Open Loop System:
Advantages:
Simplicity and stability: they are simpler in their layout and hence are
economical and stable too due to their simplicity.
Construction: Since these are having a simple layout so are easier to
construct.
Disadvantages:
Accuracy and Reliability: since these systems do not have a feedback
mechanism, so they are very inaccurate in terms of result output and hence they
are unreliable too.
Due to
the absence of a feedback mechanism, they are unable to remove the disturbances
occurring from external sources.
Closed Loop System:
Advantages:
Accuracy: They are more accurate than open loop system due to their
complex construction. They are equally accurate and are not disturbed in the
presence of non-linearities.
Noise
reduction ability: Since they are composed of a feedback mechanism, so they
clear out the errors between input and output signals, and hence remain
unaffected to the external noise sources.
Disadvantages:
Construction: They are relatively more complex in construction and hence
it adds up to the cost making it costlier than open loop system.
Since
it consists of feedback loop, it may create oscillatory response of the system
and it also reduces the overall gain of the system.
Stability: It is less stable than open loop system but this disadvantage
can be striked off since we can make the sensitivity of the system very small
so as to make the system as stable as possible.
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