Development of Computational Model of Sport Utility Vehicle Srdan Simunovic, Gustavo Aramayo and...
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![Page 1: Development of Computational Model of Sport Utility Vehicle Srdan Simunovic, Gustavo Aramayo and Thomas Zacharia Computer Science and Mathematics Division.](https://reader035.fdocuments.in/reader035/viewer/2022062619/5517ea26550346c1568b48cb/html5/thumbnails/1.jpg)
Development of Computational Model of Sport Utility Vehicle
Srdan Simunovic, Gustavo Aramayo and Thomas Zacharia
Computer Science and Mathematics Division
Oak Ridge National Laboratory
NHHTSA Project Review, October 20 1998
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http://www-explorer.ornl.gov
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Outline
• Status
• Modeling Approach
• Available Models
• Things to Finalize
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Status
• Developed parametric finite element model of 1998 Ford Explorer XLT 4x2
• Tested models– full frontal impact
– frontal offset impact
– frontal offset oblique impact
• Developed WWW-based model manipulation– WWW based model generation available 12/98
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Related Parametric FEM Projects at ORNL
• Aluminum Intensive Vehicle Model Development
• Ultra Light Steel Auto Body
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Aluminum Intensive Vehicle
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ULSAB
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Fixed FEM Mesh Model
• Initial FEM model was based on “dirty” geometry– scanned geometry was not extensively modified
– regularity and connectivity of FEM mesh was enforced by direct placement of nodes on surfaces and by single FEM mesh realization
• Model has varying degree of FEM mesh regularity and quality– frame - high
– body - low
• Model was tested in frontal and frontal-offset impact
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Fixed FEM Model Features
• 25k Nodes, 25k Elements
• Relatively good results– good deformation, crash duration, acceleration– mainly due to importance of frame in impact
response
• Model modifications not practical– regularity enforced by numerous ad-hoc
constraints
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Parametric FEM Model
• Objective– More FEM meshes in less time
• Methodology developed can be easily applied to other FEM models
• Want to learn more on vehicle impact simulations
• Have not been done yet for such complex models
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Advantages of Parametric Model
• Rapid generation of crash situation-specific models
• Simple model modification through parameter modification
• Allows for investigation of convergence of simulation results
• Becomes possible to determine “the best” model for specific impact scenario
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Disadvantages of Parametric Modeling Approach
• Longer initial model development time
• Geometry needs to be “clean”
• Software not yet available for entire process
• Manipulation of large number of parameters is cumbersome, therefore, model modification is usually limited to initial developers
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Coarse FEM Mesh
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Frontal Impact Model
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Rear Impact
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Frontal Impact
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FEM Mesh Parametrization
• Clean up geometry– connections between CAD surfaces must be accurate
– CAD surfaces must be reorganized to fit FEM model
• Pick up general mesh topology• For each part develop FEM mesh projection approach• Determine topology constrains enforced by
neighboring parts• Create FEM mesh through projections on CAD
surfaces
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FEM Mesh Parametrization
• Enforce FEM mesh connectivity through part boundaries by mesh topology constraints
• Make FEM mesh projections using CAD entities, not coordinates
• Make things as you go– CAD, FEM mesh, mesh generator scripts, parsers,
CAD-to-FEM-to-CAD, visualization
• Debug!
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Basic FEM Model
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Coarse FEM Mesh
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Basic Model - Results
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Frontal Impact Model
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Frontal Impact - Results
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Model Modifications
• Immediate fixes– Engine mounts damping effect– Elevate frame– Reconnect left body mount– Break-off conditions for bumper
• Users can specify needed modifications as they run simulations
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Offset Impact Model
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Offset Impact - Results
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Pole Impact Results
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Rear Impact
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Detailed FEM Mesh in the Back
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Rear Impact
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Frontal Impact
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Side ImpactModel
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Detailed FEM Mesh on the Side
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WWW Model Interface
• Large number of mesh control parameters in basic model (> 200)– very flexible FEM mesh topology– direct parameter manipulation intractable to
anyone other than model developers
• Model modification can be facilitated through VRML interface
• User access through API-like process
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To Do - FEM Model Related
• Frame modifications– engine placement and mounts– transmission placement and mounts– drive axle placement– raise frame
• Body modifications– close few minor gaps
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To Do - Parametric FEM Related
• Mesh topology– parameter placement evaluations (need suggestions)– parameter propagation tests
• Verify with NHTSA tests• WWW interface for FEM model
– parameter propagation display (needs speed fix)– connection between parts– subpart display– parameter display and user input (speed fix)– set up server for remote mesh generation (Unix, Win/NT)– develop annotation procedure (primitives developed)
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Deliverables
• Current LS DYNA3D models available on WWW– www-explorer.ornl.gov
• Next model release in early December 1998– we can generate specific models in the meantime if
needed, please help us to debug!
– Full verification with NHTSA tests
– materials property update as becomes available
• WWW interface for model inspection– new releases available daily