CLOSED-LOOP CONTROL SYSTEM

CLOSED-LOOP-

in a closed-loop control system the output has an effect on control action through a feedback and hence closed-loop control system are also termed
as feedback control system. 

The control system without involving human intervention for operation are
called automatic control system.

A closed-loop control system using a power amplifying device prior to controller and the output of such a system being mechanical.

Ex. Position, velocity, acceleration is called servomechanism.

• The closed-loop systems is complicated to construct and costly.

• The closed-loop  system  can  become  unstable under  certain conditions.

In terms of the performance the closed-loop system adjusts to the effects of non-linearities present in its elements.

                                       

                                           

                                                              closed-loop control system

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OPEN-LOOP CONTROL SYSTEM

OPEN-LOOP -

In an open-loop controls system the input is neither measured nor feedback for comparison with the input. Faithfulness of an open-loop control system depends on the accuracy of input calibration.

• The open-loop system is simple to construct and cheap.

• The open-loop system are generally stable.

The operation of open-loop system is affected due to the presence of
 non-linearities in its elements.

          

                 

                             

            

                                       

                                                   Diagram of open-loop control system.

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