EE 503-CONTROL SYSTEMS-I |
Introduction to control system: |
Concept of feedback and Automatic Control, Effects of feedback, Objectives of control systems. Definition
of linear and nonlinear systems. Elementary concepts of sensitivity and robustness. Types of control
systems: Servomechanisms and regulators, examples of feedback control systems.
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Mathematical modeling of dynamic systems: |
Electrical analogy of spring-mass-dashpot system. Transfer Function concepts, poles and zeroes of a
transfer function. Block diagram representation of Control Systems. Block Diagram Algebra Signal Flow
Graph. Mason’s gain formula. |
Control system component: |
Potentiometer, synchros, resolvers, position encoders, D.C. and A.C. tacho-generators, actuators. Block
diagram level description of feedback control systems for position control, speed control of DC motors,
temperature control, liquid level control, voltage control of an alternator.
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Time domain analysis: |
Time domain analysis of a standard second order closed loop system. Concepts of undamped natural
frequency, damping, overshoot, rise time and settling time. Dependence of time domain performance
parameters on natural frequency and damping ratio. Step and impulse response of first and second order
systems. Effects of poles and zeroes on transient response. Stability of linear system by pole location.
Routh-Hurwitz criteria.
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Error analysis: |
Steady state errors in control systems due to step, ramp and parabolic inputs. Concept of system types and
error constants. |
Stability analysis: |
Root locus techniques, Construction of Root Loci for simple systems. effects of gain on the movement of
poles and zeros.
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Frequency domain analysis of linear systems : |
Bode plots, Polar Plots, Nichols chart. Concept of resonance frequency of peak magnification.
Nyquist criteria, measures of relative stability – phase and gain margins. Determining margins in Bode
Plots and Nichols chart, M-circle and M-Contours in Nichols chart. |
Control system performance measures: |
Improvement of system performance through compensation, Lead, lag and lead-lag compensation , PI, PD
and PID control.
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Text Books: |
1. Ogata, K : Modern Control Engineering, 4e, Pearson Education.
2. Nagrath I. J& Gopal, M: Control Systems Engineering, New Age International publication.
3. Roy Choudhury, D., Control system Engineering, PHI
4. Kuo, B.C. Automatic Control System, PHI
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Reference Books: |
1. Control Systems (TMH WBUT Series), Purkait, Satpati, Mondal & Mallik,TMH
2. Bandyopadhyaya, Control Engineering Theory and Practice, PHI
3. Nise, Norman S, Control System Engineering, 3rd Edition, John Wiley & Sons.
4. Dorf R C & Bishop R.H., Modern Control System, 11e : Pearson Education
5. Graham C Goodwin, Stefan F. Graebe, Mario E. Salgado, Control System Design, PHI
6. Macia & Thaler, Modeling & Control of dynamic system. Thompson.
7. Christopher T. Kilian, Modern Control Technology Components & Systems. 3e, Cengage Learning.
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