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Journal articles on the topic 'Acoustics - Modelling'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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1

Hovem, Jens M., and Hefeng Dong. "Understanding Ocean Acoustics by Eigenray Analysis." Journal of Marine Science and Engineering 7, no. 4 (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

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2

T., Pazara. "Sound propagation modelling in a lecture hall." Scientific Bulletin of Naval Academy XXII, no. 2 (2019): 276–83. http://dx.doi.org/10.21279/1454-864x-19-i2-033.

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For lecture halls, intelligibility of speech is the most important aspect. To achieve a relative uniform distribution of sound among the listeners, a number of parameters must be taken into account. One method to speed up the design process of a lecture hall is to model the sound propagation in that room using computer acoustic software. In this paper, the authors have chosen a lecture hall from Naval Academy and made numerous simulations to discover what are the week points regarding the acoustics of this room. The acoustical parameters obtained from simulations are compared with the desired

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Vorländer, Michael. "Virtual Acoustics." Archives of Acoustics 39, no. 3 (2015): 307–18. http://dx.doi.org/10.2478/aoa-2014-0036.

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Abstract Virtual Reality (VR) systems are used in engineering, architecture, design and in applications of biomedical research. The component of acoustics in such VR systems enables the creation of audio-visual stimuli for applications in room acoustics, building acoustics, automotive acoustics, environmental noise control, machinery noise control, and hearing research. The basis is an appropriate acoustic simulation and auralization technique together with signal processing tools. Auralization is based on time-domain modelling of the components of sound source characterization, sound propagat

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Kushida, Noriyuki, and Ying-Tsong Lin. "High-performance computation toward large-scale underwater acoustics modelling." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A270. http://dx.doi.org/10.1121/10.0018814.

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The complex nature of the ocean has long presented a challenge for researchers in the field of oceanography, including in the area of underwater acoustics. As a result, significant efforts have been made to develop accurate numerical models to better understand and study the ocean. Established models such as Acoustic Toolbox and Range-dependent Acoustic Models have proven to be effective for modelling sound propagation. However, these models were designed to run on single-core computers, and there is potential to optimise their performance on modern systems. The use of General-purpose graphics

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Pinnington, R. J., and C. B. Nathanail. "Modelling auditorium acoustics with light." Applied Acoustics 40, no. 1 (1993): 21–46. http://dx.doi.org/10.1016/0003-682x(93)90019-3.

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Lokki, Tapio, Alex Southern, Samuel Siltanen, and Lauri Savioja. "Acoustics of Epidaurus – Studies With Room Acoustics Modelling Methods." Acta Acustica united with Acustica 99, no. 1 (2013): 40–47. http://dx.doi.org/10.3813/aaa.918586.

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Kirkup. "The Boundary Element Method in Acoustics: A Survey." Applied Sciences 9, no. 8 (2019): 1642. http://dx.doi.org/10.3390/app9081642.

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The boundary element method (BEM) in the context of acoustics or Helmholtz problems is reviewed in this paper. The basis of the BEM is initially developed for Laplace’s equation. The boundary integral equation formulations for the standard interior and exterior acoustic problems are stated and the boundary element methods are derived through collocation. It is shown how interior modal analysis can be carried out via the boundary element method. Further extensions in the BEM in acoustics are also reviewed, including half-space problems and modelling the acoustic field surrounding thin screens.

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Bazaras, Jonas. "INTERNAL NOISE MODELLING PROBLEMS OF TRANSPORT POWER EQUIPMENT." TRANSPORT 21, no. 1 (2006): 19–24. http://dx.doi.org/10.3846/16484142.2006.9638035.

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The acoustic analysis of transport vehicles is presented in this article. Two types of vehicles of Russian production (TEP‐60 and M62) were selected for this research. Using ANSYS/Multiphysic software acoustic noise of different power units in the engine sector was simulated. In this paper we present the modelling results of the locomotive internal noise. In ANSYS/Multiphysic anbience the problems of acoustics are solved on the basis of harmonic response analysis by providing harmonic pressure excitation (sine type) at some points of fluid structure and obtaining the pressure distribution in t

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Rindel, Jens Holger. "Room Acoustic Modelling Techniques: A Comparison of a Scale Model and a Computer Model for a New Opera Theatre." Building Acoustics 18, no. 3-4 (2011): 259–80. http://dx.doi.org/10.1260/1351-010x.18.3-4.259.

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Today most acoustic consultants are using room acoustic computer models as a basis for their acoustic design. However, room acoustic scale modelling is still being used for the design in some major projects, although the costs and the time needed are significantly larger than those related to computer modelling. Both techniques were used by the author in a project for a new opera theatre; first the acoustical design was based on computer simulations using the Odeon software, and next a 1:20 scale model was built and tested. In the paper the results obtained with the two different modelling tec

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Gay, Derek A. "Finite element modelling of steelpan acoustics." Journal of the Acoustical Society of America 123, no. 5 (2008): 3799. http://dx.doi.org/10.1121/1.2935485.

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11

Bo, Elena, Louena Shtrepi, David Pelegrín Garcia, Giulio Barbato, Francesco Aletta, and Arianna Astolfi. "The Accuracy of Predicted Acoustical Parameters in Ancient Open-Air Theatres: A Case Study in Syracusae." Applied Sciences 8, no. 8 (2018): 1393. http://dx.doi.org/10.3390/app8081393.

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Nowadays, ancient open-air theatres are often re-adapted as performance spaces for the additional historical value they can offer to the spectators’ experience. Therefore, there has been an increasing interest in the modelling and simulation of the acoustics of such spaces. These open-air performance facilities pose several methodological challenges to researchers and practitioners when it comes to precisely measure and predict acoustical parameters. Therefore this work investigates the accuracy of predicted acoustical parameters, that is, the Reverberation Time (T20), Clarity (C80) and Sound

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Sam, Alan, Marina Barbagero, Rodolfo Venegas, and Benoit Coasne. "Towards bridging nano- and macroscale acoustics of porous solids." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 3 (2023): 4448–57. http://dx.doi.org/10.3397/in_2022_0636.

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This work presents results towards the bridging of nano- and macroscale acoustics of porous solids. We use molecular dynamics (MD) simulations to estimate the mechanical parameters of a nanoporous solid. These simulations consist in applying tensile and shear deformation to a zeolite material and calculate the mechanical properties from the linear regime of the stress-strain curve. The specific outcome of the simulations are phase velocities and mechanical parameters that can be used as inputs in meso/macroscopic models. To further exemplify the proposed nano-macroscale modelling strategy, wav

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Djambazov, Georgi. "Time-Dependent Numerical Modelling of Acoustic Cavitation in Liquid Metal Driven by Electromagnetic Induction." Fluids 8, no. 3 (2023): 79. http://dx.doi.org/10.3390/fluids8030079.

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The numerically simulated method of using electromagnetic field from an alternating current is a patented method to create in liquid metal, under the conditions of resonance, acoustic waves of sufficient strength to cause cavitation and implosion of gas bubbles, leading to beneficial degassing and grain refinement. The modelling stages of electromagnetics are described below along with acoustics in liquids, bubble dynamics, and their interactions. Sample results are presented for a cylindrical container with liquid aluminium surrounded by an induction coil. The possibility of establishing acou

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de la Hoz-Torres, María L., Antonio J. Aguilar, M. Dolores Martínez-Aires, and Diego P. Ruiz. "Modelling and visualization for the analysis and comprehension of the acoustic performance of buildings through the implementation of a building information modelling–based methodology." Journal of the Acoustical Society of America 152, no. 3 (2022): 1515–27. http://dx.doi.org/10.1121/10.0013886.

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Technical and technological advances have revolutionised the architecture, engineering, and construction industries in recent decades. Building information modelling (BIM) methodology has become essential in the process of information management and the development of building projects. This study aims to analyse the potential advantages of the implementation of BIM-based models for the acquisition of theoretical and procedural knowledge about building acoustics. This procedure was implemented as part of a problem-solving exercise in Science, Technology, Engineering, and Mathematics (STEM) uni

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Segarceanu, Svetlana, George Suciu, and Inge Gavăt. "Environmental Acoustics Modelling Techniques for Forest Monitoring." Advances in Science, Technology and Engineering Systems Journal 6, no. 3 (2021): 15–26. http://dx.doi.org/10.25046/aj060303.

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16

Tung, Michael M. "Modelling acoustics on the Poincaré half-plane." Journal of Computational and Applied Mathematics 337 (August 2018): 366–72. http://dx.doi.org/10.1016/j.cam.2017.10.037.

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Steeb, Holger. "Acoustics of gas-saturated foams: Modelling comparisons." PAMM 7, no. 1 (2007): 4070001–2. http://dx.doi.org/10.1002/pamm.200700019.

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Papamoschou, Dimitri. "Modelling of noise reduction in complex multistream jets." Journal of Fluid Mechanics 834 (November 17, 2017): 555–99. http://dx.doi.org/10.1017/jfm.2017.730.

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The paper presents a low-order prediction scheme for the noise change in multistream jets when the nozzle geometry is altered from a known baseline. The essence of the model is to predict the changes in acoustics due to the redistribution of the mean flow as computed by a Reynolds-averaged Navier–Stokes (RANS) solver. A RANS-based acoustic analogy framework is developed that addresses the noise in the polar direction of peak emission and uses the Reynolds stress as a time-averaged representation of the action of the coherent turbulent structures. The framework preserves the simplicity of the L

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19

Gorska, Natalia, Egil Ona, and Rolf Korneliussen. "Acoustic backscattering by Atlantic mackerel as being representative of fish that lack a swimbladder. Backscattering by individual fish." ICES Journal of Marine Science 62, no. 5 (2005): 984–95. http://dx.doi.org/10.1016/j.icesjms.2005.03.010.

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Abstract Developing acoustic methods for the identification of fish remains a long-term objective of fisheries acoustics. The accuracy of abundance estimation may be increased when the acoustic-scattering characteristics of the fish are known, including their expected variability and uncertainty. The modelling approach is valuable during the process of interpreting multi-frequency echograms. This paper attempts to improve the understanding of sound backscattering of fish without a swimbladder, here represented by Atlantic mackerel (Scomber scombrus). Our approach includes results from modellin

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Kolářová, Zuzana, Libor Šteffek, and František Vajkay. "Computer Simulations of Room Acoustics in Sporting Facilities." Advanced Materials Research 649 (January 2013): 57–60. http://dx.doi.org/10.4028/www.scientific.net/amr.649.57.

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The paper is focused on a solution with regards to acoustic problems inside of facilities for sporting activities. The evaluation of the acoustic parameters of the interior was done within a project called "Badminton Centre with Facilities", which was part of a master thesis at the Institute of Building Structures of the Faculty of Civil Engineering, BUT Brno. The given solution and design took into account not only the requirements given by the legislation dealing with building acoustics, but the aesthetical viewpoint of the individual acoustically absorbing surfaces also. The simulations wer

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Toth, Florian, Hamideh Hassanpour Guilvaiee, and Georg Jank. "Acoustics on small scales." e & i Elektrotechnik und Informationstechnik 138, no. 3 (2021): 155–61. http://dx.doi.org/10.1007/s00502-021-00875-4.

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AbstractWe present a modelling strategy based on the finite element method to describe flexible, piezoelectric structures surrounded by a compressible fluid, including viscosity. Non-conforming interfaces based on the Mortar method are used to couple the different physical domains. Finally, we present an application example of a piezoelectrically actuated MEMS structure to illustrate the modeling procedure and the impact of viscous effects.

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22

Chan, T. M., and W. M. To. "Modelling of Scattering from Balcony Fronts." Building Acoustics 9, no. 3 (2002): 219–31. http://dx.doi.org/10.1260/135101002320815684.

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Balconies are normally used in large auditoria such as concert halls or opera houses, to increase seating capacity or to give better view for a distinguished group of the audience. When ray-tracing based computer models are applied to study the acoustical quality of these auditoria, the alteration of the sound field due to balcony fronts is normally unobservable, because of the relative small size of the balcony fronts in the auditorium. Furthermore, most diffuse reflection ray-tracing methods are not based on direct wave acoustics but on an approximation of the scattering effect. In practice,

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23

Woodhouse, Jim, David Politzer, and Hossein Mansour. "Acoustics of the banjo: theoretical and numerical modelling." Acta Acustica 5 (2021): 16. http://dx.doi.org/10.1051/aacus/2021008.

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A previous paper [Woodhouse et al., Acta Acustica 5, 15 (2021) https://doi.org/10.1051/aacus/2021009] showed acoustical measurements of an American 5-string banjo alongside similar measurements on a guitar, revealing a strong contrast in bridge admittance. Theoretical and numerical modelling is now presented to probe the physics behind this contrast. Without the bridge and strings, the banjo membrane has a rising trend of admittance associated with its modal density, and it has a distinctive pattern of sound radiation because an ideal membrane has no critical frequency. When the bridge and str

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24

Darula, R., and S. Sorokin. "Vibro-acoustics of porous materials - waveguide modelling approach." Journal of Physics: Conference Series 744 (September 2016): 012095. http://dx.doi.org/10.1088/1742-6596/744/1/012095.

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25

Richmond, Korin, Simon King, and Paul Taylor. "Modelling the uncertainty in recovering articulation from acoustics." Computer Speech & Language 17, no. 2-3 (2003): 153–72. http://dx.doi.org/10.1016/s0885-2308(03)00005-6.

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26

Tang, Yongzhuang, Qidou Zhou, Xiaowei Wang, and Zhiyong Xie. "A Computational Method for Acoustic Interaction with Large Complicated Underwater Structures Based on the Physical Mechanism of Structural Acoustics." Advances in Materials Science and Engineering 2022 (December 31, 2022): 1–18. http://dx.doi.org/10.1155/2022/3631241.

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A numerical coupling approach is proposed to fast predict the acoustic radiation from a vibrating large-complicated underwater structure. In this study, the physical mechanism of sound radiation from underwater large target is used for the first time to improve the efficiency and keep the accuracy of the numerical algorithm. Although the traditional coupled finite element method/boundary element method (FEM-BEM) is accurate, it contains a large number of boundary elements and thus requires a long computation time for large-complicated structures. The research on the physical mechanism of struc

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Svensson, Peter. "Auralization. Fundmamentals of Acoustics, Modelling, Simulation, Algorithms and Acoustic Virtual Reality by Michael Vorländer." Acta Acustica united with Acustica 94, no. 4 (2008): 643. http://dx.doi.org/10.3813/aaa.918076.

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Gonçalves, João Duarte. "An ocean acoustical ray-tracing tool based on Fermat's least time principle in real a environment." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 5 (2023): 2319–30. http://dx.doi.org/10.3397/in_2022_0332.

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Recently the Underwater Acoustics Modelling and Sonar Prediction - SeaRider tool was developed by the Portuguese Naval Academy. Based on Fermat's least-time principle, 2D and 3D models of propagation of acoustic rays in the ocean were developed. These models consist of an algebraic differential system of equations. In this work we considered additionally the possibility of calculating the trajectory, addressing the occurrence of acoustic ray reflections either on the water surface or on the ocean floor. The reflections in the boundaries were assumed specular and were modelled based on Snell's

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F. Ganji, Hamed, Viktor Kornilov, Jeroen van Oijen, Philip de Goey, and Ines Lopez Arteaga. "Assessment of The Acoustic Scattering Matrix of a Heat Exchanger Using ssCFD-LNSE Simulation." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 4 (2023): 3657–67. http://dx.doi.org/10.3397/in_2022_0514.

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The risk of thermoacoustic instability is present in any combustion appliance. The instability results from a closed loop feedback between unsteady combustion, heat-transfer and acoustic modes of the system. To predict the system acoustics all constituting elements of the appliance need to be modelled. A heat-exchanger is the element where the gas faces complex fluid dynamics and heat transfer processes. Therefore, modelling of (thermo)-acoustic properties of a heat exchanger is challenging. In this paper, a computational approach is proposed to characterize the acoustic properties of a generi

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Bergman, David R. "Differential Geometry and Acoustics: A Survey." International Journal of Acoustics and Vibration 26, no. 2 (2021): 95–102. http://dx.doi.org/10.20855/ijav.2021.26.21686.

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A connection between acoustic rays in a moving inhomogeneous fluid medium and the null geodesic of a pseudo-Riemannian manifold provides a mechanism to derive several well-known results commonly used in acoustic ray theory. Among these include ray integrals for depth dependent sound speed and current profiles commonly used in ocean and aero acoustic modelling. In this new paradigm these are derived by application of a symmetry of the effective metric tensor known as isometry. In addition to deriving well-known results, the application of the full machinery of differential geometry offers a uni

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Cabrera, Densil, Shuai Lu, Jonothan Holmes, and Manuj Yadav. "Sound Reflections in Indian Stepwells: Modelling Acoustically Retroreflective Architecture." Acoustics 4, no. 1 (2022): 227–47. http://dx.doi.org/10.3390/acoustics4010014.

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Retroreflection is rarely used as a surface treatment in architectural acoustics but is found incidentally with building surfaces that have many simultaneously visible concave right-angle trihedral corners. Such surfaces concentrate reflected sound onto the sound source, mostly at high frequencies. This study investigated the potential for some Indian stepwells (stepped ponds, known as a kund or baori/baoli in Hindi) to provide exceptionally acoustically retroreflective semi-enclosed environments because of the unusually large number of corners formed by the steps. Two cases—Panna Meena ka Kun

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Doige, A. G., and H. S. Alves. "Experimental Characterization of Noise Sources for Duct Acoustics." Journal of Vibration and Acoustics 111, no. 1 (1989): 108–14. http://dx.doi.org/10.1115/1.3269804.

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Many industrial applications involving the acoustics of ducting or piping systems require an improved description of noise sources, so that a better prediction and evaluation of system performance can be achieved. Some examples are (a) the computer simulation of intake and exhaust muffler performance, (b) the control of pressure pulsation in fluid piping systems due to control valve flow noise or reciprocating compressors, and (c) predicting pressure fluctuations in heating and air-conditioning system ductwork due to various types of fans or blowers. This paper describes two applications of a

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Eastland, Grant. "Finite difference time domain ray-based modelling of acoustic scattering for target identification and tracking." Journal of the Acoustical Society of America 152, no. 4 (2022): A252. http://dx.doi.org/10.1121/10.0016182.

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The Finite Difference Time Domain (FDTD) method has provided a powerful technique for modelling and simulation of solutions of a variety of acoustics problems. The purpose of this investigation is to present work on the development of time-domain models of acoustic scattering from targets near a flat pressure-release boundary for use in identification and tracking from a moving receiving platform. The timing from acoustic source to reception are dependent on the location dependent sound speed profile and the specular scattering points on the target. There can be multiple specular points reveal

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34

Guarnaccia, Claudio, Lamberto Tronchin, and Massimo Viscardi. "Special Issue on Modelling, Simulation and Data Analysis in Acoustical Problems." Applied Sciences 9, no. 23 (2019): 5261. http://dx.doi.org/10.3390/app9235261.

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Judd, Thomas, Stefan Weigand, and Jochen Schaal. "Noise and acoustics in complicated rooms with the sound particle method." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 4 (2021): 2665–73. http://dx.doi.org/10.3397/in-2021-2197.

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The analysis of noise and acoustics in indoor spaces is often performed with geometrical methods from the ray-tracing family, such as the sound particle method. In general, these offer an acceptable balance between physical accuracy and computational effort, but models with large numbers of objects and high levels of detail can lead to long waits for results. In this paper, we consider methods to assist with the efficient analysis of such situations in the context of the sound particle diffraction model. A modern open-plan office and a large cathedral are used as example projects. We look at s

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Summers, Jason E. "Auralization: Fundamentals of Acoustics, Modelling, Simulation, Algorithms, and Acoustic Virtual RealityAuralization: Fundamentals of Acoustics, Modelling, Simulation, Algorithms, and Acoustic Virtual RealityMichaelVorländerSpringer-Verlag, Berlin, 2008. 335 pp. $129 (hardcover). ISBN: 978-3-540-48829-3." Journal of the Acoustical Society of America 123, no. 6 (2008): 4028–29. http://dx.doi.org/10.1121/1.2908264.

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ARDID, M., J. RAMIS, V. ESPINOSA, et al. "FIRST ACTIVITIES IN ACOUSTIC DETECTION OF PARTICLES IN UPV." International Journal of Modern Physics A 21, supp01 (2006): 137–41. http://dx.doi.org/10.1142/s0217751x06033519.

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The first activities related to acoustic detection of particles by DISAO research group in the Univesitat Politècnica de València are described. We are applying some techniques from physic, engineering and oceanographic acoustics to face the high energy neutrino underwater acoustic detection challenge. The work is focused mainly in two topics: design, characterization and calibration of hydrophones, and simulation of the propagation of the signal in the sea. We present also some examples for these two topics: piezoelectric modelling and transducer simulation, calibration of hydrophones using M

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Sun, Wenjing, David J. Thompson, Zhanfei Zhang, and Giacomo Squicciarini. "A practical approach to modelling railway vehicle interior acoustics." Applied Acoustics 200 (November 2022): 109055. http://dx.doi.org/10.1016/j.apacoust.2022.109055.

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Yadav, Suman, and Ram Krishna Mehta. "Modelling of magnetostrictive vibration and acoustics in converter transformer." IET Electric Power Applications 15, no. 3 (2021): 332–47. http://dx.doi.org/10.1049/elp2.12025.

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Joly, Nicolas. "Finite element modelling of thermoviscous acoustics in closed cavities." Journal of the Acoustical Society of America 123, no. 5 (2008): 3292. http://dx.doi.org/10.1121/1.2933681.

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Murphy, D. T., and D. M. Howard. "Modelling and directionally encoding the acoustics of a room." Electronics Letters 34, no. 9 (1998): 864. http://dx.doi.org/10.1049/el:19980642.

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Joly, Nicolas, and Petr Honzík. "Numerical Modelling of Boundary Layers and Far Field Acoustic Propagation in Thermoviscous Fluid." Acta Acustica united with Acustica 105, no. 6 (2019): 1137–48. http://dx.doi.org/10.3813/aaa.919392.

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To model linear acoustics in a thermoviscous fluid in open domain and time-harmonic regime, a Finite Element formulation in a bounded meshed domain is combined with the integral representation of the field for the propagative solution. The integrals are non-singular and involve the only Finite Element node values for temperature variation and particle velocity variables. To overcome the non-uniqueness of solutions at fictitious resonant frequencies, a Burton-Miller combination of integral representation is used. This formulation is suitable to compute acoustic radiation, scattering and diffrac

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Godø, Olav Rune, Nils Olav Handegard, Howard I. Browman, et al. "Marine ecosystem acoustics (MEA): quantifying processes in the sea at the spatio-temporal scales on which they occur." ICES Journal of Marine Science 71, no. 8 (2014): 2357–69. http://dx.doi.org/10.1093/icesjms/fsu116.

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Abstract Sustainable management of fisheries resources requires quantitative knowledge and understanding of species distribution, abundance, and productivity-determining processes. Conventional sampling by physical capture is inconsistent with the spatial and temporal scales on which many of these processes occur. In contrast, acoustic observations can be obtained on spatial scales from centimetres to ocean basins, and temporal scales from seconds to seasons. The concept of marine ecosystem acoustics (MEA) is founded on the basic capability of acoustics to detect, classify, and quantify organi

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Licitra, Gaetano, Antonino Moro, Luca Teti, Alessandro Del Pizzo, and Francesco Bianco. "Modelling of acoustic ageing of rubberized pavements." Applied Acoustics 146 (March 2019): 237–45. http://dx.doi.org/10.1016/j.apacoust.2018.11.009.

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Quintino, Victor, Rosa Freitas, Renato Mamede, et al. "Remote sensing of underwater vegetation using single-beam acoustics." ICES Journal of Marine Science 67, no. 3 (2009): 594–605. http://dx.doi.org/10.1093/icesjms/fsp251.

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Abstract Quintino, V., Freitas, R., Mamede, R., Ricardo, F., Rodrigues, A. M., Mota, J., Pérez-Ruzafa, Á., and Marcos, C. 2010. Remote sensing of underwater vegetation using single-beam acoustics. – ICES Journal of Marine Science, 67: 594–605. A single-beam, acoustic, ground-discrimination system (QTC VIEW, Series V) was used to study the distribution of underwater macrophytes in a shallow-water coastal system, employing frequencies of 50 and 200 kHz. The study was conducted in Mar Menor, SE Spain, where the expansion of Caulerpa prolifera has contributed to the silting up of the superficial s

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Jakic, Nina, Kristina Kiesel, and Ardeshir Mahdavi. "Exploring the Potential of Simulation Model Calibration an Acoustical Retrofit Case Study." Applied Mechanics and Materials 887 (January 2019): 561–68. http://dx.doi.org/10.4028/www.scientific.net/amm.887.561.

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The success of gastronomic facilities is due, not in a small part, to perceived indoor atmosphere. This includes not just the interior design but also lighting and acoustics. Especially acoustics is a crucial parameter concerning the perception of the environment, but it is often neglected. The present case study investigates the usability and accuracy of acoustics simulation as applied to the retrofit project of a restaurant. The restaurant space was modelled in CAD-based modelling environment. Subsequently, acoustical simulations based on ray tracing were conducted and the simulation model w

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Oldham, D. J., Jian Kang, and M. W. Brocklesby. "Modelling the Acoustical and Airflow Performance of Simple Lined Ventilation Apertures." Building Acoustics 12, no. 4 (2005): 277–92. http://dx.doi.org/10.1260/135101005775219139.

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The pressure differences that can be used to drive a natural ventilation system are very small and thus large apertures are required to allow sufficient air to enter and leave a building to ensure good air quality or thermal comfort. Large apertures are potential acoustic weak points on a façade and may require some form of acoustic treatment such as absorbent linings, in which case the ventilator is similar to a short section of lined duct. In ducts, the performance of absorbent linings increases with the length of lining and the ratio of the length of lined perimeter to the cross sectional a

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Scalo, Carlo, Sanjiva K. Lele, and Lambertus Hesselink. "Linear and nonlinear modelling of a theoretical travelling-wave thermoacoustic heat engine." Journal of Fluid Mechanics 766 (February 5, 2015): 368–404. http://dx.doi.org/10.1017/jfm.2014.745.

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AbstractWe have carried out three-dimensional Navier–Stokes simulations, from quiescent conditions to the limit cycle, of a theoretical travelling-wave thermoacoustic heat engine (TAE) composed of a long variable-area resonator shrouding a smaller annular tube, which encloses the hot (HHX) and ambient (AHX) heat exchangers, and the regenerator (REG). Simulations are wall-resolved, with no-slip and adiabatic conditions enforced at all boundaries, while the heat transfer and drag due to the REG and HXs are modelled. HHX temperatures have been investigated in the range 440–500 K with the AHX temp

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Aslan, Fauzi, and Roshun Paurobally. "Modelling and simulation of active noise control in a small room." Journal of Vibration and Control 24, no. 3 (2016): 607–18. http://dx.doi.org/10.1177/1077546316647572.

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This paper presents the modeling and simulation results of active noise control (ANC) in a small room using the wave-based approach defined by particle velocities and sound pressure within the defined boundary conditions. The ANC system excitation is a single-frequency noise with an adaptive feedforward configuration. The Finite Difference Time Domain (FDTD) algorithm is used to model the room acoustics due to a boxed loudspeaker of single frequency. A control system based on the filtered-x least mean-squared (FxLMS) algorithm is utilized to synthesize a cancelling noise using a secondary loud

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Cox, Trevor J., Bruno M. Fazenda, and Susan E. Greaney. "Using scale modelling to assess the prehistoric acoustics of Stonehenge." Journal of Archaeological Science 122 (October 2020): 105218. http://dx.doi.org/10.1016/j.jas.2020.105218.

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