JPH0512395U - Swing angle change type stable fin - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to reduce the sway in a high-speed boat traveling at high speed on the sea or the like, and to obtain a lift force that stabilizes the posture by a stable fin of a receding angle changing system. [Structure] Positioned on the X-axis that passes through the stern from the bow at right angles to the Z-axis related to the vertical line passing through the center of gravity of the ship, or X
Stable fins that are symmetrically positioned on the Y-axis orthogonal to the axis and are attached to the submerged parts of the hull, and the fins of the same shape on both sides are stretched in a straight line, or the fins on both sides are on the X-axis. The present invention relates to a retractable angle changing type stable fin that can be arbitrarily closed until it is superposed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a retractable angle type stability fin that is applied to a ship such as a high-speed boat traveling at high speed on the sea or the like to reduce its sway and stabilize the posture by generating a lift force by changing the retreat angle.

[0002]

[Prior Art]

 When a ship sails over the sea, waves force it to move vertically or horizontally. Excessive shaking can cause motion sickness, that is, sea sickness, which can cause serious discomfort to the crew, etc., and the cargo collapses and damages, and the onboard navigation electronic devices, etc. are adversely affected. .. For this reason, various devices have been developed to reduce the sway of ships, which is mainly caused by 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 (angle of attack) of this fin around the C axis to reduce shaking. 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. The lift force that causes fins is almost proportional to the angle of attack of the fins.Therefore, when the waves are high and the hull roll is large, the angle of attack is large, and on the contrary, when the waves are low and the roll is small. Is a type of fin that is widely used in container ships, passenger ships, escort vessels, etc. with speeds up to 30 knots, and reduces the horizontal vibration to a fraction of a number. Has the effect of

On the other hand, a ship such as a high-speed boat whose speed exceeds 30 knots is generally small, and therefore, even when sailing in the same wave, it is relatively shaken more than a container ship or a passenger ship. Although there is an urgent need to reduce shaking, there is almost no 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 becomes ignorable at a speed of 30 knots or more, and the resistance is large. This is because the power cannot be exerted.

As described above, it has been conventionally considered to provide a stabilizing fin on the bottom of a ship in order to prevent shaking and stabilize the posture of a high-speed boat during high-speed cruising. However, when this type of fin is attached, the resistance due to the protrusion becomes large, and high-speed performance is sacrificed even when it is not necessary to perform shaking control by sailing on a calm sea surface with low waves. There were some disclosures such as the problem that a problem occurred and the stable fins could be attached and detached, and the storage type was changed so that the fins could slide in the C-axis direction in Fig. 8, but it should be applied to high-speed boats where space and weight are limited. Was not practical and was hardly used.

[0006]

[Problems to be solved by the device]

 The present invention has been made in view of such circumstances, and has improved the method of controlling the angle of approach of the fin to reduce the sway of the ship and various other means for reducing the sway and stabilizing the posture. The stability fins, which have never been equipped, are changed to the receding angle changing method to obtain more effective results in terms of motion reduction and posture stabilization than any of the conventional ones.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a. It is located on the X-axis that passes through the stern from the bow perpendicular to the Z-axis related to the vertical line passing through the center of gravity of the ship, or symmetrically on the Y-axis that intersects the X-axis at the submerged parts of the ship. A stable fin that can be attached b. The same-shaped fins on both sides are stretched in a straight line on the Y-axis through a rotary actuator, or can be arbitrarily closed until the fins on both sides overlap on the X-axis. C. The retractable angle change type stable fin is established as the gist.

[0008]

[Action]

 Both fins produce a force opposite to the pitching or rolling motion, especially by tensioning, blocking, or overlapping of both fins, the velocity is not significantly reduced depending on the degree of wave, and the posture is reduced to reduce the vibration. It has a stabilizing effect.

[0009]

【Example】

 1, 2, and 3 are a side view, a bottom view, and a rear view, respectively, showing a state in which two stabilizing fins are attached to the submersible part of the hull, and FIGS. 4, 5, 6, and 7 are respectively. FIG. 8 is an explanatory view showing the arrangement of stable fins, and FIG. 8 is an explanatory view showing a conventional stable fin.

1, 2, and 3 show a high-speed boat equipped with two sets of stabilizing fins according to the present invention. Reference numeral 1 is a high-speed boat hull, 2 is a cockpit, and 3-8 are stable fins. , 9 show a streamlined rectifying cover for accommodating the stable fin, 10 shows a hydraulic or electric rotary actuator for changing the receding angle β of the stable fin, and 11 shows a controller. Of the fins, the fins 3 and 6 located outside the rotary actuator have an upward warp on the wing surface, and conversely, the fins 4 and 5 located inside the fins are opposite to the wing surface. The warp is downward.

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 to each other 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 stored state, lift force is not generated and, as a result, a force to raise the stern is applied.

On the contrary, as shown in FIG. 5, when 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, Exerts a force to lower the stern. In this case as well, the sweepback angle β is controlled by the control device 11.

The relationship between the fin operation and the shake control method is shown in FIG. 4, FIG. 5, FIG. 6 and FIG. That is, when the fin is attached to the stern of the high-speed boat, Fig. 4 shows the receding angle that causes the pitching moment that lowers the bow, and Fig. 5 shows the receding angle that generates the pitching moment that raises the bow. 6 has a receding angle for lowering the port, and FIG. 7 has a receding angle for lowering 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 the starboard side of the boat, but only the pitching is possible. Alternatively, if only roll is to be controlled, the objective can be achieved by installing a pair of stabilizing fins on the hull centerline. Although FIGS. 1 to 7 have described the method of changing the receding angle β in the range of 0 ° to 90 °, the same is true even if the receding angle β is changed to the range of 0 ° to 90 °, that is, not moving backward but moving forward. The effect is obtained.

According to the present invention, as shown in FIGS. 1 to 3, it is possible to store two fins having different warps in two stages so that upward and downward forces can be generated. The same effect can be obtained by changing the receding angle of one flat plate fin, which has been given an attack angle in advance, from 0 ° to 180 °.

A streamline-shaped straightening cover represented by reference numeral 9 in FIG. 1 accommodates a fin when the receding angle β is 90 °, has a small front surface 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, so in this case there will be no protrusions from the hull, and deterioration of high-speed performance due to the attachment of the stable fins will be eliminated. If the inboard arrangement permits, a direct-acting actuator is used instead of the rotary actuator represented by reference numeral 10 in FIG. 1 to change the receding angle of the fin.

[0019]

[Effect of the device]

 The stabilizing fin according to the present invention has the following advantages when applied to a high-speed boat as compared with 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 surface of the sea where the waves are low and there is no need to control the motion of the hull, if the receding angle of the stable fin is set to 90 °, the fin will be stored in the hull, and the protrusions from the hull It is virtually eliminated, and therefore the increase in drag that is detrimental to high-speed cruising is 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 it can be mounted on a small high-speed boat at high speed. It is possible to control the motion of the boat without sacrificing performance. (D) Even if the fin area is small, the fin functions well and the manufacturing cost and workability are good. This is an extremely useful device having such advantages.

[Brief description of drawings]

FIG. 1 is a side view of a stabilizing 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 9 Rectifying covers 10 Rotating actuators 11 Control device

Claims (1)

[Scope of utility model registration request] Claims: 1. Positioned on the X-axis that passes through the stern from the bow at right angles to the Z-axis related to the vertical line passing through the center of gravity of the ship, or symmetrically on the Y-axis at right angles to the X-axis. 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 through a rotary actuator, or the fins on both sides are superposed on the X-axis. Stable fins that change swept-back angle, which can be freely closed up to.