Session: 01-01-01: General Topics of Aerospace Structures

Paper Number: 108516

108516 - Design and Analysis of Periodic Lattice Beams for Wave Guiding and Vibration Attenuation 

Structures that are subject to dynamic loadings may undergo destructive vibrations. These undesirable vibrations can have a detrimental effect on the host structure and may cause malfunctioning or eventual failure. Recently, significant research interest has emerged to create mechanical metamaterials that are able to control elastic wave propagation and mechanical vibrations. These materials have the potential to be used in a variety of vibration suppression applications including the automotive, aerospace, marine, and home appliance industries. One unique dynamic property that is widely studied is the formation of band gaps in elastic periodic structures. Band gaps are frequency ranges that elastic waves do not propagate through the material and the structure show reduced vibration level in this band. Moreover, there has been exciting opportunities for mechanical metamaterials that use strategic microstructure to control the direction of wave propagation, exhibiting an exceptional dynamic response. For instance, kagome architectures are example of lattices that enable topological polarization, leading to asymmetric wave transport. In this paper, we combine both approaches and use simulations and experiments to show that the rational design of periodic beams with kagome lattices provides opportunities for manipulating asymmetric wave propagation as well as controlling bandgaps. The effect of geometric changes to the lattice architecture on the bandgaps and wave propagation are also explored.

Presenting Author: Maya Pishvar California State University Northridge

Presenting Author Biography: NA

Authors:

Maya Pishvar California State University Northridge
Peter L. Bishay California State University Northridge
Mosab Naser Nossor California State University Northridge