Page 26 - ASME IMECE 2017 Program

TRACK PLENARY
Track 1: Acoustics, Vibration, and Phononics
1-1-1: PLENARY AND NCAD TUTORIAL
Wednesday, November 8, 8:00am-9:45am
Room 1, Tampa Convention Center
Symmetry and Reciprocity Breaking in Electromechanical
Metamaterials and Structural Lattices
(IMECE2017-70756)
Massimo Ruzzene
Georgia Tech
Abstract: Recent breakthroughs in condensed matter physics
are opening new directions in band engineering and wave
manipulation. Specifically, challenging the notions of
reciprocity, time-reversal symmetry and sensitivity to defects
in wave propagation may disrupt ways in which mechanical
and acoustic metamaterials are designed and employed, and
may enable totally new functionalities. Non-reciprocity and
topologically protected wave propagation will have profound
implications on how stimuli and information are transmitted
within materials, or how energy can be guided and steered
so that its effects may be controlled or mitigated.
The seminar will briefly introduce the state-of-the-art in this
emerging field, and will present concepts exploiting electro-
mechanical coupling and chiral and non-local interactions in
mechanical lattices. Shunted piezo-electric patches are
exploited to achieve time-modulated mechanical properties
which lead to one-directional wave propagation in one-
dimensional mechanical waveguides. A framework to realize
helical edge states in two identical lattices with interlayer
coupling is also presented. The methodology systematically
leads to mechanical lattices that exhibit one-way, edge-bound,
defect-immune, non-reciprocal wave motion. The presented
concepts find potential application in vibration reduction, noise
control or stress wave mitigation systems, and as part of
surface acoustic wave devices capable of isolator, gyrator and
circulator-like functions on compact acoustic platforms.
Biography: Massimo Ruzzene is the Pratt
and Whitney Professor of Aerospace and
Mechanical Engineering at Georgia Tech.
He is author of 2 books, 155 journal papers
and about 180 conference papers, and has
participated to projects funded by the AFOSR,
ARO, ONR, NASA, US Army, US Navy, DARPA, and NSF, as
well as numerous companies. His work focuses on solid
mechanics, structural dynamics and wave propagation with
application to structural health monitoring, metamaterials, and
vibration & noise control. M. Ruzzene is a Fellow of ASME, an
Associate Fellow of AIAA, and a member of AHS, and ASA.
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Track 2: Advanced Manufacturing
2-1-1: ADVANCED MANUFACTURING PLENARY
Tuesday, November 7, 8:00am–9:45am
Room 1, Tampa Convention Center
Advanced Manufacturing in the Lightweighting of Military
Ground Vehicles
(IMECE2017-73539)
Ravi Thyagarajan
US Army, TARDEC
Abstract: Weights of military ground vehicles have been con-
tinuously rising in response to ever-increasing threats and
expanding vehicle protection areas to those threats. This
has resulted in reduction of expeditionary capabilities and in
increased costs and sustainment challenges. Being expedi-
tionary ensures that the Army retains operational advantages
while (1) increasing global, operational, and tactical mobility,
(2) improving global responsiveness. The Army’s ability to
project forces, conduct forcible and early entry, and transition
rapidly to offensive operations is critical to ensuring access
and seizing the initiative. The US Army has developed a
Lightweight Combat Vehicle Science and Technology (S&T)
Campaign (LCVSTC) with specific recommendations in
organizational, design, material and manufacturing domains.
One of the findings of the cross-organizational team performing
the strategic review was that the predominant hurdles in
enabling lighter ground vehicles do not necessarily lie purely
in materials science research, but rather in the Modeling and
Simulation (M&S) and manufacturing technologies required for
the same. These and other campaign recommendations that
the Army develop clear metrics quantifying an understanding
of the operational impact that weight reduction has to the Army
will be discussed in more detail. This talk will provide the
underlying motivation for light-weighting of military ground
vehicles, and the similarities and differences to corresponding
efforts for commercial vehicles. The application of advanced
manufacturing in the light-weighting of military ground Vehicles
will be discussed. Research and innovations in different areas
such as Friction Stir Welding and other Multi-material joining
technologies, Additive Manufacturing, production processing
and development of advanced steel and aluminum alloys,
corrosion mitigation, etc., will be described.
Biography: Dr. Ravi Thyagarajan is a Science
and Technology (S&T) acquisition professional
and currently serves as the Senior Technical
Expert (STE) in Materials/Product Lifecycle
engineering at US Army TARDEC, in Warren,
Michigan. He is responsible for helping shape
the engineering and research direction for materials-related
initiatives such as Light-weighting, Additive Manufacturing,
Multi-material joining, Materials development, as well as
Modeling and Simulation (M&S) in support of the same. His
most recent assignment was as the TARDEC Deputy Chief
Scientist for over three years.
He started his civilian career in 2009 as a Senior Technical
Specialist in TARDEC/Analytics where he was the M&S Lead
for several underbody blast programs. He was the TARDEC