finite element modeling and testing of aerospace seats...
TRANSCRIPT
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Finite Element Modeling and Testing of
Aerospace Seats Under Crash Conditions
2012 Americas HyperWorks Technology Conference
Fady Barsoum Ph.D
Benjamin Walke (presenting)
Aditya Gupte
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Talking Points
Motivation
Simulation Standards
Process Flowchart
Key Functions
Results
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Motivation
Step-by-Step modeling method for effective
crash simulation
Save time required to simulate a high-g crash
in conjunction with testing
Allow for simulation of design changes to
improve safety
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Aircraft Seats
Gulfstream
aircraft seats
Pilot &
Passenger
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Simulation Standards
Simplify the structure
and crash conditions with
the aim of a basic model
Cushions removed
2-point buckle
Head on crash
16G in 90ms
170 lb Dummy
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Simulations Standards
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Flowchart CAD
Pre-Processing Explicit Dynamic
*Defeaturing *Mesh *BC *Prescribed Motion
Solver
Post-Processing
HyperMesh HyperCrash
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LS-DYNA
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Geometry
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Geometry
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2D Geometry Integration
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Initial Mid-Surface
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Pre-Procesing in HyperMesh
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Hole Removal
Fillet and Round Defeaturing
Automatic MidSurface
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Mesh
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HyperCrash
Contact Modeling
Dummy and Seat
Belt and Dummy
Seat Components
Boundary Conditions
Prescribed Motion
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Contact Modeling
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Tied Surface to Surface
Tied Shell Edge to Surface
Automatic Surface to Surface
Automatic Nodes to Surface
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Boundary Conditions
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Boundary Conditions set to allow only for translational motion in the aft facing direction
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-17
-15
-13
-11
-9
-7
-5
-3
-1
0 50 100 150 200
G
Time (milliseconds)
Sled Acceleration
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Post-Processing
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0 ms 100 ms 50 ms
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Testing
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Future Analysis and Testing
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Conclusion
Functions in HyperMesh and HyperCrash
greatly reduced our time to pre-process.
We are close to the validation of simulation
data with test data, however more work must
be done.
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References
Bala, Suri. Jim Daly. “General Guidelines for Crash Analysis in LS-
DYNA”
Bhonge, Prasannakumar. “A Methodology for Aircraft Seat Certification
By Dynamic Finite Element Analysis.”
“Getting Started with LS-DYNA.” (LSTC)
LS-DYNA Keyword User’s Manual (LSTC)
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