Electromechanical Systems
ASE 375
Lecture 21:
Optical Whole Field Measurement
(Digital Image Correlation, DIC)
How can we measure vibration of a rotor blade
Complicated Setup (a for Displacement Sensor):
Reference Frame
Mounting the Sensor
Reference
W

Lecture 28
Flow over a circular cylinder
09
11:53
Stream functions for elementary flows
Table 3.1
Type of flow
2
Inviscid, Incompressible Flow
Uniform flow in
x direction
Source
mber 6, 2009
son-98101
11:53
book
CHAPTER 3
November 6, 2009
Velocity
Fundame

Lecture 31
Intro to CFD and
Panel Methods
Approaches to Analyzing Fluid Flows
There are three ways aerodynamics can be studied
Analytical
Develop closed form solutions such as potential flow solutions
Ex., Superposition of simple fluid structures to g

Lecture 38
Biot-Savart Law
Prandtls Lifting Line Theory
Effect of downwash in finite wings
V
aeff < a
Effective angle of attack for a finite wing is lesser than an
infinite wing
CL < Cl
Lift coefficient for a finite wing is lesser than an infinite
wi

Lecture 27
Stream functions for elementary
flows
Stream function equation
The stream function can be related to the velocity
components using the relationships below
4.7 The Stream Function
, let us eliminate unsteady flow, which is a peculiar and unre

Lecture 33
Classical Thin Airfoil Theory
induces an infinitesimally small velocity dV at point P. Fro
dV is given by
ovember 6, 2009
11:53
PA R T 2
Inviscid, Incompressible Flow
Vortex Filament
Vortex Sheets
ds
2r
and is in aFigure
direction
to r , as sh

ASE 320, Midterm Exam
March 2, 2016
Name:
Closed Book: You may not consult any outside resources for this test (including books, homework,
cellphones, etc.) EXCEPT a single 3"XS index card of notes. You must clearly define your notation and
show control

\
Qo\ ~Ohf:
ASE 320, Midterm Exam
April 20, 2016
Name:
Closed Book: You may not consult any outside resources for this test (Including books, homework,
cellphones, etc.) EXCEPT two 3")(5' Index card of notes. You must clearly define your notation and sh

CHAPTER 4
' 4.1 qoo= 0; may.2 = % (0.002377x50)2 = 2.97 113/112 '
=0.64 and cm =-0.036
L'= q. s c, = (2. 97)(2)(1)(o 64)
M m = q, s c c = (2. 97)(2)(1)(2)( o 36) '
_-"
4.2 q.= % p. v.,= _;. (1 .23)(50)2 = 1538N/m
cl = _I.l_=_13 =044
_ qGS (1538)(2)
From

3.13
* _._-'-.
'9 (I .A. "A
_ Shynad
AtpointA: Vclocityducto mtream=vn
._;1_
.231: + b)
(notgthat it is in the negative x-direction)
Velocity due to source =
Velocityduetosink= 419.).
25(r+b)
(Note that it isinthe positive x-dirwtion)
Totalvelocityatl

Homework 10
Anderson 4.1, 4.2, 4.5
And
1)
2i
The leading edge of the wing of a F-117 Stealth ghter is sharp and has a half angle of
ten degrees. (An F-117 uses old stealth technology called the disco ball effect wherein
the plane is made of at panels that

Lecture 29
Magnus Effect
Lifting Flow over a circular cylinder
The Magnus Effect
https:/www.youtube.com/watch?v=nPQYvGvJ6uo
https:/www.youtube.com/watch?v=2OSrvzNW9FE
A spinning ball or cylinder deviates from its trajectory.
German physicist, Magnus, de

Lecture 39
Wing Geometry Considerations
Delta Wings
ection 5.1,i (y
eff 0is
) the
= angle of attack actually seen by the local airfoil
(5.18)
4
V
y
y
b/2
is
also
variable;
the
downwash
varies
across
the
span,
then
0
eff
(5.15) is important in that it give

Lecture 30
Kutta-Joukowski Theorem
Theory vs Experimental Observations
on Cylinder Flows
re 3.32. Note that the streamlines are no longer symmetrical about
l axis through
point O, and you might suspect (correctly) that the
Lifting Flow over a Circular Cy

Electromechanical Systems
ASE 375
Lecture 20: Optical Measurements
Optical Metrology
Optical metrology uses the changes in the properties of light
to measure physical phenomenon (optical or non-optical)
Motion (displacement, velocity acceleration) is m

Electromechanical Systems
ASE 375
Lecture 18: Optical Measurement Techniques
(PhotoDiodes)
Conductors vs Insulators
Conductors
Ex: Metals
Flow of electricity
governed by motion of
free electrons
As temperature increases,
conductivity decreases
du

Electromechanical Systems
ASE 375
Lecture 19: Triggered Data Acquisition
Photodiodes
Photodiodes are semiconductor light sensors that generate a current or voltage when the P-N
junction in the semiconductor is illuminated by light
When a photon of suffic

Electromechanical Systems
ASE 375
Lecture 16: Frequency Response, Shakers - 1
Analysis of Time Signals
Any periodic function can be
rewritten as a weighted sum of
Sines and Cosines of different
frequencies.
Superposition of n-Sine Waves
Enough sine

Electromechanical Systems
ASE 375
Lecture 17: Frequency Response, Shakers - 2
Single Degree of Freedom System - Example
lements
of the physiFigure 1.3
1.2
iscrete
.
.
Equation of
be
described by the
mx + cx + kx = f(t)
ter model
motion
tion shown in Figu

Electromechanical Systems
ASE 375
Lecture 26: Review for Test 2
Overview
Lecture 14-25
Dynamic Measurements
Accelerometers, Impulse and Frequency Response,
Shakers, Hydraulic/Pneumatic
Optical Measurements
Photodiodes, Triggered Data Acquisition,

Electromechanical Systems
ASE 375
Lecture 15: Dynamic Measurements,
Accelerometers - 2
Classes of Acceleration
There are three main classes of motion we can define
Motion
Motion is defined as "slow" changes in position or
velocity. Some examples inc

Electromechanical Systems
ASE 375
Lecture 22: Acoustics Measurements - 1
Please Note These Date Changes
Apr 12th - No Class
Apr 24th - Review Session for Test 2
Apr 26th - Test 2
Acoustics Areas of Study
Architectural Acoustics deals with sound in and

Electromechanical Systems
ASE 375
Lecture 24: Acoustics Measurements - 2
Sound Pressure
Atmospheric pressure is 101325 N/m2 (Pa)
Acoustic pressure variations from this mean are typically a
few micro-Pascals to a few Pascals!
Intensity of a sound wave

Lecture 35
Review for Test 3
Key concepts for Test 3
Reduction of Navier Stokes to Euler equations to Eulers equation
Eulers equation
Bernoulli equation
Stagnation Point, Stagnation Pressure, Static Pressure, Dynamic Pressure
Pitot tube vs Pitot Static So

Lecture 37
Finite Wing Analysis
Downwash, Induced Drag
Whats good for the Goose.
Why do geese fly in a V-formation?
How do winglets improve
performance, safety and efficiency?
Finite Wings : Geometric Parameters
Finite Wing Aerodynamics
Upper surface of

Homework 9
Anderson 3.13, 3.15, 3.17, 3.18, 3.19
And
1) Line sources of equal strength q/Zn = Ua, where U is a reference velocity, are PIECEd at (LY) =
(O,a) and (0,-a). Sketch the streamlines and lines of constant velocity potential in the upper half
pla

Low Speed Aerodynamics
ASE 320
Lecture 17: Stream function
What is a flow?
Flow of air over an airplane
Flow of water in pipes
Blood flow in the human body
Traffic flows can be treated as compressible
flow behavior
Migration of animals modeled as lam

Lecture 23
Review for Test 2 Part 1
Streamlines
Streamlines represent the tangent to the velocity vector at
any point in time.
They show the instantaneous flow-field
Used for visualization when modeling a flow field.
Single snapshot in time, good f

Low Speed Aerodynamics
ASE 320
Lecture 4: Dimensional Analysis,
Buckingham Pi theorem
Why dimensional analysis?
How do you test the performance of a Boeing 737
flying at 800 km/hr?
NASA-Ames 120x80 ft tunnel
You could rent the largest wind-tunnel in