Solved Problems in Mechanics
Problem 1: (Using SI units)
You pull a hovercraft with a force of 50 N along a sandbar that is 5 m long. How much work is
done on the hovercraft?
Solution:
The work done i
ENGR 290
Remote Control and Controller description
Figure 1: Remote control
Table 1: Remote control controls and indicators description
# Reference Function
1. D1 Power good indicator. When Dl flash
Bernoulli Equation
1
Outline
Introduction
Newtons Second Law
Along a Streamline
Normal to a Streamline
Physical Interpretation
Static, Stagnation, Dynamic and Total Pressure
Use of the Bernoulli Equat
Pressure and Fluid Statics
1
Mechanics
The study of object properties that relate to the dimensions of
distance or length [L], mass [M], and time [T]
Quantity
Units (SI)
Dimension
Displacement, distan
Introduction
A Hovercraft (or an air-cushion vehicle (ACV) is a vehicle that:
Flies like a plane but
Floats like a boat
Drives like a car.
It can hover over or move across land or water surfaces whi
Distributed Forces:
Centroids and Centers of Gravity
Introduction
The earth exerts a gravitational force on each of the particles
forming a body. These forces can be replace by a single
equivalent fo
Objectives:
1) Introduction to analysis and design of physical systems
2) System Classification
1) Introduction to analysis and design of physical systems
a) Performance Specification
b) Modeling
A t
Analytic Hierarchy Process
Objectives
1.
2.
3.
Use the multifactor evaluation process in making
decisions that involve a number of factors, where
importance weights can be assigned.
Understand the use
Design Process
1
What is Design?
The word design is often used as a
generic term that refers to anything that
was made by conscious human effort.
It is the creative process of turning
abstract ideas i
Find (&
perhaps build)
something
that satisfies
requirements
y1, y2, y3, etc.
Given parts &
components
x1, x2, x3, etc.
Design
process
something,
(i.e. a system)
How well does it
satisfy the
requireme
Evolution of a robot design
Chris Skonieczny
ENGR 290
Steps in the Engineering Design
Process
1. Define the problem
2. Generate alternative
concepts
3. Evaluate and select a
concept
4. Detailed design
ENGR 290
Introductory Engineering Team Design Project
Taught by Krzysztof (Chris) Skonieczny
What is engineering design?
The process of creating things that meet certain
requirements and perform speci
How do you design a hovercraft?
As part of a team! [Chp 20.3]
By following a schedule [Chp 20.2]
By following the steps in the Engineering
Design Process
How do you design a hovercraft?
As part of
ENGR 290 Introductory Engineering Team Design Project (3 credits)
Course Outline for Fall 2016
Lectures: Tuesdays and Thursdays 4:15-5:30pm,
MB 2.430 SGW
Instructor: Dr. Krzysztof (Chris) Skonieczny,
Steps in the Engineering Design
Process
1. Define the problem
2. Generate alternative
concepts
3. Evaluate and select a
concept
4. Detailed design
5. Design defence / review
6. Manufacturing and
testi
How do you design a hovercraft?
Problem definition
Requirements -> Specifications: basic mechanics
Design options / concepts
Simulation to better understand each option/concept
2D motion simulatio
How do you design a hovercraft?
Problem definition
Requirements -> Specifications: basic mechanics
Design options / concepts
Simulation to better understand each option/concept
Setting up 2D motio
How do you design a hovercraft?
Todays step:
1. Define and clarify
the problem
(Chp 21, 22.6)
[Source: Kosky, Chp 19.8]
Specifications
Where do specifications come from?
Analyzing the requirements
M
How do you design a hovercraft?
Todays step:
1. Define and clarify
the problem
(Chp 21, 22.6)
[Source: Kosky, Chp 19.8]
Specifications
Where do specifications come from?
Analyzing the requirements
M
Rigid Bodies:
Equivalent Systems of Forces
Introduction
Most bodies in elementary mechanics are assumed to be rigid, i.e., the
actual deformations are small and do not affect the conditions of
equili
Fluid Statics (Part B)
1
Outline
Overview
Pressure at a Point
Basic Equations for the Pressure Field
Hydrostatic Condition
Measurement of Pressure
2
Pressure at a Point: Pascals Law
Blaise Pascal (162
Pressure and Fluid Statics
1
Mechanics
The study of object properties that relate to the dimensions of
distance or length [L], mass [M], and time [T]
Quantity
Units (SI)
Dimension
Displacement, distan
1.
3.
4.
L > W, so we expect the plane to be rising.
c) For level flight at 36 m/s, we need L = W = 490 N.
We achieve this by changing the angle of attack, and thus CL. The required CL is found by:
49
Specification Title:
Date last modified:
Card
Conversation
Confirmation
Requirement(s)
List the need(s) or constraint(s) introduced by the customer
that motivate this specification
Specification
List
Steps in the Engineering Design
Process
1. Define the problem
2. Generate alternative
concepts
3. Evaluate and select a
concept
4. Detailed design
5. Design defence / review
6. Manufacturing and testi
ENGR 290 Introductory Engineering Team Design Project (3 credits)
Course Outline for Fall 2015
Lectures: Tuesdays and Thursdays 4:15-5:30pm,
MB 3.430 SGW
Instructor: Dr. Krzysztof (Chris) Skonieczny,
Steps in the Engineering Design
Process
1. Define the problem
2. Generate alternative
concepts
3. Evaluate and select a
concept
4. Detailed design
5. Design defence / review
6. Manufacturing and
testi
Steps in the Engineering Design
Process
1. Define the problem
2. Generate alternative
concepts
3. Evaluate and select a
concept
4. Detailed design
5. Design defence / review
6. Manufacturing and
testi
F ma
T I
m dm
I r 2 dm
I r 2m
(T rF )
T rF
L I
(t ) 0 t
p mv
v(t ) v0 at
1 2
at
2
(v(t ) 2 v02 )
x(t ) x0
2a
x(t ) x0 v0 t
1
2
2
( (t ) 02 )
(t ) 0
2
(t ) 0 0 t t 2
Ffriction = Fnormal
1
1
v1
1.
3.
4.
L > W, so we expect the plane to be rising.
c) For level flight at 36 m/s, we need L = W = 490 N.
We achieve this by changing the angle of attack, and thus CL. The required CL is found by:
49