文档介绍：理论力学 Theoretical Mechanics
运动学第七章点的合成运动
力学教研室
Composite Motion of a Point PART A Concepts
Composite Motion of a Point
PART A Absolute Motion, Relative Motion and Convected Motion
Real sample
Object of Study:
Method
particle
The Method which use two different Motions is applied to describe plex motion– Method posite Motion
Composite motion– Running of Bicycle
Composite motion– Lathe
Composite Motion of a Point
Absolute Motion, Relative Motion and Convected Motion
What do we want to know
What do we want to study?
1 Simplify plex motion to two simple motions, compute the unknowns of simple motion, bine the results to plex motion’s unknowns.
2 Discuss the Relationship of the Value of kinematics in the framework (结构).
Sample
3 Study the relationship between two moving bodies, which has no directly connection with each other.
Composite Motion of a Point
Absolute Motion, Relative Motion and Convected Motion
Moving point
Moving Point (动点)
The descriptions of the motion of a point are different to different reference frame (参考系)
Static Reference Frame (静参考系)
Fixed on the earth, usually be written as Oxy.
Dynamic Reference Frame (动参考系)
Fixed on the moving body, usually be written as O’x’y’.
Composite Motion of a Point
Absolute Motion, Relative Motion and Convected Motion
Three kind of motion
Absolute Motion (绝对运动)
The motion of the moving point relative