JPH02193796A - Fin stabilizer control device for marine vessel - Google Patents

Abstract

PURPOSE:To make the title device economical by providing a control unit for performing automatic control of a fin when the fin operating cycle signal set automatically according to the position change of a hull on a run is longer than the preset operating cycle target value, and if shorter, fixing the fin to a specific angle. CONSTITUTION:The fin angle necessary for controlling the movement of a hull in a control unit 106 is memorized in time series, and when the fin switching space becomes smaller than the target value, the fin is fixed by sending the command of the preset fin angle. When the fin operating cycle becomes larger than the target value, the fin angle control is performed. The speed of a ship is thus automatically prevented from being lowered when the ship meets the violently changing head sea, and the saving of fuel cost as well as manpower can be promoted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fin stabilizer control device for a ship.

[Conventional technology]

Conventionally, the fin stabilizer control device for ships is
For example, as shown in the block diagram of FIG. 2, the movement 011 of the ship and the wave height 09 caused by an external force 010 such as waves are measured by an inclinometer 013. The voltage signal 015 measured by the sensor 014 and the wave height meter 012 is read by the control unit 016, where only a certain voltage signal is selected and sent as a servo valve operation signal, and after calculating the required fin angle, the servo valve 017 It is known to adjust the amount of oil and perform fin angle control 019 using a drive shaft 018.

However, in such a device, the fins are automatically controlled based on changes in the attitude of the ship during navigation, regardless of the control system response period, and therefore, there are the following drawbacks.

(1) When encountering rapidly changing slow waves, the control cycle becomes shorter, making it impossible for the control system response to follow, and excessive control increases the drag of the fins, resulting in a decrease in ship speed.

(2) Therefore, the fins are manually controlled by the crew's visual recognition of the waves, but manual control not only requires skill as it is based on visual judgment, but is also affected by individual differences. It cannot be used at night and posture control is difficult.

Therefore, when it seems that there are slow waves with rapid changes, the crew members will generally command the fins to be fixed at a specific angle based on their judgment, so the arrangement is necessary.

[Problem to be solved by the invention]

The present invention was proposed in view of these circumstances, and
To provide an economical fin stabilizer control device for a ship that automatically prevents a ship's speed from decreasing due to an increase in fin drag when the ship encounters rapidly changing slow waves.

[Means to solve the problem]

To this end, the present invention automatically controls the fins if the fin operating cycle signal, which is automatically set due to changes in the ship's attitude during navigation, is longer than a preset operating cycle target value, and if it is shorter than the operating cycle target value, the fins are automatically controlled. It is characterized by comprising a control unit that fixes the fins at a specific angle.

[Effect]

The fin angle required for attitude control is set according to attitude changes during navigation, and the average fin operating cycle for a certain set time is measured, then compared with a preset target value, and the fin angle is controlled based on the length of that cycle. Therefore, it is possible to perform optimal fin control according to the wave direction, and therefore, the ship's maneuverability can be improved by controlling the attitude and reducing drag.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a flowchart showing an example of a control unit according to the present invention. That is, in the present invention, a control unit having the program shown in FIG. 1 is employed as the control unit shown in FIG. 2.

In the flowchart in Figure 1, when the power is turned on, the control system such as various registers is initialized in step ``Initial processing'' 1, and then in step ``Read voltage signal'' 2.
Due to the hull motion.

The voltage signal of the wave height is read into the microcomputer via an A/D converter (not shown), and then in step 3, "Calculate fin angle", each digital signal is multiplied by a control constant to calculate the fin angle.

The fin angle and the fin switching interval are calculated by repeating the steps 2 and 3, ``reading the voltage signal'' and ``calculating the fin angle'' in time series.

Then, step "Fin switching period is smaller than target value" 4
, the fin switching cycle is compared with the target value, and if the fin switching cycle is smaller than the target value, step ``fix to fin angle setting value'' is set to step 5, and the fin switching cycle is larger than the target value. At this time, step "Fin angle control" 6 is performed, and one of the output signals is converted to an analog quantity by the D/A converter in step "Output control signal" 7, and the servo valve 017 (No. (See Figure 2).

That is, according to the present invention, in the control circuit shown in FIG. 2, the fin angles necessary for controlling the hull motion in the control unit are stored in the memory in time series, and the fin switching interval is smaller than the target value. In this case, the fins are fixed by sending a preset fin angle command, and when the fin operating cycle becomes larger than the target value, the fin angle is controlled.

According to such a device, when a ship encounters rapidly changing slow waves, it is possible to automatically prevent the ship's speed from decreasing, making it possible to save on fuel costs and manpower.

(Effects of the Invention) In short, according to the present invention, if the fin operation cycle signal that is automatically set due to changes in the ship's attitude during navigation is longer than the preset operation cycle target value, the fins are automatically controlled, and the fins are automatically controlled. Equipped with a control unit that fixes the fin at a specific angle if the period is shorter than the target value, it automatically prevents the fin from increasing drag and reducing the ship's speed when the ship encounters rapidly changing slow waves. The present invention is extremely useful industrially because it provides an economical ship fin stabilizer control device that prevents the fin stabilization from occurring.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing the operation of a control unit according to an embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of a known ship fin stabilizer control device. 1... Step "Initial processing", 2... Step "Read voltage signal", 3... Step "Calculate fin angle" 44... Step "Fin switching period is smaller than target value" , 5... Step "Fix to fin angle setting value", 6... Step "Fin angle control", 7
...Output the step 1 control signal."

Claims (1)

[Claims] If the fin operating cycle signal, which is automatically set based on changes in the ship's attitude during navigation, is longer than the preset operating cycle target value, the fins will be automatically controlled; if it is shorter than the operating cycle target value, the fins will be controlled at a specific angle. A fin stabilizer control device for a ship, comprising a control unit fixed to the fin stabilizer.