Enhancing the Dynamic Range of Targeted Energy Transfer in Acoustics Using Several Nonlinear Membrane Absorbers

TL;DR

This paper explores how using multiple nonlinear membrane absorbers in parallel can significantly enhance the robustness and energy range of targeted energy transfer in acoustics, supported by experiments and modeling.

Contribution

It introduces a novel approach of employing several nonlinear membrane absorbers in parallel to extend TET efficiency and observation range, supported by experimental and theoretical analysis.

Findings

Multiple absorbers extend TET energy range.

Experimental results show increased robustness of TET.

Modeling confirms potential for more than two membranes.

Abstract

In order to enhance the robustness and the energy range of efficiency of targeted energy transfer (TET) phenomena in acoustics, we discuss in this paper about the use of multiple nonlinear membrane absorbers in parallel. We show this way, mainly thanks to an experimental set-up with two membranes, that the different absorbers have additional effects that extend the efficiency and the possibilities of observation of TET. More precisely, we present the different behavior of the system under sinusoidal forcing and free oscillations, characterizing the phenomena for all input energies. The frequency responses are also presented, showing successive clipping of the original resonance peak of the system. A model is finally used to generalize these results to more than two NES and to simulate the case of several very similar membranes in parallel which shows how to extend the existence zone of TET.