JPH1111386A - Method and device for preventing pitching and rolling of hull - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent both the pitching and the rolling when a hull is navigating or stopped by fitting a strut downwardly at an end part in the longitudinal direction of the hull, and fitting a movable hydrofoil which is turnable in the downward direction, and a fixed hydrofoil to be kept horizontal on the strut. SOLUTION: When a control part detects the rolling signal and activated, one hydrofoil 3 starts a driving mechanism, turns the hydrofoil 3 downward and sets it in the vertical condition. When the clockwise moment as indicated by the arrow R1 is exerted on a hull 1, the drag as indicated by the arrow F1 is exerted on the hydrofoil 3 to prevent the rolling of the hull 1. On the other hand, when the counterclockwise moment in the opposite direction is exerted, the drag in the opposite direction is exerted on the hydrofoil 3. When the hydrofoils 3, 3' are horizontal, and the clockwise moment as indicated by the arrow R2 is exerted on the hull 1, the upward force F2 thereagainst is exerted on the hydrofoil 3 to reduce the clockwise moment, and the hydrofoil works as a damper against the pitching.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration reducing device which exerts an effect on both pitching and rolling of a hull.

[0002]

2. Description of the Related Art As a technique for preventing pitching of a hull, a lift utilizing a fin is used in Japanese Patent Application Laid-Open No. 7-1995.
No. 228292 is disclosed.

[0003] The technique disclosed in this publication includes a strut which descends from the storage room near the end of the hull to a lower portion of the bottom of the hull by a lifting / lowering drive mechanism, and a pitching prevention fin mounted on the strut. The fin is moved up and down together with the strut by controlling a lifting drive mechanism via a control system based on a signal from a pitch sensor,
A lift is generated in the fin by the water flow flowing into the fin at an angle of attack corresponding to the direction of the combined vector of the moving speed of the fin in the vertical direction and the flow velocity, and the vertical motion of the hull is canceled by the moment due to the lift. It is.

[0004] Anti-rolling tanks have conventionally been put into practical use as a technique for preventing rolls when the hull is running and when the hull is stopped. However, since a space for accommodating the anti-roll tank is required in the hull. In addition, there is a problem that it cannot be used on a small boat because the amount of drainage increases.

Further, there is a technique for preventing the roll from rolling by fins provided on the side of the ship, but it is effective only at the time of sailing.

Accordingly, Japanese Utility Model Publication No. Hei 7-22395 discloses a technique for preventing roll even when the boat is stopped, using a rocking plate.

The technique disclosed in this publication is such that one end of the rocking plate is attached to a rocking plate support member provided on each side of the hull, and the whole rocking plate rotates vertically. Or, the other end portion of the damping plate is elastically deformed up and down to prevent rolling when the hull stops, so that the damping plate is stored in the side of the ship when sailing. It is composed.

[0008]

However, in the prior art disclosed in the above-mentioned Japanese Patent Application Laid-Open No. Hei 7-228292, which prevents pitching, the pitching caused by the water flow on the fin wing surface is caused by the pitching during sailing. Although it can be expected, in the case of pitching at the time of stopping the ship, no lift is generated by the water flow on the fin wing surface, so that only a damper effect due to vertical movement can be expected. Therefore, the effect of preventing pitching at the time of stopping the ship cannot be expected.

Also, the aforementioned Japanese Utility Model Laid-Open No. Hei 7-22395,
Although it is effective for rolling when the ship is stopped, it is not effective for preventing rolling and pitching during sailing.

As described above, there is a problem that the disclosed technology cannot exert an effect on both prevention of vertical sway and roll of the hull.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hull pitch and roll reduction device which can prevent pitch and roll when the hull is running and when the boat is stopped.

[0012]

A first means for solving the above-mentioned problem is to attach a strut downward at a longitudinal end of a hull, and to attach a movable hydrofoil rotatable downward to the strut and to a horizontal plane. A device for preventing pitching and rolling of a hull, comprising a fixed hydrofoil for maintaining the hull.

A second means for solving the above-mentioned problem is to provide a pair of struts in the width direction of the boat, to provide fixed hydrofoil between the insides of the struts of the pair, and to provide a downward facing strut at an outer end of the strut. The vertical and horizontal rocking and sway reducing device of the hull according to the first means, further comprising a rotatable movable hydrofoil.

According to the first and second means, when pitching is to be suppressed, if the hydrofoil is set in the horizontal direction, the hydrofoil functions as a damper for pitching, and Generates a pitching suppression moment.

Further, if the hydrofoil is rotated in the vertical direction, the moment of restraining the hull from rolling can be increased.

Further, according to the second means, since the fixed hydrofoil can be enlarged, a large damping effect can be exerted against pitching of the catamaran and the wide monohull.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a device for preventing pitching and rolling of a hull according to the present invention, wherein 1 is a hull, 1a is a bow portion of the hull 1, and 1b is a bottom.

Reference numeral 2 denotes a strut which extends vertically or obliquely from the bottom 1b of the hull 1 and has a hydrofoil 3, 3 'fixed to the tip of the strut 2 via a mounting portion 4.

One of the hydrofoils 3 is movable, and the other is fixed. FIG. 2 is a cross-sectional view of the hull pitching and rolling prevention apparatus according to the present invention as viewed from the front.

The strut 2 having the hydrofoils 3, 3 'attached to its tip is mounted vertically to the bottom 1b of the hull 1 and is mounted on a drive mechanism 5 inside the hull 1.

The drive mechanism 5 is a mechanism for rotating one of the hydrofoils 3, 3 'downward.

Reference numeral 6 denotes a control unit for controlling the driving mechanism 5, which drives the driving mechanism 5 in a direction in which the moment for suppressing the sway is effective by a signal relating to the sway of the hull from a tilt sensor and an acceleration sensor (not shown).

FIG. 3 is a front view showing a state in which the hull pitch and roll prevention device according to the present invention functions to prevent roll.

In FIG. 3, one hydrofoil 3 of the present invention is shown.
When the control unit 6 detects the roll signal and operates, the drive mechanism 5 is activated to rotate the hydrofoil 3 downward, and is set to a vertical state.

If a clockwise moment such as the arrow R ₁ acts on the hull 1, the hydrofoil 3 acts as the drag of the arrow F ₁ to prevent the hull 1 from rolling. Conversely, when a counterclockwise moment acts in the opposite direction, a drag in the opposite direction acts on the hydrofoil 3.

FIG. 4 shows the hydrofoil 3 and the hull 1 according to the present invention.
FIG. 4 is a side view illustrating a relationship with vertical swing of the vehicle.

[0028] In FIG. 4, hydrofoil 3,3 'are horizontal state, the hull 1 acts clockwise moment, such as an arrow R _2, hydrofoil 3, the direction of the force F on against it
₂ acts to reduce the clockwise moment and acts as a damper against pitching.

Conversely, when the pitching moment of the hull 1 acts in the opposite direction, a downward drag acts on the hydrofoil 3, 3 '.

FIG. 5 is a perspective view of a second embodiment in which the present invention is applied to a catamaran. In FIG. 5, struts 2a and 2b are respectively attached to the catamaran hulls 1c and 1d downward, and both ends of the hydrofoil 3 are supported at lower ends thereof via attachment portions 4a and 4b.
A fixed hydrofoil 30 is attached between the two.

One or both of the hydrofoils 3, 3 'are set and formed in a vertical state by being turned downward.

In the second embodiment, the fixed hydrofoil 3
By providing 0, a greater damper effect can be exerted against pitching.

The structure in which the struts 2a and 2b are provided as a pair to support the movable hydrofoil 3, 3 'and the fixed hydrofoil ship 30 can be applied to a single-hull hull and a wide hull.

FIG. 6 is a perspective view for explaining the function of the anti-rolling state when the present invention is applied to the catamaran.

In FIG. 6, the movable hydrofoil 3, 3 'is rotated and set in the vertical direction in response to roll, and exerts a damper function as described above.

FIGS. 7, 8 and 9 are front views showing the mounting state of the strut of the present invention.

FIG. 7 shows struts 2 a and 2 b of the hydrofoil 3.
Are provided vertically when viewed from the front.

FIG. 8 shows struts 2 a and 2 b of the hydrofoil 3.
However, when viewed from the front, it is provided in a C-shape and provided at an angle that opens downward. With this structure, the area of the hydrofoil can be increased.

FIG. 9 shows struts 2 a and 2 b of the hydrofoil 3.
However, when viewed from the front, it has a structure in which it is provided in an inverted U-shape and is narrowly provided in the constriction. With this structure, the area of the hydrofoil can be increased.

FIGS. 10, 11 and 12 are plan views of struts 2a and 2b supporting both ends of the hydrofoil 3 of the present invention, cut along the water surface line, showing an embodiment of the arrangement in the longitudinal direction of the hull.

FIG. 10 shows a state in which the struts 2a and 2b are arranged parallel to the center line of the hull.

FIG. 11 shows a structure in which the struts 2a and 2b are arranged so as to close forward with respect to the center line of the hull. With this structure, when the auxiliary wing is attached to the hydrofoil, the area of the auxiliary wing can be increased.

FIG. 12 shows a structure in which the struts 2a and 2b are arranged so as to open forward with respect to the center line of the hull. With this structure, the resistance acting on the struts 2a and 2b can be reduced.

[0044]

The present invention is as described above, so that it is possible to control not only pitching and rolling but also at the time of stopping the ship, not to mention at the time of traveling.

In the control, since only the hydrofoil is set to the vertical state, a simple device configuration is sufficient.

[Brief description of the drawings]

FIG. 1 is a perspective view of a device for preventing pitching and rolling of a hull according to the present invention.

FIG. 2 is a sectional view of the hull pitching and rolling prevention device according to the present invention as viewed from the front.

FIG. 3 is a front view showing a state in which the hull pitch and roll prevention device according to the present invention functions to prevent roll.

FIG. 4 is a side view illustrating the relationship between the hydrofoil and the pitching of the hull in the present invention.

FIG. 5 is a perspective view of a second embodiment in which the present invention is applied to a catamaran.

FIG. 6 is a perspective view illustrating a function in a roll-prevention state when the present invention is applied to a catamaran.

FIG. 7 is a front view showing an attached state of the strut of the present invention.

FIG. 8 is a front view showing an attached state of the strut of the present invention.

FIG. 9 is a front view showing an attached state of the strut of the present invention.

FIG. 10 is a plan view of struts supporting both ends of a hydrofoil according to the present invention, cut along a water surface line.

FIG. 11 is a plan view of struts supporting both ends of a hydrofoil according to the present invention, cut along a water surface line.

FIG. 12 is a plan view of struts supporting both ends of a hydrofoil according to the present invention, cut along a water surface line.

[Explanation of symbols]

 Reference Signs List 1 hull 1a bow 1b hull bottom 1c catamaran hull 1d catamaran hull 2 strut 2a strut 2b strut 3 hydrofoil 3 'hydrofoil 30 hydrofoil 4 mounting part 4a mounting part 4b mounting part 5 drive mechanism 6 control part

Claims (2)

[Claims] 1. A hull in which a strut is attached downward at a longitudinal end of the hull, and a movable hydrofoil rotatable in a downward direction and a fixed hydrofoil for maintaining the horizontal level are attached to the strut. Pitch and anti-roll device. 2. Struts are provided in pairs in the width direction of the ship, fixed hydrofoils are provided between the struts of the pair, and movable hydrofoils rotatable downward are provided at outer ends of the struts. 2. The device for reducing pitch and roll of a hull according to claim 1, wherein: