JPH0732376Y2 - Swing angle change type stable fin - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial field of application] The present invention is applied to a ship such as a high-speed boat traveling at high speed on the sea to reduce its sway and stabilize the posture. Variable stability fins.

[0002]

2. Description of the Related Art When a ship sails over the sea, it is forced to move vertically or horizontally due to waves. If the shaking becomes excessive, motion sickness, that is, sea sickness will occur and it will not be uncomfortable to give crews a great deal of discomfort, and the cargo will collapse and be damaged,
The navigation electronic equipment etc. onboard will be adversely affected. For this reason,
Various devices have been developed to reduce the sway of a ship, mainly rolling, and stable fins, whose effects are widely recognized, are widely used.

As shown in FIG. 8, a conventional stable fin projects a wing-shaped fin from a portion corresponding to a corner of a cross section of a ship, and changes the angle of this fin (greeting angle) around the C axis to reduce shaking. It is intended. That is, the moment about the B-axis generated by the lift generated according to the angle of attack is added in the direction in which the rolling is reduced. Since the lift generated by the fins is almost proportional to the angle of attack of the fins, when the waves are high and the hull roll is large, the angle of attack is large, and conversely, when the waves are low and the roll is small. Is a type of fin that is used to control shaking by taking a small angle of attack. This type of fin is widely used in container ships, passenger ships, escort vessels, etc., with speeds up to 30 knots, and reduces rolling in a fraction of a fraction. Have an effect.

On the other hand, a ship such as a high-speed boat whose speed exceeds 30 knots is generally small, and even when sailing in the same wave, it is swayed because it is relatively shaken compared to a container ship or a passenger ship. Although there is an urgent need to reduce the above, there is almost no actual record of installing the above-mentioned stabilizing fin. The reason for this is that the resistance component of the protrusion from the hull that can be ignored at a speed of 30 knots or less cannot be ignored at a speed of 30 knots or more, and the resistance is large. This is because the

As mentioned above, it has been considered in the past to provide a stabilizing fin at the bottom of the boat in order to prevent shaking and stabilize the posture of a high-speed boat during high-speed cruising. However, when this kind of fin is attached, the resistance due to the protrusion becomes large, and high speed performance is sacrificed even if it is not necessary to perform shaking control by sailing on a calm sea surface with low waves. Figure 8
There was also a disclosure such as changing to a retractable type in which the fin slides in the C-axis direction, but it was not practical to apply it to a high-speed boat with limited space and weight, and it was hardly practically used.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a method for controlling the angle of approach of a fin to reduce the sway of a ship and various other means for reducing the sway and stabilizing the posture. In order to obtain a more effective result in terms of sway reduction and posture stabilization than any of the conventional ones, the stability fins that were rarely equipped until now are changed to the receding angle change method. To do.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a. Z related to the vertical line passing through the center of gravity of the ship
Stabilizing fins that are located on the X axis that passes through the stern from the bow at right angles to the axis, or that are symmetrically positioned on the Y axis that is orthogonal to the X axis and that are attached to the submerged portion of the hull, respectively. B. Same-shaped fins on both sides
It is stretched in a straight line on the axis, or the fins on both sides are X-shaped.
Can be occluded arbitrarily until polymerized on the axis c. The retractable angle change type stable fin is established as the gist.

[0008]

[Action] Both fins generate a force opposite to the pitching or rolling motion, and in particular, tension, blockage, and stacking of the wings reduce the vibration without significantly reducing the speed according to the degree of wave. It has the effect of stabilizing the posture.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1, 2 and 3 are a side view, a bottom view and a rear view showing a state in which two stable fins are attached to a submersible portion of a ship, respectively, and FIGS. 7 is an explanatory view showing the arrangement of the stable fins, and FIG. 8 is an explanatory view showing a conventional stable fin.

FIGS. 1, 2 and 3 show a high speed boat according to the present invention having two sets of stabilizing fins attached. Reference numeral 1 is a high speed boat hull, 2 is a cockpit, and 3 to 8 are stable fins. , 9 are streamlined rectifying covers for accommodating the stable fins, 10 are hydraulic or electric rotary actuators for changing the receding angle β of the stable fins, and 11 are control devices. Of the fins, the fins 3 and 6 located on the outer side of the rotary actuator have an upward warp on the wing surface, while the fins 4 and 5 located on the inner side of the fin are warped on the wing surface. Is facing down.

The stabilizing fin according to the present invention is located on the X-axis which passes through the stern from the bow at right angles to the Z-axis which is perpendicular to the vertical line passing through the center of gravity of the ship, or on the Y-axis which is perpendicular to the X-axis. They are located symmetrically and are attached to the submerged parts of the hull. Therefore, at least one set is usually installed and two or more sets are installed.

The stability fin according to the present invention is characterized in that the receding angle β can be changed. Now, as shown in FIG. 4, when the receding angles β of the fins 3 and 6 are 0 ° and the receding angles β of the fins 4 and 5 are 90 ° C., that is, when the accommodation state is set, the blade surfaces of the fins 3 and 6 are Due to the warp, an upward force is applied by the both fins. On the other hand, since the fins 4 and 5 are in the housed state, they do not generate a lift and, as a result, a force to raise the stern is applied.

On the contrary, as shown in FIG. 5, if the receding angles β of the fins 4 and 5 are set to 0 ° and the receding angles β of the fins 3 and 6 are set to 90 °, that is, the retracted state, the hull is not The force to lower the stern is added. Also in this case, the sweepback angle β is controlled by the control device 11.

The relation between the operation of the fin and the control method of the shake is as follows.
This is as shown in FIGS. 4, 5, 6, and 7. That is,
When the fin is attached to the stern of the high-speed boat, FIG. 4 shows a swept-back angle that causes a pitching moment to lower the bow.
Is a receding angle that generates a pitching moment to raise the bow, and Fig. 6 is a receding angle that lowers the port side.
Fig. 7 shows a receding angle that lowers the starboard.

When the receding angle β shown in FIG. 2 is changed from 0 ° to 90 °, the lift force that causes the fin changes at a rate of approximately cos ² β, and when the large swing is suppressed, β is made small and small. When controlling the shake, β is set large.

Since the stabilizing fins shown in FIGS. 1 to 7 are intended to control pitching and rolling simultaneously, two sets of stabilizing fins are arranged on the port side and starboard side of the boat, but only pitching or If only roll is to be controlled, the objective is achieved by providing a set of stabilizing fins on the hull centerline. 1 to 7 describe the method of changing the receding angle β in the range of 0 ° to 90 °.
The same effect can be obtained by changing the range to 0 °, that is, moving forward instead of moving backward.

According to the present invention, as shown in FIGS. 1 to 3, two fins having different warps can be housed in two stages to generate upward and downward forces.
The same effect can be obtained by changing the receding angle of one flat plate fin, which is given a suitable angle of advance, from 0 ° to 180 °.

The streamlined rectifying cover represented by reference numeral 9 in FIG. 1 accommodates the fin when the receding angle β is 90 °, has a small frontal area, and has a small resistance itself. Is. Depending on the hull form of the high-speed boat, the hull itself can be used as a substitute, and in this case, there is no protrusion from the hull, and deterioration of the high-speed performance due to the attachment of the stable fin is eliminated. Further, if the arrangement in the boat allows, the receding angle of the fin is changed by using a direct acting actuator instead of the rotary actuator represented by reference numeral 10 in FIG.

[0019]

As described above, the stabilizing fin according to the present invention is applied to a high-speed boat and has the following advantages over the conventional stabilizing fin. (A) By changing the receding angle of the fin, not only the hull roll but also the pitch roll is reduced. (B) When sailing on the sea surface with low waves and it is not necessary to control the wobbling of the ship, if the receding angle of the stable fin is set to 90 °, the fin will be stored in the hull, so that protrusions from the hull It is virtually eliminated, and therefore the increase in resistance that is harmful to high-speed cruising can be minimized. (C) Since the swivel angle of the fin is controlled by a rotary actuator, it can be manufactured more compactly than the conventional stable fin with angle of attack control, and can be mounted on a small high-speed boat to achieve its high-speed performance. It is possible to control the shaking of the boat without sacrificing it. (D) Even if the area of the fin is small, the fin functions well and the manufacturing cost and workability are good. This is a very useful device having such advantages.

[Brief description of drawings]

FIG. 1 is a side view of a stable fin.

FIG. 2 is a bottom view of a stabilizing fin.

FIG. 3 is a rear view of the stabilizing fin.

FIG. 4 is an explanatory diagram showing an example of arrangement of stable fins.

FIG. 5 is an explanatory diagram showing an example of arrangement of stable fins.

FIG. 6 is an explanatory diagram showing an example of arrangement of stable fins.

FIG. 7 is an explanatory diagram showing an example of arrangement of stable fins.

FIG. 8 is an explanatory view showing a conventional stable fin.

[Explanation of symbols]

 1 High-speed boat hull 2 Cockpit 3 Stable fins 4 Stable fins 5 Stable fins 7 Stable fins 8 Stable fins 8 Stabilizing fins 9 Rectifying cover 10 Rotary actuator 11 Control device

Claims (1)

[Scope of utility model registration request] Claims: 1. Positioned on the X-axis line that passes through the stern from the bow at right angles to the Z-axis line of the vertical line passing through the center of gravity of the ship, or symmetrically on the Y-axis line that intersects at right angles with the X-axis line. Each of the stable fins is attached to the submerged portion of the hull, and the fins of the same shape on both sides are stretched in a straight line on the Y axis via a rotary actuator, or the fins on both sides are superposed on the X axis. Stable fins with variable swept angle, which can be freely closed up to.