b ANSA AS A PRE-PROCESSOR FOR LS-OPT BETA OPTIMIZATION - - PowerPoint PPT Presentation

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b ANSA AS A PRE-PROCESSOR FOR LS-OPT BETA OPTIMIZATION - - PowerPoint PPT Presentation

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b ANSA AS A PRE-PROCESSOR FOR LS-OPT BETA OPTIMIZATION APPLICATIONS CAE Systems SA Georgios Korbetis DYNAmore Optimization Week - June 2 - 6, 2008 - Stuttgart, Germany Summary Problem Definition Optimization Run Morphing

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BETA

CAE Systems SA

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DYNAmore Optimization Week - June 2 - 6, 2008 - Stuttgart, Germany

ANSA AS A PRE-PROCESSOR FOR LS-OPT OPTIMIZATION APPLICATIONS Georgios Korbetis

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Summary

 Problem Definition  Optimization Run  Morphing Capabilities  Conclusions

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Problem definition Defining the model for the solver

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Problem definition Objective function Constraints Design Variables

Hole Diameter Slope Slope Depth Thickness

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Problem definition Creating Morphing Boxes

Symmetry Link Boxes Original Boxes

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Problem definition Defining Morphing Parameters

depth_middle depth_side slope

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Problem definition Defining Morphing Parameters

depth_middle depth_side

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Problem definition Connecting Design Variables with user scripts

 Open holes in FE-Model  Specify meshing parameters for the holes

hole_diameter

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Problem definition Connecting Design Variables with user scripts

 Open holes in FE-Model  Specify meshing parameters for the holes

  • ne zone of elements
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Problem definition Defining thickness as ANSA Parameter

shell_thickness ANSA Parameter Design Variable

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Problem definition Defining Task Manager sequence

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Problem definition Connecting Design Variables with Morphing Parameters

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Problem definition Connecting Design Variables with ANSA parameters

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Problem definition Connecting user scripts to Design Variables

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Problem definition Checking Model Validity

6 1.2 12 2.4 18 3.6 24 4.8 30 6.0

failed elements

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Problem definition Improve model quality using scripts and session commands

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Problem definition Output Design Variables

$ DESIGN VARIABLES $--------------------------------------------------------------------------------------- $ ID | DESIGN VARIABLE NAME | TYPE | RANGE | CURRENT VALUE | MIN VALUE --> MAX VALUE | STEP $--------------------------------------------------------------------------------------- 1 DEPTH REAL BOUNDS 10. 0. 50. 2 SLOPE REAL BOUNDS 10. 0. 10. 3 HOLES DIAMETER REAL BOUNDS 0. 0. 20. 4 THICKNESS REAL LIST 1. 1. 1.2 1.4 $--------------------------------------------------------------------------------------

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Problem definition Connect ANSA to LS-OPT

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Problem definition Connect ANSA to LS-OPT

$ DESIGN VARIABLES $--------------------------------------------------------------------------------------- $ ID | DESIGN VARIABLE NAME | TYPE | RANGE | CURRENT VALUE | MIN VALUE --> MAX VALUE | STEP $--------------------------------------------------------------------------------------- 1 DEPTH REAL BOUNDS 10. 0. 50. 2 SLOPE REAL BOUNDS 10. 0. 10. 3 HOLES DIAMETER REAL BOUNDS 0. 0. 20. 4 THICKNESS REAL LIST 1. 1. 1.2 1.4 $--------------------------------------------------------------------------------------

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DYNAmore Optimization Week - June 2 - 6, 2008 - Stuttgart, Germany $ DESIGN VARIABLES $--------------------------------------------------------------------------------------- $ ID | DESIGN VARIABLE NAME | TYPE | RANGE | CURRENT VALUE | MIN VALUE --> MAX VALUE | STEP $--------------------------------------------------------------------------------------- 1 DEPTH REAL BOUNDS <<DEPTH>> 0. 50. 2 SLOPE REAL BOUNDS <<SLOPE>> 0. 10. 3 HOLES DIAMETER REAL BOUNDS <<HOLES_DIAMETER>> 0. 20. 4 THICKNESS REAL LIST <<THICKNESS>> 1. 1.2 1.4 $--------------------------------------------------------------------------------------

Optimization Run

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ANSA

Design Variables

Modifying Design Variables

depth

LS-DYNA LS-OPT Responses LS-OPT

Objective Parameters

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Optimization Run

ANSA

Design Variables

subframe.key model_report.txt

Runs the task manager sequence Output LSDYNA file and model report

LS-DYNA LS-OPT Responses LS-OPT

Objective Parameters

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Optimization Run LS-DYNA

ANSA

Design Variables

subframe.key LSDYNA

  • utput files

Invoke solver

LS-DYNA LS-OPT Responses LS-OPT

Objective Parameters

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Optimization Run

ANSA

Design Variables

Extract responses using LS-OPT functionality

Max_stress.txt

LS-DYNA

  • utput files

LS-DYNA LS-OPT Responses LS-OPT

Objective Parameters

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Optimization Run

ANSA

Design Variables

Calculate objective function and constraints

LS-DYNA LS-OPT Responses LS-OPT

Objective Parameters

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Optimization Run

ANSA

Design Variables

The optimization algorithm calculates new values for the design variables

Optimal solution

The process is repeated until the optimal solution is found

LS-DYNA LS-OPT LS-OPT Responses

Objective Parameters

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Morphing Capabilities Direct Morphing

 Apply different algorithms of morphing  Define complicated shapes from basic geometry

cubic p=0 cubic p=0.66 cubic p=1 linear

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Morphing Capabilities Direct Morphing

 Apply different algorithms of morphing  Define complicated shapes from basic geometry

cubic (p=0) cubic (p=1) linear + +

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Morphing Capabilities Deformation Morphing Parameter

 Combining many morphing processes in one Parameter  Connect any morphing application to Task Manager

Manual Morphing Direct Morphing Morphing Parameters Edge fitting Deformation Parameter Deformed shape Initial shape

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Morphing Capabilities Deformation Morphing Parameter

 Combining many morphing processes in one Parameter  Connect any morphing application to Task Manager

Parameter value = 0 0.2 0.4 0.6 0.8 1.0 Initial shape Deformed shape

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Creating Features

Length Width Depth

 Creating simple features like ribs and beads using Direct Morphing  Modifying feature dimensions with Morphing Parameters

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Creating Features

 Creating simple features like ribs and beads using Direct Morphing  Modifying feature dimensions with Morphing Parameters

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Edge Fitting

 Fitting FE-Model on different shapes using target curves  Handling the shaping with Morphing Parameters

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Edge Fitting

slide 33  Fitting FE-Model on different shapes using target curves  Handling the shaping with Morphing Parameters

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Spotweld Distance: 50mm Spotweld Distance: 30mm Spotweld Diameter: 6mm Spotweld Diameter: 4mm

Spotweld Optimization Spotweld optimization is possible through ANSA functionality As Design Variables can be set Connection parameters:

 Spotweld distance  Number of spotwelds  Spotweld diameter

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Type: RBE3-HEXA-RBE3 Type: NASTRAN CWELD

Spotweld Optimization Spotweld optimization is possible through ANSA functionality As Design Variables can be set :

 Connection properties and materials  Application of different types of spotwelds to the Connections

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Batch Mesh and Optimization

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The batch mesh parameters and quality criteria can be used as Design Variables in the optimization loop Such Variables can be:

 Element length  Treatment of holes and fillets

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Composite Material Optimization

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Using the ANSA Laminate Tool for composite optimization

 Changing fabric orientation  Changing layer thickness

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METAPost for optimization METAPost can provide a fast and easy way to extract constraints and objective parameters from solvers result files

Support of binary or ascii result files

 Calculations to extract the desired results

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Conclusions

 The set up of shape and property optimization for LSOPT is possible in the

ANSA pre-processor

 The Morphing Tool provides a powerful functionality for shaping FE model which

is the key for the shape optimization

 The pre-processing of the optimization problem can be automated by the Task

Manager

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THANK YOU

THANK YOU