10.6. Feed-Forward Control
When a disturbance affects a process under feedback control it is necessary for a measured process output to change before corrective action is taken to change the manipulated input. It would be preferable to have a sensor that measures the disturbance and adjusts the manipulated input before the process output changes. Consider the furnace system studied earlier in this chapter and shown in Figure 10-11. One possible disturbance is the process fluid flow rate; if the flow rate increases 20%, then the required heat duty should also increase by 20%. The purpose of the feed-forward control strategy shown is to immediately change the fuel gas flow rate (for simplicity we assume that the fuel gas flow rate is directly manipulated ...
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