Ink Dot Technique of Flow Visualization for the
Undergraduate Fluid Mechanics Laboratory
William S. Janna1
AbstractThe ink dot technique consists of applying ink dots on a surface of an object that is placed in a low
speed wind tunnel. The dotted area is
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Chapter 3General Forced Response
Section 3.1Impulse Response Function
MEEG 3113 Machine Dynamics and Control
Concept of Forced Response
Landing Gears of Boeing 747-8
Provides stiffness and dampin
Chapter 4
FLUID KINEMATICS
LAGRANGIAN AND EULERIAN DESCRIPTIONS
Kinematics: The study of motion.
Fluid kinematics: The study of how fluids flow and how to describe fluid motion.
There are two distinct ways to describe motion: Lagrangian and Eulerian
Lagra
Chapter 1
INTRODUCTION AND
BASIC CONCEPTS
What is a fluid?
2
Three Different Phases
Intermolecular bonds are strongest in solids and weakest in gases.
Solid: The molecules in a solid are arranged in a pattern that is
repeated throughout.
Liquid: In liquid
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Chapter 2Harmonic Excitation
Section 2.1Harmonic Excitation of Undamped Systems
Section 2.2Harmonic Excitation of Damped Systems
MEEG 3113 Machine Dynamics and Control
Concept of Resonance
Harmon
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Chapter 3General Forced Response
Section 3.4Transform Methods
Section 3.7Measurement Via Transfer Function
Section 3.9Numerical Simulation of the Response
MEEG 3113 Machine Dynamics and Control
Tr
Chapter 2
PROPERTIES OF FLUIDS
INTRODUCTION
Property: Any characteristic of a
system.
Some familiar properties are
pressure P, temperature T, volume
V, and mass m.
Properties are considered to be
either intensive or extensive.
Intensive properties: Those
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Section 2.4 Base Excitation
MEEG 3113 Machine Dynamics and Control
Base Excitation
Important Class of Vibration Analysis
Preventing excitations from passing from a vibrating base
through its mount
Class Project 2
Design, Print, and Calibrate an Air Velocity Meter
Objective
Project teams will design, print, and calibrate 3D models of a pitot tube and water manometer
Tasks
Study theories of pitot tube and water manometer as air velocity meters
Print
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Chapter 3General Forced Response
Section 3.2Response to an Arbitrary Input
Section 3.3Response to an Arbitrary Periodic Input
MEEG 3113 Machine Dynamics and Control
Response to an Arbitrary Input
Chapter 3
PRESSURE AND FLUID
STATICS
PRESSURE
Pressure: A normal force exerted by a fluid per unit area
Atmospheric Pressure = 14.69psi
Some
basic
pressure
gages.
2
PRESSURE (Static) Definitions
Absolute pressure: The actual pressure at a given position.
Chapter 5
MASS, MOMENTUM AND ENERGY
EQUATIONS CONTROL VOLUME
Introduction
You are already familiar with numerous conservation laws such as
the laws of conservation of mass, conservation of momentum, and
conservation of energy.
Historically, the conservati
Class Project 1
Flow Visualization of Ink Traces Around Scaled Models
Objective
Project teams will fabricate scaled models using 3D printers and visualize fluid flows around
models using ink dot technique
Tasks
Study background of flow visualization
Desig
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Chapter 1Sections 1.5 and 1.6
Stiffness and Measuremnet
MEEG 3113 Machine Dynamics and Control
More on Springs and Stiffness
A spring-like behavior results from a variety of configurations, includ
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Chapter 1Sections 1.7, 1.9, and 1.10
MEEG 3113 Machine Dynamics and Control
Design Considerations
Using the analysis so far to
guide the selection of
components.
MEEG 3113 Machine Dynamics and Con
MEEG 3113 MACHINE DYNAMICS AND CONTROL
Computer Project Number 1
Due Monday, January 30, 2017 By 4PM
THIS SHOULD BE DONE IN A GROUP OF 2 AND NO MORE
THAN 3 STUDENTS
TURN IN ONE SOLUTION PER GROUP
ABSOLUTELY NO INDIVIDUAL PROJECT WILL BE ACCEPTED
YOU A
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Chapter 1Sections 1.3 and 1.4, Viscous
Damping and Energy Methods
MEEG 3113 Machine Dynamics and Control
DampingWhy is it Important?
2
MEEG 3113 Machine Dynamics and Control
DampingWhy it is Impor
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
IntroductionBackground Information
Chapter 1Sections 1.1 and 1.2, Free
Vibration and Harmonic Motion
MEEG 3113 Machine Dynamics and Control
Vibration is Everywhere
Boeing 747 Landing
http:/www.you
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Chapter 1Sections 1.6, 1.7, 1.9, and 1.10
MEEG 3113 Machine Dynamics and Control
Measurement
Mass: usually pretty easy to measure using a balancea static experiment.
Stiffness: again can be measur
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Chapter 3General Forced Response
Section 3.1Impulse Response Function
MEEG 3113 Machine Dynamics and Control
Concept of Forced Response
Landing Gears of Boeing 747-8
Provides stiffness and dampin
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Chapter 1Sections 1.3 and 1.4, Viscous
Damping and Energy Methods
MEEG 3113 Machine Dynamics and Control
DampingWhy is it Important?
2
MEEG 3113 Machine Dynamics and Control
DampingWhy it is Impor
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Section 2.3 Alternative Representations
MEEG 3113 Machine Dynamics and Control
Alternative Representations
A variety methods for solving differential equations
So far, we used the method of unde
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Section 2.2Harmonic Excitation of
Damped Systems
MEEG 3113 Machine Dynamics and Control
Harmonic Excitation of Damped
Systems
Extending resonance and response calculation to damped
systems
The i
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Section 2.4 Base Excitation
MEEG 3113 Machine Dynamics and Control
Base Excitation
Important Class of Vibration Analysis
Preventing excitations from passing from a vibrating base
through its mount
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Chapter 1Sections 1.4 and 1.5,
Lagrange Method and Stiffness
MEEG 3113 Machine Dynamics and Control
Lagranges Method for deriving
equations of motion.
Again consider a conservative system and its
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Chapter 2Harmonic Excitation
Section 2.1Harmonic Excitation of Undamped Systems
MEEG 3113 Machine Dynamics and Control
Concept of Resonance
Harmonic Excitation is a sinusoidal external force appl
MEEG 3113, MACHINE DYNAMICS
AND CONTROL
Prof. Uche Wejinya
Chapter 1Sections 1.1 and 1.2, Free
Vibration and Harmonic Motion
MEEG 3113 Machine Dynamics and Control
Free Vibrations
Vibration deals with how objects motion repeats relative to
a stationary r