Introduction To Kinematics Of Machine

Background:

Kinematics of machine is a branch of mechanical science that deals with machine constitution. In general, kinematics of machines is broadly classified in to theoretical approach and practical approach. Theoretical approach refers to kinematics of machine. The applied part of mechanical science forms the basis for the kinematic study of science. It involves geometry analysis of motion. Kinematic analysis of machines has a vital role in machine designing and mechanism designing.

Kinematic machine design is used for analyzing various positions on the solid body and time derivative measurement of the respective position. Foremost position derivation in conjunction with time is referred as velocity whereas the second derivation of position with respect to time is referred as acceleration. The consecutive derivatives of position can be experimented depending on the machine design and mechanism design requirements. The kinematic analysis of angular motion derivatives are referred as angular velocity and angular acceleration.

Kinematic mechanism:

A simple example to understand the kinematic of machine is scissors. Scissors has two levers and the levers are connected together by a joint. In specific, joint is of revolute joint. When an input is provided at one end, the cutting action occurs at the other end. Another complex instance of machine kinematics is slider crank shaft system mechanism. Here rigid parts are assembled with the help of joints. Input at one point is transferred in to output at the point of actuation.

Kinematic joints:

Joints in kinematics of machine are referred as kinematic joints. The contact between machine components shall be line contact, point contact and or area joint. Based on contact type they are of two types namely

• Lower pair kinematic joint: For instance revolute, hinge and slider
• Higher pair kinematic joint: For instance cam pair and cam follower.

Questions:

• What are the types of kinematic joints?
• What is the kinematic mechanism of machine?
• How kinematic study helps in geometry and motion prediction?
• What are the outline theories of machines?