eng1040 lec01

Faculty of Engineering

ENG1040 – Engineering Dynamics

ENG1040Engineering Dynamics

A Welcome and Introduction

Dr Lau Ee Von – Sunway

Lecture 1

Outline

• Introduction to Engineering Dynamics

• What is in the Unit Outline?

• Aids for Learning

• Foundation Concepts - Motion

Lecture Outline

Introductions

Summary of Unit Outline

Aids to Learning

Foundation Concepts

Lecture Outline

Introduction


Aids to Learning

Foundation Concepts

A little about me...

• BEng (Hons), PhD• Office room: 5-5-17• E-mail: [email protected]

mailto:[email protected]

What is Engineering ?

“Engineering is the application of scientific principles to design and implement devices that realize a desired objective and meet specific criteria.”

• More simply put:

• In this unit we will learn about models which are used to predict the motion of, and forces acting on, mechanical devices.

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Lecture Outline

Introduction


Aids to Learning

Foundation Concepts

ENGINEERS PREDICT OUTCOMES WITH MODELS

What is Mechanical Engineering ?

• Mechanical engineering is a subset of engineering.

• Mechanical engineers design devices:

• Which move through air and water (among other fluids)

• Which convert energy (generating power, designing vehicles)

• Which continue to operate safely over many operations.

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Lecture Outline

Introduction


Aids to Learning

Foundation Concepts


• Mechanical Engineering comprises a number of subtopics.

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Dynamics

Thermodynamics Fluid Dynamics

Materials Design / Solid Mechanics

Control Systems

Lecture Outline

Introduction


Aids to Learning

Foundation Concepts


Thermodynamics:Answers the following questions:• How is heat transferred ?• How can we transform energy to useful

forms ?• How can we design efficient machines ?

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Lecture Outline

Introduction


Aids to Learning

Foundation Concepts




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Lecture Outline

Introduction


Aids to Learning

Foundation Concepts




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Lecture Outline

Introduction


Aids to Learning

Foundation Concepts


Fluid Dynamics:Answers the following questions:• What are the forces acting on a body moving

through a fluid ?• How much energy does it take to transport a

fluid ?• How does turbulence affect flows, and how is it

generated ?

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Lecture Outline

Introduction


Aids to Learning

Foundation Concepts





generated ?

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Lecture Outline

Introduction


Aids to Learning

Foundation Concepts





generated ?

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Lecture Outline

Introduction


Aids to Learning

Foundation Concepts


Control Theory:Answers the following questions:• How can we safely control the motion of moving

bodies ?• How can we design automated robots safely ?

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Lecture Outline

Introduction


Aids to Learning

Foundation Concepts


Control Theory:Answers the following questions:• How can we safely control the motion of moving

bodies ?• How can we design automated robots safely ?

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Lecture Outline

Introduction


Aids to Learning

Foundation Concepts


Materials DesignAnswers the following questions:• What is a suitable choice of material ?• How do imperfections (such as cracks) develop

over time ?

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Lecture Outline

Introduction


Aids to Learning

Foundation Concepts


Materials DesignAnswers the following questions:• What is a suitable choice of material ?• How do imperfections (such as cracks) develop

over time ?

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Lecture Outline

Introduction


Aids to Learning

Foundation Concepts


DynamicsAnswers the following questions:• What are the governing equations for moving

bodies ?• How is energy transferred ?• How can we use this knowledge to make

practical devices ?

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Lecture Outline

Introduction


Aids to Learning

Foundation Concepts




practical devices ?

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Lecture Outline

Introduction


Aids to Learning

Foundation Concepts




practical devices ?

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Lecture Outline

Introduction


Aids to Learning

Foundation Concepts


• Dynamics underpins Mechanical Engineering, but is not the only topic taught in the discipline.

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Dynamics

Thermodynamics Fluid Dynamics

Materials Design / Solid Mechanics

Control Systems

Lecture Outline

Introduction


Aids to Learning

Foundation Concepts

What is it all about?

• Engineering Dynamics• Deals with things that move…

• Foundation for analysis laid in this unit• Forces/torques• Vibrating systems• Simple mechanisms• Gears & belt drives

Lecture Outline

Introductions


Aids to Learning

Foundation Concepts

What will you learn in this unit?

• Dimension, Units and error estimation,

• Kinematics of Particles and Rigid Bodies,

Lecture Outline

Introductions


Aids to Learning

Foundation Concepts

• Translation and Rotation of bodies subjected to Forces and Torques,

• Work, Energy, Power,

• Free and damped vibrations


Lecture Outline

Introductions


Aids to Learning

Foundation Concepts

• Gear trains, belts and belt drives


Lecture Outline

Introductions


Aids to Learning

Foundation Concepts

• The application of the knowledge of translation and rotation of bodies to real engineering problems such as the slider/crank mechanisms and 4- bar linkages

Assessment Summary• Practice classes – 5% (starts in week 2)

• Lab – 5% (week 5)• Formal lab reports should be submitted within 2

weeks after lab practice

• Online quizzes – 0% (starts in week 4)• Fortnightly on-line quiz (an hour per quiz)• Two attempts per quiz• Immediate feedback on your progress with the

course

• Mid Semester Test - 10% (week 9)

• Project work – 10% (starts in week 6)• Project testing and grading on week 11 • Short report to be submitted on project testing

day

• Final Exam – 70%• Refer to Unit Guide for more details

Lecture Outline

Introductions


Aids to Learning

Foundation Concepts

Aids to Learning

• Lectures• 4 hours per week

• Venue: LT6005

• Monday 1.00 pm – 3.00 pm• Tuesday 10.00 am – 11.00 am • Wednesday 10.00 am – 11.00 am

• Available online Moodle 2.0 • Attendance strongly recommended!

Lecture Outline

Introductions


Aids to Learning

Foundation Concepts

Aids to Learning

• Consultation times...

• Room 5-5-17

• You are strongly encouraged to consult with me or the assigned tutors over any concerns you have with your learning in this unit.

Lecture Outline

Introductions


Aids to Learning

Foundation Concepts

Aids to Learning

• Practice Classes• 2 hours per week (worth 5% overall)

• Allocate

Starts in Week 2• Selected problem questions assessed

Lecture Outline

Introductions


Aids to Learning

Foundation Concepts

Aids to Learning

• Prescribed Text

Meriam, L. G. and Kraige, J. L. Engineering Mechanics: Dynamics, 7th Ed, Wiley, 2013

Lecture Outline

Introductions


Aids to Learning

Foundation Concepts

R. C. Hibbeler. Engineering Mechanics: Dynamics (SI), 12th Ed, Pearson, 2010

Aids to Learning

• Advice• You got here you thus have the ability to

pass

• Unit contains a lot of new material• Class attendance alone not sufficient• Expected that students spend 7 hours per

week on study for this unit• Catch yourself if falling behind – your

lecturer has consultation times use it!

• Mechanical Engineering entry• Competitive!• Pass everything with at least Credit average

Lecture Outline

Introductions


Aids to Learning

Foundation Concepts

Foundation Concepts

• PositionLecture Outline

Introductions


Aids to Learning

Foundation Concepts

Rectilinear motion Curvilinear motion

Motion in a straight line

Motion in a 3D curved path

Foundation Concepts

• DisplacementLecture Outline

Introductions


Aids to Learning

Foundation Concepts

Rectilinear motion Curvilinear motion

Foundation Concepts

• VelocityLecture Outline

Introductions


Aids to Learning

Foundation Concepts

Recilinear motion Curvilinear motion

Note: average speed is:

Total dist. travelled

Elapsed time

Foundation Concepts

• AccelerationLecture Outline

Introductions


Aids to Learning

Foundation Concepts

Recilinear motion Curvilinear motion

Note: Acceleration is a VECTORNegative acceleration =

deceleration Note: Acceleration is seldom tangent to the path line (blue)

Summary

• Dynamics describes how things move

• Through dynamics we can design and build useful engineering devices

• Dynamics is just part of Mechanical Engineering

• The four foundation concepts of dynamics are

• Position• Displacement• Velocity• Acceleration

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Lecture Outline

Introductions


Aids to Learning

Foundation Concepts

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