EC1304 CONTROL SYSTEMS 3 1 0 100

AIM

To familiarize the students with concepts related to the operation analysis and stabilization of control systems

OBJECTIVES

• To understand the open loop and closed loop (feedback ) systems

• To understand time domain and frequency domain analysis of control systems required for stability analysis.

• To understand the compensation technique that can be used to stabilize control systems

UNIT I CONTROL SYSTEM MODELLING 9

System concept, differential equations and transfer functions. Modelling of electric systems, translational and rotational mechanical systems, Simple electromechanical systems.

Block diagram representation of systems –

Block diagram reduction methods – Closed loop transfer function, determination of signal flow graph. Mason’s gain formula – Examples.

UNIT II TIME DOMAIN ANALYSIS 9

Test signals – time response of first order and second order systems – time domain specifications – types and order of systems – generalised error co-efficients – steady state errors – concepts of stability – Routh-Hurwitz stability – root locus.

UNIT III FREQUENCY DOMAIN ANALYSIS 9

Introduction – correlation between time and frequency response – stability analysis using Bode plots, Polar plots, Nichols chart and Nyquist stability criterion – Gain margin – phase margin.

UNIT IV COMPENSATORS 9

Realization of basic compensators – cascade compensation in time domain and frequency domain and feedback compensation – design of lag, lead, lag-lead compensator using Bode plot and Root locus. Introduction to P, PI and PID controllers.

UNIT V CONTROL SYSTEM COMPONENTS AND APPLICATION OF CONTROL SYSTEMS 9

Stepper motors – AC servo motor – DC servo motor – Synchros – sensors and encoders – DC tacho generator – AC tacho generator – Hydraulic controller – Pneumatic controller – Typical application of control system in industry.

TUTORIAL 15

TOTAL : 60

TEXT BOOKS

1. Ogata.K, Modern Control Engineering, Prentice Hall of India, 4th Edition, 2003 (UNIT I – IV)

2. Nagrath & Gopal, Control System Engineering, 3rd Edition, New Age International Edition, 2002. (UNIT V)

REFERENCES

1. Benjamin.C.Kuo, Automatic Control Systems, 7th Edition – Prentice Hall of India, 2002.

2. M.Gopal, Control Systems, Tata McGraw-Hill, 1997

AIM

To familiarize the students with concepts related to the operation analysis and stabilization of control systems

OBJECTIVES

• To understand the open loop and closed loop (feedback ) systems

• To understand time domain and frequency domain analysis of control systems required for stability analysis.

• To understand the compensation technique that can be used to stabilize control systems

UNIT I CONTROL SYSTEM MODELLING 9

System concept, differential equations and transfer functions. Modelling of electric systems, translational and rotational mechanical systems, Simple electromechanical systems.

Block diagram representation of systems –

Block diagram reduction methods – Closed loop transfer function, determination of signal flow graph. Mason’s gain formula – Examples.

UNIT II TIME DOMAIN ANALYSIS 9

Test signals – time response of first order and second order systems – time domain specifications – types and order of systems – generalised error co-efficients – steady state errors – concepts of stability – Routh-Hurwitz stability – root locus.

UNIT III FREQUENCY DOMAIN ANALYSIS 9

Introduction – correlation between time and frequency response – stability analysis using Bode plots, Polar plots, Nichols chart and Nyquist stability criterion – Gain margin – phase margin.

UNIT IV COMPENSATORS 9

Realization of basic compensators – cascade compensation in time domain and frequency domain and feedback compensation – design of lag, lead, lag-lead compensator using Bode plot and Root locus. Introduction to P, PI and PID controllers.

UNIT V CONTROL SYSTEM COMPONENTS AND APPLICATION OF CONTROL SYSTEMS 9

Stepper motors – AC servo motor – DC servo motor – Synchros – sensors and encoders – DC tacho generator – AC tacho generator – Hydraulic controller – Pneumatic controller – Typical application of control system in industry.

TUTORIAL 15

TOTAL : 60

TEXT BOOKS

1. Ogata.K, Modern Control Engineering, Prentice Hall of India, 4th Edition, 2003 (UNIT I – IV)

2. Nagrath & Gopal, Control System Engineering, 3rd Edition, New Age International Edition, 2002. (UNIT V)

REFERENCES

1. Benjamin.C.Kuo, Automatic Control Systems, 7th Edition – Prentice Hall of India, 2002.

2. M.Gopal, Control Systems, Tata McGraw-Hill, 1997

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