Altair HTC 2012 Optistruct Training

OptiStruct WorkshopAmericas HyperWorks Technology ConferenceWarren Dias

Innovation Intelligence®

Warren Dias

May 15, 2012

Copyright © 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.

Workshop Agenda

• Optimization for Noise, Vibration and Harshness (NVH )• Model Updating / System Identification

• Optimization with Frequency Sub-Ranges

• Global Search Option

• Equivalent Static Load Method• Equivalent Static Load Method• Optimization of MBD Systems

• Optimization for Nonlinear Responses

• Composites Optimization• Zone vs. Ply Based Modeling

• Generating Design Concepts

• Ply Shape Interpretation


Altair OptiStruct

• Award-winning technology for concept design synthes is and

optimization.

• At the forefront of developing new and innovative t echniques.

• Rapidly develop lightweight, structurally efficient designs by creating • Rapidly develop lightweight, structurally efficient designs by creating

innovative concepts.

• Powerful design fine-tuning

capabilities to further improve

the design.

• Solve real world optimization

problems, efficiently!


Optimization Solutions

OptiStruct

HyperStudy

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el

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Concept Design Detailed Design


OptiStruct: An Overview

Topology

Equivalent Static Load Method

Coupled thermo-mechanical

Normal Modes

Linear Buckling

Static with Contact

Manufacturing Constraints

Shape

Parallel Processing

Direct & Iterative Solvers

AMSESAMLS Interface

Load Method

Fatigue

Frequency Response

Acoustic Response

Random Response

Design Interpretation


Workshop Agenda










NVH with HyperWorks

Model Management

Build and AssemblyFull FE, CMS, etc.Subcase Manager

…

SolutionSuper Elements

AMSESFRF

TransientTPA

PEAKOUT…

DiagnosticsPost Proc. ToolkitFluid Grid Particip.

DSA…

OptimizationModel Updating

TPL, TPG, FRSZSZ, SH, FRSHP

Internal Responses…


Optimization Problem Formulation

� Min(max)

� Min (max) with Frequency sub ranges

[ ]mjg

ffixd

j

ni

,,10)(: Subject to

,...,)(max: Minimize 0

K=≤=

x

[ ] ffixd ,...,)(max: Minimize =

� System Identification

mjg

T

Txfwwith

or

mjg

T

Txfw

j

i

iii

j

n

i i

iii

,,10)(: Subject to

)( : Minimize

,,10)(: Subject to

)(: Minimize

1

2

K

K

=≤

≤−

=≤

−∑

=

x

x

ββ

[ ]mjg

ffixd

j

subsubi

,,10)(: Subject to

,...,)(max: Minimize 21

K=≤=

x

Curve Fitting


Demonstration

• Acoustic Cavity Model

• Match a Target Curve

• Optimize Acoustic Pressure Response

• GSO


Workshop Agenda










Equivalent Static Load Method

• Dealing with dynamic problems considering true time history and not

just worst case time step

AnalysisDynamic / Nonlinear Problem

OptimizationStatic Response Problem

Load

fteq = Kdt

t

d

OptiStruct

Dynamic / Nonlinear ProblemLoad time history

Static Response ProblemEquivalent static loadsDesign variables


Demonstration 1

• Topology Optimization of the Pivot Structure

• Force on Tire Spindle

• Gravity Loading


Demonstration 2

• Analysis Type: Geometric Non-Linearity (NLGEOM)

• Material: Johnson-Cook Elastic-Plastic Material

• Problem Formulation:• Objective Function: Minimize Volume

• Design Constraints: Displacement


Workshop Agenda










Composite Zone Based Modeling

• One Property is Required for Each Laminate Zone

• Plies are not Linked across Zones

• Data Duplication, No Ply Shape

• No Relationship to the Manufacturing Process

• Design Change Requires 3 Updates

P1 45P2 90P3 -45P4 0

Zone 1 Zone 2 Zone 3 Zone 2 Zone 1

P5 -45P6 90P7 45

Zone 1 – Property Table Zone 3 – Property Table

Zone 1

Zone 1 – Property Table

Ply Mat

Thk Theta

P7 M1 0.01 45

P4 M1 0.01 0

P1 M1 0.01 45


Ply Mat

Thk Theta

P7 M1 0.01 45

P5 M1 0.01 -45

P4 M1 0.01 0

P3 M1 0.01 -45

P1 M1 0.01 45


Ply Mat

Thk Theta

P7 M1 0.01 45

P6 M1 0.01 90

P5 M1 0.01 -45

P4 M1 0.01 0

P3 M1 0.01 -45

P2 M1 0.01 90

P1 M1 0.01 45

Zone 2

Zone 3


Composite Ply Based Modeling

• A Composite Part is made up of “n” Plies and One La minate

• No Data Duplication

• Direction Relationship to the Manufacturing Process

• Ply Based Modeling Process

• Define Ply Shapes and Related Ply Data

• Define Stacking Sequences

P1 45P2 90P3 -45P4 0

P6 90P7 45

P5 -45

• Design Change Requires only 1 Update

Stack Table

Ply Mat

Thk Theta

P7 M1 0.01 45

P6 M1 0.01 90

P5 M1 0.01 -45

P4 M1 0.01 0

P3 M1 0.01 -45

P2 M1 0.01 90

P1 M1 0.01 45


Composite Optimization Process

Phase 2

Ply Shapes

Phase 1

z

Number of Plies

Ply Bundle Sizing

Laminate Stacking

Stacking Sequence Optimization

Phase 3

Rule based

ply shuffling

0

45

-45

90

45 -45 0 0

45 -45 90 90 -45 45 0 0

-45 45

Free Sizingx

y


Demonstration

• Loading Conditions• Natural frequency

• Centrifugal force due to rotational speed of 7.4 RPM

• Gravity

• Buckling

• Fluid load as determined by a coupled FSI (fluid-structure interaction) analysis

• Topology for Spars

• Free Size on Skins


Thank You for Your Attention!







