JP2003054490A - Rolling reducing device for ship and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install ART on a ship on which it is difficult to install a usual ART managing expanded range of righting moment of the ship due to excessive quantity of used liquid, a free surface secondary moment of a tank or the like and combination regulation of righting moment. SOLUTION: A primary tank for varying ART resonance frequency having a liquid passage height of a same dimension and sharing side partition wall partitioning front and rear, and a secondary tank capable of adjusting the free surface secondary moment of the tank to corresponding to GM value are integrated to form a U-shaped pipe type rolling reducing water tank as a main body. Combination of the primary tank and the secondary tank, selection of tanks A, B, C, variation of ART resonance frequency and liquid braking and the like are automatically operated to cope with wide range of GM value and lateral rolling frequency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wobble reducing water tank apparatus for a ship, and a first tank and a free tank for making it possible to create at least two or more natural periods in a U-shaped tube water shaking tank. A tank shape that integrates a second tank that adjusts the secondary moment of liquid level and a plurality of natural periods by opening and closing dampers, and further reduces the shaking of the vessel that automatically controls the movement or stop of liquid. The present invention relates to a water tank device and a control method thereof.

[0002]

2. Description of the Related Art A U-tube type passive control type anti-sway water tank (hereinafter also referred to as ART) has been known as a device for reducing rolling of a ship.

An important consideration when planning an ART is to understand the rolling period range of the ship. The formula for estimating the rolling natural period specified in the Ship Stability Regulation is as follows. Ts = (2.01 x B x k) / √GM Ts: Ship rolling natural period, B: Ship width, k: Ring radius (coefficient), GM: Metacenter-height It can also be understood from this formula Thus, the larger the GM value, the shorter (faster) the rolling natural period of the ship.

The following is a list of the introduction to ART. (1) The free surface secondary moment of the tank is calculated by the following calculation formula. Second moment of area of ART (Ti) = (TB ³ −B1
³ ) x L / 12 TB: Total width of tank, B1: Inner width of tank, L: Length of tank (2) Free surface secondary moment, assuming that the total width of tank is constant, the wider the width of wing tank growing. (3) Further, the larger the second moment of free surface of the tank, the larger the damping moment becomes. (4) When the width of the wing tank is constant (a) When the duct height is increased, the natural period becomes shorter (faster)
Become. (B) As a matter of course, lowering the duct height makes it longer (slower). (5) When the duct height is constant (b) When the width of the wing tank is widened, the tank natural period becomes longer. (B) If the width of the wing tank is narrowed, the tank's natural period becomes shorter. (6) When the width of the wing tank is constant (a) When the length of the wing tank and the length of the duct are the same, the shortest natural period in the tank shape can be obtained. (B) If the duct length is made smaller than the wing tank length, a long natural period can be obtained.

Therefore, the ART (5) has been developed in which a plurality of wing tanks having a constant duct height are constructed and the cycle is varied by opening and closing the air duct. (Utility model registration No. 1216073) However, (1) There is a limit to the width of the wing tank, and the variable amount of the cycle is about 0.5 to 1 second, so that a wide range of tank cycle required for the anti-vibration device cannot be obtained. . (2) The fast (short) roll of the ship is when the GM value is large, but in order to correspond to the fast (short) roll of the ship, it is necessary to narrow the width of the wing tank, and as a result, The free surface second moment is small and the damping efficiency is small. For these reasons, there is a problem that the ship is limited to a relatively small ship type and the amount of GM change is small.

As can be seen from the above-mentioned introduction of ART, G
Faster (shorter) to cope with a large M value full load state
In order to make the liquid passage high to secure the cycle and secure high vibration damping efficiency, it is necessary to lengthen the tank length and secure a large second moment of free surface. Further, in order to correspond to a port entry state with a small GM value with a tank size corresponding to a large GM value, it is necessary to install a large number of dampers in order to obtain a slow (long) cycle. Furthermore, the free surface second moment of the tank is too large for a small GM when entering the port. In other words, if there is too much GM value range between full-flight departure and arrival and port entry, the size of conventional tanks will become huge, and the weight of the ART, excessive liquid usage, reduction in cargo volume, and stability will increase. In many cases, installation was difficult due to regulations.

[0007]

SUMMARY OF THE INVENTION According to the present invention, even if the GM value range is wide between full-scale departure and port entry, a small amount of liquid is used due to the combination of tank shapes and a wide range of ART cycle range with a small damper. And a method for controlling the shaking motion reducing tank of a ship, characterized by automatically controlling the selection of the tank shape according to the shaking condition, the variation of the natural period of the ART, and the braking of the liquid. To aim.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and the invention of claim 1 has a horizontal partition wall which has liquid passages of the same size and which is divided into front and rear. The main body is a U-shaped tube type shaking water tank in which two water tanks of a shared first tank and second tank are integrated.

A pair of at least two set on both sides of the hull
In order to form two wing tanks, vertical partition walls of arbitrary width are hung symmetrically in parallel in both wing tanks in the front-rear direction of the hull to form a plurality of divided tanks. The height should be the same as the inner dimension.

Wing tanks set on both sides of the hull,
A liquid passage for connecting the bottoms of these wing tanks to move the liquid in the left-right direction, a damper for changing the natural period of the ART in the liquid passage, and at least one or more locations in the middle of opening and closing the damper. A means for enabling a stop, and a pair of rectifying plates for enabling rectification of the liquid passing around the damper at a position for stopping the damper at a predetermined position,
Further, the inside of the wing tank and the outside of the wing tank, which are in communication with each other near the upper portion of the relative position of the two wing tanks, through means such as a remotely driven valve that enables liquid braking and ART natural period variation It consists of an air duct for the wing tank of.

The second tank forms a pair of wing tanks on the same side as the outer vertical partition in the divided wing tank of the first tank, with the inside of the wing tank forming a pair of wing tanks. At the bottom of these wing tanks, The height of the liquid passage of the first tank is the same as the inner dimension of the liquid passage, and the liquid passage is connected to the vicinity of the upper part of both wing tanks via a means such as a remote drive valve for the purpose of braking the liquid. Composed of air ducts.

A damper for changing the ART natural period is provided in the first tank, and an opening / closing device for opening / closing the damper and a potentiometer for detecting the stop position of the damper are attached to fully close the damper. Means is provided for transmitting the position of halfway stop, full open, etc. to the control section by an electric signal.

As the control means of the ART body, the contents of the information output from the tilt sensor for detecting the rolling angle of the ship and the like are decoded, and the control section for outputting the control signal and the control section Based on the control signal of (1), it is provided with an opening / closing device device section for remotely driving the valve and the damper, and executes a predetermined control specification so as to correspond to the average cycle value of the ship. This is a vessel shake reducing aquarium device characterized by being able to automatically operate combinations of tanks, selection of tanks A, B, C, variable cycle of ART, and liquid braking.

The first tank of the invention of claim 1 is a tank for securing a plurality of natural periods, and the second tank also obtains a free surface second moment corresponding to a large GM value, and at the time of a small GM value. Is a tank for adjusting the second moment of free surface to a value close to zero.

According to a second aspect of the present invention, in the control method of the motion reducing water tank apparatus for a vessel according to the first aspect, the rolling angle of the vessel is detected, and the single angle or the average rolling period of the rolling is detected by the detected value. Based on the result of the calculation, in order to correspond to the average period value, control specifications for driving predetermined valves and dampers are executed as necessary, and the combination of the first tank and the second tank and the first tank have A control method for a shaking motion reducing water tank device for a ship, characterized in that selection of tanks A, B, C, variable cycle of tanks, liquid braking, etc. can be automatically operated.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION In the following, according to an embodiment of the present invention, an ART main body 1 in which two water tanks composed of a first tank 2 and a second tank 3 are integrated, is provided with three sets of air ducts and one set of dampers.
An example having five control specifications (non-actuated, actuated-1, actuated-2, actuated-3, actuated-4) consisting of four types of natural periods of the non-actuated state and the ART will be described with reference to the drawings.

Basic AR for achieving the above-mentioned object
As shown in FIG. 1, the configuration of T itself has two water tanks, a first tank 2 and a second tank 3, which have the same heights of liquid passages 5 and 6 and share a horizontal partition wall 13 divided into front and rear. In the U-shaped tube type shaking water tank body 1 with integrated

The first tank 2 has a pair of at least two wing tanks 16a and 16b set on both sides of the hull, and longitudinally dividing walls 15a and 15b of arbitrary width are symmetrically formed in both wing tanks. To form a plurality of divided tanks 4a, 4b, 4c, 4d in parallel in the front-rear direction, and the lower end sides of the vertical partition walls 15a, 15b are the liquid passage 5
The height should be the same as the inner dimension.

Further, the wing tanks 16a, 16b set on both sides of the hull, the liquid passage 5 for connecting the bottoms of these wing tanks to move the liquid w in the left and right direction, and the natural period of the ART in the liquid passage A set of dampers 9 that can be changed is provided.

The damper 9 employs a remote drive type capable of opening and closing at about 90 degrees, and means for stopping at least one place in the middle of opening and closing, and for detecting the stop position of the damper. The potentiometer 17 and the like are attached, and means for transmitting the position of the damper 9 which is fully closed, stopped halfway, and fully opened to the control unit 18 by an electric signal is provided.

Further, at a position where the damper 9 is stopped at a predetermined position, a pair of rectifying plates 11a and 11b for rectifying the liquid w passing around the damper is provided as shown in FIG.

Both wing tanks 4 divided into a plurality of parts
In the vicinity of the upper part of the relative position of a, 4b, 4c, 4d, the liquid w
For the inner wing tanks 4c and 4d and the outer wing tank 4 which are communicated with each other through means such as remotely driven valves 7a and 7b capable of braking the vehicle and varying the ART natural period.
It is composed of air ducts 8a and 8b for a and 4b.

The second tank 3 is a vertical wing 15a, 15b on the outside of the divided wing tanks 4c, 4d of the first tank 2.
A pair of wing tanks on both sides of the wing tanks 4e and 4f are formed at the same position as the inside of the wing tanks 4e and 4f. At the bottom of these wing tanks 4e and 4f, the inner dimension of the height of the liquid passage 5 of the first tank 2 is formed. A liquid passage 6 connected at the same height as
An air duct 8c is provided near the upper portions of both wing tanks 4e and 4f so as to communicate with each other through a means such as a remotely driven valve 7c capable of braking the liquid w.

Although not shown in the figure, the tank body 1 is provided with necessary fittings such as a pouring / draining pipe, a sounding pipe, an air vent pipe, etc. The pipe is provided with a closing means to enable a sealed state.

The control device mechanism is roughly divided into a control part 18 including an inclination sensor 20 and the like, and a switchgear device part 19.

The control unit 18 includes an inclination sensor 20.
Operation decoding circuit 2 for decoding the content of the information output from the
1, a control execution circuit 22, and an information processing circuit 23.

The operation decoding circuit 21 calculates each average value from the instantaneous roll angle and roll period value based on the data output from the tilt sensor 20. To calculate the average value,
A single average of 2 to 5 times is averaged, and a moving average method is used in which new values are always included and old values are removed. Further, in addition to the motion information, if the information such as the wind direction, the wind speed, and the ship speed is taken in and the operation is decoded, the control with high accuracy becomes possible.

Based on the result decoded by the operation decoding circuit 21, which control specification it belongs to is discriminated, and a control signal for executing the preset opening / closing specifications of the valves 7a, 7b, 7c and the damper 9, It outputs to the switchgear device unit 19 via the control execution circuit 22.

The operating status of each device is grasped by the information processing circuit 23 one by one, and the information is stored in the IC memory and displayed on the control panel (not shown). Although not shown, conditions such as the inclination angle and the cycle can be transmitted to other navigation equipment as navigation information.

The switchgear device unit 19 includes a drive unit and a solenoid valve 2.
5a, 25b, 25c, 25d, damper opening / closing device 1
0, potentiometer 17, valves with switches 7a, 7
b, 7c, etc. Some mechanisms may not require a drive. For example, when the drive source can be directly supplied from another line, the steps of starting and stopping the drive machine can be omitted.

In the present embodiment, the drive system of the valves 7a, 7b, 7c and the damper 9 is assumed to be hydraulic drive. However, when a pneumatic system or an electric system is used, the switchgear device section 19 is selected depending on the system. Items that can be omitted in the above may be omitted. Further, although the air ducts 8a, 8b, 8c are connected to each other, the air ducts are not connected to the left and right, and the valves 7a, 7b, and 7c are provided to the respective air ducts so that the air ducts are individually opened to the atmosphere. Alternatively, the same effect can be obtained by providing a valve on each port.

In the present embodiment, one set of dampers 9 is provided and the midway opening is set at one location. However, if the midway opening is set at two locations, the number of tank natural cycles increases by one. If the number of dampers is increased by one, the natural cycle of the tank will be increased by two points.
Therefore, the required number of dampers 9 may be provided in consideration of the cycle range of the ship to be installed.

First, in this embodiment, substantially four sets of tanks including the tank A of the first tank 2, the tank B and the tank C, and the second tank 3 are formed, and the combination thereof is determined according to the use conditions. Select.

The state shown in FIG. 8 is called tank A. This state is formed when the valve 7a with the air duct 8a for the inside is closed and the valve 7b with the air duct 8b for the outside is opened. When the valve 7a is closed to block the flow of air, the inner wing tanks 4c and 4d are in a sealed state, and only the outer wing tanks 4a and 4b are tanks having an ART function. This shape is the same as the ART
As described in the introduction, the movement of the liquid in the tank moves in the liquid passage at a fast (short) period, so that it is possible to adapt to the state of the short rolling period. In the present embodiment, it is assumed that the state of the tank A is operation-1 and the natural period is 6 seconds.

The state shown in FIG. 9 is called tank B. This state is formed when the valve 7a with the air duct 8a for the inside is opened and the valve 7b with the air duct 8b for the outside is closed. When the valve 7b is closed to block the flow of air, the outer wing tanks 4a and 4b are sealed, and only the inner wing tanks 4c and 4d are ART.
It becomes a tank with the function of. This shape is tank A
The movement of the liquid in the tank is faster than that in the liquid passage in the liquid passage with a (short) cycle, but the value of the damping moment is
Since it is smaller than Tank A, it is not used alone but used when used in combination with a fin stabilizer.

The state shown in FIG. 10 is called tank C. In this state, the valve 7 with both air ducts 8a and 8b
It is formed when a and 7b are opened. In this case, tank A and tank B are united to form a single wing tank 16
Since it has the functions of a and 16b, the movement of the liquid w is slower than that of the tank A and moves in the duct in a long cycle, so that it is possible to adapt to the state of a long rolling cycle. . In this embodiment, it is assumed that the state of the tank C is operation-2 and the natural period is 8 seconds.

Here, the formation of the tanks A, B and C will be described. Valve 7a with each air duct 8a, 8b, 8c,
When 7b and 7c are closed, the corresponding wing tanks 4a, 4b and 4 connected by the air ducts 8a, 8b and 8c.
Since the flow of air in c, 4d, 4e, 4f is cut off and the tank is completely airtight, even if the hull sways, the liquid remains almost stationary, but when the corresponding valve is opened, In the tank, the air in the tank flows through the air duct and the tank moves in accordance with the rolling motion of the hull.

Incidentally, all the air ducts 8a, 8b, 8
When the valves 7a, 7b, 7c with c are closed, the flow of air is shut off, the liquid w can hardly be moved, and the anti-sway tank becomes inoperative. In this embodiment, this state is inactive.

Furthermore, when the tank C is in use, as shown in FIG. 12, when the damper 9 provided inside the liquid passage 5 is stopped halfway, the effective cross-sectional area of the liquid passage 5 becomes smaller than that of the tank C, and the liquid w The movement is slower than that of the tank C, and the movement is made in the duct in a long cycle. Therefore, it is possible to adapt to the state in which the rolling cycle is longer. In this embodiment,
Assume that the natural period is 10 seconds for operation-3.

Furthermore, when the tank C is used and the damper 9 provided in the liquid passage 5 is fully closed as shown in FIG. 5, the effective cross-sectional area of the liquid passage 5 becomes smaller than that of the operation-3, and the liquid w Is slower than the operation-3, and moves in the duct in a long cycle, so that it can adapt to a state in which the roll cycle is longer. In this embodiment, the natural period is assumed to be 12 seconds as operation-4.

Since the second tank 3 shown in FIG. 11 has the same shape as the tank A, it has the same natural period as the tank A.
In this embodiment, the tank A and the second tank 3 are used at the same time.

Five control specifications (non-actuated, actuated-1, actuated-2, actuated-3, actuated-4) of the ART main body 1 having four types of natural periods of the non-actuated state and the ART as described above are provided.
In the control method in (1) to (8), the following rolling ranges are overlapped at adjacent points, and the average rolling period of the ship deviates from the rolling range during the execution of a certain control specification. Unless otherwise specified, set so that other control specifications are not executed.

In order to make it easy to understand, specific numerical values will be set and described. (I). Non-actuated, all air ducts 8a, 8b, 8
It is possible by closing the valves 7a, 7b, 7c with c. When the value of the average cycle is 13.6 seconds or more and 4.6 seconds or less, the valves 7a, 7b, 7c are forcibly closed A
RT becomes inactive. In this state, the average cycle is 13.
It is held until it enters between 3 seconds and 5.0 seconds. (B). Operation-1 assumes a tank natural period of 6 seconds. This control specification can be achieved by fully opening the valve 7b with an air duct, closing 7a, and opening the damper 9. Similarly, the second tank 3 shown in FIG. 11 is assumed to have a tank natural period of 6 seconds. This control specification is possible by opening the valve 7c with an air duct. When the value of the average period is within the range of 7.3 seconds, control is executed and the state is maintained. (C). Run-2 assumes a tank natural period of 8 seconds. This control specification is based on valves 7a and 7 with air ducts.
This can be done by fully opening b, closing 7c, and opening the damper 9. Control is executed and held when the value of the average cycle is within the range of 9.3 seconds to 6.6 seconds. The specifications for these controls are
It is executed when the value of the average cycle is out of the cycle range in which the control is being executed and enters the corresponding cycle range. (D). Operation-3 assumes a tank natural period of 10 seconds. This control specification is made possible by fully opening the valves 7a and 7b with air ducts, closing 7c, and moving the damper 9 to an intermediate position. Average period value is 11.3 seconds to 8.
Control is executed and held within the range of 6 seconds. These control specifications are executed when the value of the average cycle deviates from the cycle range in which the control is being executed and enters the corresponding cycle range. (E). Operation-4 assumes a tank natural period of 12 seconds. This control specification can be achieved by fully opening the valves 7a and 7b with air ducts, closing 7c, and closing the damper 9. The control is executed and held when the value of the average period is within the range of 13.3 seconds to 10.6 seconds. The specifications of these controls are that the value of the average cycle is out of the cycle range during control execution,
It is executed when the corresponding cycle range is entered.

The embodiment of the present invention is provided with three sets of air ducts and one set of dampers, in which two water tanks composed of the first tank 2 and the second tank 3 are integrated, and the non-operating state and the natural period of ART. Five control specifications consisting of four types (non-operation, operation-
1, the operation-2, the operation-3, and the operation-4) have been described, but the number of damper sets may be further increased, and the value of overlapping adjacent portions in each cycle range may be different for each ship. It is determined by the designer as appropriate.

[0045]

As is apparent from the above description, according to the ship motion reducing water tank apparatus and the control method thereof of the present invention, (1) it is possible to obtain four or more types of ART natural periods with one set of dampers. Becomes (2) Since the number of dampers is reduced, the facility cost can be reduced. (3) When two sets of dampers are provided, the number of ART natural periods increases, so the effective period range of ART is further expanded. (4) Expanding the effective period range makes it possible to prevent adverse effects such as chasing waves that occur during a long period. (5) This minimizes not only the control within the cycle range in which the liquid works effectively, but also the fatal defect that occurs when the ART liquid does not work effectively due to some factors. You can (6) Furthermore, the fatal drawback of ART that the effective cycle range is narrow can be easily eliminated, and the control is automatically performed without any human intervention. in this way,
The present invention provides a combination of the first tank and the second tank, the tank A, and the tank A, even if the GM value range between the full-scale departure and the entry is wide.
Since these can be automatically operated, such as selection of B and C, variable cycle of ART, and liquid braking, it is optimal for the rolling cycle of the ship which changes momentarily due to the influence of the meeting cycle and sea weather conditions. Automatically change the possible ART natural period,
Alternatively, even when a roll cycle that gives the above-mentioned adverse effect is encountered, the ART can be deactivated in order to prevent entrainment roll, so that a stable roll effect can always be obtained. This is an invention that is industrially highly effective.

[0046]

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an anti-sway water tank body in which a first tank and a second tank according to the present invention are integrated.

FIG. 2 is a block diagram showing an embodiment of a control unit configuration related to control of the present invention and a control mechanism configuration relationship of opening / closing operation of a valve or a damper.

FIG. 3 is a plan view of the tank top plate of the shaking water tank body according to the present invention.

FIG. 4 is a plan view of the liquid passage portion top plate of the shaking water tank body according to the present invention.

FIG. 5 is a plan view of the bottom surface of the shaking water tank body according to the present invention.

FIG. 6 is a transverse cross-sectional view showing an embodiment of a first tank that constitutes the anti-sway water tank body according to the present invention.

FIG. 7 is a transverse cross-sectional view showing an embodiment of a second tank that constitutes the anti-sway water tank body according to the present invention.

FIG. 8 is a cross-sectional view of the tank A in FIG. 6 in which liquid can be moved by closing the valve with the air duct inside and opening the valve with the air duct outside in the first tank.

9 is a cross-sectional view of the tank B in FIG. 6 in which liquid can be moved by opening an inner valve with an air duct and closing an outer valve with an air duct.

10 is a cross-sectional view of the tank C in the first tank shown in FIG. 6, in which liquid can be moved by opening both the valve with an inner air duct and the valve with an outer air duct.

FIG. 11 is a cross-sectional view of the second tank in FIG. 7, in which liquid can be moved by opening a valve with an air duct.

FIG. 12 is a diagram showing an enlarged damper position (intermediate position) and a state of the straightening vanes in which the arrangement of the straightening vanes in FIG. 5 is enlarged.

[Explanation of symbols]

1 ... ART main body (swaying water tank main body), 2 ... first tank, 3 ... second tank, 4
a, 4b ... Outside wing tank, 4c, 4d ...
・ Inner wing tank, 4e, 4f ... Wing tank, 5, 6 ... Liquid passages 7a, 7b, 7c ... Valve with switch, 8a ...
Inner air duct 8b ... Outer air duct, 8c ...
Air duct 9 ... Damper 10 ...
Damper opening / closing devices 11a, 11b ... Current plate, 12 ...
・ Rib board 13 ... Horizontal partition wall, 14 ... Liquid flow direction 15a, 15b ... ・ Vertical partition wall, 16a, 16
b ... Wing tank w ... Liquid, 17 ... Potentiometer,
18 ... Control unit 19 ... Switchgear device unit, 20 ... Inclination sensor 21 ... Operation decoding circuit, 22 ... Control execution circuit 23 ... Information processing circuit, 24 ... Driving source 25a, 25b, 25c, 25d ... Solenoid valve

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[Procedure amendment]

[Submission date] November 14, 2001 (2001.11.
14)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Title of invention

[Correction method] Change

[Correction content]

Patent application title: Ship motion reduction device and control method thereof

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

Claims (2)

[Claims] 1. A pair of at least two set on both sides of the hull.
To construct two wing tanks (16a, 16b),
Vertical partition walls of arbitrary width (1
5a, 15b) are hung in parallel in the front-back direction of the hull to form a plurality of divided tanks (4a, 4b, 4c, 4d), and the lower ends of the vertical partition walls (15a, 15b) of the liquid passage (5) Wing tanks (16a, 16b) that are set to the same height as the inner dimension of the height and are set on both sides of the hull, and a liquid passage that connects the bottoms of these wing tanks to move the liquid (w) in the left-right direction ( 5) and a remote drive damper (9) for the purpose of changing the natural period of the ART in the liquid passage.
And a means for enabling at least one stop in the middle of opening and closing the damper, and a fully closed damper (9) equipped with a potentiometer (17) for detecting the stop position of the damper. , Means for transmitting the position such as halfway stop, fully open to the control section (18) by an electric signal, and a pair of means for rectifying the liquid passing around the damper at the position where the damper is stopped at a predetermined position. Rectifier plate (11a, 11
b) and the wing tanks (4a, 4a,
4b, 4c, 4d) in the vicinity of the upper part of the relative position, an inner wing tank (4c) communicating with means such as a remotely driven valve (7a, 7b) capable of braking the liquid and varying the ART natural period. , 4d) and air ducts (8a, 8b) for the outer wing tanks (4a, 4b), and a vertical partition (1a) in the wing tanks (16a, 16b) of the first tank (2). 15a, 15b) and a pair of wing tanks on both sides of the wing tank (4e, 4f) are formed inside the wing tanks (4e, 4f). The liquid passage (6) connected to the inner height of 5) and connected to the liquid passage (6) and a valve of a remote drive type capable of braking the liquid (w) near the upper portions of both wing tanks (4e, 4f) (7c) and other means Air duct (8 for communicating with
a second tank (3) consisting of c), and a U-shaped tube type water damping tank main body (1) integrally forming two tanks (2, 3) shared with the horizontal bulkhead (13) of the first tank , A tilt sensor (20) for detecting the lateral swing angle of the ship, and an operation decoding circuit (2) for decoding the content of the information output from the tilt sensor (2)
1), a control execution circuit (22), and an information processing circuit (23), a control section (18), and a valve (7a, 7a, which has been set in advance based on the result decoded by the control section).
7b, 7c) or a switchgear device unit (19) for executing the opening / closing specification of the damper (9). 2. The method for controlling a water movement reducing water tank device of a ship according to claim 1, wherein the rolling angle of the ship is detected, and based on the value, a single cycle of rolling and an average rolling cycle are calculated. , The control specifications for driving the valves (7a, 7b, 7c) and the damper (9), which are predetermined as necessary to correspond to the average period value, are executed, and the first tank (2) and the second tank Oscillation of a ship characterized in that the combination of (3), selection of tanks A, B, and C included in the first tank (2), tank cycle variation, liquid braking, etc. can be automatically operated. Control method for mitigation water tank device.