Important Observations on Feed-forward Control
- For an efficient filter, the system should remain stationary. Any unknown delay in the system could destabilize the performance.
- Since a successful filter has to match the gain and phase contributions by the disturbance signal at all the frequencies present in the signal, the disturbance should be free from near-field noises, which are difficult to estimate.
- For a system having random disturbance one may attempt to develop a similar feed-forward compensator – however, such a system would be non-causal in nature, hence a purely feed-forward system should be substituted by a combination of feed-forward and feed-back system.
Summary of the Lecture
- The simplest of the SISO system based on Classical Control is discussed.
- A typical SDOF system and it's SISO representation is considered. .
- A quick recapitulation of the classical control system is discussed.
- Finally, the case of Feed-forward control and its impact is discussed.
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Congratulations! You have finished Lecture 23.
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