JP3332627B2 - Large fertilized ship with means to improve propulsion performance in waves - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-sized fertilized ship provided with a means for improving propulsion performance when sailing in waves.

[0002]

2. Description of the Related Art As a conventional large fertilized ship, a hull 1 is provided with a bow valve 1b as shown in FIG. 11 (a side view of a bow portion) and FIG. 12 (a horizontal sectional view along a draft line in FIG. 11). The shape of the horizontal section of the bow end 1c in the vicinity of the full draft line 2 is formed in a gentle convex curve.

[0003]

Incidentally, since a ship navigates in the waves, it is necessary to improve not only the flat water but also the overall propulsion performance including the performance in the waves. In order to improve the performance in waves, it is necessary to reduce the resistance acting on the hull in waves, but in general, in order to reduce the resistance in waves, it is effective to reduce the hull motion, There are many inventions related to hull motion reduction devices. However, a large ship such as a tanker originally has a small hull motion, and therefore, it is difficult to suppress the increase in resistance in waves by techniques using motion mitigation.

FIG. 13 is a graph showing an increase in resistance with respect to the wavelength-to-length ratio of a large fertilized ship. The increase in resistance can be mainly separated into a component due to the hull motion and a component due to the reflected wave at the bow. In particular, for a large ship as shown in FIGS. 11 and 12, the main navigation range is where the wavelength / capacity ratio is small, and as described above, it can be seen that the component due to the reflected wave is more remarkable than the hull motion. Therefore, in order to reduce the resistance increase in waves, it is necessary to reduce the resistance increase component due to the reflected wave.

It has been known that it is basically necessary to elongate the bow shape in order to reduce the resistance increase component due to the reflected wave. Therefore, there are several inventions related to the bow shape based on this principle. There is no simple additional means to improve the performance in waves for ships in the middle. The present invention has been made in view of the above-described points, and provides a large-sized fertilized ship with improved propulsion performance provided with additional means for minimizing the generation of reflected waves at the bow during navigation in waves. The purpose is to:

[0006]

In order to achieve the above object, a large fertilized type boat equipped with a means for improving propulsion performance in waves according to the present invention comprises a bow valve protruding forward of a bow perpendicular line below a full draft line. In a large fertilized ship having a bow above the full draft line and protruding forward from the bow perpendicular, fixed to the bow end near the full draft line so that the pointed edge goes forward and penetrates the flat water surface With a wedge-shaped addition
A pointed edge of the wedge-shaped appendage is formed so as to extend vertically along the hull center line behind the front end of each of the above-mentioned bow valve and the upper part of the bow and ahead of a vertical line of the bow. interior angle of the wedge-shaped adduct, is set smaller than the interior angle of the bow portion along the hull center line immediately following the tip edges, upper Symbol wedge adduct is divided into a wedge-shaped upper adduct and wedge lower adduct Further, a water passage along the full draft line is formed between the wedge-shaped upper attachment and the wedge-shaped lower attachment.

Further, the large fertilized ship with the means for improving the propulsion performance in waves according to the present invention has a bow valve protruding forward from the vertical line below the full draft line and protruding forward from the vertical line above the full draft line. A large fertilized ship having an upper part with a bow provided with a wedge-shaped appendage attached to the bow end near the full draft line so as to penetrate the flat water surface with the sharp edge forward. The pointed edge is formed so as to extend vertically along the hull center line in front of the bow valve and the front ends of the upper part of the bow in use , and the inner angle of the wedge-shaped appendage at the pointed edge in use is formed. A pair of left and right first plates, each of which is set to be smaller than the inner angle of the bow portion along the hull center line immediately after the pointed edge and the wedge-shaped appendage is rotatably supported at the base edge by the hull. Member and the first plate member Each torque hinge edge to the end
Is configured to be foldable with a pair of left and right second plate members that are pivotally attached via the other end and that are pivotally attached to each other,
A guide mechanism and a drive mechanism for retracting the base edge of the first plate member rearward and storing the first plate member in the ship are provided.

[0008]

In the above-mentioned large-sized fertilized ship equipped with the means for improving propulsion performance in waves according to the present invention, the waves incident on the bow from the front during navigation in waves are separated into right and left by the pointed edge of the wedge-shaped appendage. As a result, the generation of the reflected wave at the bow portion as in the related art is prevented, and the increase in the resistance is suppressed .

Further, since it is divided into a wedge-shaped upper adduct and wedge lower adduct to form a water passage to the wedge-shaped adduct along the full water line, the incident wave to the bow when in waves sailing is the Since the water is broken by the water flowing into the water passage, the generation of the reflected wave is prevented, and the increase in the resistance is suppressed.

[0010] Further, the wedge-shaped additional product is a pair of left and right first
One plate member and one end of each end edge
The other end is pivotally connected to the other
It is composed of a right and left of the second plate member, in a state of use of its extending along vertically to the hull center line forward of the front end of the tip edge bow top and bow valves, and above storage conditions In the case where the wedge-shaped appendage is configured to be foldable, when the wedge-shaped appendage is used in a state of sailing in waves, the outer surface of the bow that is gently curved along the draft line between the upper part of the bow and the bow valve is wedge-shaped. The interior angle at the pointed edge of the wedge-shaped appendage can be made sufficiently small while sufficiently covering it with the appendage, whereby the effect of separating the incident wave to the bow right and left to prevent the generation of reflected waves can be accurately achieved. Will be performed. When the wedge-shaped appendage is not used, the wedge-shaped appendage is folded by the operation of the torque hinge and retracted behind the upper part of the bow and each front end of the bow valve so as not to cause trouble in maneuvering. Can be

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show a large fertilized ship with a means for improving propulsion performance in waves as a first reference example up to the present invention. FIG. 1 is a side view of the bow portion, FIG. 2 is a front view of the bow portion, and FIG. 3 is a horizontal sectional view of the full draft line.

In this first reference example, the upper bow 1a protrudes forward from the vertical line FP above the full draft line 2 and forwardly below the vertical line FP below the full draft line 2. In a large fertilized ship having a protruding bow valve 1b, the right and left joints are attached to the bow end portion 9 near the full draft line 2 so that the wedge-shaped attachment 3 penetrates a flat water surface with the pointed edge e directed forward. The parts 6, 7 and the upper and lower joint parts 5, 8 are fixed by welding.

The pointed edge e of the wedge-shaped appendage 3 extends vertically along the hull center line 4 behind the front ends of the bow upper part 1a and the bow valve 1b and forward of the bow perpendicular FP. The inner angle α of the wedge-shaped appendage 3 at the pointed edge e is set to be smaller than the inner angle β of the bow portion along the hull center line 4 immediately after the pointed edge e. In the first reference example, the wedge-shaped attachment 3 is configured to surround the bow portion with a plate member, but the interior may be filled with a foamed resin or the like.

[0014] In the first reference example described above, when sailing in waves, the waves entering from the front to the bow portion, should be able to cut into the right and left by point edges e of the wedge-shaped adducts 3, thereby as in the prior art The generation of reflected waves at the bow is prevented, and an increase in resistance is suppressed. In addition, the wedge-shaped attachment 3 can be easily attached to the bow of an existing ship, so that the propulsion performance in waves can be improved. further,
The pointed edge e of the wedge-shaped attachment 3 is the upper part 1a of the bow or the valve 1 of the bow.
Since it is formed behind each front end of b, there is no trouble in maneuvering in a port or the like.

Next , in a second reference example leading to the present invention,
As shown in FIG. 4 (side view of the bow) and FIG. 5 (front view of the bow), the wedge-shaped appendix 3 mounted on the large fertilized ship similar to the first reference example is provided with a plate member and a bow end portion 9. And a large number of water passage holes 10 are formed in the plate member.

A gap is formed between the rear edge of the plate member constituting the wedge-shaped attachment 3 and the outer surface of the hull so that seawater that has entered through the water passage hole 10 can escape backward. With the above-described configuration, in the second embodiment, the same operation and effect as those of the first embodiment can be obtained. In addition, the wave incident on the bow portion is broken by the water flowing into the water hole 10 so that the reflection can be obtained. The generation of waves is prevented, and the increase in resistance is suppressed.

Next, in the first embodiment of the present invention, as shown in FIG. 6 (side view of the bow) and FIG. 7 (front view of the bow),
As in the first and second reference examples, in a large fertilized ship having a bow valve 1b, a wedge-shaped attachment 3 is provided at a bow end near the full load draft line 2 so that a point e is directed forward and a flat water surface is substantially formed. The joints 5a and 5b are fixed by welding so as to penetrate.

In the first embodiment, in particular, the wedge-shaped additional object 3 is divided into a wedge-shaped upper additional object 3a and a wedge-shaped lower additional object 3b, and the lower end of the wedge-shaped upper additional object 3a is slightly higher than the full load draft line 2. Along the upper edge of the wedge-shaped lower additional product 3b, the upper end of the wedge-shaped lower additional product 3b is formed so as to extend slightly below the full draft line 2. A water passage 11 along the full draft line 2 is formed.

In the first embodiment configured as described above,
In addition to the same effect as the first reference example described above can be obtained, it is divided into a wedge-shaped upper adduct 3a and wedge lower adduct 3b to form a water passage 11 that wedge adduct 3 is along the full water line 2 Therefore, when sailing in waves, the waves incident on the bow
The water flow to 11 causes collapse, which prevents the generation of reflected waves and suppresses an increase in resistance.

Next, a description will be given of a large-sized fertilized ship with means for improving the propulsion performance in waves according to a second embodiment of the present invention. FIG. 8 is a side view of the bow portion, and FIG. 9 is a horizontal sectional view along the full draft line. FIG. 10 is a horizontal sectional view showing the folded and stored state of the wedge-shaped additional object corresponding to FIG.

In the case of the second embodiment as well, as shown in FIG. 8.9, the upper part 1a of the bow and the lower part of the full draft line 2 projecting forward of the vertical line FP above the full draft line. In a large fertilized ship having a bow valve 1b protruding forward from the forward perpendicular FP, a wedge-shaped appendix 3 is provided at the bow end near the full draft line so that the pointed edge e is directed forward and a flat water surface is formed. It is provided so as to penetrate.

The pointed edge e of the wedge-shaped appendage 3 is formed so as to extend up and down along the hull center line 4 in front of the front ends of the bow valve 1b and the upper part 1a of the bow in use.
The interior angle α of the wedge-shaped appendage 3 at the pointed edge e is set to be smaller than the interior angle β of the bow portion 1c along the hull center line 4 immediately after the pointed edge e.

The wedge-shaped appendix 3 has a base end with a piston rod 15 of a hydraulic cylinder 15 mounted on the hull.
a a pair of left and right first plate members 3d, 3d rotatably supported via a hinge 14 at the distal end, and the first plate members 3d, 3d.
One end is pivotally connected to the leading edge of 3d via a torque hinge 13 and the other end is foldable by a pair of left and right second plate members 3c, 3c pivotally connected to each other by a hinge 12. . A groove 16 is provided as a guide mechanism for retracting and retracting the proximal edges of the first plate members 3d, 3d.
Is formed on the hull 1 and the hydraulic cylinder 15 has a function as a drive mechanism therefor.

Since the large-sized fertilized ship with the means for improving the propulsion performance in waves according to the second embodiment is constructed as described above, when the wedge-shaped appendix 3 is used in the state of sailing in the waves 2a, The inner angle α at the pointed edge e of the wedge-shaped appendage 3 is sufficiently reduced while sufficiently covering the outer surface of the bow, which is gently curved along the draft line, between the upper part 1a of the bow and the bow valve 1b. As a result, the wave 2a incident on the bow portion is divided into left and right sides, so that the action of preventing the generation of reflected waves can be properly performed.

When the wedge-shaped attachment 3 is not used, FIG.
As shown in the figure, the wedge-shaped appendix 3 is folded by operating the torque hinge 13 and the hydraulic cylinder 15 is operated so as to be retracted rearward from the front ends of the upper bow 1a and the bow valve 1b. , It is possible to prevent trouble in ship operation.

[0026]

As described above in detail, the following effects can be obtained by the large fertilized ship with the means for improving the propulsion performance in waves according to the present invention. (1) Waves incident on the bow from the front during sailing in the waves will be cut right and left by the sharp edge of the wedge-shaped appendage, thereby preventing the generation of reflected waves at the bow as in the conventional case. As a result, an increase in resistance is suppressed. (2) The propulsion performance in waves can be improved by easily attaching a wedge-shaped attachment to the bow of an existing ship. (3) Since the pointed edge of the wedge-shaped appendage is formed at the upper part of the bow and behind the front ends of the bow valves, there is no trouble in maneuvering in harbors. (4) since it is divided into a wedge-shaped upper adduct and wedge lower adduct as the wedge-shaped adduct to form a water passage along the full water line, the water conduit is incident wave to the bow when in Waves cruising As a result, the reflected wave is prevented from being generated and the increase in resistance is suppressed. ( 5 ) The wedge-shaped additional material includes a pair of left and right first plate members,
One end is attached to each end edge via a torque hinge.
Left and right second plate members pivotally connected to each other at the other end.
Is composed of a, in use state of that extends vertically along the hull center line in front than the front end of the tip edge bow top and bow valves, and the wedge-shaped adduct collapsible in a storage state When the wedge-shaped appendage is used in a state of sailing in waves, the outer surface of the bow that is gently curved along the draft line between the upper part of the bow and the bow valve is sufficiently covered with the wedge-shaped appendage. In this way, the internal angle at the pointed edge of the wedge-shaped appendage can be made sufficiently small, so that the wave incident on the bow portion can be divided into left and right sides, and the effect of preventing the generation of reflected waves can be properly performed. When the wedge-shaped additional product is not used, the wedge-shaped additional product is attached to the torque
By retracting it by operating the flange and retracting it so that it can be retracted from the upper part of the bow and the front end of each of the bow valves, it is possible to prevent trouble in maneuvering.

[Brief description of the drawings]

FIG. 1 is a side view of a bow portion of a large fertilized ship with a means for improving propulsion performance in waves as a first reference example up to the present invention.

FIG. 2 is a front view of a bow of the large fertilized ship shown in FIG.

FIG. 3 is a horizontal sectional view of the bow of the large fertilized ship of FIG. 1 taken along a full draft line.

FIG. 4 is a side view of a bow portion of a large fertilized ship with a means for improving propulsion performance in waves as a second reference example up to the present invention.

5 is a front view of the bow of the large fertilized ship shown in FIG.

FIG. 6 is a side view of a bow portion of a large fertilized ship equipped with means for improving propulsion performance in waves as a first embodiment of the present invention.

7 is a front view of the bow of the large fertilized ship shown in FIG. 6;

FIG. 8 is a side view of a bow portion of a large fertilized ship equipped with means for improving propulsion performance in waves as a second embodiment of the present invention.

9 is a horizontal cross-sectional view of the bow of the large fertilized ship of FIG. 8 along the full draft line.

FIG. 10 is a horizontal sectional view showing a state in which the wedge-shaped additional object is stored in the large fertilized ship shown in FIG. 8, corresponding to FIG.

FIG. 11 is a side view of a bow of a conventional large fertilized ship.

12 is a horizontal cross-sectional view of the bow of the large fertilized ship of FIG. 11 along a full draft line.

FIG. 13 is a graph of an increase in resistance with respect to a wavelength-to-length ratio of a large fertilized ship.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hull 1a Bow upper part 1b Bow valve 1c Bow end 2 Full draft line 2a Wave 3 Wedge-shaped addition 3a Wedge-shaped upper addition 3b Wedge-shaped lower addition 3c 2nd plate member 3d 1st plate member 4 Hull centerline 5, 5a, 5b , 6,7,8 joint 9 bow end 10 water hole 11 water passage 12 hinge 13 torque hinge 14 hinge 15 hydraulic cylinder 15a piston rod 16 concave groove

Continuation of the front page (56) References JP-A-61-166783 (JP, A) JP-A-58-30597 (JP, U) JP-A-56-77495 (JP, U) JP-A-63-129695 (JP) , U) (58) Field surveyed (Int.Cl. ⁷ , DB name) B63B 1/06 B63B 1/40

Claims (2)

(57) [Claims] Claims: 1. A full-size draft line having a bow valve protruding forward of a bow perpendicular below a full draft line and an upper part of a bow projecting forward of a bow above a full draft line. A wedge-shaped attachment fixed to the vicinity of the bow end portion so that the sharp edge is directed forward and penetrates the flat water surface, and the sharp edge of the wedge-shaped addition material is larger than the above-mentioned bow valve and the front ends of the upper part of the bow. The wedge-shaped appendage is formed so as to extend rearward and forward with respect to the bow perpendicular, along the hull center line, and the inner angle of the wedge-shaped appendage at the cusp edge is along the hull center line immediately after the cusp edge. Part is set smaller than the inner angle of the part, and the wedge-shaped upper part is a wedge-shaped upper part.
And a wedge-shaped lower attachment
Waterway along the full draft line between the object and the wedge-shaped lower appendage
A large-sized fertilized ship with means for improving the propulsion performance in waves, characterized by having formed therein . 2. A full-fledged draft line having a bow valve protruding forward of the bow perpendicular below the full draft line and an upper part of the bow protruding forward of the bow above the full draft line. In the vicinity of the bow end, there is a wedge-shaped attachment mounted so as to penetrate the flat water surface with the leading edge directed forward, and when the leading edge of the wedge-shaped addition is in use, the above-mentioned bow valve and each of the upper part of the bow are provided. It is formed so as to extend up and down along the hull center line in front of the front end, and the inner angle of the wedge-shaped appendage at the same pointed edge at the time of use is such that the angle of the bow portion along the hull centerline immediately after the same pointed edge is obtained. A pair of left and right first plate members, each of which is set to be smaller than the inner angle, and the wedge-shaped appendage is rotatably supported at its base end edge by the hull, and one end is attached to the distal end edge of these first plate members. Each torque hinge
Is configured to be foldable with a pair of left and right second plate members that are pivotally attached via the other end and that are pivotally attached to each other,
A large fertilizer type with a means for improving propulsion performance in waves, wherein a guide mechanism and a drive mechanism are provided for retracting the base end edge of the first plate member rearward and storing the first plate member in the ship. ship.