JP2006199163A - Anti-rolling water tank device for ship - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anti-rolling water tank device for a ship, avoiding an increase in heeling angle of a hull in a sudden turn of a ship. <P>SOLUTION: An anti-rolling water tank 1 includes: a pair of tanks 1a, 1b disposed on both gunwales of a ship; and a connecting water channel 2 connecting the tanks 1a, 1b to each other, and further includes: an air duct 5 connecting the tanks 1a, 1b to each other; and an air damper 6 controlling the movement or constraint of a rocking relaxing liquid W by its opening and closing. A ship speed detecting mens 9 for detecting the ship speed and a steering stand or an automatic pilot device 8 for outputting a rudder angle command signal of the ship are connected to a central processing control device 10, and the control device 10 includes an operation determination means 10b for determining whether or not the air duct 6 is cut off to constrain the movement of the rocking relaxing liquid W according to a ship speed of the ship speed detecting means 9 and the rudder angle command signal of the automatic pilot device 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a ship's shaking water tank apparatus capable of avoiding an increase in the hull lateral inclination angle, for example, when making a sharp turn in a ship provided with a rocking water tank apparatus.

  2. Description of the Related Art Conventionally, as a device for reducing the rolling of a ship, a water tank device using a water tank body with a U-shaped cross section is known. Ships equipped with a reduced water tank device can reduce rolling and can provide a comfortable ride and are widely used. This anti-vibration aquarium device exhibits a high anti-vibration effect when a phase lag of approximately 90 degrees occurs between the hull roll cycle and the oscillation relaxation fluid of the anti-vibration aquarium device. It is a device to do.

  On the other hand, it is also known that when a steady horizontal inclination of the hull occurs for some reason, the steady inclination increases due to the influence of the free liquid level of the vibration reducing water tank apparatus.

  As a technique for avoiding such a problem of the reduced water tank apparatus, for example, there is a technique disclosed in Patent Document 1 (hereinafter referred to as a conventional example). This conventional example detects a sudden turn of a ship and closes the air duct of the anti-vibration water tank apparatus to stop the movement of the oscillation relaxation fluid of the anti-vibration water tank body. It is.

In the [Best Mode for Carrying Out the Invention] item, the following Patent Document 2 filed by the present applicant is cited, and is described here.
Japanese Patent No. 3125141 JP-A-11-139386

  In the conventional anti-vibration aquarium device, when the ship makes a sudden turn, the centrifugal force always causes a steady lateral inclination toward the outside of the turning center. It moves to the outer side of the turning center and is in a shifted state. The tilt moment generated by this is added to the centrifugal force, and the hull lateral tilt angle is further increased. Therefore, a sudden turning of the ship is detected, and the shaking tank apparatus is stopped to avoid an increase in the hull lateral inclination angle.

  However, in the conventional example, the anti-stirring water tank device is stopped by detecting the rudder angle command and the ship speed signal when the ship makes a sudden turning action, so that the ship rolls during stormy weather. Because of the irregularity, when the reduced water tank device is stopped, the probability that the liquid stops at the position assumed in the conventional example is extremely low. For this reason, the stop position of the liquid inside the anti-vibration tank may not be constant, and conversely, it may stop at a position where the hull lateral inclination angle is increased.In the conventional example, when the anti-vibration tank is stopped in the waves, the hull In some cases, a problem such as an increase in the lateral inclination angle occurs.

  The present invention has been made in view of the circumstances as described above, and an object of the present invention is to provide a marine vessel tank apparatus that can reliably reduce an increase in the hull lateral inclination angle of a marine vessel when turning. Is.

  In order to solve the above problems, the present invention has the following features.

[1] A pair of tanks installed on both sides of a ship, a communication water channel for communicating the pair of tanks, an air duct for connecting the pair of tanks, and an air damper provided in the air duct, In the anti-vibration water tank device of the ship configured to exhibit the vibration reduction function when the air damper is opened and to stop the vibration reduction function when the air damper is closed,
Vessel speed detecting means for detecting the vessel speed of the vessel equipped with the agitated water tank, an autopilot device for instructing the rudder angle of the vessel, and a liquid level detection for detecting the liquid level of the oscillation relaxation liquid inside the pair of tanks Whether or not the anti-vibration function of the anti-vibration water tank apparatus is stopped by means of means, a ship speed signal from the ship speed detection means, a steering angle command signal from the autopilot, and a liquid level signal from the liquid level detection means And a rocking function stop judging means for judging whether or not, and when the rocking function is stopped, the air damper is shut off at the timing determined by the rocking function stop judging means from the liquid level signal. A water-reducing aquarium device for ships.

  In the present invention, a ship speed value obtained from a ship speed log (ship speed detector), a tidal current observing device, or a speed detector by GPS is input to a central processing control device, and a steering angle command signal output from an autopilot device. Is input to the central processing control unit, and the liquid level signal obtained from the liquid level detector such as a level gauge installed in a pair of tanks (hereinafter referred to as wing tanks) installed on both sides is input to the central processing control unit. Input, perform data processing, and determine whether or not to stop the operation of the shaking water tank apparatus.

  When it is determined that the operation has been stopped, the central processing unit determines the position of the vibration reducing liquid in the wing tank from the liquid level signal, and the liquid level is horizontal after the operation is determined (in this case, the ship is upright and floating) In this case, a signal for shutting off the air damper is output immediately after the liquid level of the wing tank inside the turning center moves to a higher level.

  Since the actual air damper closing requires a certain operating time after the shut-off signal is issued, the air damper is designed so that the liquid level inside the turning center is maximized when the air damper is closed in consideration of this operating time. Set the closing speed.

  In the present invention, when the ship speed and the rudder angle command signal are each equal to or greater than a predetermined value, the hull lateral inclination angle is reduced due to the diminishing effect (rolling angle reduction amount) by the diminishing water tank due to a sudden turn or the like. If it is determined that there is a possibility of increase, the air duct is shut off to restrain the movement of the rocking relaxation fluid, and the operation of the vibration reducing water tank apparatus is stopped. Although it depends on the ship type, for example, in the case of a small ship, when the ship speed is 12 knots or more and the steering angle command value reaches 20 degrees or more, the operation of the anti-vibration water tank apparatus is stopped. Immediately after the liquid level level of the sway mitigating liquid in the anti-vibration water tank determined from the liquid level detector such as the liquid level gauge has moved from the horizontal to the higher level of the wing tank in the center of the swivel By commanding the air damper to close and stopping at a position where the liquid level of the inner wing tank of the turning center becomes maximum after the required time for closing the air damper, the outer inclination angle of the turning center of the hull at the time of turning is set. It becomes possible to decrease.

  The duration of the turning center inward inclination can be obtained by performing various turning tests. The time required for closing the damper can be adjusted and set in consideration of the required duration of the inward slope.

  In the present invention, when the average roll angle is equal to or greater than a predetermined threshold in the operation state of the anti-vibration water tank apparatus, it is determined that the anti-vibration effect of the anti-vibration water tank apparatus can be expected regardless of the cause. By not stopping the operation of the water tank device, the hull maximum lateral inclination angle is prevented from increasing. For example, when observing that the average roll angle has reached about 12 degrees, even if the ship speed and rudder angle are equal to or greater than a predetermined value, the operation of the anti-vibration tank device is not stopped and In order to prioritize the rocking effect, a decision is made to activate the rocking aquarium system. If the average roll angle is assumed to be 40%, the average roll angle when the reduced tank is stopped is about 20 degrees, but the reduced tank is still in operation. The increase in the tilt angle when performing a sharp turn is a few degrees when the normal GM is used, so the maximum tilt angle is a quick turn with the average roll angle and anti-vibration tank operating. It is about 14.5 degrees, which is an increase of the tilt angle when the swaying is performed, and the maximum tilt angle is smaller when the anti-shake tank is not stopped.

  According to the present invention, when it is determined that there is a possibility that the shaking tank device may increase the hull lateral inclination angle, the operation of the shaking tank device can be stopped. It is a water tank device, and the determination of the operation stop is made by monitoring the ship speed, the steering angle command signal, and the liquid level of the vibration reducing liquid inside the vibration reducing water tank, and the operation stop is determined in consideration of those values. As a result, the water tank device can effectively function without being frequently shut down, and the liquid level of the wing tank inside the turning center stops near the maximum level when the sudden turning stops. Therefore, it is possible to reduce and avoid in advance that the hull lateral inclination angle increases outside the turning center.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a marine vessel tank apparatus according to the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an embodiment of a ship's anti-water tank apparatus according to the present invention. In the figure, an anti-vibration water tank apparatus includes an anti-rolling water tank (anti-rolling tank) 1 in which a rocking relaxation liquid W is introduced, an autopilot device 8 that outputs a steering angle command signal, and a ship speed detecting means that detects a ship speed. 9, a central control device 10, a storage device 11, a damper control device 12, a display device 13, a swing detector 14, a liquid level detection device 15, and the like. The tank 1 is provided with tanks 1a and 1b on the port side and starboard side of the hull, the tanks 1a and 1b are connected by a connecting water channel 2, and air flows above the pair of tanks 1a and 1b. An air duct 5 is provided. The air duct 5 is provided with an air damper 6 for blocking the air flow. In the connecting water channel 2, a damper 3 for preventing the movement of the rocking relaxation liquid W is provided.

  Furthermore, the details of the vibration-reducing water tank 1 will be described with reference to FIG. In the figure, tanks 1a and 1b are connected by three connecting water channels 2a, 2b and 2c to form a vibration-reducing water tank 1, and a rocking relaxation liquid W is introduced. There may be two or three or more connected water channels. The connecting water channels 2a and 2b are provided with dampers 3a and 3b that prevent the movement of the shock relaxation liquid W, and the dampers 3a and 3b are driven by the driving devices 4a and 4b. When both or one of the dampers 3a and 3b is closed, the movement of the oscillation relaxation liquid W in the anti-vibration water tank 1 is limited, and the movement cycle can be different.

  The air duct 5 is provided with an air damper 6 for blocking the air flow, and is opened and closed by a driving device 7. Therefore, when the air damper 6 is closed, the rocking relaxation liquid W that moves between the tanks 1a and 1b is restrained, and the effect of preventing an increase in the hull lateral inclination angle during a sudden turn or the like is exhibited. In the embodiment, the air damper is shut off so that the rocking relaxation liquid W stops in the vicinity of the maximum level where it has moved into the wing tank inside the turning center, so that the effect of further reducing the hull lateral inclination is also exhibited.

  By the way, there are some water tanks that connect the tanks to each other, or there are no dampers in the connection water channel. The risk of becoming increased. However, in the turbulent water tank of the present embodiment, there are two or more connected water channels, each of which has dampers 3a and 3b, and is operated by controlling the moving period of the rocking relaxation liquid W. It can be said that this is an anti-vibration water tank device that is extremely unlikely to have an adverse effect.

  Next, the central control apparatus 10 of the reduced water tank apparatus in this embodiment will be described. The central control device 10 operates based on a control program, and output signals from the autopilot device 8, the ship speed detection means 9, the swing detector 14, and the liquid level detection device 15 are input to the central control device 10. These signals are input to the statistical processing means 10a and the driving determination means 10b. The measured values and the prayer data processed by the statistical processing means 10a are stored in the storage device 11 and the analysis data is displayed on the display device 13 that also serves as the driving input / output device.

  The steering angle command signal is output from the autopilot device 8 and is input to the central controller 10 using the steering angle command signal for driving the steering machine. Further, as the ship speed detecting means 9, the ship speed is measured by a ship speed log (ship speed detector), a tidal current observing device, GPS or the like. As the swing detector 14, the roll angle of the hull is measured by an inclinometer or a gyro device. As the liquid level detection device 15, the liquid level is measured by a liquid level meter such as a float type, a radio wave type, and a capacitance type.

  In the statistical processing means 10a, the measurement data of the roll angle obtained from the shake detector 14 is processed, and the maximum roll angle, 1/10 maximum average roll angle, 1/3 maximum average roll angle, average roll The swing angle and the initial tilt angle (the hull heel angle) are calculated. Further, a rocking rate, a hull average roll cycle, a zero cross cycle, a standard deviation, and the like are calculated and displayed on the display device 13. For example, in the vibration reduction aquarium apparatus of this embodiment, the vibration reduction rate is displayed on the display device 13, so that the effect of the operation of the vibration reduction aquarium apparatus is not sensuous, and the vibration reduction effect of the vibration reduction aquarium apparatus is quantitative. There are advantages that can be grasped. The average roll angle and the initial tilt angle are used as criteria for determining whether to stop or continue the operation of the anti-vibration water tank device when the boat speed and the rudder angle exceed predetermined values.

  Next, a description will be given of a method for operating the anti-vibration water tank apparatus performed to avoid an increase in the hull lateral inclination angle in the anti-vibration water tank apparatus according to this embodiment. This operation method is an operation method that stops the function of the shaking tank under a predetermined condition. In addition, the normal operating method of the rocking water tank 1 in this embodiment is disclosed in Patent Document 2 filed by the present applicant. That is, according to the average hull rolling period from the statistical processing means 10a, the air damper (corresponding to the air damper 6) and the NO. 1 damper (corresponding to damper 3a) and NO. This is an operation method for controlling the opening and closing of the 2 damper (corresponding to the damper 3b) and controlling the swing moment by the swing relaxation fluid to eliminate the roll.

  First, the operation method of the anti-vibration water tank apparatus according to this embodiment will be briefly described. The driving method for avoiding an increase in the hull lateral inclination angle is that the steering angle command signal, the ship speed signal, and the liquid level signal from the autopilot 8, the ship speed detecting means 9, and the liquid level detecting device 15 are in the center. When the steering angle command signal and the ship speed signal are equal to or greater than a predetermined threshold value by the driving determination means 10b, the signal is processed by being input to the control device 10, and the average roll angle at that time is referred to In order to determine whether to stop or continue the operation of the anti-vibration water tank device, when stopping, the drive device 7 is driven via the damper control device 12, the air damper 6 is shut off, and The movement of the rocking relaxation liquid W is restrained and the operation of the vibration reducing water tank apparatus is stopped. The air damper 6 is shut off at the timing when the vibration relaxation liquid W is offset in the wing tank inside the turning center.

  The method of shutting off the air damper at the timing when the sway mitigating liquid W is offset in the wing tank inward of the center of rotation is, first, the value of the steering angle command signal (eg, ± voltage value of DC current, etc. The turning direction and the commanded steering angle can be obtained from a steering angle of 35 degrees in a left turn, 0 V in a steering angle of 0 degree, and +5 V in a right turn by a steering angle of 35 degrees. Next, the position of the vibration reducing liquid in the wing tank is obtained from the liquid level signal inputted from the liquid level detection device 15 to the central processing control device, and after the operation stop is determined, the liquid level is changed from horizontal to the inside of the turning center. Immediately after the liquid level in the tank has moved to the higher level, a signal to shut off the air damper is output.

  Since the actual air damper closing requires a certain operating time after the shut-off signal is issued, the air damper is designed so that the liquid level inside the turning center is maximized when the air damper is closed in consideration of this operating time. Set the closing speed.

  In this example, the air damper shutoff signal is output immediately after the liquid level is moved from the horizontal to the higher liquid level of the wing tank inside the turning center after the operation stoppage is determined. As the fastest, when the air damper is closed, the liquid level inside the swivel center is maximized. The set time difference for closing the air damper may be delayed from the timing immediately after moving in the direction.

  Further, in this embodiment, the liquid level detection device is provided in both wing tanks, but it may be installed in any one of the wing tanks. In this case, when the inside of the turning center is the installation side of the liquid level detection device, the stop operation is performed in the same procedure as described above. If the inside of the swivel center is opposite to the installation side of the liquid level detection device, the signal for shutting off the air damper is sent immediately after the liquid level moves from the horizontal to the lower level of the wing tank where the liquid level detection device is installed. If output, the same effect can be obtained.

  Next, an operation method for continuing the operation of the reduced water tank apparatus when the average roll angle obtained by the statistical processing means 10a is equal to or greater than a predetermined threshold will be described. That is, when the average roll angle is equal to or greater than a predetermined threshold (for example, 10 degrees or more), it is determined that a rocking effect by the shaking water tank device can be expected, and the rocking is reduced by the operation determination means based on the ship speed and the steering angle command signal. Even in the region where the operation of the water tank apparatus is stopped, the operation of the anti-vibration water tank apparatus is maintained, and the hull lateral inclination angle is prevented from increasing.

  Next, the operation method in the reduced water tank apparatus of FIG. 1 will be described with reference to the control program of FIG. In the operation method of the vibration reducing water tank apparatus, first, in step S1, the air damper of the vibration reducing water tank apparatus is opened, and the rocking moment of the rocking relaxation liquid W in the vibration reducing water tank 1 is applied to suppress the roll. So start driving. In step S2, the output signals from the autopilot device 8, the ship speed detection means 9, the swing detector 14, and the liquid level detection device 15 are processed, and statistical processing is performed by the statistical processing means 10a to obtain the steering angle. Measurement data and statistical data such as command signals, ship speed, roll angle, and liquid level of the left and right wing tanks are input to the operation determination means 10b. Steps S <b> 3 to S <b> 6 are processes in which the operation determination unit 10 b performs processing. In step S3, it is determined whether or not the average roll angle is equal to or greater than a predetermined threshold value β1, and 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 of the reduced water tank apparatus is opened. continue. On the other hand, if the average roll angle has not reached the predetermined threshold, the process proceeds to step S4.

  In step S4, it is determined whether or not the boat speed value is greater than or equal to a predetermined threshold γ1 (for example, 12 knots). If the boat speed value is greater than or equal to the predetermined threshold γ1, the process proceeds to step S5, and the steering angle command signal value is It is determined whether or not it is equal to or greater than a predetermined threshold value α1 (eg, 20 degrees). If the steering angle command signal value is equal to or greater than the predetermined threshold value α1, the process proceeds to step S6. An example showing the relationship between the threshold values of signals is shown in FIG. In step S6, from the turning direction and the liquid level signal determined from the steering angle command signal, is the liquid level of the wing tank inside the turning center increased from the horizontal (the liquid levels of the left and right wing tanks are equal)? Judging. When it has increased, it progresses to step S7, and the air damper 6 of a rocking water tank apparatus is interrupted | blocked, but when not increasing, it does not transfer to step S7 until it increases. Note that the process returns to step S3 as long as the conditions of steps S5 and S6 are not satisfied.

  Subsequently, in step S8, the determination of canceling the operation stop is performed by determining whether the rudder angle command signal or the boat speed is equal to or less than a predetermined value in a state where the operation of the reduced water tank apparatus is stopped. If the steering angle command signal or the boat speed is less than or equal to a predetermined value (for example, if the boat speed value is a value that is about 30% lower than the predetermined threshold value γ1 and the steering angle command signal respectively), go to step S9. move on. 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 is about 50% lower than the predetermined threshold β1). The process proceeds to step S10, where 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 S11. In step S11, the air damper 6 is opened, and the operation of the reduced water tank apparatus is started. Then, it progresses to step S12, it is determined whether a driving | operation is complete | finished, and when driving | running continues, it returns to step S3 and repeats the same operation. In the case of the end of continuous rotation, the control program is terminated.

It is a figure which shows the anti-vibration water tank apparatus of the ship which concerns on one embodiment of this invention. It is a figure which shows the detailed structure of the rocking water tank in FIG. It is a flowchart figure which shows the operating method of the anti-vibration water tank apparatus of the ship which concerns on one embodiment of this invention. It is a figure which shows the relationship between the threshold value of the boat speed and rudder angle for determining the stop or continuation of a rocking water tank apparatus operation | movement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anti-water tank 1a, 1b Tank 2, 2a, 2b, 2c Connection water channel 3, 3a, 3b Damper 4, 4a, 4b Drive device 5 Air duct 6 Air damper 7 Drive device 8 Autopilot device 9 Ship speed detection means 10 Center Control device 10a Statistical processing means 10b Operation determination means 11 Storage device 12 Damper control device 13 Display device 14 Swing detector 15 Liquid level detection device

Claims (1)

The air damper includes a pair of tanks installed on both sides of the ship, a communication water channel that connects the pair of tanks, an air duct that connects the pair of tanks, and an air damper that is provided in the air duct. In the ship's anti-vibration aquarium device configured to exhibit the anti-vibration function when opened and to stop the anti-vibration function when the air damper is closed,
Vessel speed detecting means for detecting the vessel speed of the vessel equipped with the agitated water tank, an autopilot device for instructing the rudder angle of the vessel, and a liquid level detection for detecting the liquid level of the oscillation relaxation liquid inside the pair of tanks Whether or not the anti-vibration function of the anti-vibration water tank apparatus is stopped by means of means, a ship speed signal from the ship speed detection means, a steering angle command signal from the autopilot, and a liquid level signal from the liquid level detection means And a rocking function stop judging means for judging whether or not, and when the rocking function is stopped, the air damper is shut off at the timing determined by the rocking function stop judging means from the liquid level signal. A water-reducing aquarium device for ships.

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