My original presentation was made in Japanese but I've translated the slide to English. FEA in ship design process is a bit different from other industries. I've summarized current situation about FEA and 3D-based-design in our industry.

1. 1 © NAPA
NAPA Steel and HyperWorks
will break new ground for structure design
Takashi Murakami
NAPA Japan Ltd.
5th August 2016

2. 2 © NAPA
Agenda
Brief introduction of NAPA Group
FE Analysis in ship design process
Efficiency gain with NAPA & HyperWorks
Update info. of NAPA Designer & Drafting
Conclusion remarks
1
2
3
4
5

3. 3 © NAPA
NAPA Group
Software house for maritime
Founded in Finland, 1989
12 countries, 180 employees globally
95% of ships are designed using NAPA
Installed on over 2,000 vessels
Owned by ClassNK from 2014

4. 4 © NAPA
NAPA Group
Design
supporting solutions
Operation
supporting solution
 Lines
 Hydrostatics / Hydrodynamics
 Structure Design
 Final Booklet
 ...
 Performance Monitoring
 Voyage Optimization
 Electric Logbook
 Loading Computer
 ...

5. 5 © NAPA
NAPA Design Solutions
Naval Architecture
Basic design module
Lines, Hydro, Compartment Arr. etc.
3D
Model
43
users
NAPA Steel
Structure design module
Drawing, Weight, Structure Study etc.
14
users
Japan
Japan
* Number of users is counted organization-based

6. 6 © NAPA
NAPA Steel
Lines
Compartment
Weight, welding
Rule calc.
PrimeShip data linkage
FE mesh
PrimeShip data linkage
HCSR
Analysis
3D model
Block div.
3 sides
alignment
Vibration, Acoustic
Builder’s check
Stiff. Landing
Customization
IGES export Production design
Data takeover
* All features are used in actual design project
NAPA Steel
CAD export

7. 7 © NAPA7 © NAPA
FE Analysis in ship design process

8. 8 © NAPA
 Rule
 Dimensions
 Hydro
 Arrangement
 E/R, M/E
 Power
 Speed
 FOC
 etc...
FEA in ship design process
Hull form Contract
 Spec
 GA
 Accom. layout
 ER layout
 Trim
 Stability
 Long. strength
 Maker list
 etc...
Detail
 Structure
Detail shape
Strength
• Rules
• FEA
Vibration
Steel weight
 Outfitting
 Piping
 Electrics
Market Owner Class
Construction
 Production
 Steel order
 Mech. order
 Final Drw.
 Final booklet
Factory
NAPA Naval Architecture
NAPA Steel

9. 9 © NAPA
FEA is getting important
FEA: Increasing importance & workload
Stricter rules
HCSR
Rising CAE
Simulation-
based design
Front-loaded
Changing design
process to
reduce cost
Breakaway from “Experience-based engineering”

10. 10 © NAPA
General FEA process
Pre Processing
Data preparation
Main Processing
Make matrix and computation
Post Processing
Decision making by designer
●
●
●

11. 11 © NAPA11 © NAPA
Efficiency gain
with NAPA and HyperWorks

12. 12 © NAPA
Discussion of better FEA process
Specific requirement in ship design
3D model utilization

13. 13 © NAPA
Characteristics of ship design
Curved geometry
 Geometry of hull surface
Stiffened plate
 Shell mesh at molded surface
 Plate thickness
 Stiffener scantling
 Stiffener idealization
Build-to-order industry
 Strict process control is needed
 Never postpone a delivery!
Class approval
 Detailed assessment rules
 Easy to standardize the
working process

14. 14 © NAPA
Meshing of curved surface
NAPA makes FE mesh of curved hull form, easily

15. 15 © NAPA
Stiffener idealization
PBEAM
(for coarse Mesh)
Web as CQUAD
(for fine mesh)
Shell only meshing
(for very fine mesh)
One NAPA Steel model

16. 16 © NAPA
Opening idealization
One NAPA Steel model
No opening
Omit element
Rectangle shape
Reduce thickness
（CSR-T）

17. 17 © NAPA
3D model utilization
Amend many times
until class approval
ProductionDetailStructureBasic
Not planned 3D based design will increase workload
NAPA Hull form, Arrangement
3D CAD Drawing, Weight
HyperWorks HCSR, Vibration etc...
PrimeShip Rule calc.
Production 3D
Working plan
Master drawing
Outfitting
Piping
How many 3D
models are needed...
Give me a break.

18. 18 © NAPA
NAPA Design Solutions
Project start
Displacement
CFD
Arrangement
Capacities
Loading Condition
Stability
Intact, Damage,
Probabilistic
Second generation
Long. Strength
Free form deformation
Power, EEDI
Seakeeping
Maneuvering
Hull form
Naval Architecture

19. 19 © NAPA
NAPA Design Solutions
CAD export
Weight, Welding
Final booklet
Statutory Compliance Manager
Production fairing
Hull Surface Editor
3D CAD I/F
DXF, IGES, CADMATIC, Tribon
Slipway launching
Launching Manager
Class rules calc.
Data linkage
FE mesh
Data linkage
FEA assessment
Structure
Inclining test
Inclining Test Manager
Feedback to design
Operation
NAPA Steel

20. 20 © NAPA
NAPA Steel reduces FEA workload
NAPA Steel Model FE Mesh
If you have NAPA Steel model, you already have FE model

21. 21 © NAPA
NAPA FEM is auto-meshing
NAPA: Auto meshing
In many cases, minor modification and
adding boundary condition are needed
Advanced mesh editing
HyperMesh can handle huge FE
model easily and quickly
BDF

22. 22 © NAPA
FEA with NAPA & HyperWorks
Improved Pre Processing
Efficient preparation of FE model in ship design
Main Processing
Make matrix and computation
Post Processing
Decision making by designer
●
●
Boundary
Condition
Adjustment
Nodes
Elements
Ship Design
specialty
Simulation
specialty
Material

23. 23 © NAPA
Summary
FEA: Increasing importance & workload
Efficient FEA process, NAPA to HyperWorks
Unique requirement in ship design
Reduce repeating simple task, focus on DESIGN
with NAPA & HyperWorks
1
2
3

24. 24 © NAPA24 © NAPA
Appendix
Update info. Of NAPA Designer & Drafting
NAPA Shipping Solution

25. 25 © NAPA
Latest news of NAPA Designer
Redesigned NAPA modeling tool
 Windows based software redeveloped from scratch
 Latest ver.2016.2 can handle stiffener, seam, openings
NAPA Designer

26. 26 © NAPA
Latest news of NAPA Designer
Surface Object modeling
 Plate and Primary supporting member
 Compatible with traditional NAPA
Structure member modeling
 Modeling for approval drawing
 GUI based modeling
Easy modeling, easy learning
 Batch process, copy, reflect, etc...
 User can control smart naming rule

27. 27 © NAPA
Latest news of NAPA Drafting
Seamless linkage from NAPA to AutoCAD
 Powered by AUTODESK AUTOCAD® OEM
 From ver.2016.2, NAPA works with best CAD system
NAPA Drafting

28. 28 © NAPA
Latest news of NAPA Drafting
2D sliced from 3D
 3D model based 2D drawing
 2D follows 3D modification
(User can control the updating lines)
 3D model based annotations
Designed for ship designer
 X, Y, Z section and projection drawing
 Shell expansion
Save as DWG
 User can utilize the drawing data as usual AutoCAD

29. 29 © NAPA
FYR: NAPA Shipping Solutions
Loading Computer
Planning Monitoring Follow-up
Voyage Reporting Performance Analysis
NAPA Office (Web Portal)
Voyage Optimization
Departure Arrival
Real Time Monitoring

30. 30 © NAPA