JPS6056695A - Half-submerged catamaran - Google Patents

Abstract

PURPOSE:To relieve a wave impact during ship sailing as well as to aim at a reduction in pitching in time of stoppage of a ship, by installing a wave-shock absorbing member, which is lockable to a required position being free of movement in vertical directions, in the underside of the central part of the upper hull in a half-submerged ship. CONSTITUTION:A wave-shock absorbing member 23 is installed in an undersurface 1' at the central part of the upper hull 1 in a half-submerged catamaran having each of stanchions 3a and 3b which couple a symmetrical pair of half- submerged bodies 2a and 2b situated underwater with the upper hull 1 situated on the surface of the water through a water level. This wave-shock absorbing member 23 is designed to be free of lifting by means of link mechanisms 25a and 25b and hydraulic mechanism 26a and 26b. Usually, in time of sailing, the member 23 is set up at the upper part and absorbs a shock produced by an impact of waves against the undersurface of the upper hull 1. In time of stoppage, it is set up at the lower part and aims at absorbing an up-and-down motion due to the pitching of a ship.

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.

Figures 1 to 3 and Figure 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. This figure shows a conventional semi-submerged catamaran in which a pair of submerged bodies and an upper hull are connected by two struts each.

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, Figure 1.4.8 is a side view, Figure 3 is a top view, and Figure 2 is a side view.
The figure is a sectional view taken along the line ■-■ in Fig. 1, Fig. 5 is a sectional view taken along the line v-■ in Fig. tjS7 is a sectional view taken along the vm-vm line in Fig. 4 (
(Only the cross-sectional shape is shown and internal details are omitted.) Figures 9 and 10 are taken along lines IX-IX and X- in Figure 8, respectively.
In Figures 1 to 10, which are cross-sectional views along X-rays, 1 is the upper hull, 1' is the lower surface of the upper hull, 2a, 2b are submerged bodies, 3a, 3b, 3a'
.

3b' is the strut, 4a, 4b, 4a', 4b' are the strut reinforcement parts, 5a + 5b are the propellers, 6a, 6b are the rudders,
7a,? b is the front hydrofoil, 8g=8b is the rear hydrofoil, 9
is the waterline, 10 is the cabin, 11 is the cockpit, 12a, 12b
is the engine room, 13a, 13b are the engines, 14a, 14b
is a propulsion shaft, 15a, 15b are vertical transmission shafts, 16a, 16
b is a horizontal transmission axis, 17a, 17b, 17a'.

17b' is the first gear set, 18a, 18b, 18a''
, 18b' is the second gear set, one is the bulwark, 20
a, 20b.

20a' and 20b' are waves generated inside the catamaran;
1a.

2 lb, 21a', 2 lb' are waves generated on the outside of the catamaran, A is the superposition point of waves 20a and 20b, and A' is wave 2.
0a', 20b' overlap point, B indicates the overlap point after the waves 20a, 20b are reflected by the strut, 22 indicates a recess provided on the lower surface of the center of the upper hull 1, and the subscript a in each code is The port side and b indicate the starboard side.

As shown in Figures 1 to 7, a semi-submerged catamaran includes a pair of left and right submerged bodies 2a, 21) provided below the water surface, an upper hull 1 located above the water surface and having a large area, and One or two struts 3a, 3b, 3a', 3, which pass through the submerged bodies 2a, 2b and connect the upper hull 1, respectively.
b'. Then, as shown in Figures 6 and 7, branch office 3 a= 3 b, 3 a',
3 Waterline area of b' (cross-sectional area at waterline 9 of the strut)
It is characterized by being small and comfortable.

Because the semi-submerged catamaran is configured as described above, it is possible to reduce the force of waves acting on the hull during waves, making it difficult for the hull to move6. Since it is possible to reduce the resistance of the hull at high speeds, it is possible to sail at high speeds 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 suppresses changes in the ship's attitude during navigation.

However, because the damping force is smaller when the ship is stationary than when it is sailing, the drawback remains that the oscillation in the waves is greater than when racing, and the vertical movement is particularly large.

For semi-submerged catamarans, props 3 a, 3 b13 a', 3
The width of b' is small, and the engines 13a and 13b are connected to the submerged bodies 2a and 2b and the struts 3a, 3b, and 3a'.
, 3b', but are installed in the engine rooms 12g and 12b provided on the upper hull 1.

Therefore, the propellers 5a, 5b have propulsion shafts 14a, 1
4b.

1st gear set 1.7a, 17b, 17a', 17b
', vertical transmission shafts 15a, 15b, second gear set 1
8a, 18b, 18a'.

185' and horizontal transmission shafts 16a, 16b to be connected to and driven by engines 13a, 13b.

In a semi-submerged catamaran, the strut 3a mainly penetrates the water surface.

Waves like those shown in Figures 6 and 7 are generated from 3 b, 3 a', and 3 b', but when waves and swells occurring on the sea surface are added to these waves, they overlap and form A and A'. , the wave surface is at its peak near point B, and a severe impact may occur on the lower surface 1' of the upper hull 1 near this point.

When the frequency of this wave impact increases, it not only increases the discomfort, but also causes damage to the upper hull 1 and disturbs the operation of various instruments and devices due to the impact, resulting in operational problems for the ship. becomes.

Therefore, as shown in Figs. 8 to 10, a conventional technique has been proposed in which a recess is provided in the lower surface 1' of the center part of the upper hull to increase the height of the waterline 9 in this part, thereby reducing wave impact. There is also. In this case, too, it is difficult to increase the size of the dent due to structural constraints, and once a wave impact occurs, the impact pressure acts intensively within the dent, which can lead to problems. There is also a risk that it will be amplified. 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 aims to provide a semi-submerged catamaran that is capable of alleviating wave impact on the hull during navigation and reducing hull oscillations while the vessel is in operation or at rest. purpose.

Therefore, the semi-submerged catamaran of the present invention has a pair of left and right submerged bodies located below the water surface, an upper hull located above the water surface, and a pair of left and right submerged bodies that penetrate through the water surface. In a semi-submerged catamaran equipped with one or more pairs of struts each connected to the water body, a wave impact mitigation member is provided on the lower surface of the center of the upper hull, and the wave impact mitigation member is movable in the vertical direction. The present invention is characterized in that means is provided for fixing the wave impact mitigation member at a predetermined 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. 24
The figure shows the third embodiment.
1.23 is a side view, and Fig. 12 is the X■-xn of Fig. 11.
A cross-sectional view along the line, Fig. 14 is Fig. 13 77) XIV-X
A cross-sectional view along line IV, Figure 20 is XX-X in Figure 19.
A cross-sectional view along the X-ray, Figure 22 is XX■-XX in Figure 21
A cross-sectional view along line II, FIG. 24 is XXIV- in FIG. 23.
A sectional view taken along line XXIV, FIG. 15 is a perspective view showing a member using wave thrust 1s41, and FIG. 16 is a cross-sectional view taken along line XXIV.
Cross-sectional view showing an enlarged part of the cross-section along the VI line, No. 17
．． FIG. 18 is a sectional view showing a modified example of the wave impact mitigation member, similar to FIG. 16.

The same reference numerals as those already described indicate similar parts, and the reference numerals 23 and 23' indicate damping plates, 23
" is wire mensch, 24.24', 24a, 24
b is the outer frame, 25a, 25b are link mechanisms, 26a, 26
b indicates a servo cylinder.

First, the first embodiment shown in FIGS. 11 to 18 will be explained. This embodiment is a semi-submerged structure in which a pair of left and right submerged bodies 2a, 2b and one upper hull 1 are connected by one support column 3a, 3b, respectively. It concerns catamarans.

As shown in Fig. 11.12, the lower surface 1'1 of the central part of the upper hull 1 is composed of an outer frame 24, 24', 24a, 24b and a plurality of damping plates 23 provided inside the outer frame 24, 24', 24a, 24b. Equipped with wave impact mitigation components.

This wave impact mitigation member is usually a link mechanism 25a.

25b is installed close to the lower surface 1' of the central part of the upper hull 1, but when the ship is stopped, the servo cylinders 26a and 26b are operated as necessary to close the link mechanism 25a.
.

25b is extended, and the wave impact mitigation member is
As shown in Fig. 14, the servo cylinders 26a, 26b are lowered to a position below the waterline 9, and the servo cylinders 26a, 26b are installed at that position.
and can be fixed by link rocks 6125a, 25b.

Further, the wave impact mitigation member is constituted by a plurality of damping plates 23 installed at an angle inside the outer frames 24, 24', 24a, and 24b, as shown in FIGS. 15 and 16.

In addition, as a wave impact mitigation member, damping plates 23' are arranged in a staggered manner as shown in FIG. 17, or damping plates 23' are arranged in a staggered manner as shown in FIG.
Instead of wire mesh 23'', a plurality of layers of wire mesh 23'' may be used.

Note that the range in which this wave impact mitigation member is provided extends up to the point where it reaches the column reinforcement parts 4a and 4b in the maximum case in the 1st direction, and extends above point A shown in Fig. 6 in the front-back direction. The range should be such that it has sufficient length before and after the front and rear hydrofoils, but generally the front hydrofoils 7a, 7b and the rear hydrofoils 8
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, Even if waves collide with the lower surface 1' of the upper hull 1 while cruising, the waves are decelerated and attenuated by the wave impact mitigation member, and the wave impact on the lower surface 1' is significantly reduced. This makes it possible to eliminate discomfort caused by wave impact, damage to the upper hull 1, malfunction of various instruments and devices, etc.

In addition, as shown in Figure 13.14, by lowering and fixing the wave impact mitigation member below the draft #iI9, the damping force against hull oscillations, especially vertical motion, increases significantly, so it is possible to Even when the ship is stopped, the ship's rocking, especially vertical movement, can be greatly reduced, making it convenient for stopping in waves and carrying out various operations.

Note that the front and rear range of the wave impact mitigation member is the front hydrofoil 7.
a, 7b and the rear hydrofoils 8a, 8b, so when the wave impact mitigation member descends,
There is no risk of damage due to contact with the underwater jljL 7 at 7 be 8 m, 8 b.

Figures 1.9 and 20 show a second embodiment of the invention,
In this embodiment, a pair of left and right submerged bodies 2a, 2b and one upper hull 1 are each supported by two supports 3a, 3b, 3a.
This relates to a semi-submerged catamaran connected by ', 3 b'.

In this second embodiment, as in the first embodiment described above, a wave impact mitigation member is provided on the lower surface 1' of the central portion of the upper hull 1 by link mechanisms 25a, 25b and a servo ring 26a.

26b, the same effects as in the eleventh embodiment can be obtained.

21 to 24 show a third embodiment of the present invention, in which a pair of left and right submerged bodies 2a, 2b and one upper hull j are connected by one strut 3a, 3b, respectively. , relates to 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.

Similarly to the first embodiment, in this third embodiment, a wave impact mitigation member is attached to the link mechanism 2 on the lower surface 1' of the central part of the upper hull 1.
5a, 25b and servo sills 26a, 26b, and 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. At the same time, the distance of the wave impact mitigation member from the waterline 9 can be increased, making it even more difficult for wave impact to occur.

As described in detail above, according to the present invention, in a semi-submerged catamaran in which a pair of left and right submerged bodies located below the water surface and an upper hull above the water surface are connected by a branch, the central lower surface of the upper hull It has an extremely simple structure that is equipped with a wave impact mitigation member that can be moved vertically and fixed at a desired position, reducing wave impact on the hull during rough sea voyage. This can be effectively mitigated, making it possible to significantly improve the safety of a semi-submerged catamaran, and also contribute to improving ride comfort.

Further, by lowering and fixing the wave impact mitigation member below the water surface, an advantage can be obtained that the vibration of the ship, especially the vertical movement, can be significantly damped when the ship is stopped or operated in waves.

[Brief explanation of drawings]

Figures 1 to 3 show the first conventional semi-submerged catamaran.
Figure 1 is a side view, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, Figure 3 is a top view, and Figures 4 and 5 are
Figure 4 is a side view of the conventional semi-submerged catamaran, and Figure 5 is a sectional view taken along the line ■-■ in Figure 4.
Figures 6 and 7 show wave conditions generated in the first and second conventional semi-submerged catamarans, respectively. Figure 6 is a sectional view taken along the line Vl-Vl in Figure 1; Figure 7 is a sectional view taken along line VII-VII in Figure 4, Figures 8 to 10 show a third conventional semi-submerged catamaran, Figure 8 is a side view thereof, Figure 9 The figure is a sectional view taken along the line IX-IX in FIG. 8, FIG. 10 is a sectional view taken along the line X-X in FIG. 8, and FIGS. It shows a submerged catamaran, and Figure 11.13 is its side view, Figure 12.
The figure is a sectional view taken along the line xn-xn in FIG. 11, FIG. 14 is a sectional view taken along the line Xn-XIV in FIG. 13, FIG. 15 is a perspective view showing the wave impact mitigation member, and FIG. A sectional view showing an enlarged part of the cross section along the line XVI-XVI in FIG. 15, and FIGS. 17 and 48 are sectional views showing modified examples of the wave impact mitigation member in the same way as FIG. 16, Figures 19 and 20 show a semi-submerged catamaran as a second embodiment of the present invention, Figure 19 is a side view thereof, and Figure 20 is XX in Figure 19.
21 to 24 are cross-sectional views taken along the line -XX, and FIGS. 21 to 24 show a semi-submerged catamaran as a ptS3 embodiment of the present invention,
Figure 21.23 is its side view, Figure 22 is the X in Figure 21.
A cross-sectional view along the Xn-XXn line, FIG. 24 is the X in FIG. 23.
It is a sectional view along the line XIV-XXIV. 1...Upper hull, 1'...Lower surface of upper hull, 2a, 2
b...Submerged body, 3a, 3b, 3a', 3b'...Strut, 4a, 4b. 4a', 41'... Strut reinforcement part, 5a, 5b... Propeller, 6a, 6b... Rudder, 7a, 7b... Front hydrofoil, 8a, 8b... Rear hydrofoil, 9... Water line, 10...
Cabin, 11... Cockpit, 12a, 12b, 4fi control room,
13a, 13b...Engine, 14a, 14b...Propulsion shaft, 15a, 1.5b...Vertical transmission shaft, 16a, 16b
...Horizontal transmission shaft, 17a, 17b. 17a', 17b'...first gear set, 18a,
18b. 18a', 18b'...second gear set, 19--
Bulwark, 20a, 20b = 20a', 20b'
...'lil hull f) Waves generated inside, 21a, 2
lb, 21a', 2 lb'...Waves generated on the outside of the catamaran, 22...Dent, 23°23'...Damping plate, 23"...Wire mesh, 24.24'
, 24a, 24b-" Outer frame, 25a, 25b... Link Iso m, 26a, 26b... Servo sigender. Sub-agent Patent attorney Yoshihiko Iinuma Fig. 14 Fig. 11 Fig. 15° 4 "V □

Claims (1)

[Claims] A pair of left and right submerged bodies located below the water surface, an upper hull located above the water surface, and 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, respectively. In a semi-submerged catamaran, a wave impact mitigation member is provided on the lower surface of the center of the upper hull, and the wave impact mitigation member is arranged to be movable in the vertical direction, and the wave impact mitigation member is required. A semi-submerged catamaran characterized by being provided with means for fixing it in position.