JPH01153396A - Ship having special keel line - Google Patents

Abstract

PURPOSE:To reduce viscous resistance against a ship by forming a ship in a type having a keel line rising from a base line passing along the deepest part of the ship body, and a bow bulb and a stern one hanging down from the keel line to the base line. CONSTITUTION:A ship body 1 has a keel line 10 bending in an arc-shape, and a low bulb 11 and a stern one 12 hanging down to a base line 4. In addition, the keel line 10 rises higher than a bow and a stern, and a frame line 13 is formed as similarly as possible to a concentric circle. The above-mentioned ship body can therefore, reduce both viscous resistance and wave making one against a ship.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application: The present invention relates to a sailing dog-shaped boat whose propulsion performance is improved by specifying the shape of the bottom of the boat.

Prior art and its problems: The bottoms of ships, including container ships, are flat-bottomed (6) as shown in FIG. 6, in consideration of installation on a dock during construction or docking during repairs.

On the other hand, although there is always a demand for improved propulsion performance in order to increase speed or improve fuel efficiency, the above-mentioned flat-bottomed hull shape cannot be said to be an ideal shape from the standpoint of wave-making resistance and viscous resistance.

Several proposals have been made to improve the propulsion performance of such conventional flat-bottomed vessels, such as installing appendages such as bows and fins, or adopting an asymmetric stern, but none of them have been proposed by improving the main hull. Until then, we cannot hope for any major improvements.

Means for Solving the Problems: The present invention solves the problem of improving the propulsion performance, which has been at a dead end due to the flat-bottomed ship type, by changing the shape of the main hull, and achieves a significant improvement in the propulsion performance. aims to achieve. In other words, it is a flat-bottomed boat due to factors other than navigation, and as mentioned above, this restriction causes a considerable resistance loss. However, according to current construction and repair technology, it is not necessarily necessary to abide by this restriction, and improvements in the boards that support the hull have made it possible to perform construction and repair work even with lead workers with ship bottoms other than flat bottoms, making it more economical. In view of the current situation, which should be fully evaluated, the bottom of the hull's keel was not made flat, but instead was made of lead work that was cut up toward the bow and stern sides, thereby reducing viscous resistance.

Structure and operation: The structure of the present invention is such that the keel line cuts up from the baseline passing through the deepest part of the hull toward the bow and stern; the bow pulp and the stern pulp hang down from the keel line and reach the baseline. The keel line is characterized by lead work, and care has been taken to make the frame line as close to a concentric circle as possible.
The fact that leadwork with a nearly circular frame line (so-called piking style) greatly contributes to reducing viscous resistance is that
This is clear from the theory of wave resistance and viscous resistance. but,
On the other hand, the propulsion efficiency may be slightly reduced due to the decrease in wake gain, but this phenomenon can be suppressed by providing the stern pulp in a hanging shape. Furthermore, in the case of a leadwork in which the keel line is cut upward toward the bow, it is possible to further reduce the wave-making resistance by providing the bow pulp in a hanging manner.

There are various ways to round up the keel line, such as: (1) Curving it into an arc, (2) Rounding it up into a polygonal line, (2) Making it into an arbitrary curve, and it is also possible to combine these methods.

Example: Hereinafter, a first embodiment of the present invention will be explained based on the drawings.

As shown in Figure 1 and its outline diagram in Figure 1 and Figure 2, respectively, the hull has an arcuate keel line a.
0, the hull (1) has a hanging bow pulp αD reaching the baseline (4) and a stern pulp (6). In this way, we basically set the keel line 00 with the bow (2) and stern (3) cut up, and as shown in Figure 2, each frame line α■ is as close to a concentric circle as possible. It has become a thing.

By making the hull (1) have the above configuration, viscous resistance,
Both wave resistance can be reduced. In addition, if there is a concern that the propulsion efficiency will decrease slightly, as shown in Figure 8, the stern end (3γ) is formed at the asymmetric stern part α→, and the stern pulp @
A rotating flow is generated around the propeller in the opposite direction to the propeller, and this rotating flow is introduced into the propeller. In this way, the effective wake can be increased, thereby improving propulsion efficiency.

Please note that this ship type is subject to damage during construction and repair.
Taking the arc-shaped keel line as an example, (a) Set the center board so that the keel line a1 of the hull (1) is aligned with the arc-shaped bottom of the ship, and the line connecting the tops of each is arc-shaped. (b) An automatic board with a jacking function to adjust the height will be installed at the bow pulp and stern pulp positions, and (c) An automatic belly board will be installed to match the ship's frame line.

This allows stable docking. In particular, the arc-shaped keel line also contributes to absorbing displacement in the longitudinal direction during docking.

In addition to adjusting the board groups mentioned above, the docking of this ship type also involves adjusting the skeg α along the center line as shown in Figure 4.
Docking can also be approximated to the conventional method by providing Q in a protruding manner at the cut-up portion of the keel line OQ.

Effects of the invention: The lead work of the present invention is suitable for high-speed ships such as container ships, where the engine room is located in the center rather than at the rear. Between the bow part (2) and the stern part (3) with a central parallel part (5)
By adding , it can be applied to enlarged ships such as tankers.

This ship type with an arcuate keel line has been shown to reduce the required horsepower by 5 to 10% compared to a conventional flat-bottom single-shaft ship of the same size, and has high industrial applicability.

[Brief explanation of the drawing]

FIG. 1 is a profile of one embodiment of the present invention, FIG. 2 is a schematic route map, FIG. 3 is a schematic route map of another embodiment, FIG. 4 is a profile of another embodiment, and FIG. 5 6 is an explanatory diagram of an application example included in the present invention, and FIG. 6 is a diagram showing a conventional ship shape. (1)...Hull (2)...Fore part (3
)...Stern part (3)'...Stern end (4)
...Baseline (5) ...Central parallel part (6)
...Flat bottom αO...Keel line α sword・
... Bow pulp @ ... Stern pulp α ■ ... Frame line α → ... Asymmetrical stern part α9 ... Skeg Applicant Sanoyas Co., Ltd. 3A Choyan 2nd year 1st part Figure 2 Figure 3 Figure 6

Claims (1)

[Claims] 1. A keel line is cut up from a baseline passing through the deepest part of the hull toward the bow and stern; bow pulp and stern pulp hang down from the keel line; characterized by a ship shape. A ship with a special keel line. 2. A ship having a special keel line as set forth in claim 1, in which the frame line is as close to a concentric circle as possible.