Relevant bibliographies by topics / Acoustical engineering

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Acoustical engineering'

Author: Grafiati
Published: 4 June 2021
Last updated: 29 July 2024

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Journal articles on the topic "Acoustical engineering"

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Burkhard, Mahlon D. "Acoustical standards in engineering acoustics." Journal of the Acoustical Society of America 115, no. 5 (May 2004): 2434. http://dx.doi.org/10.1121/1.4781590.

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Haberman, Michael R. "Introduction to the Technical Committee on Engineering Acoustics." Journal of the Acoustical Society of America 155, no. 3_Supplement (March 1, 2024): A29. http://dx.doi.org/10.1121/10.0026675.

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This talk will introduce ongoing work in the Technical Committee on Engineering Acoustics (TCEA) of the Acoustical Society of America. Engineering Acoustics encompasses the theory and practice of creating tools to generate and investigate acoustical phenomena and then to apply the knowledge of acoustics to practical utility. This includes the design and modeling of acoustical and vibrational transducers, transducer arrays, and transduction materials or systems in all media and frequency ranges. It is also concerned with the design of acoustical instrumentation, metrology, and the calibration of those systems. It further considers all aspects of measurement, fabrication, and computational techniques as they relate to acoustical phenomena and their utility. The talk will provide an introduction of a broad range of research topics in TCEA, with specific highlights on exciting new areas of research.
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Molevich, Nonna E., Anatoly I. Klimov, and Vladimir G. Makaryan. "Influence of Thermodynamic Nonequilibrium on the Acoustic Properties of Gases." International Journal of Aeroacoustics 4, no. 3 (July 2005): 373–83. http://dx.doi.org/10.1260/1475472054771411.

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This paper is a brief review of results of experimental and theoretical studies in the field of acoustics of nonequilibrium gas-plasma media. New acoustical properties of nonequilibrium media caused by the change in sign of the second viscosity and the dispersion coefficients are considered. Such media are acoustically active. Conditions are discussed for generating new nonlinear acoustical structures.
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Van Uffelen, Lora, James H. Miller, and Gopu R. Potty. "Underwater acoustics and ocean engineering at the University of Rhode Island." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A124. http://dx.doi.org/10.1121/10.0015761.

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Underwater acoustics is one of the primary areas of emphasis in the Ocean Engineering Department at the University of Rhode Island, the first Ocean Engineering program in the United States. The program offers Bachelors, Masters (thesis and non-thesis options) and PhD degrees in Ocean Engineering. These programs are based at the Narragansett Bay campus, providing access to a living laboratory for student learning. Some key facilities of the program are an acoustics tank and a 100-foot-long wave tank. At the graduate level, students are actively involved in research focused in areas such as acoustical oceanography, propagation modeling, geoacoustic inversion, marine mammal acoustics, ocean acoustic instrumentation, and transducers. An overview of classroom learning and ongoing research will be provided, along with information regarding the requirements of entry into the program.
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Brown, David A., Paul J. Gendron, and John R. Buck. "Graduate education in acoustic engineering, transduction, and signal processing University of Massachusetts Dartmouth." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A123. http://dx.doi.org/10.1121/10.0015756.

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The University of Massachusetts Dartmouth has an established graduate program of study with a concentration in Applied Acoustics leading to the M.S. and Ph.D. degree in Electrical Engineering. The program offers courses and research opportunities in the area of electroacoustic transduction, underwater acoustics, and signal processing. Courses include the Fundamentals of Acoustics, Random Signals, Underwater Acoustics, Introduction to Transducers, Electroacoustic Transduction, Medical Ultrasonics, Digital Signal Processing, Detection Theory, and Estimation Theory. The ECE department established the university’s indoor underwater acoustic test and calibration facility which is one of the largest academic facilities supporting undergraduate and graduate thesis and sponsored research. The department has collaborations with many marine acoustic related companies including nearby Naval Undersea Warfare Center in Newport, RI and Woods Hole Oceanographic Institute in Cape Cod, MA. The presentation will highlight recent theses and dissertations, course offerings, and industry and government collaborations that support acoustical engineering, transduction, and signal processing.
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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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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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Boot, Tim, Frederic Roskam, Phil Coleman, Simon Brown, and Julien Laval. "Greater artistic and technological performance through the converged technologies of architectural acoustics, electroacoustic enhancement, and immersive audio technologies." Journal of the Acoustical Society of America 154, no. 4_supplement (October 1, 2023): A168. http://dx.doi.org/10.1121/10.0023155.

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Producing meaningful, creative, and engaging experiences for audiences requires highly integrated acoustics and audio technologies. The fields of architectural acoustics, electro acoustic enhancement and immersive audio technologies have converged, altering the way we approach entertainment venue design. Globally, demand has increased for immersive audio in live and reproduced sound, and electro acoustic enhancement technologies are becoming more widespread. We will discuss how architecturally integrated end devices, multi-function signal processing, and architectural acoustical design should be optimized to create next-generation performance venues. We will use a project example that integrates sound system, acoustic enhancement, and architectural acoustics, illustrating how increasing clarity in audience with acoustic enhancement and supporting the immersive audio increases audience engagement. We will show what can be improved to elevate the experience in a converged approach. The paper will illustrate how a convergence of audio technologies, infrastructure, and a unified design and engineering processes is creating far greater opportunities for artistic experimentation and expression.
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Hiremath, Nandeesh, Vaibhav Kumar, Nicholas Motahari, and Dhwanil Shukla. "An Overview of Acoustic Impedance Measurement Techniques and Future Prospects." Metrology 1, no. 1 (May 11, 2021): 17–38. http://dx.doi.org/10.3390/metrology1010002.

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In order to progress in the area of aeroacoustics, experimental measurements are necessary. Not only are they required for engineering applications in acoustics and noise engineering, but also they are necessary for developing models of acoustic phenomenon around us. One measurement of particular importance is acoustic impedance. Acoustic Impedance is the measure of opposition of acoustical flow due to the acoustic pressure. It indicates how much sound pressure is generated by the vibration of molecules of a particular acoustic medium at a given frequency and can be a characteristic of the medium.The aim of the present paper is to give a synthetic overview of the literature on impedance measurements and to discuss the advantage and disadvantage of each measurement technique. In this work, we investigate the three main categories of impedance measurement techniques, namely reverberation chamber techniques, impedance tube techniques, and far-field techniques. Theoretical principles for each technique are provided along with a discussion on historical development and recent advancements for each technique.
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Wang, Zhen Jiang, and Feng Hua Lu. "The Acoustical Design of Conference Room Based on Speech Acoustic." Applied Mechanics and Materials 507 (January 2014): 127–30. http://dx.doi.org/10.4028/www.scientific.net/amm.507.127.

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Based on the the requirements of appropriate reverberation time for the speech acoustic-dominated conference room, which are stipulated in Code for architectural acoustical design of theater ,cinema and multi-use auditorium(GB/T 50356-2005), this paper is trying to redesign the conference room on the fifth floor of the college of architecture and civil engineering of Taiyuan University of Technology, on account of the problems found after the experimental measurement. And the author introduces Ecotect to simulate the redesigning plan, in the hope of providing reference to acoustical design for the speech acoustic-dominated conference room.
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Dissertations / Theses on the topic "Acoustical engineering"

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Ozgenel, Caglar Firat. "Developing A Tool For Acoustical Performance Evaluation Throughout The Design." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614066/index.pdf.

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Performance of the buildings has always been a concern for the architects. With the enhancements in the technology, it is possible to measure, analyze and evaluate the performance of an architectural design before it is built via simulation tools developed. With the evaluation of the analysis performance of the concerned space can be upgraded if simulation tools are employed throughout the design process. However, even though the simulation tools are developed for the acoustical simulation and performance analysis, it is not always simple to integrate the simulation tools to whole design process because of both specific knowledge required for the usage of the tools and the nature of the acoustical simulation tools. Within the scope of the thesis, a simulation tool, which does not require advanced knowledge on acoustics and which provides rapid feedbacks about the performance of the design for the enhancement of the performance is developed using method of image sources.
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Terry, Jonathan. "Acoustic modeling of an enclosed reverberant environment." Diss., Online access via UMI:, 2007.

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Thesis (M.S.)--State University of New York at Binghamton, Thomas J. Watson School of Engineering and Applied Science, Department of Mechanical Engineering, 2007.
Includes bibliographical references.
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Onur, Cagla. "Acoustic Tracking Of Ship Wakes." Phd thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615656/index.pdf.

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Theories about ship wake structure, bubble dynamics, acoustic propagation through bubble clouds, backscattering and target strength of bubble clouds have been investigated and related Matlab simulations have been carried on. Research has been carried on algorithms for ship wake acoustic detection and tracking. Particle filter method has been simulated with Matlab for target tracking using wake echo measurements. Simulation results are promising.
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Lévesque, Sylvain. "Acoustical imaging using wave propagation tomography." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/106041.

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Lin, Yiqiang Farouk Bakhtier. "Acoustic wave induced convection and transport in gases under normal and micro-gravity conditions /." Philadelphia, Pa. : Drexel University, 2007. http://hdl.handle.net/1860/1795.

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Rinker, Brett A. "A single-sided access simultaneous solution of acoustic wave speed and sample thickness for isotropic materials of plate-type geometry." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4585.

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Thesis (M.S.)--University of Missouri-Columbia, 2006.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on April 17, 2009) Vita. Includes bibliographical references.
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Tan, Lin. "Development of micro-acoustic devices with applications of viscous effects." Diss., Online access via UMI:, 2006.

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Abouchakra, Rabih. "Delay estimation for transform domain acoustical echo cancellation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ37254.pdf.

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Zlobec, S. "Linear predictive spectral shaping for acoustical echo cancellation." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23763.

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The purpose of this Thesis is to study adaptive acoustical echo cancellation for signals with variable-rank covariance matrices. Solutions based on the least-mean-square (LMS) algorithm are presented, with the focus being on discrete-cosine-transform-(DCT) domain finite-impulse-response (FIR) filters.
In speech-related applications, the covariance matrix of the reference signal is ten nearly singular, i.e., rank-deficient, which has the effect that some of the transform-domain tap coefficients stop adapting and effectively "freeze". During is low-rank phase, this frozen taps can retain any value without effect on the mean-square error (MSE), while the remaining taps track the evolution of the system and keep the MSE at a minimum.
When the covariance matrix becomes nonsingular, however, there are no longer any frozen coefficients, and a unique tap coefficient vector yields minimum MSE. The MSE abruptly "jumps", and convergence of the taps to the unique vector will take additional time due to the (obsolete) values of the previously frozen coefficients. To remedy the situation, one applies a method dubbed "spectral shaping".
The objective of spectral shaping is to replace, during the low-rank phase, each frozen coefficient by an estimate of the corresponding coefficient of the unique full-rank solution. This is achieved in the transform domain by a combination of forward and backward linear predictors. By using spectral shaping, the frozen coefficients are thus "prepared" to be unfrozen when the covariance matrix gains full rank, resulting in a reduced jump in the MSE.
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Kondis, Antonios 1980. "Acoustical wave propagation in buried water filled pipes." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/30199.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2005.
Includes bibliographical references (p. 145-151).
This thesis presents a comprehensive way of dealing with the problem of acoustical wave propagation in cylindrically layered media with a specific application in water-filled underground pipes. The problem is studied in two stages: First the pipe is considered to be very stiff in relation to the contained fluid and then the stiffness of the pipe and the soil are taken into account. In both cases the solution process can take into account signals of any form, generated in any point inside the pipe. The simplified method provides the basic understanding on wave propagation and noise generation in the pipe in relation to pipe radius and frequency of excitation. Following the simplified analysis, the beam forming method is discussed and applied in order to reduce the noise in the pipe. Moving on to the complete analysis of the pipe, the stiffness matrix method is used to take into account the properties of the system. The solution time is proven to be much higher in this case, but the results vary from the simplified case in many real value problems. The results of the two methods are compared in more detail and then a decision making process for the choice of method is developed. This decision process is based on the frequency of the excitation, the properties of the materials and the dimensions of the system.
by Antonios Kondis.
S.M.
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Books on the topic "Acoustical engineering"

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Olson, Harry Ferdinand. Acoustical engineering. Philadelphia, Pa. (P.O. Box 31718, Philadelphia 19147-7718): Professional Audio Journals, 1991.

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Lee, Hua. Acoustical imaging. New York: Springer US, 1991.

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Bean, Abigail. Engineering acoustics. Delhi: Global Media, 2009.

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Tortoli, Piero. Acoustical Imaging. Boston, MA: Springer US, 1996.

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Mechel, Fridolin. Room Acoustical Fields. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013.

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Jones, Joie Pierce. Acoustical Imaging. Boston, MA: Springer US, 1995.

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Benesty, Jacob. Advances in Network and Acoustic Echo Cancellation. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001.

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Jeannette, Martin, and Boston Museum of Science. Engineering is Elementary Team, eds. Kwame's sound: An acoustical engineering story. Boston, MA: Boston Museum of Science, 2005.

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Dracoulis, Georges. Acoustique architecturale & industrielle. Paris: PYC Editions, 1985.

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Apfel, Robert E. Deaf architects & blind acousticians?: A guide to the principles of sound design. New Haven, CT: Apfel Enterprises, 1998.

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Book chapters on the topic "Acoustical engineering"

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Daijun, Ouyang, Liu Jiaqi, Huang Jinli, Wu Jianchen, and Wei Mingguo. "Application of Seismic Tomography to the Hydroelectric Engineering Exploration." In Acoustical Imaging, 669–76. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2958-3_91.

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Pangraz, S., H. Simon, R. Herzer, and W. Arnold. "Non-Destructive Evaluation of Engineering Ceramics by High-Frequency Acoustic Techniques." In Acoustical Imaging, 189–95. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3692-5_20.

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Eargle, John. "Acoustical Fundamentals for the Recording Engineer." In Handbook of Recording Engineering, 1–42. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-010-9366-8_1.

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Petrella, Orsola, Giovanni Cerasuolo, Salvatore Ameduri, Vincenzo Quaranta, and Marco Laracca. "Calibration System for Multi-sensor Acoustical Systems." In Lecture Notes in Electrical Engineering, 211–21. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-04324-7_28.

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Ameduri, S., O. Petrella, V. Quaranta, G. Betta, and M. Laracca. "Multisensor Acoustical Systems: Calibration and Related Problems." In Lecture Notes in Electrical Engineering, 67–70. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00684-0_13.

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Ginevsky, A. S., Ye V. Vlasov, and R. K. Karavosov. "Supersonic Nonisobaric Turbulent Jets. Control of Aerodynamic and Acoustical Characteristics." In Foundations of Engineering Mechanics, 173–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-39914-8_7.

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Liu, Tao, Jiajia Liu, Zongmei Bai, and Ouming Liu. "Acoustical Field Modeling for Communication Through Steel Based on FDTD." In Lecture Notes in Electrical Engineering, 424–33. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8458-9_45.

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Tan, W. H., A. S. N. Amirah, S. Ragunathan, N. A. N. Zainab, A. M. Andrew, W. Faridah, and E. A. Lim. "Acoustical Analysis and Optimization for Micro-Perforated Panel Sound Absorber." In Lecture Notes in Mechanical Engineering, 587–98. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0866-7_50.

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Rienstra, S. W. "Acoustical detection of obstructions in a pipe with a temperature gradient." In Topics in Engineering Mathematics, 151–79. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1814-9_6.

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Kanade, Vijay A. "A Bio-acoustical Perceptual Sense* for Early Medical Diagnosis and Treatment." In Innovations in Computer Science and Engineering, 519–25. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2043-3_56.

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Conference papers on the topic "Acoustical engineering"

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Bellizzi, Sergio, Bruno Cochelin, Philippe Herzog, Pierre-Olivier Matte´i, and Ce´dric Pinhe`de. "Experimental Investigation of Low Frequency Noise Reduction Using a Nonlinear Vibroacoustic Absorber." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47431.

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This work deals with the energy pumping phenomenon for acoustical applications. The concept of energy pumping is to passively reduce the vibrations of a primary system by attaching to it an essentially nonlinear damped oscillator also named Nonlinear Energy Sink (NES) creating a strongly nonlinear coupling which localizes and dissipates the vibrational energy. In the context of acoustics, a vibroacoustic coupling is used. In an earlier work, we showed experimentally that a loudspeaker used as a Suspended Piston (SP) working outside its range of linearity can be used as a NES. In this work, the performance and efficiency of a SP NES is studied numerically and experimentally. The considered acoustic medium is a resonant pipe. The coupling between the pipe and the NES is ensured acoustically by a small acoustic compliance (the air in a coupling box). Various observed aspects of energy pumping are presented: behavior under sinusoidal forcing, pumping threshold, resonance capture and transient response. As a SP NES technology permits an easy control of the moving mass of the NES, the effect of this parameter is also studied.
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RETBI, M., and JD POLACK. "HOW ACOUSTICAL ENGINEERING COMPELS ARCHITECTS TO CREATIVITY." In Auditorium Acoustics 2008. Institute of Acoustics, 2023. http://dx.doi.org/10.25144/17512.

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Cai, Liang-Wu, Dacio K. Dacol, Gregory J. Orris, David C. Calvo, and Michael Nicholas. "Acoustical Scattering by Multilayer Spherical Objects Containing Electrorheological Fluid." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12508.

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Scattering is the most fundamental problem in the research on phononic crystals and acoustic metamaterials; and scattering in a three-dimensional space poses challenging issues; and yet, the most challenging of all, is the scattering by elastic objects since an acoustic wave splits into different types of waves, propagating at different speeds, when it enters an elastic object. In this paper, a unified formalism is developed to analyze the scattering of an acoustic wave by a multilayer spherical object that is made of a mixture of an arbitrary number of concentric layers of elastic and acoustic media. Using this formalism, acoustical scattering by a multilayer spherical scatterer encasing an electrorheological (ER) fluid layer in an underwater environment is studied. Numerical examples show that ER fluids can alter the scattering characteristics above the first resonant frequency, which itself can be tuned by the applied electric field.
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Vaitkus, Audrius, Viktoras Vorobjovas, Donatas Čygas, Tadas Andriejauskas, and Faustina Tuminienė. "Surface Type and Age Effects on Tyre/Road Noise Levels." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.152.

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Road surface characteristics are the core influencing factors for tyre/road noise generation mechanisms. Depending on the pavement wearing layer mixture composition, type surfaces have different acoustical properties. Acoustical parameters and acoustical behavior change over the time because of the effects of traffic and environmental conditions. Usually low noise pavements can be characterized with very good acoustical parameters but at the same time good acoustical properties deteriorates over the time. Paper presents the research study of surface type and age effects on tyre/road noise levels. Number of different age and different surface type pavements (conventional AC and SMA pavements, low noise SMA TM, TMOA and PA) were evaluated and compared in terms of acoustical performance. Analysis of CPX noise level measurement results are presented in the paper followed with the conclusions and recommendations of low noise pavement application for severe climate regions.
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Mucchi, Emiliano, Elena Pierro, and Antonio Vecchio. "Experimental Guidelines for NVH Improvements in Helicopter Vibro-Acoustic Comfort." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87383.

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The noise of helicopters has started to become an important issue and the next level technical challenge is to include new design parameters such as vibro-acoustic comfort in the design process of a modern rotorcraft. In this scenario a wide experimental campaign has been performed on a EC-135 helicopter cabin in order to assess the effectiveness of several techniques for NVH (Noise Vibration and Harshness) improvements. Vibro-acoustical modal analyses of the cabin internal and external surface as well as a pure acoustical modal analysis of the cabin enclosure have been performed in order to verify the vibro-acoustical coupling between the cabin cavity and the cabin mechanical structure. Secondly a detailed leakage point detection on the cabin walls has been carried out by a few techniques finding out possible noise sources. Through such experimental analyses, some guidelines are suggested as well as particular techniques/instrumentations in order to improve human comfort on the helicopter cabin.
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Zhang, Ning, Zhuang Li, Stanley Klemetson, and Saikiran Yadagiri. "CFD and Acoustical Analyses for Coastal Highway Erosion." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37142.

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Highway 82 is located along the Gulf of Mexico and provides one of the barriers to flood damage from wave action that occurs normally along the coastal shoreline and as a result of wave surges during stormy weather and hurricanes. When the waves break over the top of Highway 82 form the south, significant erosion damage will occur on the north side of the road instead, often resulting in destruction of the shoulder and the roadway that it supports. This results in significant maintenance cost for the State of Louisiana, loss of vital access to the coastline, and destruction of the protective barrier necessary to protect the residences and uses of the land along the Gulf of Mexico. The CFD and acoustical analyses were performed to evaluate the erosion resistance of a design configuration. The CFD simulations were conducted to investigate the weather and wave conditions and the impact on the shoulder erosion. The in-situ pressure data were recorded at several locations on and downstream of the north-side shoulder, and acoustical analyses were conducted to investigate the acoustic characteristics associated with the weather and wave conditions.
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Wang, Lily M., and Siu-Kit Lau. "Studying architectural acoustics through the University of Nebraska's Architectural Engineering Program." In 158th Meeting Acoustical Society of America. ASA, 2010. http://dx.doi.org/10.1121/1.3436574.

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Sharma, Sanjay, and Dennis Siginer. "Permeability Measurement of Orthotropic Fibers Under an Acoustic Force Field." In ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78567.

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Using the validated acoustic method of determining physical properties of porous materials, acoustical properties of the orthotropic medium is used to predict longitudinal and transverse permeability. Measurement of samples in the impedance tube is conducted using ASTM E 1050 for a frequency range of 50 Hz to 6.4 KHz. The acoustical method is shown to compute longitudinal and transverse permeability for various porosity levels. The method describes permeability prediction for carbon, glass and hybrid lay ups. Longitudinal permeability calculated from the absorption coefficient of sized and unsized fibers is found to be the same in contrast to the flow methods.
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Chevret, P., D. Vaucher De La Croix, J. P. Demars, J. Catalifaud, P. Mulocher, G. Le Compagnon, and B. Florentz. "3D Inside Vehicle Acoustical Holography." In International Body Engineering Conference & Exhibition and Automotive & Transportation Technology Congress. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2002. http://dx.doi.org/10.4271/2002-01-2228.

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Kang, Yeon June, and J. Stuart Bolton. "Optimal Design of Acoustical Foam Treatments." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0449.

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Abstract A finite element model for elastic porous materials is presented that allows for interfaces with adjacent acoustical media that are arbitrarily oriented with respect to the global coordinate system. The foam finite element is based on a complete elastic porous material theory that can account for all the three wave types known to be significant in foams. Example problems are used to illustrate the application of foam finite elements to the optimal design of a foam wedge terminating a waveguide. The wedge angle is used as a design parameter (while the wedge volume is held constant) and the performance measure is the frequency-averaged absorption coefficient.
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Reports on the topic "Acoustical engineering"

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Mareze, Paulo Henrique, Ranny L. X. N. Michalski, Olavo M. Silva, and William D'Andrea Fonseca. Resenhas de livros. William D’Andrea Fonseca, July 2020. http://dx.doi.org/10.55753/aev.v35e52.43.

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Nesta edição da revista inauguramos a seção de resenhas de livros (ou book reviews). A ideia é trazer de forma resumida o conteúdo de livros clássicos e novidades — nos assuntos relacionados com as diversas ciências que envolvem acústica e vibrações. Além disso, informações interessantes acerca dos autores serão geralmente acompanhadas, trazendo um pouco mais de contexto sobre as obras. Os livros resenhados foram: Physical Approach to Engineering Acoustics (Ronald N. Miles), Environmental and Architectural Acoustics (Z. Maekawa, J. H. Rindel e P. Lord), Acoustics: An Introduction to Its Physical Principles and Applications (Allan D. Pierce) e Fundamentals of Spherical Array Processing (Boaz Rafaely).
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Williams, Locke, Gary Bell, and Duncan Bryant. Setup and data collection process of an Acoustic Doppler Velocimeter (ADV) in a laboratory setting. Engineer Research and Development Center (U.S.), March 2022. http://dx.doi.org/10.21079/11681/43741.

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The purpose of this Coastal and Hydraulics Engineering Technical Note (CHETN) is to outline experimental set up and the data collection process of an Acoustic Doppler Velocimeter (ADV) in a laboratory setting. The Nortek Vectrino ADV will be referenced in this CHETN as will the Nortek Comprehensive Manual for Velocimeters (Nortek AS 2018). Note that Nortek no longer sells the Vectrino, but the Vector, which is similar to the Vectrino aside from only having one configuration, is available.
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Tang, Dajun, Thomas Austin, and Dezhang Chu. Three-Dimensional Acoustic in Situ Imaging of Sediments and Continuation Acoustic Imaging of Shallow Water Sediments Engineering Considerations. Fort Belvoir, VA: Defense Technical Information Center, June 1998. http://dx.doi.org/10.21236/ada348240.

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Mizrach, Amos, Michal Mazor, Amots Hetzroni, Joseph Grinshpun, Richard Mankin, Dennis Shuman, Nancy Epsky, and Robert Heath. Male Song as a Tool for Trapping Female Medflies. United States Department of Agriculture, December 2002. http://dx.doi.org/10.32747/2002.7586535.bard.

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This interdisciplinaray work combines expertise in engineering and entomology in Israel and the US, to develop an acoustic trap for mate-seeking female medflies. Medflies are among the world's most economically harmful pests, and monitoring and control efforts cost about $800 million each year in Israel and the US. Efficient traps are vitally important tools for medfly quarantine and pest management activities; they are needed for early detection, for predicting dispersal patterns and for estimating medfly abundance within infested regions. Early detection facilitates rapid response to invasions, in order to contain them. Prediction of dispersal patterns facilitates preemptive action, and estimates of the pests' abundance lead to quantification of medfly infestations and control efforts. Although olfactory attractants and traps exist for capturing male and mated female medflies, there are still no satisfactorily efficient means to attract and trap virgin and remating females (a significant and dangerous segment of the population). We proposed to explore the largely ignored mechanism of female attraction to male song that the flies use in courtship. The potential of such an approach is indicated by studies under this project. Our research involved the identification, isolation, and augmentation of the most attractive components of male medfly songs and the use of these components in the design and testing of traps incorporating acoustic lures. The project combined expertise in acoustic engineering and instrumentation, fruit fly behavior, and integrated pest management. The BARD support was provided for 1 year to enable proof-of-concept studies, aimed to determine: 1) whether mate-seeking female medflies are attracted to male songs; and 2) over what distance such attraction works. Male medfly calling song was recorded during courtship. Multiple acoustic components of male song were examined and tested for synergism with substrate vibrations produced by various surfaces, plates and loudspeakers, with natural and artificial sound playbacks. A speaker-funnel system was developed that focused the playback signal to reproduce as closely as possible the near-field spatial characteristics of the sounds produced by individual males. In initial studies, the system was tasted by observing the behavior of females while the speaker system played songs at various intensities. Through morning and early afternoon periods of peak sexual activity, virgin female medflies landed on a sheet of filter paper at the funnel outlet and stayed longer during broadcasting than during the silent part of the cycle. In later studies, females were captured on sticky paper at the funnel outlet. The mean capture rates were 67 and 44%, respectively, during sound emission and silent control periods. The findings confirmed that female trapping was improved if a male calling song was played. The second stage of the research focused on estimating the trapping range. Initial results indicated that the range possibly extended to 70 cm, but additional, verification tests remain to be conducted. Further studies are planned also to consider effects of combining acoustic and pheromonal cues.
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Gramann, Richard A. ABF Algorithms Implemented at ARL:UT, Technical Report Under Contract N00039-91-C-0082, TD No. 01A1002, FDS System Engineering and Acoustics. Fort Belvoir, VA: Defense Technical Information Center, May 1992. http://dx.doi.org/10.21236/ada252368.

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Hart, Carl. Vibration survey of Room 47 with a laser doppler vibrometer : Main Laboratory Basement, U.S. Army ERDC-CRREL. Engineer Research and Development Center (U.S.), November 2020. http://dx.doi.org/10.21079/11681/38919.

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Plans are underway to create an acousto-optic laboratory on the campus of the Cold Regions Research and Engineering Laboratory. For this purpose, existing space in the basement of the Main Laboratory will be renovated. Demanding measurement techniques, such as interferometry, require a sufficiently quiet vibration environment (i.e., low vibration levels). As such, characterization of existing vibration conditions is necessary to determine vibration isolation requirements so that highly sensitive measurement activities are feasible. To this end, existing vibro-acoustic conditions were briefly surveyed in Room 47, a part of the future laboratory. The survey measured ambient noise and ambient vertical floor vibrations. The ambient vibration environment was characterized according to generic velocity criteria (VC), which are one-third octave band vibration limits. At the time of the survey, the ambient vibration environment fell under a VC-A designation, where the tolerance limit is 2000 μin/s across all one-third octave bands. Under this condition, highly sensitive measurement activities are feasible on a vibration-isolated working surface. The conclusion of this report provides isolation efficiency requirements that satisfy VC-E limits (125 μin/s), which are necessary for interferometric measurements.
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Quinn, Meghan. Geotechnical effects on fiber optic distributed acoustic sensing performance. Engineer Research and Development Center (U.S.), July 2021. http://dx.doi.org/10.21079/11681/41325.

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Distributed Acoustic Sensing (DAS) is a fiber optic sensing system that is used for vibration monitoring. At a minimum, DAS is composed of a fiber optic cable and an optic analyzer called an interrogator. The oil and gas industry has used DAS for over a decade to monitor infrastructure such as pipelines for leaks, and in recent years changes in DAS performance over time have been observed for DAS arrays that are buried in the ground. This dissertation investigates the effect that soil type, soil temperature, soil moisture, time in-situ, and vehicle loading have on DAS performance for fiber optic cables buried in soil. This was accomplished through a field testing program involving two newly installed DAS arrays. For the first installation, a new portion of DAS array was added to an existing DAS array installed a decade prior. The new portion of the DAS array was installed in four different soil types: native fill, sand, gravel, and an excavatable flowable fill. Soil moisture and temperature sensors were buried adjacent to the fiber optic cable to monitor seasonal environmental changes over time. Periodic impact testing was performed at set locations along the DAS array for over one year. A second, temporary DAS array was installed to test the effect of vehicle loading on DAS performance. Signal to Noise Ratio (SNR) of the DAS response was used for all the tests to evaluate the system performance. The results of the impact testing program indicated that the portions of the array in gravel performed more consistently over time. Changes in soil moisture or soil temperature did not appear to affect DAS performance. The results also indicated that time DAS performance does change somewhat over time. Performance variance increased in new portions of array in all material types through time. The SNR in portions of the DAS array in native silty sand material dropped slightly, while the SNR in portions of the array in sand fill and flowable fill material decreased significantly over time. This significant change in performance occurred while testing halted from March 2020 to August 2020 due to the Covid-19 pandemic. These significant changes in performance were observed in the new portion of test bed, while the performance of the prior installation remained consistent. It may be that, after some time in-situ, SNR in a DAS array will reach a steady state. Though it is unfortunate that testing was on pause while changes in DAS performance developed, the observed changes emphasize the potential of DAS to be used for infrastructure change-detection monitoring. In the temporary test bed, increasing vehicle loads were observed to increase DAS performance, although there was considerable variability in the measured SNR. The significant variation in DAS response is likely due to various industrial activities on-site and some disturbance to the array while on-boarding and off-boarding vehicles. The results of this experiment indicated that the presence of load on less than 10% of an array channel length may improve DAS performance. Overall, this dissertation provides guidance that can help inform the civil engineering community with respect to installation design recommendations related to DAS used for infrastructure monitoring.
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Limoges, A., A. Normandeau, J. B R Eamer, N. Van Nieuwenhove, M. Atkinson, H. Sharpe, T. Audet, et al. 2022William-Kennedy expedition: Nunatsiavut Coastal Interaction Project (NCIP). Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/332085.

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The accelerating Arctic cryosphere decline severely impacts the land on which northern communities live through the presence of coastal and marine geohazards and coastal erosion, which further places the cultural heritage of coastal archaeological sites at risks. Sea ice decline also compromises the formation of polynyas, with unknown consequences for the regional ecosystems. From the 10th to the 18th of July 2022, a scientific cruise onboard the research vessel William-Kennedy allowed the collection of a suite of samples and data from the marine coastal environment of Nain, Nunatsiavut. In total, 42 surface sediment samples, 29 sediment cores, 41 conductivity-temperature-depth (CTD) profiles, 13 water samples, 24 phytoplankton nets and 13 zooplankton nets were collected. The cruise allowed the deployment of 2 moorings equipped with sediment traps in Nain Bay and within deeper offshore waters. Triangulation showed that the 2 moorings were correctly placed near their target locations. Drop camera transects were deployed in Webb Bay and at the easternmost tip of Paulmp;gt;'s Island to image the seabed and study benthic habitats. Finally, acoustic sub-bottom profiling along the entire study area allowed a high-resolution characterization of the stratigraphy of the seafloor, helped identifying locations for sediment sampling and inferring geological information about the depositional environments. The material and data collected during the research cruise will be key to 1) evaluating the productivity and dynamics of small recurring polynyas (i.e., rattles) on diverse timescales, 2) assessing marine and coastal geohazards (e.g., landslides) in relation to the deglacial history of Nain, 3) investigate the seabed geomorphology in Webb Bay and linkages with permafrost and sea-level changes and 3) conducting benthic habitat characterization. Co-led by the University of New Brunswick (UNB) and Natural Resources Canada (NRCan), this cruise was done in collaboration with the Government of Nunatsiavut, Université du Québec à Montréal, Université Laval, Dalhousie University and Memorial University, and was funded by the Natural Sciences and Engineering Research Council of Canada (NSERC) and NRCan.
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Blais-Stevens, A., A. Castagner, A. Grenier, and K D Brewer. Preliminary results from a subbottom profiling survey of Seton Lake, British Columbia. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/332277.

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Seton Lake is a freshwater fiord located in southwestern British Columbia, roughly 4 km west of Lillooet and 250 km north-northeast of Vancouver. Located in the Coast Mountains, it is an alpine lake about 22-km long and roughly 1-1.5 km wide. It is separated from nearby Anderson Lake, located to the west, by a large pre-historic rock avalanche deposit at Seton Portage. The lake stands at about 243 m above sea level and is up to about 150 m deep (BC gov., 1953). Water level is controlled by a hydroelectric dam (i.e., Seton dam) located at the eastern end of the lake. Here, the lake drains east into Seton Canal, a 5 km diversion of the flow of the Seton River, which begins at the Seton dam. The Seton Canal pushes water to the Seton Powerhouse, a hydroelectric generating station at the Fraser River, just south of the community of Sekw'el'was and confluence of the Seton River, which drains into the Fraser River at Lillooet. Seton Portage, Shalatlh, South Shalatlh, Tsal'alh (Shalath), Sekw'el'was (Cayoosh Creek), and T'it'q'et (Lillooet) are communities that surround the lake. Surrounded by mountainous terrain, the lake is flanked at mid-slope by glacial and colluvial sediments deposited during the last glacial and deglacial periods (Clague, 1989; Jakob, 2018). The bedrock consists mainly of mafic to ultramafic volcanic rocks with minor carbonate and argillite from the Carboniferous to Middle Jurassic periods (Journeay and Monger, 1994). As part of the Public Safety Geoscience Program at the Geological Survey of Canada (Natural Resources Canada), our goal is to provide baseline geoscience information to nearby communities, stakeholders and decision-makers. Our objective was to see what kind of sediments were deposited and specifically if we could identify underwater landslide deposits. Thus, we surveyed the lake using a Pinger SBP sub bottom profiler made by Knudsen Engineering Ltd., with dual 3.5 / 200 kHz transducers mounted to a small boat (see photo). This instrument transmits sound energy down through the water column that reflects off the lake bottom surface and underlying sediment layers. At the lake surface, the reflected sound energy is received by the profiler, recorded on a laptop computer, and integrated with GPS data. These data are processed to generate a two-dimensional image (or profile) showing the character of the lake bottom and underlying sediments along the route that the boat passed over. Our survey in 2022 recorded 98 profiles along Seton Lake. The red transect lines show the locations of the 20 profiles displayed on the poster. The types of sediments observed are mostly fine-grained glaciolacustrine sediments that are horizontally bedded with a subtle transition between glaciolacustrine to lacustrine (e.g., profiles A-A'; C-C'; F-F'; S-S'). Profile S-S' displays this transition zone. The glaciolacustrine sediments probably were deposited as the Cordilleran Ice Sheet retreated from the local area (~13,000-11,000 years ago; Clague, 2017) and the lacustrine sediments, after the ice receded to present-day conditions. Some of the parallel reflections are interrupted, suggesting abrupt sedimentation by deposits that are not horizontally bedded; these are interpreted as landslide deposits (see pink or blue deposits on profiles). The deposits that show disturbance in the sedimentation found within the horizontal beds are thought to be older landslides (e.g., blue arrows/deposits in profiles C-C'; E-E'; F-F'; G-G'; I-I'; J-J'; K-K'; N-N'; P-P'; Q-Q'; R-R'; T-T'; U-U'), but the ones that are found on top of the horizontally laminated sediments (red arrows/pink deposits), and close to the lake wall, are interpreted to be younger (e.g., profiles B-B'; C-C'; H-H'; K-K'; M-M'; O-O'; P-P'; Q-Q'). At the fan delta just west of Seton dam, where there was no acoustic signal penetration, it is interpreted that the delta failed and brought down coarser deposits at the bottom of the lake (e.g., profiles H-H'; M-M'; and perhaps K-K'). However, these could be glacial deposits, bedrock, or other coarser deposits. Some of the deposits that reflect poor penetration of the acoustic signal, below the glaciolacustrine sediments, could represent glacial deposits, old landslide deposits, or perhaps the presence of gas (orange arrows; e.g, B-B'; D-D'; J-J'; O-O', T-T'). The preliminary results from sub bottom profiling reveal that there are underwater landslides deposits of widely varying ages buried in the bottom of the lake. However, the exact timing of these is not known. Hence our preliminary survey gives an overview of the distribution of landslides where there seems to be a larger number of landslides recorded in the narrower eastern portion of the lake.
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Book reviews: Room Acoustics: Design and Modeling; Array Signal Processing: Concepts and Techniques; Acoustics in Building Rehabilitation; and Virtual Experiments in Mechanical Vibrations: Structural Dynamics and Signal Processing. Sociedade Brasileira de Acústica (Sobrac), December 2022. http://dx.doi.org/10.55753/aev.v37e54.201.

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In this issue, this section presents four book reviews, with the first and the last being written by the authors themselves. A novelty is that all of them are also available in English language (Portuguese versions are also available on page 101). We remind you that the reviews are written in an abbreviated and concise way to summarize the content of the books (on subjects related to the various sciences involving acoustics, vibrations, and audio) and to bring information about the authors (to further contextualize the works). We present reviews of the following books in this issue: Room Acoustics: Design and Modeling (Acústica de Salas: Projeto e Modelagem) Author: Eric Brandão | Blucher, 2016 Array Signal Processing: Concepts and Techniques Authors: Don H. Johnson and Dan E. Dudgeon | Prentice Hall, 1993. Acoustics in Building Rehabilitation (A Acústica na Reabilitação de Edifícios) Author: Jorge Patrício | Engebook, 2018 (4 ed.) Virtual Experiments in Mechanical Vibrations: Structural Dynamics and Signal Processing Authors: Bin Tang and Michael J. Brennan | Wiley, 2022 Eric Brandão, professor of the Acoustical Engineering Program (EAC) at the Federal University of Santa Maria (UFSM, Brazil), presents his book on Room Acoustics (a subject he teaches in the program) — the book was technically revised by William D’Andrea Fonseca (who is an EAC professor as well). The work won the Jabuti Prize (2017) and is in its first revised edition. Next, we have a classic, “Array Signal Processing”, by American professors Don H. Johnson and Dan E. Dudgeon, a must-read for studies on the subject that deal with mechanical or electromagnetic waves. The third book is authored by Jorge Patrício (professor in Portugal), who is a reference in Building Acoustics. Finally, we have the book “Virtual Experiments in Mechanical Vibrations: Structural Dynamics and Signal Processing”, by Bin Tang and Michael J. Brennan, who write the review of their own book (an international collaboration). We hope that reading the reviews offers an initial understanding and good impression about the studies and awakens the desire to know them in their entirety: an excellent way to expand knowledge and keep up to date in the field.
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You might also be interested in the extended bibliographies on the topic 'Acoustical engineering' for particular source types:
Journal articles Dissertations / Theses Books
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