Abstract

The frequency-response method has grown from its beginning during World War II to its present position as the principal method of analyzing and synthesizing automatic-feedback-control systems. This growth can be traced by an examination of the pertinent published material. Dividing this material into fields of interest, such as, Basic Theory; Nonlinear Systems; Books; Applications—Autopilot, Process Control, Components, and so on, makes it possible to study the development of these diverse aspects of the frequency-response method.

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