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Multistability; bifurcation; Lyapunov exponent; synchronization.

In this paper, a generalized scheme is proposed for designing multistable continuous dynamical systems. The scheme is based on the concept of partial synchronization of states and the concept of constants of motion. The most important observation is that by coupling two mdimensional dynamical systems, multistable nature can be obtained if i number of variables of the two systems are completely synchronized and j number of variables keep a constant difference between them i.e., their differences are constants of motion, where $i+j = m$ and $1 \le i, j \le m−1$. The proposed scheme is illustrated by taking coupled Lorenz systems and coupled chaotic Lorenzlike systems. According to the scheme, two coupled systems reduce to single modified system withsome initial condition-dependent parameters. Time evolution plots, phase diagrams, variation of maximum Lyapunov exponent and bifurcation diagrams of the systems are presented to show the multistable nature of the coupled systems.

PAL SANTINATH¹ SAHOO BANSHIDHAR¹ PORIA SWARUP¹

1. Department of Applied Mathematics, University of Calcutta, Kolkata 700 009, India

Manuscript received

2 December 2014

Manuscript revised

11 May 2015

Accepted

21 August 2015

Early published

8 April 2016