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If it is possible to measure load disturbances in the process, you can use standard
feedforward control. If the relation between the measured and the real load
disturbance varies, you can use a feedforward adaptive controller as shown in the
figure below, for example, when the flow characteristics of a pump are changed, due
to fouling in the pipe system. Feedforward adaptation then modifies the feedforward
gain, FFGain, of the controller.
