Control System and Automation

Course Topics

  • Classification of Control Systems
  • Concept and Effects of feedback
  • Linear and Non linear systems
  • Types of mechanical Translational systems
  • Electrical Analogies of an Mechanical Systems
  • Block Diagram
  • Block Diagram - Algebra
  • Block diagram - Reduction
  • Signal Flow Graph
  • Mason's gain Formula - with problems
  • Time response Analysis
  • Time domain specifications
  • Steady State Error
  • Stability
  • Routh Hurwitz stability criterion
  • Frequency response analysis


In control system and automation we are going to acquire the knowledge  about automation and control engineering in ships.


A control system is a system, which provides the desired response by controlling the output. The following figure shows the simple block diagram of a control system.



Here, the control system is represented by a single block. Since, the output is controlled by varying input, the control system got this name. We will vary this input with some mechanism. In the next section on open loop and closed loop control systems, we will study in detail about the blocks inside the control system and how to vary this input in order to get the desired response.

Examples − Traffic lights control system, washing machine

Traffic lights control system is an example of control system. Here, a sequence of input signal is applied to this control system and the output is one of the three lights that will be on for some duration of time. During this time, the other two lights will be off. Based on the traffic study at a particular junction, the on and off times of the lights can be determined. Accordingly, the input signal controls the output. So, the traffic lights control system operates on time basis.