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#44 Active Sound Design

Markus Bodden
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Markus Bodden studied electrical engineering at Bochum University (Germany), specializing into the field of human auditory perception. He finished his PhD on the simulation of the Cocktail-Party-Effect in 1992 at the institute of acoustics of Prof. Blauert. Besides his work in the academic sector, he started to consult automotive industries in Sound Quality and Sound Design in his company Product Sound founded in 1994.
He extended his work to Active Sound Design in the company neosonic which he founded together with Torsten Belschner. neosonic is a pioneer in the field of Active Sound Design for automotive industries, covering the complete range from research, customer perception and Sound Design to the corresponding hard- and software implementations for tooling and vehicle series integration. The world's first electric series vehicle with an interior sound generation (Mercedes AMG SLS Coupe ED) is equipped with the neosonic system and drives with a sound developed by neosonic, and many other vehicle types followed since then.

neosonic GmbH
Markgrafenstr. 13
79115 Freiburg, Germany

Sound levels emitted by machines and vehicles have been significantly reduced in the past decades based on intensive Sound Engineering optimizations. This reduction went up to the point when it became obvious that sounds from products are not only to be considered as noise, but that they transport specific information which are important for the receiving human. As a consequence, the field of Sound Quality emerged, aiming at optimizing sounds for specific use cases. The optimization process induced the necessity to shape sound, thus to apply Sound Design, which is tedious to realize and limited in performance if it can be performed on a pure mechanical level only. Considering the fast-developing electronic sound generation and manipulation technologies and availabilities Active Sound Design (ASD) opened new application scenarios and eased the process.
Active Sound Design is a comprehensive and powerful technology that is well established primarily in the automotive sector. It can be used to further reduce sound levels by Active Noise Control, but mainly to support and create sound features which are missing in specific usage scenarios. Nowadays car manufactures are forced by legislation to equip electric vehicles with an Acoustical Vehicle Alert System (AVAS) to prevent accidents with pedestrians, but apart from this legal requirement ASD is heavily used to increase the driver feedback, improve interaction, address emotions, increase Sound Quality and establish a Brand Sound. Based on the historical development, different methods and current applications will be discussed and presented.



#45 Thermoacoustic instability prediction for a decarbonised future

Aimee Morgans
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Aimee Morgans is Professor of Thermofluids in the Department of Mechanical Engineering at Imperial College London. Her research interests are in aeroacoustics, thermoacoustics, aerodynamics and flow control. She studied undergraduate Engineering at Cambridge University, remaining at Cambridge for a PhD on aeroacoustics. She then held a Royal Academy of Engineering 5-year Research Fellowship in the UK, joining Imperial College as a Lecturer (Assistant Professor) in 2007. She has been at Imperial since, becoming full Professor in 2017. She has held a European Research Council (ERC) Starting Grant and an ERC Consolidator Grant, both on thermoacoustic instability. She was elected a Fellow of the UK's Royal Academy of Engineering in 2021 and awarded the Menelaus Medal by the Learned Society of Wales in 2023.

Imperial College London
Department of Mechanical Engineering
South Kensington Campus
London SW7 2AZ, UK

This talk will present research on thermoacoustic instability and how this is contributing to a decarbonised future. Thermoacoustic instability arises from a two-way interaction between acoustic waves and flame unsteadiness. It leads to damaging oscillations, and the shift to carbon-free fuels such as hydrogen appears to increase propensity to it. The disparity in length scales associated with the acoustic waves and the flame promotes the use of multi-scale methods for efficient computational prediction. Being able to accurately predict instability is a key tool in being able to design it out. The talk will present some new acoustic modelling avenues, including for acoustic wave propagation in axially varying flows and for acoustic dampers. Data-driven methods which optimise geometry specifically to maximise acoustic damping will be shown, these opening up opportunities for acoustic dampers and burners in hydrogen combustors.



#46 Micro-vibration and Control of Meteorological Satellite

Guang Meng
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Prof. Dr. Meng Guang is now the Chair Professor and the Vice Chairman of the University Council of Shanghai Jiao Tong University and is also the Senior Technical Advisor of Shanghai Academy of Spaceflight Technology. His research areas are related with dynamics, vibration analysis and control, spaceflight design and manufacture. He has published 4 books, about 500 technical papers with more than 8,000 SCI citations, and 73 invention patens.
He was awarded the BS in 1982, MS in 1984 and PhD in 1988 all from North-western Polytechnical University, China, and worked as a lecture (1988) and professor (1993) in the same university from 1988 to 1996.

Shanghai Jiao Tong University
800 Dongchuan RD.
Minhang District, Shanghai, China

The spacecraft is developing towards ultra-high precision, ultra-high stability, and hyper-spectral sensing directions. Micro-vibration in satellite platform can significantly degrade the performance of payload, so that the micro-vibration analysis, control, measurement, and experiment is very important to all high-performance satellites. Considering the main vibration source on satellite and the requirement of the sensitive payload, the vibration suppression isolators are adopted to both vibration source and the sensitive payload. The parameters and sensitivity of the isolator unit is studied to give basic vibration suppression design guideline. The vibration isolation of the interferometer can be seemed as second level vibration isolation and can further reduce the vibration. The suspension system is used to fulfil the micro-vibration experiment on ground. The on-orbit vibration measurement system is carried on FY-4 satellite and the real data show that the micro-vibration level can be suppressed to meet the satellite requirement.



#65 Exploring Two Decades of Pioneering Research and Innovation in In-Ear Technologies

Jérémie Voix
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A physicist by education and acoustician by calling, Professor Jérémie Voix has more than 25 years of experience fighting against high-noise work environments. He sits on the Canadian Standards Association (CSA), and was actively involved in drafting the latest standards related to hearing protection (Z94 and Z1007) and measuring exposure to noise (Z107). He is also an active member of the American National Standard Institute (ANSI), and is responsible for the latest standard on fit tests for hearing protectors (ANSI S12.71). Since 2018, he has been involved in the "Make Listening Safe" initiative, under the auspices of the World Health Organization (WHO).
Professor Voix is President of the Canadian Acoustical Association, Associate Member of the International Laboratory for Brain, Music and Sound Research (BRAMS) and Associate Director, Scientific and Technological Research for the Centre for Interdisciplinary Research in Music Media and Technology (CIRMMT), housed at the Schulich School of Music at McGill University, where he is also a Visiting Professor.

École de technologie supérieure
1100, rue Notre-Dame Ouest
Montréal (Qc), Canada

This article outlines the journey of a researcher engaged in a successful university-industry collaboration focused on in-ear technologies. The joint research between ÉTS and Sonomax/EERS over the years has resulted in numerous publications and utility patents and has established EERS as a key player in the global "hearables" market. The collaboration between the university and industry has not only propelled research and innovation, trained over 150 researchers, but also fostered a unique and lucrative partnership model for the benefit of both parties. The article delve into some of the "behind the scenes" elements of the collaboration, providing insights into the dynamics and strategies that contributed to its success.



#66 Sensing Sound and Vibration at the Speed of Light – Distributed Acoustic Sensing (DAS) Technology

Venugopalan Pallayil
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Venugopalan Pallayil earned a post graduate degree in physics and a PhD in Microwave Electronics both from the Cochin University of Science and Technology (CUSAT) in 1981 and 1992 respectively. He served as an R&D Scientist in the Defence Research and Development Organisation (DRDO) in India for 11 years before moving to Singapore in 1998 to take up a Research Fellow position at the National University of Singapore (NUS). He is currently a Principal Research Fellow and Deputy Head at the Acoustic Research Laboratory, Tropical Marine Science Institute, National University of Singapore (NUS). He has led many successful projects while in NUS and one of his projects, Remotely Operated Mobile Ambient Noise Imaging (ROMANIS) won the prestigious Defence Technology Prize in 2004 for the best group project. He has been part of many international collaborations including Scripps Institute of Oceanography (SIO, USA), Woods Hole Oceanographic Institute (WHOI, USA), Applied Physics Laboratory, University of Washington (APL-UW, USA) and Centre for Marine Research and Experimentation (CMRE), Italy. His research activities focussed on sensing and monitoring of underwater sound and ambient noise characterisation. Recently his interest shifted to Distributed Acoustic Sensing (DAS) and will be working on a project on underwater application of DAS.
Venu Pallayil is a senior member of IEEE and serves on the Oceanic Engineering Society Executive Committee. He has also served as Vice-President of Technical Activities and is currently serving as VP for OCEANS conferences. He is a member of the Board of Directors for IIAV and also a member of the Society of Acoustics, Singapore.

National University of Singapore
12A Kent Ridge Road
Singapore 119222

Distributed Acoustic Sensing, or DAS as it is often referred to, is a novel technology that uses fiber optic cables for sensing and monitoring vibrations in any environment. The technology relies on Raleigh Scattering, an imperfection in the usual fibre optic communication cable. Its potential has been demonstrated successfully in many applications such as sensing and classifying traffic vibrations, in seismology, pipeline fault detection applications and even in underwater detection and classification of acoustic sources. Over the last couple of years this technology has caught up with many researchers because of the wide-ranging sensing capabilities and enormous volume of vibration data it can provide. Unlike traditional microphone and hydrophone arrays made of discrete sensors, long sections of the fibre optic cable can act as a dense and continuous array of thousands of vibration sensors providing exceptional spatial and temporal resolution for sensing, localising, and classification. This technology offers robust, large scale and relatively low-cost sensing solution. They are free from electromagnetic interference, no requirement of internal electronics, free from corrosion, robust to high temperature and still provide the required sensitivity. The DAS global market size is currently valued at USD 740m and set to grow to 1400m by 2028. In this talk I shall provide a review of the DAS technology and selected applications in the areas of seismology, underwater detection and localisation, rail-road traffic monitoring and other applications. The talk will also address emerging interrogator technologies for sensing and mention algorithms for handling large volumes of data and processing.



#223 Understanding the flow-induced noise sources of complex geometries through advanced aeroacoustic measurements

Danielle Moreau
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Danielle Moreau is an Associate Professor in the School of Mechanical and Manufacturing Engineering at UNSW Sydney. She obtained her PhD at the University of Adelaide in 2010 on the topic of virtual sensing for active noise control. Her current research is in the field of experimental aeroacoustics and explores the production and control of flow-induced noise. Her major research contributions have been in wall-mounted finite airfoil aeroacoustics, airfoil trailing edge noise production and control and bluff body flow noise. A/Prof Moreau is a Fulbright Scholar and the co-author of two textbooks: 'Active Control of Noise and Vibration' (Taylor and Francis) and 'Flow Noise: Theory' (Springer). She also serves as Chief Editor of Acoustics Australia and an Associate Editor of Applied Acoustics.

School of Mechanical and Manufacturing Engineering, UNSW Sydney, NSW 2052 Australia

Aeroacoustics, the sound from aerodynamic flows, is a significant noise contributor for aircraft, wind turbines, fans, UAVs, and underwater vehicles. The noise originates from the unsteady surface pressure produced by the interaction of flow structures and the surface of an object in the flow. This talk focuses on recent experimental progress towards identifying these flow structures to uncover the noise generation mechanisms in complex, three-dimensional flows. It will highlight advanced aeroacoustic experiments that have captured simultaneous measurements of the flow, far-field noise and unsteady wall pressure using techniques such as high-speed particle image velocimetry, acoustic beamforming and dense arrays of wall pressure taps with the remote microphone technique. How we analyze the experimental data to determine the chain-of-causality, linking the flow dynamics to noise emission, will be discussed. The test cases examined will include a finite wall-mounted cylinder immersed in a pressure gradient wall boundary layer and the tip clearance flow of a low Mach number ducted propeller.


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