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THE MIRACLE OF RESONANCE AND FORMANTS

Eric Heller
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Eric Heller's research group focuses on few body quantum mechanics, scattering theory and quantum chaos. Recurrent but not universal themes are semiclassical approximations, classical nonlinear dynamics and time-dependent quantum mechanics. Recent progress in semiclassical methods has allowed a wide range of new quantum problems to be understood in terms of classical mechanics, greatly aiding physical insight. At the other end of the spectrum, the extreme quantum limit (e.g. ultracold collisions) have come to the forefront and are also group interests. Current investigations include cold atom waveguides, scattering theory of quantum dots and electron transport in semiconductor heterostructures, surface state electron "quantum corral" scattering from defects and adsorbed atoms on metal surfaces, localization theory of eigenstates, semiclassical theory of tunneling and diffraction, semiclassical approaches to many body systems, ocean wave physics, and quantum correspondence to classical chaos (scars, spectra, wavefunctions, dynamics).


Harvard University, Department of Physics

Resonance is well known to underly many effects in acoustics, but is a far more powerful and general phenomenon than the common examples suggest. For example, resonance does not have to involve periodic events, but rather can be nearly instantaneous - within one period of oscillation. Examples are the reproducer on an Edison gramophone, giving a formant covering the whole human audio response, or the generation of a singer's formant. The deliberate formant shaping of musical instruments is accomplished with resonant "gatekeepers" such as a trumpet mouthpiece or a violin bridge. Resonance can involve a single or a few in-phase, time delayed additions of amplitude, giving rise to repetition pitch. Indeed the sensation of pitch is a kind of resonance, the tendency (not necessarily the certainty) of a pressure amplitude signal to at least partially mimic itself at after certain time interval; the inverse of this interval is the perceived frequency. These and other windows into the phenomenon of resonance will be discussed, with audio examples.



ADVANCES IN FLUTTER ANALYSIS AND CONTROL OF AIRCRAFT STRUCTURES

Haiyan Hu
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Haiyan Hu received Ph. D. in Solid Mechanics from Nanjing University of Aeronautics and Astronautics (NUAA), China in 1988. Afterwards, he joined the faculty at NUAA and became Professor of Applied Mechanics in 1994. He was a Humboldt Researcher Fellow at University of Stuttgart, Germany from 1992 to 1994, and a Visiting Professor at Duke University, USA from 1996 to 1997. He has served as President of Beijing Institute of Technology since 2007. Prof. Hu has made recognized contributions to the nonlinear dynamics and control of aerospace systems, including the controlled structures with delayed feedback, the nonlinear vibration isolation of missile stabilizers, the active flutter suppression of aircraft, the deployment dynamics of space antennas. Out of his contributions, he was elected Fellow of Chinese Academy of Sciences in 2007 and Fellow of TWAS in 2010. He was awarded Honorary Doctor by Moscow State University, Russia in 2015.

MOE Key Lab of Dynamics and Control of Flight Vehicle,
School of Aerospace Engineering,
Beijing Institute of Technology, Beijing, 100081, China

Minimizing structure weight is vital in the design of an aircraft. The reduction of structure weight, however, may reduce structure stiffness and consequently induce dangerous flutter. Traditional passive remedies for avoiding flutters usually add structure weight in the form of additional structure or mass ballast. Hence, the active flutter suppression via the feedback control according to measured structure response has received much attention. To achieve the better performance of active flutter suppression, it is necessary to understand the coupling between the aerodynamic load and the aircraft structure under control and to design the control strategy based on proper models. This lecture presents the recent studies of author's lab on the flutter analysis and control of aircraft structures with emphasis on both nonlinearities and high dimensions. The nonlinearities come from the backlash of control surface and the aerodynamic load of transonic flow, while the high dimensions are due to not only the complicated models of both aircraft structure and aerodynamic load, but also the time delay in the control loop. The lecture presents how to establish the proper model of reduced order for nonlinear aerodynamic load, how to predict the flutter boundary and how to design the control strategies of active flutter suppression when the above nonlinearities and time delays are taken into account. The lecture gives several case studies of numerical simulations and wind tunnel tests for three dimensional wings. Finally, the lecture addresses a number of open problems related to the flutter analysis and control of aircraft structures.



THE EAR BEYOND HEARING: FROM SMART EARPLUG TO IN-EAR BRAIN COMPUTER INTERFACES

Jeremie Voix
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Jérémie Voix received a Master in Fundamental Physics from Université de Lille 1 (France) in 1995, a M.A.Sc. in Acoustics from Université de Sherbrooke in 1997 and a PhD -with great distinction- from École de technologie supérieure (ÉTS) in Montreal in 2006. From 2001 to 2010, he is VP of Scientific Research then CTO at Sonomax Hearing Healthcare. One of his key contributions is an objective field attenuation measurement system for hearing protectors currently commercialized as "EARfit" by 3M's Occupational Health & Environmental Safety Division. Since 2010, he is Associate Professor at ÉTS and leads the Sonomax-ÉTS Industrial Research Chair in In-Ear Technologies. He is author and co-author of more than 65 peer-reviewed scientific articles and of technical presentations and inventor on 15 design and utility patents. Together with a motivated and gifted team, he is working to merge hearing aid, hearing protection and communication technologies within a single in-ear device. Research horizons include interpersonal radio-communication systems and on-board hearing health monitoring. Dr. Voix is editor in chief of Canadian Acoustics journal, published by the Canadian Acoustical Association (CAA), member of the Canadian Standards Association (CSA) committee Z94,2 on Hearing Protection, and an active member of American National Standard Institute (ANSI) working group S12-WG11. His activities include writing the technical draft of the future ANSI S12.71-201X standard, which will govern field attenuation measurement systems for hearing protectors. Jérémie Voix is an Associate Member of the BRAMS, the International Laboratory for Brain, Music and Sound Research and is a Full Member of the CIRMMT, the Centre for Interdisciplinary Research in Music Media and Technology. Since 2013, he is also an academic member of the Erasmus Mundus Student Exchange Network in Auditory Cognitive Neuroscience. Professor Jeremie Voix has been recognized in 2012 as one of the five most innovative researcher in communication and information technology by TechnoMontréal, the Montreal's communication and information technologies cluster.

CRITIAS Industrial Research Chair in In-Ear Technologies
Université du Québec

Wearables are everywhere. But in the ears (yet). The CRITIAS research team has been actively developing various in-ear technologies designed to complement the human ear, from "smart" hearing protection against industrial noises, to advanced inter-individual communication systems, to hearing health monitoring devices using otoacoustic emission (OAE), to in-ear EEG Brain Computer Interface (BCI). More fundamental research has also been conducted, particularly on the micro-harvesting of electrical power from inside the earcanal to power future auditory wearables. Recent research and developments, from CRITIAS and labs around the world, will be presented to the ICSV community who should end up with a different view on the human ear!



READING THE WORLD WITH TWO EARS

Jens Blauert
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Jens Blauert, Dr.-Ing., Dr. Tech. h. c. is emeritus professor at the Institute of Communication Acoustics of Ruhr-University Bochum, Germany, an institute that he has founded and directed for 30 years. He is also distinguished visiting professor at the Rensselear Polytechnic Institute, Troy NY ‒ adjunct to their architectural-acoustics program. Jens Blauert was elected fellow of AES, ASA, IoA and IEEE. Since 2016, he is honorary fellow of the IIAV . He has received numerous medals and awards, is cofounder of the European Acoustics Association, EAA , and was their chairman of the board for 10 years. Further he served as president of the German Acoustical Society, DEGA, and looks back on 35 years as chartered acoustical consultant in architectural acoustics. His publication list comprises more than 180 scientific items, including 5 books. His research topics are spatial hearing, binaural technology, aural architecture, virtual environments, and quality of experience. Currently he is particularly interested in modeling active binaural listening.


Institute of Communication Acoustics, Ruhr-Universität Bochum

Modern communication-acoustical systems – now often realized as embedded components in more complex communication systems – contain an ever growing amount of built-in explicit knowledge as well as the capability of autonomous-learning. In other words: Communication Acoustics Gets Cognitive! In this lecture this trend will be discussed and according research demands will be identified. To further illustrate these lines of thinking, results from the EU-Project TWO!EARS (ICT-618075, twoears.eu) will be reported. In this project, element of linear binaural auditory signal processing have been augmented by several feedback loops and cognitive components that represent ground-truth knowledge and enable built-in learning algorithms. In one of the demonstration scenarios of the project, a robot analyses a search-and-rescue scenario with multiple active sound sources and identifies and localizes potential victims in it.



NONLINEAR DYNAMICS OF OFFSHORE STRUCTURES IN MARINE CURRENTS AND ICE

Andrei Metrikine
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Andrei has graduated from the faculty of radio-physics of the State University of Nizhniy Novgorod, Russia in 1989. After graduation he became a junior researcher at the Mechanical Engineering Institute of RAS (Russian Academy of Sciences). In 1992 he received his PhD degree in the field of Theoretical Mechanics from State Technical University of St. Petersburg, Russia. After that he was a researcher, senior researcher and leading researcher at the Mechanical Engineering Institute of RAS (1992 –present, since 1999 for 0.0 fte). In 1994-1996 Andrei was a post doctoral researcher at Delft University of Technology and then, in 1996 - 1997, a Humboldt's Foundation fellow in the Institute for Mechanics of the Hannover University, Germany. In 1998 he has received his Dr.Sc. (Doctor of Sciences) degree in the field of Mechanics of Solids from Institute for Problems in Mechanical Engineering RAS, St.Petersburg, Russia.

Delft University of Technology, Faculty of Civil Engineering and Geosciences

NONLINEAR DYNAMICS OF OFFSHORE STRUCTURES IN MARINE CURRENTS AND ICE



CLIMATE CHANGE, DOLPHINS, SPACESHIPS ON ANTIMICROBIAL RESISTANCE – THE IMPACT OF BUBBLE ACOUSTICS

Timothy Leighton
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Timothy Leighton is Professor of Ultrasonics and Underwater Acoustics withing Engineering and the Environment at the University of Southampton, UK. He is the founding Chairman of the University Strategic Research Group NAMRIP (Network for Anti-Microbial Resistance and Infection Prevention) and founding Chairman of HEFUA (Health Effects of Ultrasound in Air). He has invented numerous devices for healthcare, catastrophe relief and industry.

University of Southampton

Bubbles couple to sound fields to an extraordinary extent, generating and scattering sound, and changing the chemical, physical and biological environments around them when excited to pulsate by an appropriate sound field. This paper accompanies a plenary lecture, opening with the way that the sound emitted by bubbles, when they are injected into the ocean by breaking waves, helps track the >1 billion tonnes of atmospheric carbon that transfers between atmosphere and ocean annually. However, compared to carbon dioxide, atmospheric methane has at least 20 times the ability, per molecule, to generate 'green-house' warming. Worldwide there is more than twice the amount of carbon trapped in the seabed in the form of methane hydrate than the amount of carbon worldwide in all other known conventional fossil fuels. Acoustics can track the release of bubbles of seabed methane as this hydrate dissociates in response to increasing ocean temperatures, an effect cited by some as a possible climate apocalypse. Continuing the methane theme, this paper discusses the sounds of methane/ethane 'waterfalls' on Titan, Saturn's largest moon, before returning to Earth's oceans to discuss how whales and dolphins might use the interaction between sound and bubbles when hunting. This in turn suggests possibilities for radar in the search for improvised explosive devices. The paper closes with consideration of another apocalypse, discussing the role that bubbles and acoustics have in mitigating the 'antibiotic apocalypse', when in response to the increasing use of antimicrobials (antibiotics to combat bacterial infections; anti-virals for viral infections; anti-fungals for fungal infections; and targeted chemicals to combat parasites) the four classes of microbes all naturally evolve resistance, such that by 2050 Anti-Microbial Resistance will be killing more people than cancer, and will have cost the world economy more than the current size of the global economy.


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