Chaos in a Pendulum Adaptive Frequency Oscillator Circuit Experiment

Year 2023, Volume: 5 Issue: 1, 11 - 19, 31.03.2023

Xiaofu Li , Aubrey Beal , Robert Dean , Edmon Perkins

https://doi.org/10.51537/chaos.1204481

Cited By: 8

Abstract

Adaptive oscillators can learn and encode information in dynamic, plastic states. The pendulum has recently been proposed as the base oscillator of an adaptive system. In a mechanical setup, the horizontally forced pendulum adaptive frequency oscillator seeks a resonance condition by modifying the length of the pendulum's rod. This system stores the external forcing frequency when the external amplitude is small, while it can store the resonance frequency, which is affected by the nonlinearity of the pendulum, when the external amplitude is large. Furthermore, for some frequency ranges, the pendulum adaptive frequency oscillator can exhibit chaotic motion when the amplitudes are large. This adaptive oscillator could be used as a smart vibratory energy harvester device, but this chaotic region could degrade its performance by using supplementary energy to modify the rod length. The pendulum adaptive frequency oscillator’s equations of motions are discussed, and a field-programmable analog array is used as an experimental realization of this system as an electronic circuit. Bifurcation diagrams are shown for both the numerical simulations and experiments, while period-3 motion is shown for the numerical simulations. As little work has been done on the stability of adaptive oscillators, the authors believe that this work is the first demonstration of chaos in an adaptive oscillator.

Keywords

Adaptive oscillator, Nonlinear dynamics, Bifurcation diagrams, Field-programmable analog array, chaotic circuits

Supporting Institution

North Carolina State University

Project Number

W911NF-20-1-0336

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