JPH04283193A - Multihull ship of three hulls or more - Google Patents

Abstract

PURPOSE:To provide a catamaran which reduces the horse power of a main engine required for propulsion to a value lower than that of a conventional multihull of three hulls or more. CONSTITUTION:In a three-hull ship, a single hull 1a is arranged to the central part of a bow and hulls 1b and 1c are arranged to the port side and the starboard side of a stern part. The width of a half-submerged part 3 of which each of the single hulls 1a, 1b, and 1c is composed is maximized in the vicinity of a water surface and the width of the half-submerged part 3 is rapidly decreased from the vicinity of a water surface toward above. The width of a coupling part 4 is set to a value equal to the rapidly decreased width of the half-submerged part 3.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-hulled ship of three or more hulls that sails in waves.

0002

[Prior Art] Generally, in a catamaran ship that is connected together by two monohulls (tamahulls), there is a large wave interference between the two monohulls, and there is a speed range where wave-making resistance rapidly increases. It is known that there is. In particular, when sailing in a certain speed range determined by the twin-hull spacing, or passing through this speed range during acceleration or deceleration, the ship's hull tilts due to the movement of the point of application of fluid force, and a sudden increase in wave-making resistance occurs. can be seen. On the other hand, in multihull ships with three or more monohulls, by dispersing them into three or more monohulls,
The waves generated by each monohull are smaller, wave interference can be controlled by arrangement, and the distance traveled to the point of action of hydrodynamic force can be reduced, solving the above problems of catamarans. It is already known that it can be done.

On the other hand, in conventional catamarans, most of the displacement is occupied by a submerged body with an elliptical cross section, and the connecting portion that penetrates the water surface is wide. For this reason, there was a problem in that the synchronization period of the oscillation was short, the wave forcing force was large, and the oscillation during waves became large.

[0004] As a means for solving such problems, there is known a catamaran boat with an improved structure of a semi-submerged part and a connecting part, which is disclosed in Japanese Patent Application Laid-Open No. 2-182594. The catamarans disclosed in the above publication are as follows. Two single hulls arranged in parallel with a predetermined interval are connected together by one deck, and each of the two single hulls is connected to a semi-submerged part, and the semi-submerged part is connected to deck 2. The width of the semi-submerged part is the maximum width near the water surface, and the width of the semi-submerged part rapidly decreases upward from near the water surface, The width of the connecting part,
A catamaran (
(hereinafter referred to as "prior art 1").

FIG. 13 is a schematic side view showing a catamaran disclosed in Prior Art 1, and FIG. 14 is a sectional view taken along line AA in FIG. 13. As shown in the drawing, in the catamaran of Prior Art 1, each of two monohulls 1, 1 each consisting of a connecting part 4 and a semi-submerged part 3 arranged at regular intervals has a semi-submerged part. The width is maximum near 3. The width of the semi-submerged part 3 rapidly decreases upward from the vicinity of the water surface 6, while the width gradually decreases downward from the vicinity of the water surface to the bottom end. It is formed.

[0006] In the catamaran of Prior Art 1, the width of the single hull (the width of the half-submerged part) rapidly decreases upward from the widest part near the water surface, so that when the hull sinks into the water, The restoring force becomes smaller, the tuning period of the oscillation becomes longer, and the amplitude of the oscillation becomes smaller in the normal wave period. On the other hand, even if it enters the waves, the width of the single shell 1 decreases rapidly upward from the maximum width part, so the wave pressure acting on the upper surface of the single shell 1 than the maximum width part and the lower surface Since the vertical components of the wave pressure acting on the waves cancel each other out, the wave forcing force in the vertical direction is reduced, and the vibration amplitude is reduced, among other features.

[0007]

[Problems to be Solved by the Invention] As described above, in the field of catamarans, as disclosed in Prior Art 1 above, catamarans having a monohull that is effective in improving the rocking performance in waves have already been disclosed. However, something like this has not yet been developed for multihulls. Therefore, the purpose of this invention is to
To provide a multihull boat whose rocking performance in waves can be improved more than conventional multihull boats by improving the shape of the single hull of the multihull boat.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a three-piece structure in which at least three single hulls 1 arranged in parallel at predetermined intervals are integrally connected by one deck. In a multihull larger than a hull, each of the single hulls 1 is composed of a semi-submerged part 3 and a connecting part 4 that connects the semi-submerged part 3 to the deck 2, and the width of the semi-submerged part 3 is The width of the semi-submerged part 3 is formed to have a maximum width near the water surface, and the width of the semi-submerged part 3 rapidly decreases upward from the vicinity of the water surface, and the connecting part 4
It is characterized in that the width is formed to be the same width as the rapidly reduced width of the semi-submerged part 3.

Next, the present invention will be explained with reference to the drawings. FIG. 1 is a side view of a trimaran showing a first embodiment of the present invention, FIG. 2 is a front view, and FIG. 3 is a sectional view taken along the line B--B in FIG. 1. As shown in the drawings, three single shells 1a, 1b, and 1c arranged in parallel at predetermined intervals are integrally connected by one deck 2. The single hull 1a is arranged at the center of the bow. The single hulls 1b and 1c are arranged on the port and starboard sides of the stern. three mono-hulls 1a,
Each of 1b and 1c near the water surface of the semi-submerged part 3,
Its width is maximum. The width of the semi-submerged part 3 rapidly decreases upward from near the water surface, while the width gradually decreases downward from near the water surface to the bottom end in a "V" shape. It is formed. The connecting portion 4 is formed to be narrower than the maximum width portion of the semi-submerged portion 3 near the water surface, and to have a constant width. The attachment portion 5 between the connecting portion 4 and the deck 2 is formed in such a shape that the width of the connecting portion 4 increases rapidly toward the top.

[0010] Since the single hull width (width of the half-submerged part 4) rapidly decreases upward from the widest part near the water surface, the restoring force when the hull sinks into the water becomes smaller, and the synchronization of oscillations decreases. The period becomes longer and the amplitude of the oscillation becomes smaller in a normal wave period. On the other hand, even if it breaks into waves during waves, the single-hull 1a
, 1b, and 1c decrease rapidly upward from the maximum width part, so the wave pressure acting on the upper surface and the wave pressure acting on the lower surface of the single shells 1a, 1b, and 1c are greater than the maximum width part. Since the vertical components of the pressure cancel each other out, the wave forcing force in the vertical direction becomes smaller, and the amplitude of the vibration becomes smaller.

FIG. 4 is a side view of a trimaran showing a second embodiment of the present invention, FIG. 5 is a front view, and FIG. 6 is a sectional view taken along the line C--C in FIG. 4. As shown in the drawings, three single shells 1a, 1b, and 1c arranged in parallel at predetermined intervals are integrally connected by one deck 2. Single body 1a and 1b
are located on the port and starboard sides of the bow. The single hull 1c is located at the center of the stern. The trimaran of this embodiment also provides the same effects as the first embodiment.

FIG. 7 is a side view of a trimaran showing a third embodiment of the present invention, FIG. 8 is a front view, and FIG. 9 is a sectional view taken along the line DD in FIG. 7. As shown in the drawing, three single cylinders 1a, 1b having the same length are arranged in parallel at a predetermined interval.
1c are integrally connected by one deck 2. The single hulls 1a and 1c are arranged on the port and starboard sides of the hull. The single hull 1b is arranged at the center of the hull. The trimaran of this embodiment also provides the same effects as the first embodiment.

FIG. 10 is a side view of a four-hulled ship showing a fourth embodiment of the present invention, FIG. 11 is a front view, and FIG. 12 is an E-
It is an E-line sectional view. As shown in the drawing, four single cylinders 1a, 1b, 1c, 1 are arranged in parallel at predetermined intervals.
d are integrally connected by one deck 2. The single hulls 1a and 1b are arranged on the port and starboard sides of the bow. The single hulls 1c and 1d are arranged on the port and starboard sides of the stern. The same effects as in the first embodiment can also be obtained in the four-hull boat of this embodiment.

[0014] Although the embodiments have been described using trimaran and tetrahull ships as examples, it goes without saying that similar effects can be obtained in multihulls such as pentahulls and higher.

[0015]

[Effects of the Invention] As explained above, according to the present invention, at a certain speed determined by the twin-hull spacing, there is no sudden increase in wave-making resistance or sudden changes in the hull list, and the oscillation performance is excellent during cruising in waves. This provides an industrially useful effect of being able to provide a multi-hull or more than three-hulled vessel.

[Brief explanation of the drawing]

[Fig. 1] Side view of a trimaran showing a first embodiment of the present invention.

[Fig. 2] A front view of a trimaran showing the first embodiment of the present invention.

[Fig. 3] A sectional view taken along the line BB in Fig. 1 showing the first embodiment of the present invention.

[Fig. 4] Side view of a trimaran showing a second embodiment of the present invention.

[Fig. 5] Front view of a trimaran showing a second embodiment of the present invention.

FIG. 6 is a sectional view taken along the line C-C in FIG. 4 showing a second embodiment of the present invention.

[Fig. 7] Side view of a trimaran showing a third embodiment of the present invention.

[Fig. 8] Front view of a trimaran showing a third embodiment of the present invention.

FIG. 9 is a sectional view taken along the line DD in FIG. 7 showing a third embodiment of the present invention.

FIG. 10: Side view of a four-hull boat showing a fourth embodiment of the present invention.

FIG. 11 is a front view of a four-hull boat showing a fourth embodiment of the present invention.

FIG. 12: E- of FIG. 10 showing a fourth embodiment of the present invention;
E-line sectional view

[Fig. 13] Schematic side view showing the catamaran disclosed in Prior Art 1

[Fig. 14] Cross-sectional view taken along line AA in Fig. 13

[Explanation of symbols]

1, 1a, 1b, 1c, 1d Single body 2 Deck 3　Semi-submerged part 4 Connecting part 5 Mounting part 6 Water surface

Claims (5)

[Claims] Claim 1: In a three-hull or more multi-hull boat formed by connecting at least three single-hulls 1 in parallel with a predetermined interval and integrally connected by one deck, each of the single-hulls 1 is connected in half. It is composed of a submerged part 3 and a connecting part 4 that connects the semi-submerged part 3 to the deck 2, and the half-submerged part 3 has a maximum width near the water surface, and is directed upward from near the water surface. The width of the semi-submerged part 3 is formed so that it rapidly decreases, and the width of the connecting part 4 is
A multi-hulled ship of three or more hulls, characterized in that the width is the same as the rapidly reduced width of the semi-submerged part 3. [Claim 2] 3 arranged in parallel at a predetermined interval.
Three single hulls 1a, 1b, and 1c are integrally connected by one deck 2, with the single hull 1a located at the center of the bow, and the single hulls 1b and 1c located at the port and starboard sides of the stern. In a multi-hull ship having a shell or more, the monohulls 1a, 1b, 1
Each of c is composed of a semi-submerged part 3 and a connecting part 4 that connects the semi-submerged part 3 to the deck 2, and the width of the semi-submerged part 3 is the maximum width near the water surface, and The width of the semi-submerged part 3 is formed so that it rapidly decreases upward from near the water surface, and the connecting part 4
A multi-hulled ship having three or more hulls, characterized in that the width of the half-submerged part 3 is the same as the rapidly reduced width of the half-submerged part 3. [Claim 3] 3 arranged in parallel at a predetermined interval.
Three single hulls 1a, 1b, and 1c are integrally connected by one deck 2, and the single hulls 1a and 1b are placed on the port and starboard sides of the bow, and the single hull 1c is placed at the center of the stern. In a multi-hull ship having a shell or more, the monohulls 1a, 1b, 1
Each of c is composed of a semi-submerged part 3 and a connecting part 4 that connects the semi-submerged part 3 to the deck 2, and the width of the semi-submerged part 3 is the maximum width near the water surface, and The width of the semi-submerged part 3 is formed so that it rapidly decreases upward from near the water surface, and the connecting part 4
A multi-hulled ship having three or more hulls, characterized in that the width of the half-submerged part 3 is the same as the rapidly reduced width of the half-submerged part 3. [Claim 4] 3 arranged in parallel at a predetermined interval.
Three single hulls 1a, 1b, and 1c are integrally connected by one deck 2, and the single hulls 1a and 1c are placed on the port and starboard sides of the hull, and the single hull 1b is placed in the center of the hull. In the above multihull, the monohull 1a, 1b, 1c
Each of these is constructed of a semi-submerged part 3 and a connecting part 4 that connects the semi-submerged part 3 to the deck 2, and the width of the semi-submerged part 3 is maximized near the water surface, and The width of the semi-submerged part 3 is formed so as to decrease rapidly from the vicinity upwards, and the width of the connecting part 4 is formed to be the same width as the width of the semi-submerged part 3 that rapidly decreases. A multi-hull ship larger than the body. [Claim 5] 4 arranged in parallel at a predetermined interval.
The single hulls 1a, 1b, 1c, and 1d are integrally connected by one deck 2, and the single hulls 1a and 1b are placed on the port and starboard sides of the bow, and the single hulls 1c and 1d are placed on the stern. In a multi-hulled ship with three or more hulls arranged on the port side and starboard side, each of the single hulls 1a, 1b, 1c, 1d,
A semi-submerged part 3 and a connecting part 4 that connects the semi-submerged part 3 to the deck 2
The width of the semi-submerged part 3 is the maximum near the water surface, and the width of the semi-submerged part 3 rapidly decreases upward from near the water surface. A multi-hulled ship of three or more hulls, characterized in that the width is the same as the rapidly reduced width of the semi-submerged part 3.