the case of the through hole 7 (maximum bulge position: 1/4 ⁇ t from the surface S2), the through hole 7 If the case achieves the same sound absorption rate, the number of holes is smaller. That is, the number of holes can be smaller as the maximum bulge position is closer to the minimum hole diameter portion 12.
  • Each through hole of the porous plate according to the present invention has a maximum hole diameter portion formed on one surface of the porous plate and a minimum hole diameter portion formed on the other surface of the porous plate, In a cross-sectional view in the plate thickness direction of the perforated plate, the perforated plate swells outward from a straight line connecting the maximum hole diameter portion and the minimum hole diameter portion.
  • the thickness in the plate thickness direction of each part of the through hole of the perforated plate is smaller when the through hole parts are compared at the same hole diameter than when the hole cross-sectional shape is formed in a straight line. .
  • the same effect as that obtained by reducing the thickness of the porous plate can be obtained, so that a high sound absorption coefficient can be obtained even with a small number of through holes.
  • the maximum bulge position of the portion of the through hole that bulges outward from the straight line connecting the maximum hole diameter portion and the minimum hole diameter portion is
  • the center position in the thickness direction of the perforated plate or a position closer to the minimum pore diameter side than the center position is preferable. According to this configuration, a high sound absorption coefficient can be obtained with a smaller number of through holes.
  • the minimum hole diameter portion has a thickness equal to or smaller than the hole diameter of the minimum hole diameter portion. According to this configuration, sufficient strength in the vicinity of the minimum hole diameter portion can be ensured. Moreover, the effect that the hole processing is easier to perform than the sharp structure of the minimum hole diameter portion is also obtained.
  • perforated plate 2 blocking member 3: air layer 4: through-hole 11: maximum hole diameter part 12: minimum hole diameter part L: straight line connecting the maximum hole diameter part 11 and the minimum hole diameter part 12: one surface S2: the other Surface t: thickness

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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)
  • Superstructure Of Vehicle (AREA)
  • Building Environments (AREA)
PCT/JP2016/063587 2015-05-19 2016-05-02 多孔板 WO2016185907A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201680028712.1A CN107615375B (zh) 2015-05-19 2016-05-02 多孔板
EP16796301.6A EP3300073A4 (en) 2015-05-19 2016-05-02 HOLE PLATE

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015101502A JP6495094B2 (ja) 2015-05-19 2015-05-19 多孔板
JP2015-101502 2015-05-19

Publications (1)

Publication Number Publication Date
WO2016185907A1 true WO2016185907A1 (ja) 2016-11-24

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PCT/JP2016/063587 WO2016185907A1 (ja) 2015-05-19 2016-05-02 多孔板

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EP (1) EP3300073A4 (zh)
JP (1) JP6495094B2 (zh)
CN (1) CN107615375B (zh)
WO (1) WO2016185907A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11254087B2 (en) * 2017-04-26 2022-02-22 Corning Incorporated Micro-perforated glass laminates and methods of making the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019059046A1 (ja) * 2017-09-25 2019-03-28 富士フイルム株式会社 防音構造体
JP2021018357A (ja) * 2019-07-22 2021-02-15 株式会社デンソー 吸音装置
GB2605371A (en) * 2021-03-29 2022-10-05 Bae Systems Plc Acoustic absorbing structures
AT526400B1 (de) * 2022-07-29 2024-05-15 Admonter Holzindustrie Ag Bauplatte

Citations (2)

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JPS5288301A (en) * 1976-01-19 1977-07-23 Hiroshi Kofujita Surge direction transmissive device
JP2008544119A (ja) * 2005-06-14 2008-12-04 キム，ヨンーオク 吸音パネル

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JPH0823753B2 (ja) * 1986-04-24 1996-03-06 松下電工株式会社 消音装置
US5504281A (en) * 1994-01-21 1996-04-02 Minnesota Mining And Manufacturing Company Perforated acoustical attenuators
JP3149366B2 (ja) * 1996-10-14 2001-03-26 ユニプレス株式会社 通気型遮音壁構造
EP1408483A4 (en) * 2001-06-21 2008-06-11 Kobe Steel Ltd POROUS SOUNDPROOF STRUCTURAL BODY AND METHOD FOR THE PRODUCTION THEREOF
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AT413406B (de) * 2003-08-18 2006-02-15 Holzindustrie Leitinger Ges M Schallabsorbierendes element
EP1742201A4 (en) * 2004-04-30 2017-07-19 Kabushiki Kaisha Kobe Seiko Sho Porous sound absorbing structure
JP2007291834A (ja) * 2006-03-31 2007-11-08 Yamaha Corp 吸音パネル及び吸音パネルの製造方法
CN2896509Y (zh) * 2006-05-16 2007-05-02 启碁科技股份有限公司 离子枪消音装置
KR100790221B1 (ko) * 2007-04-17 2008-01-02 임기태 내장재와 조립되는 공명흡음구조 몰딩 및 흡음 음향조절구조
KR101840581B1 (ko) * 2008-04-14 2018-03-20 쓰리엠 이노베이티브 프로퍼티즈 컴파니 다층 흡음 시트
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Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5288301A (en) * 1976-01-19 1977-07-23 Hiroshi Kofujita Surge direction transmissive device
JP2008544119A (ja) * 2005-06-14 2008-12-04 キム，ヨンーオク 吸音パネル

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11254087B2 (en) * 2017-04-26 2022-02-22 Corning Incorporated Micro-perforated glass laminates and methods of making the same

Also Published As

Publication number Publication date
EP3300073A4 (en) 2019-01-09
CN107615375A (zh) 2018-01-19
JP2016218197A (ja) 2016-12-22
EP3300073A1 (en) 2018-03-28
CN107615375B (zh) 2020-09-22
JP6495094B2 (ja) 2019-04-03

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