what is the difference between Feedback controller and Feed
forward controller. and when it is to be used.
- 3 Answers
- 30374 Views
- I also Faced
- E-Mail Answers
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.
| Is This Answer Correct ? | 15 Yes | 3 No |
Post New Answer View All Answers
What is Erosion in a control valve?
I have a Control VAlve having size of 2 ".Only the known parameter is Pressure drop . Its 2 Kg. Then How to calculate control valve sizing means Cv.
What are continuances of connecting earthing and shield of branch cables (instrument to Junction box), at the same earthing pot provided on JB? Is it ok, or may produce some problem?
hi,i am doing 3 year in electronic and instrumentation engineering. what type of aptitude questions will be asked in a core industries and how can i improve my skills in instrumentation?
What is defferent betwen ESP &PCP PUMP .HOW IT IS WORK?
Tr. Wiring for calibration.
For crude application in floating roof tank, how to calibrate a DP Transmitter? How is the floating roof weight considered?
OBJECTIVE TYPE QUESTIONS OF ANALYTICAL INSTRUMENTATION
In control valve proximity inductive sensor is taken as digital feedback for full open and full close.Normally its volts 24v when the sensor acts the feed back voltage 14v so that our relay not indicating in plc panel . kindly give the solution.
How a conductivity sensor & analyzer work at boiler, whats the principle & science is beyond this,How conductivity sensor sence & convert signal & move toward analyzer & analyzer show reading in percent? also what is temperature compensate option in conductivity analyzer
How is PH sensor works ?
how 3 out of 2 Logic/interlocks works? give brief explanation with help of diagram.
hey any one got the papers of SAIL and HPCL plz do help me by posting them to my mail ID's naren07_87@yaho.co.in, surenarendra@gmail.com
when placing a vent or drain hole on an orifice plate should you measure from the center of the bore up or down for the vent placement?
Calibration procedure for water rotameters
