JP2002215172A - Acoustic material an acoustic structure - Google Patents
Acoustic material an acoustic structureInfo
- Publication number
- JP2002215172A JP2002215172A JP2001014713A JP2001014713A JP2002215172A JP 2002215172 A JP2002215172 A JP 2002215172A JP 2001014713 A JP2001014713 A JP 2001014713A JP 2001014713 A JP2001014713 A JP 2001014713A JP 2002215172 A JP2002215172 A JP 2002215172A
- Authority
- JP
- Japan
- Prior art keywords
- sound
- perforated plate
- porous material
- sound absorbing
- aluminum
- 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
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
- Bridges Or Land Bridges (AREA)
- Building Environments (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (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、騒音を発生する機
器や車輌の騒音対策、あるいは道路、鉄道などの防音壁
やトンネル、堀割等に用いる軽量で耐久性、強度に優れ
た吸音材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-weight sound-absorbing material having excellent durability and strength for use in noise-reducing devices and vehicles that generate noise, or for use in soundproof walls, tunnels, trenches, and the like of roads and railways.
【0002】[0002]
【従来の技術】従来、吸音材としてガラス繊維を板状に
加工したグラスウール吸音材やセラミック粒子を焼結し
たり、セメント系材料を発泡させた無機質系の多孔質吸
音材があるが、高速で走行する車両の外側に吸音処理を
施すために用いる場合、高速気流や振動などによって吸
音材が劣化損傷して性能が低下したり、破片が飛散する
問題があった。グラスウール吸音材は、高速気流によっ
て繊維が飛散して性能が低下しやすく、また、セラミッ
ク系の剛体吸音材は、割れやすく、更に、重いため車輌
などに取り付けた場合重量増となる問題があった。2. Description of the Related Art Conventionally, as a sound absorbing material, there are a glass wool sound absorbing material obtained by processing glass fiber into a plate shape, and an inorganic porous sound absorbing material obtained by sintering ceramic particles or foaming a cement material. When used to perform sound absorption processing on the outside of a running vehicle, there has been a problem that the sound absorbing material is deteriorated and damaged by high-speed airflow, vibration, or the like, resulting in reduced performance or scattered fragments. Glass wool sound-absorbing material has a problem that its performance is apt to be reduced due to scattering of fibers due to high-speed airflow, and ceramic-based rigid sound-absorbing material is liable to crack, and furthermore, because of its heavy weight, its weight increases when mounted on a vehicle or the like. .
【0003】これらの対策として、多孔質吸音材の表面
を孔明き板などで保護する方法があるが、吸音性能の低
下が起こらないようにするには孔明き板の開口率を30
%以上にする必要があり、開口率を大きくすると補強効
果が減少する問題があり、また、ガラス繊維や、セラミ
ックは孔明き板の孔部から繊維や破片が飛散する心配が
あった。As a countermeasure against these problems, there is a method of protecting the surface of the porous sound-absorbing material with a perforated plate or the like. However, in order to prevent the sound absorbing performance from lowering, the aperture ratio of the perforated plate must be reduced to 30%.
% Or more, and when the aperture ratio is increased, there is a problem that the reinforcing effect is reduced. In addition, glass fibers and ceramics have a fear that fibers and fragments are scattered from the holes of the perforated plate.
【0004】[0004]
【発明が解決しようとする課題】本発明は、上記の問題
点を解決するためになされたものであり、軽量、高強度
で、衝撃にも強く、吸音性能にも優れた、孔明き板を配
置した吸音材およびその吸音構造体を提供する。SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and a light-weight, high-strength, shock-resistant, and sound-absorbing perforated plate is provided. An arranged sound absorbing material and a sound absorbing structure thereof are provided.
【0005】[0005]
【課題を解決するための手段】上記の問題は、開口率が
30%以下の孔明き板の背後に、表裏に連通する多数の
細孔を有し、単位面積当たりの空気の流れ抵抗が100
N・S/m3以上の多孔質材を配設したことを特徴とす
る本発明の吸音材によって、解決することができる。そ
して、本発明は、前記孔明き板が金属製または樹脂製で
ある形態、あるいは、前記多孔質材が金属製である形
態、およびそれらを組合わせた形態に好ましく具体化で
きる。SUMMARY OF THE INVENTION The above problem is caused by the fact that behind a perforated plate having an aperture ratio of 30% or less, there are a large number of pores communicating on the front and back, and the air flow resistance per unit area is 100%.
The problem can be solved by the sound absorbing material of the present invention, wherein a porous material of N · S / m 3 or more is provided. The present invention can be preferably embodied in a form in which the perforated plate is made of metal or resin, a form in which the porous material is made of metal, and a form in which they are combined.
【0006】さらに、前記の問題は、前記(請求項1、
2または3)の吸音材の背後に多孔質材および/または
空気層を介して遮音性部材を設けたことを特徴とする本
発明の吸音構造体によって解決することができる。そし
て、この吸音構造体は、車両用として好適に用いられ
る。[0006] Further, the above-mentioned problem is caused by the above (claim 1,
This problem can be solved by the sound absorbing structure of the present invention, wherein a sound insulating member is provided behind the sound absorbing material of 2 or 3) via a porous material and / or an air layer. This sound absorbing structure is suitably used for vehicles.
【0007】[0007]
【発明の実施の形態】次に、本発明の吸音材および吸音
構造体に係る実施形態について、図1〜3を参照しなが
ら説明する。本発明の吸音材3の特徴とするところは、
開口率が30%以下の、例えば、アルミニウム、ステン
レス、鉄等の金属板に孔明け加工した孔明き板1の背後
に、表裏に連通する多数の細孔を有し、単位面積当たり
の空気の流れ抵抗が100N・S/m3以上の多孔質材
2、例えば、アルミニウム、アルミニウム合金、ステン
レス等の金属繊維の集合体を圧延成形などの方法で圧着
した多孔質材、金属繊維の集合体の両面または片面にエ
キスパンドメタル等の網材(図示せず)を添設して圧着
成形した多孔質材などを配設した点にある。Next, an embodiment of a sound absorbing material and a sound absorbing structure of the present invention will be described with reference to FIGS. The features of the sound absorbing material 3 of the present invention include:
A large number of pores communicating with the front and back are provided behind a perforated plate 1 having an opening ratio of 30% or less, for example, made of a metal plate of aluminum, stainless steel, iron, or the like. A porous material having a flow resistance of 100 N · S / m 3 or more, for example, a porous material obtained by pressing an aggregate of metal fibers such as aluminum, an aluminum alloy, and stainless steel by a method such as rolling molding, and an aggregate of metal fibers This is characterized in that a net material (not shown) such as expanded metal is attached to both surfaces or one surface, and a porous material formed by pressure bonding is provided.
【0008】ここで、本発明の構成部材である孔明き板
1について説明する。孔明き板1は、アルミニウム、ス
テンレス、鉄等の金属板に孔明け加工し孔11を設けた
ものや、プラスチック、FRP等の強化プラスチック、
硬質ゴムなどの樹脂を用いる。厚さは1〜2mm程度で
よいが、特に限定するものではない。Here, the perforated plate 1 which is a component of the present invention will be described. The perforated plate 1 is made of a metal plate made of aluminum, stainless steel, iron, or the like, and is provided with a hole 11 by punching, or a reinforced plastic such as plastic or FRP.
Use resin such as hard rubber. The thickness may be about 1-2 mm, but is not particularly limited.
【0009】また、その開口率は30%以下であること
が必要であり、より好ましくは25%以下である。ま
た、孔11の平面開口形状は丸形、三角形、四角形等、
また、孔11の断面形状はストレート孔、テーパー孔、
バーリング加工等用途に応じて選択すればよい。孔11
の大きさにも限定はないが、多孔質材を保護する目的か
ら孔径は2〜10mm程度が好ましい。The aperture ratio must be 30% or less, and more preferably 25% or less. In addition, the plane opening shape of the hole 11 is round, triangular, square, etc.
The cross-sectional shape of the hole 11 is a straight hole, a tapered hole,
What is necessary is just to select according to a use, such as burring. Hole 11
The size of the pore is not limited, but the pore diameter is preferably about 2 to 10 mm for the purpose of protecting the porous material.
【0010】次に、この孔明き板1の背後に配置する本
発明の構成部材である多孔質材2について説明する。こ
の多孔質材2は、表裏に連通する無数の細孔を有して吸
音性を備えた多孔質部材であって、空隙率は20〜50
%が好ましく、単位面積当たりの空気の流れ抵抗は10
0〜2000N・S/m3のものが用いられる。より好
ましくは、600〜1500N・S/m3のものがよ
い。その板厚は、5mm以下が適当である。Next, a description will be given of the porous material 2 which is a constituent member of the present invention disposed behind the perforated plate 1. The porous material 2 is a porous member having an infinite number of pores communicating with the front and back and having sound absorbing properties, and has a porosity of 20 to 50.
% Is preferable, and the air flow resistance per unit area is 10%.
Those having a value of 0 to 2000 N · S / m 3 are used. More preferably, it is 600 to 1500 N · S / m 3 . The plate thickness is suitably 5 mm or less.
【0011】多孔質材の材質は、金属質あるいは金属製
が好ましい。例えば、アルミニウム、アルミニウム合
金、ステンレス等の金属繊維の集合体を圧延成形などの
方法で圧着した多孔質材2、金属繊維の集合体の両面ま
たは片面にエキスパンドメタル等の網材(図示せず)を
添設して圧着成形した多孔質材、圧着後に接着剤などを
加えて固めるなどの方法で成形した多孔質材2、アルミ
ニウム、アルミニウム合金などの金属粒子を焼結した多
孔質材2、金属粒子を接着剤で固めた多孔質材2、ある
いはアルミニウムなどの金属を発泡させて連通孔を設け
た多孔質材2などが好ましく適用できる。The material of the porous material is preferably metallic or metallic. For example, a porous material 2 obtained by pressing an aggregate of metal fibers such as aluminum, an aluminum alloy, and stainless steel by a method such as rolling, and a net material (not shown) such as an expanded metal on both surfaces or one surface of the aggregate of metal fibers. , A porous material 2 formed by a method such as adding an adhesive or the like after pressing to harden, a porous material 2 obtained by sintering metal particles such as aluminum or an aluminum alloy, a metal A porous material 2 in which particles are hardened with an adhesive, or a porous material 2 in which a communication hole is provided by foaming a metal such as aluminum can be preferably used.
【0012】前記のうち、金属繊維を圧着した多孔質材
2の場合は、板厚を調節でき、例えば1mm程度に薄く
することが可能であり、また、金属繊維が複雑に絡み合
っているので、剥離や飛散が起こりにくいので、孔明き
板1の内部や背後に配置する材料として特に好ましい。Among the above, in the case of the porous material 2 in which metal fibers are pressed, the thickness can be adjusted, for example, it can be reduced to about 1 mm, and the metal fibers are complicatedly entangled. Since peeling and scattering are unlikely to occur, it is particularly preferable as a material disposed inside or behind the perforated plate 1.
【0013】なお、その他の多孔質材2としては、次の
材料を用いてもよい。 セラミック粒子の焼結、発泡体、およびセメント系材
料の発泡体。 セラミック繊維を接着剤により加工した板状体。 プラスチック粒子の熱圧着体、接着剤で接着加工した
板状体。 プラスチック繊維の熱圧着体、接着剤で接着加工した
板状体。As the other porous material 2, the following materials may be used. Sintering of ceramic particles, foams, and foams of cementitious materials. A plate-shaped body made of ceramic fibers processed with an adhesive. Thermo-compressed body of plastic particles, plate-shaped body bonded with adhesive. Thermocompression bonding of plastic fiber, plate-like body bonded with adhesive.
【0014】このような多孔質材2と孔明き板1との接
合構造としては、孔明き板1と多孔質材2とを単に重ね
合わせた非接着構造も採用されるが、それらを接着剤、
加熱などの方法で貼り合わせて面接着構造または面接合
構造とするのが好ましく、孔明き板1と多孔質材2を重
ねて圧延、加圧などの方法で圧着するのもよい。この場
合、熱や接着剤を併用してもよい。As such a joint structure between the porous material 2 and the perforated plate 1, a non-adhesive structure in which the perforated plate 1 and the porous material 2 are simply overlapped with each other is also adopted. ,
It is preferable to form a surface-bonded structure or a surface-bonded structure by laminating by a method such as heating. Alternatively, the perforated plate 1 and the porous material 2 may be stacked and pressed by a method such as rolling or pressing. In this case, heat or an adhesive may be used in combination.
【0015】また、多孔質材2を原料の状態で孔明き板
1に接触させて成形等の加工を行って、多孔質材2と孔
明き板1とを一体化した状態で形成するようにしてもよ
い。なお、孔明き板1と多孔質材2の接合性を良くする
ため、孔明き板1の孔部分にバーリング加工(図1
(3)参照)を施して折り曲げたバーリング部22を形
成したり、孔明き板の孔11部分に多孔質材をくい込ま
せて成形(図1(2)参照)してもよいし、前述の二方
法を併用してもよい。また、孔明き板は、多孔質材の片
面(表面)に配置しても、両面(表面、裏面)に配置す
るようにしてもよい。Further, the porous material 2 is brought into contact with the perforated plate 1 in the state of a raw material, and a process such as molding is performed to form the porous material 2 and the perforated plate 1 in an integrated state. You may. In order to improve the bondability between the perforated plate 1 and the porous material 2, a burring process (see FIG.
(See (3)) to form the bent burring portion 22, or a porous material may be inserted into the hole 11 of the perforated plate and formed (see FIG. 1 (2)) or may be formed as described above. Two methods may be used in combination. Further, the perforated plate may be arranged on one surface (front surface) of the porous material or on both surfaces (front surface, back surface).
【0016】次に、孔明き板1と多孔質材2との組み合
わせについて説明する。基本的には、孔明き板1、多孔
質材2とが1対1の組み合わせであるが、次の事例のよ
うに一方に対して他方を複数種、組み合わせて配置して
もよい。 孔明き板+多孔質材+孔明き板(図1(4)参照) 孔明き板+多孔質材A(流れ抵抗小)+多孔質材B
(流れ抵抗大)(図1(5)参照) 孔明き板+多孔質材C(金属製)+多孔質材D(ガラ
ス繊維製)(図1(5)参照)Next, the combination of the perforated plate 1 and the porous material 2 will be described. Basically, the perforated plate 1 and the porous material 2 are in a one-to-one combination. However, as shown in the following example, one perforated plate and the other porous material may be combined and arranged. Perforated plate + porous material + perforated plate (see Fig. 1 (4)) Perforated plate + porous material A (low flow resistance) + porous material B
(Large flow resistance) (See FIG. 1 (5)) Perforated plate + Porous material C (made of metal) + Porous material D (made of glass fiber) (See FIG. 1 (5))
【0017】かくして得られる吸音材3の吸音特性は、
多孔質材2の吸音特性によって調整することができる。
多孔質材2の吸音特性は、主に単位面積当たりの空気の
流れ抵抗(通気抵抗)、気孔率、気孔の大きさや形状に
よって決まるので、多孔質材2の材質の選択や製造条件
の選択よって調整できる。例えば、板厚が薄めの場合
は、空隙の大きさを小さくするなどして、また、板厚が
厚い場合は空隙の大きさを大きくして、単位面積当たり
の空気の流れ抵抗を所定の値に調整することによって、
必要な吸音特性に調整することができる。なお、強度や
耐衝撃性を高めるには、孔明き板1の板厚を厚く、孔径
を小さくするよう調整する。The sound absorbing properties of the sound absorbing material 3 thus obtained are as follows:
It can be adjusted by the sound absorption characteristics of the porous material 2.
The sound absorption characteristics of the porous material 2 are determined mainly by the air flow resistance (ventilation resistance) per unit area, the porosity, and the size and shape of the pores. Can be adjusted. For example, when the plate thickness is small, the size of the gap is reduced, and when the plate thickness is large, the size of the gap is increased, so that the air flow resistance per unit area is set to a predetermined value. By adjusting to
It can be adjusted to the required sound absorption characteristics. In order to increase the strength and the impact resistance, the thickness of the perforated plate 1 is adjusted to be large and the hole diameter is reduced.
【0018】次に、本発明の吸音構造体について、図3
を参照して説明する。この吸音構造体の構成は、基本的
には、図3(1)に示すように、音源側から、吸音材3
(例えば、孔明き板1+多孔質材2)+空気層4+遮音
性部材6であるが、吸音材と遮音性部材との間に、多孔
質材と空気層を複数層、次の事例にように、組み合わせ
て配置することができる。 吸音材3+多孔質材5+空気層4+遮音性部材6(図
3(2)参照) 吸音材3+空気層4+多孔質材5+空気層4+遮音性
部材6(図3(3)参照)Next, the sound absorbing structure of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The structure of this sound absorbing structure basically includes, as shown in FIG.
(For example, perforated plate 1 + porous material 2) + air layer 4 + sound insulating member 6, but between the sound absorbing material and the sound insulating member, a plurality of porous materials and air layers are provided. Can be arranged in combination. Sound absorbing material 3 + porous material 5 + air layer 4 + sound insulating member 6 (see FIG. 3 (2)) Sound absorbing material 3 + air layer 4 + porous material 5 + air layer 4 + sound insulating member 6 (see FIG. 3 (3))
【0019】この遮音性部材6としては、鉄、アルミニ
ウムなどの金属、プラスチックなどの樹脂板、コンクリ
ートなどの無機材料が、適当であり、多孔質材5は、前
記した材料が適宜採用できる。本発明の吸音材は、孔明
き板の背後に比較的薄肉の多孔質材を配置したものであ
り、更に、その背後に空気層を配置した吸音構造である
ため、孔明き板による共鳴吸音と多孔質材による音波を
熱エネルギーに変換して減衰させる作用の相乗効果があ
り、孔明き板の開口率が小さくても高い吸音特性が得ら
れるのである。このようにして得た、吸音構造体は、例
えば鉄道車輌の下面部や車輪廻りなどの吸音性構成材と
して、好ましく用いられる。この場合、車体自体を遮音
性部材として利用してもよい。As the sound insulating member 6, a metal such as iron or aluminum, a resin plate such as plastic, or an inorganic material such as concrete is suitable. As the porous material 5, the above-described materials can be appropriately used. The sound absorbing material of the present invention has a relatively thin porous material disposed behind a perforated plate, and further has a sound absorbing structure in which an air layer is disposed behind the perforated plate. There is a synergistic effect of the effect of converting sound waves by the porous material into heat energy and attenuating the sound energy, and high sound absorption characteristics can be obtained even if the aperture ratio of the perforated plate is small. The sound-absorbing structure thus obtained is preferably used as a sound-absorbing component such as a lower surface of a railway vehicle or around wheels. In this case, the vehicle body itself may be used as the sound insulating member.
【0020】[0020]
【実施例】次に、本発明の実施例を示す表1に基づい
て、さらに詳細に説明する。繊維径が約0.1mmのア
ルミニウム繊維の集合体を圧着成形した多孔質材
(A)、繊維径が約0.1mmのアルミニウム繊維の集
合体の両面に開口率が70〜80%のアルミニウム製の
エキスパンドメタルを配して圧着成形した多孔質材
(B)、繊維径が約0.1mmのアルミニウム繊維の集
合体の片面に開口率が70%のアルミニウム製のエキス
パンドメタルを配して圧着成形した多孔質材(C)、
(D)の片面に厚さが1mmのステンレス製の板に丸孔
を明けた孔明き板を貼り付け、実施例である試験体No
1〜No11の吸音材を得た。なお本発明の範囲外の条
件の試験体No12、孔明き板を配置しない構造の試験
体No13〜No15などを比較例として対比した。Next, the present invention will be described in more detail with reference to Table 1 showing examples of the present invention. A porous material (A) obtained by press-forming an aggregate of aluminum fibers having a fiber diameter of about 0.1 mm, and an aluminum material having an aperture ratio of 70 to 80% on both surfaces of an aggregate of aluminum fibers having a fiber diameter of about 0.1 mm. A porous material (B), which is formed by pressing and expanding an expanded metal, and an aluminum expanded metal having an opening ratio of 70% is disposed on one side of an aggregate of aluminum fibers having a fiber diameter of about 0.1 mm by pressure. Porous material (C),
(D) A stainless steel plate having a thickness of 1 mm was pasted on one side with a perforated plate having a circular hole, and the specimen No.
No. 1 to No. 11 sound absorbing materials were obtained. Specimens No. 12 under conditions outside the scope of the present invention, and Specimens Nos. 13 to 15 having a structure without a perforated plate were compared as comparative examples.
【0021】上記の実施例、比較例の吸音材について、
垂直入射吸音率の測定と衝撃試験を行った。垂直入射吸
音率については、吸音材の背後に空気層を設けたり多孔
質材を配置して測定し、その吸音特性の代表例を図4
に、そのピーク値を表1に示した。また、衝撃試験は、
50cm角の測定用吸音材を砂の上に置き、1mの高さ
から0.5kgの鋼球を落下させて材料の変形の有無を
調査した。With respect to the sound absorbing materials of the above Examples and Comparative Examples,
The measurement of the normal incidence sound absorption coefficient and the impact test were performed. The normal incidence sound absorption coefficient was measured by providing an air layer behind the sound absorbing material or arranging a porous material, and a typical example of the sound absorbing characteristics is shown in FIG.
Table 1 shows the peak values. In addition, the impact test
A 50 cm square sound absorbing material for measurement was placed on sand, and a 0.5 kg steel ball was dropped from a height of 1 m to check whether or not the material was deformed.
【0022】この実施例によれば、表1の試験結果に示
すとおり、本発明の吸音材および吸音構造体は、良好な
吸音率を有し、かつ衝撃性が格別に優れていることが分
る。本発明の吸音材及び吸音構造体は、以上の通り、表
面が開口率が30%以下の比較的小さい開口率の金属製
の孔明き板で保護されており、その背後に配置する多孔
質材も金属繊維の圧着集合体を用いたものであって、高
速気流や衝撃に対しても破損や飛散が起こりにくい構造
を備えており、適度な吸音率も得られるので車輌等の吸
音材として好適なものとなる。According to this example, as shown in the test results in Table 1, it can be seen that the sound-absorbing material and the sound-absorbing structure of the present invention have a good sound-absorbing coefficient and excellent impact properties. You. As described above, the sound-absorbing material and the sound-absorbing structure of the present invention have a surface protected by a metal perforated plate having a relatively small opening ratio of 30% or less, and a porous material disposed behind the plate. It also uses a crimped aggregate of metal fibers, has a structure that does not easily break or scatter even at high speed airflow and impact, and has an appropriate sound absorption coefficient, so it is suitable as a sound absorbing material for vehicles etc. It becomes something.
【0023】[0023]
【表1】 [Table 1]
【0024】[0024]
【発明の効果】本発明の孔明き板を配置した吸音材およ
び吸音構造体は、以上説明したように構成されているの
で、表面を孔明き板で補強されて強度や耐衝撃性に優
れ、薄板状で軽量であるため取り付けが容易であり、取
り付け後も重量増による問題が生じにくく、孔明き板で
補強したにもかかわらず高い吸音特性を有する。そし
て、高速で走行する車輌の下面部や車輪廻りなどの吸音
用、道路鉄道などの防音壁に用いる防音パネル用、道路
鉄道のトンネルや堀割部用などに特に有効な吸音材とし
て使用できるという優れた効果がある。よって本発明
は、従来の問題点を解消した孔明き板を配置した吸音材
および吸音構造体として、工業的価値はきわめて大なる
ものがある。The sound-absorbing material and the sound-absorbing structure provided with the perforated plate according to the present invention are constructed as described above, so that the surface is reinforced by the perforated plate and the strength and impact resistance are excellent. Since it is thin and lightweight, it is easy to install, and even after installation, problems due to weight increase are unlikely to occur, and it has high sound absorption characteristics despite being reinforced with a perforated plate. And it can be used as a sound absorbing material especially effective for sound absorbing panels such as undersides and around wheels of vehicles running at high speed, for soundproofing panels used for noise barriers of road railways, and for tunnels and trenches of road railways. Has an effect. Therefore, the present invention has extremely high industrial value as a sound absorbing material and a sound absorbing structure in which a perforated plate that solves the conventional problems is arranged.
【図1】本発明の吸音材を説明するための要部斜視図。FIG. 1 is a perspective view of a main part for describing a sound absorbing material of the present invention.
【図2】本発明の吸音材の構成部材の組み合わせ(1〜
5)を示す断面略図。FIG. 2 shows a combination (1 to 2) of components of the sound absorbing material of the present invention.
Sectional drawing which shows 5).
【図3】本発明の吸音構造体の構成部材の組み合わせ
(1〜3)を示す断面略図。FIG. 3 is a schematic cross-sectional view showing combinations (1 to 3) of constituent members of the sound absorbing structure of the present invention.
【図4】代表的な実施例の吸音特性を示すグラフ。FIG. 4 is a graph showing sound absorption characteristics of a typical example.
1 孔明き板、11 孔、2 多孔質材、22 バーリ
ング部、3 吸音材、4空気層、5 多孔質材、6 遮
音性部材。1 perforated plate, 11 holes, 2 porous materials, 22 burring part, 3 sound absorbing materials, 4 air layers, 5 porous materials, 6 sound insulating members.
フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) E04B 1/86 E01F 8/00 Fターム(参考) 2D001 AA01 CA01 CB02 CD02 CD03 CD04 2D059 GG02 GG25 2E001 DF04 FA03 FA30 GA18 GA33 GA42 HA04 HA07 HA14 HB02 HB03 HB04 HD11 HD12 HE01 JA22 JA28 JB01 JB07 JB08 LA04 3D023 BA02 BB00 BD00 BE01 BE31 5D061 AA16 AA25 BB02 DD07 Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (reference) E04B 1/86 E01F 8/00 F term (reference) 2D001 AA01 CA01 CB02 CD02 CD03 CD04 2D059 GG02 GG25 2E001 DF04 FA03 FA30 GA18 GA33 GA42 HA04 HA07 HA14 HB02 HB03 HB04 HD11 HD12 HE01 JA22 JA28 JB01 JB07 JB08 LA04 3D023 BA02 BB00 BD00 BE01 BE31 5D061 AA16 AA25 BB02 DD07
Claims (5)
表裏に連通する多数の細孔を有し、単位面積当たりの空
気の流れ抵抗が100N・S/m3以上の多孔質材を配
設したことを特徴とする吸音材。(1) Behind a perforated plate having an aperture ratio of 30% or less,
A sound-absorbing material comprising a porous material having a large number of pores communicating on both sides thereof and having a flow resistance of air per unit area of 100 N · S / m 3 or more.
記載の吸音材。2. The sound absorbing material according to claim 1, wherein the perforated plate is made of metal or resin.
に記載の吸音材。3. The method according to claim 1, wherein the porous material is made of metal.
The sound-absorbing material described in 1.
の背後に多孔質材および/または空気層を介して遮音性
部材を設けたことを特徴とする吸音構造体。4. A sound-absorbing structure, characterized in that a sound-insulating member is provided behind the sound-absorbing material according to claim 1, 2 or 3 via a porous material and / or an air layer.
て、請求項1または2または3に記載の吸音材の背後に
多孔質材および/または空気層を介して遮音性部材を設
けた吸音構造体。5. A sound absorbing structure attached to a vehicle, wherein a sound insulating member is provided behind the sound absorbing material according to claim 1, 2 or 3 via a porous material and / or an air layer. Structure.
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---|---|---|---|
JP2001014713A JP2002215172A (en) | 2001-01-23 | 2001-01-23 | Acoustic material an acoustic structure |
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