Monday  |  Salon 12  |  04:20 PM–04:40 PM

#18619–Bandgap Design of Metamaterial Structures by Varying Local Resonator Properties

The concept of metamaterials can be used in structural dynamics to reduce vibrations. By attaching local resonators of given eigenfrequency to a host structure, a so-called bandgap is created which indicates significant vibration reduction in a broad frequency range. Although the resonators are basically represented by spring-mass systems the bandgap phenomenon goes beyond the well-known tuned mass damper behavior. This is due to the fact that the resonators are positioned at different locations of the host structure. It is well known that by increasing the mass of the resonators, the band gap width also increases. However, adding weight is not always a viable option when it comes to lightweight structures for example.
In this study we investigate new ways to increase the bandgap width without adding mass to the metamaterial structure. We consider a set of resonators for which we change individual stiffness values and investigate different arrangements of the eigenfrequency distribution of the resonators while keeping the total mass constant. The resonators influence the host structure dynamics and can be seen as a band-pass filter for mechanical waves which offers various possible applications in the field of vibration mitigation.

Hannes Woehler   Leibniz University Hannover
Sebastian Tatzko   Leibniz University Hannover