JP5130255B2 - Sound absorbing plate - Google Patents
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- JP5130255B2 JP5130255B2 JP2009123738A JP2009123738A JP5130255B2 JP 5130255 B2 JP5130255 B2 JP 5130255B2 JP 2009123738 A JP2009123738 A JP 2009123738A JP 2009123738 A JP2009123738 A JP 2009123738A JP 5130255 B2 JP5130255 B2 JP 5130255B2
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本発明は、吸音板に関するものである。 The present invention relates to a sound absorbing plate.
鉄道軌道に近接した建物では、鉄道軌道からの騒音が影響するため、防音塀が設置されることがある。一般に、高架軌道では高欄が設置されているが、これに防音板を取り付けることにより、騒音の影響を低減する方法が取られる場合がある。 In buildings close to the railway track, noise proofing may be installed because the noise from the railway track affects. In general, a railing is installed on an elevated track, but a method of reducing the influence of noise may be taken by attaching a soundproof plate to the rail.
この場合、構造耐力上の制限から、重量のある付属物を新たに設置することができない既存鉄道高架軌道がある。 In this case, there are existing elevated railway tracks where heavy accessories cannot be installed due to structural strength limitations.
従来の吸音板としては、代表的な吸音材としてのグラスウールを取付用の枠や表面保護用のパンチングメタル等の補助板等で被覆して板体に構成したもの（例えば特許文献１参照）や、セラミック系、モルタル系材料を板体に成形してなる吸音板等がある。セラミック吸音板としては、多孔セラミック板の焼成品からなる吸音板（例えば特許文献２参照）が知られている。 As a conventional sound-absorbing plate, glass wool as a typical sound-absorbing material is covered with an auxiliary plate such as a mounting frame or a punching metal for surface protection, etc. to form a plate (see, for example, Patent Document 1) And a sound absorbing plate formed by molding a ceramic or mortar material into a plate. As a ceramic sound absorbing plate, a sound absorbing plate made of a fired product of a porous ceramic plate (for example, see Patent Document 2) is known.
吸音材としてのグラスウールは、それ自体は比較的軽いのであるが、材料が軟らかいため、これを板体に構成する場合には上記パンチングメタル等の補助板で全体を被覆する必要があり、吸音板全体としては重量が大きくなってしまう。 Glass wool as a sound-absorbing material itself is relatively light, but since the material is soft, it is necessary to cover the whole with an auxiliary plate such as the above-mentioned punching metal when constituting it into a plate body. Overall, the weight increases.
また補助板等で被覆せずに、そのまま下地材にボルト、ナット等で取り付けることができるセラミック系やモルタル系の吸音板は、重量が非常に大きい。 Ceramic and mortar sound absorbing plates that can be directly attached to the base material with bolts, nuts and the like without being covered with an auxiliary plate or the like are very heavy.
上記特許文献２記載の吸音板は吸音率は高いものの、重くて脆くという難点がある。
Although the sound absorbing plate described in
従って、上述の従来の吸音板はいずれも、構造耐力上の制限から、重量のある付属物を設置することができない既存鉄道高架軌道には採用するのは困難である。 Therefore, any of the above-described conventional sound absorbing plates is difficult to adopt for existing railway elevated tracks where heavy accessories cannot be installed due to structural strength limitations.
そこで、本発明は、このような従来の課題を解決して、軽量で、吸音性能の高い吸音板を提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve such a conventional problem and to provide a sound absorbing plate that is lightweight and has high sound absorbing performance.
上述した課題を解決するために、本発明は、素材板体に一面側から他面側に多数の穴を形成して、多数の閉管気柱部を構成し、閉管気柱部を構成する各穴の長さを異ならしめた吸音板であって、同板の嵩比重が０．４以下であり、多数の穴は板体の拡がり方向に対し斜め方向に形成されると共に音源側に開口し、吸音板と各穴の反音源側を塞ぐ反射用板体床との間に吸音材が介設され、板体の少なくとも前記一面部に相当する前面部と側面部が保護板で被覆され、保護板は、損失正接（ｔａｎδ）のピーク値１．５以上の有機高分子材料からなる制振シートと、制振シートの外側に設けられた縦弾性係数１ＧＰａ以上の拘束部材とからなり、保護板には板体の多数の穴に対応する貫通穴が形成されていることを特徴とする鉄道軌道用の吸音板を提供する。 In order to solve the above-described problems, the present invention forms a large number of holes from one side to the other side of a material plate body, constitutes a large number of closed tube air columns, and constitutes a closed tube air column. a sound absorbing plate made different lengths of the holes, the bulk density of the plate is 0.4 or less, a large number of holes opened in Rutotomoni source side is formed in an oblique direction with respect to the spread direction of the plate body The sound absorbing material is interposed between the sound absorbing plate and the reflection plate floor covering the opposite sound source side of each hole, and at least the front surface portion and the side surface portion corresponding to the one surface portion of the plate body are covered with a protective plate, protective plate is composed loss and damping sheet comprising a peak value of 1.5 or more organic polymeric materials tangent (tan [delta), and the modulus of longitudinal elasticity 1GPa or more restraining members disposed on the outer side of the vibration-damping sheet, sound absorbing plate for a railway track in the protective plate, wherein the through-holes corresponding to the number of holes in the plate body is formed To provide.
本発明では、閉管気柱部の共鳴により吸音を図るので、閉管気柱部を構成する穴の長さすなわち深さを調節することにより、吸音対象の周波数帯域を設定することができる。また、多数の閉管気柱部を構成する各穴の長さ（深さ）を異ならしめることで、吸音対象の周波数帯域を複数設定することができる。多数の閉管気柱部を構成する穴の長さ（深さ）が均一であると、特定の周波数の音に対してしか吸音効果が生じない。例えば、騒音レベルのピークが５００〜２０００Ｈｚといった広い範囲において平坦な特性を示す場合には、特定周波数のみではオールパス騒音レベルへの効果は小さい。それよりは騒音特性に対応する幅広い周波数での吸音率を示す吸音板の方が効果的である。 In the present invention, since sound absorption is achieved by resonance of the closed tube air column part, the frequency band of the sound absorption target can be set by adjusting the length, that is, the depth of the hole constituting the closed tube air column part. Further, by making the lengths (depths) of the holes constituting the many closed air column portions different, it is possible to set a plurality of frequency bands to be absorbed. If the lengths (depths) of the holes constituting a large number of closed-pipe air column portions are uniform, a sound absorbing effect is produced only for sound of a specific frequency. For example, when the peak of the noise level shows a flat characteristic in a wide range of 500 to 2000 Hz, the effect on the all-pass noise level is small only with a specific frequency. Rather, a sound-absorbing plate that exhibits a sound absorption coefficient in a wide range of frequencies corresponding to noise characteristics is more effective.
さらに、本発明の吸音板では、その嵩比重は０．４以下であるので、軽量であり、既存の高架橋、鉄橋等に取付ける際に構造物への負担が小さくて済み、補強が必要でなく、寿命の短縮を招くことがない。より好ましくは嵩比重は０．２以下、さらに好ましくは０．１以下である。 Furthermore, in the sound-absorbing plate of the present invention, the bulk specific gravity is 0.4 or less, so it is lightweight, and it is possible to reduce the burden on the structure when it is attached to an existing viaduct or steel bridge, and no reinforcement is required. , Without shortening the service life. More preferably, the bulk specific gravity is 0.2 or less, and further preferably 0.1 or less.
吸音板の材質は、好ましくは紙、アルミニウム、プラスチックである。プラスチック材料は、発泡スチロール、発泡ポリウレタン、発泡ポリプロピレン、発泡ポリエチレン等の各種の発泡高分子樹脂素材である。材料の形態は中実体のほか、発泡体であってもよい。嵩比重０．１以下の吸音材が望まれる場合は、発泡体が好ましいが、吸音率に関係する穴の密度、すなわち開口率に限界があるため、重量的に許容される範囲で中実体の方が好ましい。 The material of the sound absorbing plate is preferably paper, aluminum, or plastic. Plastic materials are various foamed polymer resin materials such as foamed polystyrene, foamed polyurethane, foamed polypropylene, and foamed polyethylene. The material may be solid or foam. When a sound-absorbing material having a bulk specific gravity of 0.1 or less is desired, a foam is preferable. Is preferred.
本発明では、多数の穴を板体の拡がり方向に対して直角方向に形成する場合と比較して、穴の長さ、従って閉管気柱部を構成する穴の長さを長くすることが可能であり、従って板体を厚くせずに、より低い周波数帯域に適合させることができる。 In the present invention, it is possible to increase the length of the hole, and hence the length of the hole constituting the closed air column, as compared with the case where a large number of holes are formed in a direction perpendicular to the expanding direction of the plate body. Therefore, it is possible to adapt to a lower frequency band without increasing the thickness of the plate.
本発明では、吸音板と各穴の反音源側を塞ぐ反射用板体床との間に吸音材が介設されるので、吸音効果を一層高めることができる。吸音材としては繊維状物、連続気泡の発泡体等が好ましい。 In the present invention, since the sound absorbing material is interposed between the sound absorbing plate and the reflecting plate floor covering the opposite sound source side of each hole , the sound absorbing effect can be further enhanced. As the sound absorbing material, a fibrous material, an open cell foam or the like is preferable.
耐火性や耐候性、対擦過性を必要とする用途では、板体を保護板で被覆しても良い。この場合も、被覆は、板体の全体を被覆する必要はなく、少なくとも前面部と側面部を被覆すれば良いので、全体を被覆しなければならないグラスウールを吸音材とする場合よりも軽量に構成することができる。 In applications that require fire resistance, weather resistance, and scratch resistance, the plate may be covered with a protective plate. In this case as well, it is not necessary to cover the entire plate body, and it is sufficient to cover at least the front surface and the side surface. can do.
本発明による吸音板は、既存の防音壁にこれを設置する使用形態の外、吸音板自体を防音壁として用いることもできる。例えば、耐火性や耐候性、対擦過性を必要とする用途では、新設もしくは既存の防音壁を撤去して新たに本発明による吸音板を防音壁として設置する場合は、板体の前面部と側面部の外に後面部も保護板で被覆する。板体の後面部の被覆は、板体の前面部の被覆と同様に行ってもよいし、比較的薄い金属板もしくはフレキシブルボードなど、前面部および側面部の保護板材料とは異なる材料を用いて行ってもよい。 The sound-absorbing plate according to the present invention can be used as a sound-insulating wall, in addition to a usage pattern in which the sound-absorbing plate is installed on an existing sound-insulating wall. For example, in applications that require fire resistance, weather resistance, and scratch resistance, when installing a new sound absorbing plate as a sound insulating wall after removing a new or existing sound insulating wall, The rear part is also covered with a protective plate outside the side part. The rear surface portion of the plate body may be coated in the same manner as the front surface portion of the plate body, or a material different from the protective plate material of the front and side portions, such as a relatively thin metal plate or flexible board, is used. You may go.
板体を保護板で被覆すると、板体と保護板が列車の通過時に振動により互いに衝突して新たな音源になることがある。これを防ぐために、これら両者を強固に接合する必要がある。また、樹脂発泡体では約５００〜２０００Ｈｚの範囲で共鳴現象が発生して防音性能が著しく低下する。そこで、保護板としては、損失正接（ｔａｎδ）のピーク値１．５以上の有機高分子材料からなる制振シートと、制振シートの外側に設けられた縦弾性係数１ＧＰａ以上の拘束部材とからなるものを用いると、板体と保護板を強固に接合することができる上に、その優れた制振性能により防音性能の低下を防ぐことができる。制振シートと拘束部材からなる保護板を板体の穴開口面側すなわち前面部に設ける場合は、板体の穴に対応する位置で保護板にも連通部すなわち貫通穴を開ける。制振シートは、１００Ｈｚで計測した損失正接（ｔａｎδ）のピーク値が１．５以上である有機高分子材料からなるものであれば、特に限定されないが、極性基を有する高分子材料が好ましい。このような高分子材料の例として、クロロプレンゴム、アクリロニトリル−ブタジエンゴム、フッ素系ゴム、エチレン−酢酸ビニル共重合体、ポリビニルブチラール、クロロスルフォン化ポリエチレン、塩素化ポリエチレン、塩化ビニル系樹脂、塩素化塩化ビニル系樹脂、塩化ビニリデン系樹脂、塩化ビニル−塩化ビニリデン共重合体、ハロゲン化ポリマー、フッ素系ポリマー、臭素系ポリマー、ポリウレタン系熱可塑性エラストマー、ポリエステル系熱可塑性エラストマー、ポリアミド系熱可塑性エラストマーなどが挙げられる。拘束部材としては耐火性や耐候性、対擦過性の点から金属製であることが好ましい。 When the plate body is covered with a protective plate, the plate body and the protective plate may collide with each other due to vibration when the train passes and become a new sound source. In order to prevent this, it is necessary to firmly bond both of them. In addition, in the resin foam, a resonance phenomenon occurs in the range of about 500 to 2000 Hz, and the soundproof performance is significantly lowered. Therefore, as the protective plate, loss and damping sheet comprising a peak value of 1.5 or more organic polymeric materials tangent (tan [delta), and the modulus of longitudinal elasticity 1GPa or more restraining members disposed on the outer side of the vibration damping sheet When the plate is used, it is possible to firmly bond the plate body and the protective plate, and it is possible to prevent the soundproof performance from being lowered by the excellent vibration damping performance. Damping If sheet and a protective plate made of restraining member into the hole opening surface side or leading surface portion of the plate member, also protective plate at a position corresponding to the hole of the plate member Ru opened communicating portion or the through hole. Damping sheet, as long as the peak value of the loss tangent measured at 100 Hz (tan [delta) is made of an organic polymer material is 1.5 or more, but are not limited to, polymeric materials having polar groups are preferred . Examples of such polymer materials include chloroprene rubber, acrylonitrile-butadiene rubber, fluorine rubber, ethylene-vinyl acetate copolymer, polyvinyl butyral, chlorosulfonated polyethylene, chlorinated polyethylene, vinyl chloride resin, chlorinated chloride. Examples include vinyl resins, vinylidene chloride resins, vinyl chloride-vinylidene chloride copolymers, halogenated polymers, fluorine polymers, bromine polymers, polyurethane thermoplastic elastomers, polyester thermoplastic elastomers, and polyamide thermoplastic elastomers. It is done. The restraining member is preferably made of metal from the viewpoint of fire resistance, weather resistance, and scratch resistance.
本発明は、以上に説明したとおり、軽量で、吸音性能の高い吸音板を提供することができるので、以下に示すような効果が奏される。 As described above, the present invention can provide a sound-absorbing plate that is lightweight and has high sound-absorbing performance, and therefore has the following effects.
ａ．構造耐力上の制限から重量のある付属物を設置することができない既存鉄道高架軌道の高欄に、鉄道騒音の近隣への影響を低減するための吸音板を設置することができる。 a. A sound-absorbing plate for reducing the influence of railway noise on the vicinity can be installed on the rail of an existing railway elevated track where heavy accessories cannot be installed due to structural strength limitations.
ｂ．このような軽量の吸音板は、普及率の高い発泡スチロール製の板体をはじめとして、発泡ポリウレタン、発泡ポリプロピレン、発泡ポリエチレン等の各種の発泡高分子樹脂素材の板体の表面に多数の穴を形成するという、非常に簡易な吸音構造であり、非常に安価に構成することができると共に、穴の深さや、異なった深さの穴を組み合わせる等により吸音周波数特性を簡易に制御することができる。 b. Such lightweight sound-absorbing plates form a large number of holes on the surface of various foamed polymer resin materials such as foamed polyurethane, foamed polypropylene, and foamed polyethylene, as well as plates made of expanded polystyrene. This is a very simple sound absorbing structure that can be configured at a very low cost, and the sound absorption frequency characteristics can be easily controlled by combining holes with different depths or holes.
ｃ．軽量であることから、高欄等への取り付け作業を容易に行うことができる。 c. Since it is lightweight, it can be easily attached to a railing or the like.
ｄ．制振シートと拘束部材とからなる保護板で板材の少なくとも前面部と側面部を被覆することにより、板体と保護板を強固に接合することができる上に、その優れた制振性能により防音性能の低下を防ぐことができる。 d. By covering at least the front surface portion and side portions of the plate with a protective plate made of a vibration damping sheet and the restraining member, on which can be firmly joined to the plate member and the protective plate, soundproof by its excellent damping performance Performance degradation can be prevented.
次に本発明の実施の形態を図を参照して説明する。なお、実施例１〜５は本発明を部分的に説明するために参考例として挙げたものである。 Next, embodiments of the present invention will be described with reference to the drawings. Examples 1 to 5 are given as reference examples in order to partially explain the present invention.
実施例１
図１は吸音板の平面図、図２はその一部の拡大図、図３は図２中のIII−IIIに沿う断面図である。
Example 1
1 is a plan view of the sound absorbing plate, FIG. 2 is an enlarged view of a part thereof, and FIG. 3 is a sectional view taken along line III-III in FIG.
各図において、符号(1) は本発明により構成した吸音板を示すものであり、吸音板(1) は、例えば発泡スチロール、発泡ポリウレタン、発泡ポリプロピレン、発泡ポリエチレン等の各種の発泡高分子樹脂素材から成る板体(2) の一面側から他面側に向かって多数の穴(3) を形成し、多数の穴(3) を多数の閉管気柱部として構成している。吸音板の嵩比重は０．０２５である。 In each figure, reference numeral (1) denotes a sound absorbing plate constructed according to the present invention, and the sound absorbing plate (1) is made of various foamed polymer resin materials such as foamed polystyrene, foamed polyurethane, foamed polypropylene, and foamed polyethylene. A large number of holes (3) are formed from one surface side of the plate body (2) to the other surface side, and the large number of holes (3) are configured as a large number of closed tube air column portions. The bulk density of the sound absorbing plate is 0.025.
多数の穴(3) は縦横に整列して形成されているが、千鳥状に配置したり、ランダムに配置したり、適宜に配置することができる。 A large number of holes (3) are formed so as to be aligned vertically and horizontally, but they can be arranged in a staggered manner, randomly, or appropriately.
吸音板(1) は、発泡スチロール製の板体(2) によって構成しているので、パンチングメタル等の補助板等で被覆せずに、その形状を維特することができる。従って、ボルト、ナット等の適宜の取り付け部材により、そのまま吸音を行う個所における下地材に設置することができ、非常に軽量である。 Since the sound-absorbing plate (1) is composed of a foamed polystyrene plate (2), its shape can be maintained without being covered with an auxiliary plate such as punching metal. Therefore, it can be installed on the base material at the place where sound is absorbed as it is by using appropriate attachment members such as bolts and nuts, and is very lightweight.
閉管気柱部の長さ、即ち穴(3) の長さ（深さ）は、図３に示すように、異ならしめられている。これにより、穴(3) による閉管気柱部の共鳴が生じ、吸音対象の周波数帯域を設定することができる。 The lengths of the closed air column, that is, the lengths (depths) of the holes (3) are made different as shown in FIG. Thereby, resonance of the closed tube air column portion by the hole (3) occurs, and the frequency band of the sound absorption target can be set.
実施例２
１枚の板体に上記２０ｍｍ、３６ｍｍ、４０ｍｍの穴が等面積、即ち、板体の全面積の１／３ずつ形成されている。その他の構成は実施例１のものと同じである。この吸音板（嵩比重：０．０２５）について、吸音率の測定を行った。この結果を図４に示す。
Example 2
The holes of 20 mm, 36 mm, and 40 mm are formed in one plate body at equal areas, that is, 1/3 of the total area of the plate body. Other configurations are the same as those of the first embodiment. The sound absorption rate was measured for this sound absorbing plate (bulk specific gravity: 0.025). The result is shown in FIG.
比較例１〜３
穴径２．２ｍｍ、穴ピッチ５．５ｍｍで、穴深さが夫々２０ｍｍ（比較例１）、３０ｍｍ（比較例２）、４０ｍｍ（比較例３）になるように夫々の板体に穴が形成されている。その他の構成は実施例１のものと同じである。これらの吸音板（嵩比重：０．０２５）について、吸音率の測定を行った。この結果も図４に示す。
Comparative Examples 1-3
Holes are formed in each plate so that the hole diameter is 2.2 mm, the hole pitch is 5.5 mm, and the hole depth is 20 mm (Comparative Example 1), 30 mm (Comparative Example 2), and 40 mm (Comparative Example 3), respectively. Has been. Other configurations are the same as those of the first embodiment. The sound absorption coefficient was measured for these sound absorbing plates (bulk specific gravity: 0.025). This result is also shown in FIG.
図４によれば、板体の全てに夫々２０ｍｍ、３０ｍｍ、４０ｍｍの深さの穴を形成した吸音板（比較例１〜３）は、夫々特定の周波数帯域で顕著なピークを持つ吸音特性を有することが分かる。 According to FIG. 4, the sound absorbing plates (Comparative Examples 1 to 3) in which holes having a depth of 20 mm, 30 mm, and 40 mm are formed in all of the plates, respectively, have a sound absorbing characteristic having a remarkable peak in a specific frequency band. It turns out that it has.
これに対して、一枚の板体に２０ｍｍ、３０ｍｍ、４０ｍｍの穴を等面積で形成した吸音板（実施例２）では、他の吸音板と比較して吸音率のピークの高さが低くなり、即ち吸音率が低下している。すなわち、他の３枚の吸音板では、夫々の特定の周波数帯域を外れた周波数帯域において吸音率が大きく低下しているのに対して、この吸音板では、他の夫々の吸音板の吸音率のピークの周液数帯域を包括する周波数帯域においても吸音率が高い傾向を示している。 On the other hand, in the sound absorbing plate (Example 2) in which holes of 20 mm, 30 mm, and 40 mm are formed in a single plate body with an equal area, the peak of the sound absorption coefficient is lower than other sound absorbing plates. That is, the sound absorption rate is lowered. That is, in the other three sound absorbing plates, the sound absorption rate is greatly reduced in the frequency band outside the specific frequency band, whereas in this sound absorbing plate, the sound absorption rate of each of the other sound absorbing plates. The sound absorption coefficient tends to be high even in the frequency band including the peripheral liquid number band of the peak.
従って、一枚の板体に構成する多数の閉管気柱部の長さ、即ち穴の深さを群毎に異ならせれば、吸音対象の周波数帯域を複数設定して、広い周波数帯域に渡って吸音を行うことができることがわかる。 Therefore, if the length of a large number of closed tube air column parts constituting one plate body, that is, the depth of the hole is made different for each group, a plurality of frequency bands for sound absorption are set, and a wide frequency band is set. It can be seen that sound absorption can be performed.
実施例３
図５に示すように、長さを異にする多数の貫通穴(3) を有する吸音板（材質：厚さ５ｍｍの段ボール、板サイズ：４００ｍｍ×７００ｍｍ、吸音板厚：最大１４０ｍｍ〜最小６０ｍｍ、重ね枚数：８０枚、穴径：４ｍｍ、開口率：７０％、、目付：８００ｇ／ｍ２）(1) １０枚を残音室（容積２００ｍ２）の床上に壁から１．５ｍ離して、各傾斜面(8) が上に来るように、敷設した。この構造で、音源として１個のスピーカーを３．５ｍの間隔で残音室内の壁付近に設置し、３個のマイクを吸音板から１．５ｍ、壁および床からそれぞれ１．５ｍ、かつ音源（ピンクノイズ）から２．５ｍ離れた位置で残音室内に設置し、吸音率を測定した（温度２０℃、相対湿度５０％）。この測定結果を図６のグラフに示す。
Example 3
As shown in FIG. 5, a sound-absorbing plate having a number of through-holes (3) of different lengths (material: corrugated cardboard with a thickness of 5 mm, plate size: 400 mm × 700 mm, sound-absorbing plate thickness: maximum 140 mm to minimum 60 mm, Number of stacked sheets: 80 sheets, hole diameter: 4 mm, aperture ratio: 70%, basis weight: 800 g / m 2 ) (1) Separate 10 sheets on the floor of the residual sound chamber (volume 200 m 2 ) from the wall by 1.5 m, It was laid so that each inclined surface (8) was on top. With this structure, one speaker as a sound source is installed near the wall in the residual sound room at an interval of 3.5 m, three microphones are 1.5 m from the sound absorbing plate, 1.5 m from the wall and the floor, and the sound source It was installed in the residual sound chamber at a position 2.5 m away from (pink noise), and the sound absorption coefficient was measured (temperature 20 ° C., relative humidity 50%). The measurement results are shown in the graph of FIG.
実施例４
図７に示すように、図５に示す実施例３の吸音板(1) において、吸音板(1) と反射用板体床(9) の間に吸音材（密度１３ｋｇ／ｃｍ３ 、厚さ９０ｍｍのポリエステル繊維製シート）(10)を介設させた。その他の点は実施例３の操作と同様に行い、吸音率を測定した。この測定結果を図８のグラフに示す。
Example 4
As shown in FIG. 7, in the sound absorbing plate (1) of Example 3 shown in FIG. 5, a sound absorbing material (density 13 kg / cm 3 , thickness between the sound absorbing plate (1) and the reflecting plate floor (9). A 90 mm polyester fiber sheet) (10) was interposed. Other points were performed in the same manner as in Example 3, and the sound absorption rate was measured. The measurement results are shown in the graph of FIG.
実施例５
図９において、長さ（深さ）を異にする多数の穴(3) が板体(2) に斜め方向に形成されている。その他の構成は実施例１のものと同じである。
Example 5
In FIG. 9, a large number of holes (3) having different lengths (depths) are formed in the plate body (2) in an oblique direction. Other configurations are the same as those of the first embodiment.
１ 吸音板
２ 板体
３ 穴（閉管気柱部）
８ 傾斜面
９ 反射用板体床
１０ 吸音材
1
8
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| AT522999A1 (en) * | 2019-10-01 | 2021-04-15 | Delta Bloc Int Gmbh | SOUND ABSORBER |
| KR102275352B1 (en) * | 2019-10-31 | 2021-07-12 | 전북대학교산학협력단 | Rotor noise reduction cover |
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| JP2546269Y2 (en) * | 1995-09-18 | 1997-08-27 | 株式会社ノザワ | Resonator type soundproof panel |
| JPH09328833A (en) * | 1996-06-07 | 1997-12-22 | Isolite Kogyo Kk | Ceramic sound absorbing material |
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