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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
Copyright © 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
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!
Copyright © 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
Optimization Solutions
OptiStruct
HyperStudy
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Lev
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Concept Design Detailed Design
Copyright © 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
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
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
Copyright © 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
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…
Copyright © 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
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
Copyright © 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
Demonstration
• Acoustic Cavity Model
• Match a Target Curve
• Optimize Acoustic Pressure Response
• GSO
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
Copyright © 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
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
Copyright © 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
Demonstration 1
• Topology Optimization of the Pivot Structure
• Force on Tire Spindle
• Gravity Loading
Copyright © 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
Demonstration 2
• Analysis Type: Geometric Non-Linearity (NLGEOM)
• Material: Johnson-Cook Elastic-Plastic Material
• Problem Formulation:• Objective Function: Minimize Volume
• Design Constraints: Displacement
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
Copyright © 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
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
Zone 2 – Property Table
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
Zone 3 – Property 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
Zone 2
Zone 3
Copyright © 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
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
Copyright © 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
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
Copyright © 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
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
Copyright © 2012 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
Thank You for Your Attention!
• 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