Strange Attractor Type I

In this system, we have "connected" a feedback loop (Equation 3) to a van der Pol oscillator in its extended formulation:

                              dx/dt = 0.02 y + 0.4 x ( 0.2 - y2 )                   (1)

                              dy/dt = - x + s z                                           (2)

                             dz/dt = 10 x -  0.1 y                                       (3)

Indeed, this system apparently simple since it embeds only one nonlinear term, i.e. xy simulates a wide range of dynamics when varying the parameter s.

Simple but so rich !

These "Sculptures of Chaos" presented and animated in an e-paper in collaboration with Jos Leys

at the site "Images des Mathématiques", affilied to the CNRS, France.

Bouali strange









Furthermore, this chaotic system was implemented in a specific electronic device:


Chaotic attractor exhibited by the circuit for s = 50:

projections on the (a) X–Z and (b) Y–Z phase planes



Circuit design and characteristics are introduced in the paper:



Emulating complex business cycles by using an electronic analogue

co-authored by S. Bouali, A. Buscarino, L. Fortuna, M. Frasca, and L.V. Gambuzza

Nonlinear Analysis: Real World Applications 13 (2012) 2459–2465



 The PDF version available here: nonlinear-analysis-bouali-et-al.pdf nonlinear-analysis-bouali-et-al.pdf



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