JPH0319832B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a semi-submerged catamaran, and more particularly to a semi-submerged catamaran that can reduce wave impact on the bottom of the boat.

1 to 3 and 6 show a conventional semi-submerged catamaran in which a pair of left and right submerged bodies and an upper hull are each connected by one support.

Further, FIGS. 4, 5, and 7 show a conventional semi-submerged catamaran in which a pair of left and right submerged bodies and an upper hull are connected by two struts, respectively.

Furthermore, Figures 8 to 10 show a conventional semi-submerged catamaran in which a pair of left and right submerged bodies and an upper hull are each connected by one support, and a recess is formed on the lower surface of the center of the upper hull. There is.

Here, Figures 1, 4, and 8 are side views, Figure 3 is a top view, Figure 2 is a cross-sectional view taken along the - line in Figure 1, Figure 5 is a cross-sectional view taken along the - line in Figure 4, Figure 6 is a cross-sectional view taken along the - line in Figure 1 (only the cross-sectional shape is shown and internal details are omitted), and Figure 7 is a cross-sectional view taken along the - line in Figure 4 (only the cross-sectional shape is shown and the internal details are omitted). (details are omitted), FIGS. 9 and 10 are cross-sectional views taken along lines - and - in FIG. 8, respectively.

In Figures 1 to 10, numeral 1 indicates the upper hull;
1' is the lower surface of the upper hull, 2a and 2b are submerged bodies, 3
a, 3b, 3a', 3b' are pillars, 4a, 4b, 4
a', 4b' are pillar reinforcement parts, 5a, 5b are propellers,
6a, 6b are rudders, 7a, 7b are front hydrofoils, 8
a, 8b are the rear hydrofoils, 9 is the waterline, 10 is the cabin, 11 is the cockpit, 12a, 12b is the engine room, 1
3a, 13b are engines, 14a, 14b are propulsion shafts, 15a, 15b are vertical transmission shafts, 16a, 16
The horizontal transmission shafts b are 17a, 17b, 17a', 1
7b' is the first gear set, 18a, 18b, 18
a', 18b' are the second gear set, 19 is the bulwark, 20a, 20b, 20a', 20b' are the waves generated inside the catamaran, 21a, 21b, 21a', 2
1b' is the wave generated outside the catamaran, A is the wave 20
The superposition point of waves a and 20b, A' is the superposition point of waves 20a' and 20b', B is the superposition point after the waves 20a and 20b are reflected by the strut, and 22 is the recess provided on the lower surface of the center of the upper hull 1. The subscript a in each code indicates the port side, and the subscript b indicates the starboard side.

As shown in Figures 1 to 7, a semi-submerged catamaran has a pair of left and right submerged bodies 2a and 2b provided below the water surface.
and an upper hull 1 located above the water surface and having a large area.
The submerged bodies 2a and 2b penetrate through the water surface.
1 piece or 2 pieces each connecting the upper hull 1 and the upper hull 1.
It is composed of support columns 3a, 3b, 3a', and 3b'. Then, as shown in Figures 6 and 7,
The waterline area (the cross-sectional area of the struts at the waterline 9) of the struts 3a, 3b, 3a', and 3b' is characterized by being extremely small.

Since the semi-submerged catamaran is configured as described above, it is possible to reduce the forcing force of waves acting on the hull during waves, so that the hull movement is difficult to occur. In addition, since wave-making resistance can be reduced to reduce hull resistance in high-speed ranges, it has become possible to sail at high speed even in waves. However, because the waterline area is small and its vertical changes are small, reserve buoyancy is small, and once a ship's movement occurs, it is difficult to attenuate, and the ship's attitude changes significantly when sailing. There are drawbacks such as:

In order to compensate for this drawback, front hydrofoils 7a, 7b and rear hydrofoils 8a, 8b are provided, and in some cases, the angle of attack of these hydrofoils 7a, 7b, 8a, 8b is controlled to increase the damping force. This is done to increase the amount of air flow and to suppress changes in the ship's attitude during navigation. However, since the damping force is smaller when the ship is stationary than when it is sailing, it still has the disadvantage that the oscillations in waves are larger than when it is sailing, especially vertical movements.

In a semi-submerged catamaran, the widths of the struts 3a, 3b, 3a', 3b' are small, and the engines 13a, 13b are mounted on the submerged body 2.
a, 2b and the struts 3a, 3b, 3a', 3b', but are installed in the engine rooms 12a, 12b provided on the upper hull 1. Therefore, the propellers 5a, 5b have propulsion shafts 14a, 14b, first gear sets 17a, 17b, 17a', 17b',
Vertical transmission shafts 15a, 15b, second gear set 18
a, 18b, 18a', 18b' and horizontal transmission shaft 1
It is connected to engines 13a and 13b via 6a and 16b, and is driven.

In a semi-submerged catamaran, waves as shown in Figures 6 and 7 are generated mainly from the struts 3a, 3b, 3a', and 3b' that penetrate the water surface. When added, both polymerize to form A,
The wave surface is at its peak near points A' and B, and a severe impact may occur on the lower surface 1' of the upper hull 1 in this vicinity.

When the frequency of this wave impact increases, it not only increases the discomfort, but also damages the upper hull 1 and disturbs the operation of various instruments and devices due to the impact, which can impede the operation of the ship. This will cause a problem.

Therefore, as shown in Figures 8 to 10, the wave impact was reduced by creating a recess in the lower surface 1' of the center part of the upper hull and increasing the height of this part from the waterline 9. There are also conventional techniques. but,
In this case as well, it is difficult to increase the size of the dent much due to structural constraints, and once a wave impact occurs, the impact pressure acts intensively within the dent, which may actually amplify the problem. There is also a risk that it will happen. In addition, in the case of a ship as well, when the ship is stopped in waves, the damping force is smaller than when the ship is sailing, so the oscillation is large, and in particular, the vertical movement is large, as in other cases.

In view of the above-mentioned points, the present invention is designed to alleviate the wave impact on the hull during cruising and reduce the oscillation of the hull while cruising at slow speed or at rest.
The purpose is to provide a semi-submerged catamaran.

Therefore, the submerged catamaran of the present invention has a pair of left and right submerged bodies located below the water surface, and one submerged body located above the water surface.
one or more upper hulls, a pair or more struts that penetrate the water surface and connect the upper hulls to the pair of left and right submerged bodies, and project inwardly from the front and rear parts of the pair of left and right submerged bodies, respectively. In a semi-submerged catamaran equipped with a front hydrofoil and a rear hydrofoil, the leading edge is located rearward of the front hydrofoil along the central lower surface of the upper hull, and the rear edge is located above the front hydrofoil. A wave impact mitigation member located forward of the rear hydrofoil is provided, and the wave impact mitigation member is provided with a link mechanism pivotally mounted between the member and the lower side of the upper hull, and the link mechanism. The wave impact mitigation member is arranged to be movable in the vertical direction via a servo cylinder pivotally mounted between the link mechanism and the lower side of the upper hull in order to fold and expand the It is characterized by being provided with means for fixing it in a desired position.

Hereinafter, a semi-submerged catamaran as an embodiment of the present invention will be explained with reference to the drawings. Figs. 11 to 18 show the first embodiment, Figs. 19 to 20 show the second embodiment, and Figs. 21 to 20 show the second embodiment. Figure 24 shows the third embodiment, Figures 11, 13, 19, 21, and 23 are side views, Figure 12 is a sectional view taken along line XII-XII in Figure 11, and Figure 14 is a cross-sectional view of the 20 is a sectional view taken along the - line in Fig. 19, Fig. 22 is a sectional view taken along the - line in Fig. 21, and Fig. 24 is a sectional view taken along the - line in Fig. 23.
15 is a perspective view showing the wave impact mitigation member, and FIG. 16 is a cross-sectional view taken along the line shown in FIG. 15.
A cross-sectional view showing an enlarged part of the cross-section along the line,
17 and 18 are cross-sectional views showing modified examples of the wave impact mitigation member, similar to FIG. 16.

The same reference numerals as those already described indicate almost the same parts, and 23 and 23' are damping plates, 23'' is a wire mesh, and 24 and 2
4', 24a, 24b are outer frames, 25a, 25b are link mechanisms, and 26a, 26b are servo cylinders.

First, to explain the first embodiment shown in FIGS. 11 to 18, this embodiment has a pair of left and right submerged bodies 2a, 2.
b and one upper hull 1 by one strut 3 each.
This relates to a semi-submerged catamaran connected by a and 3b.

As shown in FIGS. 11 and 12, along the lower surface 1' of the central part of the upper hull 1, the outer frames 24, 24', 24
It is provided with a wave impact mitigation member constituted by a, 24b and a plurality of damping plates 23 provided therein.

This wave impact mitigation member has a link mechanism 25 pivotally mounted between the member and the lower side of the upper hull.
a, 25b, the wave impact mitigation member is normally installed close to the lower surface 1' of the central part of the upper hull 1, but when the ship is stopped, the wave impact mitigation member may be installed as shown in FIGS. 13 and 14. Servo cylinders 26a, 26b are pivotally mounted between the link mechanisms 25a, 25b and the lower side of the upper hull 1 so that the servo cylinders 26a, 26b can be lowered to a position below the waterline 9 and fixed. The cylinders 26a, 26b allow the link mechanisms 25a, 25b to be folded and expanded.

In this way, the vertical movement of the wave impact mitigation member and its fixation at the required position are performed by the servo cylinders 26a, 26b and the link mechanism 25.
a, 25b.

In addition, as shown in FIGS. 15 and 16, the wave impact mitigation member includes outer frames 24, 24', 24a, and 24.
b, and a plurality of damping plates 23 installed at an angle inside the damping plate 23.

In addition, as a wave impact mitigation member, damping plates 23' may be arranged in a staggered manner as shown in FIG. 17, or wire mesh may be used instead of the damping plates 23 as shown in FIG. It is also possible to use a plurality of layers of 23''.

The range in which this wave impact mitigation member is provided extends in the width direction up to the position where it reaches the pillar reinforcement parts 4a and 4b in the maximum case, and in the front and rear direction, it includes above point A shown in FIG. However, in the present invention, the front hydrofoil 7
a, 7b and the rear hydrofoils 8a, 8b, thereby preventing interference between the wave impact mitigation member and each hydrofoil 7a, 7b, 8a, 8b. ing.

As mentioned above, since the wave impact mitigation member is usually installed close to the lower surface 1' of the central part of the upper hull 1, waves may be applied to the lower surface 1' of the upper hull 1 while cruising in waves. Even if there is a collision, the waves are decelerated and attenuated by the wave impact mitigation member, and the wave impact on the lower surface 1' can be significantly reduced, thereby reducing the discomfort caused by the wave impact. , damage to the upper hull 1, malfunctions of various instruments and devices, etc. can be eliminated.

In addition, as shown in Figures 13 and 14, by lowering and fixing the wave impact mitigation member below the waterline 9, the damping force against the ship's motion, especially vertical motion, is greatly increased, so it is possible to Even when the ship is stopped at sea, the ship's rocking, especially vertical movement, can be significantly reduced, making it convenient for stopping in waves and carrying out various operations.

The wave impact mitigation member is limited in its front and rear range to the area sandwiched between the front hydrofoils 7a, 7b and the rear hydrofoils 8a, 8b, so when the wave impact mitigation member descends, Hydrofoils 7a, 7b, 8
There is no risk of damage due to contact with parts a and 8b.

Furthermore, since the wave impact mitigation member is supported by the link mechanisms 25a, 25b and the servo cylinders 26a, 26b arranged as described above and can move up and down, the wave impact mitigation member can move up and down. This has the advantage of not requiring a driving member that slides through the lower outer skin of the upper hull, or a sealing means for watertightly sealing the sliding portion thereof.

19 and 20 show a second embodiment of the present invention. In this embodiment, a pair of left and right submerged bodies 2a, 2b and one upper hull 1 are supported by two struts 3a,
This relates to a semi-submerged catamaran connected by 3b, 3a', and 3b'.

In this second embodiment, similarly to the first embodiment, a wave impact mitigation member is provided on the lower surface 1' of the central portion of the upper hull 1 via link mechanisms 25a, 25b and servo cylinders 26a, 26b. Therefore, the same effects as in the first embodiment can be obtained.

21 to 24 show a third embodiment of the present invention. In this embodiment, a pair of left and right submerged bodies 2a, 2b and one upper hull 1 are connected to one support column 3a,
3b, and a semi-submerged catamaran in which a recess 22 is provided in the lower surface 1' of the central part of the upper hull 1.

In this third embodiment, similarly to the first embodiment, a wave impact mitigation member is provided on the lower surface 1' of the central portion of the upper hull 1 via link mechanisms 25a, 25b and servo cylinders 26a, 26b. Since this wave impact mitigation member is normally installed close to the recess 22, the same effects as in the first embodiment can be obtained, and the distance of the wave impact mitigation member from the waterline 9 can be increased. This makes it possible to make it even more difficult for wave shock to occur.

As detailed above, according to the present invention, the following effects and advantages can be obtained.

(1) The wave impact mitigation member is arranged along the lower surface of the upper hull between the front hydrofoil and the rear hydrofoil and is configured to be able to move up and down. It is possible to reduce the impact of waves on the upper hull during navigation without causing interference with the wings or rear hydrofoils, and to suppress vertical movement of the hull due to waves when the ship is stopped or when cruising at slow speed.

(2) The wave impact mitigation member can be moved up and down and fixed at the required position by a link mechanism pivotally mounted between the member and the lower side of the upper hull, and a link mechanism between the link mechanism and the lower side of the upper hull. Since this is carried out via a servo cylinder pivotally mounted between them, the drive member that slides through the lower outer frame of the upper hull and the watertight sealing means for the sliding part are not included. do not need.

(3) Paragraphs (1) and (2) above can significantly improve the safety and ride comfort of a semi-submerged catamaran.

[Brief explanation of drawings]

Figures 1 to 3 show the first conventional semi-submerged catamaran, with Figure 1 being a side view, Figure 2 being a sectional view taken along the - line in Figure 1, and Figure 3 being a cross-sectional view of the same. It is a top view, Figures 4 and 5 show a second conventional semi-submerged catamaran, Figure 4 is a side view thereof, and Figure 5 is a sectional view taken along the - line in Figure 4. Figures 6 and 7 respectively show the wave conditions generated in the first and second conventional semi-submerged catamarans, and Figure 6 is a sectional view taken along the - line in Figure 1; Figure 7 is a sectional view taken along the - line in Figure 4, Figures 8 to 10 show a third conventional semi-submerged catamaran, Figure 8 is a side view thereof, and Figure 9 is a side view of the same. 8 is a sectional view taken along the - line in FIG. 8, FIG. 10 is a sectional view taken along the - line in FIG. The 11th, 1st
Figure 3 is its side view, Figure 12 is XII-XII of Figure 11.
A cross-sectional view along the line, Fig. 14 is - of Fig. 13.
15 is a perspective view showing the wave impact mitigation member, and FIG. 16 is a cross-sectional view taken along the line shown in FIG. 15.
17 and 18 are cross-sectional views showing a modified example of the wave impact mitigation member in the same way as FIG. 16;
FIG. 20 shows a semi-submerged catamaran as a second embodiment of the present invention, FIG. 19 is a side view thereof, and FIG.
The figure is a sectional view taken along the - line in Figure 19, Figures 21 to 24 show a semi-submerged catamaran as a third embodiment of the present invention, and Figures 21 and 23 are side views thereof. , Figure 22 is - of Figure 21
FIG. 24 is a sectional view taken along the line - in FIG. 23. 1...Upper hull, 1'...Lower surface of upper hull, 2
a, 2b...submerged body, 3a, 3b, 3a', 3b'...
...Strut, 4a, 4b, 4a', 4b'...Strut reinforcement part, 5a, 5b...Propeller, 6a, 6b...
Rudder, 7a, 7b... Front hydrofoil, 8a, 8b...
Rear hydrofoil, 9...waterline, 10...cabin, 11
...cockpit, 12a, 12b...engine room 13a,
13b... Engine, 14a, 14b... Propulsion shaft, 15a, 15b... Vertical transmission shaft, 16a, 1
6b...Horizontal transmission shaft, 17a, 17b, 17a',
17b'...1st gear set, 18a, 18b, 1
8a', 18b'... Second gear set, 19... Bulwark, 20a, 20b, 20a', 20b'... Waves generated inside the catamaran, 21a, 21b, 21
a′, 21b′……Waves generated on the outside of the catamaran, 22
...Concave, 23, 23'...Damping plate, 2
3″...Wire mesh, 24, 24', 24
a, 24b...Outer frame, 25a, 25b...Link mechanism, 26a, 26b...Servo cylinder.

Claims (1)

[Claims] 1 A pair of left and right submerged bodies located below the water surface, an upper hull located above the water surface, one or more pairs of struts that penetrate the water surface and connect the upper hull to the left and right pair of submerged bodies, and the above-mentioned In a semi-submerged catamaran equipped with a front hydrofoil and a rear hydrofoil that protrude inward from the front and rear of a pair of left and right submerged bodies, respectively, along the lower surface of the center of the upper hull, a wave impact mitigation member having a leading edge located rearward of the front hydrofoil and a trailing edge located forward of the rear hydrofoil;
The wave impact mitigation member includes a link mechanism pivotally mounted between the member and the lower side of the upper hull, and a link mechanism and the lower side of the upper hull for folding and extending the link mechanism. The semi-semi-semi-semiconductor is arranged to be movable in the vertical direction via a servo cylinder pivotally mounted between the wave impact-reducing member and is provided with means for fixing the wave impact-reducing member at a predetermined position. Submerged catamaran.