Resonance energy transport in an oscillator chain

TL;DR

This paper explores how energy transfer and localization occur in a coupled oscillator chain under different resonance conditions, revealing that slowly varying forcing can localize energy on the nonlinear actuator.

Contribution

It demonstrates the contrasting effects of constant versus slowly varying forcing frequencies on energy localization in a resonance-locked oscillator system.

Findings

Constant frequency forcing causes energy growth in the linear chain.

Slowly increasing frequency results in energy localization on the nonlinear actuator.

Numerical and asymptotic solutions show good agreement.

Abstract

We investigate energy transfer and localization in a linear time-invariant oscillator chain weakly coupled to a forced nonlinear actuator. Two types of perturbation are studied: (1) harmonic forcing with a constant frequency is applied to the actuator (the Duffing oscillator) with slowly changing parameters; (2) harmonic forcing with a slowly increasing frequency is applied to the nonlinear actuator with constant parameters. In both cases, stiffness of linear oscillators as well as linear coupling remains constant, and the system is initially engaged in resonance. The parameters of the systems and forcing are chosen to guarantee autoresonance (AR) with gradually increasing energy in the nonlinear actuator. As this paper demonstrates, forcing with constant frequency generates oscillations with growing energy in the linear chain but in the system excited by forcing with slowly time-dependent frequency energy remains localized on the nonlinear actuator whilst the response of the linear chain is bounded. This means that the systems that seem to be almost identical exhibit different dynamical behavior caused by their different resonance properties. Numerical examples a good agreement between exact (numerical) solutions and their asymptotic approximations found by the multiple time scales method.