Fractal system as represented by singularity function

Abstract

A fractional slope on the log-log Bode plot has been observed in characterizing a certain type of physical phenomena and has been called the fractal system or the fractional power pole. In order to represent and study its dynamical behavior, a method of singularity function is presented which consists of cascaded branches of a number of pole-zero (negative real) pairs or simple RC section. The distribution spectrum of the system can also be easily calculated and its accuracy depends on a prescribed error specified in the beginning. The method is then extended to a multiple-fractal system which consists of a number of fractional power poles and the result can be simulated by a combination of singularity functions, each representing a single-fractal system. © 1992 IEEE