MET 503
Applied Optimization – Spring 2015
Instructor:
Mark French
121
Knoy Hall
desk: 7654947521
mobile: 7657149382
email: rmfrench@purdue.edu
Syllabus:
Date 
Topic 
Homework
(10 pts/problem) 
Due Assignments are due by 4:30 on the day listed at the homework
drop box in Knoy Hall 
1/12 
Intro
to optimization Lifeguard
problem 


1/14 
Binary Search 


1/16 
HW #1: Solve Lifeguard
problem using binary search ·
Δx = 30 ·
Exit criteria: o
Change in Δx < 1m and o
Change in T* < 1% ·
Repeat the solution with Δx
= 18 You
can do the problems by hand or with MathCad 
Due: 1/23 

1/19 
MLK
Day 

1/21 


1/23 
Successive Parabolic
Approximations Exit
Criteria Solving
Simultaneous Equations on a TI89 
HW #2: 1  Given the two
variable function: ·
Find the minimum value of this function and its
location graphically (4 significant figures) ·
Find the minimum using the minimize function in Mathcad 2 – Solve shopping
mall problem ·
Graphically (4 significant figures) Using
minimize function in Mathcad 
The
Shopping Mall Problem Find parking place
that minimizes distance walked between three stores. You take a package back to the car after
visiting the second store. All
distances are in meters. Due:
1/30 
1/26 
SnapThrough
Spring problem statement Physical
Problems: o
TwoBar Truss Problem 


1/28 
Local
vs. Global Minima Marching Grid: 2D analogy to binary search Two Variable Monte
Carlo Example 
HW #3: Solve the Two
Variable Lifeguard Problem using marching grid. ·
Starting point:
x1=50m, x2=50 ·
Initial step size: Δx=30m ·
Exit criteria: o
Δx < 0.5m o
Change in T < 0.5%

Due: 2/4 
1/30 
Marching
Grid Class Example 


2/2 
Least
Squares Curve Fits 
HW #4: Least Squares Curve
Fitting 1)
Do a parabolic
curve fit of the following data: x y 0 0 1 1 2 1 3 1 Find
the curve fit by setting the gradient equal to zero and solving the resulting
three equations. 2)
Do an exponential curve fit of the following data x y 1 1 2 2 3 3 4 4 Find
the curve fit by setting the gradient equal to zero and solving the resulting
two equations. Note: exponential curve is 
Due: 2/9 
2/4 
Steepest
Descent Gradient
of Objective Function 
HW #5: Three variable
function ·
Starting Point, x=4, y=8, z=4 ·
Given Δx = Δy = Δz = 1, do 2
steps of marching grid search ·
Find minimum using steepest descent o
Use mathcad minimize function
for 1D search o
Exit criteria (satisfy one) 1.
15 iterations 2.
ΔF < 1% 3.
Δx, Δy and Δz all less
than 1% 
Due 2/11 
2/6 
Steepest
Descent Using Binary Search for 1D Minimization 


2/9 

HW #6: ·
Starting point x=2, y=2 ·
Do four iterations of steepest descent ·
Plot F(d) to find d* for each iteration ·
Plot path through design space What
is the angle between successive search directions? 
Due 2/23 
2/11 
Exam
1 Review 


2/13 
Exam 1 


2/16 
Conjugate
Gradient Method 


2/18 
Conjugate
Gradient Method 
HW #7: Conjugate Gradient
Method Estimate
the minimum value of the bug splatter function (page 231) ·
Use steepest descent starting at x=4, y=1 ·
Use the conjugate gradient method starting at x=4, y=1 Use the mathcad
minimize
function for the 1D search in both cases. Do
six iterations of each method. Plot
the path through design space of each method.
Please plot both on the same axes for comparison. 
Due: 2/25 
2/20 
Constraints Exterior
Penalty Function 


2/23 
Constrained
Optimization Problems 


2/25 



2/27 
Present
Optimization Papers from Literature 


3/2 
Structural
Optimization 


3/4 
Exterior
Penalty Function 


3/6 


3/9 



3/11 
Interior Penalty Function 
HW #8:
Constrained Optimization Problems ·
Minimize the surface area of a cylindrical can that
hold 500 mL of liquid using both interior and interior penalty function
methods o
Use steepest descent with Mathcad
minimize function for 1D search.
Initial design: D=100mm,
H=100mm 
Due: 3/25 
3/13 


3/16 


3/18 
Spring Break 

3/20 


3/23 
Design
Variable Linking Semester
Projects Finite Difference Gradients 
HW #9: Maximize the volume
of a box as shown in class. The
material from which the box is to be cut is 1m wide and 2m long. 1.
Assume the box is square when viewed from the top( x_{1} = x_{2}). Thus, there are two design variables. 2.
Allow all three dimensions of the box to vary, so there
will be three design variables. ·
Use the Interior Penalty Function (IPF) to find the
constrained maximum values for volume. ·
Write out the formal problem statement as we did in
class. ·
Use binary search for the 1D search. Choose an appropriate Δd. ·
Make sure to scale the search direction S using the
magnitude of S as shown in class. ·
Choose an appropriate value for R ·
Exit criteria: o
Δx_{1}, Δx_{2} and Δx_{3}
are all less than 1% o
ΔVol < 1% o
25 iterations.
Every 1D search counts as an iteration. Due: 3/30 

3/25 
Structural
Optimization 


3/27 
Adding
buckling constraints 
HW #10 Solve the two
variable box problem from HW #8 using finite
difference gradients. 
Due: 4/3 
3/30 



4/1 



4/3 

HW #11: Boundary Value Problem from Class using cubic
polynomial as test function. a) Use
Mathcad minimize function to find unknown parameters. b) Verify using steepest descent. You can use either analytical gradients or
finite different gradients. Use
Mathcad minimize function for 1D search 
Due: 4/8 
4/6 



4/8 
Exam 2 Review 


4/10 
Exam 2 
Exam 2 – Spring 2007 Answer Key 
Exam 2 will be a
takehome exam. I will email it to
the class on 4/10. The completed exam
will be due at the beginning of class on 4/15 
4/13 



4/15 
Structural
Optimization 


4/17 
Structural
Optimization Review of
Constraints 


4/20 

4/22 


4/24 



4/27 
Project Presentations 


4/29 
Project
Presentations 


4/31 
Project Presentations 










Links:
Wikipedia Article on Optimization
Wikipedia Article Least Squares Curve Fits
Wikipedia Article on Steepest Descent (Gradient
Descent)
Grading
Homework 15%
Exam
1 25%
Exam
2 25%
Project 35%