<p>This paper investigates the energy redistribution in a 2-DOF system caused by a nonlinear energy sink (NES) where the nonlinearity is introduced by an elastic strut element with quasi-zero stiffness (QZS). First, a mathematical model for the restoring force of the elastic strut element is proposed and parameters are identified based on experimentally measured force profiles. Next, we consider the effect of the QZS NES on the flow of energy in the system by simulating the response of the system to different initial velocities and tracking the total energy left in each oscillator during the oscillation. We also investigate the dynamics of the system using Poincaré maps and by studying the energy dissipated by each damper. We find that the use of a QZS element introduces more complexity of the stability and&nbsp;improves the performance of the NES by expanding the range of initial velocities or impacts for which it is able to mitigate the vibrations of the parent structure more efficiently than its linear counterpart. The computational results are verified using an experimental system consisting of two QZS elements where the nonlinear force is achieced by the impact between the NES and the QZS elements, such that a uniform restoring force profile is realized. &nbsp;</p>

Energy Isolation Study by Utilizing Quasi-Zero Stiffness Introduced by Buckling in Elastic Strut Elements

Paper Proceedings: https://asmedigitalcollection.asme.org/IDETC-CIE/IDETC-CIE2021/volume/85369

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