high performance catamaran design & optimisation with hyperworks
TRANSCRIPT
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High Performance Catamaran Design
& Optimisation with Hyperworks
Julien ChausseeTeam Rafale - ETS
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Team Rafale - ETS
Design & Build team
• 7 Masters Students• 15 Bachelor Students
• 1 professor : Simon Joncas• 1 aerospace Engineer : Julien Chaussée,
former member of the Invictus British team
L’équipe de navigation
Former Members of the Canadian 49er team:
• Marc Farmer helm• Tej Trevor Parekh crew•
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The Challenge
Design and Build a 25ft C-Class Catamaran to compete in the Little Cup in Geneva in 2015
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C-Class Catamarans
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Vidéo de présentation
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C-Class catamarans are sailed double-handed
7
25ft
14ft
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• Sail Area:
– 300 ft2 maximum
– No restriction on number of sails or design
• Crew:
– 2 crew
– 2 trapeze
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PERFORMANCE
• Very fast boat
• Very light boat
• Rigid Wingsail:
• better power to drag ratio
• Less stay tension = less weight!
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Hellcat (70’s)
450kg
17kts (35km/hr)
Soft sails
Aluminium mast and beams
Wooden hulls
190kg
20kts (37km/h)
All Composites construction
Rigid Wingsail
Still only displacement boat
Cogito (1996) Groupama C (2013)
170kg
35kts (65km/h)
Carbon Thin Ply Technology
Hydrofoils
C-Class History and Evolutions
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Équipe ETNZ AC72
C-Class are a real Innovation laboratory for sailing!!!
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1988 America’s Cup
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Rafale C-Class – Design Overview
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Rafale C-Class• Modern C-Class Design
• Platform:
• Low buoyancy / low profile hull
• Full Carbon fiber sandwich constructions
• Hydrofoil:
• 2 main lifting board (1 in the water at a time)
• J-shape / “UpTip ” concept
• 2 T-foil rudders to stabilise the boat
• Wing:
• High Aspect Ratio
• Carbon and glass fiber structure
• 2 element concept
• Morphing trailing edge (front element)
• All up weight target: 400lbs
45ft
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General Arrangement
Overlay of Hydros boat (Swiss team)
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Case Study 1: Hydrofoil Optimisation
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Hydrofoils – Why Fly?
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Hydrofoils – Why Fly?
Source: Andy Kensington – ETNZ, “Battle of the Boat” presentation, IPENZ Lecture 2014
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Hydrofoil design brief
• Concept: J-Foil or “UpTip” shape
• Target Lift = Weight of Boat + Crew (~800lbf)
• Maximum Deflection: 90mm ` 100mm
• Single piece foil
• No metallic inserts
• Carbon Fiber skins + Foam core inside
• Target Weight: 12kg / 26lbs
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Design ApproachUse of Hyperworks Composite Optimisation Process
Composite Free-Size
Free-Size Review and Refinement
Optimisation Perfromed by Francois Michaud
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Initial Model & Setup
• Shell model with Solid core inside
2m
0.7m
R = 0.25m
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Initial Model & Setup
Load Cases Constraint Value
Partially Submerged Foil 320 kgMax Deflection (at
elbow)90 mm
Foil fully submerged 550 kg
Failure Criteria
(Tsai-Wu)FSmin = 1.5
No Buckling λmin= 3
• Shell model with Solid core inside• Loads generated from CFD spatial pressure
distribution (see load cases below)• Carbon fiber UD properties• 0 / +45 / -45 / 90• Core material not included in the
optimisation• +45 and -45 plies linked• Minimum 5% plies in each direction
Vertical Constraint
Water level (fully submerged)
Water level Mini
HorizontalConstraint
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Initial Results and Zone Definition
Upper Skin
Lower Skin After clean up of plies / zones
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Results after Shuffling
Note:
• Laminate is symmetrical
• +45/-45 UD switched for woven in the end
• Added a 0/90 on OML (request
from our Partner Mystere Composites for ease of manufacture)
• Final Design Weight 11kg
ZONE ID
PLY ID 1 2 3 4 5 6
1 0°/90° 0°/90° 0°/90° 0°/90° 0°/90° 0°/90°
2 ±45° ±45° ±45° ±45° ±45° ±45°
3 0° 0° 0° 0° 0° 0°
4 0° 0° 0° 0°
5 ±45° ±45° ±45° ±45° ±45° ±45°
6 0° 0° 0° 0° 0°
7 0° 0° 0° 0° 0°
8 ±45° ±45° ±45°
9 0° 0°
10 0° 0°
11 ±45° ±45° ±45°
12 0° 0° 0° 0° 0°
13 0° 0° 0° 0° 0°
14 ±45° ±45° ±45° ±45° ±45° ±45°
15 0° 0° 0° 0°
16 0° 0° 0° 0° 0° 0°
17 ±45° ±45° ±45° ±45° ±45° ±45°
18 0°/90° 0°/90° 0°/90° 0°/90° 0°/90° 0°/90°
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Ply Design Generation
• Initial ply shapes extracted from model with Hypermesh functionalities
• Exported to CATIA Composites Workbench for final design and ply flattening
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… a few month later
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Other Use of Hyperworks
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Analysis and Optimisation
• Full FEM of the plateform:– Sizing
– Stiffness analysis
• Rudder / foil analysis
• Main beam composites optimisation
• Mast Analysis and sizing
• Small components detailed Analysis
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Conclusion
Thanks to
And Hyperworks:
• Significant time saving• And all targets achieved
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A big Thank You to Our Sponsors and Partners
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