Journal articles: 'Acoustics and physics'

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Godin, Oleg A., and Kay L. Gemba. "Graduate programs in physical, engineering, and underwater acoustics at the Naval Postgraduate School." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A122. http://dx.doi.org/10.1121/10.0015752.

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The Departments of Physics and of Electrical and Computer Engineering at the Naval Postgraduate School offer graduate programs in acoustics leading to MS and PhD degrees in applied physics and engineering acoustics. Engineering acoustics degrees can be completed in either traditional or distance learning modes. The departments also offer stand-alone academic certificate programs in fundamentals of engineering acoustics, underwater acoustics, and sonar system applications, with a set of three certificates leading to a MS degree in engineering acoustics. MS and PhD programs are interdisciplinary, with courses and laboratory work drawn principally from the fields of physics and electrical engineering. Subjects covered include waves and oscillations; fundamentals of physical and structural acoustics; the generation, propagation, and reception of sound in the ocean; civilian and military applications of sonar systems; and acoustic signal processing. Topics of recent theses and dissertations include development and field testing of novel sensors for atmospheric and ocean acoustics, modeling and measurements of ambient noise and sound propagation in the ocean, sound scattering in underwater waveguides, acoustic vector sensors and vector field properties, acoustic communications, noise interferometry, time reversal in acoustics, geo-acoustic inversion, acoustic remote sensing of the ocean, and acoustics of autonomous underwater and aerial vehicles.

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Liang, Bin, Jian-chun Cheng, and Cheng-Wei Qiu. "Wavefront manipulation by acoustic metasurfaces: from physics and applications." Nanophotonics 7, no. 6 (June 27, 2018): 1191–205. http://dx.doi.org/10.1515/nanoph-2017-0122.

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AbstractMolding the wavefront of acoustic waves into the desired shape is of paramount significance in acoustics, which however are usually constrained by the acoustical response of naturally available materials. The emergence of acoustic metamaterials built by assembling artificial subwavelength elements provides distinct response to acoustic waves unattainable in nature. More recently, acoustic metasurfaces, a class of metamaterials with a reduced dimensionality, empower new physics and lead to extended functionalities different from their three-dimensional counterparts, enabling controlling, transmitted or reflected acoustic waves in ways that were not possible before. In this review paper, we present a comprehensive view of this rapidly growing research field by introducing the basic concepts of acoustic metasurfaces and the recent developments that have occurred over the past few years. We review the interesting properties of acoustic metasurfaces and their important functionalities of wavefront manipulation, followed by an outlook for promising future directions and potential practical applications.

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Banerjee, Sourav. "Tuneable phononic crystals and topological acoustics." Open Access Government 42, no. 1 (April 15, 2024): 252–53. http://dx.doi.org/10.56367/oag-042-11436.

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Tuneable phononic crystals and topological acoustics Sourav Banerjee, Professor from the University of South Carolina, navigates the field of tuneable phononic crystals and topological acoustics. Acoustics, an age-old field of study, has recently revealed new physics with new degrees of freedom of wave propagation. These new findings are invaluable for information processing using acoustic modality. Information processing using acoustics is called acoustic computing. Computing Boolean algebra, which has already been demonstrated, could pave the pathways even for quantum computing using acoustics. Not in the very distant future, the recently discovered quantum and topological behavior of acoustics could be an integral part of computing modalities.

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Markham, Benjamin E. "An expanding pipeline: 20 + years of Acentech internships." Journal of the Acoustical Society of America 154, no. 4_supplement (October 1, 2023): A18. http://dx.doi.org/10.1121/10.0022643.

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Acoustics interns at Acentech, a multidisciplinary acoustics, technology, and noise & vibration control consultancy based in Cambridge, Massachusetts, USA, have included undergraduate and graduate students as well as graduates in many fields of engineering, physics, and architecture. Acentech interns work on a deliberate mix of both project work and internal research and development, often inspired by research presented by academics in our field. For a time, interns were typically from one of approximately a dozen US-based graduate programs in acoustic, and more rarely, from one or two undergraduate programs with acoustics concentrations. In recent years, successful interns have hailed from an increasingly wide array of university programs, and the results have exceeded expectations: an increasingly diverse pipeline of skilled, intellectually curious individuals with a passion for music, buildings, and acoustical design.

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Braasch, Jonas, Andrew A. Piacsek, and Gary Scavone. "Overview of the technical area in musical acoustics." Journal of the Acoustical Society of America 155, no. 3_Supplement (March 1, 2024): A29. http://dx.doi.org/10.1121/10.0026676.

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Musical acoustics was launched as one of the first Technical Committees of the Acoustical Society of America. The Technical Committee in Musical Acoustics (TCMU) is concerned with applying science and technology to the field of music. The four main areas are (1) physics of musical sound production in musical instruments and the voice, (2) music perception and cognition, (3) analysis and synthesis of musical sounds and compositions, and (4) recording and reproduction technology. The scopes of areas have changed over time; for example, current interests in using groundbreaking methods in artificial intelligence and computational acoustics to solve problems. There is substantial interdisciplinary overlap with other technical committees, such as Architectural Acoustics and Physiological and Psychological Acoustics. Musical acoustic studies sometimes only require relatively moderate equipment. Thus, they lend themselves well as a research entry point for undergraduate and even high school students—especially since there is often a natural interest in music from early on. However, research in the field can also become very complex and often requires cultural understanding and listening skills to interpret technical results and direct research meaningfully. On the practical side, the TCMU sometimes organizes concerts to augment the technical sessions.

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Hovem, Jens M., and Hefeng Dong. "Understanding Ocean Acoustics by Eigenray Analysis." Journal of Marine Science and Engineering 7, no. 4 (April 25, 2019): 118. http://dx.doi.org/10.3390/jmse7040118.

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Acoustics is important for all underwater systems for object detection, classification, surveillance systems, and communication. However, underwater acoustics is often difficult to understand, and even the most carefully conducted measurements may often give unexpected results. The use of theory and acoustic modelling in support of measurements is very important since theory tends to be better behaved and more consistent than experiments, and useful to acquire better knowledge about the physics principle. This paper, having a tutorial flair, concerns the use of ray modelling and in particular eigenray analysis to obtain increased knowledge and understanding of underwater acoustic propagation.

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Naify, Christina J. "Introducing the Structural Acoustics and Vibration Technical Committee." Journal of the Acoustical Society of America 155, no. 3_Supplement (March 1, 2024): A30. http://dx.doi.org/10.1121/10.0026679.

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The Structural Acoustics and Vibrations Technical Committee (TCSA) includes scientific study of vibrating structures, excited using either elastic or acoustic waves, and radiated acoustic fields from those structures. The committee members study a diverse range of physics relating to these basic phenomena, from damping and isolation, to active control, to modal response and a variety of techniques are used, including numerical modeling, analytical techniques, and experimental measurements. Due to the wide range of applications in which vibrating structures are found, TCSA is multidisciplinary, with many of our meeting sessions co-chaired across a wide range of complimentary TCs. Additionally, research fields span a range of disciplines in their practice, including industry, academia. and government. This talk will provide a brief overview into TCSA including historical highlights and future directions as well as summaries of some of the recent special sessions presented at Acoustical Society meetings.

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Lauterborn, Werner, Thomas Kurz, and Ulrich Parlitz. "Experimental Nonlinear Physics." International Journal of Bifurcation and Chaos 07, no. 09 (September 1997): 2003–33. http://dx.doi.org/10.1142/s0218127497001539.

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The review gives and account of the historical development, the current state and possible future developments of experimental nonlinear physics, with emphasis on acoustics, hydrodynamics and optics. The concepts of nonlinear time-series analysis which are the basis of the analysis of experimental outcomes from nonlinear systems are explained and recent developments pertaining to such different fields as modeling, prediction, nonlinear noise reduction, detecting determinism, synchronization, and spatio-temporal time series are surveyed. An overview is given of experiments on acoustic cavitation, a field rich of nonlinear phenomena such as nonlinear oscillations, chaotic dynamics and structure formation, and one of the first physical systems to exhibit period-doubling and chaos in experiment.

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Larraza, Andrés, and Bruce Denardo. "Acoustics 1996: Acoustic waveguides as tools in fundamental nonlinear physics." Journal of the Acoustical Society of America 101, no. 1 (January 1997): 27–28. http://dx.doi.org/10.1121/1.419505.

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KALTENBACHER, MANFRED. "COMPUTATIONAL ACOUSTICS IN MULTI-FIELD PROBLEMS." Journal of Computational Acoustics 19, no. 01 (March 2011): 27–62. http://dx.doi.org/10.1142/s0218396x11004286.

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We present physical/mathematical models base on partial differential equations (PDEs) and efficient numerical simulation schemes based on the Finite Element (FE) method for multi-field problems, where the acoustic field is the field of main interest. Acoustics, the theory of sound, is an emerging scientific field including disciplines from physics over engineering to medical science. We concentrate on the following three topics: vibro-acoustics, aero-acoustics and high intensity focused ultrasound. For each topic, we discuss the physical/mathematical modeling, efficient numerical schemes and provide practical applications.

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Brown, David A., John R. Buck, and Paul J. Gendron. "Acoustics at UMass Dartmouth." Journal of the Acoustical Society of America 155, no. 3_Supplement (March 1, 2024): A253. http://dx.doi.org/10.1121/10.0027402.

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The University of Massachusetts Dartmouth has a long history spanning 5 decades of graduate courses offerings and research in underwater acoustics, transduction and signal processing leading to M.S. and Ph.D. degrees in Electrical Engineering. Collaborations between Marine Science, Physics, Mechanical, Bioengineering, and Electrical Engineering departments offer many interdisciplinary opportunities in Acoustics. Courses include Fundamentals of Acoustics, Vibrations, Underwater Acoustics, Electroacoustic Transducers, Medical Ultrasonics, Sonar, Digital Signal Processing, Array Processing, Random Signals, Information Theory, Communications, Detection and Estimation. Many unique facilities including an Underwater Acoustic Test Tank, Open-Ocean water access, and Unmanned Underwater Vehicles support both undergraduate and graduate projects. Research focuses include transducers and transduction science, materials characterization, calibration, array and sonar signal processing, animal bioacoustics, communications, detection and estimation, active and passive sonar funded by Office of Naval Research and Industry.

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Kumar, Sanjay, and Heow Pueh Lee. "Recent Advances in Acoustic Metamaterials for Simultaneous Sound Attenuation and Air Ventilation Performances." Crystals 10, no. 8 (August 7, 2020): 686. http://dx.doi.org/10.3390/cryst10080686.

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In the past two decades, acoustic metamaterials have garnered much attention owing to their unique functional characteristics, which are difficult to find in naturally available materials. The acoustic metamaterials have demonstrated excellent acoustical characteristics that paved a new pathway for researchers to develop effective solutions for a wide variety of multifunctional applications, such as low-frequency sound attenuation, sound wave manipulation, energy harvesting, acoustic focusing, acoustic cloaking, biomedical acoustics, and topological acoustics. This review provides an update on the acoustic metamaterials’ recent progress for simultaneous sound attenuation and air ventilation performances. Several variants of acoustic metamaterials, such as locally resonant structures, space-coiling, holey and labyrinthine metamaterials, and Fano resonant materials, are discussed briefly. Finally, the current challenges and future outlook in this emerging field are discussed as well.

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Wei, Rong‐Jue. "Acoustics and Education in Physics." Physics Today 38, no. 2 (February 1985): 9–103. http://dx.doi.org/10.1063/1.2814439.

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Sepúlveda, Camila F. Marín, Juan C. Castro-Palacio, Isabel Salinas, and Juan A. Monsoriu. "Acoustic characterization of magnetic braking with a smartphone." Physics Teacher 60, no. 8 (November 2022): 706–7. http://dx.doi.org/10.1119/5.0097792.

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Smartphone sensors have shown to be adequate to perform physics experiments in high school and first-year university physics courses. The published work covers a wide range of topics within general physics such as linear and circular motions, oscillations, beats, acoustics, and optics, among others. The microphone and speakers have been particularly useful for studying sound phenomena, such as the determination of the speed of sound, the study of acoustic beats, or the Doppler effect.

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Badiey, Mohsen, Jhon A. Castro-Correa, and Christian D. Escobar-Amado. "An overview of physics-based data science techniques in ocean acoustics." Journal of the Acoustical Society of America 155, no. 3_Supplement (March 1, 2024): A45. http://dx.doi.org/10.1121/10.0026743.

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Scientific applications in ocean acoustics include inversion, signal detection, seabed classification, source localization, and environmental assessment. Traditionally, addressing these problems commonly rely on modeling, deterministic setups, or optimization methods. However, these solutions encounter challenges when faced with non-ideal data or experimental conditions, leading to ill-posed problems or assumptions that deviate from reality. Through a new approach in recent years the integration of data science and machine learning techniques has emerged as a promising solution across various research fields. Only recently have these methodologies been introduced to the field of ocean acoustics, offering efficient and alternative for addressing problems through data-driven approaches. This study presents a collection of techniques developed by the University of Delaware, focusing on acoustic and environmental assessment. The methodologies employed include statistical approaches like maximum entropy and data-driven methods, ranging from simpler strategies such as dictionary learning and image segmentation, to more sophisticated structures like convolutional neural networks and graph neural networks, the latter can exploit spatial information in the data. The results obtained from these diverse methods offer valuable insight, paving the way for innovative alternatives to physics-based problem-solving in ocean acoustics.

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Agarwal, Vinayak, James Traer, and Joshua H. McDermott. "Human perception of impact sounds suggests auditory intuitive physics." Journal of the Acoustical Society of America 155, no. 3_Supplement (March 1, 2024): A307. http://dx.doi.org/10.1121/10.0027604.

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Upon hearing objects collide, humans can estimate many of the underlying physical attributes, such as the objects’ material and mass. Although the physics of sound generation are well established, the inverse problem that listeners must solve – of inferring physical parameters from sound – remains poorly understood. In this work, we show that humans leverage an understanding of acoustical physics to constrain their perceptual inferences, allowing them to disambiguate multiple object properties from a single impact sound. We derived a linear generative model of impact sounds, combining theoretical acoustics with empirically measured statistics of object resonances. We used an analysis-by-synthesis algorithm to infer mode parameters from recorded object impulse responses. We then fit distributions to these parameters, from which object impulse responses could be sampled. Perceptual experiments demonstrated that humans could judge material and mass from sound alone, even when both of the underlying objects varied. However, performance with synthetic sounds was impaired if the simulated physical regularities were altered to be unnatural. The results suggest that listeners use internal physical models to separate the acoustic contributions of the objects that interact to create sound.

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Fonseca, William D'Andrea, Eric Brandão, Paulo H. Mareze, Viviane S. G. Melo, Roberto A. Tenenbaum, Christian dos Santos, and Dinara Paixão. "Acoustical engineering: A complete academic undergraduate program in Brazil." Journal of the Acoustical Society of America 152, no. 2 (August 2022): 1180–91. http://dx.doi.org/10.1121/10.0013570.

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Acoustics is a broad field of knowledge that extends branches all over the physics of wave phenomena, psychology, natural sciences, and engineering. It is taught, in general, as part of engineering, physics, or architecture programs, or even in graduate programs specialized in the theme. In Brazil, acoustics was taught in graduate programs, until the creation of Acoustical Engineering in 2009, at the Federal University of Santa Maria, an integral undergraduate program dedicated to acoustics, audio, and vibration (lasting ten semesters). This article presents its complete academic program, its creation process, and the professional establishment of the acoustical engineer. In the following, the program of study and subjects are elucidated and detailed, and the teaching methodologies used are also discussed. The program employs several active learning strategies, like project-based learning, aiming to transform abstract into concrete knowledge. The interaction of the university, the acoustical engineer, and society is also presented and clarified. The placement of graduates in fields and their workplaces are presented as outcomes. As a fundamental part of the engineer's formation, the infrastructure used, whether state-of-the-art or cost-effective equipment, is detailed in the context of teaching and research. Finally, some of the ongoing research projects of the students are described.

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Wen, Qingwei. "Fourier transformation for acoustic: Principle & applications." Theoretical and Natural Science 10, no. 1 (November 17, 2023): 115–22. http://dx.doi.org/10.54254/2753-8818/10/20230326.

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A The Fourier transform has a wide range of applications in daily life, including physics, signal processing, acoustics etc. The topic of this article is to demonstrate the principle and applications of the Fourier transform in acoustics through theoretical derivation. The paper first derived the basic formula of the Fourier Transform and the related seven theorems. Then the paper detailed the research of Fourier Transform in underwater acoustic pulse signal detection technology. Finally, the application of Fourier Transform in the defect detection algorithm of MEMS acoustic films was detailed. According to the analysis, the paper demonstrated the primary application of Fourier Transform in underwater acoustic pulse signal detection and defect detection algorithm of MEMS acoustic film. Based on the evaluations, this study demonstrated the general application scenario of Fourier Transform and offered theoretical basis of its application in acoustic field, which promotes its developmental potential in the acoustic field. Overall, these results shed light on guiding further exploration of acoustic research.

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Gough, Colin. "Acoustics: The physics of vibrating strings." Physics Bulletin 36, no. 5 (May 1985): 196–97. http://dx.doi.org/10.1088/0031-9112/36/5/014.

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Rossing, Thomas D. "Should every physics student study acoustics?" Journal of the Acoustical Society of America 106, no. 4 (October 1999): 2169. http://dx.doi.org/10.1121/1.428146.

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Filippi, P., D. Habault, J. P. Lefebvre, A. Bergassoli, and Richard Raspet. "Acoustics: Basic Physics, Theory and Methods." Journal of the Acoustical Society of America 108, no. 2 (August 2000): 470. http://dx.doi.org/10.1121/1.429574.

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Neilsen, Tracianne B., and Kent L. Gee. "Using acoustics to enhance physics education." Journal of the Acoustical Society of America 134, no. 5 (November 2013): 4015. http://dx.doi.org/10.1121/1.4830647.

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Filippi, Paul, Dominique Habault, Jean‐Pierre Lefebvre, Aimé Bergassoli, and Victor W. Sparrow. "Acoustics: Basic Physics, Theory, and Methods." Physics Today 52, no. 11 (November 1999): 68–69. http://dx.doi.org/10.1063/1.882888.

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Mobley, Joel, Cecille Labuda, Likun Zhang, and Joseph Gladden. "Graduate study in physical acoustics at the University of Mississippi." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A124. http://dx.doi.org/10.1121/10.0015760.

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The University of Mississippi is a PhD granting institution with an R1 Carnegie designation placing it among schools with the highest level of research activity. The Department of Physics and Astronomy at the university has a diverse range of research opportunities which includes Physical Acoustics. Our acoustics program is affiliated with the National Center for Physical Acoustics (NCPA). NCPA is an 85,000 square foot standalone facility on the campus of the University of Mississippi solely dedicated to the physics and engineering applications of acoustics. It has research groups dedicated to ultrasound, infrasound, aeroacoustics, atmospheric propagation, porous media, and ocean acoustics. Graduate students in both physics and engineering are pursuing PhD and MS degrees at NCPA, and four faculty members from the physics department have their research laboratories in the facility. In addition to acoustics, our department provides a broad range of research opportunities in other subfields. We have two groups associated with recent Nobel Prizes in Gravitation and High Energy Physics and offer additional programs in Computational Physics and Atmospheric Physics. Our faculty are involved with national and international collaborations including the Laser Interferometer Gravitational Wave Observatory (LIGO), The European Center for Particle Physics (CERN) and Fermilab.

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Moraes, Roberto Barreto de, and Deise Miranda Vianna. "The articulation between the STS Approach and Environmental Education for the contextualization of Acoustics in Physics Teaching." Journal of Physics: Conference Series 2727, no. 1 (March 1, 2024): 012019. http://dx.doi.org/10.1088/1742-6596/2727/1/012019.

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Abstract Noise pollution presents itself in an invisible, dangerous, and permanent way, with long-lasting consequences. Acoustic discomfort within the school environment affects not only human health but also the quality of verbal communication and student performance. An appropriate acoustic environment contributes to the improvement of the teaching and learning process in addition to enhancing the interpersonal relationships involved in the educational process. Moreover, it is important to introduce acoustics-related subjects, such as environmental noise, into high school science and physics syllabi. As urban noise is a global concern and scope, students may face the need to make decisions related to environmental practices in their future lives, such as those concerning comfortable sound levels. Articulating the STS Approach with Environmental Education, we seek to combine the interdisciplinary content of Acoustics with an environmental awareness that goes beyond mere conservationist reductionism. In addition to the mandatory curricular knowledge, STS Education adopts a scientific and technological education based on a social construction that is culturally and socially contextualized.

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Meissner, Mirosław. "In Memoriam. Elżbieta Maria Walerian, Ph.D., D.Sc." Archives of Acoustics 39, no. 1 (March 1, 2015): 153–54. http://dx.doi.org/10.2478/aoa-2014-0017.

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Abstract Elżbieta M. Walerian, Ph.D., D.Sc., a retired employee of the Institute of Fundamental Technological Research of the Polish Academy of Sciences (IPPT PAN), passed away after a serious illness, on the 26th December 2013. She was one of the scientific leaders in the Section of Environmental Acoustics of IPPT PAN and her career, educational and organizational activities were inseparably linked with the acoustics. Elżbieta Walerian was born on August 9th 1950 in Poznań. She graduated from the Faculty of Mathematics, Physics and Chemistry of the Adam Mickiewicz University in Poznań, receiving her Master of Science degree in the environmental acoustics in 1973. Five years later, under the supervision of Professor Ignacy Malecki, she obtained her PhD title, in the physical acoustics, in IPPT PAN in Warsaw. In 1979 she began working at the Section of Environmental Acoustics of IPPT PAN, where she dealt with the diffraction of acoustic waves and a description of the sound field produced by vehicles moving in an urban area.

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Hioka, Yusuke, Michael Kingan, and George Dodd. "Learning effect of active learning coursework in engineering acoustics course." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (August 1, 2021): 4154–65. http://dx.doi.org/10.3397/in-2021-2617.

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This paper reports the learning effect achieved by a newly developed coursework for an engineering acoustics course offered to fourth year and postgraduate engineering students at the University of Auckland, New Zealand. The course teaches fundamental knowledge that acoustical engineers need and which underpins a variety of sub-disciplines in acoustics including: fundamental physics of wave propagation, building and room acoustics, electro-acoustics, audio signal processing, and the psychology of hearing. The coursework incorporated practical active learning activities and was developed in order to help students gain understanding of complex concepts related to the room acoustics measurement and analysis. The coursework also has the goal of providing students with an introduction to some of the practical tasks which are typical of a practising acoustical engineering in New Zealand. The learning effect was measured by comparing students' performance in a quiz that was run before students commenced working on the coursework and that in the final examination and by investigating common mistakes students made in the report which was the required deliverable of the coursework. Overall, the new coursework successfully improved students' understanding of the material which it covered.

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Secundov, Alexander N., Stanley F. Birch, and Paul G. Tucker. "Propulsive jets and their acoustics." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 365, no. 1859 (May 22, 2007): 2443–67. http://dx.doi.org/10.1098/rsta.2007.2017.

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The complex flow physics challenges and asks questions regarding these challenges a wide range of jet flows found in aerospace engineering. Hence, the daunting task facing Reynolds-averaged Navier–Stokes (RANS) technology, for which the time average of the turbulent flow field is solved, is set out. Despite the clear potential of large eddy simulation (LES)-related methods and hybrid forms involving some RANS modelling, numerous current deficiencies, mostly related to the limitations of computational resources, are identified. It is concluded that currently, these limitations make LES and hybrids most useful for understanding flow physics and refining RANS technology. The use of LES in conjunction with a ray-tracing model to elucidate the physics of acoustic wave transmission in jets and thus improved RANS technology is described. It is argued that, as a stopgap measure, pure RANS simulations can be a valuable part of the design process and can now predict acoustics spectra and directivity diagrams with useful accuracy. Ultimately, hybrid RANS–LES-type methods, and then pure LES, will dominate, but the time-scales for this transition suggests that improvements to RANS technology should not be ignored.

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Larose, Eric, Ludovic Margerin, Arnaud Derode, Bart van Tiggelen, Michel Campillo, Nikolai Shapiro, Anne Paul, Laurent Stehly, and Mickael Tanter. "Correlation of random wavefields: An interdisciplinary review." GEOPHYSICS 71, no. 4 (July 2006): SI11—SI21. http://dx.doi.org/10.1190/1.2213356.

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This paper presents an interdisciplinary review of the correlation properties of random wavefields. We expose several important theoretical results of various fields, ranging from time reversal in acoustics to transport theory in condensed matter physics. Using numerical simulations, we introduce the correlation process in an intuitive manner. We establish a fruitful mapping between time reversal and correlation, which enables us to transpose many known results from acoustics to seismology. We show that the multiple-scattering formalism developed in condensed matter physics provides a rigorous basis to analyze the field correlations in disordered media. We discuss extensively the various factors controlling and affecting the retrieval of the Green’s function of a complex medium from the correlation of either noise or coda. Acoustic imaging of complex samples in the laboratory and seismic tomography of geologic structures give a glimpse of the promising wide range of applications of the correlation method.

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Cao, Jun, Fenghua Qi, Senlin Yan, and Lifa Zhang. "Design of highly-efficient acoustic waveguide couplers using impedance-tunable transformation acoustics." International Journal of Modern Physics B 34, no. 32 (November 5, 2020): 2050250. http://dx.doi.org/10.1142/s0217979220502501.

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In this paper, the theory of impedance-tunable transformation acoustics in the geometric-acoustics limit is proposed to design efficient two-dimensional acoustic waveguide couplers. By choosing suitable impedance functions in the original space, impedance matching between the transformation medium and the background medium becomes possible, and the reflection at the boundary is reduced. The theory can be used to enable efficient acoustic coupling between waveguides of different sizes and different embedded media. By selecting an appropriate impedance function and a tunable acoustic refractive index, the transformed medium in the coupler can become a simplified parameter medium, for which the bulk modulus is a constant. This makes the experiment substantially easier. The problem of a reduced coupling-efficiency at low frequencies (a deviation from the geometric acoustic approximation) can be mitigated by selecting a large acoustic refractive index. Our two-dimensional numerical simulations indicate that this theoretical design works very well. The method can be extended to other transformation acoustic designs including three-dimensional cases.

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Breazeale, M. A. "Physics and Engineering Principles of Nonlinear Acoustics." Japanese Journal of Applied Physics 27, S1 (January 1, 1988): 12. http://dx.doi.org/10.7567/jjaps.27s1.12.

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Dyer, Ira. "FORUM: Articles in acoustics for Physics Today." Journal of the Acoustical Society of America 85, no. 1 (January 1989): 506. http://dx.doi.org/10.1121/1.397706.

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Gabard, G., R. J. Astley, P. Gamallo, and G. Kennedy. "Physics-based computational methods for aero-acoustics." Procedia Engineering 6 (2010): 183–92. http://dx.doi.org/10.1016/j.proeng.2010.09.020.

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Koukounian, Viken. "“Acoustics” as a “system”—A refreshed narrative leading change in standards, codes, and guidelines." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A33. http://dx.doi.org/10.1121/10.0010566.

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Although “acoustics” is widely understood to be in relation to the person, it is—more correctly—a branch of physics that studies the behavior of mechanical energy in media. In contrast, “psychoacoustics” concerns itself with the perception (or psychology) of sound and the associated physiological effects. The disassociation is best exemplified by traditional architectural acoustical design schemes—i.e., “acceptable-level” and “categorization”—which are prevalent throughout existing Standards, Codes, and Guidelines. The result, as evidenced by the meta-analysis of modern and sustainable best practices by a group at Harvard, is an Indoor Environment Quality parameter that does not consistently score better, and in several studies, results in lower satisfaction scores with noise. This presentation presents posteriori—correlations between “occupant satisfaction” and “acoustical satisfaction,” “acoustical satisfaction” and “acoustical privacy,” and “acoustical privacy” and “health and well-being”—to justify the pitfalls of traditional strategies, and to develop a priori—a framework for “good acoustics.” This refreshed narrative, to consider acoustics as a system, leads change among the most popular sustainability and well-being Standards, such as WELL, Green Globes, and LEED. This presentation endeavors to summarize notable updates and to identify new risks and challenges associated with recent versions of the aforementioned documents.

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Chen, Xingyu, fei ma, and Prasanga N. Samarasinghe. "Head-related transfer functions upsampling with physics-informed spherical convolutional neural network." Journal of the Acoustical Society of America 154, no. 4_supplement (October 1, 2023): A183. http://dx.doi.org/10.1121/10.0023204.

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Head-related transfer functions (HRTFs) play a crucial role in virtual acoustics and spatial audio applications. However, obtaining personalized, high-resolution HRTFs remains challenging due to the time-consuming and expensive measurements. Recently, deep learning-based methods have shown promise in predicting high-resolution HRTFs from sparse measurements. Nevertheless, most of these methods often treat HRTF upsampling as an image super-resolution task, which overlooks critical spatial information and acoustic principles, leading to overfitting on datasets. This paper proposes a physics-informed spherical convolutional neural network for HRTF upsampling. First, spherical convolutional layers are used to capture spatial features on the sphere, allowing efficient handling of spherical sampled HRTF data. Second, in the upsampling process, the proposed method incorporates the Helmholtz equation as a constraint, adhering tothe physics of the acoustic system. This method ensures the generation of physically feasible HRTF interpolations, thus promoting better generalization.

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Cowern, Dianna L. "Physics girl experience—Using YouTube to teach acoustics and wave physics." Journal of the Acoustical Society of America 140, no. 4 (October 2016): 3314. http://dx.doi.org/10.1121/1.4970555.

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Orzolek, Douglas C., and Shelley A. Blilie. "Teaching Room Acoustics." Physics Teacher 60, no. 7 (October 2022): 554–56. http://dx.doi.org/10.1119/5.0038523.

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Like many other universities, Musical Acoustics is offered at our school as a lab-based course fulfilling general science requirements for non-majors. The course has been team-taught by a physics professor and music professor since its earliest inception and, by far, the most popular unit explores room acoustics through a variety of activities and experiences. The purpose of this article is to share the ways we engage students in the process of learning the conceptual elements related to room acoustics.

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Barati, H., Z. Basiri, and A. Abdolali. "Acoustic Multi Emission Lens via Transformation Acoustics." Chinese Physics Letters 35, no. 10 (October 2018): 104301. http://dx.doi.org/10.1088/0256-307x/35/10/104301.

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Chen, Huanyang, and C. T. Chan. "Acoustic cloaking and transformation acoustics." Journal of Physics D: Applied Physics 43, no. 11 (March 4, 2010): 113001. http://dx.doi.org/10.1088/0022-3727/43/11/113001.

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Tournat, Vincent. "Graduate studies in acoustics and wave physics at Institut d’Acoustique - Graduate School, Le Mans, France." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A125. http://dx.doi.org/10.1121/10.0015766.

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This poster presents the graduate studies in Acoustics at Le Mans (France) offered at the “Institut d’Acoustique - Graduate School”. Graduate studies in Acoustics at Le Mans University have been awarded in 2018 the excellence label “École Universitaire de Recherche” among 28 other reference centers for all fields of Science, through a highly selective national call. Our master and engineering school programs range from physical acoustics, environmental acoustics, acoustics and vibrations to international masters on electro-acoustics and on wave physics. The education through research is carried out at the LAUM, UMR CNRS, one of the largest acoustics laboratory in the world. Several details, objectives, student feedbacks and contact informations on the graduates studies will be given on the poster.

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Hornowski, Tomasz. "In Memoriam: Professor Mikołaj Łabowski." Archives of Acoustics 38, no. 4 (December 1, 2013): 573. http://dx.doi.org/10.2478/aoa-2013-0069.

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Abstract Mikołaj Łabowski, Professor Emeritus at the Institute of Acoustics, Adam Mickiewicz University in Poznań, passed away on the 8th of October, 2013. Professor Mikołaj Łabowski was born on the 17th of December, 1935, in Florynka in the southern part of Poland. He graduated from the Faculty of Mathematics, Physics and Chemistry of the Adam Mickiewicz University receiving his Master of Science degree in physics in 1962. Eight years later he obtained his PhD title from the same university. In 1981, on the basis of the book “Ultra- and hypersonic properties of selected liquids and critical mixtures” he obtained the degree of habilitated doctor. The President of Poland awarded him the titles of Associate Professor in Physics in the year 1991 and Full Professor in 1999. From 1985 to 1987,Mikołaj Łabowski held the post of Vice-Dean for Students’ Affairs at the Faculty of Mathematics and Physics of the AdamMickiewicz University. In the years 1996–1999, he was the Director of the University’s Institute of Acoustics. He held many posts in the Polish Acoustical Society, of which he was a HonoraryMember. He always served with advice and assistance in scientific matters to the Committee of Acoustics of the Polish Academy of Sciences. Professor Łabowski was an outstanding scientist, one of the founders of ultrasonic physics in Poland. After returning from scholarship in the Lomonsov University in Moscow, he became an expert in the field of ultrasonic studies of liquids and liquid mixtures. His groundbreaking works on ultrasonic properties of critical binary mixtures opened up new perspectives in the research of dynamic phenomena in the vicinity of critical temperatures. Professor Łabowski’s outstanding scientific achievements were recognized by rewarding him the Minister of Education Prize in the years 1981 and 1987. Throughout his whole professional career associated with the Adam Mickiewicz University in Poznań, Professor Łabowski has published over 100 papers, mostly in renowned international scientific journals, and carried out an intensive teaching activity. Through his profound knowledge and enthusiasm, Professor Mikołaj Łabowski continuously inspired colleagues and collaborators and decisively shaped the development of ultrasonic physics in Poznań. With the death of Professor Mikołaj Łabowski, Polish acoustics has lost a great researcher, teacher, and scholar.

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Long, Yang, Hao Ge, Danmei Zhang, Xiangyuan Xu, Jie Ren, Ming-Hui Lu, Ming Bao, Hong Chen, and Yan-Feng Chen. "Symmetry selective directionality in near-field acoustics." National Science Review 7, no. 6 (March 14, 2020): 1024–35. http://dx.doi.org/10.1093/nsr/nwaa040.

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Abstract Understanding unidirectional and topological wave phenomena requires the unveiling of intrinsic geometry and symmetry for wave dynamics. This is essential yet challenging for the flexible control of near-field evanescent waves, highly desirable in broad practical scenarios ranging from information communication to energy radiation. However, exploitations of near-field waves are limited by a lack of fundamental understanding about inherent near-field symmetry and directional coupling at sub-wavelengths, especially for longitudinal waves. Here, based on the acoustic wave platform, we show the efficient selective couplings enabled by near-field symmetry properties. Based on the inherent symmetry properties of three geometrically orthogonal vectors in near-field acoustics, we successfully realize acoustic Janus, Huygens, spin sources and quadrupole hybrid sources, respectively. Moreover, we experimentally demonstrate fertile symmetry selective directionality of those evanescent modes, supported by two opposite meta-surfaces. The symmetry properties of the near-field acoustic spin angular momenta are revealed by directly measuring local vectorial fields. Our findings advance the understanding of symmetries in near-field physics, supply feasible approaches for directional couplings, and pave the way for promising acoustic devices in the future.

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Pierce, A. D. "Computational acoustics: ocean-acoustic models and supercomputing: computational acoustics; scattering, Gaussian beams, and aeroacoustics: computational acoustics; seismo-ocean acoustics and modeling." Journal of Sound and Vibration 149, no. 3 (September 1991): 533–34. http://dx.doi.org/10.1016/0022-460x(91)90462-s.

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Rossing, Thomas D. "Musical acoustics: A bridge between physics and music." Journal of the Acoustical Society of America 101, no. 5 (May 1997): 3098. http://dx.doi.org/10.1121/1.419337.

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Ludwigsen, Daniel. "Acoustics in a physics program in the 1990s." Journal of the Acoustical Society of America 139, no. 4 (April 2016): 2180. http://dx.doi.org/10.1121/1.4950480.

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Thomas, Derek C., and Benjamin Y. Christensen. "Using Python to teach mathematics, physics, and acoustics." Journal of the Acoustical Society of America 135, no. 4 (April 2014): 2159. http://dx.doi.org/10.1121/1.4877003.

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Brown, David A. "Waves and fun acoustics." Journal of the Acoustical Society of America 153, no. 3_supplement (March 1, 2023): A360. http://dx.doi.org/10.1121/10.0019161.

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The presenter shares some experience with teachings and demonstration on waves, vibrations, and sound from classroom visits at kindergarten lovel, after school elementry school science enrichment, high school AP physics, to required graduate course in Acoustic and Electromagetic waves. Topics includestanding waves and lasagna, vibrating strings, coupled oscillators, parametric excitation, boundary conditions, effects of gravity, phonographs, and the Shive wave machine.

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Tamborini, M., N. Ludwic, and M. Giliberti. "Waves in a swimming pool: a teaching/learning path for teachers’ education." Journal of Physics: Conference Series 2297, no. 1 (June 1, 2022): 012025. http://dx.doi.org/10.1088/1742-6596/2297/1/012025.

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Abstract An innovative teaching sequence on underwater diving Physics has been experimented for nine years in a High School in Milano (Italia) to help teachers and students to build a deep comprehension of the wave phenomena. This activity involves all the 15-year-old students attending their second year in the school together with their teachers. It has been implemented under the supervision of the Milano City Police Diving Division in collaboration with the Physics Department of the University of Milan. Many Physics issues, such as optics, acoustics, heat, fluids and dynamics laws, can be explored under water. In the presented contribution the focus will be on the main features of acoustic and electromagnetic waves propagation through air and water by using common descriptors like impedance and energy. The presented proposal may be used as a case study on how to improve the physics teachers’ skills to innovate their educational approach in full autonomy.

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Zhu, Jishen. "Research progress on piezoelectric acoustic transducers: Principles, materials, performance, and applications." Journal of Physics: Conference Series 2786, no. 1 (June 1, 2024): 012016. http://dx.doi.org/10.1088/1742-6596/2786/1/012016.

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Abstract Piezoelectric acoustic transducers enable the mutual conversion between mechanical energy and electrical energy. In recent years, piezoelectric transducers, as efficient and reliable sustainable energy harvesting devices, have demonstrated unique application value in various disciplines such as physics, acoustics, and engineering. This paper comprehensively reviews the current research status and future development directions of acoustic transducers. Firstly, the physical mechanism of the piezoelectric effect is thoroughly analyzed, and the basic operating mode of piezoelectric acoustic transducers is systematically explained. Furthermore, the characteristics and design directions of different types of piezoelectric materials are comprehensively reviewed, with a focus on exploring material innovation approaches to enhance performance. Moreover, various design methods, including layered, integrated, and curved structures, are summarized with emphasis on their crucial roles in improving sensitivity and adaptability. Techniques improving performance were also reviewed. Given the unique nature of piezoelectric effect, the research outlines applications of transducers in sonar systems, structural monitoring systems, and micro-piezoelectric systems. Through the above review, this paper provides profound insights into the research on piezoelectric acoustic transducers, emphasizing in-depth investigations in specific areas. It offers researchers from backgrounds including materials science, acoustics, and electronics different directions, ideas, and methods, thereby promoting innovation in wireless, sensing, and energy fields.

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Ge, Hao, Min Yang, Chu Ma, Ming-Hui Lu, Yan-Feng Chen, Nicholas Fang, and Ping Sheng. "Breaking the barriers: advances in acoustic functional materials." National Science Review 5, no. 2 (December 26, 2017): 159–82. http://dx.doi.org/10.1093/nsr/nwx154.

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Abstract Acoustics is a classical field of study that has witnessed tremendous developments over the past 25 years. Driven by the novel acoustic effects underpinned by phononic crystals with periodic modulation of elastic building blocks in wavelength scale and acoustic metamaterials with localized resonant units in subwavelength scale, researchers in diverse disciplines of physics, mathematics, and engineering have pushed the boundary of possibilities beyond those long held as unbreakable limits. More recently, structure designs guided by the physics of graphene and topological electronic states of matter have further broadened the whole field of acoustic metamaterials by phenomena that reproduce the quantum effects classically. Use of active energy-gain components, directed by the parity–time reversal symmetry principle, has led to some previously unexpected wave characteristics. It is the intention of this review to trace historically these exciting developments, substantiated by brief accounts of the salient milestones. The latter can include, but are not limited to, zero/negative refraction, subwavelength imaging, sound cloaking, total sound absorption, metasurface and phase engineering, Dirac physics and topology-inspired acoustic engineering, non-Hermitian parity–time synthetic active metamaterials, and one-way propagation of sound waves. These developments may underpin the next generation of acoustic materials and devices, and offer new methods for sound manipulation, leading to exciting applications in noise reduction, imaging, sensing and navigation, as well as communications.

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Journal articles on the topic 'Acoustics and physics'

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