INSTRUCCIONS FOR OPTIMIZATION

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Copyright 2010 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.

Instructional Material on Structural Optimization

Umer Khan

Department of Mechanical and Industrial Engineering

University of Toronto, Canada


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Outline

Introduction

Background

Methodology

Instructional Material Handout

Tutorial Video Tutorial

Presentation

Trial

Feedback

Future Work

Conclusions

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Introduction

Introduction to HyperWorks 10.0

PACE Global CAD course

Final year thesis

Investigation of an Optimization Driven Design Process

Problem

Difficulty faced in understanding structural optimization and using OptiStruct

Irrelevant tutorials Lack of introductory information

Explanation of results

Solution

Instructional material created for beginners

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Motivation

Power and capabilities of structural optimization methodsin design process

Creation of optimal structures with minimum inputs

Reduction in design cycle times

Build Confidence

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Background

Objective

Provide introduction on structural optimization and using OptiStruct

Good instructional material, besides text, contains

Visuals

Videos

Simulations

Challenge

Building knowledge from scratch can be time consuming and frustrating

Solution

Background information OptiStruct tutorials

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Methodology

Handout

Introduction to Structural Optimization

Tutorial

Topology Optimization of a Cantilever Beam

Video Tutorial

Topology Optimization of a Cantilever Beam

Presentation

Introduction to Structural Optimization and Altairs OptiStruct

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Handout

Objective

Understand background information on structural optimization

Clear explanations and examples using diagrams

5 page document covers the following topics

Optimization terminology

Structural optimization methods Problem formulation

Interpretation

Common errors

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Handout Sample Element Density

Topology Optimization

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Handout Sample Problem Formulation

(b,h) 150 MPa(b,h) 50 MPa

h 2b

The stresses have to be under acertain value.

CONTRAINTS

20 mm < b < 40 mm30 mm < h < 90 mm

I can change the width and the heightto minimize the mass.

DESIGN VARIABLES

min m(b,h)I want to minimize mass.OBJECTIVE

L

h

b

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Tutorial

Objective

Learn to perform topology optimization with OptiStruct

Each step includes

Screen shot

Explanation

Used as future reference

50 page tutorial covers the following topics

Importing IGES files

Meshing design space

Applying loads and boundary conditions Setting optimization parameters

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Tutorial Sample Optimization Problem

2000 mm

1000 mm

100 mm

OBJECTIVE Minimize Volume

DESIGN VARIABLE Element density

CONTRAINT Max. Displacement is 0.01 mm at free end

2 kN 2 kN

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Tutorial Sample OptiStruct Analysis

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Tutorial Sample Applying a Force

We will now create forces on two nodes as defined by the problem statement, 2000 Neach. Note that a negative sign has been placed before the force in order to stayconsistent with the HyperWorks coordinate system which is shown at the bottom left

of the screen.

2. Click on nodes

4. Set magnitude = -2000

5. Choose y-axis

1. Click on create

3. Choose these two nodes

6. Click create

7. Click

return

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Tutorial Sample Solution

Topology Optimization

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Video Tutorial

Objective

Illustrate every click along with explanations

Divided into parts

Importing geometry

Finite element model setup

Optimization parameters

Optimization solution (HyperView)

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Video Tutorial Sample Importing Geometry

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Presentation

Covers contents of handout in detail

Clarifies concepts which create confusion

Illustrates use of structural optimization in design process

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Trial

Presented instructional material to Advanced CAE and Applicationsclass, Bingham Young University (Provo, Utah)

Supplied handout and tutorial 1-hour lecture via video conference

Presentation outline

Structural optimization in the design process

Advantages of using structural optimization Background

Simple examples

Review of tutorial

Survey distributed after presentation

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Feedback

I found the tutorial very nice and good to follow I found it very useful in

helping me to learn more about how to use HyperMesh.

I finally understood what the click here instructions in the tutorials were

actually doing.

Suggestion

It would be useful to now have a next level tutorial, asking us to createcollectors, create constraints,etc. and allow us to then do it ourselves. I

feel this would reaffirm the process on a general level and help realize

exactly what were trying to achieve with each click here.

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Future Work

Introduce software to more students

Create more material Size/shape, topography optimization

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Conclusions

Creating effective instructional material

Background information

Simplified tutorials Presentation

Building confidence

Increasing use of software

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Thank You

Professor W. L. Cleghorn

University of Toronto

Professor C. G. Jensen

Bingham Young University

PACE (Partners of the Advancement of Collaborative Engineering

Education)

Altair Engineering

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Questions

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Documents

INSTRUCCIONS FOR OPTIMIZATION