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11. LS-DYNA Forum, 9.-10. October 2012, Ulm
Advantage of LS-DYNA in the convertible top development
Matthias Rupp, in2p GmbH
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Use of CAD and simulation tools for virtual concept validation of convertible tops and saving prototypes.
Target
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• Presentation in2p GmbH
• Motivation
• History of virtual product development
• Process: convertible top development
• Textile simulation
Content
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Presentation in2p GmbH
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body in white
concepts and
workshops
other industries
opening roof systems
Development priorities of in2p GmbH
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Motivation
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Corny Littmann, former president of FC St. Pauli football club:
„To find security in the insecurity - that encourages creativity.”
source: NDR Talkshow
Be honest: In the complex system of a roof system remains always a pinch of uncertainty in
the concept development...
... which allows us to be creative.
Motivation
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History of virtual product development
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History
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History
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History
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History
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Process:convertible top development
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time
maturity
Physical Mock
Up
Styling &
Specifications
Release
Package
Kinematics
Forces
3D Model
FEM
functional integration
functional integration
geometrical integration
Development steps to safe virtual prototypes
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dimensional concept
R points
Package
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skeleton method stroke kinematics
Template linkage
Template four-bar
Design of a kinematic
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Template stratification
Skeleton method
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Functional integration with CATIA V5
Presentation of results by Adams PostProzessor
Results:
- Forces
- Moments
- Accelerations
- required driving forces
and moments
under influence of :
- Component masses
- Gravitation
- Friction
Forces calculation with SimDesigner Enterprise
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surface modeling solid modeling
• parametric - associative design
• interface optimized working
• integration of templates
3D modeling with CATIA V5
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tensions & deformations
FEM CATIA V5 GPS GSA
Finite Elemente Method - Calculation
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Simulation of textile behavior
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time
maturity
Physical Mock
Up
Styling &
Specifications
Release
Package
Kinematics
Forces
3D Model
FEM
functional integration
functional integration
geometrical integration
Development steps to safe virtual prototypes
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Textile simulation
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Textile simulation at in2p – tests
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3D data from CATIA
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3D data from CATIA – meshed with ANSA
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simulation of convertible softtop with LS-DYNA
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without preload
with preload
Consideration of textile preload
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without preload with preload
Tracecurve of fixing pin
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Tracecurves
9,25E+02
9,75E+02
1,03E+03
1,08E+03
1,13E+03
1,31E+03 1,33E+03 1,35E+03 1,37E+03 1,39E+03 1,41E+03 1,43E+03 1,45E+03
X-Werte
Z-W
erte ohne Stoffvorspannung
mit Stoffvorspannung
3,9 kN
3,1 kN
Tracecurve of fixing pin in conjunction with cylinder force
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Strains in the top material
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Strains in the top material
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Strains in the top material
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AB
C
Forces in the top material
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Tensions in convertible roof frame and bearing forces
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0Y
-400Y
-600Y
0Y
-400Y
-600Y
Sections of the convertible top in storage position
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photo prototype result simulation
Comparison theory – practice
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The following points can be tested or derived by help of textile simulation:
- fabric lengths
- tension / strain
- fabric connections
- frame elasticities
- intake curves
- closing forces
- seam curves
- dimensioning ropes
- influence of the rear window
- narrow points in the storage
- straps
- pads
� The developers is given a safe statement to functionality of their roof concepts - even
before the first functional prototype is built.
Summary - benefits for the developer
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Thank you for your attention.
