JP2002079993A - Anti-rolling water tank device for ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anti-rolling water tank device for a ship capable of avoiding the increase of the lateral tilt angle of a hull when rapid turn or the like is carried out. SOLUTION: This anti-rolling water tank device for a ship comprises a pair of tanks 1a and 1b installed in the ship, communication channels 2 for allowing the pair of tanks 1a and 1b to communicate with each other, an air duct 3 for connecting the pair of tanks 1a and 1b, and an air damper 4 of the air duct 3, and is so structured as to exert an anti-rolling function when the air damper 4 is opened, and to stop the anti-rolling function when the air damper 4 is closed. In this case, the anti-rolling water tank device for a ship is provided with a ship velocity detection means 6 for detecting the velocity of the ship, a rudder angle directing means 7 for directing the rudder angle of the ship, an anti-rolling function stop determination means 8 for determining whether or not the anti-rolling function of the anti-rolling water tank device is to be stopped by the use of a ship velocity signal from the ship velocity detection means 6 and a rudder angle directing signal from the rudder angle directing means 7, and an air damper control means 5 for controlling opening/closing of the air damper 4 by the direction from the anti-rolling function stop determination means 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a destabilizing water tank device for a ship in which a tilting water tank device is installed and in which the lateral inclination angle of the hull can be prevented from increasing when a sharp turn is made.

[0002]

2. Description of the Related Art Hitherto, as an apparatus for reducing the roll of a ship, there has been known an anti-oscillation tank apparatus using an anti-oscillation tank body having a U-shaped cross section. 2. Description of the Related Art Ships equipped with an anti-rolling water tank device can reduce a roll and can provide a comfortable ride and are widely used. In this attenuating tank apparatus, when a phase delay of about 90 degrees occurs between the rolling cycle of the hull and the (movement) cycle of the oscillation reducing fluid of the attenuating tank apparatus, the damping moment acts to increase the phase. This is a device that exerts the anti-rolling effect.

[0003] On the other hand, it is also known that, when a steady lateral inclination of the hull occurs due to some factor, the steady inclination increases due to the effect of the free liquid level of the depressed water tank device.

As a method of avoiding such a problem of the rocking water tank apparatus, there is a method disclosed in, for example, Japanese Patent Application Laid-Open No. H11-342891 (hereinafter referred to as a conventional example). This method is a control method of a rocking water tank device that detects a sudden turn of a ship and closes an air duct of the rocking water tank device to stop the movement of the vibration reducing fluid in the rocking water tank body.

[0005]

In the conventional anti-oscillation water tank device, when the ship makes a sharp turn, a steady lateral inclination occurs toward the outside of the center of turning, so that the moving liquid (oscillation liquid) of the anti-oscillation water tank device is used. The motion relaxation fluid) moves toward the outside of the center of rotation and is in a state of being offset. The tilt moment generated thereby further increases the hull side tilt angle. Therefore, a sudden turning of the ship is detected, and the anti-roll tank device is stopped to avoid an increase in the hull lateral inclination angle.

However, in the conventional anti-rolling water tank device, the anti-rolling water tank device is stopped only by detecting a steering angle command when the ship makes a sharp turn, so that the ship is used for navigation in stormy weather. When the roll of the ship is large, stopping the anti-roll tank device may deteriorate the safety in maneuvering.

[0007] In addition, in the case of a low boat speed, even when making a sharp turn,
It is not necessary to stop the attenuating tank device because the increase of the hull lateral inclination angle by the attenuating tank device is very small.

[0008] In the conventional anti-rolling water tank apparatus, a problem arises when the ship is heavily rolled or at a low boat speed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems of the prior art, and can avoid an increase in the lateral inclination angle of a hull of a ship, and can surely prevent the cruising in stormy weather or at low speed. An object of the present invention is to provide an anti-oscillation tank device for a ship that can exhibit an anti-oscillation function.

[0010]

According to a first aspect of the present invention, a pair of tanks installed on both sides of a ship, a communication channel for communicating the pair of tanks, and an air duct connecting the pair of tanks are provided. And an air damper provided in the air duct, wherein the air damper exhibits a damping function when the air damper is opened, and stops when the air damper is closed. A ship speed detecting means for detecting a ship speed of a ship equipped with the anti-rolling water tank device, a steering angle command means for commanding a steering angle of the ship, a ship speed signal from the ship speed detecting means and the steering angle command. Means for judging whether or not to stop the anti-oscillation function of the anti-oscillation tank device in accordance with a steering angle command signal from the means. Control the opening and closing of the damper It is obtained by a air damper control means.

Further, the invention according to claim 2 is that the steering angle command means of the boat is a steering stand or an autopilot device of the boat.

In the anti-rolling water tank device for a ship according to the present invention, a ship speed log (ship speed detector), a tidal current observation device or a G
The boat speed signal obtained from the speed detector by the PS and the steering angle command signal output from the steering angle commanding means such as a steering stand are input to the anti-oscillation function stop judging means. A determination is made as to whether or not to stop the rocking function of the shaking tank device.

If it is determined that the anti-oscillation function is to be stopped, a command is issued from the anti-oscillation function determination means to the opening / closing damper control means of the anti-oscillation water tank device to shut off the air damper. This prevents the fluid in the pair of tanks (fluctuation reducing fluid) from moving from the communication channel, thereby stopping the rocking function of the rocking water tank device, and increasing the hull lateral inclination angle during a sharp turn or the like. Can be avoided.

The steering angle command signal may be a steering angle command signal directly obtained from a device that outputs a steering angle command signal, or the steering angle may be set to a predetermined value by the steering angle command signal. The actual steering angle command signal fed back from the steering angle indicator of the rudder may be used, but the actual steering angle command signal has a time delay from the steering angle command signal from the device that outputs the steering angle command signal. Therefore, it is most preferable to use the steering angle command signal from the steering stand.

According to a third aspect of the present invention, the anti-oscillation function determining means determines whether the anti-oscillation function is stopped when each of the boat speed signal and the steering angle command signal exceeds a predetermined value. 3. The anti-rolling water tank device for a ship according to claim 1, wherein it is determined that the stop is performed.

According to a fourth aspect of the present invention, after the anti-oscillation function is stopped by the judgment of the anti-oscillation function stop judging means, each of the boat speed signal and the steering angle command signal of the ship is
4. The anti-rolling water tank device for a ship according to claim 3, wherein the anti-lowering function is re-executed by the determination of the anti-rolling function stop determining means when the value of the anti-rolling function decreases from a predetermined value.

According to the present invention, when the value of the boat speed signal and the value of the rudder angle command signal are each equal to or larger than a predetermined value, it is determined that the hull lateral inclination angle may increase due to a sharp turn or the like. Then, the rocking function of the rocking water tank device is stopped. Although it depends on the ship type, for example, in the case of a small boat, for example, when the boat speed is 12 knots or more and the value of the steering angle command is 2 knots,
By stopping the rocking function of the rocking water tank device when the angle reaches 0 degrees or more, it is possible to prevent the hull lateral inclination angle from increasing. By stopping the rocking function of the rocking water tank apparatus in this manner, it is possible to prevent the lateral inclination angle of the hull from increasing and to prevent the occurrence of load collapse.

Further, after the anti-oscillation function is stopped by the judgment of the anti-oscillation function determining means, when each of the boat speed signal and the steering angle command signal decreases below a certain value, the anti-oscillation function is stopped. Since the anti-oscillation function is exhibited again by the judgment of the function stop judging means, the anti-oscillation function can be effectively exhibited.

According to a fifth aspect of the present invention, the anti-oscillation function determining means determines whether or not to stop the anti-oscillation function based on the relationship between the boat speed and the steering angle. 3. The anti-rolling water tank device for a ship according to claim 1, which is performed based on a function stop curve.

According to a sixth aspect of the present invention, after the anti-rolling function is stopped by the determination of the anti-rolling function stop determining means, it is determined whether or not the anti-rolling function stop determining means again exerts the anti-rolling function. 6. The anti-oscillation water tank device for a ship according to claim 5, wherein the determination is made based on an anti-oscillation function stop curve determined from a relationship between the boat speed and the steering angle.

The anti-oscillation function stop determining means is set in advance with an anti-oscillation function stop curve determined from the relationship between the ship speed and the steering angle. If the current situation is above the dimming function stop curve, the dimming function of the anti-tilt tank device is stopped, and if it is below the dimming function stop curve, the dimming function is continued. To show off.

Further, after the lowering function is stopped by the determination of the lowering function stop determining means, it is determined whether or not the lowering function stop determining means exerts the lowering function again by determining the boat speed and the steering angle. The anti-sway function is performed based on the anti-sway function stop curve determined from the relationship, so that the anti-sway function can be effectively exerted.

According to a seventh aspect of the present invention, an average roll angle of the hull is input to the anti-rolling function stop determination means, and when the input average roll angle is equal to or greater than a preset value. 7. The anti-oscillation tank of a ship according to claim 1, wherein the anti-oscillation function is exerted even when the boat speed signal and the steering angle command signal are in a condition for stopping the anti-oscillation function. Device.

According to the present invention, when the average roll angle is equal to or larger than the predetermined value in a state where the anti-oscillation tank device is exhibiting the anti-oscillation function, the anti-oscillation water tank device can be reduced regardless of the cause. By judging that the effect can be expected and by not stopping the rocking function of the rocking water tank device, it is possible to avoid an increase in the hull maximum lateral inclination angle. For example, the average roll angle is about 12
When the ship reaches a certain degree, even if the values of the ship speed and the rudder angle are equal to or more than the predetermined values, the anti-rolling function of the anti-rolling water tank device is not stopped, and the anti-rolling function of the anti-rolling water tank device is exhibited. . When the average roll angle is about 12 degrees, assuming that the rocking effect of the rocking water tank is 40%, the average roll angle when the rocking function of the rocking water tank is stopped is about 20 degrees. When a sharp turn is performed with the anti-oscillation function of the anti-oscillation tank device, the increase in the inclination angle is 2 to 3 degrees when a normal GM is provided. 14 to 15 degrees, including the increase in the tilt angle when a sharp turn is performed while the swing angle and the anti-oscillation function of the anti-oscillation water tank device are exhibited, and the anti-oscillation function of the anti-oscillation water tank device is stopped. If not performed, the maximum inclination angle becomes smaller.

The invention according to an eighth aspect of the present invention is the case where the initial tilt angle is calculated by inputting the roll angle of the hull to the anti-rolling function stop determination means, and the initial tilt angle of the ship is equal to or greater than a predetermined value. Determining whether or not to stop the anti-oscillation function of the anti-oscillation water tank device based on the tilt direction and the turning direction of the hull according to claims 1, 2, 3, 4, 5, 6, or 7. It is a rocking water tank device of the ship described.

According to the present invention, when the ship has an initial inclination angle (for example, starboard +3 degrees or more), the hull inclines to port (-) when making a right turn. It is determined that the increase in the side inclination angle accompanying the above works to eliminate the initial inclination angle, and the hull does not stop on the starboard side when the anti-rolling function of the anti-rolling water tank device is not stopped and when turning left. Therefore, it is determined that the increase in the lateral inclination angle accompanying the turn is added to the initial inclination angle, and it is determined that the hull lateral inclination angle is excessively large, and the lowering function of the lowering tank apparatus is stopped.

As described above, by using the initial tilt angle as a determination criterion and exhibiting the anti-oscillation function of the anti-oscillation tank device,
It is possible to prevent an excessive increase in the hull lateral inclination angle.

The initial tilt angle is obtained by adding the roll angle time series data measured by the rocking detector to the starboard tilt angle by adding (+),
The weighted average value is obtained by setting the port tilt angle to minus (-).

The direction of turning is determined by a steering angle command signal input to the anti-oscillation function stop determination means.

[0030]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of an anti-rolling water tank device for a ship according to the present invention.

FIG. 1 is an explanatory view of an embodiment of a ship attenuated water tank apparatus according to the present invention, in which (a) is a block diagram showing the entire configuration of the attenuated water tank apparatus, and (b) is a reduced water tank. FIG. 3 is a perspective view of a portion that exhibits a rocking function of the device. This anti-rolling water tank device is disposed on both sides of a ship (not shown), and includes a pair of anti-rolling water tanks (anti-rolling tanks, hereinafter abbreviated as tanks) 1a and 1b in which a rocking fluid W is accommodated.
A communication channel 2 for communicating the tanks 1a and 1b, an air duct 3 for flowing air between the tanks 1a and 1b,
An air damper 4 provided in the middle of the air duct 3 for blocking air flow, a damper control device 5 for controlling opening and closing of the air damper 4, a ship speed detecting device 6 for detecting a ship speed, and a command for a steering angle. Angle determination device 7 and a boat speed signal from the boat speed detection device 6 and a steering angle command signal from the steering angle command device 7 to determine whether or not to stop the rocking function of the rocking water tank device. And a rocking detector 9 for detecting rocking of the ship.

In this rocking water tank apparatus, when rocking the ship, the air damper 4 of the air duct 3 is opened to allow air to flow between the tanks 1a and 1b. The swing relaxation fluid W can freely move between the tanks.

When the boat speed is high and the rudder angle is large, the air damper 4 is closed when it is determined that the lateral inclination angle of the hull increases if the anti-tilt function of the anti-tilt water tank apparatus is continued to be exerted. By blocking the ventilation between the tanks 1a and 1b, the swing alleviating fluid W is prevented from moving from one tank to the other tank through the communication water channel 2, thereby reducing the rocking function of the rocking water tank device. I try to stop.

Next, a first method for determining whether or not to continue exerting the anti-oscillation function in this anti-oscillation water tank device will be described. The ship speed signal from the ship speed detecting device 6 and the steering angle command signal from the steering angle command device 7 are used to determine whether the anti-rotation function is stopped.
Is input to The threshold values of the ship speed and the steering angle are set in advance in the anti-rolling function stop determination device 8, and when the boat speed and the steering angle exceed the respective threshold values, it is determined that the anti-rolling function is stopped. Then, a command is issued from the anti-oscillation function stop determination device 8 to the damper control device 5, the air damper 4 is closed, and the anti-oscillation function is stopped. On the contrary, when the ship speed and the rudder angle do not exceed the respective threshold values, the anti-rolling function continues to be exerted.

In addition, after the anti-oscillation function is stopped by the judgment of the anti-oscillation function stop judging device 8, when each of the boat speed signal and the steering angle command signal decreases below a predetermined value, the above-mentioned anti-oscillation function is turned off. By the determination of the rocking function stop determination device 8, the anti-rolling function is again exerted.

The boat speed detector 6 may be appropriately selected from a boat speed log (boat speed detector), a tidal current observation device, a GPS speed detector, and the like. The steering angle command device 7 may be a steering stand or an auto-pilot device that outputs a steering angle command signal, or sets a rudder to a predetermined value according to a steering angle command signal from these devices. The actual steering angle command signal fed back from the steering angle indicator may be used, however, since the actual steering angle command signal has a time lag from the steering angle command signal from the device that outputs the steering angle command signal, It is most preferable to use a steering angle command signal output from a steering stand or an autopilot device.

Next, a second method for determining whether or not to continue exerting the anti-oscillation function in this anti-oscillation water tank device will be described. The ship speed signal from the ship speed detecting device 6 and the steering angle command signal from the steering angle command device 7 are used to determine whether the anti-rotation function is stopped.
Is input to The anti-rolling function stop determination device 8 is set in advance with an anti-rolling function stop curve that defines a range in which the anti-rolling function is stopped based on the relationship between the boat speed and the steering angle. A determination is made as to whether the curve exceeds the rocking function stop curve.

If the relationship between the boat speed and the rudder angle exceeds the anti-sway function stop curve, a command is issued from the anti-sway function stop determination device 8 to the damper control device 5, and the air damper 4 is closed. And the anti-roll function stops. Conversely,
If the relationship between the boat speed and the rudder angle is below the anti-fall function stop curve, the anti-fall function continues to be exerted.

Further, after the anti-rolling function has been stopped by the determination of the anti-rolling function stop judging device 8, it is determined whether or not the anti-rolling function stop judging device 8 exerts the anti-rolling function again by the ship speed. This is performed based on the anti-rolling function stop curve determined from the relationship with the steering angle.

Since the anti-rolling function stop curve varies depending on the type of rudder, the rudder area, and the like, it can be obtained in advance by an estimation calculation or by performing a turning test during sea operation.

In this case, the boat speed detecting device 6 and the steering angle command device may be selected in the same manner as in the first method.

Next, a third method for determining whether or not to continue the rocking function of the rocking water tank apparatus will be described. In addition to the boat speed signal and the steering angle command signal, the roll angle measurement data obtained from the rock detector 9 is statistically processed and input to the anti-rolling function stop determination device 8. If the threshold value is equal to or greater than a preset threshold value (for example, 10 degrees or more), the anti-tilt function is continued to be exerted even if the boat speed signal and the steering angle command signal are in a condition for stopping the anti-tilt function. . In this case, an inclinometer, a gyro device, or the like may be used as the swing detector 9.

Next, a fourth determination method for determining whether or not to continue the rocking function of the rocking water tank apparatus will be described. As a weighted average value of the roll angle measurement data obtained from the rocking detector 9,
The initial inclination angle {hull heel angle: generally, the right inclination is (+) and the left inclination is (-)} is calculated. Therefore, if the initial inclination angle is a predetermined value or more, the hull depends on the turning direction. The change of the lateral inclination angle is determined, and it is determined whether or not the rocking function of the rocking water tank apparatus is stopped. That is, when the ship has an initial inclination angle {for example, starboard (+) 3 degrees or more}, when performing a right turn, the hull tilts to the port side (−), so that the ship is turned. It is determined that the increase in the lateral inclination angle acts to eliminate the initial inclination angle, and the anti-oscillation function of the anti-oscillation tank device is continuously exerted. In the case of turning left, since the hull tilts to starboard, it is determined that the increase of the side tilt angle accompanying the turn is added to the initial tilt angle, and it is determined that the hull side tilt angle becomes excessive, Stop the anti-roll function.

Next, a method of continuing or stopping the rocking function in the rocking water tank apparatus of the present invention (hereinafter, simply referred to as an operation method of the rocking water tank apparatus) will be described with reference to the flowchart of FIG. First of all, the method of operating the anti-roll tank device is
In step S1, the air damper 4 of the anti-oscillation water tank device is opened, and the operation is started so as to suppress the lateral sway by applying the oscillating moment of the oscillating fluid W in the tanks 1a and 1b. In step S2, output signals from the boat speed detecting device 6, the steering angle command device (steering stand or autopilot device) 7, and the rocking detector 9 are input to the rocking function stop determining device 8.

In step S3, it is determined whether or not the air damper 4 of the rocking water tank device is open. If it is determined that the air damper 4 is open, the process proceeds to step S4. If it is determined that it is not open, Proceeding to step S9, it is determined whether the steering angle or the boat speed is equal to or less than a predetermined value.

In step S4, it is determined whether or not the average roll angle is equal to or greater than a predetermined threshold value β1. If the average roll angle is equal to or greater than the predetermined threshold value β1, the process proceeds to step S12, where the air damper Continue opening 4. On the other hand, if the average roll angle has not reached the predetermined threshold value, the process proceeds to step S5, where it is determined whether the initial inclination angle (for example, the starboard inclination of 3 degrees or more) and the turning direction of the ship are the same, and If the directions are the same (turn right), the process proceeds to step S12. If the turning direction is different from the initial inclination angle, the process proceeds to step S6.

In step S6, the ship speed value is set to the predetermined threshold value γ1.
(For example, 12 knots) or more, and when the boat speed value is equal to or more than the predetermined threshold value γ1, the process proceeds to step S7, and the steering angle command signal value is set to the predetermined threshold value α1 (for example, 20 degrees).
It is determined whether or not the above is true. If the steering angle command signal value is equal to or more than the predetermined threshold α1, the process proceeds to step S8. FIG. 3 shows an example showing the relationship between the boat speed and the threshold value of the steering angle command signal in steps S6 and S7. In step S8, the air damper 4 of the rocking water tank device is shut off. Note that the process returns to step S2 while the conditions of steps S6 and S7 are not satisfied.

Subsequently, in step S9, the operation stop release determination is made in a state where the anti-roll tank device stops operating.
It is determined whether the steering angle command signal or the boat speed is below a predetermined value. When the steering angle command signal or the boat speed is less than the predetermined value,
(For example, when the boat speed value has decreased by approximately 30% of the predetermined threshold value γ1 and the steering angle command signal has decreased by approximately 30%, respectively)
Proceeding to step S10, if the steering angle command signal or the boat speed exceeds a predetermined value, the process returns to step S2. In step S10, it is determined whether or not the average roll angle is equal to or more than a predetermined value (for example, when the average roll angle becomes a value reduced by about 50% of the predetermined threshold value β1). ,
Proceeding to step S11, if the average roll angle is less than the predetermined value, the process returns to step S8.

In step S11, it is determined whether or not the average roll period is within the control range. If it is within the control range, the process proceeds to step S12.
It returns to step S8. In step S12, the air damper 4 is opened, and the operation of the anti-roll water tank device is started. Subsequently, the process proceeds to step S2, where it is determined whether or not the operation is to be terminated. If the operation is to be continued, the same operation is repeated. If the operation has ended, the control program ends.

Similarly, another operation method of the reduced water tank device of the present invention will be described with reference to the flowchart of FIG. In this operation method, the stop or the continuation of the anti-oscillation tank device is determined based on an anti-oscillation function stop curve determined by the relationship between the boat speed and the steering angle. First, in step S1, the air damper 4 of the anti-oscillation water tank device is opened, and the operation is started so as to suppress the lateral sway by applying the oscillating moment of the anti-oscillation fluid W of the anti-oscillation water tanks 1a and 1b. . In step S2, the boat speed detection device 6, the steering angle command device (steering stand or auto pilot device) 7,
The output signal from the rocking detector 9 is used to determine whether or not the rocking function is stopped.
To enter.

In step S3, it is determined whether or not the air damper 4 of the rocking water tank device is open. If it is determined that the air damper 4 is open, the process proceeds to step S4. If it is determined that the air damper 4 is not open, the process proceeds to step S4. Proceeding to S9, it is determined whether the steering angle or the boat speed is equal to or less than a predetermined value.

In step S4, it is determined whether or not the average roll angle is equal to or greater than a predetermined threshold value β1. If the average roll angle is equal to or greater than the predetermined threshold value β1, the process proceeds to step S11, where the air damper Continue opening 4. On the other hand, if the average roll angle has not reached the predetermined threshold value, the process proceeds to step S5, where it is determined whether or not the initial inclination angle (for example, the starboard inclination of 3 degrees or more) and the turning direction of the ship are the same, and If the directions are the same (turn right), the process proceeds to step S11. If the direction is different from the initial inclination angle, the process proceeds to step S6.

In step S6, it is determined whether or not the boat speed signal and the steering angle command signal exceed the anti-rotation function stop curve. If not, the process proceeds to step S7. FIG. 5 shows an example of the anti-oscillation function stop curve, which is a criterion in step S6.

In step S7, the air damper 4 of the rocking water tank device is shut off. Note that the process returns to step S2 while the condition of step S6 is not satisfied.

Subsequently, in step S8, the determination of the cancellation of the operation stop is made in a state in which the operation of the rocking water tank apparatus is stopped.
It is determined whether or not the boat speed signal and the steering angle command signal exceed the anti-rolling function stop curve. If the ship speed and rudder angle command signal are below the lowering function stop curve that defines the lowering function stop range of the lowering tank apparatus determined from the relationship between the ship speed and the steering angle, the process proceeds to step S9. The process proceeds and returns to step S2 if it is above the anti-rolling function stop curve. In step S9,
It is determined whether or not the average roll angle is equal to or greater than a predetermined value (for example, when the average roll angle becomes a value reduced by about 50% of the predetermined threshold value β1).
The process proceeds to 0, and if it is less than the predetermined value, the process returns to step S7. In step S10, it is determined whether or not the average roll period is within the control range.
Proceeding to step S11, if the control range is exceeded, step S7
Return to In step S11, the air damper 4 is opened, and the operation of the anti-roll water tank device is started. Then, returning to step S2, it is determined whether or not to end the operation. If the operation is to be continued, the same operation is repeated. In the case of end of continuous rotation,
Terminate the control program.

As described above, in the anti-roll tank apparatus of the present invention, when the average roll angle is equal to or larger than the predetermined threshold, the anti-roll tank apparatus is independent of the boat speed and the magnitude of the steering angle command signal. Is maintained, and an increase in the maximum roll angle of the hull can be avoided in advance.

When there is an initial hull inclination, it is determined whether or not the hull lateral inclination angle is eliminated or increased according to the direction of turning, and the operation of the anti-tilt water tank apparatus is maintained or stopped. Can be prevented from increasing in advance.

[0058]

According to the present invention, if it is determined that there is a possibility that the hull lateral inclination angle will increase if the anti-rolling function of the anti-rolling water tank apparatus is maintained, the anti-rolling function of the anti-rolling water tank apparatus will be described. Can be stopped, so that an increase in the hull lateral inclination angle can be avoided in advance.

Also, a ship speed signal transmitted from an existing speedometer (a boat speed log, a tidal current observation device, a GPS, or the like) or a steering angle command for driving a rudder transmitted from a steering stand or an autopilot device. By using the signal, it is possible to determine whether to stop the anti-rolling function of the anti-rolling tank device, so it is not necessary to add a new measuring device for detecting the ship speed and steering angle, It is possible to perform the safe operation of the rocking tank device at low cost.

When the average roll angle is equal to or larger than the predetermined threshold value, the operation of the anti-roll tank system can be maintained irrespective of the boat speed and the steering angle command signal. The increase can be avoided in advance.

When the hull has an initial inclination angle, the operation of the anti-roll tank device can be maintained or stopped depending on the turning direction, so that it is possible to avoid an increase in the hull lateral inclination angle in advance. It is possible to make the device function effectively without stopping the rocking water tank device unnecessarily.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of an embodiment of a vibration damping water tank device of a ship according to the present invention, in which (a) is a block diagram showing the entire configuration of the water damping water tank device, and (b) is a block diagram of the vibration damping water tank device. It is a perspective view of the part which exhibits a rocking | damping function.

FIG. 2 is a flowchart illustrating an operation method of the anti-rolling tank device for a ship according to the present invention.

FIG. 3 is a diagram showing a relationship between a boat speed and a threshold value of a steering angle for determining whether to stop or continue the operation of the rocking water tank device according to the present invention.

FIG. 4 is a flowchart illustrating another operation method of the anti-roll tank device for a ship according to the present invention.

FIG. 5 is a diagram showing a curve for stopping a rocking function determined from a boat speed and a steering angle for determining whether to stop or continue operation of the rocking water tank apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1a, 1b Tank 2 Communication waterway 3 Air duct 4 Air damper 5 Damper control device 6 Ship speed detection device 7 Steering angle command device 8 Decrease function stop judgment device 9 Swing detector

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomio Murata 3rd Bentencho, Tsurumi-ku, Yokohama-shi, Kanagawa NKK General Design Co., Ltd. (72) Inventor Yoshitaka Yahagi 3rd Bentencho, Tsurumi-ku, Yokohama-shi, Kanagawa N KK Sogo Design Inc.

Claims (8)

[Claims] 1. A pair of tanks installed on both sides of a ship,
A communication water passage for communicating the pair of tanks, an air duct connecting the pair of tanks, and an air damper provided in the air duct; when the air damper is opened, the air damper exhibits a rocking function; Closing the tank to stop the rocking function, the boat rocking tank device configured to stop the rocking function, a boat speed detecting means for detecting a boat speed of the boat equipped with the rocking tank device, and a rudder for instructing a steering angle of the boat. Angle commanding means, and a boat speed signal from the boat speed detecting means and a steering angle command signal from the steering angle commanding means for determining whether to stop the rocking function of the rocking water tank apparatus. A reduced water tank device for a ship, comprising: a rocking function stop determination unit; and an air damper control unit that controls opening and closing of the air damper according to a command from the rocking function stop determination unit. 2. The anti-rolling water tank device for a ship according to claim 1, wherein the steering angle commanding means for the ship is a steering stand or an auto pilot device for the ship. 3. The system according to claim 1, wherein the anti-falling function stop determining means determines that the anti-falling function is stopped when each of the boat speed signal and the steering angle command signal exceeds a certain value. The anti-rolling water tank device for a ship according to claim 1 or 2, wherein 4. After the anti-oscillation function is stopped by the judgment of the anti-oscillation function stop judging means, when each of the boat speed signal and the steering angle command signal decreases below a predetermined value, the anti-oscillation function is turned off. The anti-oscillation tank device for a ship according to claim 3, wherein the anti-oscillation function is re-executed by the function stop judging means. 5. The method according to claim 1, wherein the anti-falling function stop determining means determines whether or not to stop the anti-falling function based on the anti-falling function stop curve determined from the relationship between the boat speed and the steering angle. The anti-rolling water tank device for a ship according to claim 1 or 2, wherein: 6. After the lowering function has been stopped by the determination of the lowering function stop determining means, the determination as to whether the lowering function stop determining means exerts the lowering function again is made based on the boat speed and the steering angle. The anti-rolling water tank device for a ship according to claim 5, wherein the control is performed based on the anti-rotation function stop curve determined from the relationship with: 7. An average roll angle of the hull is input to the anti-rolling function stop determination means, and when the input average roll angle is equal to or greater than a predetermined value, a boat speed signal and a steering angle command signal are provided. The anti-oscillating function is exerted even when the condition for stopping the anti-oscillating function is satisfied.
7. The reduced water tank device for a ship according to 3, 4, 5, or 6. 8. An anti-rolling function stop judging means inputs a roll angle of a hull to calculate an initial tilt angle, and when the ship has an initial tilt angle equal to or more than a predetermined value, the anti-rolling water tank. 8. The apparatus according to claim 1, wherein the determination as to whether or not to stop the rocking function of the device is made based on the inclination direction of the initial inclination angle and the turning direction. 2. The anti-rolling water tank device for a ship according to item 1.