An inner hull design method for a double-hull ship and a double-hull ship

Abstract

The present application provides a method for designing the inner hull of a double-hull ship and a double-hull ship. The inner hull design method includes: S1. Offset the outer hull surface of the original double-hull ship inward by a predetermined distance to obtain a new hull surface. Use the new hull surface as the prototype surface of the inner hull and use the inner hull prototype surface as the reference for subsequent adjustment of the inner hull surface. S2. Calculate the ship ballast tank capacity of the original inner hull surface. S3. When the ballast tank capacity meets the design requirements, adjust the original inner hull surface to approach the inner hull prototype surface. Reshape and reposition the multiple folding surfaces of the original bow inner hull surface, midship inner hull surface, and stern end surface respectively to complete the design of the inner hull surface. The present application can not only provide a method for quickly optimizing the design of the inner hull surface, but also quickly determine the positions and shapes of the multiple folding surfaces in the inner hull surface. By being able to create points, lines, surfaces, and enclosed spaces, while quickly obtaining the design solution, it can also adjust and increase the ship ballast tank capacity.

Description

Technical Field

[0001] The present application relates to the technical field of shipbuilding, and more particularly, to a method for designing the inner hull of a double-hull ship and a double-hull ship. Background Art

[0002] A double-hull ship refers to a ship with a double bottom and two layers of shell plates on the ship's side. Double-hull oil tankers have good heat insulation performance, which helps to save energy when transporting liquids that need to be heated, such as asphalt, molasses or paraffin. At the same time, double-hull oil tankers can improve their safety and prevent oil leakage.

[0003] In order to further improve the safety of oil transportation at sea, the Marine Environment Protection Committee of the International Maritime Organization at its 44th meeting unanimously agreed to regard the adoption of double-hull oil tankers and the gradual phasing out of single-hull oil tankers as an important aspect of measures to eliminate substandard oil tankers. At the 46th meeting of MEPC in April 2001, a phasing-out plan for single-hull oil tankers was formally adopted as an amendment to the International Convention for the Prevention of Pollution from Ships. According to this plan, the latest year for phasing out single-hull oil tankers will be 2017.

[0004] According to Article 19 of the International Convention for the Prevention of Pollution from Ships, requirements for the double hull and double bottom of oil tankers delivered on or after July 6, 1996 are specified. The space between the double hulls is usually used as a ballast tank. The side tanks or compartments should extend to the full depth of the ship's side or from the top of the double bottom to the uppermost deck, regardless of whether the ship's gunwale is rounded. Each side tank or compartment should be arranged so that all cargo holds are located inside the shell plating profile of these tanks or compartments. The cargo hold is inside the inner hull. Since the processing of the curved inner hull is difficult and costly, the inner hull is usually designed as a faceted surface. When designing the inner hull, it is necessary to consider both the manufacturing difficulty and the cargo hold volume. Therefore, the working time and workload for designing the inner hull will increase. In summary, an improved technical solution is needed to address the deficiencies of the above-mentioned prior art. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a method for designing the inner hull of a double-hull ship and a double-hull ship, which can quickly optimize the inner hull form, help to maximize the cargo hold volume, and improve the response speed and design quality in the early stage of design.

[0006] In a first aspect, a method for designing the inner hull of a double-hull ship is provided, including the following steps:

[0007] S1. Offset the outer hull surface of the original double-hull ship inward by a predetermined distance to obtain a new hull surface. Use the new hull surface as the inner hull prototype surface, and use the inner hull prototype surface as the reference for subsequent adjustment of the inner hull surface.

[0008] S2. Calculate the ship's ballast tank capacity of the original inner hull surface.

[0009] S3. When the capacity of the ballast tank meets the design requirements, adjust the original inner hull to approach the inner hull prototype surface. Respectively adjust the shapes and positions of multiple folding surfaces of the original bow inner hull surface, midship inner hull surface, and stern end surface to complete the design of the inner hull surface.

[0010] In one implementation, in step S3, respectively adjust the sides of multiple folding surfaces in the bow inner hull surface, the midship inner hull surface, and the stern end surface, and adjust the shape and position of the folding surface by adjusting the side line type of the folding surface.

[0011] In one implementation, the bow inner hull surface includes a bow bottom surface, a first bow side surface, and a second bow side surface. The first bow side surface is arranged above the second bow side surface.

[0012] In one implementation, the midship inner hull surface includes a midship bottom surface, a first midship side surface, and a second midship side surface. The first midship side surface is arranged above the second midship side surface.

[0013] In one implementation, in step S3, first adjust the position and slope of the side of the first bow side surface.

[0014] In one implementation, in step S3, it further includes the following steps:

[0015] After completing the adjustment of the side of the first bow side surface, select a moving point on the top edge of the second bow side surface. The first bow side surface includes 3 triangular surfaces, and the moving point is the common vertex of the 3 triangular surfaces.

[0016] Adjust the position of the moving point multiple times and obtain the bow cargo hold volume after each adjustment of the moving point. Select the position of the moving point corresponding to the maximum value among multiple bow cargo hold volumes as the common vertex of the 3 triangular surfaces to complete the design of the first bow side surface and the second bow side surface.

[0017] In one implementation, the second bow side surface is a pentagon.

[0018] In one implementation, select the moving point through simulation software.

[0019] According to the second aspect of the present application, a double-hull ship is further provided, including an outer hull surface and an inner hull surface. The inner hull surface is obtained by the inner hull design method of the double-hull ship provided in the first aspect.

[0020] Compared with the prior art, the beneficial effects of the present application are:

[0021] In the technical solution of the present application, multiple folded surfaces of the inner shell surface can be quickly adjusted. When the cargo hold volume is the largest, the inner shell surface is closest to the hull surface. Therefore, while the present application can quickly obtain a design solution, it can also perform an expansion adjustment on the ballast tank capacity of the ship. By changing the second bow side surface, the bow bottom surface from the existing two surfaces to one surface and performing an in-plane inward setting, the number of fold lines of the bow inner shell surface is reduced, simplifying the structural design. By reducing the bent part of the shell, the design of stiffeners or brackets is reduced, and the workload of the design work is reduced. The first bow side surface is set from the existing two quadrilateral surfaces to three triangular surfaces, making the structure of the bow inner shell surface more flexible and capable of increasing the cargo hold volume. Therefore, the present application can not only provide a design method for quickly optimizing the inner shell surface, but also quickly determine the positions and shapes of multiple folded surfaces in the inner shell surface. By being able to create points, lines, surfaces, and enclosed spaces, while quickly obtaining a design solution, it can also perform an expansion adjustment on the ballast tank capacity of the ship. Brief Description of the Drawings

[0022] Figure 1 It is a flowchart of a method for designing the inner shell of a double-hull ship according to an embodiment of the present invention.

[0023] Figure 2 It is a bow sectional view of a double-hull ship in the method for designing the inner shell of a double-hull ship according to an embodiment of the present invention.

[0024] Figure 3 It is a schematic structural diagram of the inner shell in the method for designing the inner shell of a double-hull ship according to an embodiment of the present invention.

[0025] Figure 4 It is a midship sectional view of a double-hull ship in the method for designing the inner shell of a double-hull ship according to an embodiment of the present invention.

[0026] Figure 5 It is a schematic structural diagram of an inner shell after adjusting the position of a moving point in the method for designing the inner shell of a double-hull ship according to an embodiment of the present invention.

[0027] Figure 6 It is another schematic structural diagram of an inner shell after adjusting the position of a moving point in the method for designing the inner shell of a double-hull ship according to an embodiment of the present invention.

[0028] Figure 7 It is still another schematic structural diagram of an inner shell after adjusting the position of a moving point in the method for designing the inner shell of a double-hull ship according to an embodiment of the present invention.

[0029] Figure 8 It is a schematic structural diagram of the inner shell of a double-hull ship in the prior art.

[0030] Among them, the reference numerals are explained as follows:

[0031] 1. Bottom surface of bow; 2. First bow side surface; 3. Second bow side surface; 4. Bottom surface of midship; 5. First midship side surface; 6. Second midship side surface; A. Moving point; 7. Outer shell surface; 8. Inner shell prototype surface; 9. Inner shell surface. Specific embodiments

[0032] The following further elaborates on the specific embodiments of the present invention in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention and are not intended to limit the present invention.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, in the description of the present invention, unless otherwise stated, the meaning of "plural" is two or more.

[0036] The object of this application is all double-hull ships. Therefore, in this embodiment, an oil tanker in double-hull ships is taken as an example for elaboration.

[0037] According to the first aspect of the present application, referring to Figure 1 , first, a method for designing the inner shell of a double-hull ship is provided, including the following steps:

[0038] S1. As shown in Figure 2 , the outer shell surface of the original double-hull ship is offset inward by a predetermined distance to obtain a new ship shell surface; the new ship shell surface is used as the inner shell prototype surface, and the inner shell prototype surface is the basis for subsequent adjustment of the inner shell surface;

[0039] S2. Calculate the ship ballast tank capacity of the original inner shell surface;

[0040] S3. When the ballast tank capacity meets the design requirements, adjust the original inner hull surface to approach the inner hull prototype surface; respectively adjust the shapes and positions of multiple folding surfaces of the original bow inner hull surface, midship inner hull surface, and stern end surface to complete the design of the inner hull surface.

[0041] By using the inner hull design method of the double-hull ship provided in this application for inner hull design, the multiple folding surfaces of the inner hull surface can be quickly adjusted; when the cargo hold volume is the largest, the inner hull surface is closest to the hull surface. Therefore, while this application can quickly obtain a design solution, it can also expand and adjust the ballast tank capacity of the ship.

[0042] In one embodiment, in step S3, respectively adjust the sides of multiple folding surfaces in the bow inner hull surface, midship inner hull surface, and stern end surface, and adjust the shape and position of the folding surface by adjusting the side line type of the folding surface.

[0043] In one embodiment, as Figure 2 and Figure 3 shown, the bow inner hull surface includes a bow bottom surface, a first bow side surface, and a second bow side surface. The first bow side surface is arranged above the second bow side surface.

[0044] Specifically, as Figure 3 shown, along the bow-to-stern direction, the bow bottom surface successively includes L3 and L2, the first bow side surface successively includes L6 and L5, and the second bow side surface successively includes L9 and L8.

[0045] As Figure 3 and Figure 4 shown, the midship inner hull surface includes a midship bottom surface, a first midship side surface, and a second midship side surface. The first midship side surface is arranged above the second midship side surface. Along the bow-to-stern direction, the midship bottom surface successively includes L2 and L1, the first midship side surface successively includes L8 and L7, and the second midship side surface successively includes L5 and L4.

[0046] In step S3, adjusting the sides of each folding surface includes the following steps:

[0047] Refer to the parent ship type and consider the structural design, and adjust the positions of L1 to L9 in sequence. Among them, L1, L2, and L3 are parallel to each other, L4, L5, and L6 are parallel to each other, and L7, L8, and L9 are not parallel to each other. When adjusting, first adjust L8, and then adjust L9.

[0048] In one embodiment, the slope of L8 is correspondingly set with the slope of the bow flat side line of the hull side. Usually, the slope of L8 is close to the slope of the bow flat side line of the hull side.

[0049] In one embodiment, the slope of L9 corresponds to the slope of the flare line type of the bow cross-section, considering making full use of the cabin volume on the side.

[0050] In one embodiment, in step S3, the following steps are further included:

[0051] After completing the side adjustment of the first bow side surface, a moving point is selected on the top edge of the second bow side surface. The first bow side surface includes 3 triangular faces, and the moving point is the common vertex of the 3 triangular faces;

[0052] Adjust the position of the moving point multiple times and obtain the bow cargo hold volume after each adjustment of the moving point. Select the position of the moving point corresponding to the maximum value among the multiple bow cargo hold volumes as the common vertex of the 3 triangular faces to complete the design of the first bow side surface and the second bow side surface.

[0053] It should be noted that the first bow side surface includes 3 faces, and each face is a triangular face. The second bow side surface is a pentagon. There are multiple setting positions for the moving point, such as Figures 5 to 7 As shown, three different setting positions of the moving point are shown. The moving point is the common point of the first bow side surface and the second bow side surface. Therefore, the position of the moving point will affect the volume of the bow cargo hold.

[0054] In one embodiment, the moving point is selected through simulation software.

[0055] Specifically, limit the moving range of the moving point to the plane where the second bow side surface is located, and then adjust the position of the moving point to avoid the situation of plane warping. Obtain the instantaneous cargo hold volume through simulation software after each adjustment. Among the multiple instantaneous cargo hold volumes, select the position of the moving point where the maximum value of the instantaneous cargo hold volume is located as the predetermined position of the moving point in this application. Through this step, a satisfactory volume value can be obtained. Among the multiple possible positions of the moving point, select the position that meets the cargo hold volume requirements.

[0056] In one embodiment, when none of the multiple obtained instantaneous cargo hold volumes meet the requirements, reduce the distance between L6 and the inner shell prototype surface, or adjust the slopes of L4, L5, and L6. Then, perform the simulation of moving point selection again until a satisfactory volume value is obtained.

[0057] In one embodiment, the measured distance w value at any section perpendicular to the side shell plate is greater than or equal to a predetermined value.

[0058] Specifically, the measured distance at any section perpendicular to the side shell plate is the w value, and the predetermined value w 0 is selected according to the MARPOL formula. According to the formula: w = 0.5 + DW / 20000, calculate w 1 , and the unit is m. w 2 = 2.0 m. Take the smaller value between w 1 and w 2 as the predetermined value w0 And the preset value w 0 shall not be less than 1.0.

[0059] According to a second aspect of the present application, there is also provided a double-hull ship, including an outer hull surface and an inner hull surface, wherein the inner hull surface is obtained by the inner hull design method of the double-hull ship provided in the first aspect.

[0060] Specifically, the inner hull surface includes a bow inner hull surface, a midship inner hull surface, and a stern inner hull surface. The bow inner hull surface includes a bow bottom surface, a first bow side surface, and a second bow side surface. The midship inner hull surface includes a midship bottom surface, a first midship side surface, and a second midship side surface.

[0061] In the present application, by changing the second bow side surface, the bow bottom surface, from the existing two surfaces into one surface, and performing an in-plane inward setting, the number of broken lines of the bow inner hull surface is reduced, the structural design is simplified, and by reducing the bent part of the hull, the design of stiffeners or brackets is reduced, and the workload of the design work is reduced. As Figure 3 and Figure 8 shown, the first bow side surface is set from the existing two quadrilateral surfaces to three triangular surfaces, making the structure of the bow inner hull surface more flexible and capable of increasing the cargo hold capacity. And a design method for quickly optimizing the inner hull surface is also provided, which can quickly determine the positions and shapes of multiple folded surfaces in the inner hull surface. By being able to create points, lines, surfaces, and enclosed spaces, while quickly obtaining the design scheme, the ballast tank capacity of the ship can also be adjusted for expansion.

[0062] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can still be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A method for designing the inner hull of a double - hull ship, characterized in that, it includes the following steps: S1. Offset the outer hull surface of the original double - hull ship inward by a predetermined distance to obtain a new hull surface; use the new hull surface as the prototype surface of the inner hull, and use the inner hull prototype surface as the reference for subsequent adjustment of the inner hull surface; S2. Calculate the ship's ballast tank capacity of the original inner hull surface; S3. When the ballast tank capacity meets the design requirements, adjust the original inner hull surface to approach the inner hull prototype surface; respectively adjust the shapes and positions of multiple folding surfaces of the original bow inner hull surface, mid - ship inner hull surface, and stern end face to complete the design of the inner hull surface.

2. The method for designing the inner hull of a double - hull ship according to claim 1, characterized in that, in step S3, respectively adjust the sides of multiple folding surfaces in the bow inner hull surface, the mid - ship inner hull surface, and the stern end face, and adjust the shape and position of the folding surface by adjusting the side - line type of the folding surface.

3. The method for designing the inner hull of a double - hull ship according to claim 2, characterized in that, the bow inner hull surface includes a bow bottom surface, a first bow side surface, and a second bow side surface; the first bow side surface is arranged above the second bow side surface.

4. The method for designing the inner hull of a double - hull ship according to claim 3, characterized in that, the mid - ship inner hull surface includes a mid - ship bottom surface, a first mid - ship side surface, and a second mid - ship side surface; the first mid - ship side surface is arranged above the second mid - ship side surface.

5. The method for designing the inner hull of a double - hull ship according to claim 4, characterized in that, in step S3, first adjust the position and slope of the side of the first bow side surface.

6. The method for designing the inner hull of a double - hull ship according to claim 5, characterized in that, in step S3, it further includes the following steps: After completing the adjustment of the side of the first bow side surface, select a moving point on the top edge of the second bow side surface. The first bow side surface includes 3 triangular surfaces, and the moving point is the common vertex of the 3 triangular surfaces; Adjust the position of the moving point multiple times and obtain the bow cargo hold volume after each adjustment of the moving point. Select the position of the moving point corresponding to the maximum value among multiple bow cargo hold volumes as the common vertex of the 3 triangular surfaces to complete the design of the first bow side surface and the second bow side surface.

7. The method for designing the inner hull of a double - hull ship according to claim 6, characterized in that, the second bow side surface is a pentagon.

8. The method for designing the inner hull of a double - hull ship according to claim 7, characterized in that, select the moving point through simulation software.

9. A double - hull ship, including an outer hull surface and an inner hull surface, characterized in that, the inner hull surface is obtained by the method for designing the inner hull of a double - hull ship according to any one of claims 1 to 8.

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