what is the difference between Feedback controller and Feed
forward controller. and when it is to be used.
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Answer Posted / muslim
feedback controller: to monitor the controlled variables
(pressure, temperature,..) and feedback the measured value
to the controller to be compared with set point within the
controller , and finally to give corrective signal used to
stabilize the control loop.
feedforward controller: to monitor all loads that influence
the process.
theoritically we have to monitor all loads, but practically
it's impossible .. as there's unmeasured disturbances (like
pipe fitting leaks, composition change ,..) that can't be
predicted.
so if we are to make a complete feedforward control so we
have no feedback mechanism and so we will have a non
disturbed process, which is impracticale.
practically we have feedforward in conjunction with
feedback control , which enhance the loop stability.
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