Experimental evidence for vibrational resonance and enhanced signal transmission in Chua's circuit

TL;DR

This paper provides experimental evidence of vibrational resonance in Chua's circuits and demonstrates enhanced low-frequency signal transmission in a unidirectionally coupled system, acting as a low-pass filter.

Contribution

It experimentally shows vibrational resonance in a single Chua's circuit and reveals how unidirectional coupling enhances low-frequency signal propagation in coupled circuits.

Findings

Vibrational resonance observed in single Chua's circuit.

Enhanced low-frequency signal transmission in coupled circuits.

Unidirectional coupling acts as a low-pass filter.

Abstract

We consider a single Chua's circuit and a system of a unidirectionally coupled n-Chua's circuits driven by a biharmonic signal with two widely different frequencies \omega and \Omega, where \Omega >> \omega. We show experimental evidence for vibrational resonance in the single Chua's circuit and undamped signal propagation of a low-frequency signal in the system of n-coupled Chua's circuits where only the first circuit is driven by the biharmonic signal. In the single circuit, we illustrate the mechanism of vibrational resonance and the influence of the biharmonic signal parameters on the resonance. In the n(= 75)-coupled Chua's circuits enhanced propagation of low-frequency signal is found to occur for a wide range of values of the amplitude of the high-frequency input signal and coupling parameter. The response amplitude of the ith circuit increases with i and attains a saturation. Moreover, the unidirectional coupling is found to act as a low-pass filter.