Abstract
A “frequency domain” approach to the analysis of feedback control systems has a number of advantages over a state space approach; among several others the following may be mentioned: the graphical techniques associated with frequency domain methods (e.g. Nyquist plots) are powerful design aids, allowing spatial intuition to guide the designer in modifying a system to meet various performance criteria. mathematical models for many distributed parameter systems can be derived in closed form and written in the frequency domain as transcendental transfer functions; in contrast, a state space model requires the use of infinite-order matrices [1] or abstract operators [9].
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