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This is the project i'm working on and i'm struggling to understand one sentence which is stopping me from progressing the project. enter image description here

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I'm struggling to understand what it means when it says to add +/- 80% step changes in Qh to represent process disturbances.

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    $\begingroup$ I guess it means make a step change from $Q_h$ to $1.8Q_h$ or $0.2Q_h$ and show what the controller does. $\endgroup$
    – alephzero
    Commented May 11, 2021 at 11:45
  • $\begingroup$ Without reading everything, my take is if the process deviates +/- some level of steady state, you are only to correct it by +/- 80% of that deviation. Example, If Qh increases my +80 flow units, then maintain H2 by increasing Qc by, 80% * Qc, flow units (or perhaps by 64 (80% * 80) flow units). $\endgroup$
    – Jim Clark
    Commented May 12, 2021 at 11:13

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