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What is the difference between feedback control feed forward control and concurrent control?
Wiki User
∙ 11y ago
1) Use ONLY feedforward control if:
- The physics/chemistry of the application are well known
- You can easily measure or calculate the variables in the equations
- There are no significant process disturbances
- The accuracy of the measurements used is an order of magnitude better than the application specifications
2) Use ONLY feedback control if:
- Significant un-modeled process disturbances exist
- You cannot measure or calculate variables in the equations describing the physics/chemistry of the application.
- The accuracy of the measurements used is NOT an order of magnitude better than the application specifications.
3) Use both when:
- The physics/chemistry of the application are well known
- You can easily measure or calculate the variables in the equations
- The accuracy of the measurements used is on the order of the application specifications
- You want to prevent saturation of the controller integrators
- You want to improve trajectory tracking, but 2nd and higher order dynamics in the plant limit your controller bandwidth
Wiki User
∙ 11y ago
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