Introductory Training on modeFRONTIER
3/14/2009
Crashworthiness Optimization using modeFRONTIER and LS LS-DYNA DYNA ESTECO North America
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Problem Description The problem is of a simplified vehicle moving at a constant velocity and crashing into a rigid pole. The figures left show the parts and the deformed vehicle after 50ms. •Design parameters – Thickness of hood, bumper, grill, floor, and body, all have range 1 to 5 cm, with step size 0.1 cm •Analysis and data processing tools – LS-DYNA 970 – LS-PREPOST 3.0 •Objectives – Minimize HIC(15ms) of node 432 – Minimize intrusion, which is defined as the relative displacement between nodes 167 and 432 •Constraint – Intrusion(50ms) < 550mm
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
Setting up a Workflow
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Input Variables
Insert 5 Input Variables
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
Input Variables
We can customize view of selected icons h here
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Input Variables
We can change Input Variable Definitions (Limit Values, Discretization, etc ) here etc.)
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Input File for LS-DYNA Analysis
Insert input file node
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Input File for LS-DYNA Analysis
Link the input variables to the input file
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
Input File for LS-DYNA Analysis
Open Input file node and Edit input file
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Open Input File Template
Select template input file
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Input Variable Introspect
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Add Support File for LS-DYNA Analysis
Add Support File Icon into Workflow
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
Add Support File for LS-DYNA Analysis
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Add Support File for LS-DYNA Analysis
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Add Support File for LS-DYNA Analysis
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Add LS-DYNA Analysis Node
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Add LS-DYNA Analysis Node
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Add LS-DYNA Analysis Node
Open “Run_LSDYNA” node by double click
Connect “Dyna_main_file” node and “Support pp file” node to “Run_LSDYNA” node through data input port
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Add LS-DYNA Analysis Node
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Add LS-DYNA Analysis Node
Type in command line to run LS_DYNA
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
Add LS-DYNA Analysis Node
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Add LS-DYNA Analysis Node
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
Data Processing and Transfer File Nodes
Add “Data_processing” node and link to “Run_LSDYNA” node
Add transfer file node to transfer data from “ls-dyna analysis” to “Data processing”
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Data Processing and Transfer File Nodes
Open the transfer file node by double click
Rename the transfer file node as “nodout”, link the node to data output connector of “Run_LSDYNA” node and data input connector of “Data_processing” node, respectively.
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Data Processing and Transfer File Nodes
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Data Processing and Transfer File Nodes
Type in transfer file name and click “ok”
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
Data Processing and Transfer File Nodes
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Support File Node for Data Processing
Add support file for “Data_processing” node
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
Support File Node for Data Processing
Link support pp file node to “Data_processing” node
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Support File Node for Data Processing
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Support File Node for Data Processing
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Data Processing Node
Edit “Data_processing” node by doulbe clicking
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Data Processing Node
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Data Processing Node
Script to run LS_prepost script file to process data and create output files
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Output File Node
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Output File Node
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Output Variable Node
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Output Variable Introspect
Double clicking “output file” node
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
Output Variable Introspect
Change the output file name
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Output Variable Introspect
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Output Variable Introspect
Left clicking to highlight the output variable
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Output Variable Introspect
Right click and select “Absolute Position”
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Output Variable Introspect
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Output File and Output Variable Node
R Repeat t th the process to add another output variable
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
Output File and Output Variable Node
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DOE and Optimization node
Define the Scheduler
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
DOE
Doubleclick DOE node
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DOE
Choose “Soble”, “Number of designs” to 20, and d the th “Add DOE Sequence”
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
Optimization node
Double-click Scheduler (Algorithm) node
Optimization node Choose “MOGA-II”, set “Number of generations” to “20”,, “Number of concurrent design evaluations” to “2”, and click “OK”
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Workflow
Reposition labels to bottom
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“End of Logic” Node
Add the “End off Logic” L i ”N Node d
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
“End of Logic” Node
Double-click the “Data_processing ” node again
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“End of Logic” Node
Change the Exit value to “-1”, which implies LS_prepost run successfully
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
Logic Log
Clicking on the “Logic Log” tab shows us that we are still missing Objectives
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Objectives
Choose Objective icon, and place in Workflow
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Objectives
Link the objective node to output variable “intrusion” node
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Objectives Double-click Objective Icon on screen,, which will open Objective Dialog Box
Enter a name for the objective, then choose what is to be maximized or minimized using minimized, the calculator
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Objectives The calculator can be used to build an objective function; here we jjust want to minimize “intrusion”
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Objectives
Set Type to “Minimize”
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Objectives
Another objective j can be defined in a similar manner to minimize HIC15
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Run Design Optimization
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Run
W kfl Workflow iis now complete (no warnings in Logic Log), hence “Run” button becomes active
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Run Click “Run”
Specify a file name for mF project Click “Run Project”
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Run Logs
Click “Design Group” “00000-00999”
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Run Logs
These are hyperlinks, which allow the user to see more of the progress of an individual design
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Design Space: Results Table
Switch to “Design Space” and display the results in Tabular Form
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Post-processing
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
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Design Space: Scatter Chart
Choose the Scatter Chart Icon
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Design Space: Scatter Chart
Select the two objectives j to be displayed
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
Scatter Chart
Create a scatter chart of “intrusion” intrusion against “HIC15”. We can mark the Pareto Designs by right-click on the chart background, and then “Mark Designs” -> “Mark Pareto Designs”
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Pareto Designs as Marked
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
Design Space: Parallel Chart
A Parallel Chart shows all designs, and can be used to filter
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Design Space: Parallel Chart
Sliding the “intrusion” filter down, leaves only the designs with low values of intrusion
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
Design Space: Parallel Chart
Note: Both “intrusion” and “HIC15” to be minimized, therefore the crossover of the lines is i di ti off a ttrade-off indicative d ff
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Design Space: Scatter Matrix
Use the “Scatter Scatter Matrix” to show the correlation between inputs and outputs
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Introductory Course on modeFRONTIER
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Introductory Training on modeFRONTIER
3/14/2009
Design Space: Scatter Matrix
Use “Ctrl” to select all inputs and two outputs, outputs click “OK” OK
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Design Space: Scatter Matrix
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