Relevant bibliographies by topics / Room Acoustic Simulation

Academic literature on the topic 'Room Acoustic Simulation'

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Published: 14 March 2023
Last updated: 25 May 2024

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Journal articles on the topic "Room Acoustic Simulation"

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Zhang, Zhichao, and Guangzheng Yu. "Influence of sound source directivity on finite element simulation of small-room acoustics." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A42. http://dx.doi.org/10.1121/10.0015479.

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Numerical simulation is a flexible and effective method for room acoustic design. Full-range simulation of room acoustics requires a combination of different numerical methods, in which wave acoustic methods (WAM) and geometric acoustic methods (GAM) are used for the low and high frequency region, respectively. In the general low-frequency WAM simulation, a sound source is often assumed to be a point source or loudspeakers are usually approximated by circular planar pistons. However, compared to a large room, the critical frequency between WAM and GAM should be higher in acoustic simulation of small rooms because of relative size between the wavelength and the room, and thus, the above simplifications of actual sound sources, typically loudspeakers, may lead to errors in terms of directivity in the frequency range that the WAM is applied for. Further errors in the desired room impulse responses or other room acoustic parameters caused by directivity errors needs quantitative analysis, and then evaluation can be made on whether it is necessary to consider a more accurate sound source directivity in the WAM simulation of small room acoustics.
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Komínková, Kateřina, Michal Papranec, and Libor Šteffek. "Simulation of Different Acoustic Lecture Room Designs." Advanced Materials Research 899 (February 2014): 505–8. http://dx.doi.org/10.4028/www.scientific.net/amr.899.505.

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Room acoustics of the internal environment is among others an important part of good design. The paper deals with the simulation of lecture room acoustic structural modifications. In specific lecture room was measured reverberation time of the current state. Based on the results of the measurements several design variations of acoustic structures have been made to suit the room with a standard requirements for recitation. Subsequently, these measures were modeled and examined in the simulation program. The paper points to the importance of simulations in design of interior acoustic adjustments.
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okcu, selen. "Realism analysis of synthesized healthcare sound environments." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A182. http://dx.doi.org/10.1121/10.0015965.

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The acoustic qualities of healthcare sound environments can have significant influences on care providers’ ability to conduct critical sound tasks. Healthcare professionals constantly listen to the aural cues (e.g., alarms) and make critical decisions based on them. This study aims to assess the reliability of an open-source acoustical simulation tool in rendering healthcare providers’ auditory experience to enable the development of effective healthcare sound environments. The Pachyderm is developed as an open-source acoustical modeling and simulation plug-in for the Rhinoceros 3D-modeling platform commonly used by designers. The plug-in can compute various room acoustics metrics and generate auralizations by convolving anechoic recordings with the predicted acoustic signature of the architectural settings. While reliable predicted acoustic metrics are critical for iterative room-acoustics design studies, high fidelity auralizations can enable acoustic evaluations mainly based on critical listening and encourage collaboration between acoustical consultants, care providers and designers. The study introduces the findings of acoustic assessments including simulations and field measurements conducted in a new 14-bed adult medical-surgical inpatient unit at Milton S. Hershey Medical Center. The effectiveness is evaluated based on the deviation between the predicted and measured objective measures, and perceived differences between the auralizations and audio recordings assessed via listening tests.
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Masih, Dawa A. A., Nawzad K. Jalal, Manar N. A. Mohammed, and Sulaiman A. Mustafa. "The Assessment of Acoustical Characteristics for Recent Mosque Buildings in Erbil City of Iraq." ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY 9, no. 1 (March 1, 2021): 51–66. http://dx.doi.org/10.14500/aro.10784.

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The study of mosque acoustics, concerning acoustical features, sound quality for speech intelligibility, and additional practical acoustic criteria, is commonly overlooked. Acoustic quality is vital to the fundamental use of mosques, in terms of contributing toward prayers and worshippers’ appreciation. This paper undertakes a comparative analysis of the acoustic quality level and the acoustical characteristics for two modern mosque buildings constructed in Erbil city. This work investigates and examines the acoustical quality and performance of these two mosques and their prayer halls through room simulation using ODEON Room Acoustics Software, to assess the degree of speech intelligibility according to acoustic criteria relative to the spatial requirements and design guidelines. The sound pressure level and other room-acoustic indicators, such as reverberation time (T30), early decay time, and speech transmission index, are tested. The outcomes demonstrate the quality of acoustics in the investigated mosques during semi-occupied and fully-occupied circumstances. The results specify that the sound quality within the both mosques is displeasing as the loudspeakers were off.
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Zhu, Liying, Junjuan Zhao, Xianhui Li, Bin Zhang, Yueyue Wang, Wenjiang Wang, and Yunan Liu. "Design and simulation of acoustics for the home theatre." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 4 (August 1, 2021): 2052–57. http://dx.doi.org/10.3397/in-2021-2039.

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As a typical acoustics room, the sound quality of home theatre is an important standard to evaluate its design. Qualified acoustics design is the guarantee of good sound quality. The volume of home theatre is generally small, so the room size is similar to the low-frequency wavelength. Then the resonance will occur when the excitation of the sound source frequency acts on the natural resonance frequency of the room. At the same time, the secondary reflection of the room also interferes the direct sound emitted by the speaker, thus destroying the sound image. In order to solve the above problems, this paper took a home theatre as an example, analyzed the normal modes of the room by the theory of wave acoustics, and then made an acoustics design and simulation. The simulation results showed that the reverberation time was up to the relevant standards and the room acoustic quality environment was improved obviously after the acoustic design.
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Nowoświat, Artur, and Marcelina Olechowska. "Experimental Validation of the Model of Reverberation Time Prediction in a Room." Buildings 12, no. 3 (March 13, 2022): 347. http://dx.doi.org/10.3390/buildings12030347.

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It is well known that the uncertainty of input data has a great influence on the accuracy of room acoustics simulations. The aforementioned accuracy is significantly influenced by the selection of the acoustic properties of room-delimiting materials. Moreover, simulation errors are attributed to the fact that rooms can be very irregular and sound diffusion can be uneven, and thus sound absorption can be unevenly distributed over the surfaces. Therefore, a very important element is the validation of the simulation model of interior acoustics, even when we use ready-made software dedicated to interior acoustics for the simulation. In the article, the reverberation room model simulated in the ODEON program was subjected to validation. The program is based on a hybrid method combining the ray and virtual source methods. For the validation, appropriate measurements of the reverberation time in that room were carried out. The validation was undertaken using the criterion of correct validation, consisting of comparing the value of the comparison error and the value of the validation uncertainty.
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Okazawa, Kazuha, Takeshi Okuzono, and Takumi Yoshida. "An auditory virtual reality of meeting room acoustics using wave-based acoustic simulations: A content for intuitive understanding of room-acoustics control effect by sound absorbers." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 2 (November 30, 2023): 6328–35. http://dx.doi.org/10.3397/in_2023_0934.

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Recently, wave-based room acoustic simulation technologies are becoming a realistic option as a small-room acoustics design tool and a virtual indoor sound environment creation tool for research and education. The present paper shows an auditory VR meeting room content, which makes us easily understand how sound absorbers play an essential role in creating a better acoustic environment. Unity creates the 3D virtual reality model, and a binaural room-acoustic auralization is realized by a hybrid technique combined with Ambisonics and the head-related transfer function using RIRs computed by a high-speed parallel wave-based room acoustics solver. The VR meeting room is constructed under various acoustic treatments with sound absorber modeling by wave-based material models.
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Yoshida, Takumi, Takeshi Okuzono, Yui Sugimoto, and Kimihiro Sakagami. "An explicit time-domain FEM for acoustic simulation in rooms with frequency-dependent impedance boundary: Comparison of performance in 2D simulation with frequency-domain FEM." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 5 (August 1, 2021): 1120–29. http://dx.doi.org/10.3397/in-2021-1757.

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Accurate boundary modelings that address the frequency-dependent sound absorption characteristics of various sound absorbers are crucial for wave-based room acoustic simulation. In time-domain simulations, however, a computationally demanding convolution appears in frequency-dependent impedance boundary conditions. The present paper proposes a room acoustic solver with a fourth-order accurate explicit TD-FEM, incorporating a frequency-dependent absorbing boundary condition efficiently using a recursive convolution method, namely the auxiliary differential equation (ADE) method. Its performance against the fourth-order accurate frequency-domain FEM is examined via 2D real-scale room acoustic problems, solving a sound propagation in an office room up to 4.5 kHz. Firstly, we describe briefly the formulation of the proposed room acoustics solver based on the explicit TD-FEM. Then, the discretization error property of the proposed method is evaluated via an impedance tube problem, including a frequency-dependent impedance boundary of porous sound absorber. Finally, the accuracy and efficiency of the proposed method are demonstrated with the comparison of frequency-domain FEM solver, which uses a sparse direct solver for the solution of the linear system at each frequency. Results showed the proposed method can perform an acoustic simulation with significantly low computational costs compared to the frequency-domain solver while keeping an acceptable level of accuracy.
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Prasetya, Maria Christina. "Design of Simple Acoustic Materials for High School Hall Using Software CATT." Journal of Artificial Intelligence in Architecture 1, no. 1 (January 27, 2022): 10–19. http://dx.doi.org/10.24002/jarina.v1i1.4874.

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Good acoustic quality is essential to consider in designing a multipurpose room. Unfortunately, school halls usually have poor room acoustics. Lack of funds and lack of knowledge about acoustics cause the acoustic quality of the room to be very poor. The purpose of this research is to design a simple acoustic material application concept for a high school hall based on the Ministry of Education and Culture manual to meet the requirements for speech, music, and sports functions. Simple acoustic materials exist in everyday life, such as corrugated cardboard, cork, multiplex boards, newspapers, egg racks, and cloth. The research applied a simulation method using CATT v8 software. The parameters used to measure room acoustic quality were RT60, C-80, D-50, STI, EDT, and LF The simulation compared the hall's acoustic performance without and with the simple sound absorbers. The absorbers were applied to 39% of the walls and 55% ceilings. The absorbers reduced T-30 (500Hz) from 3.8 seconds to 1.5 seconds with an omni sound source and 1.3 seconds with speakers. The averaged Speech Transmission Index (STI) was improved from 38% to 60% with the omni sound source and from 43% to 65% with speakers.
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Vorlaender, Michael, and Lukas Aspoeck. "How real is Virtual Acoustics?" Journal of the Acoustical Society of America 152, no. 4 (October 2022): A150. http://dx.doi.org/10.1121/10.0015853.

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Recent comparisons of room-acoustic simulations and auralizations demonstrated that a high degree of realism can be achieved under certain conditions. How close the simulation can get to reality depends on the definition of the objective in general terms (authenticity or plausibility). The question is also what is the application scenario of the simulation. The goal can be to create an exact replica of a real space, a blind simulation of a future or lost space, or a demonstration of consequences of decisions during a design process. This work discusses the sources of uncertainties in Virtual Room Acoustics, the effort to be taken for achieving high realism, and suggestions for use of Virtual Acoustics in practice.
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Dissertations / Theses on the topic "Room Acoustic Simulation"

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Durany, Vendrell Jaume. "Geometrical room acoustics: ray based simulation for room acoustics." Doctoral thesis, Universitat Pompeu Fabra, 2016. http://hdl.handle.net/10803/395190.

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L’acústica de sales és la ciència encarregada d’estudiar la propagació del so en entorns tancats. La informació acústica de qualsevol entorn, coneguda com la resposta impulsional, s’expressa en termes del camp acústic com una funció de l’espai i el temps. La formulació analítica de la distribució de les variables del so és, en general, extremadament complexa d’obtenir i només existeixen solucions d’escenaris molt simples i irreals. Per tant, l’ús d’ordinadors per solucionar aquest tipus de problemes ha emergit com una alternativa adequada per calular funcions de resposta. En aquesta Tesi ens hem centrat en l’ús de mètodes basats en rajos per calcular funcions de resposta. Més concretament, presentem el disseny i la implementació d’un motor de traçat de rajos que calcula funcions de resposta en cualsevol entorn virtual, obtenint no només la funció de resposta per la presió sinó també pel vector de velocitats del camp acústic. Amb aquesta informació extra tenim totes les dades necessàries per modelar la propagació del so i podem de forma natural espacialitzar un so per qualsevol configuració d’altaveus. Aquesta recerca contribueix als aspectes principals del càlcul de funcions de resposta utilitzant mètodes basats en rajos. El motor de traçat de rajos que presentem inclou un mètode desenvolupat per aplicar la solució analítica de la Funció de Distribució Acústica de Reflectància Bidireccional (A-BRDF) al Model de Dispersió Basat en Vectors (VBS), fet que redueix molt notablement el cost computacional.
Room acoustics is the science devoted to study sound propagation in enclosures where the sound conduction medium is bounded on all sides by walls, ceiling and floor. The acoustic information of any room, the so-called impulse response, is expressed in terms of the acoustic field as a function of space and time. The analytical formulation of the sound variables distribution is, in general, extremely hard to obtain and there only exist solutions of very simple and unrealistic scenarios. Therefore the use of computers for solving this type of problems has emerged as a proper alternative to calculate impulse responses. In this Thesis we focus on the use of the ray-based methods to compute impulse responses. More precisely, we present the design and implementation of a sound ray tracing engine that computes the impulse response in any given environment not only for the pressure but also for the velocity vector of the acoustic field. With this extra information we have all the necessary data to model the propagation of sound and we can then naturally spatialize the sound to any speakers layout. This research contributes to the main aspects in the computation of impulse responses using a ray-based approach. The presented ray tracing engine includes a method developed to apply the analytical solution for the Acoustic Bidirectional Reflectance Distribution Function (A-BRDF) in the Vector Based Scattering Model (VBS), which reduces dramatically the computational cost.
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Escolano, Carrasco José. "Contributions to discrete-time methods for room acoustic simulation." Doctoral thesis, Universitat Politècnica de València, 2010. http://hdl.handle.net/10251/8309.

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The sound field distribution in a room is the consequence of the acoustic properties of radiating sources and the position, geometry and absorbing characteristics of the surrounding boundaries in an enclosure (boundary conditions). Despite there existing a consolidated acoustic wave theory, it is very difficult, nearly impossible, to find an analytical expression of the sound variables distribution in a real room, as a function of time and position. This scenario represents as an inhomogeneous boundary value problem, where the complexity of source properties and boundary conditions make that problem extremely hard to solve. Room acoustic simulation, as treated in this thesis, comprises the algebraical approach to solve the wave equation, and the way to define the boundary conditions and source modeling of the scenario under analysis. Numerical methods provide accurate algorithms for this purpose and among the different possibilities, the use of discrete-time methods arises as a suitable solution for solving those partial differential equations, particularized by some specific constrains. Together with the constant growth of computer power, those methods are increasing their suitability for room acoustic simulation. However, there exists an important lack of accuracy in the definition of some of these conditions so far: current frequency-dependent boundary conditions do not comply with any physical model, and directive sources in discrete-time methods have been hardly treated. This thesis discusses about the current state-of-the-art of the boundary conditions and source modeling in discrete-time methods for room acoustic simulation, and it contributes some algorithms to enhance boundary condition formulation, in a locally reacting impedance sense, and source modelling in terms of directive sources under a defined radiation pattern. These algorithms have been particularized to some discrete-time methods such as the Finite Difference Time Domain and the Digital Waveguide Mesh.
Escolano Carrasco, J. (2008). Contributions to discrete-time methods for room acoustic simulation [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/8309
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Campos, Antonio Guilherme Rocha. "Three-dimensional digital waveguide mesh modelling for room acoustic simulation." Thesis, University of York, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.423754.

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Aspöck, Lukas [Verfasser], Michael [Akademischer Betreuer] Vorländer, and Stefan [Akademischer Betreuer] Weinzierl. "Validation of room acoustic simulation models / Lukas Aspöck ; Michael Vorländer, Stefan Weinzierl." Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://d-nb.info/1226303846/34.

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Aretz, Marc [Verfasser]. "Combined wave and ray based room acoustic simulations of small rooms : challenges and limitations on the way to realistic simulation results / Marc Aretz." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2012. http://d-nb.info/1029471134/34.

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SHTREPI, LOUENA. "Measurement traceability of sound scattering coefficient of diffusive surfaces used in room acoustics and virtual acoustical environments." Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2608163.

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The best concert halls take benefit not only from the basic room shape but also from the corrugations of the walls. These diffusive surfaces are responsible for energy mixing, energy extraction from geometrical paths, for filling gaps and increasing reflections density in the impulse response. Hence, performance spaces are characterized by a complex sound field, due to the presence of absorptive and diffusive surfaces. The acoustic properties of these surfaces are characterized based on laboratory standardized measurements. Despite this, no sufficiently satisfactory databases exist. Thus, acousticians and practitioners alike rely on guidelines and experience to make their design choices. Based on this state of the art of diffusive surface design, the present work aims at giving more insight on their deployment by looking at the argument from a multidimensional point of view. First, it considers the estimation of the accuracy of the physical phenomenon measurements (only the random-incidence scattering coefficient has been considered), and further studies the effects of this accuracy on the objective room acoustic parameters, on the accuracy of simulation results and on perception. Knowing this interactions would give a measure of how much effort should be put into the acoustic characterization of diffusive surfaces and more freedom/ restrictions regarding the design of such surfaces could be determined. In Chapter 2, the experimental results aimed at providing a useful insight into the accuracy of the measurement procedure prescribed in the ISO 17497-1:2004 standard. The unsolved aspects of the measurements set-up have been systematically investigated and their contribution to the random-incidence scattering coefficient values has been estimated. It was found that some of these aspects contribute significantly to the measurement accuracy. In Chapter 3, in-situ evaluations of the acoustic effects that diffusive surfaces have on the objective room acoustic parameters have been investigated. To deepen such knowledge, acoustic measurements have been carried out in a variable-acoustic concert hall, the Espace de Projection, at the Institut de Recherche et Coordination Acoustique/Musique in Paris. The sensitivity of the sound field has been objectively investigated by observing the variation of the objective acoustic parameters, that is EDT, T30, C80, D50 and IACC, in either reflective and diffusive condition. It was found that some parameters are more affected by the degree of surface diffusivity, thus, its accuracy. In Chapter 4 has been investigated objectively the sensitivity of a virtual room sound field to the scattering coefficients accuracy. Two different prediction models have been used to simulate the sound field within a fan-shaped hall. It was found that some simulated parameters are affected by the random-incidence scattering coefficient accuracy, i.e. uncertainties of input data, which are higher than a limit value, lead to less reliable simulation results. In Chapter 5, an auditory experiment has been conducted to highlight some perceptual aspects regarding the use of diffusive surfaces in concert halls. These results provide more insight and help to understand whether listeners perceive the presence of diffusive surfaces, and how this perception is scattered throughout the audience area. Furthermore, the study is aimed at determining the objective measurements of a sound field which best correlate to the subject’s perception. This would give the measure of how much effort should be put into the determination of the diffusive properties of surfaces, and which could be the variables to relate in an analytic equation, which could readily express the effects of diffusion in room acoustic.
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Brum, Cristhian Moreira. "SIMULAÇÃO ACÚSTICA DE SALAS DE AULA EM ESCOLAS DE EDUCAÇÃO BÁSICA: UMA PROPOSTA TIPOLÓGICA PARA PRÁTICA MUSICAL." Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/7813.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
The study of room acoustics is linked to the importance of sound inside a room, so the architectural characteristics of the internal space determine the acoustic behavior. To get better acoustics of a room there are computational methods that simulate the acoustic behavior of a room before his execution, providing the prediction of the simulated environment behavior from the acoustic point of view. The acoustic parameters of the resulting acoustic simulations as Reverberation Time, Initial Decay Time, Clarity, Sharpness and Speech Transmission Index, are responsible for identifying the acoustic conditions of the geometric model of a classroom. This geometric model used as sample classrooms of different types of municipal schools in Santa Maria - RS, with the aim of developing a classroom typology for the music teaching from virtual acoustic models using computing simulation. Geometric models of classrooms for teaching music were developed using as input data, dimensions, shapes and elements usually used in these environments and developed representative virtual acoustic models these virtual classrooms, in which were measured acoustic parameters related to the reverberation time from the impulse response of the acoustic models of virtual rooms. We analyzed the experimental results and simulated with and without furniture for the acoustic parameters, and these comparisons were related to the values of JND (Just Noticeable Difference) near the standard tolerance according to ISO 3382/2009 with normalized values of 500 Hz to 1000 Hz. A geometric study was developed based on Bolt (1946) which defined the appropriate geometric measures of the room. Thus, a functional typology was originated which meets the architectural acoustic requirements and the initial proposal of presenting a music classroom typology providing an environment with acoustic quality, according to Law number 11.769/2008 that inserts education music in schools on a mandatory basis.
O estudo da acústica de salas está vinculado à importância do som dentro de um recinto, logo, as características arquitetônicas do espaço interno determinam seu comportamento acústico. Para buscar melhores condições acústicas de um recinto disponibilizam-se métodos computacionais que simulem o comportamento acústico de uma sala, antes de sua execução, proporcionando a previsão de comportamento do ambiente simulado do ponto de vista acústico. Os parâmetros acústicos resultantes das simulações acústicas, como: Tempo de Reverberação, Tempo de Decaimento Inicial, Clareza, Definição e o Índice de Transmissão da Fala são responsáveis pela identificação das condições acústicas do modelo geométrico de uma sala de aula. Este modelo geométrico utilizou como amostra as salas de aula das diferentes tipologias de escolas da rede estadual de educação de Santa Maria - RS, com o objetivo de desenvolver uma tipologia de sala de aula, para o ensino da música, a partir de modelos acústicos virtuais utilizando-se simulação computacional. Foram desenvolvidos modelos geométricos de salas de aula para o ensino da música utilizando-se como dados de entrada, dimensões, formatos e elementos, usualmente utilizados nestes ambientes, e desenvolvidos modelos acústicos virtuais representativos destas salas, aos quais foi feita uma avaliação dos parâmetros acústicos relacionados ao tempo de reverberação, partindo-se da resposta impulso dos modelos acústicos virtuais das salas. Foram analisados resultados experimentais e simulados na situação sem mobília e com mobília, para os parâmetros acústicos, e essas comparações foram relacionadas com os valores de JND (em inglês Just Noticeable Difference) padronizadas as margens de tolerância, de acordo com a ISO 3382/2009, com valores normalizados de 500 Hz a 1000 Hz. Também foi desenvolvido um estudo geométrico, a partir de Bolt (1946), que definiu as medidas geométricas adequadas da sala. Com isto, originou-se uma tipologia funcional, observando as exigências acústicas arquitetônicas, cumprindo a proposta inicial de apresentar uma tipologia de sala de aula, para a música, a fim de proporcionar um ambiente com qualidade acústica, atendendo a Lei nº 11.769/2008, que insere o ensino da música nas escolas, de forma obrigatória.
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Zhang, Wei. "Simulation and experimental study of room acoustics." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27311.

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Sound propagation is a complex subject, especially in an enclosure. The study of room acoustics involves not only a research into how sound is propagated in a room, but also a search into how to measure sound under different condition and how to control sound in the case of various wall materials. For an acoustical environment, there are three separated parts: sound sources, room acoustics, and the listens. These three items form a source-medium-receiver chain, which is typical for most of communication models. In this thesis, the image method is applied to predict the acoustical quality of a real room, and the experiment for room acoustic measurement is set up. The simulation model using image method proved the design of the measurement system is efficient for room acoustics.
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Priede, Gareth. "Room acoustics : an investigation into the computer simulation of room acoustics, with special reference to Jameson Hall." Thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/5120.

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Bibliography: leaves 138-141.
This thesis consists of essentially two parts. The first deals with the theory and measurement of room acoustics while the second examines the room acoustic prediction methods.
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Spa, Carvajal Carlos. "Time-domain numerical methods in room acoustics simulations." Doctoral thesis, Universitat Pompeu Fabra, 2009. http://hdl.handle.net/10803/7565.

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L'acústica de sales s'encarrega de l'estudi del comportament de les ones sonores en espais tancats.La informació acústica de qualsevol entorn, coneguda com la resposta impulsional, pot ser expressada en termes del camp acústic com una funció de l'espai i el temps. En general, és impossible obtenir solucions analítiques de funcions resposta en habitacions reals. Per tant, en aquests últims anys, l'ús d'ordinadors per resoldre aquest tipus de problemes ha emergit com una solució adecuada per calcular respostes impulsionals.
En aquesta Tesi hem centrat el nostre anàlisis en els mètodes basats en el comportament ondulatori dins del domini temporal. Més concretament, estudiem en detall les formulacions més importants del mètode de Diferències Finites, el qual s'utilitza en moltes aplicacions d'acústica de sales, i el recentment proposat mètode PseudoEspectral de Fourier. Ambdós mètodes es basen en la formulació discreta de les equacions analítiques que descriuen els fenòmens acústics en espais tancats.
Aquesta obra contribueix en els aspectes més importants en el càlcul numèric de respostes impulsionals: la propagació del so, la generació de fonts i les condicions de contorn de reactància local.
Room acoustics is the science concerned to study the behavior of sound waves in enclosed rooms. The acoustic information of any room, the so called impulse response, is expressed in terms of the acoustic field as a function of space and time. In general terms, it is nearly impossible to find analytical impulse responses of real rooms. Therefore, in the recent years, the use of computers for solving this type of problems has emerged as a proper alternative to calculate the impulse responses.
In this Thesis we focus on the analysis of the wavebased methods in the timedomain. More concretely, we study in detail the main formulations of FiniteDifference methods, which have been used in many room acoustics applications, and the recently proposed Fourier PseudoSpectral methods. Both methods are based on the discrete formulations of the analytical equations that describe the sound phenomena in enclosed rooms.
This work contributes to the main aspects in the computation of impulse responses: the wave propagation, the source generation and the locallyreacting boundary conditions.
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Books on the topic "Room Acoustic Simulation"

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Pospiech, Martina. Numerical Simulations in Room Acoustics Using Direct Coupling Techniques and Finite Elements. Logos Verlag Berlin, 2012.

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Book chapters on the topic "Room Acoustic Simulation"

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Tsuboi, M. "Numerical Simulation of Transient Response for Room Acoustic Design - Proposition of the Phase Element Integration Method (PEIM)." In Applications of Supercomputers in Engineering II, 403–17. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3660-0_29.

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Tomiku, Reiji, Shinichi Sakamoto, Noriko Okamoto, Yosuke Yasuda, Yoshinari Horinouchi, and Kazuma Hoshi. "Room Acoustics Simlation." In Computational Simulation in Architectural and Environmental Acoustics, 145–78. Tokyo: Springer Japan, 2014. http://dx.doi.org/10.1007/978-4-431-54454-8_6.

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Vorländer, Michael. "Room Acoustics – Fundamentals and Computer Simulation." In Springer Handbook of Systematic Musicology, 197–215. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-55004-5_11.

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Berkhoff, A. P., C. H. Slump, O. E. Herrmann, and B. J. Hoenders. "Simulation of room acoustics using a digital signal processor." In Signal Processing, 1713–16. Elsevier, 1992. http://dx.doi.org/10.1016/b978-0-444-89587-5.50130-4.

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Simovic, Vladimir, Sinisa Fajt, and Miljenko Krhe. "Stochastic Based Simulations and Measurements of Some Objective Parameters of Acoustic Quality: Subjective Evaluation of Room Acoustic Quality with Acoustics Optimization in Multimedia Classroom (Analysis with Application)." In Stochastic Modeling and Control. InTech, 2012. http://dx.doi.org/10.5772/45950.

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Conference papers on the topic "Room Acoustic Simulation"

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KHRYSTOSLAVENKO, Olga, and Raimondas GRUBLIAUSKAS. "SIMULATION OF ROOM ACOUSTICS USING COMSOL MULTIPHYSICS." In Conference for Junior Researchers „Science – Future of Lithuania“. VGTU Technika, 2017. http://dx.doi.org/10.3846/aainz.2017.06.

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The modeling programs provide a wide range of possibilities for simulating acoustic systems. This paper describes programs used in acoustics for various purposes, such as Sound PLAN, AFMG SoundFlow, WinFLAG, Comsol multiphysics, ANSYS, Roomsim. For the purposes of the current research, the acoustic simulation of the room was carried out. Physical parameters as impedance, sound hard boundary and normal velocity were considered. The sound pressure level in rooms was investigated. Possibilities of using Comsol Multiphysics in the research of acoustics were investigated. Results of the current research show high-frequency eigenmodes located in the corners of the room and in the center of the room. Sound pressure level increased from low to medium frequency and then decreased with frequency drifts. At the frequency of 5000 Hz, minimum sound pressure is observed, which is associated with the decrease in the wavelength co-occurring with the decrease in frequency.
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Costantini, G., D. Casali, and A. Uncini. "Adaptive room acoustic response simulation: a virtual 3D application." In 2003 IEEE XIII Workshop on Neural Networks for Signal Processing (IEEE Cat. No.03TH8718). IEEE, 2003. http://dx.doi.org/10.1109/nnsp.2003.1318066.

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Primavera, Andrea, Stefania Cecchi, Francesco Piazza, Junfeng Li, and Yonghong Yan. "An efficient time varying hybrid reverberator for room acoustic simulation." In 2014 IEEE China Summit & International Conference on Signal and Information Processing (ChinaSIP). IEEE, 2014. http://dx.doi.org/10.1109/chinasip.2014.6889235.

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Sluyts, Yannick, Leopold Kritly, Arnon Vandenberghe, Christ Glorieux, and Monika Rychtarikova. "Case study: the influence of model size on local room acoustic parameters in Odeon." In 2021 Building Simulation Conference. KU Leuven, 2021. http://dx.doi.org/10.26868/25222708.2021.30938.

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Karlberg, Jonas, Alessia Milo, Finnur Pind, and Runar Unnthorsson. "Preserving Auditory Cues for Human Echolocation Training: A Geometrical Acoustics Study Using a Benchmark Dataset (BRAS)." In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-97044.

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Abstract Human echolocation is a method mainly used within the blind community to navigate using sound emission and analysing the returning echoes from the surrounding environment. Echolocation is predominantly trained by orientation and mobility instructors at visual rehabilitation centres. However, systematic guidelines or protocols focusing on the requirements of room acoustic simulations to accurately represent the auditory cues necessary in a virtual training environment for echolocation have not yet been developed. This paper sets out to investigate the use of geometrical acoustic (GA) calculations for a virtual echolocation training system comparing the measurements from the Benchmark for Room Acoustical Simulation (BRAS) dataset with other GA calculations outcomes. Three simple and one complex test scenes are chosen from the dataset. The calculation settings are optimised for each test scene considering the complexity of the scene, room volume and acoustic phenomena. The monaural room impulse responses from the simulations are analysed with respect to the timing of the reflections and the level relations between the reflections and the resulting frequency response for each scene. These are subsequently compared with each measured counterpart. The paper discusses the results, their limitations, and provides recommendations on the use of GA calculation tools for echolocation training scopes.
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Yan, Jia, and W. Bastiaan Kleijn. "Fast simulation method for room impulse responses based on the mirror image source assumption." In 2016 IEEE International Workshop on Acoustic Signal Enhancement (IWAENC). IEEE, 2016. http://dx.doi.org/10.1109/iwaenc.2016.7602902.

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Georgiou, Ioannis T., Christos I. Papadopoulos, and Dimitris P. Servis. "Applying Proper Orthogonal Decomposition Tools for Modal Identification of Coupled Structural-Acoustic Dynamic Fields." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59689.

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To characterize the modal structure of the interaction dynamics of plate-like structures functioning as sound reducing systems, we apply the method of Proper Orthogonal Decomposition (POD) to analyze the dynamics of a room-plate-room coupled system. Given the finite element simulation as information on the dynamic response of this coupled system, it is shown that the POD technique identifies unique, optimum spatial patterns (modes) for all dynamic fields such as the sound pressure in the rooms and especially the vibration response of the plate. The Proper Orthogonal Decomposition (POD) technique proves to be a very effective identification tool for structural-acoustical systems.
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Abdul Qayyum, Alif Bin Abdul, Adrita Anika, Md Messal Monem Miah, Md Mushfiqur Rahman, K. M. Naimul Hasan, Md Tariqul Islam, Sheikh Asif Imran Shouborno, Md Farhan Shadiq, and Mohammad Ariful Haque. "Direction of Arrival Estimation through Noise Supression: A Novel Approach using GSC Beamforming and Room Acoustic Simulation." In 2019 IEEE International Conference on Signal Processing, Information, Communication & Systems (SPICSCON). IEEE, 2019. http://dx.doi.org/10.1109/spicscon48833.2019.9065151.

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Keßler, Manuel. "Expanding Helicopter Noise Simulation Scope, based on High-Fidelity CFD." In Vertical Flight Society 75th Annual Forum & Technology Display. The Vertical Flight Society, 2019. http://dx.doi.org/10.4050/f-0075-2019-14452.

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Based on a previous high fidelity CFD simulation of descent flight for acoustic evaluation, the two other certification points of takeoff and flyover have been investigated. Selected simulation results are compared to flight test data and among each other, investigating commonalities as well as deviations. Special consideration was given to the separate analysis of blade harmonics and broadband noise, expecting the latter to be less accessible to CFD. However, the accuracy of results varies for both shares, ranging from excellent to leaving room for considerable improvement. An old empirical model for broadband noise did not deliver the upgrade hoped for. For takeoff, an alternative data set with a slightly different, but equally plausible trim condition was analyzed, resulting in a rough sensitivity estimate. Summing up, acoustic evaluation of high fidelity CFD can give valuable qualitative information, and in some, albeit not all, cases match flight tests and parameter dependencies also quantitatively.
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Yang, Wenlong, Jamie Hamilton, Gang Yin, and Kara Gordon. "Sound Transmission Loss through Front of Dash and Instrumental Panel." In WCX SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2024. http://dx.doi.org/10.4271/2024-01-2349.

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<div class="section abstract"><div class="htmlview paragraph">The subsystem of front of dash (FOD) and instrument panel (IP) is a critical path to isolate the powertrain noise and road noise for vehicles. This subsystem mainly consists of sheet metal, dash mats, IP, and the components inside IP such as HVAC and wiring harness. To achieve certain level of cabin quietness, the sound transmission loss performance of this subsystem is usually used as a quantifier. In this paper, the sound transmission loss through the FOD and IP is investigated up to 10kHz, through both acoustic testing and numerical simulation. In the acoustic testing, the subsystem is cut from a vehicle and installed on the wall of two-rooms STL testing suite, with source room being reverberant and receiver room being anechoic. In the testing, various scenarios are measured to understand the contributions from different components. The numerical simulation is based on statistical energy analysis (SEA) because deterministic methods have difficulty to predict the STL up to 10k Hz due to problem size. Good correlations are obtained for all the scenarios. From the investigation, the contribution from different components to the overall STL performance is evaluated and ranked. Taking advantage of the correlated numerical models, design changes which are not feasible or easy to be measured are studied. As an example, in the “virtual” design changes related to the IP components, the influence from IP skin and leakages are checked.</div></div>
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