WITH EFFECT FROM THE ACADEMIC YEAR 2016 - 2017
EC304
AUTOMATIC CONTROL SYSTEMS
Instructions 4 Periods per week
Duration of University Examination 3 Hours
University Examination 75 Marks
Sessional 25 Marks
UNIT – I
Control System fundamentals and Components : Classification of control systems including Open and Closed loop systems, Error sensing devices – potentiometers and Synchros. Mathematical modeling of mechanical systems and their conversion into electrical systems. Block diagram representation, Block diagram algebra and reduction and Signal flow graphs and Mason’s gain formula.
UNIT – II
Time Response : Transfer function and Impulse response, types of input. Transient response of second order system for step input. Time domain specifications. Characteristic Equation of Feedback control systems Types of systems, static error coefficients, error series,
Stability : Concept of Stability, Routh-Hurwitz criterion for stability, Root locus technique and its construction.
UNIT – III
Frequency response plots : Bode plots, frequency domain specifications. Gain and Phase margin. Principle of argument. Nyquist plot and Nyquist criterion for stability.
Compensation : Cascade and feedback compensation. Phase lag, lead and lad-lead compensators. PID controller.
UNIT – IV
Discrete Control Systems : Digital control, advantages and disadvantages, Digital control system architecture. The discrete transfer function. Sampled data system. Transfer function of sample data systems. Analysis of Discrete data systems.
UNIT – V
State space representation : Concept of state and state variables. State models of liner time invariant systems, State transition matrix, Solution of state equations. Controllability and Observability.
Suggested Reading:
- 1.Nagrath, I.J, and Gopal, M., “Control System Engineering”, New Age Publishers.
- 2.
- 3.Gopal, Madam, “Digital control Engineering” New Age Publishers.