JPH04221290A - Device for restraining ship's heaving - Google Patents

Abstract

PURPOSE:To increase the wetted surface area of a ship's hull against waves to increase buoyancy, and enable a ship to stably navigate, in order to restrain the ship's heaving as one of causes for seasickness. CONSTITUTION:A fin 3 is provided on a ship's side shell just above and along the design water line (DWL), thereby restraining a ship's heaving effectively and keeping passengers free from seasickness.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a heaving suppressing device for a ship, and in particular, it increases the area of a ship in contact with waves to prevent heaving.
The present invention relates to a heaving suppressing device for a ship, which includes fins on the ship's side shell plate in order to suppress heaving.

0002

2. Description of the Related Art The motion of a ship includes up-and-down motion in the vertical axis direction and pitching caused by periodic changes in buoyancy when waves pass. In particular, vertical upward movement is called heaving, and downward movement is called dipping, and in general, the sudden ups and downs of the ship caused by pitching (pitching) and vertical rocking (heaving, including dipping) of the ship. is cited as a major cause of seasickness, and seasickness is particularly affected by heaving. In order to suppress the movement of a ship, a bilge keel has conventionally been provided in the bilge portion of the ship along the ship's ship direction. However, since the bilge keel is installed in the bilge part away from the metacenter, although it functions effectively against rolling, etc., the bilge keel does not allow for the heating that occurs due to periodic changes in buoyancy when waves pass. It did not actively reduce bing.

0003

[Problems to be Solved by the Invention] The applicant of the present invention has discovered that heaving is more likely to occur on ships with a small water contact area and low buoyancy, such as leisure boats, and has proposed that heaving may occur due to lack of buoyancy. I have come to the conclusion that this can be caused.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to increase the surface area of a ship in contact with waves to increase its buoyancy and thereby enable stable navigation of the ship, in order to suppress heaving, which causes seasickness.

[0005]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a fin along the planned full-load water line directly above the planned full-load water line of the ship's side shell plating.

[0006]

[Function] Fins increase the surface area of the ship in contact with the waves and increase the lift given by the waves. As a result, the buoyancy of the ship is substantially increased and the heaving is relatively low. In other words, heaving is substantially suppressed by the increase in buoyancy caused by the fins.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0008] Periodic changes in buoyancy when waves pass cause heaving, which increases the vertical movement and speed of the ship, and has a significant effect on seasickness of passengers.

[0009] Therefore, the present applicant installed fins on the ship's side shell plating to increase the surface area of the ship in contact with the waves and actively receive the lifting force from the waves, thereby increasing the buoyancy of the fins and increasing the ship's surface area.
We have devised a ship heaving suppression device that effectively suppresses heaving.

Specifically, the heaving suppressing device is constructed as shown in FIGS. 1 to 4.

As shown in FIG. 1, on both side shell plates 2 of the monohull 1, there are holes located directly above the planned load water lines D, W, and L.
Fins 3 are attached along the planned full-load water lines D, W, and L. The width and length of the fins 3 are determined to be such that the monohull 1 has a sufficient surface area in contact with the waves and a large lifting force due to the waves can be obtained. In the present invention, in order for the fins 3 to also function as fenders and to improve the ease of attachment and removal of the fins 3 to the ship's side shell plating 2, a plurality of fins made of a hard rubber material are used as shown in FIG. The fin segment 3a constitutes the fin 3. These fin division bodies 3a are attached to the side shell plate 2 by bolts 4 so as to be parallel to the planned load water lines D, W, and L as shown in FIG.
Attached by FIG. 4 shows an example in which the above-mentioned fin 3 is attached to a catamaran 5. As in the above embodiment, the fin 3 is connected to the planned load water line D and W of both hulls 6 and 7.
・Planned full load water lines D and W are placed on the ship's side shell plating 2 directly above L.
・It is integrally attached with bolt 4 along L.

Next, the operation of the ship heaving suppression device according to the present invention will be explained.

As shown in FIGS. 1 to 4, on the side shell 2 of the monohull 1 and catamaran 5, there are
In addition, the fins 3 provided along the planned full-load water lines D, W, and L have a sufficient contact area with respect to passing waves, so they receive appropriate lift from the waves and obtain sufficient buoyancy. . In other words, even when the influence of waves is large, sufficient lift can be obtained from the waves by the fins 3. As a result, the degree of pitching and pitching acceleration of the monohull 1 and catamaran 5 become relatively small, and heaving, which has conventionally been a cause of seasickness, is suppressed. The fins 3 also receive lift from the air during navigation, which is advantageous in terms of buoyancy.

Therefore, the heaving suppression device of the present invention suppresses heaving and eliminates the cause of seasickness. Incidentally, it is natural that a vessel having a small contact area with water, such as a leisure boat, be provided with fins 3 having a large contact area with water to ensure sufficient buoyancy.

[0015]

[Effects of the Invention] As is clear from the above explanation, the present invention exhibits the following excellent effects.

(1) Since the fins are provided directly above and along the planned full load water line on the side shell plating, it is possible to effectively suppress heaving and eliminate seasickness for passengers. can.

(2) The structure is simple and can be easily adopted.

[Brief explanation of the drawing]

FIG. 1 is a side view of a monohull boat according to the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a front view of FIG. 1;

FIG. 4 is a front view showing an example in which fins are attached to a catamaran according to the present invention.

[Explanation of symbols]

2　Ship side outer plate 3 Fin D・W・L Water line full of plans

Claims (1)

[Claims] 1. A heaving suppression device for a ship, characterized in that a fin is provided directly above and along the planned full-load waterline of the ship's side shell plating.