Triangular function feedback control for chaotic systems featuring coexisting attractors.

Chaos has emerged as a significant area of research, with the control of chaotic systems being central to this field. This study proposes a novel trigonometric feedback control strategy to regulate Hopf bifurcation in a four-dimensional hyperchaotic system featuring coexisting attractors. By introducing a nonlinear controller [Formula: see text], we establish the stability criteria for equilibrium points under the parameter space a>0, b>0, and [Formula: see text]. Theoretical analysis reveals that the system undergoes a supercritical Hopf bifurcation at [Formula: see text], leading to the emergence of stable limit cycles. Numerical simulations validate the control efficacy: periodic oscillations are observed at d = -1, while equilibrium convergence is achieved at d = -3. Phase portrait analysis and Lyapunov exponent spectra confirm the suppression of chaotic dynamics. This work advances the theoretical framework for bifurcation control in high-dimensional chaotic systems and offers practical implications for secure communication applications.