CHEN 4601 Lecture Notes - Lecture 43: Fot, Fast Fourier Transform, If And Only If

• School: UMN
• Department: Chemical Engineering
• Course: CHEN 4601
• Professor: Prodromos Daoutidious

Document Summary

Sp compensator this is feedforward but can"t just rely on that. Use ff to compensate for any measurable disturbances (if you can measure it, good idea to compensate for it) Use fb to account for unmeasured disturbances and changes in set point. Gp and gd are stable closed-loop response is: stability will be guaranteed iff and. Q1 and q2 parts need to be stable, so they have to follow that form. Exactly the same as in the pure ff case with q1 = gsp and q2 = gff. The formulas for the optimal q1 and q2 are the same as the ones for gsp and gff: for step changes in ysp --> Then, the optimal gc and gff are obtained by substituting these to and. If the process is minimum-phase => then that means. -> perfect control, that is the theoretical limit --> but not realizable in practice. In practice, find , which is proper approximation of q1min.