Feedforward control is a control strategy that:

Feedforward control is a control strategy that:

• A. It responds to disturbances after the output has changed.
• B. It uses feedback from the output after changes occur.
• C. It ignores disturbances and only adjusts setpoints.
• D. It uses feedforward action to anticipate disturbances and compensate before the output changes.

Answer: (D)

Feedforward control acts before the process output changes by measuring or estimating a disturbance and adjusting the manipulated variable to offset its effect. This proactive adjustment relies on a model of how disturbances influence the process and on sensing the disturbance itself. The correct statement captures this idea by saying it uses feedforward action to anticipate disturbances and compensate before the output changes. In practice, feedforward is often paired with feedback to handle any mismatches between the model and reality and to correct for disturbances that can't be measured. For example, if a reactor experiences a sudden change in feed temperature, a feedforward controller could preemptively adjust the cooling or flow to keep the temperature from deviating. If you waited until the output changed to react, you’d be using feedback control, which is not anticipated by feedforward. It’s not about ignoring disturbances or only adjusting setpoints, and it doesn’t respond after changes occur, which is why those descriptions don’t fit.

Feedforward control acts before the process output changes by measuring or estimating a disturbance and adjusting the manipulated variable to offset its effect. This proactive adjustment relies on a model of how disturbances influence the process and on sensing the disturbance itself. The correct statement captures this idea by saying it uses feedforward action to anticipate disturbances and compensate before the output changes. In practice, feedforward is often paired with feedback to handle any mismatches between the model and reality and to correct for disturbances that can't be measured. For example, if a reactor experiences a sudden change in feed temperature, a feedforward controller could preemptively adjust the cooling or flow to keep the temperature from deviating. If you waited until the output changed to react, you’d be using feedback control, which is not anticipated by feedforward. It’s not about ignoring disturbances or only adjusting setpoints, and it doesn’t respond after changes occur, which is why those descriptions don’t fit.