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describing function

   Also found in: Wikipedia 0.03 sec.
describing function [di′skrīb·iŋ ‚fəŋk·shən]
(control systems)
A function used to represent a nonlinear transfer function by an approximately equivalent linear transfer function; it is the ratio of the phasor representing the fundamental component of the output of the nonlinearity, determined by Fourier analysis, to the phasor representing a sinusoidal input signal.


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It systematically analyzes several fuzzy proportional-integral-derivative (PID) control systems and state space control and also takes on self-learning control mechanisms while covering fuzzy reasoning, fuzzy control, linear and non-linear fuzzy PID control, stability analysis by describing functions, and supervisory control.
The descriptive method of specifying has some limited applications in specifying hardware, mostly in describing functions of electronic systems.
This comprehensive book: * uses a fresh approach, bridging the gap between classical and modern, linear and nonlinear multivariable control theories; * includes vital nonlinear topics such as limit cycle prediction and forced oscillations analysis on the basis of the describing function method and absolute stability analysis by means of the primary classical frequency-domain criteria (e.
 
 
 
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