KR20220060265A - Structure and design process based on assembly module for vessel design - Google Patents

Abstract

Disclosed in the present invention is an assembly module-based structural design process for ship design. The assembly module-based structural design process comprises: a step (S110) of establishing an initial production plan based on prior information of each project; a step (S120) of modeling, by ship design software, a unit view module from which production information is excluded, according to the initial production plan, and building a detailed design integration DB (100) by subdividing the unit view module into assembly modules, in which default items, list items, and argument items are variables and the production information is combined; and a step (S130) of building an integrated base structure (600) in which a plurality of modules in the detailed design integration DB (100) are combined in a ring unit. According to the present invention, the unit view module is subdivided into the assembly modules by using modeling information stored in a production and design integration DB (200) including production capacity information of each shipyard or assembly shop so that the structural design process of the present invention may effectively respond to changes in production plans for ship design.

Description

Assembly module-based structural design process for ship design {STRUCTURE AND DESIGN PROCESS BASED ON ASSEMBLY MODULE FOR VESSEL DESIGN}

The present invention relates to an assembly module-based structural design process for ship design, which can minimize the number of hours of base structure design work by subdividing the module of the unit view into assembly modules to effectively respond to changes in the base structure production plan.

In general, the business design business process for a ship order meets the ship owner's requirements when the ship owner receives the requirements for capacity, speed, draft, displacement, number of ships, delivery date, fatigue life, or main engine (M/E) for the ship. Develop an alignment and review its layout.

After that, a production plan is established to determine the delivery date and production time, and a business design is performed to prepare a technical specification, confirm the alignment and major dimensions, prepare G/A and M/A, prepare a conceptual MS, estimate material cost, direct expenses After confirming the estimate and design time, the final contract is executed if the shipowner’s requirements of technical specifications, delivery date and estimate information are satisfied. .

On the other hand, it is difficult to calculate an accurate value compared to the input time because the initial structure and layout review between the alignment and equipment is determined as an estimated value compared to the actual ship based on 2D drawings.

In addition, the conventional business design, basic design, and detailed structural design are independently performed by the relevant department, so it is difficult to quickly respond to changes in the alignment, tank relocation, or deck level changes that occur in the initial business design stage. , it implies the possibility of errors due to duplicate input.

In addition, it is difficult to flexibly cope with design changes by calculating the structural weight based on the 2D drawings and performing structural modeling for design provision.

In order to overcome this, when creating a module that reflects the information of sales design and basic design, the base structure is created with a combination of cross-section, side, and plan view unit modules to respond flexibly to changes in the initial sales design stage, It should be possible to eliminate the possibility of errors due to duplicate input of design information between departments.

However, when using a view unit module, it is difficult to manage, combine, and change the structure of the module, and there is a problem in that the division efficiency into blocks after the base structure is created is lowered.

Korean Patent Publication No. 1919572 (3D model generation method and device for initial design design. 20181112) Korean Patent Application Laid-Open No. 2013-0119559 (System and method for modeling tree assembly of ship members. 20131101)

The technical task to be achieved by the spirit of the present invention is to subdivide the module of the unit view into assembly modules to effectively respond to changes in the production plan of the base structure, thereby minimizing the number of hours for designing the base structure, based on an assembly module for ship design It is to provide a structural design process.

In order to achieve the above object, the present invention comprises the steps of establishing an initial production plan based on prior information for each project; According to the initial production plan, the module of the unit view in which production information is excluded is modeled by the ship design software, the module of the unit view is the default item, the list item, and the takeover item are variables, and the production information is building a detailed design integrated DB by subdividing it into a combined assembly module; and constructing an integrated base structure combining a plurality of modules in the detailed design integration DB in a ring unit; using modeling information stored in the production design integration DB including production capacity information for each shipyard or assembly shop , provides an assembly module-based structural design process for ship design that subdivides the module of the unit view into the assembly module.

In addition, a structure editor for editing the textual structure syntax information of the assembly module, a template toolbox for generating and changing the default item, the list item, and the argument item, and the assembly module are expressed in a 3D shape A function of searching, modifying, and modeling the subdivided assembly module can be performed through the assembly module editing tool, which consists of a main model view and a sub-model view that expresses a member selected in the main model view in a 3D shape.

In addition, in the template toolbox, the default item, the basic line specification, and the detailed design integrated DB information may be made of an item type including initial division information and linear information interlocked.

In addition, in the template toolbox, the list item may be of an item type set standardized based on production capacity information for each shipyard or assembly shop.

In addition, in the template toolbox, the acquisition item may be formed of an atypical item type based on production capacity information for each shipyard.

In addition, the change of the default item and the list item may convert the structure information into a set text through selection of the item type.

In addition, the argument item may be changed by inputting information corresponding to the item type as text, or by selecting and adding specific text in the structure editor.

In addition, through the bookmark function, it is possible to collectively change the same text with respect to the structure syntax information of the structure editor.

Also, when the argument item is changed, the same text may be collectively changed for the specific structure syntax information selected in the structure editor.

In addition, the detailed design integration DB may be a single integrated DB constructed based on 3D CAD software for business design information, basic design information, and structural design information for ship production.

In addition, the module of the unit view includes structural analysis information of a unit view of a combination of a section module, an elevation module, and a plan module, and material property information including thickness and material information can be modeled in a combined form.

In addition, the assembly module may be modeled in a form in which structural analysis information of the module in the assembly unit, material property information including thickness and material information, and production capacity information for each shipyard or assembly shop are combined.

In addition, it is possible to perform comparative verification of the detailed design integrated DB and the integrated base structure.

According to the present invention, by subdividing the module of the unit view into assembly modules to effectively respond to changes in the production plan of the base structure, there is an effect that can minimize the number of hours for designing the base structure.

In addition, it is possible to efficiently and immediately respond to partial module changes according to various variables of field work conditions after the production design stage, and has the effect of providing accurate 3D modeling information early before the production design stage.

Furthermore, it minimizes human error by applying the item selection method, not the key input method, to the list item, effectively arranges the structure using the initial division information in the cargo hold area, and uses the assembly module to which the operation ability is applied to the base When dividing the structure into blocks, there is an effect of reducing the work of inputting and modifying additional information.

1 shows a flowchart of an assembly module-based structural design process for ship design according to an embodiment of the present invention.
FIG. 2 illustrates an assembly module editing tool of the assembly module-based structural design process for the ship design of FIG. 1 .
3 to 5 each exemplify a process of changing each item by the assembly module editing tool of FIG. 2 .
6 illustrates a modeling process of the assembly module-based structural design process of FIG. 1 .

Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

Referring to FIG. 1 , the assembly module-based structural design process for ship design according to this embodiment includes the steps of establishing an initial production plan based on prior information for each project (S110), and according to the initial production plan, ship design By software, the module of the unit view is modeled in a form in which production information is excluded, and the module of the unit view is subdivided into an assembly module in which the default item, list item, and argument item are variables, and production information is combined, Including the step (S120) of building the integrated design DB 100 (S120) and the step (S130) of building an integrated base structure 600 combining a plurality of modules in the detailed design integrated DB 100 in a ring unit (S130), the shipyard By using the modeling information stored in the production design integration DB 200 including production capacity information for each star or assembly shop, the module of the unit view is subdivided into assembly modules, so as to effectively respond to changes in the production plan. do.

Hereinafter, with reference to FIGS. 1 to 6 , an assembly module-based structural design process for designing a ship having the above configuration will be described in detail as follows.

First of all, in the case of a new project, in the initial production plan establishment step (S110), the design schedule for each block and the production schedule and the initial production plan of the production plan based on various prior information for each ship project for the ship manufacturing process to establish

Subsequently, in the detailed design integration DB construction step (S120), according to the initial production plan, by the ship design software, for example, ship design 3D modeling software for shipbuilding such as Tribone, AM or NAPA, the production design step (S140) Models the module of the unit view in a form in which the production information is excluded (S121), and sets the module of the unit view to the default item, list item, and argument item as variables and subdivided into modules (hereinafter, assembly modules) of an assembly unit in a form in which production information after the production design step (S140) is combined (S122), and a detailed design integration DB 100 is built.

Here, the module of the unit view, as illustrated in (a) to (c) of FIG. 6 , a regular section module 310 that is a hold area and an elevation module Each module can be modeled by combining structural analysis information of a unit view of a combination of ) 410 and a plan module 510, and material property information including thickness and material information.

In addition, the assembly module will be modeled in a combined form of structural analysis information of the module of the assembly unit, material property information including thickness and material information, and basic production information according to yard capacity for each shipyard or assembly shop. can

On the other hand, due to the combination of the regular cross-sectional structure module 310, the side structure module 410, and the planar structure module 510, it is possible to easily change the module combination.

Specifically, the cross-sectional structure module 310 is a typical transverse bulkhead (TYP TRANS BHD SECTION) 311, FWD TRANS WEB SECTION (312) based on a Very Large Crude Oil Carrier (VLCC). ), single or multiple representative transverse frames (TYP(S) TRANS WEB SECTION) (313), aft transverse frames (AFT TRANS WEB SECTION) (314) and SWASH BHD SECTION (315). there is.

In addition, based on the VLCC, the side structure module 410 includes a side shell side structure (SIDE SHELL ELEV) 411, an inner hull longitudinal bulkhead side structure (INNER HULL LONGITUDINAL BHD ELEV) 412, and a longitudinal bulkhead side structure (LONGITUDINAL). BHD ELEV) 413 .

In addition, based on the VLCC, the planar structure module 510 is a deck plan (DECK PLAN) (511), a stringer plan (STRINGER PLAN) (512), an inner bottom plan (INNER BOTTOM PLAN) (513), and a bottom shell plan (BOTTOM) SHELL PLAN) 514 .

Accordingly, by changing the ranges and combinations of the cross-sectional structure module 310, the side structure module 410, and the planar structure module 510 of the above-described structure in the direction of the red arrow, respectively, a ring unit combination in a form in which a plurality of modules are combined Since it is possible to model the base structure 600 of the design change-related work can be simplified.

On the other hand, the detailed design integration DB 100 may be a single integrated DB constructed based on 3D CAD software of business design information, basic design information, and structural design information for ship production, and thus, the inter-departmental, detailed design integration DB By sharing (100), errors due to redundant input of information are prevented, and upper design information can be input into the design integration DB in connection with lower design information.

For example, based on 3D CAD software, sales design information is sequentially input and stored in the detailed design integrated DB 100, and subsequently, the basic design information is linked with the previously inputted business design information to the detailed design integrated DB 100 ) to input and store, and subsequently, in connection with the previously input basic design information, the structural design information is input and stored into the detailed design integration DB 100, and design work is performed as a flow work linked rather than independent design work. to proceed with

That is, by additionally inputting basic design information to the DB in which the business design information is input, and additionally inputting structural design information to the DB in which the basic design information is input, the detailed design integration DB 100 is built, and the upper design information When inputting or modifying human structural design information or basic design information, the basic design information or business design information, which are sub-level design information, is input or modified in connection, thereby eliminating the number of duplicate design work hours and converting it into a database without separate drawing work. The corresponding design information can be transmitted to sub-departments.

Here, the business design information includes initial division information, linear information, weight information, main dimensions, draft, capacity, and displacement, and structural design information includes structural shape, structure location, thickness information, and materials centered on the cargo hold area. Including information, welding angle information, and opening information, it is stored in the lower structural modeling DB of the detailed design integrated DB 100, and the basic design information is trim (difference between bow and stern draft) and stability. Including the information, it is possible to calculate the longitudinal strength (longistrength) and draft information through this, and store it in the lower calculation information DB of the detailed design integration DB (100).

For reference, the related work flow of sales design creates the initial design integration DB of 3D CAD software, and linear information and initial division information (Longi & Frame Spacing, Block No., etc.) determined at the relevant business stage Input deck level and tank and main parts arrangement information, extract G/A drawings for contract using 2D drawing extraction function from 3D model, extract estimated weight from 3D model, Regardless of the possession of similar ship design information, accurate data is extracted from the 3D model to calculate the structure mass and material cost, and the large ship owner business is performed through reliable data.

In addition, for the basic design related work flow, additional work is carried out in the design integrated DB worked on in the sales design. Calculating trim and restoring force in the design integration DB, modeling the compartments required for G/A drawings, extracting G/A drawings from 3D models, extracting weights from 3D models, performing additional work in structural design, Structural strength is calculated based on trim and restoration force calculations, and structural strength is calculated using the angular classification rules built into 3D CAD software. Information to be included in the existing keyplan drawings based on structural strength calculations performs modeling work using 3D CAD software, converts 3D models to each classification program and scantling them, converts 3D models into FE models for structural analysis/fatigue analysis, not 2D drawings, Carry out shipowner/classification work through 3D model.

In addition, for the related work flow of structural design, additional work is carried out in the design integration DB worked on in the basic design, 3D modeling is performed using 3D CAD software for information necessary for each structural drawing, and the necessary structural strength verification is It is calculated based on each classification rule included in the 3D CAD software, and based on the completed 3D model, it is used for the arrangement of equipment in the design design, the 3D model is converted into an FE model for the structural analysis of the fore and aft, and the 2D drawing is Instead, it carries out shipowner/classification tasks through 3D models.

On the other hand, to utilize the modeling information in the production design step (S140) in the detailed design step for building the detailed design integration DB 100, which is the upper design step, and to immediately reflect the design changes according to the production plan change, view It is necessary to subdivide the module of the unit into an assembly module in which the production information after the production design step (S140) is combined.

Accordingly, by using the modeling information stored in the production design integration DB 200 including the production capacity information for each shipyard or for each assembly shop, it is possible to subdivide the module of the unit view into the assembly module (S122).

FIG. 2 illustrates an assembly module editing tool of the assembly module-based structural design process for ship design of FIG. 1 . Referring to FIG. 1 , the assembly module editing tool edits the structure syntax information (scheme) in text form of the assembly module. A scheme editor 210, a template tool box 220 for creating and changing a default item, a list item, and an argument item, respectively, and a main model expressing the assembly module in a 3D shape A message box for outputting a view (main model view) 230, a sub model view (240) representing a member selected in the main model view (230) in a 3D shape, and other related messages (message box) ) 250 , it is possible to search for, modify, and model the subdivided assembly module through the assembly module editing tool.

A process of changing each item by the assembly module editing tool will be described with reference to FIGS. 3 to 5 , respectively.

The template toolbox 220 specifies an input type selection window 221 that performs a function of designating an item conversion type of a default or a list when using an assembly module, and an item type of text to be converted It may be composed of an Item Type selection window 222 performing a function to perform a function, and an Argument input window 223 performing a function of converting text by inputting a text desired by the user.

Here, the default item consists of an item type including basic line specifications, initial division information interlocked with design information of the detailed design integrated DB 100 and linear information (PROJECT ID, PROJECT NO., etc.), and is a set value. Text conversion is performed, and list items consist of item types that are standardized and set based on capacity information for each shipyard or assembly shop. The text is converted by inputting the text desired by the user.

For reference, an atypical argument item is an item without regularity and repeatability, and means an item that can be freely converted according to the situation of the user of the ship.

That is, to change the default item and list item, an item of an item type subordinate to the item conversion type specified by the input type selection window 221 is selected through the item type selection window 222, and the structure of the selected item is selected. This can be done by converting the information into set text.

For example, as illustrated in (a) of FIG. 3 , a text 101 to be changed is selected in the structure editor 210 , a default item is selected in the input type selection window 221 , and an item type is selected accordingly When an item of an item type subordinate to the window 222 (Block, ProjBlk, ProjID, ProjNo, etc.) is selected, the text of '101' is '{"T":"Default","IT":"Blcok"} ', and as illustrated in (a) of FIG. 4 , select the text (SOVN) to be changed in the structure editor 210, select a list item in the input type selection window 221, and According to the item type selection window 222, if you select an item of an item type (Block, ProjBlk, ProjID, ProjNo, Surface, RSO, AS2, AS4, BEV, BVS, BVT, COR, DATA_TYPE, etc.) subordinate to the item type selection window 222, 'SOVN ' is changed to '{"T":"List","IT":"BVT"}'.

On the other hand, as shown in (a) of FIG. 5 , the argument item is changed by the user directly inputting information corresponding to the item type in the argument input window 223 as text (CUT=2231,100/'101-TB561'), As shown in FIG. 5B , a specific text (CUT=2231,100/'101-TB561') of the structure editor 210 is selected, added, changed, and registered as an argument list in the argument input window 223 .

Here, as illustrated in (c) of FIG. 5 , after registration of the argument list, the text corresponding to the registered list can be changed from the cursor position of the structure syntax of the structure editor 210 or the bookmark position inserted into the structure syntax. there is.

In addition, when registering the argument list, one number is assigned to each argument, and through this, the stored argument can be recognized when the template is used and information can be obtained.

In addition, through the bookmark function, it is possible to collectively change the same text with respect to the structure syntax information of the structure editor 210 .

For example, as illustrated in (b) of FIG. 3, the text of the same '101' in the structure syntax information in the bookmark is all '{"T":"Default","IT":"Blcok"}' to complete the change to '{"T":"List","IT":"BVT"}" It is also possible to provide convenience to users by completing changes in batches.

On the other hand, when changing the argument item, as mentioned above, the same text of the structure syntax information in the bookmark of the default item and the list item may be collectively changed, and as illustrated in FIG. 5(d), the structure It is also possible to collectively change the same text with respect to the selected specific structure syntax information of the editor 210 .

Accordingly, when selecting and changing default items and list items, human errors can be eliminated by the item selection method rather than the key input method, and modules and base structures are created with the search, modification and use functions of the subdivided assembly module. can be performed quickly and accurately, and it can be subdivided into assembly modules so that only necessary module parts can be modified.

Subsequently, in the base structure modeling step (S130), as illustrated in (d) of FIG. 6, the integrated base structure 600 that combines a number of modeled modules in the detailed design integration DB 100 in a ring unit. build

On the other hand, as described above, by performing comparative verification between the detailed design integration DB 100 and the integrated base structure 600 through input and change of default items, list items, and argument items, detailed design integration DB 100 It is also possible to determine whether there is a match between the linear information and the base structure.

Thereafter, the production design step (S140) is a step of generating block information from the base structure 600, performing block division according to the operation capacity of each dock and assembly shop (141), and determining the assembly shop and the mounting method (142).

That is, in the block division performing step (S141), block information is generated from the base structure 600 on the detailed design having structural analysis information and material property information, detailed assembly procedure (DAP) and assembly shop operation capability ( capacity) to generate assembly information, and to generate member information in conjunction with mill characteristics and the operation capability of assembly shop equipment.

Here, according to the variables that occur after the initial production plan is established, block information is generated according to the operation capability of the standardized on-site workshop, the dock and the assembly shop, to automate block division, or to Blocks can be manually partitioned by

In addition, in the production design step (S140), block division is performed, detailed assembly procedures are applied, welding shrinkage values and 2-week finishing control chart, abacus processing tips, temporary access, and hole plan lifting (hole) plan lifting) NC reflectivity is applied.

In addition, in the assembly shop and the mounting method determination step (S142), the assembly shop of each sub-workshop/outside assembly partner/foreign partner is determined, and the ring PE/floating dock/dock ) can be determined.

Thereafter, according to the middle scheduling plan, which is the dock and assembly shop schedule, assembly/processing drawing work specialized for the line is performed (S151), and field work of the dock and assembly shop is performed (S153).

Here, after performing assembly/processing drawing work specialized for the ship (S151), it is fed back to the production design step (S140) when the mid-schedule is changed, and blocks, assemblies, and pieces can be divided and extracted by interlocking with the changed mid-schedule ( S152).

Accordingly, it is possible to organically respond to changes in the mid-schedule after design modeling work based on the initial mid-schedule information of the dock and assembly shop by reflecting the production information for each mid-schedule, and the division of blocks, assemblies, and pieces linked to the changed mid-schedule and to enable extraction.

In addition, in the case of repeating the project, the module of the unit view is modeled by the ship design software based on the performance ship, and the modeling information accumulated in the performance ship can be utilized in the prior design.

Therefore, by the configuration of the assembly module-based structural design process for ship design as described above, the module of the unit view is subdivided into assembly modules to effectively respond to changes in the base structure production plan, thereby minimizing the number of hours of base structure design work and , can efficiently and immediately respond to partial module changes according to various variables of field work conditions after the production design stage, can provide accurate 3D modeling information early before the production design stage, list items, Minimize human error by applying the item selection method instead of the key input method, effectively arrange the structure by using the initial division information in the cargo hold area, and use the assembly module to which the operation ability is applied to add when dividing the base structure into blocks Information input and correction work can be reduced.

In the above, the present invention has been described with reference to the embodiments shown in the drawings. However, the present invention is not limited thereto, and various modifications or other embodiments within the scope equivalent to the present invention are possible by those of ordinary skill in the art to which the present invention pertains. Accordingly, the true scope of protection of the present invention should be defined by the following claims.

S110: Initial production plan establishment phase S120: Detailed design integration DB establishment phase
S121: unit view module modeling step S122: assembly module subdivision step
S130: Base structure modeling stage S140: Production design stage
S141: Block division performing step S142: Assembling shop and mounting effort determination step
S151: Assembly/processing drawing work execution stage S153: On-site self-employment execution stage
100: detailed design integration DB 200: production design integration DB
210: structure editor 220: template toolbox
230: main model view 240: sub model view
250: message box 310: cross-sectional structure module
311: Representative transverse bulkhead 312: Transverse frame at the fore end
313: Representative transverse ribs 314: Stern transverse ribs
315: water bulkhead 410: side structure module
411: side shell side structure 412: inner hull longitudinal bulkhead side structure
413: longitudinal bulkhead side structure 510: flat structure module
511: deck plan 512: stringer plan
513: bottom plan 514: bottom shell plan
600: base structure

Claims (13)

establishing an initial production plan based on prior information for each project;
According to the initial production plan, the module of the unit view in which production information is excluded is modeled by the ship design software, the module of the unit view is the default item, the list item, and the takeover item are variables, and the production information is building a detailed design integrated DB by subdividing it into a combined assembly module; and
Constructing an integrated base structure combining a plurality of modules in the detailed design integrated DB in a ring unit; including,
subdividing the module of the unit view into the assembly module by using the modeling information stored in the production design integration DB including the production capacity information for each shipyard or for each assembly shop,
Assembly module-based structural design process for ship design. The method of claim 1,
A structure editor for editing the textual structure syntax information of the assembly module, a template toolbox for creating and changing the default item, the list item, and the argument item, and a note for expressing the assembly module in a 3D shape A model view and a sub-model view that expresses the member selected in the main model view in a 3D shape, characterized in that the sub-divided assembly module is searched for, modified and modeled through an assembly module editing tool,
Assembly module-based structural design process for ship design. 3. The method of claim 2,
In the template toolbox,
The default item is characterized in that it consists of an item type including initial division information and linear information interlocked with the basic line specification, and the detailed design integrated DB information,
Assembly module-based structural design process for ship design. 4. The method of claim 3,
In the template toolbox,
The list item is characterized in that it consists of an item type set standardized based on the production capacity information for each shipyard or assembly shop,
Assembly module-based structural design process for ship design. 5. The method of claim 4,
In the template toolbox,
The acquisition item is characterized in that it consists of an atypical item type based on the production capacity information for each shipyard,
Assembly module-based structural design process for ship design. 6. The method of claim 5,
The change of the default item and the list item is characterized in that the structure information is converted into set text through selection of the item type,
Assembly module-based structural design process for ship design. 7. The method of claim 6,
The argument item is changed by inputting information corresponding to the item type as text, or by selecting and adding specific text in the structure editor,
Assembly module-based structural design process for ship design. 8. The method of claim 7,
Characterized in that through the bookmark function, the same text with respect to the structure syntax information of the structure editor is collectively changed,
Assembly module-based structural design process for ship design. 9. The method of claim 8,
Characterized in that when the argument item is changed, the same text is collectively changed with respect to the specific structure syntax information selected in the structure editor,
Assembly module-based structural design process for ship design. The method of claim 1,
The detailed design integration DB is characterized in that it is a single integrated DB constructed based on 3D CAD software of business design information, basic design information, and structural design information for ship production,
Assembly module-based structural design process for ship design. The method of claim 1,
The module of the unit view combines the structural analysis information of the unit view of a combination of a section module, an elevation module, and a plan module, and material property information including thickness and material information. characterized in that it is modeled in the form
Assembly module-based structural design process for ship design. The method of claim 1,
The assembly module is characterized in that it is modeled in a combined form of structural analysis information of the module of the assembly unit, material property information including thickness and material information, and production capacity information for each shipyard or assembly shop,
Assembly module-based structural design process for ship design. The method of claim 1,
Characterized in performing comparative verification of the detailed design integrated DB and the integrated base structure,
Assembly module-based structural design process for ship design.

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