Introduction to control problem
Control examples. Transfer function models of mechanical, electrical,
thermal and hydraulic systems. System with dead-time. System response.
Control hardware and their models: potentiometers, synchros, LVDT,
dc and ac servomotors, tachogenerators, electro hydraulic valves,
hydraulic servomotors, electropeumatic valves, pneumatic actuators.
Closed-loop systems. Block diagram and signal flow graph analysis,
characteristics of feedback control systems
steady-state accuracy, transient accuracy, disturbance rejection,
insensitivity and robustness. Basic modes of feedback control:
proportional, integral and derivative. Feed-forward and multi-loop
control configurations, stability concept, relative stability,
Routh stability criterion.
of second-order systems, steady-state errors and error constants.
Performance specifications in time-domain. Root locus method of
design. Lead and lag compensation.
between time & frequency response, Polar plots, Bode’s
plot, stability in frequency domain, Nyquist plots. Nyquist stability
criterion. Performance specifications in frequency-domain. Frequency-domain
methods of design, Compensation & their realization in time
& frequency domain. Lead and Lag compensation.
and digital implementation of compensators. Tuning of process
controllers. State variable formulation and solution.
state, state variable, state model, state models for linear continuous
time functions, diagonalization of transfer function, solution
of state equations, concept of controllability & observability.
to Optimal control & Nonlinear control
problem, Regulator problem, Output regulator, treking problem.
Nonlinear system – Basic concept & analysis.
Suggested Text Books & References
• Gopal. M., “Control Systems: Principles and Design”,
Tata McGraw-Hill, 1997.
• Kuo, B.C., “Automatic Control System”, Prentice
Hall, sixth edition, 1993.
• Ogata, K., “Modern Control Engineering”, Prentice
Hall, second edition, 1991.
• Nagrath & Gopal, “Modern Control Engineering”,
New Ages International.
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