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Andrew N. Norris 教授学术报告
发布人:佚名 信息来源:本站原创  发布时间:2015年06月18日 点击数量:

Title: Acoustic metamaterials for underwater sound control
 
Reporter: Andrew N. Norris, Distinguished Professor, Department of Mechanical and Aerospace Engineering, Rutgers University
 
Time: 10:10,June 18,2015
Place: Room356, Physics Building, Nanjing University

Abstract: The talk will summarize some recent work on theory and practice for controlling underwater sound. The objective of underwater acoustic metamaterials is to achieve passive control of sound either in a broadband or narrowband frequency range. Two main topics will be covered: (i) Metal structures which have homogenized acoustical properties similar to water. Originally designed for transformaton acoustics (TA) applications, the "metal water" structure has been found to display interesting phononic properties which make it an excellent material for underwater negative index refraction. A negative index lens will be discussed. (ii) Cylindrical shells are used as elements for a TA device based on their wide range of effectice acoustic properties. A broadband cylindrical to square lens will be discussed, as well as a narrowband device for redirecting sound at particular frequencies.
 
 
Andrew N. Norris
Distinguished Professor
Department of Mechanical and Aerospace Engineering
Rutgers University
98 Brett Road
Piscataway, NJ 08854
 
Northwestern University, 1978 – 1981, Ph.D. Engineering Sciences and Applied Mathematics
University College, Dublin, Ireland, 1977 - 1978, M.Sc. Mathematical Physics
University College, Dublin, Ireland, 1973 –1977, B.Sc. Mathematical Physics
 
Career:
Andrew Norris is an internationally recognized expert in modeling of acoustic and elastic wave phenomena. In his 35 year research career he has worked on topics ranging from ultrasonic nondestructive evaluation for detecting cracks, modeling of underground sound for geophysical prospecting, structural acoustics for naval applications, and consulting to industry on acoustics and structural dynamics. He enjoys problems that combine physics, engineering science, applied mathematics and numerical simulation. His current interests are in developing fundamental models for mechanical metamaterials that exhibit extraordinary wave bearing properties. He is currently Distinguished Professor of Mechanical and Aerospace Engineering in the School of Engineering. He has authored or co-authored more than 160 papers in refereed journals, is editor in chief of the journal Wave Motion, and a member of the board of Editors of several journals including the Journal of the Acoustical Society of America, Mathematics and Mechanics of Solids, and the Journal of Elasticity.
 
Honors received – awards:
 
Per Bruel Gold Medal for Noise Control and Acoustics, ASME, Nov. 2014
Fulbright Fellowship to visit France, 2013
Rayleigh Lecture Award, ASME, Nov. 2011
Visiting scientist, Laboratoire de Mécanique Physique, Université Bordeaux 1, 2008-13
Fellow of the Institute of Mathematics and Applications, 2012
Fellow of the Acoustical Society of America, 1998
Visiting Fellowship, Royal Irish Academy, 1991
Royal Society Fellowship to visit universities in the United Kingdom, Feb. - March 1991
 
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