AEEM-7027
2nd Midterm Exam
Name:_
2015 Fall Semester
Points:
/100
Solve 3 problems for a complete score.
Problem 1
Let us consider acoustic emission (AE) crack detection in a thin aluminum fuselage plate. The AE signal
is detected by two sensors A and B t
AEEM-7027
Final Exam
2014 Fall Semester
Name:_
Points:
/100
Solve 3 problems for a complete score.
Problem 1
Let us assume that the probability density function of the flaw size distribution in a given ensemble of
specimens is known p( x) = 3 x 2 if 0 x 1
AEEM-7027
Final Exam
2015 Fall Semester
Name:_
Points:
/100
Solve 4 problems for a complete score.
Problem 1
Let us assume that the probability density function of the flaw size distribution in a given ensemble of
specimens is known p( x) 2(1 x) if 0 x 1
AEEM-7027
2nd Midterm Exam
2014 Fall Semester
Name:_
Points:
/100
Solve 3 problems for a complete score.
Problem 1
Let us consider an SAE 1020 steel plate of thickness d = 20 mm immersed in water. The plate is
inspected by ultrasound in pulse-echo mode at
AEEM-7027
1st Midterm Exam
2014 Fall Semester
Name:_
Points:
/100
Solve 3 problems for a complete score.
Problem 1
Let us assume that the probability density function of the flaw size distribution in a given ensemble of
specimens is known to be p( x ) = 1
AEEM-7027
Final Exam
2016 Fall Semester
Name:_
Points:
/100
Solve three problems for a complete score.
Problem 1
Let us consider failure prevention of N = 1,000 critical components during service. The components are
exposed to intensive vibration that lea
AEEM-7027
1st Midterm Exam
2015 Fall Semester
Name:_
Points:
/100
Problem 1
An ensemble of N = 10,000 components contains ND = 100 defective components.
The known
Solve 3 problems for a complete score.
probability densities of the flaw signal and the mate
AEEM-7027
1st Homework
2016 Fall Semester
Problem 1
An ensemble of N = 10,000 components contains on the average ND = 100 defective ones. The
probability densities of the flaw signal and the material noise are pF (V ) 20(V 3 V 4 ) and
pN (V ) 10 e10V ,
re
UNIVERSITY OF CINCINNATI
DEPARTMENT OF AEROSPACE ENGINEERING & ENGINEERING
MECHANICS
20-251-7027 NONDESTRUCTIVE TESTING
Practice:
5-6 homeworks (not graded, solutions posted in 1 week)
midterm and final exams from the last two years posted
Grading:
40% fi
UNIVERSITY OF CINCINNATI
SCHOOL OF AEROSPACE SSYSTEMS
20-AEEM-7027 NONDESTRUCTIVE TESTING
Fall Semester
Data:
20-251-7027. Nondestructive Testing. 3 cr., Role of Nondestructive
Testing (NDT), materials behavior and failure modes, materials
characterizatio
Aerodynamics
AEEM 3014
Class introduction, Definitions, Review
Dr. C. Belloni
Admin stuff
Syllabus
Lecture:
Mon, Wed 1.25PM 2.20PM; Building: 60 W Charlton, Room: 277
Office Hour:
Monday and Wednesday 2.30-3.30PM, Old Chem 809D, or by appointment
Cour
Normal Shock Waves
Wave propagation is perpendicular
to flow direction
Shock is nonequilibrium process
internally, but
flow before shock (1) in equilibrium
flow after shock (2) in equilibrium
1
2
Approach to Finding Shock Properties
Start with statio
Example: P.G. State Eqns.
Given: Piston-cylinder containing CO
initially at 400. K, 1.0 atm. At later time
gas is at 800. K and 10. atm.
1
2
?
Find:
Change in specific volume (v1v2)
Change in internal energy (u2-u1)=u12
Change in enthalpy (h2-h1)=h12
Wo
Velocity Field Properties
How do we keep track of what is happening in a fluid?
Although a fluid consists of atoms and molecules, the continuum fluid assumption
(if valid) allows us to consider the net effect of many particles in each region of
flow. It
In-Class Problems
1. Nitrogen at 200 kPa and 250C flows through a 35 mm diam. pipe at
20 m/s. Find the mass flow rate of nitrogen through the pipe.
2. Liquid water enters the square duct
shown with an average velocity 10
200 mm
m/s. Determine the average
Basic Thermodynamic Concepts
(Review)
Need to define what matters when we talk about any
problem in TD (and fluids)
System region enclosed by an imaginary boundary (can
be rigid/flexible, stationary/moving, fixed
size/shrinking/expanding, etc.). This bo
Mach Angle and Mach Number
Looking for relationship between speed of sound and flow
speed (or speed of body moving through fluid)
Consider small body (point) moving in stagnant fluid
continuously launches weak pressure disturbances
(e.g., from pushing
Isentropic Nozzles
Apply equations for isentropic flow with area change
to nozzles
Nozzles
increases velocity of fluid (no work)
converts thermal energy to KE (Tu)
For conventional (wall-bounded) nozzles, two types:
converging
converging-diverging
Conservation Equation Introduction
A starting point for study of fluid dynamics is the derivation of basic fluid
equations.
These equations are derived from three fundamental Conservation Laws known
to you from physics and chemistry:
o Conservation of M
Orbits and Changing Orbits
AEEM1022 Intro. Aerospace
Ref: Sellers, Understanding
Space, Chapter 2
Orbital Mechanics
Highly Recommended Reading
Orbital Mechanics web page http:/
www.braeunig.us/space/orbmech.htm
Orbital Analysis History
Early astronomers
Rockets
A Brief Timeline of History
Early Rockets
Around 300 BC, the Greek
Archytas amazed the city of
Tarentum by flying a model
pigeon that was propelled by
escaping water vapors.
Around 50 BC, Hero of
Alexandria created an
aeolipile, which was a sphe
Introduction to Spacecraft
Part 1: History
AEEM1022 Intro. Aerospace
Early Powered Aircraft Flight
First powered aircraft flown
by reclusive designers
(Wright brothers)
Performed extensive
analysis & testing
invented the wind tunnel
First successful f
Introduction to Aerodynamics
How Fluids Flow
Aerodynamics
Everything we work on in Aerospace Engineering is touched by
Aerodynamics (fluid flow)!
Aerodynamics
Three Fundamental Principles
1. Mass is conserved
Continuity Equation (Conservation of Mass)
2.
OVERVIEW OF PROPULSION
SYSTEMS
Prof. Awatef Hamed
"How Jet Propulsion Works"
http:/www.scientificamerican.com/article/can-you-explain-how-jet-p/
Thrust/Fuel Flow Rate
for Propulsion Systems
Aircraft Engine with Afterburner
Prof. Awatef Hamed
Thrust Requir
Propulsion Systems
Major Propulsion Systems
Piston Engine
Jet Propulsion
Gas Turbine
Air cooled
Liquid Cooled Hybrid
Pulse Jet
Rocket
Ramjet
Centrifugal Flow
Solid Fuel Liquid Fuel
Some Turboprops and small turbojets
Rotary
Radial
Flat (Boxer)
V-12
Other
Intro to Aero
Review for Exam 2
Orbits: Conservation of Energy
If we know the initial speed V and initial distance r, we can compute
the initial energy (E) or specific energy ()
Because specific energy is constant, if we know its value, we can
solve for
Homework for
Aerodynamics - AEEM 3014
Homework 4 Due Wednesday Feb 22, start of class:
10 Questions on boundary layer and separation
Fox & MacDonald Problems 9.6, 9.111, 9.119,
Anderson 4.16
Dr. C. Belloni
Boundary Layer Theory Recap
Review sections 1.
Homework for
Aerodynamics - AEEM 3014
Homework 5 Due Wednesday March 22, start of class:
Questions on finite wings
Anderson 5.3, 5.7, 5.9, 5.11
Dr. C. Belloni
Finite Wings
I.
What is the source of downwash? Wing tip vortices
II.
What are the effects of