NUMERICAL INVESTIGATION OF SIGNAL AMPLIFICATION VIA VIBRATIONAL RESONANCE IN A CHUA’S CIRCUIT.

In this paper, we numerically investigated the occurrence of Vibrational Resonance in a modified Chua’s oscillator with a smooth nonlinearity, described by a cubic polynomial. Response curves generated from the numerical simulation at the low frequency reveal that the system’s response amplitude could be controlled by modulating the conductance parameter of the Chua’s circuit, rather modulating the parameters of the fast periodic force. Modulating the frequency of the fast periodic force slightly reduces the response amplitude; shifts the peak point to a higher value of the amplitude of the fast periodic force by widening the resonance curves. Within certain parameter regime of the high frequency (Ω≥ 100 ω), the system’s response gets saturated, and further increase does not affect its amplitude.