Control System

Control System Concepts: Elements of control systems, concept of open loop and closed loop systems, Examples and application of open loop and closed loop systems, Mathematical Modelling of Physical Systems (Electro Mechanical), Determination of transfer function by block diagram reduction techniques and signal flow method using Mason’s gain formula, Basic Characteristics of negative feedback control systems. Control System Components: Constructional and working concept of AC & DC servomotor, synchro’s, stepper motor and tachometer.

Time Response Analysis: Standard test signals, time response analysis of first and second order systems, time response specifications of second order system for unit step input, location of roots of characteristics equation and corresponding time response, steady state errors and error constants. Basic modes of feedback control: Proportional, Derivative, Integral and PID controllers, controller design using Ziegler Nichols.

Stability and Algebraic Criteria: Concept of stability and its necessary conditions, Routh-Hurwitz criteria and its limitations. Root Locus Technique: Salient features of root locus plot, Procedure for plotting root locus, root contours.

Frequency Response Analysis: Frequency Response analysis from transfer function model, Construction of polar and inverse polar plots. Stability in Frequency Domain: Nyquist stability criterion, Determination of gain and phase margin from Bode & Nyquist Plots, Correlation between time and Frequency Responses.

Introduction to Design: The design problems and preliminary considerations of lead, lag and lead-lag compensation networks, design of closed loop systems using compensation techniques in time and frequency domains. State Space Technique: Concept of single input and multiple input and multiple output system, State-space model of physical system, conversion of state-space to transfer function model and vice-versa, State transition matrix, Concept of controllability and observability and their testing.