A new scheme of automatic control called disturbance-response feedback is presented. A special form of this method utilizing a dynamic model of the plant in a feedback path is called plant-model control. The classically difficult-to-control plant having a transfer operator consisting of pure delay (transportation lag or dead time) is shown to be brought under optimum control in an experimental study. Disturbance-response feedback requires for optimization the specification of only one parameter. Therefore it provides a useful reference basis for evaluating other schemes. This is done for some simple systems of control. The plant-model control technique offers a possible basis for realizing a completely self-adjusting automatic controller.

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