JPS6239931B2 - - Google Patents
Info
- Publication number
- JPS6239931B2 JPS6239931B2 JP5035881A JP5035881A JPS6239931B2 JP S6239931 B2 JPS6239931 B2 JP S6239931B2 JP 5035881 A JP5035881 A JP 5035881A JP 5035881 A JP5035881 A JP 5035881A JP S6239931 B2 JPS6239931 B2 JP S6239931B2
- Authority
- JP
- Japan
- Prior art keywords
- water level
- test
- water
- tank
- fluid
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 239000012530 fluid Substances 0.000 claims description 13
- 230000003068 static effect Effects 0.000 claims description 11
- 230000007423 decrease Effects 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003449 preventive effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Description
【発明の詳細な説明】
本発明は、船舶、海洋構造物等の各種試験を行
う試験水槽の静振防止装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a static vibration prevention device for a test tank in which various tests are conducted on ships, marine structures, etc.
船舶、海洋構造物等の試験水槽では、種々の原
因により、水面に静振と呼ばれる長周期（１周期
数10秒）の振動が生ずることが広く知られてい
る。この静振は船型試験等の試験精度に悪影響を
及ぼすので何等かの防止策が必要であるが、現状
では積極的な対策は施されていない。 It is widely known that in test tanks for ships, offshore structures, etc., long-period (10 seconds per period) vibrations called static vibrations occur on the water surface due to various causes. This static vibration has a negative effect on the accuracy of tests such as hull form tests, so some kind of preventive measures are necessary, but currently no active measures have been taken.
本発明は以上に鑑み、静振を抑止し、またはそ
の発達を少なくし得る装置を提供するためになし
たもので、試験水槽の一端側水位を検出する水位
計と、試験水槽の他端側に位置し且つ容積を流体
により変え得るようにした密閉容器と、前記水位
計により検出した水位変化に比例して前記容器内
の流体量を増減する流体制御装置を備えたことを
特徴とするものである。 In view of the above, the present invention has been made to provide a device capable of suppressing static vibration or reducing its development. An airtight container located in the container whose volume can be changed by fluid, and a fluid control device that increases or decreases the amount of fluid in the container in proportion to the change in water level detected by the water level gauge. It is.
このため、試験水槽に静振が生じ、該試験水槽
の一端側に設けた水位計がこれを検出すると、流
体制御装置により前記試験水槽の他端側に設置し
た容器内の流体量が、前記水位計の検出した水位
変化に比例して増減され、これにより前記試験水
槽両端に180℃位相の異なる２つの波が同時に発
生し、両波が互いに減衰し合う。 Therefore, when static vibration occurs in the test tank and the water level gauge installed at one end of the test tank detects this, the fluid control device controls the amount of fluid in the container installed at the other end of the test tank. The water level is increased or decreased in proportion to the change in the water level detected by the water level gauge, and as a result, two waves with a 180°C phase difference are simultaneously generated at both ends of the test tank, and both waves attenuate each other.
以下本発明の実施例を図面により説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図に示すように、試験水槽１の一端側水面
下に容積可変な流体容器、例えば袋２を配設して
いる。該袋２には流量制御弁３を備えた導管４を
接続し、該導管４には両端側に開閉弁５，６，
８，９を備えた２本の導管７，１０の一端を接続
し、該２本の導管７，１０の他端には一端を水中
で開口せしめた導管１１を接続し、前記導管７，
１０の中間側を導管１２で連絡し、該導管１２の
途中にポンプ１３を配設している。 As shown in FIG. 1, a fluid container having a variable volume, such as a bag 2, is disposed below the water surface at one end of the test water tank 1. A conduit 4 equipped with a flow control valve 3 is connected to the bag 2, and the conduit 4 has on-off valves 5, 6,
One end of two conduits 7, 10 having pipes 8, 9 are connected, and a conduit 11 with one end opened underwater is connected to the other end of the two conduits 7, 10.
10 are connected to each other by a conduit 12, and a pump 13 is disposed in the middle of the conduit 12.
又試験水槽１の他端側水位を計測する水位計１
４と、該水位計１４よりの信号を増幅するアンプ
１５と、該アンプ１５からの信号に基づきポンプ
１３，開閉弁５，６，８，９及び流量制御弁３に
所定の制御信号を発するコントロールボツクス１
６を備えている。 Also, a water level gauge 1 for measuring the water level at the other end of the test water tank 1.
4, an amplifier 15 that amplifies the signal from the water level gauge 14, and a control that issues a predetermined control signal to the pump 13, the on-off valves 5, 6, 8, and 9, and the flow rate control valve 3 based on the signal from the amplifier 15. box 1
It is equipped with 6.
以上において袋２は試験水槽１の奥行き（図面
に対し直交する方向の長さ）と略同一長さに製作
することが望ましい。又導管１１の水中開口側端
部は袋２から遠く離れたところに位置せしめるよ
うにするか、または水槽外に設けた別個の貯水タ
ンク内に接続することが望ましい。 In the above, it is desirable that the bag 2 be manufactured to have approximately the same length as the depth of the test water tank 1 (the length in the direction perpendicular to the drawing). It is also preferable that the underwater opening end of the conduit 11 be located far away from the bag 2, or connected to a separate water storage tank provided outside the aquarium.
第２図は静振の状態を示すもので、イは水位計
１４が最高水位を検出したときの水面を示し、又
ロは最低水位を検出したときの水面、ｈは振幅を
示している。 FIG. 2 shows the state of static vibration, where A shows the water level when the water level gauge 14 detects the highest water level, B shows the water level when the lowest water level is detected, and h shows the amplitude.
いま水位計１４が第３図Ａに示すように、例え
ば１周期60秒の静振を検出した場合は、これに伴
ない袋２の容積を第３図Ｂのように変化せしめ
る。即ち、水位計１４により検出した水位変化に
比例して袋２の容積を増減せしめる。袋２の容積
をこのように変化せしめるためには、ポンプ１
３，開閉弁５，６，８，９及び流量制御弁３を次
のように作動する。即ち、導管１２内の水の流れ
がａ方向となるようポンプ１３を作動せしめてお
き、袋２の容積を増大するときは、開閉弁５，９
を閉、開閉弁６，８を開とし、袋２の容積を減少
するときは、開閉弁５，９を開、開閉弁６，８を
閉とする。開閉弁５，９を閉、開閉弁６，８を開
とすると、試験水槽１の水Ｗはポンプ１３の働ら
きにより、導管１１，開閉弁８，ポンプ１３，開
閉弁６，導管４を経て袋２に流入する。開閉弁
５，９を開、開閉弁６，８を閉とすると、袋２内
の水はポンプ１３の働らきにより開閉弁９，ポン
プ１３，開閉弁５，導管１１を経由して試験水槽
１内に戻る。以上の開閉弁の切換え作動と併せて
流量制御弁３の開度を調節し、第３図Ｃに示すよ
うな流量変化が生じるようにすると、試験水槽１
の両端に位相の180゜異なつた２つの波が同時に
発生し、該２つの波が互いに減衰し合うよう働ら
く。 If the water level gauge 14 detects, for example, static vibration with one cycle of 60 seconds as shown in FIG. 3A, the volume of the bag 2 is accordingly changed as shown in FIG. 3B. That is, the volume of the bag 2 is increased or decreased in proportion to the change in water level detected by the water level gauge 14. In order to change the volume of bag 2 in this way, pump 1
3. Operate the on-off valves 5, 6, 8, 9 and the flow rate control valve 3 as follows. That is, the pump 13 is operated so that the water in the conduit 12 flows in the direction a, and when the volume of the bag 2 is increased, the on-off valves 5 and 9 are operated.
is closed and the on-off valves 6 and 8 are opened. When reducing the volume of the bag 2, the on-off valves 5 and 9 are opened and the on-off valves 6 and 8 are closed. When the on-off valves 5 and 9 are closed and the on-off valves 6 and 8 are opened, water W in the test tank 1 passes through the conduit 11, the on-off valve 8, the pump 13, the on-off valve 6, and the conduit 4 due to the action of the pump 13. It flows into bag 2. When the on-off valves 5 and 9 are opened and the on-off valves 6 and 8 are closed, the water in the bag 2 flows through the on-off valve 9, the pump 13, the on-off valve 5, and the conduit 11 to the test water tank 1 due to the action of the pump 13. Go back inside. When the opening degree of the flow rate control valve 3 is adjusted in conjunction with the above switching operation of the on-off valve, and the flow rate changes as shown in FIG. 3C occur, the test water tank 1
Two waves with a phase difference of 180 degrees are simultaneously generated at both ends of the waveform, and the two waves act to attenuate each other.
以上は一実施例として、管路の弁を切換えるこ
とによつて流れ方向を変換しているが、要は袋２
内に流体を出し入れする機構を有すればよく、流
入および排出の二系統のポンプを設けても全く同
じ効果がある。 The above is an example in which the flow direction is changed by switching the valve of the pipe line, but the point is that the flow direction is changed by changing the valve of the pipe line.
It is sufficient to have a mechanism for taking fluid in and out, and the same effect can be obtained even if two systems of pumps, one for inflow and one for discharge, are provided.
以上の開閉弁及び流量制御弁の制御はコントロ
ールボツクスからの制御信号により行なう。 The above opening/closing valves and flow control valves are controlled by control signals from a control box.
なお、以上の実施例では袋２に試験水槽の水を
入れるようにしたが、水の代りにエアを袋に入れ
るようにすることも可能である。 In the above embodiment, the bag 2 is filled with water from the test tank, but it is also possible to fill the bag with air instead of water.
本発明によれば試験水槽の一端側に設けた容器
の容積（体積）を水槽他端側の水位変化に比例し
て増減する構成を有し、このため試験水槽の両端
に位相が180゜異なる２つの波が同時に発生し、
両波が互いに減衰し合うよう働らくので、静振を
抑止し、またはその発達を少なくする効果があ
る。 According to the present invention, the volume of the container provided at one end of the test tank is increased or decreased in proportion to the change in the water level at the other end of the test tank, and therefore the phase differs by 180° at both ends of the test tank. Two waves occur at the same time,
Since both waves work to attenuate each other, it has the effect of suppressing static vibration or reducing its development.
第１図は本発明の一実施例を示す説明図、第２
図は試験水槽に発生した静振の説明図、第３図Ａ
は静振の振幅を示す線図、第３図Ｂは流体容器の
容積変化を示す線図、第３図Ｃは流体容器に出し
入れする流体の流量変化を示す線図である。
１……試験水槽、２……袋、３……流量制御
弁、５，６，８，９……開閉弁、１３……ポン
プ、１４……水位計。
FIG. 1 is an explanatory diagram showing one embodiment of the present invention, and FIG.
The figure is an explanatory diagram of the static vibration that occurred in the test tank, Figure 3A
3B is a diagram showing the amplitude of static vibration, FIG. 3B is a diagram showing changes in the volume of the fluid container, and FIG. 3C is a diagram showing changes in the flow rate of fluid taken in and out of the fluid container. 1...Test water tank, 2...Bag, 3...Flow rate control valve, 5, 6, 8, 9...Opening/closing valve, 13...Pump, 14...Water level gauge.
Claims (1)
試験水槽の他端側に位置し且つ容積を流体により
変え得るようにした密閉容器と、前記水位計によ
り検出した水位変化に比例して前記容器内の流体
量を増減する流体制御装置を備えたことを特徴と
する試験水槽の静振防止装置。1 A water level gauge that detects the water level at one end of the test tank;
A closed container located at the other end of the test water tank and whose volume can be changed by fluid, and a fluid control device that increases or decreases the amount of fluid in the container in proportion to the change in water level detected by the water level gauge. A static vibration prevention device for a test water tank, which is characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5035881A JPS57165733A (en) | 1981-04-03 | 1981-04-03 | Apparatus for preventing slow vibration of test water tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5035881A JPS57165733A (en) | 1981-04-03 | 1981-04-03 | Apparatus for preventing slow vibration of test water tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57165733A JPS57165733A (en) | 1982-10-12 |
| JPS6239931B2 true JPS6239931B2 (en) | 1987-08-26 |
Family
ID=12856665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5035881A Granted JPS57165733A (en) | 1981-04-03 | 1981-04-03 | Apparatus for preventing slow vibration of test water tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57165733A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6475931A (en) * | 1987-09-18 | 1989-03-22 | Ohbayashi Corp | Vibration tester for underwater structure |
| CN112498607B (en) * | 2020-11-18 | 2022-06-21 | 哈尔滨工程大学 | A simple test device for low-noise flow-induced vibration and noise |
-
1981
- 1981-04-03 JP JP5035881A patent/JPS57165733A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57165733A (en) | 1982-10-12 |
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