JP3107367B2 - Underwater parallel plate sound insulation structure - Google Patents
Underwater parallel plate sound insulation structureInfo
- Publication number
- JP3107367B2 JP3107367B2 JP09038636A JP3863697A JP3107367B2 JP 3107367 B2 JP3107367 B2 JP 3107367B2 JP 09038636 A JP09038636 A JP 09038636A JP 3863697 A JP3863697 A JP 3863697A JP 3107367 B2 JP3107367 B2 JP 3107367B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- sound insulation
- parallel plate
- insulation structure
- underwater
- 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.)
- Expired - Lifetime
Links
- 238000009413 insulation Methods 0.000 title claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 61
- 230000001902 propagating effect Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 description 10
- 238000005259 measurement Methods 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Landscapes
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は水中を伝搬する騒音
を遮断する水中平行板遮音構造、例えば船舶のプロペラ
などの計測に使用する回流水槽等への設置が好適な水中
平行板遮音構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater parallel plate sound insulation structure for blocking noise propagating in water, for example, an underwater parallel plate sound insulation structure suitable for installation in a circulating water tank used for measurement of propellers and the like of ships.
【０００２】[0002]
【従来の技術】図３は、従来のこの種の回流水槽の一例
の概略を示す図であり、図において、１は回流管で、通
常、その大きさが高さ７ｍ，横幅１３．５ｍ程度あり、
相当の水圧に耐えられるように厚みを有する鉄管等で構
成されている。２は１階部に設けられている送水装置、
３は２階部に設けられている計測部である。送水装置２
は、吸水部１３から絶えず水を吸水して水圧を加え、送
水部１０から所定圧で送水しており、回流管１の中を水
が回流している。2. Description of the Related Art FIG. 3 is a schematic view showing an example of a conventional circulating water tank of this type. Yes,
It is composed of an iron tube or the like having a thickness so as to withstand considerable water pressure. 2 is a water supply device provided on the first floor,
Reference numeral 3 denotes a measuring unit provided on the second floor. Water supply device 2
The water is constantly absorbed from the water absorption section 13 and water pressure is applied thereto, and water is supplied at a predetermined pressure from the water supply section 10, and the water is circulating in the circulation pipe 1.
【０００３】送水装置２から送水された水は、送水部１
０を経てその径が拡張された整流部１１に入り、この整
流部１１で水の流れが整えられ、エルボ部１２を通って
計測部３に至る。この計測部３には、各種の計測機器
（例えばプロペラ動力計，伴流計測装置，雑音計測装
置）が設置されており、被計測対象であるプロペラをこ
の計測部３の水流中に設置して、動力計測，流体計測，
雑音計測等が行われる。[0003] Water supplied from the water supply device 2 is supplied to a water supply unit 1.
After passing through 0, the flow enters the rectification unit 11 whose diameter is expanded, the flow of water is adjusted by the rectification unit 11, and reaches the measurement unit 3 through the elbow unit 12. Various measuring devices (for example, a propeller dynamometer, a wake measuring device, and a noise measuring device) are installed in the measuring unit 3. A propeller to be measured is installed in the water flow of the measuring unit 3. , Power measurement, fluid measurement,
Noise measurement and the like are performed.
【０００４】[0004]
【発明が解決しようとする課題】上記のような従来の回
流水槽では、水中を伝搬する騒音を遮断する積極的な手
段を持たないので、雑音計測において比較的大きなキャ
ビテーションノイズは計測できるが、例えばプロペラ静
止時に発生するような小さな流体雑音の計測が行えない
という問題点があった。すなわち従来の回流水槽では、
送水装置を構成するポンプから発生する騒音が回流を伝
搬して計測部まで伝達されてしまうため、計測部３の騒
音が大きく、流体雑音のような小さな雑音の計測が困難
になる。なお従来の回流水槽では、送水装置に低振動ポ
ンプを用いたり、ポンプを防振台に置いたり、ポンプと
水路との間に弾性部材を介在させる等の措置が取られて
いるものもあるが、これらは防振効果は期待できても遮
音効果は特に期待できない。Since the conventional circulating water tank as described above does not have a positive means for blocking noise propagating in water, relatively large cavitation noise can be measured in noise measurement. There has been a problem that it is not possible to measure a small fluid noise that occurs when the propeller is stationary. That is, in the conventional circulating water tank,
Since the noise generated from the pump constituting the water transmission device propagates in the circulation and is transmitted to the measurement unit, the noise of the measurement unit 3 is large, and it is difficult to measure small noise such as fluid noise. Some conventional circulating water tanks have taken measures such as using a low-vibration pump for the water supply device, placing the pump on a vibration isolator, and interposing an elastic member between the pump and the water channel. However, although they can be expected to have a vibration-proof effect, they cannot expect a sound-insulating effect.
【０００５】本発明はかかる問題点を解決するためにな
されたものであり、回流水槽等への設置が好適な水中平
行板遮音構造を提供することを目的とし、回流水槽へ設
置した場合、回流を伝搬する騒音を低減して被計測対象
が発生する小さな雑音の計測が可能な水中平行板遮音構
造を提供することを目的としている。The present invention has been made in order to solve such a problem, and an object of the present invention is to provide an underwater parallel plate sound insulation structure suitable for installation in a circulating water tank or the like. It is an object of the present invention to provide an underwater parallel plate sound insulation structure capable of measuring small noise generated by an object to be measured by reducing noise propagating through the underwater.
【０００６】[0006]
【課題を解決するための手段】本発明に係わる水中平行
板遮音構造は、水路を流れる流水中に設けられこの流水
中を伝搬する騒音を遮音する水中遮音構造において、遮
音したい騒音の水中での波長の上限をλ，中心波長をλ
1 とした場合、その表面に水より音響的に軟らかい吸音
性弾性部材を設けた、長さＬ≧λ1 とする平行板を、間
隔ｗ≦λ／２で流水方向に平行に複数配置した構成を特
徴とする。なお、水より音響的に軟らかいとは、水のρ
ｃ（固有音響インピーダンス：密度ρと音速ｃとの積）
より小さいρｃを持っていることを言い、従って水中を
伝播する騒音や乱流で発生したノイズを流水中で、入射
端面での反射および機構内部での吸音によって、遮音す
ることができるようになる。An underwater parallel plate sound insulation structure according to the present invention is provided in a flowing water flowing through a water channel, and in an underwater sound insulation structure for isolating noise propagating in the flowing water, the underwater sound insulation structure is used for the sound to be isolated. The upper limit of the wavelength is λ and the center wavelength is λ
When 1 is set, a plurality of parallel plates having a length L ≧ λ 1 and a plurality of parallel plates having a length L ≧ λ 1 are arranged in parallel with the flowing water direction at intervals of w ≦ λ / 2. It is characterized by. In addition, it is ρ of water that it is acoustically softer than water.
c (specific acoustic impedance: product of density ρ and sound velocity c)
It means that it has a smaller ρc, so that noise that propagates in water or noise generated by turbulence can be shielded in flowing water by reflection at the incident end face and sound absorption inside the mechanism. .
【０００７】また上記水中平行板遮音構造を備えた、船
舶のプロペラなどの計測に使用する回流水槽を特徴とす
る。従って本発明の回流水槽は、上述の流体雑音のよう
な被計測対象が発生する小さな雑音の計測が可能とな
る。Another feature of the present invention is a circulating water tank provided with the above-described underwater parallel plate sound insulation structure and used for measuring a propeller or the like of a ship. Therefore, the circulating water tank of the present invention can measure small noise generated by the object to be measured, such as the fluid noise described above.
【０００８】[0008]
【発明の実施の形態】以下、本発明の実施の形態を図面
を用いて説明する。図１，図２は本発明の平行板を用い
た水中平行板遮音構造を説明するための図であり、例え
ば図３に示す回流水槽においては、整流部１１のような
流水中で、整流板（図示せず）に替えて使用される。図
１，図２に示すように本発明の平行板遮音構造２００
は、流水中に設置してこの流水を伝搬する騒音を遮音す
るものであり、所定間隔ｗで配設された複数の平行板２
０１で構成され、各平行板２０１は鉄板などの芯板２１
１の表裏面にゴム等の水より音響的に軟らかい吸音性弾
性部材２１２を設けてなる。Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 are diagrams for explaining an underwater parallel plate sound insulation structure using the parallel plate of the present invention. For example, in the circulating water tank shown in FIG. (Not shown). As shown in FIGS. 1 and 2, the parallel plate sound insulation structure 200 of the present invention
Is installed in running water to block noise propagating in the running water, and includes a plurality of parallel plates 2 arranged at a predetermined interval w.
01, each parallel plate 201 is a core plate 21 such as an iron plate.
1 is provided with a sound absorbing elastic member 212 which is acoustically softer than water such as rubber on the front and back surfaces.
【０００９】この平行板遮音構造２００を整流部１１に
設ける場合、整流部１１の壁面から伝達される振動は吸
音性弾性部材２１２の制振作用により抑制されるが、壁
面振動が異常に大きい場合には既知の適当な防振構造を
介在させる必要がある。また、各平行板２０１は図２に
示すように通常横板２０２を用いて所定間隔ｗに保持さ
れ、すなわち横板２０２を平行板２０１と直角で且つ流
水方向に平行になるように取付け、この横板２０２で各
平行板２０１を固定，補強している。横板２０２の取付
け間隔は特に制限はないが、平行板２０１と同じ構造と
することにより吸音効果をより高めることができるよう
になる。また、図２に示すように平行板２０１および横
板２０２の端部は、流水の乱れを発生させないように流
線形状としている。When the parallel plate sound-insulating structure 200 is provided in the rectifying section 11, the vibration transmitted from the wall of the rectifying section 11 is suppressed by the damping action of the sound absorbing elastic member 212, but when the wall vibration is abnormally large. Requires an appropriate known vibration isolating structure. Each parallel plate 201 is normally held at a predetermined interval w using a horizontal plate 202 as shown in FIG. 2, that is, the horizontal plate 202 is mounted so as to be perpendicular to the parallel plate 201 and parallel to the flowing water direction. Each parallel plate 201 is fixed and reinforced by a horizontal plate 202. The mounting interval of the horizontal plate 202 is not particularly limited, but the same structure as the parallel plate 201 can further enhance the sound absorbing effect. Further, as shown in FIG. 2, the ends of the parallel plate 201 and the horizontal plate 202 are formed in a streamline shape so as not to cause disturbance of the flowing water.
【００１０】周知のようにその表面が音響的に軟らか
い、吸音効果を有する弾性部材２１２で覆われた平行板
２０１の間を水が流れている場合、水中での音の波長を
λとすると、その平行板２０１の間隔ｗが、λ＞２ｗ
ならば流水を伝播する音波は吸音性弾性部材２１２に吸
音されてしまう。すなわち間隔ｗ＝２５ｃｍとした場
合、遮断周波数３ｋＨｚ以下の音波は吸音性弾性部材２
１２に吸音され、この平行板遮音機構２００を伝搬しな
くなる。また平行板２０１の長さＬは、長ければその吸
音効果が大きく、特に騒音の中心波長λ1 以上の長さ
（Ｌ≧λ1 ）にするとその効果は大きい。従ってｗ＝２
５ｃｍ，Ｌ＝１．５ｍとすれば、吸音周波数範囲は１〜
３ｋＨｚとなる。As is well known, when water flows between the parallel plates 201 covered with an elastic member 212 having an acoustically soft surface and having a sound absorbing effect, the wavelength of sound in water is λ. When the distance w between the parallel plates 201 is λ> 2w
Then, the sound wave propagating in the flowing water is absorbed by the sound absorbing elastic member 212. That is, when the interval w is set to 25 cm, sound waves having a cut-off frequency of 3 kHz or less pass through the sound absorbing elastic member 2.
The sound is absorbed by the transmission plate 12 and does not propagate through the parallel plate sound insulation mechanism 200. The length L of the parallel plate 201 has a larger its sound absorption effect Longer, its effect is significant especially to center wavelength lambda 1 or more of the length of the noise (L ≧ λ 1). Therefore, w = 2
If 5 cm and L = 1.5 m, the sound absorption frequency range is 1 to
3 kHz.
【００１１】現在、一般に使用されている他の方法（例
えば吸音くさびを取り付ける方法）を用いた水中吸音材
の吸音周波数範囲は約５ｋＨｚ以上であり、低周波ノイ
ズを遮音する必要があるこの種の回流水槽の遮音には十
分でなかったが、この平行板遮音構造２００を用いるこ
とにより効果的な遮音効果が得られるようになった。ま
た、この平行板遮音構造２００に入射する騒音は、図１
の２１３の入射部端面において水と遮音機構のρｃ不整
合によってその一部が反射され、平行板遮音構造２００
内には入射しないので、ここでも遮音効果が得られると
共に、水が平行板遮音構造２００を流れることにより整
流されるため、この平行板遮音構造２００で遮音と整流
との両方の効果が得られることになる。The sound absorption frequency range of underwater sound-absorbing materials using other methods commonly used at present (for example, a method of attaching a sound-absorbing wedge) is about 5 kHz or more. Although the sound insulation of the circulating water tank was not sufficient, the use of this parallel plate sound insulation structure 200 enabled an effective sound insulation effect to be obtained. The noise incident on the parallel plate sound insulation structure 200 is shown in FIG.
213 is partially reflected by the water and the ρc mismatch between the sound insulation mechanism and the parallel plate sound insulation structure 200.
Since the light does not enter the inside, the sound insulation effect is obtained here as well, and since the water is rectified by flowing through the parallel plate sound insulation structure 200, both the sound insulation and the rectification effect are obtained with the parallel plate sound insulation structure 200. Will be.
【００１２】なお上記実施形態では、回流水槽に設置す
る場合について説明しているが、水中（他の液体中を含
む）を伝搬する騒音を水中で遮音する必要がある場合の
全てに実施できることは言うまでもない。In the above-described embodiment, the case where the apparatus is installed in the circulating water tank is described. However, the present invention can be applied to all cases where noise propagating in water (including other liquids) needs to be isolated in water. Needless to say.
【００１３】[0013]
【発明の効果】以上説明したように本発明の水中平行板
遮音構造は、従来困難であった低周波ノイズの遮音が容
易に行える。また、水が平行板を流れることにより整流
されるため、遮音と整流との両方の効果が同時に得られ
ることになる。従って船舶のプロペラなどの計測に使用
する回流水槽に用いれば、従来の整流板に替えて使用す
ることができ、例えばプロペラ静止時に発生するような
小さな流体雑音の計測が可能になる等の効果がある。As described above, the underwater parallel plate sound insulation structure of the present invention can easily perform sound insulation of low frequency noise, which has been difficult in the past. In addition, since water is rectified by flowing through the parallel plate, both effects of sound insulation and rectification can be obtained at the same time. Therefore, if it is used in a circulating water tank used for measurement of a propeller of a ship, it can be used in place of a conventional straightening vane, and for example, it is possible to measure small fluid noise generated when the propeller is stationary. is there.
【図１】本発明の水中平行板遮音構造の一実施形態を示
す図である。FIG. 1 is a diagram showing one embodiment of an underwater parallel plate sound insulation structure of the present invention.
【図２】図１に示す平行板遮音構造の構成例を示す図で
ある。FIG. 2 is a diagram showing a configuration example of a parallel plate sound insulation structure shown in FIG.
【図３】従来のこの種の回流水槽を説明するための図で
ある。FIG. 3 is a diagram for explaining this kind of conventional circulating water tank.
１ 回流管 ２ 送水装置 ３ 計測部 １０ 送水部 １１ 整流部 １２ エルボ部 １３ 吸水部 ２００ 平行板遮音構造 ２０１ 平行板 ２０２ 横板 ２１１ 芯板 ２１２ 吸音性弾性部材 ２１３ 入射部 Reference Signs List 1 circulation pipe 2 water supply device 3 measuring unit 10 water supply unit 11 rectifying unit 12 elbow unit 13 water absorption unit 200 parallel plate sound insulation structure 201 parallel plate 202 horizontal plate 211 core plate 212 sound absorbing elastic member 213 entrance unit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中村 薫 神奈川県横浜市戸塚区俣野町1403，ドリ ームハイツ14−701 (72)発明者 高嶋 睦男 神奈川県横浜市瀬谷区北新３−30 (56)参考文献 特開 平10−10000（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kaoru Nakamura 1403, Matano-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture, 14-701 Dream Heights (72) Inventor Mutsuo Takashima 3-30 Kitashin, Seya-ku, Yokohama-shi, Kanagawa (56) Reference Document JP-A-10-10000 (JP, A)
Claims (2)
中を伝搬する騒音を遮音する水中遮音構造において、 遮音したい騒音の水中での波長の上限をλ，中心波長を
λ1 とした場合、その表面に水より音響的に軟らかい吸
音性弾性部材を設けた、長さＬ≧λ1 とする平行板を、
間隔ｗ≦λ／２で流水方向に平行に複数配置した構成を
特徴とする水中平行板遮音構造。1. A water sound insulation structure for sound insulation noise propagating through the running water is provided in flowing water flowing through the water channel, the upper limit of the wavelength in water of the noise to be sound insulation lambda, if the center wavelength is lambda 1, A parallel plate with a length L ≧ λ 1 having a sound absorbing elastic member softer than water on its surface,
An underwater parallel plate sound insulation structure characterized by a plurality of arrangements arranged in parallel with the direction of flowing water at an interval w ≦ λ / 2.
構造を備えたことを特徴とする船舶のプロペラなどの計
測に使用する回流水槽。2. A circulating water tank for measuring a propeller or the like of a ship, comprising the underwater parallel plate sound insulation structure according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09038636A JP3107367B2 (en) | 1997-02-07 | 1997-02-07 | Underwater parallel plate sound insulation structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09038636A JP3107367B2 (en) | 1997-02-07 | 1997-02-07 | Underwater parallel plate sound insulation structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10221204A JPH10221204A (en) | 1998-08-21 |
| JP3107367B2 true JP3107367B2 (en) | 2000-11-06 |
Family
ID=12530739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09038636A Expired - Lifetime JP3107367B2 (en) | 1997-02-07 | 1997-02-07 | Underwater parallel plate sound insulation structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3107367B2 (en) |
-
1997
- 1997-02-07 JP JP09038636A patent/JP3107367B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10221204A (en) | 1998-08-21 |
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