rapid concept design for - friendship systems · how is a concept design made? 1. meet with client...
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Rapid Concept Design for Cargo Ships
Harry Linskens
CAESES Users Meeting
19-09-2019
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WHO ARE WE?MARITIME DESIGN & ENGINEERING COMPANY
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Concept Design: An Introduction
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What really is concept design?
Client needs
Vessel functions
Main particulars General arrangement
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What needs to be decided?
Length Draft
Beam
Cargo capacity
Displacement
Speed?Installed power?Gross tonnage?Steel weight?
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How is a concept design made?
1. Meet with client and determine needs:• Specific vessel dimensions, maximize cargo
• Specific cargo, minimize ship size
• No idea yet?
2. Determine required functionality
3. Make initial estimate of design
4. Check feasibility of design
5. Repeat 3-4 if necessary (usually, yes)
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How does this work in practice?
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Why am I sitting alone behind my desk?
• Concept design is the shortest design phase• No time to set-up team
• Limited to those who have had client contact already
• The decisions made have far-reaching implications• Main dimensions influence everything!
• Essential to make a well-considered choice
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So, what am I actually spending my time on?
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Where does CAESES come into all of this?
• Freeboard depends on hull geometry
• Stability depends on hull geometry
• Tonnage depends on hull geometry
• Speed-power depends on hull geometry
• Ice-class power depends on hull geometry
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Concept Design Workflow
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Concept Design Then…
ICE:Excel
(/NAPA?)
SPEED:Excel
(/DESP?)
HULL:Reference design
(maybe scaled? 3D?) STAB:Hand calcs(/NAPA?)
FRB:Excel
TONNAGE:Hand calcs
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Concept Design Then…
Estimate:Main dimensions
Hull shape
Check:Freeboard
Check:Tonnage
Check:Ice-class power
Check:Speed-power
Check:Stability
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…And Concept Design Now
ICE:CAESES feature
using hull geometry
SPEED:CAESES feature
using hull geometry
HULL:Parametric CAESES
geometry
STAB:Calculated using
hull geometry
FRB:CAESES feature
using hull geometry
TONNAGE:Calculated from
closed Brep
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…And Concept Design Now
Displacement
Resistance
Ice-class power
Constraint on gross tonnage
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Compared:
Traditional
• Sequential checks
• Manual iterations
• Limited number of variants
• Repetitive hand work
Integrated
• Simultaneous checks
• Automated iterations
• Large number of variants
• Press run, get coffee!
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Conclusion
• CAESES is very suitable for concept design
• Less time required to perform design feasibility checks
• More room for optimization at the very start of a design
• Better ships, quicker!
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Thank you for your attention!