advanced design for complex systems - 중앙대학교 시스템...

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Advanced Design for Complex Systems(1. Introduction)

Associate Professor Hae-Jin ChoiThe School of Mechanical Engineering

Chung-Ang University

Integrated Systems Design Lab. Chung-Ang University

Course Info

n Professor : Choi, Hae-Jin, ¨ Bobst hall 226, (Email) [email protected], (Office) 02-820-5787,

(Mobile) 010-6726-6096

n Class : ¨ Wed (3-6 pm), 302(Graduate hall)-302

n Text books:¨ McDowell et. al. (2010), Integrated Design of Multiscale,

Multifunctional Materials and Products, Butterworth-Heinemann.¨ Related papers (handouts or email distribution)

n Assessment : ¨ Continuous assessment (10%), mid-term (50%), class project

(40%)

n Office hour: Email appointment

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Characteristics of Complex Systems

n Uncertainty¨ Natural uncertainty (variability)¨ Model parameter uncertainty¨ Model structure uncertainty

n Complex structures¨ Hierarchy¨ Multiple scales ¨ Multidisciplinary, Multiple

peformances

n High performance¨ Extreme/uncertain condition

n Long lifecycle time¨ Long development time

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Continuum

Microscale

Molecular

Quantum

Integrated Systems Design Lab. Chung-Ang University4

Multifunctional Energetic Structural Materials Design

concrete wall

Energetic/Structural Materials

Metal noseMonofunctional energetic materials

Mission: Design of Multifunctional Energetic/ Structural Materials (MESMs)


Innovative Materials and Products Design

System

Assembly

Part

Continuum

Microscale

Molecular

Quantum

MaterialSelection

Structure

Properties

Performance

Goals/means (inductive)

Cause and effect (deductive)

Processing

Structure

Properties

Performance

Goals/means (inductive)

Cause and effect (deductive)

Processing

(Olsen, Science,1997)

Tailoringmaterial structure and processing paths to achieve properties and performance levels that are customized for a particular application…..(Seepersad et al., 2004)


System Level Model

MESM Multiscale Simulation ModelsMultiscale Design Variables

Material: Constituents; Sizes and Volume Fractions of Particles; Spatial statistics

Atomic-level Model[Lu, Wu, Patsamatla]

y

x

syy

4mm

Continuum Level Model[Reding]

Non-equilibrium Thermodynamic Mixture Model

Reaction Initiation Temperature (fn. of Material parameters)

Multifunctional Characteristics

Dynamic Strength

Reaction initiation: density of reaction initiation sites and associated probability

Discrete Particle Mixture Model [Austin]22 µm

11 µm

Micro-level ModelEOS* = Equation of State


Linear Cellular Alloy Heat Exchanger

OxidePowders H2O

H2

Honeycomb Extrusion

Direct ReductionFinished Metal Part

Compounding

Step TwoShape Fabrication

Step ThreeDirect Reduction

DryingAdditives

Step OnePaste Preparation

Flexible Die Design

**Courtesy of Lightweight Structures Group, Georgia Tech

OxidePowders H2OH2O

H2

Honeycomb Extrusion

Direct ReductionFinished Metal Part

Compounding

Step TwoShape Fabrication

Step ThreeDirect Reduction

DryingAdditives

Step OnePaste Preparation

Flexible Die Design

**Courtesy of Lightweight Structures Group, Georgia Tech


Challenge: Random Cell Wall Failuren Random error of heat transfer rate under random cell

wall failure

-0.01 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09-0.01

0

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.09varied h & constant T hot= 2000

-0.01 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09-0.01

0

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08


-0.01 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09-0.01

0

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08


W

H

D

w1 w2 w3 wNh. . .

h2

h1

hNv

th

tv

HeatSourceTsource

Air Flow, Tin

.

.

.

x

y

z

Unparameterizable Variability


n Frequency: up to 56 MHzn Q Factor: 8,000 at 20 MHzn Mass sensitivity: 60-220 µm2/ng

Radial Disk Resonator based Biosensor

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Strategic Product Design

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Product design with accurate prediction of future customer requirements

Long lifecycle of complex systems


Blast Resistance Panel (Sandwich)n Multiobjective design goals

¨ Maximum energy absorption¨ Lightweight¨ Robust to uncertainty in impulse loading

Front face sheet

Core

Back face sheet

Thompson, S. C., H. Muchnick, H.-J. Choi, D. L. McDowell, J. K. Allen and F. Mistree, 2006, "Robust Materials Design of Blast Resistant Panels,” 11th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference Portsmouth, Virginia. AIAA-2006-7005.

•3 stage of deformation theory (Fleck and Deshpande)•Shear off constraints (Xue and Hutchinson)•Spherical loading blast model•Cambridge ANN materials models


Syllabus

n Introduction to complex engineering systems design methodology. (1 week) ¨ Factors that contribute to complexity: multiple objectives,

uncertainty, multiple disciplines, multiple scales, concurrency. ¨ Examples of complex engineering systems.

n Design of experiments and metamodeling. (3 weeks)¨ Alternative experimental designs, including factorial, fractional

factorial, and Latin Hypercube designs. ¨ Metamodeling methods, including response surfaces and kriging. ¨ Applications of designed experiments and approximate models

for design space exploration. ¨ Design and manufacturing in decentralized environments

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Syllabus

n Multiobjective decision-making (2 weeks) ¨ Pareto sets and trade-offs. ¨ Basic multiobjective formulations: weighted sum,

compromise programming, etc. ¨ Utility theory. Game theory. ¨ Satisficing methods and goal programming.

n Decision-making under uncertainty (2 weeks) ¨ Sources of uncertainty. Representation of uncertainty. ¨ Propagation and estimation of uncertainty. Robust

design principles and methods. ¨ Design flexibility with robust design methods.

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Syllabus

n Multiscale design methods (2 weeks) ¨ Overview of multidisciplinary and multiscale design

problem formulations. Issues of coupling, decomposition, and collaboration.

¨ Robust design for multidisciplinary applications. n Design for market systems (1 weeks)

¨ Product platform and family design¨ Strategic product design

n Seminar with individual projects (3 weeks)

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advanced design for complex systems - 중앙대학교 시스템...

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