Friday, 09/21/2018 • 2:30 PM – 3:20 PM • BPB Rm. 131
Metastructures
For Wave And Vibration Control: Internal Resonances, Edge States and
Quasi-periodicity
Massimo
Ruzzene
School of Aerospace Engineering
Georgia Institute of Technology
Abstract: Beyond
the mere notion of a material, metastructures draw their unique characteristics
from their finite size and the existence of interfaces. The resulting
structural assemblies feature unprecedented performance in terms of stress wave
mitigation, wave guiding, acoustic absorption, and vibration isolation.
The talk illustrates the
frequency-selective properties of periodic metastructures, which result in
their ability to direct waves in preferential direction and attenuate
vibrations at certain frequencies. Such properties are observed in complex
structural lattices, and in structural components equipped with periodic arrays
of adaptive electromechanical resonators. The presentation will also introduce
basic concepts that govern the onset of localized, interface wave modes.
Specifically, spring-mass systems, lattices, and plates with internal
resonators will be presented as part of a framework that seeks for mechanical
lattices that exhibit one-way, edge-bound, defect-immune, wave motion. Finally,
quasi-periodic structural assemblies are introduced as configurations that
support vibration confinement in systems that are not ordered, but are
described by deterministic property distributions. Results for beam and plate
structures with quasiperiodic arrangements of grounding springs and lumped
masses are presented to illustrate the unique dynamic behavior characterized by
a multitude of highly localized modes of vibration.
Biographical
Sketch: Massimo
Ruzzene is the Pratt and Whitney Professor in the Schools of Aerospace and
Mechanical Engineering at Georgia Institute of Technology. He received a PhD in
Mechanical Engineering from the Politecnico di Torino (Italy) in 1999. He is
author of 2 books, more than 160 journal papers and 200 conference papers. He
has participated as a PI or co-PI in various research projects funded by the
Air Force Office of Scientific Research (AFOSR), the Army Research Office
(ARO), the Office of Naval Research (ONR), NASA, the US Army, US Navy, DARPA,
the National Science Foundation (NSF), as well as companies such as Boeing,
Eurocopter, Raytheon, Corning and TRW. Most of his current and past research
work has focused on solid mechanics, structural dynamics and wave propagation
with application to structural health monitoring, metamaterials, and vibration
and noise control. M. Ruzzene is a Fellow of ASME, an Associate Fellow of AIAA,
and a member of AHS, and ASA. He served as Program Director for the Dynamics,
Control and System Diagnostics Program of CMMI at the National Science Foundation
between 2014 and 2016.
For more information, contact: Xu Chen at X3688