JPS6338094A - Control for fin stabilizer - Google Patents

Abstract

PURPOSE:To economize fuel consumption and permit the sharp increase of restitutive force by controlling a control circuit for the countermeasure to rolling and a control circuit for the countermeasure to restitutive force which are installed into a controller, through the selective or proportional addition by a selecting switch or an adder. CONSTITUTION:A selecting switch 1d transmits the signal of a control circuit 1b for the countermeasure to rolling or a control circuit 1c for the countermeasure to restitutive force into a fin driving device 2 through a wiring 1e. The fin is controlled so that the rolling resistance is increased or the restitutive moment is increased by selecting the selecting switch 1d. The selecting switch 1d may be formed as an adder in which the output of the control circuit 1b for the countermeasure to rolling and the control circuit 1c for the countermeasure to restitutive force may be added without executing switching, and the addition rate can be varied automatically or manually. Further, since the need of using a water ballast is avoided, fuel economization is permitted.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for controlling a fin stabilizer.

[Conventional technology]

A fin stabilizer has conventionally been used as a roll prevention device for a ship. A fin drive device 02 is attached to each, and a fin shaft 06 whose base is rotatably supported by the fin drive device 02 and whose end extends outboard through the outer plate 05 having a curved portion.
The fin 07 fixed to the tip of the fin shaft 06, the power source device 08 provided on the inside of the ship, and the control device 01 cooperate to form the structure.

Now, as shown in the cross-sectional view of Figure 4, the hull 04 is (1
) ~ 6] ~ (1) The action of the fin stabilizer when the lateral movement of the condyle is repeated is as follows: First, the control device 01
is the angle of rolling motion.

Detecting angular velocity and angular acceleration, controlling the fin drive device 02 according to these signals, tilting the fin 07 via the fin shaft 06, and generating lift on the fin 07 in the water,
The rolling of the hull 04 is reduced by generating torque that resists rolling in the hull 04.

At this time, the fin lift force in the direction of reducing the roll angular velocity is mainly controlled to be obtained by tilting the fin 07 around the fin axis 06. Since the angular velocity is high, control is performed so that the anti-rolling hull moment obtained by the fins 07 at this time becomes almost the maximum.

In such a ship, in the cross-sectional view of Figure 5, the hull centerline indicated by the dashed-dotted line is at an angle α with respect to the vertical line indicated by the dashed-double line.
When the hull 040 is tilted by 1, the center of gravity G of the hull 040 is on the hull center line, and the center of buoyancy B of the hull 04 is at the center of gravity of the portion of the hull 04 below the water surface.

The metacenter M, which is the intersection of the vertical line passing through the center of buoyancy B and the hull center line, is the distance GM from the center of gravity G even if the angle α changes within a range where the inclination angle α of the hull 04 is relatively small. is almost constant.

Furthermore, when the hull 04 is tilted by an angle α, the weight i of the hull 04 acting on the center of gravity G and the buoyancy force acting on the center of buoyancy B are equal in magnitude, but the points of action are shifted and
The moment that causes the hull 04 of α to tilt, i.e.
A restoring moment occurs.

Furthermore, as ships consume oil in their bottom fuel tanks,
When the center of gravity G of the hull 04 rises, the distance GM becomes smaller, the righting moment decreases, making it difficult to right, and eventually the hull 04 may capsize. ballast water is injected into the ballast tank at the bottom of the ship.

However, this method has the following five drawbacks.

(1) Since ballast water is injected into the hull 04, the displacement of the hull 04 increases, hull resistance increases, and fuel consumption increases.

徨) Water is injected into the ballast tank to increase stability.
It takes a considerable amount of time to finish injecting water, making it impossible to make it in time in case of an emergency.

[Problem that the invention seeks to solve]

The present invention was proposed in view of these circumstances, and
The object of the present invention is to provide a fin stabilizer control method that can reduce fuel consumption and increase stability in an emergency.

[Means for solving problems]

To this end, the present invention provides a control circuit for preventing rolling provided in a control device in a method of controlling a fin stabilizer including a control device, a power source device, a drive device, a fin shaft, a fin, etc.

It is characterized in that the control circuit for stability countermeasures is controlled by selection or proportional addition using a changeover switch or an adder.

[For production]

(1) The fin stabilizer can be used to prevent rolling, stability, or rain.

Value　　Stability can be obtained in an emergency.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a control device thereof.

First, in Fig. 1, 1a is a rolling sensor that detects the rolling angle, angular velocity, and angular acceleration of the hull 04 and transmits them as signals, and 1b is a rolling sensor that calculates a command fin angle according to a calculation program based on the rolling signal. In the control circuit for countermeasures against rolling, a control circuit proportional to the rolling angular velocity is mainly incorporated in the control circuit 1b for countermeasures against rolling.

1C is a stability countermeasure control circuit that calculates a command fin angle according to a calculation program based on a roll signal, and the stability countermeasure control circuit 1c mainly incorporates a control circuit proportional to the roll angle.

1d is a changeover switch that transmits a signal from the rolling countermeasure control circuit 1b or the stability countermeasure control circuit 1C to the fin drive device 2 via the wiring 1et-, and 1 is a control device constructed by cooperation of 1a to 1e. be.

In such a device, by switching the changeover switch 1d, the fins 07 can be controlled to increase the rolling resistance, or the fins o7 can be controlled to increase the righting moment.

Next, as a modification of the changeover switch 1d, the output from the roll countermeasure control circuit 1b and the output from the stability countermeasure control circuit 1c are added without switching, and the addition ratio is changed manually or automatically. It may also be used as an adder that allows the light to shine.

Furthermore, although the present invention has been applied to a fin stabilizer, substantially the same effects can be obtained with a vibration reduction tank type stabilizer.

According to such a method, the following effects can be achieved.

(1) By using the fin stabilizer for stability measures, it is possible to avoid the use of water ballast, which makes it possible to save fuel and is economical.

(2) Stability measures can be implemented rapidly;
It can also be used in time in case of emergency.

〔Effect of the invention〕

In short, according to the present invention, in a method for controlling a fin stabilizer comprising a control device, a power source device, a drive device, a fin shaft, a fin, etc., a control circuit for countermeasures against rolling and a control circuit for countermeasures against stability are provided in the control device. The present invention is industrially significant because it provides a control method for a fin stabilizer that can reduce fuel consumption and increase emergency stability by controlling the fin stabilizer by selecting or adding it proportionally using a changeover switch or an adder. It is beneficial.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a cross-sectional view of a hull showing a known fin stabilizer, Fig. 3 is a plan view of Fig. 2, and Fig. 4 is a known fin stabilizer. Cross-sectional view of the hull showing the rolling situation of a ship equipped with
This figure is a cross-sectional view of the ship shown in FIG. 4, showing the initial stability of the ship. 1...Control device, 1a...Rolling sensor, 1b...
- Rolling countermeasure control circuit, 1C... Stability countermeasure control circuit, 1d... Changeover switch, 1e... Wiring, 2...
・Fin drive device. Sub-Agent Patent Attorney Tadashi Tsukamoto Collection 1 Illustration

Claims (1)

[Scope of Claim] A method for controlling a fin stabilizer comprising a control device, a power source device, a drive device, a fin shaft, a fin, etc., comprising: a control circuit for preventing rolling provided in the control device;
A method for controlling a fin stabilizer, comprising controlling a stability countermeasure control circuit by selecting or adding it proportionally using a changeover switch or an adder.