Altair HTC 2012 Optistruct Training

OptiStruct Workshop
Americas HyperWorks Technology Conference
Warren Dias
Innovation Intelligence® 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
• 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 synthesis and
optimization.

• At the forefront of developing new and innovative techniques.

• 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

HyperStudy
OptiStruct
Component Level
System Level

Concept Design Detailed Design


OptiStruct: An Overview

Static with Coupled thermo-
Contact mechanical
Topology
Manufacturing
Normal Modes
Constraints

Equivalent Static
Linear Buckling
Load Method

Frequency AMSES
Response AMLS Interface

Acoustic Direct & Iterative
Response Solvers

Random Design
Response Shape Interpretation

Parallel
Fatigue
Processing


NVH with HyperWorks

Solution
Model Super Elements Optimization
Diagnostics
Management AMSES
Post Proc. Toolkit
Model Updating
Build and Assembly FRF TPL, TPG, FRSZ
Fluid Grid Particip.
Full FE, CMS, etc. Transient SZ, SH, FRSHP
DSA
Subcase Manager TPA Internal Responses
…
… PEAKOUT …
…


Optimization Problem Formulation

Min(max)
Minimize : max[d i ( x)] i = f 0 ,..., f n
Subject to : g j ( x) ≤ 0 j = 1,K, m

Min (max) with Frequency sub
ranges

Minimize : max[d i ( x )] i = f sub1 ,..., f sub 2
Subject to : g j ( x) ≤ 0 j = 1,K, m

System Identification
2
n
 f ( x) − T 
Minimize : ∑  wi i T i 

i =1 

i 
Subject to : g j ( x) ≤ 0 j = 1,K , m

or
f i ( x) − Ti
Minimize : β with wi ≤β
Ti
Subject to : g j ( x) ≤ 0 j = 1,K , m
Curve Fitting


Demonstration

• Acoustic Cavity Model
• Match a Target Curve
• Optimize Acoustic Pressure Response
• GSO


Equivalent Static Load Method

• Dealing with dynamic problems considering true time history and not
just worst case time step

Analysis Load Optimization
Dynamic / Nonlinear Problem Static Response Problem
Load time history Design variables Equivalent static loads

OptiStruct

d
fteq = Kdt

t


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


Composite Zone Based Modeling

• One Property is Required for Each Laminate Zone
Zone 1 Zone 2 Zone 3 Zone 2 Zone 1

• Plies are not Linked across Zones P1
P2
45
90
P3 -45
• Data Duplication, No Ply Shape P4 0
P5 -45
• No Relationship to the Manufacturing Process P6 90
P7 45

• Design Change Requires 3 Updates Zone 1

Zone 1 – Property Table Zone 3 – Property Table
Ply Ma Thk Theta Ply Ma Thk Theta Zone 2
t t
P7 M1 0.01 45 P7 M1 0.01 45
Zone 3
P4 M1 0.01 0 P6 M1 0.01 90
P1 M1 0.01 45 P5 M1 0.01 -45
P4 M1 0.01 0
Zone 2 – Property Table
P3 M1 0.01 -45
Ply Ma Thk Theta
t P2 M1 0.01 90
P7 M1 0.01 45 P1 M1 0.01 45
P5 M1 0.01 -45
P4 M1 0.01 0
P3 M1 0.01 -45
P1 M1 0.01 45


Composite Ply Based Modeling

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

• No Data Duplication
P1 45
• Direction Relationship to the Manufacturing Process P2 90
P3 -45
P4 0
• Ply Based Modeling Process P5 -45
P6 90
• Define Ply Shapes and Related Ply Data P7 45

• Define Stacking Sequences

• Design Change Requires only 1 Update

Stack Table
Ply Ma Thk Theta
t
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 1

Ply Shapes
Phase 2 z
Number of Plies
y

x Free Sizing Phase 3
Laminate Stacking
45
0 -45
0
Ply Bundle Sizing Rule based 0
45
45 -45
90
90
-45
-45 45
0
ply shuffling 0
-45
90
45

Stacking Sequence Optimization


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!

• Optimization for Noise, Vibration and Harshness (NVH)
• Model Updating / System Identification
• Optimization with Frequency Sub-Ranges
• Global Search Option

• 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 HTC 2012 Optistruct Training

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