JP2000250561A - Sound absorbing structure - Google Patents
Sound absorbing structureInfo
- Publication number
- JP2000250561A JP2000250561A JP11049766A JP4976699A JP2000250561A JP 2000250561 A JP2000250561 A JP 2000250561A JP 11049766 A JP11049766 A JP 11049766A JP 4976699 A JP4976699 A JP 4976699A JP 2000250561 A JP2000250561 A JP 2000250561A
- Authority
- JP
- Japan
- Prior art keywords
- sound
- sound absorbing
- thin film
- absorbing material
- sound absorber
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Landscapes
- Laminated Bodies (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、吸音構造体に関す
る技術分野に属する。TECHNICAL FIELD The present invention belongs to the technical field of a sound absorbing structure.
【０００２】[0002]
【従来の技術】従来の最も多く普及している吸音材とし
ては、グラスウール等の軟質繊維系多孔質吸音材があげ
られる。図1のａに示すように、グラスウールの厚みが
１５０ｍｍの場合、周波数全体平均では極めて高い残響
室法吸音率を示すが、１００Hｚと1２５Hzの低周波数に
おいては、必ずしも十分とはいえない。2. Description of the Related Art Soft fiber type porous sound absorbing materials such as glass wool are the most widely used conventional sound absorbing materials. As shown in FIG. 1A, when the thickness of the glass wool is 150 mm, the average over the entire frequency shows a very high reverberation chamber sound absorption coefficient, but it is not always sufficient at a low frequency of 100 Hz and 125 Hz.
【０００３】また、図1のｂに、板厚：６ｍｍ、あな寸
法：９ｍｍφ―１５ｍｍピッチ、背後空気層１５０ｍｍ
（下地材料：ロックウール；25ｍｍ）の場合のあなあき
珪酸カルシウム板の残響室法吸音率を示す（出展：騒音
・振動対策ハンドブック、６１９頁：社団法人 日本音
響材料協会編 技報堂出版株式会社 １９９６年版）。
この場合においても、２００Hｚ以下の低周波数帯域に
おいては、必ずしも十分とはいえない。FIG. 1B shows a sheet thickness: 6 mm, hole dimensions: 9 mmφ-15 mm pitch, a back air layer 150 mm
Shows the reverberation chamber method sound absorption of a perforated calcium silicate plate in the case of (base material: rock wool; 25 mm). ).
Also in this case, it is not always sufficient in a low frequency band of 200 Hz or less.
【０００４】[0004]
【発明が解決しようとする課題】前記したように、従来
型の吸音材を用いた場合においては、軟質繊維系多孔質
吸音材の場合で１５０ｍｍ厚みの充填層を確保した場合
においても、また、あなあき珪酸カルシウム板において
は、１５０ｍｍ厚みの背後空気層を確保した上にさらに
２５ｍｍ厚みのロックウールを用いた場合においても、
３００Hz以下の残響室法吸音率は必ずしも十分とはいえ
ない。As described above, in the case where the conventional sound absorbing material is used, even when the filling layer having a thickness of 150 mm is secured in the case of the soft fiber type porous sound absorbing material, In the perforated calcium silicate plate, even if a 250 mm thick rock wool is used after securing a 150 mm thick back air layer,
The reverberation method sound absorption coefficient of 300 Hz or less is not always sufficient.
【０００５】ところで、大型機械やボイラー等において
は４００Hz以上の中高周波数帯域の騒音のみならず３０
０Hz以下の低周波数帯域の騒音対策が急がれている。ま
た、発電所や変電所等の変圧器に対しては３００Hz以下
の騒音対策が急がれている。[0005] By the way, in a large machine, a boiler, and the like, not only noise in the middle and high frequency bands of 400 Hz or more but also 30
Noise measures in the low frequency band below 0 Hz are urgently needed. In addition, noise measures at 300 Hz or less are urgently required for transformers such as power plants and substations.
【０００６】本発明の目的は、前記従来技術の問題点を
解決することにあり、１００ｍｍから１５０ｍｍの比較
的小さな充填層（パネル厚み）にもかかわらず、中高周
波数帯域のみならず３００Hz以下の低周波数帯域におけ
る吸音率の優れた吸音構造体を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art. In spite of a relatively small filling layer (panel thickness) of 100 mm to 150 mm, not only a medium-high frequency band but also a low frequency band of 300 Hz or less. An object of the present invention is to provide a sound absorbing structure having an excellent sound absorption coefficient in a frequency band.
【０００７】[0007]
【課題を解決するための手段】本発明者等は、多数の開
口を有しかつ互いに開口率の異なる板状体で、樹脂薄膜
を挟持してなることを特徴とする膜振動吸音材（特開平
６−８３３６５号公報）を、また、前記膜振動吸音材を
用いた、膜振動吸音体および吸音方法（特開平１０−２
２２１７０号公報）を、また、前記膜振動吸音材を用い
た、防音壁および防音壁頂部消音装置（特願平１０−２
８０７６０号公報）を開示している。Means for Solving the Problems The present inventors have proposed a membrane vibration-absorbing material characterized in that a resin thin film is sandwiched between plate-like bodies having a large number of openings and having mutually different aperture ratios. Japanese Unexamined Patent Publication No. Hei 6-83365) and a membrane vibration absorber and a sound absorbing method using the above membrane vibration absorber (Japanese Patent Laid-Open No. 10-2).
No. 22170) and a soundproofing wall and a soundproofing device at the top of the soundproofing wall using the above-mentioned membrane vibration absorbing material (Japanese Patent Application No. 10-2).
No. 80760).
【０００８】以上の研究開発知見を基に、さらに検討を
重ねた結果、前記膜振動吸音材と従来の軟質繊維系多孔
質吸音材もしくは連続気泡型弾性フォーム吸音材を組み
合わせることにより、周波数4００Hz以上の中高周波数
帯域のみならず、１００Hzから３００Hzの低周波数帯域
の吸音にも優れた吸音特性を発現する吸音構造体を見出
した。As a result of further studies based on the above research and development knowledge, the combination of the membrane vibration sound absorber and the conventional soft fiber porous sound absorber or open cell type elastic foam sound absorber has a frequency of 400 Hz or more. The present inventors have found a sound absorbing structure that exhibits excellent sound absorbing characteristics not only in the middle and high frequency bands but also in the low frequency band of 100 Hz to 300 Hz.
【０００９】本発明の第一の態様は、少なくとも一枚の
多数の開口を有する板状体と少なくも一枚の薄膜とを積
層してなる膜振動吸音材を音源側に配設、この膜振動吸
音材の背後に軟質繊維系多孔質吸音材もしくは連続気泡
型弾性フォーム吸音材を配設、さらに反音源側に遮音板
を配設して構成され、振動する空気粒子による膜振動に
基づく吸音作用と、振動する空気粒子が細孔内を通過す
る摩擦抵抗に基づく吸音作用、および、前記軟質繊維系
多孔質吸音材もしくは連続気泡型弾性フォーム吸音材が
バネとして作用することにより膜振動吸音材に及ぼす吸
音作用の相乗効果により、周波数4００Hz以上の中高周
波数帯域のみならず、１００Hzから３００Hzの低周波数
帯域の吸音を目的とすることを特徴とする、吸音構造体
である。According to a first aspect of the present invention, a film vibration-absorbing material, which is formed by laminating at least one plate-like body having a large number of openings and at least one thin film, is disposed on the sound source side. A soft fiber porous sound absorbing material or open-cell elastic foam sound absorbing material is provided behind the vibration sound absorbing material, and a sound insulating plate is provided on the anti-sound source side. Sound absorption based on membrane vibration by vibrating air particles Action, sound absorbing action based on frictional resistance of vibrating air particles passing through the pores, and membrane vibration sound absorbing material by the soft fiber porous sound absorbing material or open-cell elastic foam sound absorbing material acting as a spring. The sound absorbing structure is characterized in that the sound absorbing structure has a synergistic effect of a sound absorbing effect on not only a middle and high frequency band of 400 Hz or more but also a low frequency band of 100 Hz to 300 Hz.
【００１０】本発明の第二の態様は、前記第一の態様に
記載の薄膜が樹脂製の薄膜であることを特徴とする、吸
音構造体である。A second aspect of the present invention is a sound absorbing structure, wherein the thin film according to the first aspect is a resin thin film.
【００１１】本発明の第三の態様は、前記第一の態様に
記載の薄膜が金属製の薄膜であることを特徴とする、吸
音構造体である。A third aspect of the present invention is a sound absorbing structure, wherein the thin film according to the first aspect is a metal thin film.
【００１２】[0012]
【発明の実施の形態】以下、本発明の吸音構造体につい
て、添付の図面を参照して詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a sound absorbing structure of the present invention will be described in detail with reference to the accompanying drawings.
【００１３】なお、以下の説明において、膜振動吸音材
とは多数の開口を有する板状体と樹脂薄膜との板状積層
体である。In the following description, the film vibration-absorbing material is a plate-like laminate of a plate-like body having a large number of openings and a resin thin film.
【００１４】また、連続気泡型弾性フォーム吸音材と
は、樹脂製の非常に緻密な内部セル（細孔）構造を有
し、これらのセル（細孔）が互いに繋がりあって材料の
表裏面を空気が通過できる構造（オープンセル）をした
発砲体であり、音波（振動する空気粒子）は、この細孔
内を通過する際摩擦抵抗を受けて熱エネルギーに変換さ
れ吸音される。An open-cell elastic foam sound-absorbing material has a very dense internal cell (pore) structure made of resin, and these cells (pores) are connected to each other so that the front and back surfaces of the material can be formed. It is a foam that has a structure (open cell) through which air can pass. Sound waves (vibrating air particles) receive frictional resistance when passing through the pores, are converted into thermal energy, and are absorbed.
【００１５】さて、本発明に用いる膜振動吸音材は、本
発明者等が前記特開平１０―２２２１７０号公報で提案
しているように、多数の開口を有する板状体と樹脂薄膜
とを、少なくとも一枚ずつ積層した積層体であるが、吸
音特性および機械的強度を考慮すると図2（ａ）、およ
び、このｂ−ｂ線断面図である図2（ｂ）に示されるよ
うに、樹脂薄膜2４を、多数の開口を有する板状体2２
（以下、板状体2２とする）で挟持した層構成を、少な
くとも１つは有するのが好ましい。The membrane vibration-absorbing material used in the present invention comprises a plate-like body having a large number of openings and a resin thin film, as proposed by the present inventors in the above-mentioned JP-A-10-222170. Although it is a laminated body laminated at least one by one, as shown in FIG. 2 (a) and FIG. 2 (b), which is a cross-sectional view taken along the line bb, in consideration of sound absorption characteristics and mechanical strength. The thin film 24 is formed into a plate-like body 22 having many openings.
(Hereinafter, it is preferable to have at least one layer configuration sandwiched between the plate-like bodies 22).
【００１６】また、図2（ｃ）に示すように、一方の板
状体の表面を樹脂薄膜で覆ってもよい。さらに、図2
（ｄ）に示すように、図2（ｂ）に示す構成の両面を樹
脂薄膜2４で覆ってもよい。このような構成とすること
により、特に、金属製の板状体2２を用いる本発名の膜
振動吸音材においては、板状体2２を雨や腐食雰囲気か
ら保護するので、板状体の耐候性が大幅に向上する。Further, as shown in FIG. 2 (c), the surface of one plate-like body may be covered with a resin thin film. Furthermore, FIG.
As shown in (d), both surfaces of the configuration shown in FIG. 2 (b) may be covered with the resin thin film 24. By adopting such a configuration, in particular, in the case of the membrane vibration-absorbing material of the present invention using a metal plate-shaped body 22, the plate-shaped body 22 is protected from rain and corrosive atmosphere, so that the weather resistance of the plate-shaped body is improved. The performance is greatly improved.
【００１７】なお、本発明に用いる膜振動吸音体の層構
成は以上の例に限定はされず、例えばさらに板状体2２
や樹脂薄膜2４を積層してもよく、あるいは２枚の樹脂
薄膜２４を板状体２２で挟持する等、複数の樹脂薄膜２
４で構成してもよい。The layer structure of the membrane vibration absorber used in the present invention is not limited to the above example.
Or a plurality of resin thin films 24, or two resin thin films 24 sandwiched between plate-like members 22.
4 may be used.
【００１８】本発明に用いる膜振動吸音材を構成する板
状体２２の材料には特に限定はなく、各種の材料が利用
可能であるが、好ましくは、アルミニウム、鋼等の各種
の金属材料、ステンレス等の合金材料、後述する樹脂薄
膜２４で例示される材料等の各種の樹脂材料が例示され
る。There is no particular limitation on the material of the plate-like body 22 constituting the membrane vibration-absorbing material used in the present invention, and various materials can be used. Preferably, various metal materials such as aluminum and steel, Various resin materials such as an alloy material such as stainless steel and a material exemplified by the resin thin film 24 described later are exemplified.
【００１９】また、板状体２２としては、より具体的に
は、前記各種の材料で形成される、金属板を孔開け加工
してなるパンチングメタル、金属製の網、エキスパンド
メタル（ラス網）、樹脂製の網や孔開き板等が例示され
る。また、板状体２２は、同じ材料のものを用いてもよ
く、あるいは、パンチングメタルと樹脂製の網で樹脂薄
膜２４を挟持した構成のように、異なる板状体を複数種
用いてもよい。More specifically, as the plate-like body 22, more specifically, a punching metal formed by punching a metal plate, a metal net, an expanded metal (lath net) formed of the various materials described above. And a resin net or a perforated plate. The plate 22 may be made of the same material, or a plurality of different plates may be used, such as a configuration in which a resin thin film 24 is sandwiched between a punching metal and a resin net. .
【００２０】さらに、図２に示されるように、複数枚の
板状体を用いる場合には、開口の大きさ（単位面積当た
りの開口率）が同じでも互いに異なるものを用いてもよ
い。開口率の異なる板状体を用いることにより、より良
好な吸音特性を得ることができる。Further, as shown in FIG. 2, when a plurality of plate-like members are used, openings having the same size (opening ratio per unit area) or different openings may be used. By using plate members having different aperture ratios, better sound absorbing characteristics can be obtained.
【００２１】ここで、板状体として、エキスパンドメタ
ルや金網等の板材面に捻じれや凹凸を有すものを用いる
場合には、プレス加工やローラー加工等を施して、表面
の凹凸を平坦にして使用するのが好ましい。Here, in the case where a plate-shaped body having twisted or uneven surface such as expanded metal or wire mesh is used, the surface is flattened by press working or roller working. It is preferable to use it.
【００２２】本発明に用いる膜振動吸音材においては、
板状体と樹脂薄膜との接触状態が吸音効果に大きな影響
を与える。そのため、このような平坦加工を施したもの
を使用することにより両者の接触面積が向上して、より
良好な吸音特性を得ることができる。In the membrane vibration-absorbing material used in the present invention,
The state of contact between the plate and the resin thin film greatly affects the sound absorbing effect. Therefore, by using such a flattened one, the contact area between them can be improved, and better sound absorbing characteristics can be obtained.
【００２３】板状体の厚さには特に限定はなく、要求さ
れる機械的強度、膜振動吸音体の使用サイズ等に応じて
適宜決定すればよいが、吸音特性、取り扱性、加工性、
重量等を考慮すれば、通常０．２ｍｍ〜２ｍｍ程度、好
ましくは０．４ｍｍ〜１ｍｍである。The thickness of the plate-shaped body is not particularly limited, and may be appropriately determined according to the required mechanical strength, the used size of the membrane vibration absorber, and the like. ,
Considering the weight and the like, it is usually about 0.2 mm to 2 mm, preferably 0.4 mm to 1 mm.
【００２４】一方、膜振動吸音材に用いられる樹脂薄膜
２４としては、塩化ビニル系薄膜、ポリエチレン系薄
膜、ポリプロピレン系薄膜、弗化エチレン系薄膜、ポリ
弗化ビニリデン系薄膜、アクリル系薄膜等、公知の各種
の樹脂薄膜がいずれも適用可能であるが、吸音特性、耐
候性、耐久性等の点で、弗化エチレン系薄膜、ポリ弗化
ビニリデン系薄膜が特に好適に適用される。On the other hand, examples of the resin thin film 24 used for the film vibration-absorbing material include known thin films such as a vinyl chloride thin film, a polyethylene thin film, a polypropylene thin film, an ethylene fluoride thin film, a polyvinylidene fluoride thin film, and an acrylic thin film. Although any of the various resin thin films described above can be applied, an ethylene fluoride thin film and a polyvinylidene fluoride thin film are particularly preferably applied in terms of sound absorption characteristics, weather resistance, durability and the like.
【００２５】弗化エチレン系薄膜に用いられる弗化エチ
レン系の樹脂としては、公知の各種のものが例示される
が、４弗化エチレン（PTFE）、４弗化エチレン・ポリエ
チレン共重合体（ETFE）、３弗化エチレン（PCTFE）等
が好適に例示される。これらの弗化エチレン系樹脂は、
準不燃性で、かつ耐薬品性、耐候性、耐熱性に優れたも
のである。ポリビニリデン系薄膜として用いられるポリ
ビニリデン系の樹脂としては、公知の各種のものが例示
されるが、２弗化ビニリデン（PVDF）、弗化ビニリデン
・サイアナイド等が好適に例示される。これらのビニリ
デン系樹脂は耐薬品性および耐候性に優れたものであ
る。As the ethylene-based resin used for the ethylene-based thin film, various known resins can be exemplified, and tetrafluoroethylene (PTFE), a tetrafluoroethylene-polyethylene copolymer (ETFE) ), And ethylene trifluoride (PCTFE). These fluorinated ethylene resins are
It is semi-flammable and has excellent chemical resistance, weather resistance and heat resistance. As the polyvinylidene-based resin used as the polyvinylidene-based thin film, various known resins are exemplified, and vinylidene difluoride (PVDF), vinylidene fluoride and cyanide are preferably exemplified. These vinylidene resins are excellent in chemical resistance and weather resistance.
【００２６】このような樹脂薄膜２４の厚さには特に限
定はないが、好適な膜振動を得、良好な吸音特性を実現
するためには４μｍ〜２５μｍ、好ましくは５μｍ〜１
５μｍとするのがよい。The thickness of the resin thin film 24 is not particularly limited, but is preferably 4 μm to 25 μm, and more preferably 5 μm to 1 μm in order to obtain a suitable film vibration and realize good sound absorbing characteristics.
The thickness is preferably 5 μm.
【００２７】さて、本発明の吸音構造体の吸音機構につ
いて図３および図４を用いて説明する。まず、膜振動吸
音材の吸音機構に関しては既に、前記特開平１０−２２
２１７０号公報の中で本発明者等が詳述している。すな
わち、図3（ａ）に示されるように、樹脂薄膜２４に音
波Gが入射すると、樹脂薄膜面に当たる音波（振動する
空気粒子）の作用によって樹脂薄膜２４が振動する。す
なわち、音のエネルギーが樹脂薄膜２４の振動に変換さ
れ吸音作用が発現する（以下、吸音作用ａとする）。The sound absorbing mechanism of the sound absorbing structure of the present invention will be described with reference to FIGS. First, the sound absorbing mechanism of the membrane vibration absorbing material has already been described in Japanese Patent Application Laid-Open No. 10-22 / 1998.
No. 2170 discloses details thereof by the present inventors. That is, as shown in FIG. 3A, when a sound wave G is incident on the resin thin film 24, the resin thin film 24 vibrates due to the action of sound waves (vibrating air particles) hitting the resin thin film surface. That is, the sound energy is converted into the vibration of the resin thin film 24 and a sound absorbing effect is exhibited (hereinafter, referred to as a sound absorbing effect a).
【００２８】また、樹脂薄膜２４に入射した音波Gは、
樹脂薄膜２４表面に沿って流れるが、この音波の流れの
粘性作用（流れに対する抵抗力）によって音のエネルギ
ーが減衰されて吸音作用を発現する（以下、吸音作用ｂ
とする）。The sound wave G incident on the resin thin film 24 is
Although the sound flows along the surface of the resin thin film 24, sound energy is attenuated by viscous action (resistance to the flow) of the flow of the sound wave, thereby exhibiting a sound absorbing action (hereinafter, sound absorbing action b).
And).
【００２９】しかも、前記吸音作用ａのように樹脂薄膜
２４が振動すると、樹脂薄膜に接触する板状体２２によ
って振動が吸収され、結果的に音のエネルギーを吸収す
ると共に、前記吸音作用ａの発現を増大する（以下、吸
音作用ｃとする）。Further, when the resin thin film 24 vibrates as in the sound absorbing action a, the vibration is absorbed by the plate-like body 22 which comes into contact with the resin thin film, and as a result, the sound energy is absorbed and the sound absorbing action a is reduced. Increase expression (hereinafter referred to as sound absorbing effect c).
【００３０】図４（ａ）は上部が開放された筐体４１の
中に、一定の空気層４２を介して膜振動吸音材４３を配
設した吸音構造体の吸音機構の概念図を示す。吸音は主
に前記膜振動吸音材４３の吸音機構で詳述したように、
樹脂薄膜２４の振動に基づく膜振動吸音が主体である
が、これまでの実験データに基づくと、一定の空気層を
介した場合には、この空気層がバネとして働き、これに
基づく吸音作用の寄与もあるものと推察される。この空
気層のバネ作用が加わった膜振動吸音を膜振動吸音作用
（α1）４４とする。FIG. 4A is a conceptual diagram of a sound absorbing mechanism of a sound absorbing structure in which a membrane vibration absorbing material 43 is disposed via a fixed air layer 42 in a housing 41 having an open top. As described in detail in the sound absorbing mechanism of the membrane vibration absorbing material 43,
The film vibration absorption based on the vibration of the resin thin film 24 is mainly performed. However, based on the experimental data so far, when a certain air layer is interposed, the air layer acts as a spring, and the sound absorbing action based on this acts. It is assumed that there is also a contribution. The vibration-absorbing sound of the air layer to which the spring effect is applied is referred to as a vibration-absorbing sound effect (α1) 44.
【００３１】図４（ｄ）のカーブａに膜振動吸音材４３
の吸音特性の概念図を示す。一般的に中周波数帯域で良
好な吸音率を示し、低周波数帯域および高周波数帯域に
向かうに従って吸音率は低下する。The curve a in FIG.
FIG. 2 shows a conceptual diagram of the sound absorbing characteristics of FIG. In general, a good sound absorption coefficient is shown in the middle frequency band, and the sound absorption coefficient decreases toward the low frequency band and the high frequency band.
【００３２】なお本発明においては、低周波数帯域とは
３００Ｈｚ以下の周波数帯域であり、中周波数帯域とは
３００Ｈｚ以上で２０００Ｈｚ以下の周波数帯域を、ま
た高周波数帯域とは２０００Ｈｚ以上の周波数帯域を定
義する。In the present invention, the low frequency band is a frequency band of 300 Hz or less, the middle frequency band is a frequency band of 300 Hz to 2000 Hz, and the high frequency band is a frequency band of 2000 Hz or more. I do.
【００３３】図４（ｂ）は、筐体４１の中に、軟質繊維
系多孔質吸音材または連続気泡型弾性ホーム吸音材４６
を充填した場合の吸音機構の概念図を示す。吸音は、振
動する空気粒子が細孔内を通過する際の摩擦・粘性抵抗
（γ）４７によりなされ、図４（ｄ）のカーブｂに示す
ように、吸音率は低周波数帯域では低く、中高周波数帯
域では良好である。FIG. 4B shows a case 41 in which a soft fiber porous sound absorbing material or an open-cell type elastic home sound absorbing material 46 is provided in a housing 41.
FIG. 3 shows a conceptual diagram of a sound absorbing mechanism when the gas is filled. The sound absorption is performed by the friction and viscous resistance (γ) 47 when the oscillating air particles pass through the pores. As shown by curve b in FIG. 4D, the sound absorption coefficient is low in the low frequency band, Good in the frequency band.
【００３４】図４（ｃ）は、筐体４１の中に、軟質繊維
系多孔質吸音材または連続気泡型弾性ホーム吸音材４６
を充填し、その上に膜振動吸音材４３を配設した本発明
の吸音構造体の吸音機構概念図を示す。FIG. 4C shows a housing 41 in which a soft fiber-based porous sound absorbing material or an open-cell elastic home sound absorbing material 46 is provided.
FIG. 2 is a conceptual diagram of a sound absorbing mechanism of the sound absorbing structure of the present invention in which a film vibration absorbing member 43 is disposed thereon.
【００３５】本発明の吸音は、主に、膜振動吸音材４３
の膜振動吸音作用と、軟質繊維系多孔質吸音材または連
続気泡型弾性ホーム吸音材４６による、摩擦・粘性抵抗
による吸音（γ）４７、さらに軟質繊維系多孔質吸音材
または連続気泡型弾性ホーム吸音材４６の充填層の上に
配設された膜振動吸音材４３の全体が、前記充填層のバ
ネの働きを受けて振動することにより惹起される吸音作
用によりなされるものと推察される。この充填層のバネ
作用が加わった膜振動吸音作用を膜振動吸音作用（α
２）４８とする。The sound absorption of the present invention is mainly based on the film vibration sound absorbing material 43.
Sound absorption (γ) 47 due to friction and viscous resistance due to the film vibration and sound absorbing effect of a soft fiber-based porous sound absorbing material or open-cell elastic home sound absorbing material 46, and the soft fiber-based porous sound absorbing material or open-cell elastic home It is presumed that the whole of the membrane vibration-absorbing material 43 disposed on the filling layer of the sound absorbing material 46 is caused by the sound absorbing action caused by vibrating under the action of the spring of the filling layer. The membrane vibration sound absorbing effect to which the spring effect of the filling layer is added is referred to as the film vibration sound absorbing effect (α
2) Assume 48.
【００３６】ここで、前記空気層４２がバネとして働く
膜振動吸音作用（α1）４４と区別したのは、（α1）４
４が中周波数帯域の吸音に寄与する吸音作用であること
に対して、膜振動吸音作用（α２）４８が３００Ｈｚ以
下の特に、１００Ｈｚ、１２５Ｈｚの低周波数帯域に対
しても寄与する吸音作用と推察されるからである。図４
（ｄ）のカーブｃに示すように、本発明の吸音率は中高
周波数帯域のみならず、低周波数帯域でも良好な吸音率
を示す。Here, what distinguishes the air layer 42 from the membrane vibration absorbing function (α1) 44 acting as a spring is (α1) 4
4 is a sound absorbing effect that contributes to sound absorption in the middle frequency band, whereas the film vibration sound absorbing effect (α2) 48 is considered to be a sound absorbing effect that also contributes to a low frequency band of 100 Hz and 125 Hz below 300 Hz. Because it is done. FIG.
As shown by the curve c in (d), the sound absorption coefficient of the present invention shows a good sound absorption coefficient not only in the middle and high frequency bands but also in the low frequency band.
【００３７】図４（ａ）の膜振動吸音材４３のみの吸音
特性（カーブａ）に比べて高周波数帯域の吸音率の向上
は、前記したように軟質繊維系多孔質吸音材または連続
気泡型弾性ホーム吸音材４６の寄与に基づくものである
ことは明白である。また、低周波数帯域における吸音率
の改善は、膜振動吸音材４３が軟質繊維系多孔質吸音材
または連続気泡型弾性ホーム吸音材４６の上に配設され
た場合の、バネの働きを受けて振動することにより惹起
される吸音作用に基づくものと推察される。As compared with the sound absorbing characteristic (curve a) of only the membrane vibration sound absorbing material 43 of FIG. 4A, the improvement of the sound absorbing coefficient in the high frequency band is achieved by the soft fiber type porous sound absorbing material or the open cell type as described above. Obviously, it is based on the contribution of the elastic home sound absorbing material 46. The improvement of the sound absorption coefficient in the low frequency band is achieved by the action of the spring when the membrane vibration sound absorbing material 43 is disposed on the soft fiber porous sound absorbing material or the open-cell elastic home sound absorbing material 46. It is presumed to be based on the sound absorbing action caused by the vibration.
【００３８】すなわち、膜振動吸音材４３が前記軟質繊
維系多孔質吸音材または連続気泡型弾性ホーム吸音材４
６の充填層の影響を受ながら、低周波数帯域で共振する
ような現象を惹起し、これが低周波数帯域の音波を吸音
しているものと推察される。That is, the membrane vibration sound absorbing material 43 is made of the soft fiber porous sound absorbing material or the open-cell elastic home sound absorbing material 4.
Under the influence of the filling layer of No. 6, a phenomenon of causing resonance in a low frequency band is caused, and it is presumed that this phenomenon absorbs sound waves in the low frequency band.
【００３９】さて、本発明の請求項３に記述したよう
に、樹脂薄膜のかわりに金属製薄膜を用いてもよい。前
記金属製薄膜としてアルミニウム製の薄膜（以下、アル
ミ箔とする。）を用いた場合、その厚さには特に限定は
ないが、好適な膜振動を得、良好な吸音特性を実現する
ためには６μｍ〜２５μｍ、好ましくは６μｍ〜１５μ
ｍとするのがよい。但し、６μｍになると、強度が極端
に弱くなり破損し易いので取り扱いに細心の注意を要す
る。Now, as described in claim 3 of the present invention, a metal thin film may be used instead of the resin thin film. When an aluminum thin film (hereinafter, referred to as an aluminum foil) is used as the metal thin film, the thickness thereof is not particularly limited. However, in order to obtain a suitable film vibration and realize good sound absorbing characteristics. Is 6 μm to 25 μm, preferably 6 μm to 15 μm
m. However, when the thickness is 6 μm, the strength becomes extremely weak and the material is easily broken, so that careful handling is required.
【００４０】さて、本発明の実施例に用いた板状体は、
全て５ｍｍ×１０ｍｍの網目のアルミニウム製エキスパ
ンドメタル、および４ｍｍ×８ｍｍのアルミニウム製エ
キスパンドメタルにローラー加工を施して凹凸をならす
ことにより、表面を平坦化した。Now, the plate used in the embodiment of the present invention is as follows.
The surface was flattened by applying roller processing to the aluminum expanded metal mesh of 5 mm × 10 mm and the aluminum expanded metal of 4 mm × 8 mm to smooth out irregularities.
【００４１】この２種類のアルミニウム製エキスパンド
メタルで、厚さ１２μｍの透明なPTEF（ポリテトラフル
オロエチレン）製の薄膜を挟持し、さらに、５ｍｍ×１
０ｍｍ網目のアルミニウム製エキスパンドメタルの表面
を覆うように同様のPTFE薄膜を積層し、図2（ｃ）に示
される層構成の板状積層体（膜振動吸音材）を製作し
た。この膜振動吸音材を用いて下記６種類の吸音構造体
（パネル）を製作し、残響室法吸音率を測定し、比較検
討した。A transparent thin film made of PTEF (polytetrafluoroethylene) having a thickness of 12 μm is sandwiched between these two types of expanded metal made of aluminum.
A similar PTFE thin film was laminated so as to cover the surface of the expanded metal made of aluminum having a mesh of 0 mm, thereby producing a plate-shaped laminate (membrane vibration-absorbing material) having a layer configuration shown in FIG. 2 (c). The following six types of sound-absorbing structures (panels) were manufactured using the film vibration-absorbing material, and the reverberation room method sound absorption coefficient was measured and compared.
【００４２】また、薄膜としてアルミ箔を用いた場合
は、前記２種類のアルミニウム製エキスパンドメタル
で、厚さ１５μｍのアルミ箔を挟持し、図2（ｂ）に示
される層構成の膜振動吸音材を製作した。この膜振動吸
音材を用いて３種類の吸音構造体（パネル）を製作し、
当社残響室にて残響室法吸音率を測定し、比較検討し
た。When an aluminum foil is used as the thin film, a 15 μm-thick aluminum foil is sandwiched between the two types of expanded metal made of aluminum, and a film vibration-absorbing material having a layer structure shown in FIG. Was made. Three types of sound-absorbing structures (panels) were manufactured using this membrane vibration-absorbing material,
The reverberation room method sound absorption coefficient was measured in our reverberation room and compared.
【００４３】[実施例1]図５（ａ）に示すように、2００
０ｍｍ（長さ）×１０００ｍｍ（幅）×150ｍｍ（深
さ）で、上面のみが開放する筐体５1を製作した。な
お、この筐体の底面は厚さが1ｍｍの鋼鈑製遮音板５２
で、側壁５３は厚さ１ｍｍの鋼板を用いて箱状に加工し
てなる、幅２５ｍｍ（すなわち、これが側壁の厚さ）の
板材を組み合わせたものである。[Embodiment 1] As shown in FIG.
A housing 51 having a size of 0 mm (length) × 1000 mm (width) × 150 mm (depth) and having only the upper surface open was manufactured. The bottom of this housing is a 1 mm thick steel sound insulation plate 52.
The side wall 53 is a combination of a plate material having a width of 25 mm (that is, the thickness of the side wall) which is formed into a box shape using a steel plate having a thickness of 1 mm.
【００４４】図５（ｂ）に前記筐体５１の中に、厚さ１
５０ｍｍの連続気泡型弾性フォーム吸音材５４を充填
し、その上に膜振動吸音材５５を取り付けた本発明の吸
音構造体５６の、短辺方向横断面図を示す。FIG. 5B shows the case 51 having a thickness of 1 mm.
FIG. 7 shows a cross-sectional view in the short side direction of a sound absorbing structure 56 of the present invention in which a 50 mm open-cell elastic foam sound absorbing material 54 is filled and a membrane vibration sound absorbing material 55 is mounted thereon.
【００４５】また、図５（ｃ）に、比較例1として、厚
さ１５０ｍｍの連続気泡型弾性フォーム吸音材５４の上
に、厚さ１２μｍの樹脂薄膜５７のみを上乗せした吸音
構造体５８の短辺方向横断面図を示す。FIG. 5C shows, as Comparative Example 1, a short sound-absorbing structure 58 in which only a 12 μm-thick resin thin film 57 is added on a 150-mm-thick open-cell elastic foam sound-absorbing material 54. FIG.
【００４６】さらに、図５（ｄ）に、同じく比較例2と
して、厚さ１５０ｍｍの連続気泡型弾性フォーム吸音材
５４のみを充填した吸音構造体５９の短辺方向横断面図
を示す。FIG. 5D is a cross-sectional view in the short side direction of a sound absorbing structure 59 filled with only a 150-mm-thick open-cell elastic foam sound absorbing material 54 as Comparative Example 2 similarly.
【００４７】これら３種類の吸音構造体５６、５８、５
９について、ＪＩＳ Ａ１４０９−１９６７に準じて残
響室法吸音率を測定した結果を表1に示す。The three types of sound absorbing structures 56, 58, 5
Table 1 shows the results of measuring the reverberation chamber method sound absorption coefficient according to JIS A1409-1967 for No. 9.
【００４８】表１から明らかなように、本発明の実施例
１は、比較例１、２と比べて１００Hz、１２５Hz、１６
０Hzの低周波数帯域において優れた吸音率を示すことが
明らかである。その他の周波数域に関しては、比較例と
比べて若干の吸音率減少が見られるものの、極めて高い
吸音率であり実用上の問題はない。As is evident from Table 1, Example 1 of the present invention was 100 Hz, 125 Hz, 16 Hz in comparison with Comparative Examples 1 and 2.
It is clear that it shows excellent sound absorption in the low frequency band of 0 Hz. In other frequency ranges, although the sound absorption coefficient is slightly reduced as compared with the comparative example, the sound absorption coefficient is extremely high and there is no practical problem.
【００４９】[実施例２]図６（ａ）に示すように、前記
実施例１と同様の2０００ｍｍ（長さ）×１０００ｍｍ
（幅）×150ｍｍ（深さ）で、上面のみが開放する筐体
５1を製作した。図６（ｂ）に、前記筐体５１中の底の
部分に厚さ５０ｍｍの連続気泡型弾性フォーム吸音材６
４を充填し、その上に５０ｍｍの空気層７０を確保して
さらにその上に厚さ５０ｍｍの連続気泡型弾性フォーム
吸音材６４を充填、この上に膜振動吸音材５５を取り付
けて本発明の吸音構造体６６構成した、短辺方向横断面
図を示す。[Embodiment 2] As shown in FIG. 6A, the same 2,000 mm (length) × 1000 mm as in Embodiment 1 was used.
A housing 51 (width) × 150 mm (depth), with only the upper surface open, was manufactured. FIG. 6B shows a 50-mm-thick open-cell type elastic foam sound-absorbing material 6 on the bottom of the housing 51.
4, a 50 mm air layer 70 is secured thereon, and a 50 mm-thick open-cell elastic foam sound absorbing material 64 is further filled thereon, and a membrane vibration sound absorbing material 55 is mounted thereon. FIG. 3 shows a short-side direction cross-sectional view of the sound absorbing structure 66. FIG.
【００５０】また、図６（ｃ）に、比較例３として、厚
さ５０ｍｍの上面側連続気泡型弾性フォーム吸音材６４
の上に、厚さ１２μｍの樹脂薄膜６７のみを上乗せした
ものの、吸音構造体６８の短辺方向横断面図を示す。FIG. 6C shows, as Comparative Example 3, a 50 mm thick upper surface side open-cell type elastic foam sound absorbing material 64.
A cross-sectional view in the short side direction of the sound absorbing structure 68 is shown, in which only the resin thin film 67 having a thickness of 12 μm is added.
【００５１】さらに、図６（ｄ）に、比較例４として、
厚さ５０ｍｍの連続気泡型弾性フォーム吸音材６４と空
気層のみで構成した、吸音構造体６９の短辺方向横断面
図を示す。FIG. 6D shows Comparative Example 4 as
FIG. 3 is a cross-sectional view in the short side direction of a sound-absorbing structure 69 composed of only a 50-mm-thick open-cell elastic foam sound-absorbing material 64 and an air layer.
【００５２】これら３種類の吸音構造体６６、６８、６
９について、ＪＩＳ Ａ１４０９−１９６７に準じて残
響室法吸音率を測定した結果を表２に示す。The three types of sound absorbing structures 66, 68, 6
Table 9 shows the results of measuring the reverberation chamber method sound absorption coefficient of No. 9 according to JIS A1409-1967.
【００５３】表２から明らかなように、本発明に実施例
2は、比較例３、４と比べて１００Hz、１２５Hz、１６
０Hz、２００Hzの低周波数域において優れた吸音率を示
すことが明らかである。その他の周波数帯域に関して
は、比較例と比べて若干の吸音率減少が見られるもの
の、極めて高い吸音率であり実用上の問題はない。As is apparent from Table 2, the present invention is not limited to the embodiment.
2 is 100 Hz, 125 Hz, 16 compared to Comparative Examples 3 and 4.
It is evident that it exhibits excellent sound absorption in the low frequency range of 0 Hz and 200 Hz. In other frequency bands, although the sound absorption coefficient is slightly reduced as compared with the comparative example, the sound absorption coefficient is extremely high and there is no practical problem.
【００５４】[実施例３]図7（ａ）に示すように、前記
実施例１および２と同様の2０００ｍｍ（長さ）×１０
００ｍｍ（幅）×150ｍｍ（深さ）で、上面のみが開放
する筐体５1を製作した。図7（ｃ）に、前記筐体５１の
中に、厚さ１５０ｍｍの連続気泡型弾性フォーム吸音材
５４を充填し、その上に図７（ｂ）に示す構成のアルミ
箔８０を用いた膜振動吸音材７５を取り付けた、本発明
の吸音構造体７７の短辺方向横断面図を示す。本実施例
の膜振動吸音材７５の構成は、図７（ｂ）に示すよう
に、１５μｍのアルミ箔８０を２枚のアルミニウム製エ
キスパンドメタル板状体２２で挟持する構成とした。[Embodiment 3] As shown in FIG. 7 (a), the same 2,000 mm (length) .times.10
A housing 51 having a size of 00 mm (width) × 150 mm (depth) and having only the upper surface open was manufactured. FIG. 7C shows a film in which the housing 51 is filled with an open-cell elastic foam sound absorbing material 54 having a thickness of 150 mm, and an aluminum foil 80 having the structure shown in FIG. FIG. 7 shows a transverse cross-sectional view in the short side direction of a sound absorbing structure 77 of the present invention with a vibration sound absorbing material 75 attached. As shown in FIG. 7B, the configuration of the membrane vibration-absorbing material 75 of this embodiment is such that a 15-μm aluminum foil 80 is sandwiched between two aluminum expanded metal plate members 22.
【００５５】また、図７（ｄ）に、比較例５として、厚
さ１５０ｍｍの連続気泡型弾性フォーム吸音材５４の上
に、厚さ１５μｍのアルミ箔８０のみを上乗せした吸音
構造体７８の短辺方向横断面図を示す。FIG. 7D shows, as Comparative Example 5, a short sound-absorbing structure 78 in which only a 15 μm-thick aluminum foil 80 was placed on a 150-mm-thick open-cell elastic foam sound-absorbing material 54. FIG.
【００５６】さらに、図７（ｅ）に、比較例６として、
厚さ１５０ｍｍの連続気泡型弾性フォーム吸音材５４の
みを充填した、吸音構造体７９の短辺方向横断面図を示
す。FIG. 7E shows Comparative Example 6 as
FIG. 3 shows a transverse cross-sectional view in the short side direction of a sound absorbing structure 79 filled with only an open-cell elastic foam sound absorbing material 54 having a thickness of 150 mm.
【００５７】これら３種類の吸音構造体７７、７８、７
９について、ＪＩＳ Ａ１４０９−１９６７に準じて残
響室法吸音率を測定した結果を表３に示す。These three types of sound absorbing structures 77, 78, 7
Table 9 shows the results of measuring the reverberation chamber method sound absorption coefficient of Sample No. 9 according to JIS A1409-1967.
【００５８】表３から明らかなように、本発明の実施例
3は、比較例５，６と比べて１００Hz、１２５Hz、２０
０Ｈｚ、２５０Hzの低周波数域において優れた吸音率を
示すことが明らかである。その他の周波数域に関しては
他の比較例と比べて若干の吸音率減少が見られるもの
の、高い吸音率であり、実用上の問題はない。As is apparent from Table 3, examples of the present invention are shown.
3 is 100 Hz, 125 Hz, 20 compared to Comparative Examples 5 and 6.
It is evident that it exhibits excellent sound absorption in the low frequency range of 0 Hz and 250 Hz. In other frequency ranges, although the sound absorption coefficient is slightly reduced as compared with other comparative examples, the sound absorption coefficient is high and there is no practical problem.
【００５９】[0059]
【表１】 [Table 1]
【００６０】[0060]
【表２】 [Table 2]
【００６１】[0061]
【表３】 [Table 3]
【００６２】[0062]
【発明の効果】以上詳細に説明したように、本発明の吸
音構造体を用いることにより、中高周波数帯域の騒音の
みならず、３００Ｈｚ以下の低周波数帯域の騒音に関し
ても効果的に吸音が可能となる。これによって、大型機
械やボイラー、および変電所や発電所の変圧器等で発生
する低周波数帯域の騒音発生の低減が可能となる。As described in detail above, the use of the sound absorbing structure of the present invention makes it possible to effectively absorb not only noise in the middle and high frequency bands but also noise in the low frequency band of 300 Hz or less. Become. As a result, it is possible to reduce the generation of noise in a low frequency band generated in a large machine, a boiler, a transformer in a substation or a power plant, and the like.
【図１】従来技術の残響室法吸音率を示す図であり、
（ａ）はグラスウールの吸音率を、（ｂ）はあなあき珪
酸カルシウム板の吸音率を示す。FIG. 1 is a diagram showing a reverberation room method sound absorption coefficient of a conventional technique;
(A) shows the sound absorption of glass wool, and (b) shows the sound absorption of the perforated calcium silicate plate.
【図２】（ａ）， （ｂ）， （ｃ）および（ｄ）は、膜
振動吸音材の層構成を説明するための概念図である。FIGS. 2 (a), (b), (c) and (d) are conceptual diagrams for explaining a layer configuration of a membrane vibration-absorbing material.
【図３】（ａ）， （ｂ），および（ｃ）は、膜振動吸
音材の吸音作用を説明するための概念図である。FIGS. 3 (a), (b) and (c) are conceptual diagrams for explaining the sound absorbing effect of the membrane vibration absorbing material.
【図４】本発明の吸音機構を説明するための概念図であ
り、（ａ）は膜振動吸音材のみを用いた場合の、（ｂ）
は軟質繊維系多孔質吸音材または連続気泡型弾性フォー
ム吸音材を用いた場合の、（ｃ）は本発明の吸音機構を
説明する図である。また、（ｄ）は上記（ａ）、
（ｂ）、（ｃ）に対応する吸音特性を比較した概念図で
ある。4A and 4B are conceptual diagrams for explaining a sound absorbing mechanism of the present invention, wherein FIG. 4A shows a case where only a membrane vibration sound absorbing material is used, and FIG.
(C) is a diagram illustrating a sound absorbing mechanism of the present invention when a soft fiber-based porous sound absorbing material or an open-cell elastic foam sound absorbing material is used. (D) is the above (a),
It is a conceptual diagram which compared sound absorption characteristics corresponding to (b) and (c).
【図５】本発明の実施例1（ｂ）とその比較例1（ｃ）〜
２（ｄ）を説明するための図である。FIG. 5 shows Example 1 (b) of the present invention and Comparative Examples 1 (c) to
It is a figure for explaining 2 (d).
【図６】本発明の実施例２（ｂ）とその比較例３（ｃ）
〜４（ｄ）を説明するための図である。FIG. 6 shows Example 2 (b) of the present invention and Comparative Example 3 (c).
It is a figure for explaining-4 (d).
【図７】本発明の実施例３（（ｂ）および（ｃ））とそ
の比較例５（ｄ）〜６（ｅ）を説明するための図であ
る。FIG. 7 is a diagram for explaining Example 3 ((b) and (c)) of the present invention and Comparative Examples 5 (d) to 6 (e).
２２ （多数の開口を有する）板状体 ２４、５７、６７ 樹脂薄膜 ４０ 音波 ４１、５１ 筐体 ４２、７０ 空気層 ４３、５５、７５ 膜振動吸音材 ４４ 膜振動吸音作用（α1） ４６ 軟質繊維系多孔質吸音材または連続気泡型弾性フ
ォーム吸音材 ４７ 細孔内を振動する空気粒子が通過する際の摩擦・
粘性抵抗に基づく吸音作用（γ） ４８ 膜振動吸音作用（α２） ５２ 鋼鈑製遮音板 ５３ 鋼鈑製側壁 ５４、６４ 連続気泡型弾性フォーム吸音材 ５６、５８、５９、６６、６８、６９、７７、７８、７
９ 吸音構造体 ８０ アルミ箔22 Plate-like body (having many openings) 24, 57, 67 Resin thin film 40 Sound wave 41, 51 Housing 42, 70 Air layer 43, 55, 75 Membrane sound absorbing material 44 Membrane sound absorbing function (α1) 46 Soft fiber -Based porous sound-absorbing material or open-cell elastic foam sound-absorbing material 47 Friction when air particles vibrating in pores pass
Sound absorbing action based on viscous resistance (γ) 48 Membrane vibration sound absorbing action (α2) 52 Steel plate sound insulation plate 53 Steel plate side wall 54, 64 Open cell elastic foam sound absorbing material 56, 58, 59, 66, 68, 69, 77, 78, 7
9 Sound absorbing structure 80 Aluminum foil
───────────────────────────────────────────────────── フロントページの続き (72)発明者 井原 貫示 東京都大田区城南島２丁目２番２号株式会 社ユニックス内 Ｆターム(参考） 4F100 AB01B AB03 AB10 AB33B AK01B AR00B AR00D BA04 BA10B BA10D DB17 DC11A DC11C DG01C DJ03C GB08 JH01 JH01C JH01D JK07C JK13C JM02B 5D061 AA06 AA22 AA25 BB02 BB21 BB24 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kanji Ihara 2-2-2 Jonanjima, Ota-ku, Tokyo F-term in Reference to 4x100 AB01B AB03 AB10 AB33B AK01B AR00B AR00D BA04 BA10B BA10D DB17 DC11A DC11C DG01C DJ03C GB08 JH01 JH01C JH01D JK07C JK13C JM02B 5D061 AA06 AA22 AA25 BB02 BB21 BB24
Claims (3)
体と少なくも一枚の薄膜とを積層してなる膜振動吸音材
を音源側に配設、この膜振動吸音材の背後に軟質繊維系
多孔質吸音材もしくは連続気泡型弾性フォーム吸音材を
配設、さらに反音源側に遮音板を配設して構成され、振
動する空気粒子による膜振動に基づく吸音作用と、振動
する空気粒子が細孔内を通過する摩擦抵抗に基づく吸音
作用、および、前記軟質繊維系多孔質吸音材もしくは連
続気泡型弾性フォーム吸音材がバネとして作用すること
により膜振動吸音材に及ぼす吸音作用の相乗効果によ
り、周波数4００Hz以上の中高周波数帯域のみならず、
１００Hzから３００Hzの低周波数帯域の吸音を目的とす
ることを特徴とする、吸音構造体。1. A sound-absorbing material made of a laminate of at least one plate having a large number of openings and at least one thin film is provided on the sound source side, and a soft material is provided behind the film-vibrating sound absorbing material. A fiber-type porous sound absorbing material or open-cell elastic foam sound absorbing material is provided, and a sound insulating plate is further provided on the anti-sound source side. Absorption effect based on frictional resistance through which pores pass through pores, and synergistic effect of sound absorption effect on membrane vibration sound absorption material by the soft fiber porous sound absorption material or open-cell elastic foam sound absorption material acting as a spring By this, not only the middle and high frequency band of frequency 400Hz or more,
A sound-absorbing structure characterized by the purpose of absorbing sound in a low frequency band of 100 Hz to 300 Hz.
を特徴とする、吸音構造体。2. The sound absorbing structure according to claim 1, wherein the thin film is a resin thin film.
を特徴とする、吸音構造体。3. The sound absorbing structure according to claim 1, wherein the thin film is a metal thin film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11049766A JP2000250561A (en) | 1999-02-26 | 1999-02-26 | Sound absorbing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11049766A JP2000250561A (en) | 1999-02-26 | 1999-02-26 | Sound absorbing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000250561A true JP2000250561A (en) | 2000-09-14 |
Family
ID=12840308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11049766A Pending JP2000250561A (en) | 1999-02-26 | 1999-02-26 | Sound absorbing structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000250561A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002123259A (en) * | 2000-10-13 | 2002-04-26 | Nippon Sheet Glass Environment Amenity Co Ltd | Acoustical panel |
| JP2003122370A (en) * | 2001-10-11 | 2003-04-25 | Showa Electric Wire & Cable Co Ltd | Acoustic material |
| JP2006153926A (en) * | 2004-11-25 | 2006-06-15 | Bridgestone Kbg Co Ltd | Compound sound absorbing structure body |
| JP2006195006A (en) * | 2005-01-11 | 2006-07-27 | Toyota Motor Corp | Sound absorbing device |
| JP2006208949A (en) * | 2005-01-31 | 2006-08-10 | Toyota Motor Corp | Sound absorbing device |
| JP2006323204A (en) * | 2005-05-19 | 2006-11-30 | Bridgestone Kbg Co Ltd | Double sound absorption structure |
| JP2007102028A (en) * | 2005-10-06 | 2007-04-19 | Bridgestone Kbg Co Ltd | Sound absorbing structure |
| JP2007133268A (en) * | 2005-11-11 | 2007-05-31 | Univ Waseda | Sound absorbing material for low frequency made of closed cell glass foam material |
| JP2007334285A (en) * | 2006-05-16 | 2007-12-27 | Hitachi Ltd | Sound absorbing structure and rail vehicle |
| JP2009149117A (en) * | 2007-12-18 | 2009-07-09 | Yamaha Corp | Sound absorbing structure for automobile ceiling, and its manufacturing method |
| CN112659689A (en) * | 2021-01-14 | 2021-04-16 | 武汉纺织大学 | Light and thin low-frequency sound absorption material and preparation method and application thereof |
-
1999
- 1999-02-26 JP JP11049766A patent/JP2000250561A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002123259A (en) * | 2000-10-13 | 2002-04-26 | Nippon Sheet Glass Environment Amenity Co Ltd | Acoustical panel |
| JP2003122370A (en) * | 2001-10-11 | 2003-04-25 | Showa Electric Wire & Cable Co Ltd | Acoustic material |
| JP2006153926A (en) * | 2004-11-25 | 2006-06-15 | Bridgestone Kbg Co Ltd | Compound sound absorbing structure body |
| JP2006195006A (en) * | 2005-01-11 | 2006-07-27 | Toyota Motor Corp | Sound absorbing device |
| JP2006208949A (en) * | 2005-01-31 | 2006-08-10 | Toyota Motor Corp | Sound absorbing device |
| JP2006323204A (en) * | 2005-05-19 | 2006-11-30 | Bridgestone Kbg Co Ltd | Double sound absorption structure |
| JP2007102028A (en) * | 2005-10-06 | 2007-04-19 | Bridgestone Kbg Co Ltd | Sound absorbing structure |
| JP2007133268A (en) * | 2005-11-11 | 2007-05-31 | Univ Waseda | Sound absorbing material for low frequency made of closed cell glass foam material |
| JP2007334285A (en) * | 2006-05-16 | 2007-12-27 | Hitachi Ltd | Sound absorbing structure and rail vehicle |
| JP2009149117A (en) * | 2007-12-18 | 2009-07-09 | Yamaha Corp | Sound absorbing structure for automobile ceiling, and its manufacturing method |
| CN112659689A (en) * | 2021-01-14 | 2021-04-16 | 武汉纺织大学 | Light and thin low-frequency sound absorption material and preparation method and application thereof |
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