JP2006017787A - Underwater sound absorbing device - Google Patents

Underwater sound absorbing device Download PDF

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JP2006017787A
JP2006017787A JP2004192754A JP2004192754A JP2006017787A JP 2006017787 A JP2006017787 A JP 2006017787A JP 2004192754 A JP2004192754 A JP 2004192754A JP 2004192754 A JP2004192754 A JP 2004192754A JP 2006017787 A JP2006017787 A JP 2006017787A
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sound absorbing
sound
water
wedge
absorbing material
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JP4551139B2 (en
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Kazuhiro Yoshizumi
和洋 吉住
Satoshi Tazaki
智 田崎
Fumiyasu Hidaka
文泰 日高
Shigenori Imatake
滋典 今竹
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Mitsubishi Heavy Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an underwater sound absorbing device which is small in size and low in cost, is equipped with a sound-absorbing structure having high sound absorption effects with respect to sounds in a wide range frequency region from a low-frequency sound to a high-frequency sound, and is especially suitable for an anechoic water tank (a sound-absorbing water tank). <P>SOLUTION: In the underwater sound absorbing device, in which a sound-absorbing structure is provided facing under water to absorb sounds propagated through the under water by the sound absorbing structure, the sound-absorbing structure is constituted so that acoustical materials of a plurality of layers made of porous materials different in absorption frequency region are supported inside a support body made of hard material such as concrete, thereby absorbing sounds by making the sound propagated through the under water to be made incident on the structure from the inner surface of the material of the inner layer facing the under water of the acoustical materials of the plurality of layers and allowing the sound to pass through the inside of other acoustical materials. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、音響が問題になる船舶や海洋構造物等の水中音響試験用の無響水槽（吸音水槽）や、水中に設置する吸音壁に適用され、音を吸収する吸音構造体を水中に臨んで設け、該吸音構造体により水中を伝播される音を吸収するように構成された水中吸音装置に関する。   The present invention is applied to an anechoic water tank (sound absorbing water tank) for underwater acoustic tests such as ships and marine structures where sound is a problem, and a sound absorbing wall installed in water, and a sound absorbing structure that absorbs sound is submerged in water. The present invention relates to an underwater sound absorbing device that is provided to face and is configured to absorb sound propagated through water by the sound absorbing structure.

無響水槽（吸音水槽）は、吸音率が十分に高い吸音構造体で各内面部を構成し、該吸音構造体により形成された内部空間で測定空間内と測定周波数範囲で自由音場を形成できるもので、水中における種々の吸音実験に用いられている。
図１５ないし図１６は、かかる無響水槽における吸音構造体の２つの例を示す要部縦断面図である。 An anechoic water tank (sound absorbing water tank) is composed of a sound absorbing structure with a sufficiently high sound absorption coefficient, and each inner surface portion is formed by the internal space formed by the sound absorbing structure to form a free sound field in the measurement space and in the measurement frequency range. It can be used for various sound absorption experiments in water.
FIG. 15 thru | or FIG. 16 is a principal part longitudinal cross-sectional view which shows two examples of the sound absorption structure in this anechoic water tank.

図１５に示される吸音構造体は、非特許文献１にて提供されているもので、図において、１０は木材からなる吸音構造体である。５１は該吸音構造体１０の内層材で、無響水槽の水室１０１に臨む内面５１ａを複数の楔状の歯５１ｃと溝５１ｄとが交互に連設された楔状凹凸面に形成し、該内層材５１の外面５１ｂをコンクリート製の支持体１の内面に固着している。
図１６に示される吸音構造体１０は、ゴム材を単層あるいは複数層積層してなる内層材６１の水室１０１に臨む内面６１ａを平面（あるいは図１５のような楔状凹凸面）に形成し、前記内層材６１の外面６１ｂをコンクリート製の支持体１の内面に固着している。 The sound absorbing structure shown in FIG. 15 is provided in Non-Patent Document 1. In the figure, 10 is a sound absorbing structure made of wood. 51 is an inner layer material of the sound absorbing structure 10, and an inner surface 51a facing the water chamber 101 of the anechoic water tank is formed on a wedge-shaped uneven surface in which a plurality of wedge-shaped teeth 51c and grooves 51d are alternately arranged. The outer surface 51 b of the material 51 is fixed to the inner surface of the concrete support 1.
In the sound absorbing structure 10 shown in FIG. 16, an inner surface 61a facing the water chamber 101 of the inner layer material 61 formed by laminating a single layer or a plurality of layers of rubber material is formed in a flat surface (or a wedge-shaped uneven surface as shown in FIG. 15). The outer surface 61b of the inner layer material 61 is fixed to the inner surface of the concrete support 1.

また、特許文献２には、水中に臨む複数の吸音シートの一面に溝を設け、この溝から各吸音シートの隙間に水を浸透させ、吸音シート間の隙間で生じる音の反射を低減させるようにして、前記吸音シートの隙間に積極的に水または固有音響インピーダンスが水に近い物質を導入する構造として、楔型吸音構造体と同程度の吸音性能を約半分の大きさの装置で実現可能とした水中吸音装置が開示されている。   Further, in Patent Document 2, a groove is provided on one surface of a plurality of sound absorbing sheets facing the water, and water is permeated into the gaps between the sound absorbing sheets from the grooves, so that reflection of sound generated in the gaps between the sound absorbing sheets is reduced. As a structure that actively introduces water or a substance with a specific acoustic impedance close to water into the gap between the sound absorbing sheets, it is possible to achieve a sound absorbing performance equivalent to that of a wedge type sound absorbing structure with a device about half the size. An underwater sound absorbing device is disclosed.

日本造船学会誌 第７３７号 （第２９頁ないし第３４頁）Journal of the Japan Institute of Shipbuilding No. 737 (Pages 29-34) 特開２０００−１４６７５０号公報JP 2000-146750 A

しかしながら、かかる従来技術は次のような問題点を有している。
即ち、図１５に示される吸音構造体にあっては、木材からなる内層材５１の水室１０１に臨む内面５１ａを楔状凹凸面とした構造であるため、周波数は１ＫＨｚ程度以上の高周波音に対しては該内層材５１の厚さをさほど大きくしなくても所要の吸音効果が得られるが、２００Ｈｚ程度の低周波音に対しては所要の吸音効果を得るには該内層材５１の厚さを大幅に増大する必要があり（２００Ｈｚの低周波音についた所要の吸音効果を得るにはを７．５ｍの厚さが必要）、吸音構造体１０が大型化し、無響水槽としては構造上成り立たなくなる。 However, this conventional technique has the following problems.
That is, in the sound absorbing structure shown in FIG. 15, since the inner surface 51a facing the water chamber 101 of the inner layer material 51 made of wood has a wedge-shaped uneven surface, the frequency is higher than about 1 KHz. Thus, the required sound absorbing effect can be obtained without increasing the thickness of the inner layer material 51. However, the thickness of the inner layer material 51 is required to obtain the required sound absorbing effect for low frequency sound of about 200 Hz. (In order to obtain the required sound absorption effect for low frequency sound of 200 Hz, a thickness of 7.5 m is required), the sound absorbing structure 10 is enlarged, and it is structurally suitable as an anechoic water tank. It doesn't hold true.

図１６に示される吸音構造体１０にあっては、広範囲の周波域の音に対して比較的高い吸音効果を有するが、吸音構造体１０にゴム材を用いているため該吸音構造体が高価となり、水中吸音装置の装置コストが高くなる。
また、特許文献２に開示されている水中吸音装置は、複数の吸音シートの隙間に溝を設けて吸音シート間の隙間で生じる音の反射を低減するにとどまり、該特許文献２には広範囲の周波域の吸音についての手段は示唆されていない。 The sound absorbing structure 10 shown in FIG. 16 has a relatively high sound absorbing effect for sounds in a wide frequency range. However, since the sound absorbing structure 10 uses a rubber material, the sound absorbing structure is expensive. Thus, the device cost of the underwater sound absorbing device is increased.
In addition, the underwater sound absorbing device disclosed in Patent Document 2 is provided with grooves in the gaps between a plurality of sound absorbing sheets to reduce the reflection of sound generated in the gaps between the sound absorbing sheets. No means for sound absorption in the frequency range is suggested.

本発明はかかる従来技術の課題に鑑み、小型かつ低コストの構造で以って、低周波音から高周波音まで広範囲の周波数域の音に対して高い吸音効果を有する吸音構造体をそなえて、殊に無響水槽（吸音水槽）に好適な水中吸音装置を提供することを目的とする。   In view of the problems of the prior art, the present invention has a sound absorbing structure having a high sound absorbing effect with respect to sound in a wide frequency range from low frequency sound to high frequency sound with a small and low-cost structure, In particular, an object of the present invention is to provide an underwater sound absorbing device suitable for an anechoic water tank (sound absorbing water tank).

本発明はかかる目的を達成するもので、音を吸収する吸音構造体を水中に臨んで設け、該吸音構造体により前記水中を伝播される音を吸収するように構成された水中吸音装置において、前記吸音構造体は、吸収周波数範囲が異なる多孔質材料からなる複数層の吸音材をコンクリート等の硬質材料からなる支持体の内側に支持されてなり、前記水中を伝播される音を前記複数層の吸音材のうちの前記水中に臨む内層材の内面から入射して他の吸音材内を通過せしめることにより吸音するように構成されてなることを特徴とする。
かかる発明において好ましくは、前記吸音構造体は、前記複数層の吸音材を表面を互いに接触させて積層し、外側に配置された吸音材の表面を前記支持体に接触させて固定してなる。 The present invention achieves such an object, a sound absorbing structure that absorbs sound is provided facing the water, and an underwater sound absorbing device configured to absorb sound propagated through the water by the sound absorbing structure, The sound absorbing structure is configured such that a plurality of layers of sound absorbing materials made of porous materials having different absorption frequency ranges are supported inside a support made of a hard material such as concrete, and the sound propagated through the water is The sound absorbing material is configured to absorb sound by entering from the inner surface of the inner layer material facing the water and passing through the other sound absorbing material.
Preferably, in this invention, the sound absorbing structure is formed by laminating the sound absorbing materials of the plurality of layers so that the surfaces thereof are in contact with each other, and fixing the surface of the sound absorbing material disposed on the outside in contact with the support.

かかる発明によれば、水中を伝播される音を、吸音構造体における吸収周波数範囲が異なる複数層の多孔質材料吸音材のうちの水中に臨む内層材を通過する際に、例えば高周波数の音を吸収し、次いでこの音が例えば該内層材よりも吸収周波数範囲が低い多孔質材料の外側吸音材内を通過する際に低周波数の音を吸収する。
これにより、多孔質材料からなる内層材で高周波数の音を吸収した後に、多孔質材料の外側吸音材内で低周波数の音を吸収することができて、吸収周波数範囲が異なる多孔質材料からなる吸音材を複数層設けて水中から伝播される音を通過させるという、小型で簡単な構造をそなえ、かつ低コストの装置で以って、低周波数音から高周波数音までの広い周波数範囲の音を確実に吸収し得る吸音構造体を提供できる。 According to this invention, when the sound propagated through the water passes through the inner layer material facing the water among the plural layers of porous material sound absorbing materials having different absorption frequency ranges in the sound absorbing structure, for example, a high frequency sound. Then, when this sound passes through the outer sound absorbing material of a porous material whose absorption frequency range is lower than that of the inner layer material, for example, a low frequency sound is absorbed.
Thus, after absorbing high-frequency sound with the inner layer material made of porous material, low-frequency sound can be absorbed within the outer sound-absorbing material of the porous material, and from the porous material with different absorption frequency range A low-cost device with a small and simple structure that allows multiple layers of sound-absorbing material to pass through the sound propagated from the water, and has a wide frequency range from low-frequency sound to high-frequency sound. It is possible to provide a sound absorbing structure that can reliably absorb sound.

また、かかる発明において好ましくは、前記吸音構造体は、前記複数層の吸音材を表面を互いに接触させて積層し、外側に配置された吸音材の表面と前記支持体の内面との間に水、空気等の流体が収容される空間層を形成してなる。
ここで、多孔質材料からなる吸音材の背後に空間層を形成することで、低周波数領域の吸音率が上昇する原理は次のとおりである。
即ち、多孔質材料での吸音は、音波伝搬時に生じる粒子速度により多孔質部分で摩擦が生じ、音が熱に変化することでなされる。従って、粒子速度が最大になる位置に多孔質材料を設置することで効果的に吸音される。前記粒子速度が最大となるのは、壁面から1/4波長の位置である。かかる距離が遠ざかるほど、前記1/4波長に対応する周波数は低くなるため、該空間層を形成することにより、低周波数領域での吸音効果が上昇する。
従って前記原理によって、水中を伝播される音が複数層の吸音材を積層した吸音構造体を通過する際に各層の吸音材で吸収した周波数の音よりも低周波数領域での吸音効果を、前記水、空気等の流体が収容される空間層を形成することにより向上できる。
これにより、前記複数層の吸音材で中、高周波数の音を吸収し、前記空間層の形成によって低周波数領域の吸音率を向上することにより、低周波数から高周波数まで吸収周波数範囲を拡大できる。 Preferably, in the invention, the sound absorbing structure is formed by laminating the sound absorbing materials of the plurality of layers so that the surfaces thereof are in contact with each other, and water is interposed between the surface of the sound absorbing material disposed outside and the inner surface of the support. A space layer in which a fluid such as air is accommodated is formed.
Here, the principle of increasing the sound absorption coefficient in the low frequency region by forming a space layer behind the sound absorbing material made of a porous material is as follows.
That is, sound absorption in the porous material is performed by friction generated in the porous portion due to the particle velocity generated during sound wave propagation, and the sound is changed to heat. Therefore, sound is effectively absorbed by installing a porous material at a position where the particle velocity is maximized. The particle velocity is maximized at a position of 1/4 wavelength from the wall surface. The farther the distance is, the lower the frequency corresponding to the quarter wavelength. Therefore, the sound absorption effect in the low frequency region is increased by forming the space layer.
Therefore, according to the above principle, the sound absorption effect in the lower frequency region than the sound of the frequency absorbed by the sound absorbing material of each layer when the sound propagated in water passes through the sound absorbing structure in which a plurality of sound absorbing materials are laminated, It can be improved by forming a space layer in which a fluid such as water or air is accommodated.
Thereby, it is possible to expand the absorption frequency range from a low frequency to a high frequency by absorbing sound of medium and high frequencies with the sound absorbing material of the plurality of layers and improving the sound absorption rate in the low frequency region by forming the space layer. .

また本発明は、音を吸収する吸音構造体を水中に臨んで設け、該吸音構造体により前記水中を伝播される音を吸収するように構成された水中吸音装置において、前記吸音構造体は、多孔質材料からなり前記水中に臨む内面が複数の楔状の歯が連設された楔状凹凸面に形成されてなる吸音材を備え、該吸音材をコンクリート等の硬質材料からなる支持体の内側に支持してなり、前記水中を伝播される音を前記楔状凹凸面から前記吸音材に入射して該吸音材内を通過せしめることにより吸音するように構成されてなることを特徴とする。   Also, the present invention provides a sound absorbing structure that absorbs sound and is provided so as to face the water, and is configured to absorb the sound that is propagated through the water by the sound absorbing structure. A sound absorbing material comprising a porous material and an inner surface facing the water formed on a wedge-shaped uneven surface in which a plurality of wedge-shaped teeth are continuously provided, and the sound absorbing material is provided inside a support made of a hard material such as concrete. The sound propagating in the water is configured to absorb sound by being incident on the sound absorbing material through the wedge-shaped uneven surface and passing through the sound absorbing material.

そして、かかる発明において、具体的には前記吸音構造体を次のように構成するのがよい。
（１）前記楔状凹凸面を有する吸音材の外面を前記支持体の内面に固着する。
（２）前記楔状凹凸面を有する吸音材と前記支持体との間に、板状に形成され前記楔状凹凸面を有する吸音材とは吸収周波数範囲が異なる多孔質材料からなる他の吸音材を１層または複数層設け、楔状凹凸面を有する吸音材及び前記他の吸音材及び前記支持体の内面を互いに固着する。
（３）前記楔状凹凸面を有する吸音材と前記支持体との間、あるいは前記楔状凹凸面を有する吸音材と多孔質材料からなる他の吸音材との間、あるいは前記他の吸音材同士の間、及び前記他の吸音材と前記支持体との間の少なくとも１箇所に、水、空気等の流体が収容される空間層を形成する。 In this invention, specifically, the sound absorbing structure is preferably configured as follows.
(1) The outer surface of the sound absorbing material having the wedge-shaped uneven surface is fixed to the inner surface of the support.
(2) Between the sound absorbing material having the wedge-shaped uneven surface and the support, another sound absorbing material made of a porous material that is formed in a plate shape and has a different absorption frequency range from the sound absorbing material having the wedge-shaped uneven surface. One or a plurality of layers are provided, and the sound absorbing material having a wedge-shaped uneven surface, the other sound absorbing material, and the inner surface of the support are fixed to each other.
(3) Between the sound absorbing material having the wedge-shaped uneven surface and the support, or between the sound absorbing material having the wedge-shaped uneven surface and another sound absorbing material made of a porous material, or between the other sound absorbing materials. A space layer in which a fluid such as water or air is accommodated is formed in at least one place between the other sound absorbing material and the support.

かかる発明によれば、水中を伝播される音が前記多孔質材料吸音材の楔状凹凸面を通過する際に該楔状凹凸面により高周波数の音を吸収でき、次いでこの音が多孔質の吸音材内部を通過する際にこれよりも低周波数の音を吸収することができることとなり、従って前記楔状凹凸面を有する吸音材により、低周波数と高周波数の２段階の周波数の吸音が可能となる。
また前記構成（２）のように、前記楔状凹凸面を有する吸音材と、これとは吸収周波数範囲が異なる多孔質材料からなる他の吸音材とを積層して形成すれば、前記楔状凹凸面を有する吸音材により比較的高周波数の２段階の周波数の音を吸収したうえに、前記他の吸音材により前記２段階の周波数とは異なる低周波数の音を吸収することができて、３段階の広範囲の周波数の音を吸収できる。 According to this invention, when sound propagated through water passes through the wedge-shaped uneven surface of the porous material sound-absorbing material, high-frequency sound can be absorbed by the wedge-shaped uneven surface, and this sound is then absorbed by the porous sound-absorbing material. When passing through the inside, sound having a lower frequency than this can be absorbed. Therefore, the sound-absorbing material having the wedge-shaped uneven surface can absorb sound at two stages of low frequency and high frequency.
Further, as in the configuration (2), if the sound absorbing material having the wedge-shaped uneven surface and the other sound absorbing material made of a porous material having a different absorption frequency range are laminated, the wedge-shaped uneven surface In addition to absorbing a sound having a relatively high frequency of two stages by the sound absorbing material having the above, the other sound absorbing material can absorb a low frequency sound different from the two stages of the frequency, and the three stages. Can absorb sound in a wide range of frequencies.

さらに前記構成（３）のように、各吸音材の間に、水、空気等の流体が収容される空間層を形成すれば、前記のような３段階の周波数の音を吸収できるのに加えて、該空間層の形成によって吸音帯域が低周波数帯域まで拡大され、従って前記楔状凹凸面、これを有する吸音材の内部、前記他の吸音材の内部、及び前記空間層内において、４段階の周波数の音を吸収できる。   Further, as in the configuration (3), if a space layer that accommodates a fluid such as water or air is formed between the respective sound absorbing materials, in addition to absorbing the sound of the above three stages of frequencies, Thus, the sound absorption band is expanded to a low frequency band by the formation of the spatial layer, and therefore there are four stages in the wedge-shaped uneven surface, the interior of the sound absorbing material having this, the interior of the other sound absorbing material, and the spatial layer. Can absorb sound of frequency.

また本発明は、音を吸収する吸音構造体を水中に臨んで設け、該吸音構造体により前記水中を伝播される音を吸収するように構成された水中吸音装置において、前記吸音構造体は、多孔質材料からなる板状の吸音材をコンクリート等の硬質材料からなる支持体の内側に、水、空気等の流体が収容される空間層を介して設けられてなり、前記空間層は前記吸音材の表面に直角な方向の長さを変化させて形成されたことを特徴とする。   Also, the present invention provides a sound absorbing structure that absorbs sound and is provided so as to face the water, and is configured to absorb the sound that is propagated through the water by the sound absorbing structure. A plate-like sound absorbing material made of a porous material is provided inside a support made of a hard material such as concrete via a space layer containing a fluid such as water or air, and the space layer is made of the sound absorbing material. It is characterized by being formed by changing the length in the direction perpendicular to the surface of the material.

かかる発明によれば、前記多孔質材料からなる板状の吸音材と硬質材料からなる支持体との間に形成される空間層の長さを変化させることにより、該空間層を通過する音の吸収周波数（低周波数）を空間層の長さに対応した周波数となり、その結果、吸収周波数域を均一にすることができ、殊に低周波数域で吸収周波数の範囲を均一にかつ広げることが可能となる。   According to this invention, by changing the length of the space layer formed between the plate-like sound absorbing material made of the porous material and the support made of the hard material, the sound passing through the space layer can be changed. The absorption frequency (low frequency) becomes a frequency corresponding to the length of the spatial layer. As a result, the absorption frequency range can be made uniform, and the absorption frequency range can be made uniform and wide, especially in the low frequency range. It becomes.

本発明によれば、吸音構造体の多孔質材料からなる内層材で高周波数の音を吸収した後に、多孔質材料の外側吸音材内で低周波数の音を吸収することができて、吸収周波数範囲が異なる多孔質材料からなる吸音材を複数層設けて水中から伝播される音を通過させるという、小型で簡単な構造をそなえ、かつ低コストの装置で以って、低周波数音から高周波数音までの広い周波数範囲の音を確実に吸収し得る吸音構造体を提供できる。   According to the present invention, after absorbing high-frequency sound with the inner layer material made of the porous material of the sound-absorbing structure, low-frequency sound can be absorbed within the outer sound-absorbing material of the porous material. With a low-cost device that has a small and simple structure that allows multiple layers of sound-absorbing materials made of porous materials with different ranges to pass through the sound propagated from the water. A sound absorbing structure capable of reliably absorbing sound in a wide frequency range up to sound can be provided.

また、前記吸音構造体の多孔質材料の吸音材を楔状凹凸面を有する吸音材とすることにより、比較的高周波数の２段階の周波数の音を吸収でき、あるいは多孔質材料の吸音材と水、空気等の流体が収容される空間層とを組み合わせることにより低周波数から高周波数まで広範囲の周波数の音を吸収できる。
さらに、多孔質材料からなる板状の吸音材と支持体との間に形成される空間層の長さを変化させることにより、該空間層を通過する音の吸収周波数を空間層の長さに対応した周波数とすることが可能となり、その結果、吸収周波数域を均一にすることができ、殊に低周波数域で吸収周波数の範囲を均一にかつ広げることが可能となる。 Further, by making the sound absorbing material of the porous material of the sound absorbing structure a sound absorbing material having a wedge-shaped uneven surface, it is possible to absorb a sound having a relatively high frequency of two stages, or a sound absorbing material of porous material and water. By combining with a space layer in which a fluid such as air is accommodated, it is possible to absorb a wide range of frequencies from low to high frequencies.
Further, by changing the length of the spatial layer formed between the plate-like sound absorbing material made of a porous material and the support, the absorption frequency of the sound passing through the spatial layer is changed to the length of the spatial layer. Corresponding frequencies can be obtained, and as a result, the absorption frequency range can be made uniform, and the range of the absorption frequency can be made uniform and wide, particularly in the low frequency range.

以下、本発明を図に示した実施例を用いて詳細に説明する。但し、この実施例に記載されている構成部品の寸法、材質、形状、その相対配置などは特に特定的な記載がない限り、この発明の範囲をそれのみに限定する趣旨ではなく、単なる説明例にすぎない。   Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.

図９は本発明の第１実施例に係る吸音構造体を備えた無響水槽（吸音水槽）の要部断面図であり、図において１００は上面が開放された筐体からなる無響水槽で、内部は水が収容された水室１０１となっている。１は該無響水槽１００の外殻を構成する支持体で、コンクリート、レンガ等の硬質材料からなる。
１０はその内面を前記水室１０１に臨んで設けられた吸音構造体（詳細は後述）で、前記支持体１の内側に複数の支持部材２を介して支持され、前記水室１０１に臨む内層材１１及び外層材１２を積層して形成されている。１３は該外層材１２の外面と前記支持体１の内面との間に形成された空間層である。 FIG. 9 is a cross-sectional view of an essential part of an anechoic water tank (sound absorbing water tank) provided with the sound absorbing structure according to the first embodiment of the present invention. In FIG. 9, reference numeral 100 denotes an anechoic water tank comprising a casing having an open upper surface. The interior is a water chamber 101 containing water. Reference numeral 1 denotes a support constituting the outer shell of the anechoic water tank 100, which is made of a hard material such as concrete or brick.
Reference numeral 10 denotes a sound absorbing structure (the details will be described later) provided with its inner surface facing the water chamber 101, and is supported on the inner side of the support 1 via a plurality of support members 2, and is an inner layer facing the water chamber 101. The material 11 and the outer layer material 12 are laminated. A space layer 13 is formed between the outer surface of the outer layer material 12 and the inner surface of the support 1.

図１は本発明の第１実施例に係る吸音構造体の要部断面図であり、図において、１０は吸音構造体で、内面１１ａが前記水室１０１に臨む内層材１１、該内層材１１の外側に配置された外層材１２、該外層材１２の外面１２ａと前記支持体１の内面との間に形成された空間層１３等からなる。該空間層１３には水が収容されている（シリコン等の音響的特性が水に近いものでもよい）。
前記内層材１１と外層材１２とは、該内層材１１の外面１１ｂと外層材１２の内面１２ｂとは互いに接触させて（固着してもよい）設置されている。該吸音構造体１０は、前記支持体１の内側に複数の支持部材２を介して支持されている。 FIG. 1 is a cross-sectional view of an essential part of a sound absorbing structure according to a first embodiment of the present invention. In the figure, reference numeral 10 denotes a sound absorbing structure, an inner layer material 11 having an inner surface 11a facing the water chamber 101, and the inner layer material 11 An outer layer material 12 disposed on the outer side of the outer layer material 12, a space layer 13 formed between the outer surface 12 a of the outer layer material 12 and the inner surface of the support 1. Water is contained in the space layer 13 (acoustic characteristics such as silicon may be close to water).
The inner layer material 11 and the outer layer material 12 are installed such that the outer surface 11b of the inner layer material 11 and the inner surface 12b of the outer layer material 12 are in contact with each other (may be fixed). The sound absorbing structure 10 is supported inside the support 1 via a plurality of support members 2.

前記内層材１１と外層材１２とは、吸収周波数範囲が異なる多孔質材料で構成され、この実施例においては、前記内層材１１は吸収周波数ｆが図１０（Ａ）Ｓ１線で示されるような高周波数域で吸音率αが高くなるような材料で構成され、発泡アルミニウム材を板状に形成したもの、細径の線材を固めて板状に形成したもの等が好適である。
また、前記外層材１２は吸収周波数ｆが図１０（Ａ）のＳ２線で示されるような低周波数域で吸音率αが高くなるような材料で構成され、低周波数域で高い吸音率αを示すセラミック材が好適である。
尚、この実施例とは逆に、前記内層材１１にセラミック材等の低周波数域で吸音率αが高くなる材料を用い、外層材１２に発泡アルミニウム材等の高周波数域で吸音率αが高くなるような材料を用いることも可能である。 The inner layer material 11 and the outer layer material 12 are made of porous materials having different absorption frequency ranges. In this embodiment, the inner layer material 11 has an absorption frequency f as shown by line S1 in FIG. A material that is made of a material having a high sound absorption coefficient α in a high frequency region and is formed of a foamed aluminum material in a plate shape, a material in which a thin wire is solidified and formed in a plate shape, or the like is preferable.
Further, the outer layer material 12 is made of a material whose absorption frequency f is high in the low frequency range as indicated by the line S2 in FIG. 10A, and has a high sound absorption rate α in the low frequency range. The ceramic materials shown are preferred.
Contrary to this embodiment, the inner layer material 11 is made of a material having a high sound absorption coefficient α in a low frequency range such as a ceramic material, and the outer layer material 12 has a sound absorption coefficient α in a high frequency range such as a foamed aluminum material. It is also possible to use a material that is high.

かかる第１実施例において、水室１０１内の水中に伝播された音は、吸収周波数ｆが図１０（Ａ）Ｓ１線で示されるような高周波数域で吸音率αが高くなるような材料で構成された前記内層材１１内を通過する際に高周波数音が吸収され、次いで吸収周波数ｆが図１０（Ａ）のＳ２線で示されるような低周波数域で吸音率αが高くなるような材料で構成された前記外層材１２を通過する際に低周波数音が吸収される。
さらに、前記内層材１１及び外層材１２で、前記のように高周波数音及び低周波数音が吸収された音は、水が収容された前記空間層１３の形成によって、図１０のＳ３線で示されるように前記内層材１１及び外層材１２よりもさらに低周波数域で吸音率αが高くなる該空間層１３において、低周波数音の吸収効果がさらに向上する。
以上により、図１０（Ｂ）のＳ４線で示すような、かかる内層材１１、外層材１２、及び空間層１３での３段階の吸音作用によって、前記音のレベルは低い音圧レベルまで低下せしめられる。 In the first embodiment, the sound propagated into the water in the water chamber 101 is made of a material whose absorption frequency f is high in the high frequency region as shown by the line S1 in FIG. 10 (A). High frequency sound is absorbed when passing through the constructed inner layer material 11, and then the absorption frequency f is increased in a low frequency region as indicated by line S2 in FIG. 10A. Low-frequency sound is absorbed when passing through the outer layer material 12 made of a material.
Furthermore, the sound in which the high-frequency sound and the low-frequency sound are absorbed as described above by the inner layer material 11 and the outer layer material 12 is indicated by a line S3 in FIG. 10 due to the formation of the space layer 13 containing water. As described above, in the spatial layer 13 where the sound absorption coefficient α is higher in the lower frequency region than the inner layer material 11 and the outer layer material 12, the effect of absorbing low frequency sound is further improved.
As described above, the sound level is lowered to a low sound pressure level by the three-stage sound absorbing action in the inner layer material 11, the outer layer material 12, and the space layer 13 as shown by the line S4 in FIG. 10B. It is done.

従って、かかる実施例によれば、水中を伝播される音を、吸音構造体１０における吸収周波数範囲が異なる複数層の多孔質材料吸音材のうちの水室１０１に臨む内層材１１を通過する際に高周波数音を吸収し、次いでこの音が該内層材１１よりも吸収周波数範囲が低い多孔質材料の外層材１２内を通過する際に低周波数の音を吸収し、空間層１３の形成によって吸音帯域が低周波数帯域まで拡大される。
これにより、吸収周波数範囲が異なる多孔質材料からなる内層材１１及び外層材１２（吸音材）を複数層設けて中、高周波数の音を吸収し、外層材１２と支持体１との間に空間層１３を形成して低周波数音まで吸音帯域を拡大するという、小型で簡単な構造をそなえ、かつ低コストの装置で以って、低周波数音から高周波数音までの広い周波数範囲の音を確実に吸収し得る吸音構造体１０が得られる。 Therefore, according to this embodiment, when the sound propagated in water passes through the inner layer material 11 facing the water chamber 101 among the plural layers of porous material sound absorbing materials having different absorption frequency ranges in the sound absorbing structure 10. The high-frequency sound is absorbed into the outer layer material 12 of the porous material whose absorption frequency range is lower than that of the inner layer material 11, and the low-frequency sound is absorbed. The sound absorption band is expanded to the low frequency band.
Accordingly, a plurality of layers of the inner layer material 11 and the outer layer material 12 (sound absorbing material) made of porous materials having different absorption frequency ranges are provided to absorb high-frequency sound, and between the outer layer material 12 and the support 1. With a low-cost device that has a small and simple structure that forms the spatial layer 13 and expands the sound absorption band to low-frequency sounds, it has a wide frequency range from low-frequency sounds to high-frequency sounds. The sound-absorbing structure 10 that can reliably absorb the above is obtained.

また、かかる第１実施例において、前記内層材１１及び外層材１２の材料として、発泡コンクリート材、レンガ材、ポーラス状プラスチックを、前記発泡金属、細径の線材を固めて板状に形成した材料、セラミック材等と組み合わせて用いることもできる。
さらに、前記１層の内層材１１に対して、該内層材１１とは吸収周波数ｆが異なる２層以上の外層材１２を積層して用いることもできる。 Further, in the first embodiment, as the material of the inner layer material 11 and the outer layer material 12, a foamed concrete material, a brick material, and a porous plastic are formed into a plate shape by solidifying the foam metal and a thin wire material. It can also be used in combination with a ceramic material or the like.
Furthermore, two or more outer layer materials 12 having different absorption frequencies f from the inner layer material 11 may be laminated on the one layer inner material 11.

図２は本発明の第２実施例を示す図１対応図である。
この実施例においては、前記第１実施例（図１）から空間層１３を除去し、前記外層材１２の外面１２ａを前記支持体１の内面に直接固着している。この場合は前記第１実施例
における空間層１３による低周波音の吸音効果はないが、外層材１２の外面１２ａを前記支持体１の内面に直接固着しており前記空間層１３のスペースが不要となるので、吸音構造体１０が小型で簡単化される。
その他の構成は前記第１実施例と同様であり、これと同一の部材は同一の符号で示す。 FIG. 2 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.
In this embodiment, the space layer 13 is removed from the first embodiment (FIG. 1), and the outer surface 12 a of the outer layer material 12 is directly fixed to the inner surface of the support 1. In this case, there is no sound absorption effect of the low frequency sound by the space layer 13 in the first embodiment, but the outer surface 12a of the outer layer material 12 is directly fixed to the inner surface of the support 1, and the space of the space layer 13 is unnecessary. Therefore, the sound absorbing structure 10 is small and simplified.
Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.

図３は本発明の第３実施例を示す図１対応図である。
この実施例においては、吸音構造体１０を次のように構成している。
即ち、図３において、１１は吸音構造体１０の前記第１実施例と同様な多孔質材料からなる内層材であり、前記水室１０１の水中に臨む内面１１ａを、複数の楔状の歯１１ｃと溝１１ｄが交互に連設された楔状凹凸面に形成している。また、該内層材１１の外面１１ｂは前記支持体１の内面に接触あるいは固着されている。 FIG. 3 is a view corresponding to FIG. 1 showing a third embodiment of the present invention.
In this embodiment, the sound absorbing structure 10 is configured as follows.
That is, in FIG. 3, 11 is an inner layer material made of a porous material similar to that of the first embodiment of the sound absorbing structure 10, and the inner surface 11a facing the water of the water chamber 101 is connected to a plurality of wedge-shaped teeth 11c. Grooves 11d are formed on a wedge-shaped uneven surface provided alternately. The outer surface 11 b of the inner layer material 11 is in contact with or fixed to the inner surface of the support 1.

かかる第３実施例において、前記内層材１１の内部の吸収周波数ｆは、図１１のＳ１２線で示されるように低周波数域で吸音率αが高くなっている。一方、前記内層材１１の内面１１ａを形成する楔状凹凸面においては、図１１のＳ１１線で示されるように前記内層材１１の内部よりも高い周波数域で吸音率αが高くなる。
従って、かかる第３実施例によれば、水中を伝播される音を、内層材１１の内面１１ａを形成する楔状凹凸面を通過する際に高周波数音を吸収し、次いでこの音が該楔状凹凸面（１１ａ）よりも吸収周波数範囲が低い内層材１１の内部を通過する際に低周波数音を吸収することが可能となり、前記楔状凹凸面からなる内面１１ａを有する内層材１１を設置することにより、図１２のＳ１４線で示されるように高周波数と低周波数の２段階の周波数の吸音が可能となる。 In the third embodiment, the absorption frequency f inside the inner layer material 11 has a high sound absorption coefficient α in the low frequency region as shown by the line S12 in FIG. On the other hand, the wedge-shaped uneven surface forming the inner surface 11a of the inner layer material 11 has a higher sound absorption coefficient α in a higher frequency range than the inside of the inner layer material 11 as shown by the line S11 in FIG.
Therefore, according to the third embodiment, when the sound propagated through water passes through the wedge-shaped uneven surface forming the inner surface 11a of the inner layer material 11, the high-frequency sound is absorbed, and then this sound is the wedge-shaped uneven By passing the inside of the inner layer material 11 having a lower absorption frequency range than the surface (11a), it is possible to absorb low frequency sound, and by installing the inner layer material 11 having the inner surface 11a composed of the wedge-shaped uneven surface. As shown by the S14 line in FIG. 12, it is possible to absorb sound at two stages of high and low frequencies.

図４は本発明の第４実施例を示す図１対応図である。
この実施例においては、前記第３実施例に加えて、前記楔状凹凸面からなる内面１１ａを有する内層材１１と前記支持体１との間に、板状に形成され前記楔状凹凸面を有する内層材１１よりも吸収周波数ｆが低い多孔質材料の外層材１２を設け、該外層材１２の内面１２ａと内層材１１の外面１１ｂとを固着するとともに、該外層材１２の外面１２ａと前記支持体１の内面とを互いに固着している。 FIG. 4 is a block diagram corresponding to FIG. 1 showing a fourth embodiment of the present invention.
In this embodiment, in addition to the third embodiment, an inner layer having a wedge-shaped uneven surface formed in a plate shape between an inner layer material 11 having an inner surface 11a composed of the wedge-shaped uneven surface and the support 1 is provided. An outer layer material 12 of a porous material having an absorption frequency f lower than that of the material 11 is provided, and the inner surface 12a of the outer layer material 12 and the outer surface 11b of the inner layer material 11 are fixed, and the outer surface 12a of the outer layer material 12 and the support body 1 are fixed to each other.

かかる第４実施例によれば、前記楔状凹凸面を有する内層材１１と前記支持体１との間に、該内層材１１よりも吸収周波数ｆが低い多孔質材料の外層材１２を設けたので、図１３（Ｂ）のＳ２１線で示されるように、楔状凹凸面からなる内面１１ａを通過する際に高周波数音（Ｓ２）を吸音し、次いで内層材１１内を通過する際にこれよりも低周波数音（Ｓ１（図１３（Ａ）参照））を吸音することにより２段階の周波数の吸音をなし、さらに図１３（Ｃ）のＳ３線のような低周波数音の吸音特性を有する外層材１２を通過することにより、図１３（Ｄ）のＳ０線のように、３段階の周波数の音を吸収できる。
その他の構成は前記第３実施例と同様であり、これと同一の部材は同一の符号で示す。 According to the fourth embodiment, the outer layer material 12 made of a porous material having an absorption frequency f lower than that of the inner layer material 11 is provided between the inner layer material 11 having the wedge-shaped uneven surface and the support 1. As shown by the line S21 in FIG. 13B, the high-frequency sound (S2) is absorbed when passing through the inner surface 11a made of a wedge-shaped uneven surface, and then when passing through the inner layer material 11, more than this. An outer layer material that absorbs low-frequency sound (S1 (see FIG. 13A)) to absorb two-frequency frequencies, and further has low-frequency sound absorption characteristics such as the S3 line in FIG. 13C. By passing through 12, it is possible to absorb the sound of three stages of frequencies as shown by the line S0 in FIG.
The other structure is the same as that of the said 3rd Example, and the same member is shown with the same code | symbol.

図５は本発明の第５実施例を示す図１対応図である。
この実施例においては、前記第３実施例（図３）に加えて、前記楔状凹凸面からなる内面１１ａを有する内層材１１と前記支持体１との間に、水が収容された空間層１３を形成している。
かかる第５実施例によれば、楔状凹凸面からなる内面１１ａを通過する際に高周波数音を吸音し、次いで内層材１１内を通過する際にこれよりも低周波数音を吸音することにより２段階の周波数の吸音をなし、水が収容された空間層１３においてさらに低周波数域に吸音域が拡大することにより、３段階の周波数の音を吸収できる。
その他の構成は前記第３実施例と同様であり、これと同一の部材は同一の符号で示す。 FIG. 5 is a block diagram corresponding to FIG. 1 showing a fifth embodiment of the present invention.
In this embodiment, in addition to the third embodiment (FIG. 3), a space layer 13 in which water is accommodated between the support member 1 and the inner layer material 11 having the inner surface 11a composed of the wedge-shaped uneven surface. Is forming.
According to the fifth embodiment, a high-frequency sound is absorbed when passing through the inner surface 11a made of a wedge-shaped uneven surface, and then a low-frequency sound is absorbed when passing through the inner layer material 11, thereby reducing 2 By absorbing the sound at the stepped frequency and further expanding the sound absorbing region to the low frequency region in the space layer 13 in which water is accommodated, it is possible to absorb the sound at the three stepped frequencies.
The other structure is the same as that of the said 3rd Example, and the same member is shown with the same code | symbol.

図６は本発明の第６実施例を示す図１対応図である。
この実施例においては、前記第４実施例（図４）に加えて、前記楔状凹凸面からなる内面１１ａを有する内層材１１の外側に固着された外層材１２と前記支持体１との間に、水が収容された空間層１３を形成している。
かかる第６実施例によれば、内層材１１の楔状凹凸面からなる内面１１ａを通過する際に高周波数音を吸音し、次いで内層材１１内を通過する際にこれよりも低周波数音を吸音し、さらに前記内層材１１よりも低周波数音の吸音特性を有する外層材１２を通過することにより、３段階の周波数の音を吸収できる。
その他の構成は前記第４実施例と同様であり、これと同一の部材は同一の符号で示す。 FIG. 6 is a block diagram corresponding to FIG. 1, showing a sixth embodiment of the present invention.
In this embodiment, in addition to the fourth embodiment (FIG. 4), the outer layer material 12 fixed to the outer side of the inner layer material 11 having the inner surface 11a composed of the wedge-shaped uneven surface and the support 1 are provided. The space layer 13 in which water is accommodated is formed.
According to the sixth embodiment, the high-frequency sound is absorbed when passing through the inner surface 11a formed of the wedge-shaped uneven surface of the inner layer material 11, and then the low-frequency sound is absorbed when passing through the inner layer material 11. Furthermore, by passing through the outer layer material 12 having a sound absorption characteristic of lower frequency sound than that of the inner layer material 11, it is possible to absorb sound having three stages of frequencies.
The other structure is the same as that of the said 4th Example, The same member is shown with the same code | symbol.

図７は本発明の第７実施例を示す図１対応図である。
この実施例においては、前記第５実施例（図５）に加えて、水が収容された（空気でもよい）空間層１３内に、前記内層材１１よりも吸収周波数ｆが低い多孔質材料の外層材１２を設けて、該外層材１２により２つの空間層１３、１３に区画している。
かかる第７実施例によれば、内層材１１の楔状凹凸面からなる内面１１ａを通過する際に高周波数音を吸音し、次いで該内層材１１内を通過する際にこれよりも低周波数音を吸音する。さらに、前記内層材１１よりも低周波数音の吸音特性を有する外層材１２を通過する前及び後に、水が収容された空間層１３を通すことにより、２段階で低周波数音の吸音をなすことができる。
これにより、前記楔状凹凸面からなる内面１１ａ、内層材１１内、内側の空間層１３内、外層材１２内、外側の空間層１３内の５段階の周波数の音を吸収できる。
尚、前記外層材１２を２個以上設けて、各外層材１２により複数の空間層１３に区画するように構成してもよい。
その他の構成は前記第５実施例と同様であり、これと同一の部材は同一の符号で示す。 FIG. 7 is a block diagram corresponding to FIG. 1 showing a seventh embodiment of the present invention.
In this embodiment, in addition to the fifth embodiment (FIG. 5), a porous material having a lower absorption frequency f than the inner layer material 11 is contained in the space layer 13 containing water (may be air). An outer layer material 12 is provided, and the outer layer material 12 is divided into two spatial layers 13 and 13.
According to the seventh embodiment, the high-frequency sound is absorbed when passing through the inner surface 11a formed of the wedge-shaped uneven surface of the inner layer material 11, and then the lower frequency sound is heard when passing through the inner layer material 11. Absorb sound. Further, before passing through the outer layer material 12 having a sound absorption characteristic of low frequency sound than the inner layer material 11, the low frequency sound is absorbed in two stages by passing through the space layer 13 containing water. Can do.
As a result, it is possible to absorb sound having five levels of frequencies in the inner surface 11a, the inner layer material 11, the inner space layer 13, the outer layer material 12, and the outer space layer 13 formed of the wedge-shaped uneven surface.
Two or more outer layer materials 12 may be provided, and each outer layer material 12 may be divided into a plurality of space layers 13.
Other configurations are the same as those of the fifth embodiment, and the same members are denoted by the same reference numerals.

図８は本発明の第８実施例を示す図１対応図である。
この実施例においては、前記第１実施例と同様な、吸収周波数ｆが高周波数域で吸音率αが高くなるような材料で構成された内層材１１と前記支持体１との間に水が収容された空間層１３を形成し、該空間層１３の前記内層材１１の表面に直角な方向の長さ、つまり内層材１１の外面１１ｂと前記支持体１の内面１ａ、１ｂとの長さをＬ１、Ｌ２のように変化させている。
かかる第８実施例によれば、多孔質材料からなる板状の内層材１１と硬質材料からなる支持体１との間に形成される空間層１３の長さを変化させることにより、該空間層１３を通過する音の吸収周波数（低周波数）を空間層１３の長さに対応した周波数となり、その結果、図１４の実線で示されるように、吸収周波数域を均一にすることができ、殊に低周波数域で吸収周波数の範囲を均一にかつ広げることが可能となる。
尚、前記長さをＬ１、Ｌ２のように変化させて設けられた空間層１３は、支持材を介して分割するように構成してもよい。
尚、前記第１実施例と同一の部材は同一の符号で示す。 FIG. 8 is a block diagram corresponding to FIG. 1 showing an eighth embodiment of the present invention.
In this embodiment, as in the first embodiment, there is water between the support 1 and the inner layer material 11 made of a material that has a high absorption frequency f and a high sound absorption coefficient α. The accommodated space layer 13 is formed, and the length of the space layer 13 in the direction perpendicular to the surface of the inner layer material 11, that is, the length of the outer surface 11 b of the inner layer material 11 and the inner surfaces 1 a and 1 b of the support 1. Are changed to L1 and L2.
According to the eighth embodiment, by changing the length of the space layer 13 formed between the plate-like inner layer material 11 made of a porous material and the support 1 made of a hard material, the space layer is changed. The absorption frequency (low frequency) of the sound passing through 13 becomes a frequency corresponding to the length of the spatial layer 13, and as a result, the absorption frequency range can be made uniform as shown by the solid line in FIG. In addition, the absorption frequency range can be expanded uniformly in the low frequency range.
In addition, you may comprise so that the space layer 13 provided by changing the said length like L1 and L2 may be divided | segmented through a support material.
The same members as those in the first embodiment are denoted by the same reference numerals.

本発明は前記各実施例に限られることなく、水中に設置される吸音壁等の、音を吸収する吸音構造体を水中に臨んで設け、該吸音構造体により水中を伝播される音を吸収するように構成された水中吸音装置全般に適用できる。   The present invention is not limited to the above-described embodiments, and a sound absorbing structure that absorbs sound, such as a sound absorbing wall installed in water, is provided facing the water, and the sound transmitted through the water is absorbed by the sound absorbing structure. The present invention can be applied to all underwater sound absorbing devices configured as described above.

本発明によれば、小型かつ低コストの構造で以って、低周波音から高周波音まで広範囲の周波数域の音に対して高い吸音効果を有する吸音構造体をそなえて、殊に無響水槽（吸音水槽）に好適な水中吸音装置を提供できる。   According to the present invention, it is possible to provide a sound absorbing structure having a high sound absorbing effect with respect to sounds in a wide frequency range from a low frequency sound to a high frequency sound with a small and low cost structure, in particular, an anechoic water tank. An underwater sound absorbing device suitable for (sound absorbing water tank) can be provided.

本発明の第１実施例に係る吸音構造体の要部断面図（図９の部拡大図）である。It is principal part sectional drawing (part enlarged view of FIG. 9) of the sound-absorbing structure which concerns on 1st Example of this invention. 第２実施例を示す図１対応図である。It is a figure corresponding to FIG. 1 which shows 2nd Example. 第３実施例を示す図１対応図である。It is a figure corresponding to FIG. 1 which shows 3rd Example. 第４実施例を示す図１対応図である。It is a figure corresponding to FIG. 1 which shows 4th Example. 第５実施例を示す図１対応図である。FIG. 10 is a view corresponding to FIG. 1 illustrating a fifth embodiment. 第６実施例を示す図１対応図である。It is a figure corresponding to FIG. 1 which shows 6th Example. 第７実施例を示す図１対応図である。FIG. 10 is a view corresponding to FIG. 1 showing a seventh embodiment. 第８実施例を示す図１対応図である。It is a figure corresponding to FIG. 1 which shows 8th Example. 本発明の第１実施例に係る吸音構造体を備えた無響水槽（吸音水槽）の断面図である。It is sectional drawing of the anechoic water tank (sound absorption water tank) provided with the sound absorption structure which concerns on 1st Example of this invention. （Ａ）、（Ｂ）は前記第１実施例における作用説明図である。(A), (B) is operation explanatory drawing in the said 1st Example. 前記第３実施例における作用説明図（その１）である。It is operation | movement explanatory drawing in the said 3rd Example (the 1). 前記第３実施例における作用説明図（その２）である。It is operation | movement explanatory drawing (the 2) in the said 3rd Example. （Ａ）、（Ｂ）、（Ｃ）、（Ｄ）は前記第４実施例における作用説明図である。(A), (B), (C), (D) is an operation explanatory view of the fourth embodiment. 前記第８実施例における作用説明図である。It is action | operation explanatory drawing in the said 8th Example. 従来技術の第１例を示す図１対応図である。It is a figure corresponding to FIG. 1 which shows the 1st example of a prior art. 従来技術の第２例を示す図１対応図である。It is a figure corresponding to FIG. 1 which shows the 2nd example of a prior art.

符号の説明Explanation of symbols

１００ 無響水槽
１０１ 水室
１ 支持体
２ 支持部材
１０ 吸音構造体
１１ 内層材
１１ａ 内層材の内面
１１ｃ 歯
１１ｄ 溝
１２ 外層材
１３ 空間層 DESCRIPTION OF SYMBOLS 100 Anechoic water tank 101 Water chamber 1 Support body 2 Support member 10 Sound absorption structure 11 Inner layer material 11a Inner surface of inner layer material 11c Tooth 11d Groove 12 Outer layer material 13 Space layer

Claims (10)

音を吸収する吸音構造体を水中に臨んで設け、該吸音構造体により前記水中を伝播される音を吸収するように構成された水中吸音装置において、前記吸音構造体は、吸収周波数範囲が異なる多孔質材料からなる複数層の吸音材をコンクリート等の硬質材料からなる支持体の内側に支持されてなり、前記水中を伝播される音を前記複数層の吸音材のうちの前記水中に臨む内層材の内面から入射して他の吸音材内を通過せしめることにより吸音するように構成されたことを特徴とする水中吸音装置。   In an underwater sound absorber configured to provide a sound absorbing structure that absorbs sound in water and absorb the sound propagated through the water by the sound absorbing structure, the sound absorbing structure has a different absorption frequency range. A plurality of sound absorbing materials made of a porous material are supported on the inside of a support made of a hard material such as concrete, and an inner layer facing the water of the sound absorbing materials of the plurality of layers is made to propagate through the water. An underwater sound absorbing device configured to absorb sound by being incident from an inner surface of the material and passing through another sound absorbing material. 前記複数層の吸音材を表面を互いに接触させて積層し、外側に配置された吸音材の表面と前記支持体の内面との間に水、空気等の流体が収容される空間層を形成してなることを特徴とする請求項１記載の水中吸音装置。   The plurality of layers of the sound absorbing material are stacked so that the surfaces are in contact with each other, and a space layer is formed between the surface of the sound absorbing material disposed on the outside and the inner surface of the support to contain a fluid such as water or air. The underwater sound absorbing device according to claim 1, wherein 前記複数層の吸音材を表面を互いに接触させて積層し、外側に配置された吸音材の表面を前記支持体に接触させて固定してなることを特徴とする請求項１記載の水中吸音装置。   The underwater sound absorbing device according to claim 1, wherein the sound absorbing material of the plurality of layers is laminated by bringing the surfaces into contact with each other, and the surface of the sound absorbing material disposed on the outside is fixed in contact with the support. . 音を吸収する吸音構造体を水中に臨んで設け、該吸音構造体により前記水中を伝播される音を吸収するように構成された水中吸音装置において、前記吸音構造体は、多孔質材料からなり前記水中に臨む内面が複数の楔状の歯が連設された楔状凹凸面に形成されてなる吸音材を備えて、該吸音材をコンクリート等の硬質材料からなる支持体の内側に支持してなり、前記水中を伝播される音を前記楔状凹凸面から前記吸音材に入射して該吸音材内を通過せしめることにより吸音するように構成されてなることを特徴とする水中吸音装置。   In the underwater sound absorbing device, wherein the sound absorbing structure is provided facing the water and absorbs the sound propagated through the water by the sound absorbing structure, the sound absorbing structure is made of a porous material. The inner surface facing the water is provided with a sound absorbing material formed on a wedge-shaped uneven surface provided with a plurality of wedge-shaped teeth, and the sound absorbing material is supported inside a support made of a hard material such as concrete. An underwater sound absorbing device configured to absorb sound by allowing sound transmitted through the water to enter the sound absorbing material through the wedge-shaped uneven surface and to pass through the sound absorbing material. 前記楔状凹凸面を有する吸音材の外面を前記支持体の内面に固着してなることを特徴とする請求項４記載の水中吸音装置。   The underwater sound absorbing device according to claim 4, wherein an outer surface of the sound absorbing material having the wedge-shaped uneven surface is fixed to an inner surface of the support. 前記楔状凹凸面を有する吸音材と前記支持体との間に水、空気等の流体が収容される空間層を形成してなることを特徴とする請求項４記載の水中吸音装置。   The underwater sound absorbing device according to claim 4, wherein a space layer in which a fluid such as water or air is accommodated is formed between the sound absorbing material having the wedge-shaped uneven surface and the support. 前記楔状凹凸面を有する吸音材と前記支持体との間に、板状に形成され前記楔状凹凸面を有する吸音材とは吸収周波数範囲が異なる多孔質材料からなる他の吸音材を１層または複数層設けてなることを特徴とする請求項４記載の水中吸音装置。   Between the sound absorbing material having the wedge-shaped uneven surface and the support, one layer of another sound absorbing material made of a porous material formed in a plate shape and having a different absorption frequency range from the sound absorbing material having the wedge-shaped uneven surface The underwater sound absorbing device according to claim 4, wherein a plurality of layers are provided. 前記楔状凹凸面を有する吸音材及び前記他の吸音材及び前記支持体の内面を互いに固着してなることを特徴とする請求項７記載の水中吸音装置。   The underwater sound absorbing device according to claim 7, wherein the sound absorbing material having the wedge-shaped uneven surface, the other sound absorbing material, and the inner surface of the support are fixed to each other. 前記楔状凹凸面を有する吸音材と前記他の吸音材との間、前記他の吸音材同士の間、及び前記他の吸音材と前記支持体との間の、少なくとも１箇所に、水、空気等の流体が収容される空間層を形成してなることを特徴とする請求項７記載の水中吸音装置。   At least one place between the sound absorbing material having the wedge-shaped uneven surface and the other sound absorbing material, between the other sound absorbing materials, and between the other sound absorbing material and the support, water, air The underwater sound absorbing device according to claim 7, wherein a space layer in which a fluid such as a fluid is accommodated is formed. 音を吸収する吸音構造体を水中に臨んで設け、該吸音構造体により前記水中を伝播される音を吸収するように構成された水中吸音装置において、前記吸音構造体は、多孔質材料からなる板状の吸音材をコンクリート等の硬質材料からなる支持体の内側に、水、空気等の流体が収容される空間層を介して設けられてなり、前記空間層は前記吸音材の表面に直角な方向の長さを変化させて形成されたことを特徴とする水中吸音装置。   A sound absorbing structure that absorbs sound is provided facing water, and the sound absorbing structure is configured to absorb sound transmitted through the water by the sound absorbing structure. The sound absorbing structure is made of a porous material. A plate-like sound absorbing material is provided inside a support made of a hard material such as concrete via a space layer containing a fluid such as water or air, and the space layer is perpendicular to the surface of the sound absorbing material. An underwater sound absorbing device formed by changing the length in various directions.
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KR100759372B1 (en) 2006-07-03 2007-10-04 한국과학기술원 Multilayer tiles for absorbing underwater sound
CN104464714A (en) * 2014-11-05 2015-03-25 大连理工大学 Three-dimensional sound invisible cloak structure
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100759372B1 (en) 2006-07-03 2007-10-04 한국과학기술원 Multilayer tiles for absorbing underwater sound
CN104464714A (en) * 2014-11-05 2015-03-25 大连理工大学 Three-dimensional sound invisible cloak structure
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CN106622548A (en) * 2017-02-28 2017-05-10 湖州瀚海科技咨询有限公司 Noise reduction type multistage crushing device
CN108281132A (en) * 2018-03-13 2018-07-13 吉林大学 With Cylindrical Pit bionic non-smooth surface polyurethane foam board and preparation method
JP2021189284A (en) * 2020-05-29 2021-12-13 五洋建設株式会社 Underwater noise suppression construct, method of manufacturing the same, underwater noise suppression structure using the same, and underwater noise suppression method
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