Mode Frontier

Introductory Training on modeFRONTIER

3/14/2009

Introductory Course on modeFRONTIER 1

Crashworthiness Optimization using modeFRONTIER and LS-DYNA

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modeFRONTIER and LS DYNAESTECO North America

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.

Problem Description

•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

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– 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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Setting up a Workflow

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Input Variables

Insert 5 Input Variables

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Input Variables

We can customize

view of selected icons

h

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here

Input Variables

We can change Input Variable

Definitions (Limit Values, Discretization,

etc ) here

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etc.) here


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Input File for LS-DYNA Analysis

Insert input file node

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Link the input variables to the input file

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Open Input file node and Edit input file

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Open Input File Template

Select template input file

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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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Icon into Workflow


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Add LS-DYNA Analysis Node

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Connect “Dyna_main_file” node and “Support file”

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ppnode to “Run_LSDYNA” node

through data input portOpen “Run_LSDYNA” node by double click


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Type in command line to run LS_DYNA

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Data Processing and Transfer File Nodes

Add “Data_processing” node and link to

“Run_LSDYNA” node

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Add transfer file node to transfer data from “ls-dyna

analysis” to “Data processing”


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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.

Open the transfer file node by double click


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Type in transfer file name and click “ok”

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Support File Node for Data Processing

Add support file for “Data_processing” node

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Link support file node ppto “Data_processing”

node

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Data Processing Node

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Edit “Data_processing” node by doulbe clicking


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Script to run LS_prepostscript file to process data and create output files

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Output File Node

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Output File Node

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Output Variable Node

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Output Variable Introspect

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Double clicking “output file” node


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Change the output file name

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Left clicking to highlight the

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Left clicking to highlight the output variable


Right click and select “Absolute Position”

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Output File and Output Variable Node

R t th

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Repeat the process to add another output

variable


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Output File and Output Variable Node

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DOE and Optimization node

Define the Scheduler

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DOE

Double-click DOE

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click DOE node

DOE

Choose “Soble”, “Number of

designs” to 20, d th “Add DOE

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and the “Add DOE Sequence”


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Optimization node

Double-click Scheduler 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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Workflow

Reposition labels to bottom

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“End of Logic” Node

Add the “End f L i ” N dof Logic” Node

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Double-click the Double-click the “Data_processing

” node again

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Change the Exit value to “-1”, which implies LS_prepost run

successfully

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Logic Log

Clicking on the “Logic Log” tab

shows us that we are still missing

Objectives

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Objectives

Choose Objective

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Objective icon, and place in

Workflow


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Objectives

Link the

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objective node to output variable

“intrusion” node

Objectives

Double-click Objective Icon on screen, which will

Enter a name for the objective, then choose what is to be

maximized or minimized using ,

open Objective Dialog Box

minimized, using the calculator

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ObjectivesThe calculator can be used to build

an objective function; here we

just want to jminimize

“intrusion”

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Objectives

Set Type to “Minimize”

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Objectives

Another objective

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jcan be defined in a similar manner to minimize HIC15

Run Design Optimization

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Run

W kfl i

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Workflow is now complete (no warnings in Logic Log), hence “Run” button becomes active

Run

Click “Run”

Specify a file name for mF project

Click “Run Project”

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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 which allow the user to

see more of the progress of an individual design

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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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Design Space: Scatter Chart

Choose the Scatter Chart Icon

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Design Space: Scatter Chart

Select the two objectives to be j

displayed

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Scatter Chart

Create a scatter chart of “intrusion” against Create a scatter chart of 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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Design Space: Parallel Chart

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A Parallel Chart shows all designs, and can be used

to filter

Design Space: Parallel Chart Sliding the “intrusion” filter down, leaves

only the designs with low values of intrusion

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Design Space: Parallel Chart

Note: Both “intrusion” and “HIC15” to be

minimized, therefore the crossover of the lines is i di ti f t d ff

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indicative of a trade-off

Design Space: Scatter Matrix

Use the “Scatter Use the Scatter Matrix” to show the correlation between inputs and outputs

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Use “Ctrl” to select all inputs and two outputs click “OK”and two outputs, click OK

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Mode Frontier