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  2. Feed forward (control) - Wikipedia

    en.wikipedia.org/wiki/Feed_forward_(control)

    With feed-forward or feedforward control, the disturbances are measured and accounted for before they have time to affect the system. In the house example, a feed-forward system may measure the fact that the door is opened and automatically turn on the heater before the house can get too cold.

  3. Closed-loop controller - Wikipedia

    en.wikipedia.org/wiki/Closed-loop_controller

    In some systems, closed-loop and open-loop control are used simultaneously. In such systems, the open-loop control is termed feedforward and serves to further improve reference tracking performance. A common closed-loop controller architecture is the PID controller. A basic feedback loop

  4. Closed system (control theory) - Wikipedia

    en.wikipedia.org/wiki/Closed_system_(control_theory)

    The terms closed system and open system have long been defined in the widely (and long before any sort of amplifier was invented) established subject of thermodynamics, in terms that have nothing to do with the concepts of feedback and feedforward. The terms 'feedforward' and 'feedback' arose first in the 1920s in the theory of amplifier design ...

  5. Closed-loop transfer function - Wikipedia

    en.wikipedia.org/wiki/Closed-loop_transfer_function

    An example of a closed-loop block diagram, from which a transfer function may be computed, is shown below: The summing node and the G ( s ) and H ( s ) blocks can all be combined into one block, which would have the following transfer function:

  6. Proportional–integral–derivative controller - Wikipedia

    en.wikipedia.org/wiki/Proportional–integral...

    Feed forward can be based on the setpoint and on extra measured disturbances. Setpoint weighting is a simple form of feed forward. For example, in most motion control systems, in order to accelerate a mechanical load under control, more force is required from the actuator.

  7. Control system - Wikipedia

    en.wikipedia.org/wiki/Control_system

    A control system manages, commands, directs, or regulates the behavior of other devices or systems using control loops. It can range from a single home heating controller using a thermostat controlling a domestic boiler to large industrial control systems which are used for controlling processes or machines.

  8. Is It Safe to Use Expired Vitamins? The Truth About Vitamin ...

    www.aol.com/vitamins-expire-nutritionists-weigh...

    For example, probiotics—which are usually sold in the vitamin aisle—sometimes require refrigeration. Also, capsules that contain liquid or oil may deteriorate more quickly than those that don’t.

  9. Internal model (motor control) - Wikipedia

    en.wikipedia.org/wiki/Internal_model_(motor_control)

    Feed-forward control computes its input into a system using only the current state and its model of the system. It does not use feedback, so it cannot correct for errors in its control. In feedback control, some of the output of the system can be fed back into the system's input, and the system is then able to make adjustments or compensate for ...