BASIC ON CONTROL SYSTEM

Control systems in general are classified as open loop and closed loop.

Open loop control system is those system which gives output dependent on present input, it does not interpret past inputs. good example is Electric Fan.

Electric Fan:

Suppose we are sitting in room in summer season and unfortunately speed of fan is slow enough to get lot of sweat, now you pray to god that please increase speed of fan but speed will remain slow until you go and increase it. now to increase speed of fan you required to change input voltage such system is good example for Open loop system.

Closed loop systems are probably an intelligent systems which can be controlled from present conditions also from past conditions.Good example is Refrigerator,Air conditioner.

Suppose you are sitting in room in summer season unlike fans AC sense temperature and respectively adjust its temperature (If environment conditions are hot then AC will try to keep room at lower temperature finally ! God had listen us and reduce temperature as needed in Summer season.)


Basic aspect of Control system:

• To control response of system.(Transient analysis)
• To obtain stable system.(Stability analysis)
• To obtain Response of system.(Root locus, Bode plot, Nyquist plot)
• To compensate various factor that affect response of system.(Compensation)

All this are central aspect of control system design. so  i will address each on in clear and lucid way.