Feedback Control Systems syllabus

Basic concept of control system, classification of control systems: Open Loop and Closed Control System, Transfer Function, concept of pole and zero, Modelling of Electrical and Mechanical systems using differential equations and transfer function, analogy between electrical and mechanical systems, Block diagram algebra, Signal Flow Graph: Mason’s gain formula.

Standard test signals: step, ramp, parabolic and impulse signal, type and order of control system, Concept of transient and steady state response, time response of first and second order systems to unit impulse, unit step input, time domain specifications of second order systems, derivation of time domain specifications, steady state error and static error coefficients.

Concept of stability: BIBO, nature of system response for various locations of poles in S-plane, Routh’s-Hurwithz criterion. Root Locus: Angle and magnitude condition, Basic properties of root locus. Construction of root locus, Stability analysis using root locus.

Introduction to Frequency domain specifications, Polar Plot, Introduction to Bode plot, Asymptotic approximation: sketching of Bode plot, stability analysis using Bode plot.

Process Characteristics: Process equation, capacity, self – regulation, disturbances, control lag, process lag, distance/velocity lag (dead time). Control actions (ON-OFF, proportional, integral, derivative, proportional plus integral, proportional plus derivative, proportional plus integral plus derivative, Controller tuning by Ziegler-Nichols methods, Cohen Coon tuning method.