Modeling and simulation in engineering
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Modeling and Simulation in Engineering. Chris Paredis G.W. Woodruff School of Mechanical Engineering Georgia Institute of Technology. Lecture Overview. Objective: Define what a model is Illustrate why models are important in engineering Topics: What is a model?

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Modeling and Simulation in Engineering

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Modeling and simulation in engineering

Modeling and Simulationin Engineering

Chris Paredis

G.W. Woodruff School of Mechanical Engineering

Georgia Institute of Technology


Lecture overview

Lecture Overview

  • Objective:

    • Define what a model is

    • Illustrate why models are important in engineering

  • Topics:

    • What is a model?

    • What are some properties of models?

    • How does one create a new model?

    • How are models used in engineering?


What is a model

What is a Model?

  • Examples of Models…

  • What do these examples have in common?


Examples of models in vehicle design

Noise, Vibration,

and Harshness

Thermal

Crash Testing

Examples of Models in Vehicle Design

Computational Fluid Dynamics

Stress Analysis


What is a model1

All models are 'wrong'.

Some are useful.

Attributed to George Box

What is a Model?

  • Definition (based on Marvin Minsky's definition) :

    • A model (M) for a system (S) and an experiment (E) is anything to which E can be applied in order to answer questions about S

  • A model is an abstraction of reality

Who has created a new model today?


How do we create models

How Do We Create Models?

  • Gather data about real system

  • Postulate hypotheses about the relationships in the data

  • Formalize these hypotheses in models

  • Validate models by performing simulations

  • If necessary, modify the hypotheses and models until valid

    (Adapted from F. Cellier)


A quick aside when is a model valid

Models can never be proven correct – only falsified.

(Adapted from Karl Popper)

A Quick Aside:When is a Model Valid?

Is this model valid?

f(x)

x


Unanticipated phenomena may invalidate model

Unanticipated Phenomena May Invalidate Model

Tacoma Narrows Bridge,

Nov 7, 1940.


Why are models important in engineering

Simulator

Simulator

Simulator

Simulator

System

Model

System

Model

System

Model

System

Model

Why are Models Important in Engineering?

Initial

Guess

Satisficing

Solution

Decision

Solver

Predict theOutcome of Engineering Design Decisions

DesignAlternative

Evaluation ofDesign Alternative


When are models most useful

When are Models Most Useful?

  • When the system is not available

  • When the physical experiments cannot be performed

  • When the cost of experimentation is too high

  • When the time scale of the system is not compatible with those of the experimenter

  • Under controlled circumstance (e.g. no disturbances)


Examples of models in engineering

Noise, Vibration,

and Harshness

Thermal

Crash Testing

Examples of Models in Engineering

Computational Fluid Dynamics

Stress Analysis


Manufacturing simulation

Manufacturing Simulation

  • DFM – DFA – DFX

  • Take life cycle cost into account at the design stage


Training simulators

Training Simulators

  • Use the previously developed simulation models for training

  • Train operators before prototypes are built

  • Test whether user interface is user-friendly


Immersive environments

Immersive Environments

  • Allow user to interact with models through

    • 3-dimensional vision

    • Touch (tactile interface)

  • Complete virtual prototype


If a picture is worth 1000 words how about a simulation

Crash Testing

If a picture is worth 1000 words,how about a simulation?

Summary

  • We all create and use models all the time

  • Models should be validated

  • In engineering, models are used for predicting the outcome of decisions, but also for training or documentation.

  • In this class you will use models to solve engineering problems


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