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The Scientific World Journal
Volume 2014, Article ID 303614, 16 pages
http://dx.doi.org/10.1155/2014/303614
Research Article

Experimental Realization of a Multiscroll Chaotic Oscillator with Optimal Maximum Lyapunov Exponent

1INAOE, Department of Electronics, 72480 Puebla, MEX, Mexico
2Universidad del Papaloapan, Loma Bonita, 68400 Oaxaca, MEX, Mexico

Received 26 December 2013; Accepted 21 January 2014; Published 16 April 2014

Academic Editors: A. García-Zambrana, A. Srivastava, and Z.-M. Tsai

Copyright © 2014 Esteban Tlelo-Cuautle et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Nowadays, different kinds of experimental realizations of chaotic oscillators have been already presented in the literature. However, those realizations do not consider the value of the maximum Lyapunov exponent, which gives a quantitative measure of the grade of unpredictability of chaotic systems. That way, this paper shows the experimental realization of an optimized multiscroll chaotic oscillator based on saturated function series. First, from the mathematical description having four coefficients (a, b, c, d1), an optimization evolutionary algorithm varies them to maximize the value of the positive Lyapunov exponent. Second, a realization of those optimized coefficients using operational amplifiers is given. Herein a, b, c, d1 are implemented with precision potentiometers to tune up to four decimals of the coefficients having the range between 0.0001 and 1.0000. Finally, experimental results of the phase-space portraits for generating from 2 to 10 scrolls are listed to show that their associated value for the optimal maximum Lyapunov exponent increases by increasing the number of scrolls, thus guaranteeing a more complex chaotic behavior.