control system

1. CONTROL SYSTEMS
Introduction Class
• Team of Instructors
Haripriya
Madhuri Bayya
1

2. Destination point
Starting Point
Prescribed path

3. Definition of control System
• It consists of subsystems and processes
assembled for the purpose of controlling the
outputs.
• For example in a furnace fuel valves, fuel valve
actuators and thermostats acts as subsystems
3

4. Uncontrolled System Example
• Nuclear fission reaction:
• It occurs when a nucleus of a heavy atom
captures a neutron.
4

5. Controlled system Example
• Control rods are used in nuclear reactors to
control the fission rate.
5

6. Open loop Control System
6
Nuclear
reaction
Desired
power
output
10 MW
Actual
power
output
8 MW

7. Closed loop Control System
7
Nuclear
reaction
Desired
power
output
10 MW
Actual power
output
8 MW
Error acts
as input

8. Some examples of control systems
• Temperature
• Liquid Level
• Speed

9. Manual
feedback control
of
a thermal system

10. Steam
Drain
Thermometer
R
Hot
water
Cold
water

11. Automatic
feedback control
of
a thermal system

12. R
Steam
Control
valve
Automatic
controller
Temperature
measuring device
Hot
water
Drain
Cold
water

13. Liquid - level
control system

14. ---------------------
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Controller
Pneumatic
valve
Inflow
Outflow

15. 15
Speed Control examples
Fig.8 Open Loop Control of a turntable Fig.9 Closed Loop Control of a turntable

16. Applications
• Control Engineering
– Foundations from feedback theory
– Aeronautical, civil, Mechanical, Electrical,
Chemical, Environmental
– Not limited to any engineering disciplines
16

17. Applications
17

18. 18

19. 19

20. 20

21. 21

22. • Control systems are found in all sectors of
industry
– Quality control of manufactured products
– Automatic assembly line
– Machine-tool control
– Space technology and weapon systems
– Robotics
– Computer control
– Transportation systems
– Power systems
– And many others
22

23. Handout discussion
• Modeling of physical system
• Time domain analysis
• Frequency domain analysis

24. Text books:
• Main text book:
– Nagrath I. J. and M. Gopal, Control Systems
Engineering, New Age International (P)
Limited, 5thed, 2007.
• Reference Text book:
– Kuo, B. C., and Golnaraghi, F., Automatic
Control Systems,John Wiley & Sons, 8thed,
2003.
– Dorf, R. C., and Bishop, R. H., Modern
Control Systems, Addison Wesley, 7thed,
1995.

25. Evaluation
Component Duration Weightage
(%)
Marks Remarks
Test I 60 min 20 60 CB
Test II 60 min 20 60 CB
Assignments - 20 60 OB
Comprehensiv
e Exam.
3 hours 40 120 CB