UNIT I SYSTEMS AND THEIR REPRESENTATION
Basic elements in control systems – Open and closed loop systems – Electrical analogy of
Mechanical and thermal systems – Transfer function – Synchros – AC and DC
servomotors –Block diagram reduction techniques – Signal flow graphs.
UNIT II TIME RESPONSE
Time response – Time domain specifications – Types of test input – I and II order
system response – Error coefficients – Generalized error series – Steady state error – P,
PI, PID modes of feedback control.
UNIT III FREQUENCY RESPONSE
Frequency response – Bode plot – Polar plot – Determination of closed loop response
from open loop response – Correlation between frequency domain and time domain
UNIT IV STABILITY OF CONTROL SYSTEM
Characteristics equation – Location of roots in S plane for stability – Routh Hurwitz
criterion– Root locus construction – Effect of pole, zero addition – Gain margin and
phase margin –Nyquist stability criterion.
UNIT V COMPENSATOR DESIGN
Performance criteria – Lag, lead and lag-lead networks – Compensator design using