ELE –501 Control Systems Engg-II

Introduction:The Control System, The basic elements of a servomechanism, Types of servomechanism, Development of Automatic Control.

Mathematical Model:Mathematical representation of physical system, Electrical mechanical system, liquid level system, Transfer function and impulse response of linear system, Block diagram, Signal flow graphs, Application of signal flow graphs for gain formula to block diagram.

Control System Components: Potentiometers, Synchros, L.V.D.T., Modulators and demodulators, A.C. Servomotors, D.C. & A.C. Tachogenerator, Mathematical modeling of D.C. Motors, Examples of Closed loop Systems using D.C. & A.C. Servomotors, Synchros, Tachogenerators etc.

Hydraulic Systems and Pneumatic Systems: Pump controlled & Valve controlled Hydraulic motor & Actuators, Hydraulic Valve, Hydraulic Controllers & Pneumatic Controllers.

General Feedback Theory: Feedback, The effect of Feedback, Mathematical definition of feedback.

Time response of feedback control systems: Typical Test signal for the transient analysis, time domain performance characteristics of feedback control systems, transient response, transient response of 2nd order systems, transient response of 2nd order systems, transient response of a positional servomechanism, Effects of derivative and integral controls on the transient performance, P.I., P.D. Controllers, Tachometer Feedback, Steady State response, Steady State error, generalized error analysis, Stability of linear control systems, The Routh-Hurwitz criterion.

The Frequency response method: Bode’s Plot, Magnitude versus Phase shift Plot, frequency response of feedback control system, Frequency domain specification, MP and WP for a second order system.

The Nyquist Criterion and Stability: Introduction, The Principle of argument and Nyquist Path, Nyquist criterion and GH plot, The application of Nyquist Criterion, The effect of additional poles and zeros of G(s)H(s) on the shape of Nyquist locus, Relative Stability, gain margin, phase margin, conditionally stable systems.

The Root Locus Technique: Introduction, Root Loci, Construction of the root loci, some other properties of the root locus, Root locus of conditionally stable systems.

State variable analysis: Introduction, concept of state, state variable and state model, state equations of continuous data system, Derivation of state model from transfer functions and vice-versa. Diagnolisation, solution of state equation.

TEXTBOOKS

1. Control Systems Engineering by NagrathGopal:

2. Modern Control Engineering, by K.Ogata, PHI

3. Automatic Control Systems, by B.C. Kuo, PHI

4. Feedback Control Systems analysis and synthesis by J. Diazzo and C.F. Houpis,.

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