Concept of automatic controls, open and closed loop systems, concepts of feedback, requirement of an ideal control system. Types of controllers– Proportional, Integral, Proportional Integral, Proportional Integral Differential controllers.
Transfer function models, models of mechanical systems, models of electrical circuits, DC and AC motors in control systems, models of thermal systems, models of hydraulic systems. Pneumatic system. Analogous systems: Force voltage, Force current.
Transfer Functions definition, function, block representation of system elements, reduction of block diagrams, Signal flow graphs: Mason’s gain formula.
Introduction, first order and second order system response to step, ramp and impulse inputs, concepts of time constant and its importance in speed of response. System stability: Routh’s-Hurwitz Criterion.
Polar plots, Nyquist Stability Criterion, Stability Analysis, Relative stability concepts, phase and gain margin, M & N circles.
Bode attenuation diagrams, Stability Analysis using Bode plots, Simplified Bode Diagrams.
Definition of root loci, general rules for constructing root loci, Analysis using root locus plots.
Series and feedback compensation, Physical devices for system compensation.