Journal articles: '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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Meyer-Kahlen, Nils, Sebastian J. Schlecht, and Tapio Lokki. "Clearly audible room acoustical differences may not reveal where you are in a room." Journal of the Acoustical Society of America 152, no. 2 (August 2022): 877–87. http://dx.doi.org/10.1121/10.0013364.

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A common aim in virtual reality room acoustics simulation is accurate listener position dependent rendering. However, it is unclear whether a mismatch between the acoustics and visual representation of a room influences the experience or is even noticeable. Here, we ask if listeners without any special experience in echolocation are able to identify their position in a room based on the acoustics alone. In a first test, direct comparison between acoustic recordings from the different positions in the room revealed clearly audible differences, which subjects described with various acoustic attributes. The design of the subsequent experiment allows participants to move around and explore the sound within different zones in this room while switching between visual renderings of the zones in a head-mounted display. The results show that identification was only possible in some special cases. In about 74% of all trials, listeners were not able to determine where they were in the room. The results imply that audible position dependent room acoustic rendering in virtual reality may not be noticeable under certain conditions, which highlights the importance of evaluation paradigm choice when assessing virtual acoustics.

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Carneal, James P., Jan Johnson, Troge Johnson, and Marty Johnson. "Real‐time virtual room acoustic simulation." Journal of the Acoustical Society of America 114, no. 4 (October 2003): 2315. http://dx.doi.org/10.1121/1.4780951.

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D'Antonio, Peter, and Rinaldi P. Petrolli. "Non-cuboid Iterative room optimizer." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A144. http://dx.doi.org/10.1121/10.0010915.

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In past years, various iterative optimization programs emerged to separately determine the optimal room ratios, sources and listening positions of perfectly reflective cuboid rooms, using the image-source model. Despite its fast computation times, this approach does not account for scattering, phase change at the boundary and cannot be extended to non-cuboid rooms. This presentation describes the current status of a program called NIRO, that offers a solution to those issues, by using the Boundary Element Method (BEM) to compute the frequency response from 20–200 Hz, considering the effects of the boundary’s complex admittance and all acoustical elements inside the room. With BEM as its engine, a room optimization genetic algorithm was developed to optimize source and receiver positions simultaneously with the room geometry, aiming to present the best possible acoustic environment given imposed restraints. To control the room's temporal decay, low-frequency acoustic treatments were added to the BEM model. By using transfer matrix models, the acoustical behavior of different multilayered treatments can be modeled and inserted into the BEM simulation to evaluate the change in the room’s acoustic field and in the frequency response at the receiving positions. 3D waterfall plots illustrate the temporal decay following optimization. Examples will be presented.

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Olechowska, Marcelina, Artur Nowoświat, Jan Ślusarek, and Mateusz Latawiec. "The influence of the distribution of sound absorbing materials on the estimation of reverberation time in rooms." E3S Web of Conferences 49 (2018): 00078. http://dx.doi.org/10.1051/e3sconf/20184900078.

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Reverberation time in rooms depends on many factors, e.g. cubature, surface of envelopes, sound absorption coefficient of materials used for the construction of the envelopes, geometry of rooms or the distribution of sound absorbing materials. The arrangement of sound absorbing materials in rooms has an impact on the dispersion of acoustic field, yet theoretical calculation models do not take into account this impact. According to these models, regardless of the arrangement of sound absorbing materials, the reverberation time in a room will remain unchanged. The present paper investigates the above problem by means of computer simulations. For the needs of the simulation, three rooms with different dimensions were adopted, i.e. type 'p' - a cuboidal room with a square base, type 'd' - a cuboidal room (with one side of the 'p' room lengthened), type 'w' - a cuboidal room (with the height of the room lengthened 'p'). During the simulation, the way of acoustic field dispersion was being changed and its influence on the reverberation time in the rooms was being determined. The authors investigated two situations. The first one involved a non-dampened room, in which the sound absorbing material was being arranged differently. The second one involved a welldampened room, and the dispersion of sound field was analyzed depending on the location of the reflecting material.

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Sutanto, Andy, Jimmy Priatman, and Christina E. Mediastika. "KAJIAN PENERAPAN PRINSIP-PRINSIP AKUSTIK STUDI KASUS: RUANG AUDITORIUM MULTIFUNGSI GEDUNG P1 DAN P2 UNIVERSITAS KRISTEN PETRA." Dimensi Utama Teknik Sipil 1, no. 1 (October 31, 2014): 14–20. http://dx.doi.org/10.9744/duts.1.1.14-20.

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ABSTRACT: Besides visual aspect, room acoustic performance is also an important factor in determining multipurpose hall performance. Room acoustic performance can be achieved if some room acoustic objective parameters are taken into account, such as background noise level, reverberation time, and sound coverage. In order to meet these parameters, it can be done by using materials with appropriate coefficient absorbstion on floor, wall, ceiling and room geometry. Room acoustic objective parameters should be considered in design phase for optimum benefit. Room acoustic simulation on the design of multipurpose hall P1 and P2 Petra Christian University will be done by computer simulation.

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Sari, Laina Hilma, and Zulfian Zulfian. "An Assessment of Room Acoustics Performance of Baiturrahman Grand Mosque." Elkawnie 6, no. 1 (June 30, 2020): 24. http://dx.doi.org/10.22373/ekw.v6i1.5420.

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Abstract : Acoustical design as part of the audio comfort influences the architectural design strategy of a mosque significantly. As belonging to the speech room criteria, a mosque should meet some acoustic room requirements to deliver the solemnness to the worshipper during the prayer. Concerning this, the study aims to assess the indoor acoustics performance of Baiturrahman Grand Mosque, Banda Aceh. Baiturrahman grand mosque is an important place of worship for Acehnese and becoming a landmark of Banda Aceh City. The mosque which contains a lot of history of Aceh was built in heavy construction, i.e. concrete wall, marble coated floor, and concrete dome ceiling. Due to its significance, the room acoustics of the mosque as the primary design considerations in a speech room type is evaluated. The acoustics parameters estimated are Noise Criteria (NC), Sound Pressure Level (SPL), Reverberation Time (RT), and Rapid Speech Transmission Index (RASTI). The background noise was recorded for delivering the noise criteria and being the primary data carried out in the acoustic simulation. The study utilised CATT-Acoustic v7.2 software for simulating predicting SPL, RT, and RASTI.Abstrak : Desain akustik merupakan bagian dari parameter audio yang mempengaruhi desain arsitektur masjid secara signifikan. Masjid termasuk dalam kategori speech room yang harus memenuhi beberapa persyaratan akustik ruang untuk dapat menghadirkan kekhusyukan kepada jamaah selama sholat. Penelitian ini bertujuan untuk menilai kinerja akustik dalam ruangan Masjid Raya Baiturrahman, Banda Aceh. Masjid Raya Baiturrahman adalah tempat ibadah yang penting bagi orang Aceh dan menjadi simbol Kota Banda Aceh. Masjid yang memuat banyak sejarah Aceh ini terbuat dari dinding beton, lantai berlapis marmer, dan langit-langit kubah beton. Pada studi ini, parameter akustik ruang yang dievaluasi adalah Kriteria Kebisingan (NC), Tingkat Tekanan Suara (SPL), Waktu Gema (RT), dan Indeks Transmisi kecepatan Bicara (RASTI). Kebisingan latar belakang direkam untuk memberikan kriteria kebisingan dan menjadi data primer yang dilakukan dalam simulasi akustik. Studi ini menggunakan perangkat lunak CATT-Acoustic v7.2 untuk mensimulasikan prediksi SPL, RT, dan RASTI.

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Schmidt, Anne Marie Due, and Poul Henning Kirkegaard. "From Architectural Acoustics to Acoustical Architecture Using Computer Simulation." Building Acoustics 12, no. 2 (June 2005): 85–98. http://dx.doi.org/10.1260/1351010054037965.

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Architectural acoustics design has in the past been based on simple design rules. However, with a growing complexity in architectural acoustics and the emergence of room acoustic simulation programmes with considerable potential, it is now possible to subjectively analyse and evaluate acoustic properties prior to the actual construction of a building. With the right tools applied, acoustic design can become an integral part of the architectural design process. The aim of this paper is to investigate the field of application that an acoustic simulation programme can have during an architectural acoustic design process and to set up a strategy to develop future programmes. The emphasis is put on the first three out of four phases in the working process of the architect and a case study is carried out in which each phase is represented by typical results – as exemplified with reference to the design of Bagsvaerd Church by Jørn Utzon. The paper discusses the advantages and disadvantages of the programme in each phase compared to the works of architects not using acoustic simulation programmes. The conclusion of the paper points towards the need to apply the acoustic simulation programmes to the first phases in the architectural process and set out a reverse strategy for simulation programmes to do so – from developing acoustics from given spaces to developing spaces from given acoustics.

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Vorlaender, Michael. "Level of detail in room-acoustic simulation." Journal of the Acoustical Society of America 145, no. 3 (March 2019): 1853. http://dx.doi.org/10.1121/1.5101689.

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BAILESCU, Catalin, Vlad IORDACHE, and Tiberiu CATALINA. "Optimal cost-efficiency solution of acoustic treatment for a complex meeting room." E3S Web of Conferences 111 (2019): 02073. http://dx.doi.org/10.1051/e3sconf/201911102073.

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Achieving high acoustic quality in meeting rooms is important for intelligibility therefore several measures are needed especially in reflective high volume rooms. This article tackles the method and the solution to renovate a complex enclosure. The study is divided in multiple stages: development of the 3D room model exported in ODEON acoustic software, validation of the actual condition of the room with measurements, proposing and analysing different acoustic ceiling tiles and finally selecting the optimum solution based on the cost and efficacy in reducing the reverberation time (RT). The measured RT was four times higher (3.45 sec at f=1kHz) than the recommended value (0.9 sec at f=1kHz). The numerical simulation results were in accordance with the experimental measurements with errors of less than 0.2 sec. Using the difference between the RT obtained with the acoustic measures and the optimum RT we were able to calculate an efficiency that was later on compared with the cost of the solution. As a conclusion, due to a large diversity of acoustic ceiling types with different prices and sound absorption coefficients it is important, especially for complex room geometries, to run simulations and to perform a cost-efficiency analysis.

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Pranowo, Djoko Budiyanto Setyohadi, and Agung Tri Wijayanta. "The Lattice Boltzmann Method Using Parallel Computation: A Great Potential Solution for Various Complicated Acoustic Problems." Mathematical and Computational Applications 29, no. 1 (February 4, 2024): 12. http://dx.doi.org/10.3390/mca29010012.

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This paper proposes the D2Q5 Lattice Boltzmann method (LBM) method, in two dimensions with five discrete lattice velocities, for simulating linear sound wave propagation in closed rooms. A second-order linear acoustic equation obtained from the LBM method was used as the model equation. Boundary conditions at the domain boundary use the bounce-back scheme. The LBM numerical calculation algorithm in this paper is relatively simpler and easy to implement. Parallelization with the GPU CUDA was implemented to speed up the execution time. The calculation results show that the use of parallel GPU CUDA programming can accelerate the proposed simulation 27.47 times faster than serial CPU programming. The simulation results are validated with analytical solutions for acoustic pulse reflected by the flat and oblique walls, the comparisons show very good concordance, and the D2Q5 LBM has second-order accuracy. In addition, the simulation results in the form of wavefront propagation images in complicated shaped rooms are also compared with experimental photographs, and the comparison also shows excellent concordance. The numerical results of the D2Q5 LBM are promising and also demonstrate the great capability of the D2Q5 LBM for investigating room acoustics in various complexities.

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Woszczyk, Wieslaw. "Active Acoustics in Concert Halls - A New Approach." Archives of Acoustics 36, no. 2 (May 1, 2011): 379–93. http://dx.doi.org/10.2478/v10168-011-0028-6.

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Abstract Active acoustics offers potential benefits in music halls having acoustical short-comings and is a relatively inexpensive alternative to physical modifications of the enclosures. One critical benefit of active architecture is the controlled variability of acoustics. Although many improvements have been made over the last 60 years in the quality and usability of active acoustics, some problems still persist and the acceptance of this technology is advancing cautiously. McGill's Virtual Acoustic Technology (VAT) offers new solutions in the key areas of performance by focusing on the electroacoustic coupling between the existing room acoustics and the simulation acoustics. All control parameters of the active acoustics are implemented in the Space Builder engine by employing multichannel parallel mixing, routing, and processing. The virtual acoustic response is created using low-latency convolution and a three-way temporal segmentation of the measured impulse responses. This method facilitates a sooner release of the virtual room response and its radiation into the surrounding space. Field tests are currently underway at McGill University involving performing musicians and the audience in order to fully assess and quantify the benefits of this new approach in active acoustics.

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Autio, Hanna, Nikolaos-Georgios Vardaxis, and Delphine Bard Hagberg. "The Influence of Different Scattering Algorithms on Room Acoustic Simulations in Rectangular Rooms." Buildings 11, no. 9 (September 17, 2021): 414. http://dx.doi.org/10.3390/buildings11090414.

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Raytracing is a widespread tool for room acoustic simulations, and one of its main advantages is the inclusion of surface scattering. Although surface scattering has been acknowledged as a central aspect of accurate raytracing simulations for many years, there is ongoing research into its effects and how to implement it better. This study evaluates three different algorithms for surface scattering in raytracers, referred to as on–off scattering, perturbation scattering, and diffuse field scattering. Their theoretical foundation is discussed, and the physical accuracy of the resulting simulations is evaluated by comparing simulated room acoustic parameters to measurements. It is found that the choice of surface scattering algorithm has a significant impact on the simulation outcomes, both in terms of physical accuracy and in terms of usability. Additionally, there are differences in the parametrization of surface scattering depending on the algorithm chosen. Of the three tested algorithms, the most commonly used algorithm (on–off scattering) seems to have the best properties for simulations.

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T., Pazara. "Sound propagation modelling in a lecture hall." Scientific Bulletin of Naval Academy XXII, no. 2 (December 15, 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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Fratoni, Giulia, Brian Hamilton, and Dario D'Orazio. "Feasibility of a finite-difference time-domain model in large-scale acoustic simulations." Journal of the Acoustical Society of America 152, no. 1 (July 2022): 330–41. http://dx.doi.org/10.1121/10.0012218.

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Wave-based techniques for room acoustics simulations are commonly applied to low frequency analysis and small-sized simplified environments. The constraints are generally the inherent computational cost and the challenging implementation of proper complex boundary conditions. Nevertheless, the application field of wave-based simulation methods has been extended in the latest research decades. With the aim of testing this potential, this work investigates the feasibility of a finite-difference time-domain (FDTD) code simulating large non-trivial geometries in wide frequency ranges. A representative sample of large coupled-volume opera houses allowed demonstration of the capability of the selected FDTD model to tackle such composite geometries up to 4 kHz. For such a demanding task, efficient calculation schemes and frequency-dependent boundary admittances are implemented in the simulation framework. The results of in situ acoustic measurements were used as benchmarks during the calibration process of three-dimensional virtual models. In parallel, acoustic simulations performed on the same halls through standard ray-tracing techniques enabled a systematic comparison between the two numerical approaches highlighting significant differences in terms of input data. The ability of the FDTD code to detect the typical acoustic scenarios occurring in coupled-volume halls is confirmed through multi-slope decay analysis and impulse responses' spectral content.

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Oyekola, Peter, William Rogers, James Fedorka, Nathaniel Colemon, Nathan Woodard, Mehedi Al-Barkat, and Mohan Rao. "Evaluation and optimization of acoustics of a multipurpose room to improve speech intelligibility." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 264, no. 1 (June 24, 2022): 695–704. http://dx.doi.org/10.3397/nc-2022-800.

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The work presented in this paper was conducted as part of a student project in a senior course on Noise Control at Tennessee Tech. The project involved improving the acoustics of the multipurpose room in the university student center. There were repeated concerns regarding the poor acoustics conditions related with speech and intelligibility caused by excessive reverberations in the room. In order to solve this issue, an examination of the complete sound field in the room including reverberation time have been investigated with the aim of proposing solutions to improve the acoustics for future use. The evaluation of the room was done with both software simulation and experimental data obtained from on-site visit measurements. A comparison between the simulated and experimental data is presented and served as the basics for the analytical solutions necessary for acoustic optimization. Furthermore, renderings of possible mounting locations of acoustic panels with their specification have been provided based on the commercially available panels and cost consideration.

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Noda, Shinichi, Yoshitake Kamijo, Sueyoshi Mizuno, and Makoto Matsushita. "Prediction of Room Noise Caused by Vibration of High Power Elevator Traction Machine." WSEAS TRANSACTIONS ON ACOUSTICS AND MUSIC 8 (November 14, 2021): 16–20. http://dx.doi.org/10.37394/232019.2021.8.5.

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Total simulation from vibration of elevator motor to noise at sitting room with anti-vibration measures is confirmed in design stage. This procedure also presents decrease of acoustic noise in sitting room. In this simulation, FEM calculates wave motion, such as wave phase, interference, diffraction and natural frequency mode of sitting room wall. These procedures yield the ration between vibration of elevator motor and acoustic noise in sitting-room.

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Okawa, Yukiko, Haruka Matsuhashi, Izumi Tsunokuni, Yusuke Ikeda, and Yasuhiro Oikawa. "Machine-learning-based estimation of absorption coefficients from transfer functions modeled by equivalent sources." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 3 (February 1, 2023): 4413–19. http://dx.doi.org/10.3397/in_2022_0631.

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In the field of room acoustics, it is important to find the absorption coefficients of the wall surface, which is a boundary condition for modeling the room acoustic field. However, it is not easy to measure the acoustic impedances of the entire room because it requires many measurement points near the wall surface. Recently, a method to estimate the acoustic impedance and absorption coefficients by using both measurement and simulation methods has been proposed. However, a large number of measurement points are required to obtain sufficient estimation accuracy. In this study, we proposed estimation method of the sound absorption coefficients using machine learning with virtually increasing the number of microphones. First, the transfer functions at the virtual microphones are obtained from small number of transfer functions based on the sound field modeling by sparse equivalent sources. Then, the both transfer functions at the virtual and real microphones are used as the training data for machine learning. To evaluate estimation accuracy of the proposed method, we conducted the two-dimensional simulation experiments based on the boundary element method.

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Jeong, Jeong-ho. "Alarm Sound Propagation Characteristics of Gas Extinguishing System Installed in Computer Server Room." Journal of the Korean Society of Hazard Mitigation 20, no. 4 (August 31, 2020): 145–52. http://dx.doi.org/10.9798/kosham.2020.20.4.145.

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Gas extinguishing systems are used for fire protection in server rooms and data centers. In the fire safety standards (NFSC 106, 107) of gas extinguishing systems (carbon dioxide, halon, and clean agent extinguishing system), sound alarm devices are installed in each protected area to provide an effective warning to personnel in the protected area or areas with objects to be protected. By measuring the noise level generated in a small server room, it was found that more than 70 dB of noise was generated. Therefore, to effectively transmit alarm sound to workers in all areas within the protection area, such as a server room, an acoustic alarm device must be designed and installed so that an alarm sound is transmitted at a level of 15 dB or higher than the noise level generated by equipment installed in the facility. As a result of predicting the alarm sound through the room acoustic simulation for a small server room equipped with an acoustic alarm system in a cabinet-type gas extinguishing system, it was found that it was insufficient in effectively delivering an alarm sound to the entire protection area. To effectively transmit an alarm sound inside the protection area where a gas extinguishing system is installed, the output of the alarm device needs to be increased and the room acoustic parameters should be predicted in advance using room acoustic prediction techniques and actively adjusting the acoustics according to the noise generated inside the protection area. Additionally, the distance between alarm devices needs to be shortened to deliver sufficient alarm volume throughout the protection area, and it is necessary to establish specific standards for this.

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Fackler, Cameron, Jonathan Botts, and Ning Xiang. "Parallelized finite difference time domain room acoustic simulation." Journal of the Acoustical Society of America 132, no. 3 (September 2012): 1880. http://dx.doi.org/10.1121/1.4754895.

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González, Genaro, Albert Samper, and Blas Herrera. "ACOUSTIC SIMULATION OF THE CENTRAL HALL IN PALAU GÜELL BY GAUDÍ." Architecture and Engineering 6, no. 2 (2021): 18–30. http://dx.doi.org/10.23968/2500-0055-2021-6-2-18-30.

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Introduction: Quadric surfaces are commonly used in buildings due to their geometric ability to distribute and focus sound waves. The Central Hall in Palau Güell — a UNESCO World Heritage Site — is topped by an ellipsoidal dome. Antoni Gaudí envisaged this room as a concert hall where the organ and the dome play a lead role. Methods: The two previously mentioned elements are the main subject of our paper, which serves two purposes: 1) determining the values of the acoustic parameters of the hall through onsite measurement and also through simulation, and 2) using the geometric parameters of the quadric surface, which best fits the dome, in order to check whether it is possible to improve the acoustics of the hall by placing a new emission source at the focus of the dome’s ellipsoid. Results and Discussion: Contrary to the authors’ expectations, due to the focal reflection properties of the quadric surface, some acoustic parameters on the listening plane do not improve significantly. Therefore, we conclude that Gaudí took the acoustical impact into account when designing this hall.

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Lundén, Peter. "Uni‐Verse Acoustic Simulation System: interactive real‐time room acoustic simulation is dynamic 3D environments." Journal of the Acoustical Society of America 123, no. 5 (May 2008): 3937. http://dx.doi.org/10.1121/1.2936009.

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Chen, Ziqi, Kirill V. Horoshenkov, and Ning Xiang. "Bayesian inference for boundary admittance estimation using a multipole model for room-acoustic simulation." Journal of the Acoustical Society of America 150, no. 4 (October 2021): A348. http://dx.doi.org/10.1121/10.0008540.

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Acoustic surface admittance/impedance at room boundaries is essential for wave-based room-acoustic simulations. In this work, two levels of Bayesian inference are applied to estimate the surface admittance based on a multipole admittance model. This work estimates the order of the multipole admittance model through the high level of inference, Bayesian model selection. The first (low) level of inference, Bayesian parameter estimation, is applied to estimate the parameter values of the surface admittance model once model order is selected. This work approximates the frequency-dependent admittance from experimentally measured a set of acoustic surface admittance data. Analysis results demonstrate that multipole model-based Bayesian inference is well suited in estimating the frequency-dependent boundary condition within wave-based simulation framework. Numerical simulations verify the estimation results of Bayesian inference.

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Vorländer, Michael. "Virtual Acoustics." Archives of Acoustics 39, no. 3 (March 1, 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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Pratiwi, Radhiyah Ulfah, Anugrah Sabdono Sudarsono, Zaenal Muttaqin, and Supriyanto Supriyanto. "OPTIMIZING THE ACOUSTIC CONDITION OF A PYRAMIDAL-CEILING MOSQUE BASED ON SIMULATION." Journal of Islamic Architecture 7, no. 4 (December 30, 2023): 713–18. http://dx.doi.org/10.18860/jia.v7i4.19638.

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This study aims to optimize the acoustic condition of a pyramidal ceiling mosque utilizing a simulation approach. The simulation was done using I-Simpa, simulating the room acoustic parameters of 15 m x 15 m x 5 m and a 5 m roof height of a mosque. The optimization was accomplished by varying the occupancy level and using absorbent materials. The best acoustic condition was defined as having a high level of speech intelligibility (C-50 > -2 dB) yet the longest possible reverberation time, especially at 500-4000 Hz. The simulation indicates that the speech intelligibility value increases with the number of filled rows, both with and without sound-absorbing material. On the other hand, the reverberation time is unaffected by the number of filled rows and is extended by using sound-absorbing materials. Hence, without sound-absorbing ceiling material, optimal conditions are attained when the mosque is fully occupied. Meanwhile, using sound-absorbing materials on the mosque's ceiling establishes optimal acoustic conditions for all occupancy levels. It demonstrates that using sound-absorbing materials improves the acoustic quality of the pyramidal-ceiling mosque.

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Aspöck, Lukas, and Michael Vorländer. "Differences between measured and simulated room impulse responses." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 4 (February 1, 2023): 3209–17. http://dx.doi.org/10.3397/in_2022_0451.

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Simulation models based on geometrical acoustics mostly do not immediately deliver a simulated room impulse response, but intermediate results such as an energy histogram or an energy decay curve. At this point, further models are required to generate a room impulse response of the simulated environment, which are essential for the process of auralization. While for various simulated scenarios, the application of a reflection model based on a basic theory is sufficient, detailed comparisons of simulated and measured room impulse responses reveal differences which are attributed to the lack of diffuse reflections in the applied reflection model. These deviations can also substantially affect derived room acoustic parameters. This work presents and explains the shortcomings and discusses potential improvements to be considered in the simulation process.

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Pätynen, Jukka, and Tapio Lokki. "Evaluation of Concert Hall Auralization with Virtual Symphony Orchestra." Building Acoustics 18, no. 3-4 (December 2011): 349–66. http://dx.doi.org/10.1260/1351-010x.18.3-4.349.

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Authenticity of the simulation of room acoustics is evaluated by comparing auralizations with real recordings. Impulse responses are recorded in two concert halls with 34 loudspeakers positioned on the stage in the shape of an orchestra and a 3D microphone probe for spatial reproduction. The acoustics of the same concert halls are simulated with acoustics modeling software. B-format impulse responses are calculated by using the identical source and receiver positions as in the real halls. Additionally, two processing methods are applied to the simulated responses in order to decrease the difference in acoustical impression. Objective room acoustic parameters between the real and simulated halls are compared, and a listening test utilizing convolutions with anechoic orchestral music is organized. The results suggest that the subjects can be categorized in two groups having preference of brightness or naturalness. Depending on the music style, auralizations with processed responses are assessed equal or better than the real hall in terms of instrument balance and brightness.

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Wang, Zhi Jian, and Chao Gang Fan. "The Simulation and Experimental Research on Reverberation Time in Car Speaker Sound Field." Applied Mechanics and Materials 229-231 (November 2012): 1777–80. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.1777.

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As an important element of the index in room acoustics, the reverberation time has been considered as an objective parameter with clear concept and had good correlation with the subjective perceptions in the field of psycho-acoustic criteria. Through the computer acoustic simulation software EASE and the electro-acoustic test system CLIO, this paper conducts research on the reverberation time of the car speaker sound field, which in the domestic car of a certain type, studies show that EASE is accurate and reliable in the simulation of the car speaker sound field, the reverberation time is greater than 0.4s when the frequency less than 500 HZ and less than 0.1s when the frequency greater than 1000 HZ, when reaches to 500 HZ, the reverberation time reaches the maximum 1.103s.

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Zhang, Jiahua, Juan Navarro, Ning Xiang, and Mélanie Nolan. "Finite-difference diffusion-equation modeling of reverberation chambers in time-domain." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A252. http://dx.doi.org/10.1121/10.0016179.

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Conventional chamber-based methods of random incidence absorbing coefficients overlook the non-diffused sound field in the room acoustics, which decreases accuracy and may even lead to conflicting results. This work applies the diffusion equation model to room-acoustic simulations of standardized reverberation chambers. The simulations can more efficiently capture the chamber's non-diffuse sound field and energy flows than wave-based simulation models. The diffusion equation represents the governing equation of reverberant sound energy densities within the reverberation chamber which is solved using the finite-difference time-domain method. Its computational efficiency of diffusion equation-based modeling lies in a highly sparse domain meshing condition dictated by the mean-free path length rather than wavelengths and still derives a wideband simulation result. This work also dedicates the effort to reexamine the meshing condition, particularly for standardized finite sizes of sound absorbers for measurements of random incidence absorption coefficients. By comparing the outcomes of simulations with measurement data, an a posteriori absorption coefficient is inversely estimated involving Bayesian parameter estimation.

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TSUBOI, Masayoshi, Mitstoshi WATANABE, and Shigeru HIRANO. "A ROOM ACOUSTIC SIMULATION SYSTEM CONSIDERED WAVE MOTION CHARACTERISTIC." AIJ Journal of Technology and Design 2, no. 2 (1996): 121–26. http://dx.doi.org/10.3130/aijt.2.121.

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Escolano-Carrasco, José. "Contributions to discrete-time methods for room acoustic simulation." Journal of the Acoustical Society of America 124, no. 6 (December 2008): 3359. http://dx.doi.org/10.1121/1.3020605.

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McKelvie, Kent, and Aaron Kanapesky. "Architectural improvements to increase reverberation and reduce flutter echo in two music rehearsal rooms." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A22. http://dx.doi.org/10.1121/10.0015412.

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New music rehearsal rooms at a small college suffered from flutter echo and very short reverberation times. The architecture of these rooms included visually elegant designs which the college wanted to retain if feasible. We coordinated with the college, the architect, and a wood worker to develop concept ideas for improvement which would be cost effective and retain the elegant architectural. By using finite difference time domain (FDTD) simulation and mock-up listening tests, we evaluated the acoustic properties of these concept options. After completion of these tests and simulations, a design was implemented in each room based on acoustic performance and visual impact. We will present measurement results pre- and post-renovation, along with our methodology used for the FDTD analysis and mockup testing.

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Algargoosh, Alaa, and Ahmed Allam. "Parametric analysis of the impact of geometry on room modes at low frequencies using wave-based simulation." Journal of the Acoustical Society of America 153, no. 3_supplement (March 1, 2023): A22. http://dx.doi.org/10.1121/10.0018015.

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Room modes at low frequencies strongly influence the perception of sound in a room, which can enhance or deteriorate the acoustic experience. Previous research showed that low-frequency modes are also linked to the emotional impact of the acoustic environment; this link calls for further understanding of the effect of resonance at low frequencies on sound perception. However, most auralization software programs adopt geometric-based simulations, which are not accurate at low frequencies. In this work, we adopt wave-based simulations to characterize room modes at low frequencies depending on the room geometry through a parametric analysis. The study outlines the contribution of architectural elements, such as domes and sub-volumes, in shaping the acoustic environment by manipulating low frequencies.

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Kraxberger, Florian, Eric Kurz, Werner Weselak, Gernot Kubin, Manfred Kaltenbacher, and Stefan Schoder. "A validated finite element model for room acoustic treatments with edge absorbers." Acta Acustica 7 (2023): 48. http://dx.doi.org/10.1051/aacus/2023044.

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Porous acoustic absorbers have excellent properties in the low-frequency range when positioned in room edges, therefore they are a common method for reducing low-frequency reverberation. However, standard room acoustic simulation methods such as ray tracing and mirror sources are invalid for low frequencies in general which is a consequence of using geometrical methods, yielding a lack of simulation tools for these so-called edge absorbers. In this article, a validated finite element simulation model is presented, which is able to predict the effect of an edge absorber on the acoustic field. With this model, the interaction mechanisms between room and absorber can be studied by high-resolved acoustic field visualizations in both room and absorber. The finite element model is validated against transfer function data computed from impulse response measurements in a reverberation chamber in style of ISO 354. The absorber made of Basotect® is modeled using the Johnson-Champoux-Allard-Lafarge model, which is fitted to impedance tube measurements using the four-microphone transfer matrix method. It is shown that the finite element simulation model is able to predict the influence of different edge absorber configurations on the measured transfer functions to a high degree of accuracy. The evaluated third-octave band error exhibits deviations of 3.3–4.1 dB computed from third-octave band averaged spectra.

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Li, Qian, and Dong Sheng Liu. "Research on Improving Room Sound Field of Exhibition Building." Advanced Materials Research 1065-1069 (December 2014): 1634–37. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.1634.

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Generally, there is a high background noise and long reverberation time and poor speech intelligibility in exhibition space due to its big crowd and often commercial promotional activities so that communication is very hard, commercial activities broadcasting system is also difficult to ensure that customers can clearly hear the propaganda content. In this paper, through measured background noise of the new exhibition center in Chengdu, we found the acoustic problem in exhibition space, then we did simulation analysis in some exhibition building and took some acoustical process to get a good sound field.

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Horst Andrade, Fernanda, Rodrigo Scoczynski Ribeiro, and Manuel Teixeira Braz César. "Analysis of the acoustical environment of classrooms in three brazilian public schools through measurements and 3d simulation." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 6 (August 1, 2021): 91–99. http://dx.doi.org/10.3397/in-2021-1132.

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The present study analyses the outdoor and indoor sound pressure levels (SPL) and the reverberation time (RT) measured in three Brazilian public classrooms. For the SPL, a sound level analyzer (class II) was used, and for the RT it was used a smartphone for the measurements. The sound sources were the impulses of bursting balloons and the data was processed in a MatLab toolbox (ITA-Toolbox). The classrooms were also simulated in an open source modeling software (I-SIMPA), using ray-tracing principles. Based on the results of the simulations, supported by the low-cost measurements, it was observed that the classroom didn't reach the national standards for classroom acoustics. Some improvements were designed with sustainable materials in order to reach the lower limits of the standards using the same room acoustics software. It was observed that the low-cost measurements helped on the diagnosis of classroom's acoustic issues which was also verified in the 3D simulation. This procedure showed itself as a cheap solution for classroom acoustic designs.

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Llopis, Hermes Sampedro, Christina Kjær, Allan P. Engsig-Karup, and Cheol-Ho Jeong. "Just noticeable difference for simulation accuracy between full and reduced order models (L)." Journal of the Acoustical Society of America 155, no. 1 (January 1, 2024): 94–97. http://dx.doi.org/10.1121/10.0022382.

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Model order reduction techniques significantly reduce the computational time when performing accurate room acoustic simulations with numerical methods that inherently include all the wave phenomena. There is a clear trade-off between physical accuracy and acceleration, but how humans perceive these errors is unknown. This study aims to investigate physical error limit that does not induce perceptual differences. Various two-dimensional rooms and reverberation times are tested with a three-alternative forced-choice listening test. Results reveal that for the presented cases, the threshold stands between a relative root mean square error of 1% and 0.1%, where the reduced order model stimulus results in a statistically significant difference.

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Costantini, G., and A. Uncini. "Real-time room acoustic response simulation by IIR adaptive filter." Electronics Letters 39, no. 3 (2003): 330. http://dx.doi.org/10.1049/el:20030185.

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Cheng, Zuofu, and Lippold Haken. "Real‐time interactive room acoustic simulation engine using graphics processors." Journal of the Acoustical Society of America 128, no. 4 (October 2010): 2410. http://dx.doi.org/10.1121/1.3508598.

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Fagerlande, Guilherme C., Julio Cesar B. Torres, and Maria Lygia A. Niemeyer. "Acoustic simulation in an orchestra rehearsal room using BRASS software." Journal of the Acoustical Society of America 146, no. 4 (October 2019): 2802. http://dx.doi.org/10.1121/1.5136704.

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Ahnert, Wolfgang, Stefan Feistel, and Steffen Bock. "Prediction of scattering coefficients for use in room‐acoustic simulation." Journal of the Acoustical Society of America 120, no. 5 (November 2006): 3010. http://dx.doi.org/10.1121/1.4787035.

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Journal articles on the topic 'Room Acoustic Simulation'

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