Sr. no Point of Difference Feedback control system Feed Forward Control system 1 Definition Systems in which corrective action is taken after disturbances affect the output Systems in which corrective action is taken before disturbances affect the output 2 Necessary requirement Not required Measurable Disturbance or noise 3 Corrective action Corrective action taken after the disturbance occurs on the output. Corrective action taken before the actual disturbance occurs on the output. 4 Block Diagram enter image description here enter image description here 5 Control Variable adjustment Variables are adjusted depending on errors. Variables are adjusted based on prior knowledge and predictions. 6 Example Use of roll sensor as feedback element in ship stabilization system. Use of flowmeter as feed forward block in temperature control systems.:
- Definition
- Systems in which corrective action is taken after disturbances affect the output
- Systems in which corrective action is taken before disturbances affect the output
- Necessary requirement
Not required
Measurable Disturbance or noise
- Corrective action
Corrective action taken after the disturbance occurs on the output.
Corrective action taken before the actual disturbance occurs on the output.
- Block Diagram
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enter image description here
- Control Variable adjustment
- Variables are adjusted depending on errors.
- Variables are adjusted based on prior knowledge and predictions.
- Example
- Use of roll sensor as feedback element in ship stabilization system.
- Use of flowmeter as feed forward block in temperature control systems.
