JPH0712560A - Hull rolling-and-pitching detection apparatus - Google Patents
Hull rolling-and-pitching detection apparatusInfo
- Publication number
- JPH0712560A JPH0712560A JP17614793A JP17614793A JPH0712560A JP H0712560 A JPH0712560 A JP H0712560A JP 17614793 A JP17614793 A JP 17614793A JP 17614793 A JP17614793 A JP 17614793A JP H0712560 A JPH0712560 A JP H0712560A
- Authority
- JP
- Japan
- Prior art keywords
- fluid
- thermometer
- vertical
- hull
- pressure gauge
- 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.)
- Withdrawn
Links
Landscapes
- Measuring Arrangements Characterized By The Use Of Fluids (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、船舶の動揺検出装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motion detection device for a ship.
【０００２】[0002]
【従来の技術】例えば、水中翼付高速客艇では、船体の
動揺を低減するために、船体動揺を検出し、これを小さ
くするように水中翼フラップを制御している。この船体
動揺は、従来、図６ブロック図に示すように、船体６の
上下加速度を加速度検出器１１により検出し、これを積
分器１２で２階積分し演算装置９にて変位に変化して制
御信号にしている。2. Description of the Related Art For example, in a high-speed passenger boat with hydrofoils, in order to reduce the shaking of the hull, the shaking of the hull is detected and the hydrofoil flap is controlled so as to reduce it. As shown in the block diagram of FIG. 6, the vertical motion of the hull 6 is conventionally detected by the acceleration detector 11, the integrator 12 integrates the second acceleration, and the computing device 9 changes the displacement into displacement. It is a control signal.
【０００３】[0003]
【発明が解決しようとする課題】ところで、水中翼船等
の高速客艇では、推進用主機が高馬力になるので、振動
励振力も大きくなり、船体振動が大きくなる。また、船
速が速く波浪衝撃も大きくなる。そこで、動揺検出用加
速度検出器はこれらの加速度成分も感知するため計測レ
ンジを大きくする必要がある。一方、制御対象となる船
体動揺は変位としては前記成分より大きいものの、周波
数域が極端に低く、加速度としては小さな値になる。こ
のためＳ／Ｎ比が悪化し、加速度検出器，アンプを含め
た計測系のドリフトの影響が大きくなり十分な制御性能
が得られないという問題がある。By the way, in a high-speed passenger boat such as a hydrofoil, the main propulsion engine has a high horsepower, so that the vibration excitation force becomes large and the hull vibration becomes large. In addition, the ship speed is high and the wave impact is large. Therefore, the acceleration detector for motion detection needs to increase the measurement range because it also senses these acceleration components. On the other hand, the motion of the ship to be controlled is larger than the above component as displacement, but the frequency range is extremely low, and the value of acceleration is small. As a result, the S / N ratio deteriorates, the influence of the drift of the measurement system including the acceleration detector and the amplifier becomes large, and sufficient control performance cannot be obtained.
【０００４】本発明はこのような事情に鑑みて提案され
たもので、Ｓ／Ｎ比を大きくし、計測系のドリフトの影
響の少ない高精度の船体動揺検出装置を提供することを
目的とする。The present invention has been proposed in view of such circumstances, and an object of the present invention is to provide a highly accurate ship motion detection apparatus which has a large S / N ratio and is less affected by the drift of the measurement system. .
【０００５】[0005]
【課題を解決するための手段】そのために請求項１の発
明は、同一断面積を有する左右１対の上端閉塞竪管の下
端部を比較的大断面で比較的短い横方向連通管にて連通
し、上記竪管及び上記連通管に流体を封入し、上記各竪
管の上端部にそれぞれ密閉空気室を形成してなるＵ字管
において、上記密閉空気室の一方にそれぞれ配設された
温度計及び圧力計と、上記温度計及び圧力計の出力に基
づいて上記流体の上面の振動変位を演算する演算器とを
具えたことを特徴とする。To this end, according to the invention of claim 1, the lower end portions of a pair of left and right upper end blocking vertical pipes having the same cross-sectional area are connected by a lateral communication pipe having a relatively large cross-section and a relatively short length. Then, in a U-shaped tube in which a fluid is sealed in the vertical pipe and the communication pipe, and a closed air chamber is formed at the upper end of each vertical pipe, the temperature of each of the closed air chambers is set. And a calculator for calculating the vibration displacement of the upper surface of the fluid based on the outputs of the thermometer and the pressure gauge.
【０００６】また、請求項２の発明は、同一断面積を有
する左右１対の上端閉塞竪管の下端部を比較的大断面で
比較的長い横方向連通管にて連通し、上記各竪管及び連
通管に流体を封入し、上記各竪管の上端部にそれぞれ密
閉空気室を形成してなるＵ字管において、上記密閉空気
室の一方にそれぞれ配設された温度計及び圧力計と、上
記温度計及び圧力計の出力に基づいて上記流体の上面の
振動変位を演算する演算器とを具えたことを特徴とす
る。Further, according to the invention of claim 2, the pair of left and right upper end closed vertical pipes having the same cross-sectional area are connected at their lower end portions by a lateral communication pipe having a relatively large cross section and a relatively long length. And a U-shaped tube in which a fluid is enclosed in the communication tube and a closed air chamber is formed at the upper end of each vertical tube, and a thermometer and a pressure gauge respectively disposed in one of the closed air chambers, And a calculator for calculating the vibration displacement of the upper surface of the fluid based on the outputs of the thermometer and the pressure gauge.
【０００７】[0007]
【作用】このような構成によれば、空気室の鉛直方向長
さをｈ，体積をＶ，断面積をＡ，圧力をＰ，温度をＴと
すると式（１）が成立する。 Ｖ＝Ａ・ｈ＝ｎＲＴ／Ｐ・・・・・・（１） ここで、ｎ：空気室分子のモル数，Ｒ：アボガドロ定数 さらに、式（１）は式（２）のように変形できる。 ｈ＝（ｎＲ／Ａ）・（Ｔ／Ｐ）＝Ｇ・（Ｔ／Ｐ）・・・・・・（２） Ｇ＝ｎＲ／Ａ ここで、Ｇ：ゲイン したがって、流体の水線の変動量として検出される船体
動揺を空気室の圧力の変動量として圧力Ｐ，温度Ｔ及び
ゲインＧにより求めることができる。According to this structure, the equation (1) is established when the vertical length of the air chamber is h, the volume is V, the cross-sectional area is A, the pressure is P, and the temperature is T. V = A · h = nRT / P (1) where n: number of moles of air chamber molecules, R: Avogadro's constant Furthermore, equation (1) can be transformed into equation (2). . h = (nR / A) · (T / P) = G · (T / P) ··· (2) G = nR / A where G: gain Therefore, the amount of fluctuation of the fluid water line The hull motion detected as is calculated as the amount of fluctuation of the pressure in the air chamber by the pressure P, the temperature T and the gain G.
【０００８】[0008]
【実施例】本発明の一実施例を図面について説明する
と、図１は本発明を高速客艇の上下変位検出に適用した
第１実施例を示す縦断面図、図２は本発明を高速客艇の
水平変位検出に適用した第２実施例を示す縦断面図、図
３は高速客艇の船体振動加速度応答を示す線図、図４は
本発明装置の伝達特性を示す線図、図５は本発明装置に
より検出される船体動揺を示す線図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a first embodiment in which the present invention is applied to detection of vertical displacement of a high-speed passenger boat, and FIG. 5 is a longitudinal sectional view showing a second embodiment applied to horizontal displacement detection of a boat, FIG. 3 is a diagram showing a hull vibration acceleration response of a high-speed passenger boat, FIG. 4 is a diagram showing transfer characteristics of the device of the present invention, FIG. [Fig. 3] is a diagram showing a ship motion detected by the device of the present invention.
【０００９】まず、図１に示す第１実施例の上下動揺検
出装置は、船体６の上に流体４と空気室５ａ，５ｂから
なる竪管３ａ，３ｂを有するＵ字管を設置する。空気室
５ａ，５ｂには温度計７と圧力計８が設置され、それぞ
れ演算装置９につながれている。ここで両竪管３ａ，３
ｂは流体が上下振動を行い安くするために水位差を設
け、その分の質量が慣性力によって上下振動するよう
に、その長さを異にしている。First, in the vertical motion detecting apparatus of the first embodiment shown in FIG. 1, a U-shaped tube having vertical tubes 3a and 3b composed of a fluid 4 and air chambers 5a and 5b is installed on a hull 6. A thermometer 7 and a pressure gauge 8 are installed in the air chambers 5a and 5b, and are connected to a computing device 9, respectively. Here, both vertical tubes 3a, 3
b has a water level difference in order to make the fluid vibrate vertically and reduce the cost, and has different lengths so that the mass of the fluid vibrates vertically due to inertial force.
【００１０】このような装置において、船体動揺により
竪管３ａ，３ｂの水位差分だけの流体が動く。このと
き、空気室の圧力の変化を圧力計８が検出し、検出信号
を演算装置９に送る。演算装置９では式（２）にしたが
って、流体の変位を演算し、比例定数をかけることによ
って船体動揺信号を検出する。In such an apparatus, the fluid is moved by the water level difference between the vertical pipes 3a and 3b due to the motion of the hull. At this time, the pressure gauge 8 detects a change in the pressure of the air chamber and sends a detection signal to the arithmetic unit 9. The computing device 9 computes the displacement of the fluid according to the equation (2) and multiplies the constant of proportionality to detect the ship motion signal.
【００１１】一般的に船体の振動には、図３に示すよう
に、船体動揺による成分（Ａ）と、推進機関等により励
振された成分（Ｃ）が含まれ、加速度振幅としては、前
者（Ａ）よりも後者（Ｃ）がはるかに大きい。したがっ
て、このような加速度を２回積分することによって得ら
れた変位信号は成分（Ｃ）の量が大きく現れ、成分
（Ａ）の量が誤差の範囲になる可能性がある。Generally, as shown in FIG. 3, the vibration of the hull includes a component (A) due to the motion of the hull and a component (C) excited by a propulsion engine or the like. The latter (C) is much larger than A). Therefore, the displacement signal obtained by integrating such acceleration twice has a large amount of the component (C), and the amount of the component (A) may fall within the error range.
【００１２】しかしながら、図１に示す本発明装置によ
れば、図４に示すように、ｙは船体振幅，Δｈは水位の
変動量を示し、ω0 は本装置の固有振動数であり、ω0
以上の周波数域の成分は伝達しにくくなる。これにより
ω0 以下の周波数域の成分は非常にフラットな特性をも
つ。なお、本装置の固有振動数は（Ａ）成分より上であ
まり振動成分のない領域、例えば図３の成分（Ｂ）の領
域にあわせる。したがって、本装置による検出信号は図
３に図４が乗算されたような形となり、図５に示すよう
になる。このように、ω0 における信号は少し拡大され
るものの、ω0 以上の成分はほとんどカットされ、ω0
以下の成分はある一定のゲインで検出することができ
る。すなわち、本装置の固有振動数を船体動揺周波数と
推進機関等による励振周波数の間に設定することによ
り、船体動揺成分のみを検知することができる。However, according to the device of the present invention shown in FIG. 1, as shown in FIG. 4, y is the hull amplitude, Δh is the fluctuation amount of the water level, ω 0 is the natural frequency of the device, and ω 0
It becomes difficult to transmit the components in the above frequency range. As a result, the frequency component below ω 0 has a very flat characteristic. The natural frequency of this device is adjusted to a region above the component (A) and having little vibration component, for example, the region of the component (B) in FIG. Therefore, the detection signal by this device has a form as shown in FIG. 3 multiplied by FIG. 4, and becomes as shown in FIG. In this way, although the signal at ω 0 is slightly enlarged, components above ω 0 are almost cut, and ω 0
The following components can be detected with a certain gain. That is, by setting the natural frequency of the present device between the hull sway frequency and the excitation frequency by the propulsion engine or the like, only the hull sway component can be detected.
【００１３】次に、図２に示す第２実施例では、図１の
第１実施例において、竪管３ａ，３ｂを同一高さのもの
３ａ′，３ｂ′とするとともに、両竪管３ａ′，３ｂ′
の下端部同士を竪管の断面と同一断面の横管１０で連通
した構造を採っている。Next, in a second embodiment shown in FIG. 2, the vertical tubes 3a and 3b in the first embodiment of FIG. 1 are made to have the same height 3a 'and 3b', and both vertical tubes 3a 'are provided. , 3b '
Has a structure in which the lower end portions of are connected by a horizontal pipe 10 having the same cross section as the cross section of the vertical pipe.
【００１４】このような構造によれば、船舶の水平動揺
の際に、横管１０の大きさに相当する流体が動くことに
よって、第１実施例と同一原理に基づいて、船体の水平
変位を検出することができる。According to such a structure, when the ship horizontally sways, the fluid corresponding to the size of the lateral pipe 10 moves, so that the horizontal displacement of the hull can be performed based on the same principle as that of the first embodiment. Can be detected.
【００１５】[0015]
【発明の効果】上記両実施例を通して述べたように、本
装置によれば、船体動揺を精度よく検出できるため、こ
れと水中翼フラップの制御効果により、動揺の少ない客
艇を提供できる。As described in the above embodiments, according to the present apparatus, the motion of the ship can be detected with high accuracy, and the effect of this and the control effect of the hydrofoil flap can provide a passenger boat with less motion.
【００１６】要するに、請求項１の発明によれば、同一
断面積を有する左右１対の上端閉塞竪管の下端部を比較
的大断面で比較的短い横方向連通管にて連通し、上記竪
管及び上記連通管に流体を封入し、上記各竪管の上端部
にそれぞれ密閉空気室を形成してなるＵ字管において、
上記密閉空気室の一方にそれぞれ配設された温度計及び
圧力計と、上記温度計及び圧力計の出力に基づいて上記
流体の上面の振動変位を演算する演算器とを具えたこと
により、Ｓ／Ｎ比を大きくし、計測系のドリフトつまり
計測器のゼロ点のずれの影響の少ない高精度の船舶の上
下変位検出装置を得るから、本発明は産業上極めて有益
なものである。In summary, according to the first aspect of the invention, the lower end portions of the pair of left and right upper end blocking vertical pipes having the same cross-sectional area are communicated with each other by the lateral communication pipe having a relatively large cross section and a relatively short length, and In a U-shaped pipe in which a fluid is enclosed in the pipe and the communication pipe, and a closed air chamber is formed at the upper end of each vertical pipe,
By including a thermometer and a pressure gauge respectively disposed in one of the closed air chambers, and a calculator for calculating the vibration displacement of the upper surface of the fluid based on the outputs of the thermometer and the pressure gauge, S Since the / N ratio is increased and a highly accurate vertical displacement detection device for a ship is obtained which is less affected by the drift of the measurement system, that is, the zero point shift of the measuring instrument, the present invention is extremely useful industrially.
【００１７】また、請求項２の発明によれば、同一断面
積を有する左右１対の上端閉塞竪管の下端部を比較的大
断面で比較的長い横方向連通管にて連通し、上記各竪管
及び連通管に流体を封入し、上記各竪管の上端部にそれ
ぞれ密閉空気室を形成してなるＵ字管において、上記密
閉空気室の一方にそれぞれ配設された温度計及び圧力計
と、上記温度計及び圧力計の出力に基づいて上記流体の
上面の振動変位を演算する演算器とを具えたことによ
り、Ｓ／Ｎ比を大きくし、計測系のドリフトの影響の少
ない高精度の船舶の水平変位検出装置を得るから、本発
明は産業上極めて有益なものである。According to the second aspect of the present invention, the lower end portions of the pair of left and right upper end blocking vertical pipes having the same cross-sectional area are communicated with each other by a lateral communication pipe having a relatively large cross section and a relatively long length. In a U-shaped tube in which a fluid is enclosed in a vertical pipe and a communication pipe, and a closed air chamber is formed at the upper end of each vertical pipe, a thermometer and a pressure gauge respectively disposed in one of the closed air chambers. And a calculator for calculating the vibration displacement of the upper surface of the fluid based on the outputs of the thermometer and the pressure gauge, thereby increasing the S / N ratio and reducing the influence of the drift of the measurement system with high accuracy. The present invention is extremely useful industrially because it can obtain the horizontal displacement detection device for a ship.
【図１】本発明を高速艇の上下変位検出に適用した第１
実施例を示す縦断面図である。FIG. 1 is a first example in which the present invention is applied to detection of vertical displacement of a high-speed boat.
It is a longitudinal section showing an example.
【図２】本発明を高速艇の水平変位検出に適用した第２
実施例を示す縦断面図である。FIG. 2 is a second example in which the present invention is applied to detect horizontal displacement of a high-speed boat.
It is a longitudinal section showing an example.
【図３】高速客艇の船体振動加速度応答を示す線図であ
る。FIG. 3 is a diagram showing a hull vibration acceleration response of a high-speed passenger boat.
【図４】本発明装置の伝達特性を示す線図である。FIG. 4 is a diagram showing a transfer characteristic of the device of the present invention.
【図５】本発明装置により検出される船体動揺を示す線
図である。FIG. 5 is a diagram showing a hull motion detected by the device of the present invention.
【図６】従来の船体変位の検出要領を示すブロック図で
ある。FIG. 6 is a block diagram showing a conventional procedure for detecting displacement of a ship.
１ 上下変位用検出装置 ２ 水平変位用検出装置 ３ａ，３ａ′，３ｂ，３ｂ′ 竪管 ４ 流体 ５ａ，５ａ′，５ｂ，５ｂ′ 空気室 ６ 船体 ７ 温度計 ８ 圧力計 ９ 演算装置 １０ 横管 Ａ 竪管の断面積 Ｇ ゲイン ｈ 空気室の鉛直方向の長さ ｎ 空気室分子のモル数 Ｐ 圧力 Ｔ 温度 Ｒ アボガドロ定数 1 Vertical displacement detector 2 Horizontal displacement detector 3a, 3a ', 3b, 3b' Vertical pipe 4 Fluid 5a, 5a ', 5b, 5b' Air chamber 6 Hull 7 Thermometer 8 Pressure gauge 9 Computing device 10 Horizontal pipe A Cross-sectional area of vertical tube G Gain h Vertical length of air chamber n Number of moles of air chamber molecule P Pressure T Temperature R Avogadro constant
Claims (2)
竪管の下端部を比較的大断面で比較的短い横方向連通管
にて連通し、上記竪管及び上記連通管に流体を封入し、
上記各竪管の上端部にそれぞれ密閉空気室を形成してな
るＵ字管において、上記密閉空気室の一方にそれぞれ配
設された温度計及び圧力計と、上記温度計及び圧力計の
出力に基づいて上記流体の上面の振動変位を演算する演
算器とを具えたことを特徴とする船舶の上下動揺検出装
置。1. A pair of left and right upper end closed vertical pipes having the same cross-sectional area are connected at their lower end portions with a lateral communication pipe having a relatively large cross section and a relatively short length, and a fluid is enclosed in the vertical pipe and the communication pipe. Then
In a U-shaped tube in which a closed air chamber is formed at the upper end of each of the vertical tubes, a thermometer and a pressure gauge respectively disposed in one of the closed air chambers and an output of the thermometer and the pressure gauge are provided. A vertical motion detection apparatus for a ship, comprising: a calculator for calculating the vibration displacement of the upper surface of the fluid based on the above.
竪管の下端部を比較的大断面で比較的長い横方向連通管
にて連通し、上記各竪管及び連通管に流体を封入し、上
記各竪管の上端部にそれぞれ密閉空気室を形成してなる
Ｕ字管において、上記密閉空気室の一方にそれぞれ配設
された温度計及び圧力計と、上記温度計及び圧力計の出
力に基づいて上記流体の上面の振動変位を演算する演算
器とを具えたことを特徴とする船舶の水平動揺検出装
置。2. A pair of left and right upper end closed vertical pipes having the same cross-sectional area are connected at their lower end portions by a lateral communication pipe having a relatively large cross section and a relatively long length, and the vertical pipes and the communication pipes are filled with fluid. Then, in a U-shaped tube formed by forming a closed air chamber at the upper end of each of the vertical tubes, a thermometer and a pressure gauge respectively disposed in one of the closed air chambers, and a thermometer and a pressure gauge A horizontal motion detecting device for a ship, comprising: a calculator for calculating the vibration displacement of the upper surface of the fluid based on the output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17614793A JPH0712560A (en) | 1993-06-23 | 1993-06-23 | Hull rolling-and-pitching detection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17614793A JPH0712560A (en) | 1993-06-23 | 1993-06-23 | Hull rolling-and-pitching detection apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0712560A true JPH0712560A (en) | 1995-01-17 |
Family
ID=16008486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17614793A Withdrawn JPH0712560A (en) | 1993-06-23 | 1993-06-23 | Hull rolling-and-pitching detection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0712560A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09119830A (en) * | 1995-03-13 | 1997-05-06 | Tracto Technik Paul Schmidt Mas Fab Gmbh | Measuring device for detecting relative height of object |
| JP2019025997A (en) * | 2017-07-27 | 2019-02-21 | 株式会社Ihi | Underwater equipment |
-
1993
- 1993-06-23 JP JP17614793A patent/JPH0712560A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09119830A (en) * | 1995-03-13 | 1997-05-06 | Tracto Technik Paul Schmidt Mas Fab Gmbh | Measuring device for detecting relative height of object |
| JP2019025997A (en) * | 2017-07-27 | 2019-02-21 | 株式会社Ihi | Underwater equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5069075A (en) | Mass flow meter working on the coriolis principle | |
| CA2587175C (en) | Method and apparatus for determining flow pressure using density information | |
| EP0733886A2 (en) | Coriolis mass flowmeter | |
| JPS6239935B2 (en) | ||
| JPH0249136A (en) | Apparatus for measuring effect of transverse window on vehicle, especially automobile or the like | |
| US4809545A (en) | Gravimetry logging | |
| US4602508A (en) | Continuous gravity gradient logging | |
| JPH0712560A (en) | Hull rolling-and-pitching detection apparatus | |
| FI68319B (en) | SAETTING THE ORDERING OF THE MEASURE OF THE FOLLOWING BANSPAENNING OCH YTVIKT | |
| GB2160314A (en) | Karman vortex flowmeters | |
| JPH0735646A (en) | Apparatus for measuring characteristic of leaf spring | |
| CN110133665A (en) | A kind of Doppler measurement method of the ultrasonic transducer based on envelope | |
| JP3590900B2 (en) | Ultrasonic flow meter | |
| JPH07243893A (en) | Pressure type liquid level measuring apparatus | |
| JP3189265B2 (en) | Acoustic liquid level detector | |
| JPH0618316A (en) | Measuring apparatus for position of liquid surface | |
| SU742762A1 (en) | Tuning-fork comprising density meter for liquid media | |
| Kobayashi et al. | Gauging fuel in deformed tanks by pneumatic methods-Application to automobile fuel gauges | |
| SU1767352A1 (en) | Device for determining fluid level | |
| SU977928A2 (en) | Mercury electrolytic transducer | |
| JP2000171282A (en) | Acoustic volume meter for measuring volume difference | |
| JPH06347264A (en) | Angle-of-inclination sensor | |
| JP3237688B2 (en) | Edge tone flow meter | |
| JPH11211472A (en) | Vertical displacement measuring device | |
| JPH05133792A (en) | Liquid level sensing device for pressure vessel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000905 |