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應用力學 ( 二 ) Dynamics

應用力學 ( 二 ) Dynamics. 朱銘祥教授. 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)

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應用力學 ( 二 ) Dynamics

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  1. 應用力學(二)Dynamics 朱銘祥教授

  2. 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.

  3. What is Dynamics? Branch of mechanics which deals with the motion of bodies under the action of forces

  4. Mechanics • 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

  5. History of Dynamics • Galileo Galilei, 1564-1642 • Issac Newton, 1642-1727 • Leonhard Euler, 1707-1783 • Joseph L. Lagrange, 1736-1813

  6. Applications of Dynamics • 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

  7. Procedures • Read the problem & correlate actualphysicalsituation with theory • Draw any necessarydiagram (e.g. free-body) & tabulate problem data • Establish a coordinatesystem (reference frame) & apply relevant principles (mathematical form) • Solve necessary equationsalgebraically then use a consistent set of units & complete the solution • Study the answer using technical judgment & common sense • Review the problem.

  8. Example: pendulum

  9. 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

  10. 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

  11. Grading • Quiz and Homework 20% • 1st Midterm 25% • 2nd Midterm 25% • Final Exam 35% • Total = 105% ??

  12. Notes: • 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)

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