JPH026290A - Ship - Google Patents

Abstract

PURPOSE:To reduce the pitching and rolling of a hull by providing a stabilizer formed with cylindrical bodies which rotate on their axes on both side portions of a ship bottom. CONSTITUTION:Cylindrical bodies 3 which rotate in water to generate a force for controlling the posture of a hull 1 by a Magnus effect as a stabilizer are provided extending to obliquely lower portions on both side portions of the ship bottom 2 of the hull 1. The cylindrical body 3 is driven by an electric motor, etc. An end plate 8 having a slightly larger diameter than that of the cylindrical body 3 is integrally installed on the front end portion thereof to prevent the lowering of the efficiency caused by the generation of eddies on the end portions of the cylindrical bodies.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ship in which the structure of stabilizers provided on both sides of the bottom of the ship is improved.

[Prior Art] Ships are generally known in which stabilizers are provided on both sides of the bottom of the ship in order to suppress rolling, pitching, etc. of the ship's hull and enable stable navigation.

As shown in FIGS. 3 and 4, this stabilizer consists of fins 1 that are attached to both sides of the bottom 2 of the ship and extend diagonally downward.
By changing the angle of attack of the fins 10 with respect to the direction of fluid flow accompanying the propulsion of the hull 1, rolling of the hull 1 can be suppressed.

[Problems to be Solved by the Invention] However, with such a fin stabilizer, there is a problem in that when the attitude of the ship changes due to pitching, the angle of attack of the fin also changes, making it difficult to control the attitude of the ship. Also, as the pitching cycle becomes faster,
If the blade angle of the fins could no longer be controlled and the hydraulic switching valve was repeatedly operated violently, there was a risk that the switching valve would be damaged.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems and provide a ship that can easily control the attitude of the ship's hull unlike a fin stabilizer, and can easily perform follow-up operations even if the pitching cycle becomes faster. .

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a ship in which stabilizers are provided on both sides of the bottom of the ship, in which the stabilizers are constituted by cylindrical bodies that rotate around their respective axes. .

[Operation] When the ship is propelled while rotating the circle ftJ#, an upward or downward force is generated in the cylindrical body due to the Magnus effect depending on the direction of rotation, the number of revolutions, and the speed of the ship.

This force is generated in a direction perpendicular to the fluid flow accompanying the propulsion of the ship, and the magnitude of the force is determined by the speed of the flow (speed of the ship) and the rotational speed of the cylindrical body, so it is assumed that the attitude of the ship changes. However, unlike fin stabilizers, the direction and magnitude of the force do not change, making it easy to control the attitude of the ship.

In addition, since it is only necessary to control the rotational speed of the cylindrical body in response to pitching with a fast period that is expected during high-speed cruising, it is possible to easily follow up the pitching. It will not cause any damage.

[Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

In Figures 1 and 2, 1 is the hull of a ship, and on both sides of the bottom 2 there are diagonal cylindrical bodies 3 that act as stabilizers and rotate underwater to generate a force to control the attitude of the hull 1 due to the Magnus effect. It is provided so as to extend downward.

In order to rotationally drive the cylindrical body 3, a rotary drive device 6 consisting of a hydraulic or electric motor, a speed reducer, etc. is provided at the bottom of the hull 1, and extends diagonally downward through the bottom 2. The rotated rotation 11[17 is 7 of the cylinder 3! : The end shaft center is fixed. Further, an end grating 8 having a diameter slightly larger than that of the cylindrical body 3 is integrally attached to the distal end of the cylindrical body 3 to prevent a decrease in efficiency due to eddying at the cylindrical end.

The cylindrical body 3 is rotationally driven in the counterclockwise direction LA as shown by the arrow in FIG. 1 in response to the fluid flow R caused by the propulsion of the hull 1. On the other hand, a force FA in the upward direction at right angles is generated, and by being rotationally driven in the clockwise direction LB, a force FBfJ' in the downward direction at right angles to the fluid flow R is generated.

By controlling the rotation direction and rotation speed of the cylindrical bodies 3 on both sides, rolling and pitching of the hull 1 can be suppressed.

Next, the operation of the embodiment will be described.

If rolling or pitching of the hull 1 occurs during navigation of the ship, the cylindrical bodies 3 on both sides are rotationally driven by the rotary drive device 6 in order to suppress this.

The cylinder body 3 is rotationally driven in the counterclockwise direction LA as shown by the arrow in FIG. On the other hand, a force FA in a right angle upward direction is generated, and a force FB in a right angle downward direction is generated with respect to the fluid flow R by being rotationally driven in a clockwise direction LB. By controlling the rotation direction and rotation speed of the cylindrical bodies 3 on both sides, rolling and pitching of the hull 1 can be suppressed.

These forces FA and FB always occur in a direction perpendicular to the fluid flow R, and the magnitude of the force is determined by the speed of the flow (speed of the ship) and the rotational speed of the cylindrical body 3, so pitching causes the attitude of the ship 1. Even if they do not change, unlike the fin stabilizer, the direction and magnitude of the forces FA and F[3 do not change, and therefore the attitude of the hull 2 against pitching can be easily controlled. Furthermore, the force is not changed by changing the blade angle of the fin, but by changing the rotational speed of the cylindrical body 3, so the response is very good. In addition, in response to pitching with a fast period that is expected during high-speed navigation, it is only necessary to control the rotation speed without changing the rotation direction of the cylindrical body 3, so it is possible to easily follow the pitching. Unlike the fin stabilizer, the switching valve will not be damaged.

In particular, by controlling the rotation direction and rotation speed of the cylindrical bodies 3 on both sides, rolling and pitching of the hull 1 can be suppressed, improving navigation stability and comfort.

Note that the diameter, length, rotation speed, and material of the cylindrical body 3 are determined depending on the size and speed of the ship. Further, the surface of the cylindrical body 3 may remain smooth, but may be provided with a large number of small spherical recesses (dimples) as necessary.

In the embodiment described above, the cylindrical body 3 is arranged on both sides of the ship's bottom 2 so as to be inclined diagonally downward, but it may be arranged horizontally on both sides of the ship's bottom 2.

Also, in order to adjust the force generated by the cylindrical body 3,
The cylindrical body 3 may be configured to be movable in each axial direction from inside the hull 1, and the length of its protrusion from the bottom 2 may be changed. In this case, when the cylindrical body 3 is not needed, it may be drawn into a storage chamber formed inside the hull 1. ? Once the i-body 3 is drawn into the storage chamber, the opening of the storage chamber may be closed by the end plate 8 of the cylindrical body 3.

[Effects of the Invention] In short, according to the present invention, the stabilizers provided at both openings of the bottom of the ship are constructed of cylindrical bodies that rotate around their respective axes, so unlike fin stabilizers, the attitude of the ship against rolling and pitching is improved. It is easy to control, and even if the pitching period becomes faster, it can be easily followed, improving navigation stability and comfort.

[Brief explanation of the drawing]

FIG. 1 is a side view of a ship showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, FIG. 3 is a side view of a conventional ship, and FIG. FIG. In the figure, 1 is a hull, 2 is a bottom, and 3 is a cylindrical body.

Claims (1)

[Claims] 1. A ship provided with stabilizers on both sides of the bottom of the ship, characterized in that the stabilizers are constructed of cylindrical bodies that rotate about their respective axes.