Page 22 - ASME IMECE 2016 Program

Special Events TUESDAY

for civilian aircraft. U.S. and international regulations currently prohibit KOITER LECTURE
unrestricted civil supersonic flight. There is a lot of interest by NASA and 5:00PM–6:15PM
industry to develop the technology for small supersonic aircraft that will 125A, Phoenix Convention Center
sound much less objectionable to the pubic (converse to the former Title: Nonlinear Composites: A Guided Tour
Concorde), enabling overland flight. Most of the recent and ongoing
research work is directed toward developing an aircraft body with a Pedro Ponte Castañeda, University of Pennsylvania
special geometrical shape so that the resulting supersonic pressure
signature is a sound that has a substantially reduced loudness. Such Abstract: All materials exhibit nonlinear constitutive response (e.g.,
boom shaping has already been demonstrated and proven in limited ways. plasticity, magnetic saturation) at sufficiently large mechanical or other
NASA is currently developing a Quiet Supersonic Technology (QueSST) stimuli. Unlike linear behavior, which comes in essentially one “flavor” (plain
demonstration aircraft to validate the adequacy of the approach and the vanilla), nonlinear behavior comes in a dizzying array of flavors! Partly for this
associated technologies. At the same time, some in industry would like to reason, it is especially challenging, to develop general methods for
build a supersonic aircraft without consideration of passive noise estimating the macroscopic response of nonlinear composites, or heteroge-
mitigation shaping but instead flown overland at prescribed speeds such neous materials with constituents exhibiting nonlinear response. For
that the resulting sonic boom never reaches the ground, and this is called material systems with specific microstructures and types of nonlinearity,
Mach cut-off flight. Both the geometrical aircraft shaping and Mach cut-off special “micromechanical” models have been developed, which often work
approaches seem feasible to reduce the loudness, and this presentation very well for the special set of conditions for which they where developed,
will outline the technical basis for each. Oh, if Rayleigh could see us now! but which are difficult to generalize, or which don’t work so well more
generally. In this presentation, I will discuss a more general “homogeniza-
[The author and his students are supported by NASA and the FAA. The tion” approach that is based on the notion of a “linear comparison compos-
opinions, findings, conclusions and recommendations expressed in this ite” making use of appropriately designed variational principles. Such
material are those of the author and do not necessarily reflect the views of “variational linear comparison” methods provide optimal linearization
ASCENT FAA Center of Excellence sponsor organizations.] schemes allowing the direct conversion of robust homogenization estimates
for linear composites into corresponding estimates for nonlinear compos-
Biography: Victor W. Sparrow has been a faculty member in the Graduate ites. We will go on a “tasting tour” of nonlinear composites and consider
Program in Acoustics at The Pennsylvania State University since 1990. Vic several examples ranging from plasticity of composites and polycrystals to
currently is Professor of Acoustics, and he serves as Director of the Penn magneto- and electro-active composites to fluid suspensions of soft
State Acoustics Program. During 2006 to 2015 he served as a U.S. particles. The objective will be to show how these methods can be used to
Research Focal Point for the International Civil Aviation Organization's generate relatively simple (quasi-)analytical estimates for the macroscopic
Committee on Aviation Environmental Protection, and he is currently response---and field statistics---which can, in turn, be used to develop
serving as a co-rapporteur for CAEP's Impacts and Science Group. His constitutive subroutines (UMATs) for use in standard finite element
usual duties include research and teaching graduate level courses, such simulations at higher (structural) length scales. Interestingly, these homoge-
as The Acoustics of Fluid Media, Nonlinear Acoustics, Computational nized models have the capability to account for coupled effects, microstruc-
Acoustics, Outdoor Sound Propagation, and Spatial Sound and 3D Audio. ture evolution under finite strain conditions, as well as for the possible
He has served the Acoustical Society of America as a member of development of material instabilities under appropriate loading conditions.
Executive Council and as Vice-President, and he is an ASA Fellow. He has
been a member of ASME since 1993.
ADVANCED ENERGY SYSTEMS DIVISION RECEPTION.
SPONSORED BY THE ADVANCED ENERGY SYSTEMS DIVISION
NOISE CONTROL AND ACOUSTICS DIVISION WINE & CHEESE 5:30PM–7:30PM
RECEPTION. SPONSORED BY THE NOISE CONTROL AND Camelback A, Sheraton Grand
ACOUSTICS DIVISION
5:00PM–6:30PM THE FRANK KREITH ENERGY AWARD was established in 2005 to honor an
Paradise Valley, Sheraton Grand individual for significant contributions to a secure energy future with particular
emphasis on innovations in conservation and/or renewable energy. Contribu-
tions may be through research, education, practice, or significant service to
society that will lead to a sustainable energy future. The award was estab-
lished by the Solar Energy and Advanced Energy Divisions to honor Dr. Frank
WOMEN IN ENGINEERING RECEPTION Kreith’s contributions to solar energy and heat transfer, and was funded by
5:30PM–7:00PM Holocaust Settlement Claim No. 4931 for Nazi victims and by the Kreith family.
Oculus, Sheraton Grand
Sponsored by the Diversity & Inclusion Strategy Committee, the Petroleum
Division of the TEC Sector and the Women in Engineering Community FLUIDS ENGINEERING DIVISION RECEPTION. SPONSORED BY
THE FLUIDS ENGINEERING EXECUTIVE COMMITTEE
The reception provides a focal point at the conference for a gathering of 6:30PM–8:30PM
22 women from the wide range of ASME activity for networking and a bit of Maryvale B, Sheraton Grand
casual relaxation at the end of a conference day. The event is open to all
ASME women engineers/engineering students.

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