應用力學(二)
Dynamics
朱銘祥教授
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Instructor: Prof. Ming-Shaung Ju (朱銘祥教授) (ME
Building 7th F Room 727, ext 62163)
Office hours: Thursday 2PM, Friday 2PM
Teaching Assistant: 黃繪禎 助教 (ME Building 12th F
Room C11, ext 62263)
Textbook: R. C. Hibbeler, Engineering Mechanics: Dynamics,
12th Ed., 2009.
Reference: J.L. Meriam, Engineering Mechanics:
Dynamics, 6th Ed., 2008.
What is Dynamics?
Branch of mechanics which deals with the motion
of bodies under the action of forces
Mechanics
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Statics – effects of forces on bodies at rest
Dynamics
Kinematics – study of motion of bodies without
reference to forces which cause the motion
 Kinetics – relates action of forces on bodies to their
resulting motion
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History of Dynamics
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Galileo Galilei, 1564-1642
Issac Newton, 1642-1727
Leonhard Euler, 1707-1783
Joseph L. Lagrange, 1736-1813
Applications of Dynamics
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Modern machines and structures operated with
high speed (acceleration)
Analysis & design of
Moving structure
 Fixed structure subject to shock load
 Robotic devices
 Automatic control system
 Rocket, missiles, spacecraft
 Ground & air transportation vehicles
 Machinery
 Human movement
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Procedures
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Read the problem & correlate actual physical
situation with theory
Draw any necessary diagram (e.g. free-body) &
tabulate problem data
Establish a coordinate system (reference frame) &
apply relevant principles (mathematical form)
Solve necessary equations algebraically then use a
consistent set of units & complete the solution
Study the answer using technical judgment &
common sense
Review the problem.
Example: pendulum
Outline
2/20 Introduction & Kinematics of a particle
3/7 Kinetics of a particle: Force and
Acceleration
3/14 Kinetics of a particle: Work and Energy
3/26 Kinetics of a particle: Impulse and
Momentum
4/9 Planar kinematics of a Rigid Body
4/23 Planar kinetics of a Rigid Body: Force and
Acceleration
Outline (cont’d)
5/7 Planar kinetics of a Rigid Body: Work and Energy
5/16 Planar kinetics of a Rigid Body: Impulse and
Momentum
5/28 Three-Dimensional Kinematics of a Rigid Body &
Overview of 3D Kinetics of a Rigid Body
6/13 Vibrations: under-damped free vibration, energy
method, undamped forced vibration, viscous damped
vibrations
Grading
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Quiz and Homework 20%
1st Midterm
25%
2nd Midterm
25%
Final Exam
35%
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Total = 105% ??
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Notes:
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Suggest to take lecture notes!
Homework be assigned on a weekly basis, a quiz
after a Chapter is finished
Homework should be hand-written
Solutions to homework problem set will also be post at
FTP (140.116.155.72；Port：21；user: student,
password: student)