On the Study of Chaos and Memory Effects in the Bonhoeffer-van der Pol Oscillator with a Non-Ideal Capacitor

TL;DR

This study investigates how memory effects in a non-ideal capacitor influence the chaotic and oscillatory behavior of the Bonhoeffer-van der Pol oscillator, revealing that increased memory enhances energy storage and alters dynamical regimes.

Contribution

It introduces a fractional differential equation model for the non-ideal capacitor, linking memory effects to the oscillator's dynamical behavior and energy storage.

Findings

Memory parameter increases energy stored in dielectric.

Oscillation death leads to higher energy storage.

Memory effects influence voltage dynamics and dielectric behavior.

Abstract

In this paper, the voltage fluctuations of the Bonhoeffer van der pol oscillator system with a non-ideal capacitor were investigated. Here, the capacitor was modeled, using a fractional differential equation in which the order of the fractional derivative is also a measure of the memory in the dielectric. The governing fractional differential equation was derived using two methods, namely a differential and integral approach. The former method utilized a hierarchical resistor-capacitor (RC) ladder model while the latter utilized the theory of the universal dielectric-response. The dynamical behavior of the potential across the capacitor was found to be affected by this parameter, and, therefore, the memory of the system. Additionally, findings indicate that an increase in the memory parameter was associated with an increase in the energy stored in the dielectric. It was found that oscillation death resulted in a higher amount of stored energy in the dielectric over time, as compared to behavior, which displayed relaxation oscillations or chaotic fluctuations. The relatively-lower stored energy resulting from the latter types of dynamical behavior appeared to be a consequence of the memory effect, where present accumulations of energy in the capacitor are affected by previous decreases in the potential. Hence, in this type of scenario, the dielectric material can be thought of as remembering the past behavior of the voltage, which leads to either a decrease, or an enhancement in the stored energy. The non-ideal capacitor was also found to have a transitory nature, where it behaves more like a resistor as {\alpha} approaches 0, and conversely, more like a capacitor as {\alpha} goes to 1. Here, a decrease in {\alpha} was linked to an enhanced metallic character of the dielectric.