Academic literature on the topic 'Acoustics - Modelling'

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Journal articles on the topic "Acoustics - Modelling"

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

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Acoustics is important for all underwater systems for object detection, classification, surveillance systems, and communication. However, underwater acoustics is often difficult to understand, and even the most carefully conducted measurements may often give unexpected results. The use of theory and acoustic modelling in support of measurements is very important since theory tends to be better behaved and more consistent than experiments, and useful to acquire better knowledge about the physics principle. This paper, having a tutorial flair, concerns the use of ray modelling and in particular eigenray analysis to obtain increased knowledge and understanding of underwater acoustic propagation.
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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 ones and a few remarks for the improvement of the room are made.
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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 propagation, and on spatial audio technology. Whether the virtual environment is considered sufficiently accurate or not, depends on many perceptual factors, and on the pre-conditioning and immersion of the user in the virtual environment. In this paper the processing steps for creation of Virtual Acoustic Environments and the achievable degree of realism are briefly reviewed. Applications are discussed in examples of room acoustics, archeological acoustics, aircraft noise, and audiology.
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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 processing units (GPGPUs) and Single Instruction/Multiple Data (SIMD) computing units is one way to achieve this optimization. In addition to improving the computational speed of established models, these optimized models can also contribute to implementing more sophisticated modelling approaches, such as broad-band modelling. In this study, we will discuss the optimized performance of established codes, particularly those based on parabolic equation methods (PE), and also discuss the results of advanced modelling techniques.
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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. Current research in linking the boundary element method to other methods in order to solve coupled vibro-acoustic and aero-acoustic problems and methods for solving inverse problems via the BEM are surveyed. Applications of the BEM in each area of acoustics are referenced. The computational complexity of the problem is considered and methods for improving its general efficiency are reviewed. The significant maintenance issues of the standard exterior acoustic solution are considered, in particular the weighting parameter in combined formulations such as Burton and Miller’s equation. The commonality of the integral operators across formulations and hence the potential for development of a software library approach is emphasised.
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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 the fluid. By changing the agitation frequency variable sound distribution at the interval of different frequencies is obtained. Constructing the calculation scheme for a three dimensional locomotive model, spatial structure of finite elements is used. The whole construction was described by 3D finite elements FLUID30 designed for a specified acoustic analysis. The presented acoustic calculation model of rolling‐stock cabin allows the evaluation of structural solutions and, in case of emergency, taking extra measures in the process of rolling‐stock design. The results of acoustic calculation were compared with experimental measurements.
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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 techniques are compared, and in general a satisfactory agreement has been found. The advantages and drawbacks related to each of the modelling techniques are discussed.
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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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Dissertations / Theses on the topic "Acoustics - Modelling"

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Ajaz, Mahnoor. "Finite Difference Time Domain Modelling of Ultrasonic Parametric Arrays in Two-Dimensional Spaces." The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1619109761801613.

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Hurrell, Andrew M. "Finite difference modelling of acoustic propagation and its applications in underwater acoustics." Thesis, University of Bath, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250842.

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Rowley, William. "Mathematical modelling of novel metamaterials for noise reduction applications." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/mathematical-modelling-of-novel-metamaterials-for-noise-reduction-applications(7ce8e9fb-4c2c-4637-ac89-c156949f9a27).html.

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In this thesis we investigate acoustic metamaterials and how they can influence incident sound waves. Specifically we are interested in the mathematical technique of transformation acoustics and how several simple examples of metamaterials, devised via transformation acoustics, can be realised physically. We present a simple methodology for optimising microstructure consisting of rods with elliptical cross sections arranged on a rectangular array in order to best fit the material properties required by a desired transformation. We present in detail three such examples: a one dimensional scaling, the beam shifter, and a right angle bend. We apply the one dimensional scaling to a quarter wavelength resonator, theoretically predicting that we are able to lower the active frequency of the resonator without increasing its physical length. This result is then confirmed experimentally. We provide further experimental evidence of the broad band nature of the microstructure and suggest how it could be applied as a one dimensional acoustic cloak. Finally we present numerical simulations of acoustic propagation through microstructure chosen to realise a beam shifter and right angle bend. These are devices associated with more complicated two dimensional transformations that may prove useful in the field of noise control and redirection.
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Jackson, Edward James. "Modelling and monitoring nonlinear acoustic phenomena in high-intensity focused ultrasound therapy." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:cea762cf-8a12-4265-b1b1-a15214c58ac3.

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High intensity focused ultrasound (HIFU) provides a wide range of noninvasive therapies ranging from drug delivery to the destruction of kidney stones. In particular, thermal ablation by HIFU presents an effective noninvasive method for the treatment of deep seated solid tumours. HIFU’s further uptake is limited by a need for improved treatment planning and monitoring. Two nonlinear acoustic phenomena that play key roles in HIFU treatment: finite amplitude effects that lead to the generation of harmonics and steepening of wavefronts, and acoustic cavitation. The former must be taken into careful consideration for treatment planning purposes, while the latter has the potential to provide fast, real-time, cost effective treatment monitoring. The first half of this thesis provides new measurements for the nonlinear acoustic properties of tissue, assesses the validity of two common modelling techniques for simulating HIFU fields. The second half develops a new method for combining passive acoustic mapping- an ultrasound monitoring technique- with MR thermometry, to assess estimates of cavitation enhanced heating derived from passive acoustic maps. In the first results chapter B/A was measured in ex-vivo bovine liver, over a heating/ cooling cycle replicating temperatures reached during HIFU ablation, adapting a finite amplitude insertion technique (FAIS), which also allowed for measurement of sound-speed and attenuation. The method measures the nonlinear progression of a plane-wave through liver and B/A was chosen so that numerical simulations matched measured waveforms. Results showed that attenuation initially decreased with heating then increased after denaturation, sound-speed initially increased with temperature and then decreased, and B/A showed an increase with temperature but no significant post-heating change. These data disagree with other reports that show a significant change and suggest that any nonlinear enhancement in the received ultrasound signal post-treatment is likely due to acoustic cavitation rather than changes in tissue nonlinearity. In the second results chapter two common methods of modelling HIFU fields were compared with hydrophone measurements of nonlinear HIFU fields at a range of frequencies and pressures. The two methods usedwere the KZK equation and the commercial package PZFlex. The KZK equation has become the standard method for modelling focused fields, while the validity of PZFlex for modelling these types of transducers is unclear. The results show that the KZK equation is able to match hydrophone measurements, but that PZFlex underestimates the magnitude of the harmonics. Higher order harmonics in PZFlex are not the correct shape, and do not peak around the focus. PZFlex performs worse at higher pressures and frequencies, and should be used with caution. In the final two chapters a system for estimating cavitation-enhanced heating from acoustic maps is developed and benchmarked against magnetic resonance thermometry methods. The first chapter shows that the ultrasound and MR monitoring systems are compatible, and registers the two imaging systems. The HIFUfocus is clearly visible in passive maps acquired in the absence of cavitation and these coincide with the centre of heating in MR temperature images. When cavitation occurs, it coincides spatially and temporally with the appearance of a clear spike in temperature, especially when the passive maps are processed using the Robust Capon Beamformer algorithm. The final chapter shows how passive maps can be converted into thermal heating inputs, and used to estimate cavitation-enhanced temperature increases. These estimates have the potential to closely match maximum temperature rise, and estimated thermal dose after the estimated temperature rise is spatially averaged. However, themethod is not always successful. This is partly due to uncertainties in MR thermometry estimates, partly due to uncertainties in the acoustic properties of tissue.
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Murphy, Damian Thomas. "Digital waveguide mesh topologies in room acoustics modelling." Thesis, University of York, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313846.

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Östberg, Martin. "Modelling Tools for Quieter Vehicles : Effective Vibro-Acoustical Modelling of Rotationally Symmetric Structures Consisting of Visco-Elastic and Poro-Elastic Media." Licentiate thesis, KTH, VinnExcellence Center for ECO2 Vehicle design, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-13251.

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Legoh, Finarya. "An investigation into auditorium design using 1:50 physical scale modelling and computer modelling." Thesis, University of Salford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238916.

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Lea, Andrew P. "Auditory modelling of vowel perception." Thesis, University of Nottingham, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315235.

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Lundberg, Eva. "Micro-Structure Modelling of Acoustics of Open Porous Material." Licentiate thesis, KTH, Farkost och flyg, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187322.

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Transportation is a large and growing part of the world’s energy consumption. This drives a need for reduced weight of rail vehicles, just as it does for road vehicles. In spite of weight reductions, the vehicle still has to provide the same level of acoustic comfort for the passengers. Porous materials, with more than 90% air, are often included in multi-layer vehicle panels, contributing to acoustic performance without adding much weight. Here the acoustic performance of open cell porous materials, with focus on flow resistivity, is evaluated based on simplified micro-structure models to investigate the effect of anisotropy on the performance In order to evaluate how the redistribution of material affects the flow resistivity, the porosity of the material is kept constant. Two micro-geometries are analysed and compared: the hexahedral model and the tetrakaidecahedron (Kelvin cell). For flow resistivity calculations the solid frame is assumed to be rigid. The models are elongated in one direction to study the influence of micro-structural anisotropy on the macro level flow resistivity. To keep porosity constant, two different approaches are investigated. The first approach is to let strut thickness be uniform and adjust the volume of the cell to a constant ratio compared to the isotropic case. The second approach is to let the strut volume, and cell volume, be constant. For an anisotropic hexahedral cell with uniform strut thickness, the flow resistivity increases substantially with increasing height to width ratio for the hexahedral model, while the flow resistivity for the tetrakaidecahedron model with uniform strut thickness decreases with increasing height to width ratio. For both geometries and constant strut volume, the average flow resistivity is close to the same constant value. For uniform strut thickness the relative volume of anisotropic to isotropic volume is very important.<br><p>The work has been carried out within the Centre for ECO<sup>2</sup> Vehicle Design.</p><p></p><p>QC 20160523</p>
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Forrest, James Alexander. "Modelling of ground vibration from underground railways." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323675.

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Books on the topic "Acoustics - Modelling"

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Etter, Paul C. Underwater Acoustic Modelling and Simulation. Taylor & Francis Group Plc, 2004.

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Ainslie, Michael A. Principles of sonar performance modelling. Springer, 2010.

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Noureddine, Atalla, ed. Propagation of sound in porous media: Modelling sound absorbing materials. 2nd ed. Wiley, 2009.

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Xiang, Ning. A mobile universal measuring system for the binaural-acoustic modelling-technique. Bundesanstalt für Arbeitsschutz, 1991.

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Hashimoto, Ken-ya. Surface Acoustic Wave Devices in Telecommunications: Modelling and Simulation. Springer Berlin Heidelberg, 2000.

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A, Mammoli A., and Brebbia C. A, eds. Moving boundaries VII: Computational modelling of free and moving boundary problems. WIT, 2004.

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Wong, Lawdy Siu Shan. Auditorium acoustic modelling based on chaotic realisation. Oxford Brookes University, 1999.

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Simms, Michael. Transmission -Line MAtrix Modelling of Acoustic Devices. University College Dublin, 1997.

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Round, Carl Graham. Mathematical modelling of acoustic cavitation and sonoluminescence. University of Birmingham, 1997.

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Willison, Peter A. Transmission line matrix modelling of underwater acoustic propagation. University of East Anglia, 1992.

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Book chapters on the topic "Acoustics - Modelling"

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Ainslie, Michael A. "Underwater acoustics." In Principles of Sonar Performance Modelling. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-87662-5_5.

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Willshare, G. T. "Acoustics in Marine Structures." In Industrial Vibration Modelling. Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-4480-0_5.

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Filippi, P. J. T. "Modelling of Fluid/Structure Interactions." In Fluid-Structure Interactions in Acoustics. Springer Vienna, 1999. http://dx.doi.org/10.1007/978-3-7091-2482-6_1.

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Blake, W. K., J. L. Gershfeld, and L. J. Maga. "Modelling of Trailing Edge Flow Tones in Elastic Structures." In Aero- and Hydro-Acoustics. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82758-7_15.

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Jensen, Finn B., and Henrik Schmidt. "Shear Properties of Ocean Sediments Determined from Numerical Modelling of Scholte Wave Data." In Ocean Seismo-Acoustics. Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2201-6_65.

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Schneider, Hans G. "Modelling Wind Dependent Acoustic Transmission Loss due to Bubbles in Shallow Water." In Progress in Underwater Acoustics. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1871-2_59.

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Welsh, M. C., and A. N. Stokes. "Transient Vortex Modelling of Flow Induced Acoustic Resonances Near Cavities or Obstructions in Ducts." In Aero- and Hydro-Acoustics. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82758-7_46.

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Wang, Zhong-Nan, James Tyacke, and Paul Tucker. "Hybrid LES/RANS Predictions of Flows and Acoustics from an Ultra-High-Bypass-Ratio Serrated Nozzle." In Progress in Hybrid RANS-LES Modelling. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70031-1_39.

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Moreira, Alysson B. Barbosa, and Fabrice Thouverez. "Dynamic Modelling and Vibration Control of a Turbomolecular Pump with Magnetic Bearings in the Presence of Blade Flexibility." In Rotating Machinery, Vibro-Acoustics & Laser Vibrometry, Volume 7. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74693-7_10.

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Pohjolainen, Seppo, and Antti Suutala. "Acoustic Modelling." In Mathematical Modelling. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27836-0_11.

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Conference papers on the topic "Acoustics - Modelling"

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Demiryurek, S. G., A. Krynkin, and J. Rongong. "MODELLING OF NONLINEAR DAMPERS UNDER LOW-AMPLITUDE VIBRATION." In ACOUSTICS 2020. Institute of Acoustics, 2020. http://dx.doi.org/10.25144/13356.

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Demiryurek, S. G., A. Krynkin, and J. Rongong. "MODELLING OF NONLINEAR DAMPERS UNDER LOW-AMPLITUDE VIBRATION." In ACOUSTICS 2020. Institute of Acoustics, 2020. http://dx.doi.org/10.25144/13356.

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Schrock, Johannes, Markus Schrogenhumer, Simon Weitzhofer, Josef Passenbrunner, and Manfred Nader. "An Integrated Mechatronic Modelling, Simulation, and Optimization Approach for the Customized Design of Active Vibration Damping Solutions." In 2018 Joint Conference - Acoustics. IEEE, 2018. http://dx.doi.org/10.1109/acoustics.2018.8502379.

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Osses Vecchi, Alejandro, Rodrigo García León, and Armin Kohlrausch. "Modelling the sensation of fluctuation strength." In 22nd International Congress on Acoustics: Acoustics for the 21st Century. Acoustical Society of America, 2016. http://dx.doi.org/10.1121/2.0000410.

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Etchemendy, Pablo E., Ramiro Vergara, and Manuel C. Eguía. "Modelling of the auditory ribbon synapse." In 22nd International Congress on Acoustics: Acoustics for the 21st Century. Acoustical Society of America, 2016. http://dx.doi.org/10.1121/2.0000446.

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Teodoro, M. Filomena. "Modelling a nonlinear MTFDE from acoustics." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS 2015 (ICNAAM 2015). Author(s), 2016. http://dx.doi.org/10.1063/1.4952098.

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Blanc, Silvia, Igor Prario, Mariano Cinquini, Patricio Bos, and Analia Tolivia. "Ultrasonic scattering responses from phytoplankton: Measurements and modelling." In 2017 IEEE/OES Acoustics in Underwater Geosciences Symposium (RIO Acoustics). IEEE, 2017. http://dx.doi.org/10.1109/rioacoustics.2017.8349702.

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Puranik, Ninad Vijay, and Gary P. Scavone. "Physical modelling synthesis of a harmonium." In Fourth Vienna Talk on Music Acoustics. ASA, 2022. http://dx.doi.org/10.1121/2.0001679.

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Bustos, C., V. Jurdic, C. Sharp, and D. Hiller. "OPTIMISATION OF RAILWAY NOISE BARRIER DESIGN USING FINITE ELEMENTS AND BOUNDARY ELEMENT MODELLING METHODS." In ACOUSTICS 2021. Institute of Acoustics, 2021. http://dx.doi.org/10.25144/13771.

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Cleveland, Robin O. "Modelling Nonlinear Ultrasound Propagation in Bone." In INNOVATIONS IN NONLINEAR ACOUSTICS: ISNA17 - 17th International Symposium on Nonlinear Acoustics including the International Sonic Boom Forum. AIP, 2006. http://dx.doi.org/10.1063/1.2210372.

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Reports on the topic "Acoustics - Modelling"

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Marinovic, Nenad M., and Leonid Roytman. Modelling, Detection, and Classification of Random Underwater Acoustic Transients. Defense Technical Information Center, 1992. http://dx.doi.org/10.21236/ada247797.

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Phillips, Michael, James Glass, and Victor Zue. Modelling Context Dependency in Acoustic-Phonetic and Lexical Representations. Defense Technical Information Center, 1991. http://dx.doi.org/10.21236/ada460564.

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Hirsekorn, M., P. P. Delsanto, N. K. Batra, and P. Matic. Modelling and Simulation of Acoustic Wave Propagation in Locally Resonant Sonic Materials. Defense Technical Information Center, 2002. http://dx.doi.org/10.21236/ada525809.

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Ratilal, Purnima. Characterizing Broadband Acoustic Propagation Scintillation and Modelling Scattering and Reverberation for Sensing in a Random Ocean Waveguide. Defense Technical Information Center, 2014. http://dx.doi.org/10.21236/ada615928.

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