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ME 3112 Mechanics of Machines – Part I
The Antikythera Mechanism – NATURE v444 Nov 2006 , p534-538
Course Admin
1. Lecturer : Associate Professor Gerard Leng
2. Office : E2-02-37
3. Contact : 6516 6548 (office)
4. E-mail : [email protected]
5. Consultation : By appointment (M-F 12-2pm)
6. Website : http://dynlab.mpe.nus.edu.sg/mpelsb/
Gerard Leng, Mechanics of Machines
Text
1. F. Beer and E. Johnston, “Vector Mechanics for Engineers
– Dynamics”, 9th SI Edition, McGraw Hill. 2010.
2. C. L. Cleghorn, “Mechanics of Machines”, Oxford
University Press, 2005.
3. R. L. Norton, “Design of Machinery”, McGraw Hill, 2012.
CA/Exam
CA (20%) - lab , Exam (80%) – open book
Gerard Leng, Mechanics of Machines
Learning Outcomes for Part I
1. Understand the principles of kinematics and kinetics of rigid
body motion.
2. Apply the knowledge of kinematics and kinetics to the
analysis of mechanisms and machines.
Question : So what’s a mechanism ?
Answer : A means of generating a desired motion
Question : What’s a machine?
Answer: Mechanisms working together.
Gerard Leng, Mechanics of Machines
Lesson Plan – Part I
1. Revision of kinematics and dynamics of particles
2. Kinematics of rigid bodies
3. Kinetics of rigid bodies
4. Analysis of mechanisms and machines
Question : What kind of mechanisms ?
Gerard Leng, Mechanics of Machines
Example 1 : Crank slider
A means to convert linear motion to rotary motion or vice versa
crank
slider
Animate
Any applications ? Gerard Leng, Mechanics of Machines
Application : Internal combustion engines
Cutaway model of the V8 engineGerard Leng, Mechanics of Machines
Example 2 : Crank rocker or 4 bar mechanism
A means to convert rotary motion to oscillatory motion
Animate
crank
rocker
coupler
Where’s the 4th bar ?
Any applications ? Gerard Leng, Mechanics of Machines
Application : Exo-skeleton
Gerard Leng, Mechanics of Machines
Where’s the 4 bar mechanism?
Gerard Leng, Mechanics of Machines
Example 3 : Geneva mechanism
A means to convert continuous rotary motion to intermittent rotary
motion
AnimateAny applications ?
slotted wheel
pegged wheel
Gerard Leng, Mechanics of Machines
Application : Clocks and counting devices
Gerard Leng, Mechanics of Machines
Example 4 : Gears
A means to change the output rotating speed of a motor
External gear train
Gerard Leng, Mechanics of Machines
Animate
Fun example : Can you use gears to draw a straight line ?
ring gear
internal gear
Gerard Leng, Mechanics of Machines
Application : Wankel or Rotary Engines
Cutaway model of the Mazda RX-8 rotary engine
Gerard Leng, Mechanics of Machines
![[eBook] Mechanics of Machines Cleghorn) Answers](https://img.dokumen.tips/doc/110x75/5501eaa84a7959b63b8b4810/ebook-mechanics-of-machines-cleghorn-answers.jpg)
