Digital Computer Concept and Practice, Spring 2014, Myung-Il Roh 1
C++ Programming
Ch. 0 Computerization in Shipbuilding
Lecture Note of Digital Computer Concept and Practice
Spring 2014
Myung-Il Roh
Department of Naval Architecture and Ocean Engineering
Seoul National University
Digital Computer Concept and Practice, Spring 2014, Myung-Il Roh 2
Ch. 0 Computerization in Shipbuilding
Digital Computer Concept and Practice, Spring 2014, Myung-Il Roh 3
Contents
þ Overview
þ Hull structural modeling method considering the relationship between hull structural parts
þ Rapid pipe modeling method considering the relationship with the hull structure
þ Generation of the structural analysis model using the hull structural model
þ Generation of the production material information for process planning and scheduling using the hull structural model
þ Conclusions
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Shipbuilding process
Deadweight 300,000ton VLCC (Very Large Crude oil Carrier)
* For the deadweight 300,000ton VLCC, L: 320.0m, B: 58.0m, D: 31.2m
* For the 63 building in Korea, 249.0m on the ground
* Reference: DSME Co., Ltd.
S/C K/L L/C D/L
Contract
-9 -6 -3 0 +3 +6 +9
Steel cutting Assembly
Design
(Initial/Detailed/Production)
Outfitting
Painting Erection Launching
Automation technologies for reducing the
construction period
Initial design
Detailed design
Production design
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What is a “Hull form”?
þ Hull form
n Outer shape of the hull that is streamlined in order to satisfy
requirements of the ship owner such as a deadweight, ship speed, and so on
n Like a skin of human
þ Hull form design
n Design task that designs a hull form
Hull form model of the VLCC(Very Large Crude oil Carrier)
Wireframe model Surface model
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What is a “Compartment”?
6
þ Compartment
n Space to load cargos in the ship
þ Compartment modeling
n Design task that divides the interior parts of a hull form into a number of compartments
þ Ship calculation
n Design task that evaluates whether the ship satisfies the required
cargo capacity by ship owner and, at the same time, the international regulations such as MARPOL and SOLAS or not
þ General arrangement design
n Compartment modeling + Ship calculation
expanded compartment model
전개된 구획 모델Compartment model of the VLCC
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What is a “Hull structure”?
þ Hull structure
n Body of a ship comprising of a number of hull structural parts such as plates, stiffeners, brackets, and so on
n Like bones of human
þ Hull structural design
n Design task that determines the specifications of the hull structural parts such as the size, material, and so on
Hull structural model of the VLCC
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Product model vs. 2D drawing
þ Product model
n 3D CAD(Computer-Aided Design) model having shipbuilding meaning
n Electronic and digital data
n Possible to be automatically transformed into other types of product models, such as hull structural model Û structural analysis model
n Hull form model, compartment model, hull structural model
þ 2D drawings
n Hard-copy model having shipbuilding meaning
n Off-line and analog data
n Very hard to be transformed into other types of product models
n Conventional data sharing method in shipyards
Hull form model of the deadweight 300,000ton VLCC
Transverse web frame drawing of the deadweight
300,000ton VLCC
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Various applications of the hull structural model
INPUT
Key plans(lines, GA, midship section, CONPRO, shell expansion)
which are generated by a designer
Block division model of the deadweight 300,000ton VLCC
Generation of the production
material
information of a building block
Æ
Generation
of the global/local
structural analysis model
Reference model for generating the piping model Accurate
calculation of the weight of the hull structure
Æ
Accurate
calculation of the light weight and the weight distribution
Hull structural model
of the deadweight 300,000ton VLCC(Very Large Crude oil Carrier)
OUTPUT
È Hull structural modeling system
(a kind of a word processor)
Aspect of
conceptual design
Aspect of
structural analysis
Aspect of outfitting design
Aspect of
production planning
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Some applications of ship design and production automation using a product model
Design and
Production Automation
2 Pipe modeling
Generation of the structural analysis model 3
4 Process planning and scheduling Hull structural modeling
1
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Hull structural modeling method considering the relationship
between hull structural parts
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Present hull structural design practice in Korean shipbuilding companies
* Myung-Il Roh, Kyu-Yeul Lee, "An Initial Hull Structural Modeling System for Computer-Aided Process Planning in Shipbuilding", Advances in Engineering Software, Vol. 37, No. 7, pp.457-476, 2006
IntelliShip system TRIBON system
Detailed model of a whole hull structure
Production drawings
Production drawings Production model of
a building block unit Hull
Outfitting Block division drawing
Block division drawing
Production model of a building block unit Hull
Outfitting
2D drawings The CAD model can be generated at the production design stage.
Initial design Detailed design Production design
2D drawings
The CAD model can be generated at the detailed design stage.
New initial hull
structural modeling
system
Initial model of a whole hull structure
Detailed model of a whole hull structure
The CAD model can be generated at the initial design stage.
Generation of the production material information
Future works
Generation of the global/hold
structural analysis model
Generation of the piping model
related with the hull structure
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Hull structural modeling of
the deadweight 300,000ton VLCC (‘300K VLCC’)
Enlarged view of the midship region Typical transverse
web frame drawing
Inside of the cargo hold region
* Principal dimension of the deadweight 300,000ton VLCC
Lbp: 320.0m, B: 58.0m, D: 31.2m, Td: 20.8m, Ts: 20.8m, Cb: 0.8086
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Inside of the cargo hold region
Hull structural modeling of the deadweight 73,000ton bulk carrier (‘73K BC’)
* Principal dimension of the deadweight 73,000ton bulk carrier
Lbp: 217.0m, B: 32.25m, D: 19.0m, Td: 12.4m, Ts: 13.75m, Cb: 0.8394
Enlarged view of the midship region
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Hull structural modeling of the cargo capacity 200,000CBM LNG carrier (‘200K LNGC’)
Enlarged view of the midship region
Inside of the cargo hold region
* Principal dimension of the cargo capacity 200,000CBM LNG carrier Lbp: 299.8m, B: 48.5m, D: 27.1m, Td: 12.0m, Ts: 13.0m, Cb: 0.7648
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Rapid pipe modeling method considering the relationship
with the hull structure
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Present piping design practice
in Korean shipbuilding companies
P&ID(Piping and Instrument Diagram, non-scaled topology data)
Initial design Detailed design
Extsting
method
1Manual pipe routing
Hull structural model Piping model
New method
Hull structural model
2Hull structural model
Pipe model having the relationship
with the hull structure at early design stage
Edit design of the piping model
for series ships Early generation
of the piping model having the relationship with the hull structure
+
* 1: TRIBON and IntelliShip systems
* 2: Myung-Il Roh, Kyu-Yeul Lee, "An Initial Hull Structural Modeling System for Computer-Aided Process Planning in Shipbuilding", Advances in Engineering Software, Vol. 37, No. 7, pp.457-476, 2006
floor
C L 2
ndDeck
1
stDeck
EQ#1
EQ#2
Decision of In/out positions of each pipe
based on P&ID and 2D drawings
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Pipe modeling of the deadweight 300,000ton VLCC - Plan view
300K VLCC
Plan view
x y z
Result of the rapid pipe modeling using the developed method
Result of the manual piping
modeling using the TRIBON system
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Pipe modeling of the deadweight 300,000ton VLCC - Section & ISO view
300K VLCC
300K VLCC
Result of the rapid pipe modeling using the developed method Result of the manual pipe modeling using the TRIBON system
Result of the rapid pipe modeling using the developed method
Result of the manual pipe modeling using the TRIBON system
Section view
x y
z
ISO view
x
y
z
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Edit design of the piping model of the 320K VLCC using that of the 300K VLCC
320K VLCC
Plan view x
y z
6 6 5 0
1 3 3 0 0 L 7
L 1 4 -6 6 5 0 -1 3 3 0 0 L -7
L -1 4
Plan view x
y
z L o n g it u d in a l sp a c e (9 1 0 m m ) 300K VLCC
6 3 7 0
1 2 7 4 0 L 7
L 1 4 -6 3 7 0 -1 2 7 4 0 L -7
L -1 4 L o n g it u d in a l sp a c e (9 5 0 m m )
ISO view x
y z
300K VLCC
C L
ISO view x
y z
320K VLCC
C L
C L
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Result of the edit design of the piping model of the 320K VLCC using that of the 300K VLCC
320K VLCC 300K VLCC
Plan view x
y
z Plan view
x y z
C L
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Generation of
the structural analysis model
using the hull structural model
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Background
• Generation of the hull structural model by manual generation of a designer
• Generation method of the structural analysis model using the hull structural model
Æ Æ
Generation of nodes (manual generation)
Æ
Generation of elements or meshes (manual generation)
Input of properties of the elements (manual generation)
material thickness
…
2D drawing
ü Waste of much time and man-hours Æ global structural analysis model: about 1 month, hold structural analysis model: about 3 days
ü Existence of errors by means of manual generation
ü Minimization of errors through the maintenance of the integrity of nodes and elements between hull structural parts
ü Minimization of the post touch-up task by automatically exporting nodes, elements, properties, and so on to commercial structural analysis programs(e.g., PATRAN, ANSYS, etc.)
Current design practice of generating the structural analysis model
copy
ü Difficulty of maintaining the integrity of nodes and elements between hull structural parts
Objective
Hold structural analysis model (
finite element model)ü Reduction of work time for generating the structural analysis model
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Generation of the hull structural model of the deadweight 300,000ton VLCC
Enlarged view of the midship region
Inside of the cargo hold region
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Generation of the global structural analysis model of the deadweight 300,000ton VLCC
Global structural analysis model of the 300K VLCC by using the developed method
(Shell element, 1-D element, whole region)
Global structural analysis model of the 300K VLCC by using the developed method
(Shell element, 1-D element, fore body region)
Global structural analysis model of the 300K VLCC by using the developed method
(Shell element, 1-D element, midship region) Global structural analysis model of the 300K VLCC
by using the developed method
(Shell element, 1-D element, after body region)
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Generation of the hold structural analysis model of the deadweight 300,000ton VLCC
Hold structural analysis model of the 300K VLCC by using the developed method
(Shell element, 1-D element, 2 cargo hold region)
Hold structural analysis model of the 300K VLCC by using the developed method
(Shell element, 1-D element, hiding of a deck)
Hold structural analysis model of the 300K VLCC by using the developed method
(Shell element, 1-D element, hiding of a deck)
Hold structural analysis model of the 300K VLCC by using the developed method
(Shell element, 1-D element, inside of the cargo hold region)
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Generation of the production material information for process planning and
scheduling using the hull structural
model
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Shipbuilding process
Deadweight 300,000ton
VLCC(Very Large Crude oil Carrier)
Initial/detailed/production
design
VLCCs under construction
Steel cutting
Assembly/outfitting/painting
Erection
Launching/sea trial/delivery
Block division drawing
Dock
Production material information of a building block
(weight, center of gravity, painting area, joint length, etc.)
Block erection
Initial process planning and
scheduling
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Summary of the generation of the production material information for process planning and scheduling
Hull form model of
the deadweight 300,000ton VLCC
Hull structural model of the deadweight 300,000ton VLCC
Block division model of the deadweight 300,000ton VLCC
Hull structural
modeling
Production material Information
of a building block
Application example of the deadweight 300,000ton VLCC
Block division
Æ
Æ
Æ
Å Å
Visualization of the process of the block erection
Erection material information
Simulation of the block
erection
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Hull structural modeling of
the deadweight 300,000ton VLCC(‘300K VLCC’)
Enlarged view of the midship region Typical transverse
web frame drawing
Inside of the cargo hold region
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Generation of the production material information of a building block of the 300K VLCC (1/3)
Building block
in the midship region
Rectangular solid defined for dividing the hull structure
Item Value
Weight 301.4ton
Center of gravity (182.0, 21.4, 3.0)
Painting area 3,845.3m2
Joint length between building blocks 294.0m Joint length in the building block 1,349.8m
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Generation of the production material information of a building block of the 300K VLCC (2/3)
Block division by using a subdivision model
It is possible to define building blocks
which are hard to define with a rectangular solid.
Subdivision model defined for
dividing the hull structure
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Building block model by using the TRIBON system
Building block model
by using the developed system
Difference in the weight = 0.85%
* It was difficult to obtain the non-filled data in the table of the TRIBON system as they are confidential information to the corresponding shipbuilding company.
Item Value
Weight 304ton
Center of gravity -
Painting area -
Joint length between building blocks - Joint length in the building block -
Item Value
Weight 301.4ton
Center of gravity (182.0, 21.4, 3.0)
Painting area 3,845.3m2
Joint length between building blocks 294.0m Joint length in the building block 1,349.8m
Generation of the production material information of
a building block of the 300K VLCC (3/3)
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Block erection of the 300K VLCC
by the semi-tandem construction method
Block erection of the 300K VLCC by the floor-type construction method
History of the erection joint length by the tandem construction method
0 50 100 150 200 250 300 350 400
1 11 21 31 41 51 61 71 81
Erection event(Number of erection blocks)
Erection JL(m)
History of the erection joint length by the floor-type construction method
0 50 100 150 200 250 300 350 400
1 11 21 31 41 51 61 71 81
Erection event(Number of erection blocks)
Erection JL(m)
Æ
Å
Floating
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