INTRODUCTION OF THEORY OF MACHINES AND MECHANISM :
Rapid advances in technology have somewhere increased a keen interest in the minds of Engineers to cover that field of Engineering theory, analysis, design and practice that, which is generally described as mechanism or as kinetics and dynamics of machines.
Theory of Machine, a branch of mechanics which tackles the concept and phenomenon of the rigid bodies. This part of study of mechanics is generally used to understand the relationship between the geometry and motion of the parts of a machine or mechanism, and the forces that produce these motion. This subject, naturally confines itself into three broad field as:
- Mechanism and kinematics of mechanism.
- Methods of designing mechanism.
- Kinetics, the time varrying forces in machines and the resulting dynamic phenomenon.
The beauty of this subject lies in the graphical analysis of the fundamental laws of mechanics.
Learning “nature of mechanism as it is”, is what the concern of this subject.
The design of modern machines are very complex. Thus it has become very much important to learn the phenomena and the concept behind the design by analysing its mechanism. Suppose in the design of a new engine the automotive engineer must deal with many interrelated questions. what is the relationship between the motion of the piston and the motion of the crankshaft?
What are the sliding velocities and the loads at the lubricated surfaces, and what lubricants are available for this purpose? Likewise many questions arises while designing any mechanical component. although all these and many other important questions must be answered before the design is completed and it becomes obvious that there should be a branch which deals by analysing and synthesizing all the mechanism related to the machines.
Design and analysis are two different aspect of the study of mechanical system. Design is the process of prescribing the sizes, shapes, material composition and arrangement of parts so that the resulting machine will perform the prescribed task. Thus, analysis is required which are the techniques that allow the designer to critically examine an already existing or proposed design to judge its suitability for the task.