NSF East Asia and Pacific Summer Institute (EAPSI) for FY 2013 in Japan

Sakamoto Nicholas Y, West Lafayette IN

Investigators

Abstract

This action funds Nicholas Yoshio Sakamoto of Purdue University to conduct a research project in Engineering during the summer of 2013 at Kansai University in Osaka. The project title is "Modeling Tensioned Membranes Using an Electromagnetic Numerical Method." The host scientists are Professor Yasuhito Kawai and Professor Masahiro Toyoda. Tire-pavement noise and vibration have a significant impact on motor vehicle pass-by noise, passenger comfort, and manufacturer design constraints. Previously, modal models of tire vibration have been developed, but they are not appropriate in the high frequency region (above 1 kHz) in which most tire noise is generated. Modal models are inappropriate both because of the number of modes involved and the heavy damping of the tire structure (so that waves generated in the contact patch area are fully attenuated by the time they propagate half way around the tire). This project applies the Finite-Difference Time-Domain method, which has an established history in the field of electromagnetics, to acoustics and vibroacoustic problems which could be instrumental in developing a model to computationally determine the behavior of noise and vibrations within tires and other tensioned membranes. Broader impacts of an EAPSI fellowship include providing the Fellow a first-hand research experience outside the U.S.; an introduction to the science, science policy, and scientific infrastructure of the respective location; and an orientation to the society, culture and language. These activities meet the NSF goal to educate for international collaborations early in the career of its scientists, engineers, and educators, thus ensuring a globally aware U.S. scientific workforce. Upon returning, a seminar will be set-up to convey personal research experiences and to encourage other U.S. born researchers at the Ray W. Herrick Laboratories to explore the advantages of NSF international fellowships and direct contact with international labs performing similar research.