The subject Theory of Machines may be defined as that branch of Engineering-science, which deals with the study of relative motion between the various parts of a machine, and forces which act on them. The knowledge of this Mechanical subject is very essential for an engineer in designing the various parts of a machine.
It is that branch of scientific analysis which deals with motion, time and force.
is the study of motion, without considering the forces which produce that motion. Kinematics of machines deals with the study of the relative motion of machine parts. It involves the study of position, displacement, velocity and acceleration of machine parts.
of machines involves the study of forces acting on the machine parts and the motions resulting from these forces.
A body has plane motion, if all its points move in planes which are parallel to some reference plane. A body with plane motion will have only three degrees of freedom. I.e., linear along two axes parallel to the reference plane and rotational/angular about the axis perpendicular to the reference plane. (eg. linear along X and Z and rotational about Y.)The reference plane is called plane of motion. Plane motion can be of three types. 1) Translation 2) rotation and 3) combination of translation and rotation.
Kinematic link (or) element
A machine part or a component of a mechanism is called a kinematic link or simply a link. A link is assumed to be completely rigid, or under the action of forces it does not suffer any deformation, signifying that the distance between any two points on it remains constant. Although all real machine parts are flexible to some degree, it is common practice to assume that deflections are negligible and parts are rigid when analyzing a machine’s kinematic performance.
Theory of Machine Topics
- Kinematics of Motion
- Kinetics of Motion
- Simple Harmonic Motion
- Simple Mechanisms
- Velocity in Mechanisms (Instantaneous Centre Method)
- Velocity in Mechanisms (Relative Velocity Method )
- Acceleration in mechanisms
- Mechanisms with lower pairs
- Belt rope and Chain drives
- Toothed gearing
- Gear trains
- Gyroscope Couple and Precessional Motion
- Inertia force in Reciprocating Parts
- Turning moment and Flywheel
- Steam Engines valve and Reversing Gears Mechanism
- Brakes and Dynamometers
- Balancing of rotating masses
- Balancing of reciprocating masses
- Longitudinal and Transverse vibrations
- Torsional Vibrations
- Computer Analysis and Synthesis of Mechanism
- Automatic Control
Reference books for Theory of Machine
Theory of Machine by RS Khurmi – eBook – textbook
Theory of Machine by SS Ratan – eBook – textbook
Theory of Machine by Thomas Bevan – eBook – textbook
Theory Of Machine And Mechanisms by UICKER, PENNOCK, SHIGLEY – eBook – textbook
PPT for Theory of Machine