Comparative Evaluation of Ray Tracing and Diffusion Equation Modeling in Room Acoustics Design of Subway Stations

Gül, Zühre Sü; Odabaş, Erinç; Çalışkan, Mehmet

doi:10.1007/s40857-020-00179-1

Cited by 8 publications

(6 citation statements)

References 27 publications

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“…It reduces with the distance; this trend correlates with some theories [4]. The presented results reveal the need to improve the theory of sound propagation in the long room with sound absorbing treatment for reliable predictions of acoustic conditions in different rooms including large public spaces [12,15].…”

Section: Discussionsupporting

confidence: 75%

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Sound propagation in an anechoic long room

Kanev

2022

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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Sound propagation in a shooting gallery has been studied experimentally. The gallery is a long room with a ceiling and walls covered by sound absorbing materials. The sound attenuation along the room and the reverberation time were measured and analyzed. It was found that sound level decreased lineally with a distance from a source with the attenuation coefficient 0.5-1 dB/m. The reverberation time is 0.2-0.4 s at middle frequencies and it is not constant along the room. The experimental results are compared with the simulation in ODEON. It is found that the measured and calculated sound decays are very different. The linear sound decreasing coincides with the theory of sound propagation in ducts, whereas the sound field in the simulated room behaves like in free space.

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Section: Discussionsupporting

confidence: 75%

“…To describe the sound propagation in them one can use the theory of ducts with impedance walls [1] or other classical approaches [2,3]. Today the theory of sound field in long rooms is being intensively developed [4][5][6][7][8][9][10][11][12]. At the same time, we can observe a lack of experimental data for fullscale rooms.…”

Section: Introductionmentioning

confidence: 99%

Sound propagation in an anechoic long room

Kanev

2022

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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“…In order to improve the accuracy of computations in long enclosures, many studies have been conducted. Whether DEM or ray-tracing simulated RIRs are much closer to the real measurements is a research question that was previously discussed for metro stations [19]. The applicability of diffusion coefficient for such long spaces has been an argument of some other research.…”

Section: Generative Geometric Formsmentioning

confidence: 94%

A Comparative Analysis of Diffusion Model and Ray Tracing in Room Acoustics through Generative Geometric Forms

Sü Gül

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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Room acoustics design of various spaces of different forms and functions necessitates reliable tools of analysis. Computer-aided simulations have replaced physical models, since 1960s, in both research and mostly in practice, due to both time and cost efficiency. There are various room acoustics modeling approaches in sound field analysis. Different methods have different strengths and weaknesses. This study aims to compare diffusion model (DEM) to ray-tracing, to investigate potentials or shortages of both techniques, and coherence to one another in quantification of basic acoustical parameters but as well in visualization of sound propagation in rooms. This research uses primitive geometric forms and their different combinations. Produced ten different geometric entities, which may well represent a real architectural space, are then utilized to produce room impulse responses in a ray-tracing simulation and as well in a diffusion equation model computation. Identical source-receiver configurations and material input are used for controlled experiments. T30 values and relative sound energy level differences are compared. Energy flow vectors are traced in timedependent solutions of DEM, to check the characteristics of energy distribution within different geometric domains. Materials are varied over specific surfaces to check the consequence of inhomogeneous absorption for investigated methods.

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“…When applying the acoustic diffusion equation (ADE) model to underground space, the predicted sound pressure level (SPL) attenuation is often not sufficiently accurate, with the value being lower at the later stage [ 19 ]. However, under the same conditions aboveground, the ADE model has obvious advantages in computing speed compared with other acoustic prediction methods [ 18 , 19 ]. How to further improve the prediction accuracy while exploiting this advantageous computational efficiency has become an important research question.…”

Section: Introductionmentioning

confidence: 99%

An Improved Acoustic Diffusion Equation Model for Long-Channel Underground Spaces

Mou,

Yang,

Xing

et al. 2023

Sensors

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The acoustic diffusion equation model has been widely applied in various scenarios, but a larger prediction error exists when applied to underground spaces, showing a significantly lower characteristic of the sound pressure level in the later stage compared to field tests since underground spaces have a more closed acoustic environment. Therefore, we analyze the characteristics of underground spaces differentiating from aboveground spaces when applying the model and propose an improved model from the perspective of energy balance. The energy neglected in the calculation of the acoustic diffusion equation model is compensated in long channel underground spaces named “acoustic escape compensation”. A simulation and two field experiments are conducted to verify the effectiveness of the proposed compensation strategy in long-channel underground spaces. The mean square error is used to evaluate the differences between the classical model and the improved model, which shows a numerical improvement of 1.3 in the underground field test. The results show that the improved model is more suitable for describing underground spaces. The proposed strategy provides an effective extension of the acoustic diffusion equation model to solve the problem of sound field prediction and management in underground spaces.

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Comparative Evaluation of Ray Tracing and Diffusion Equation Modeling in Room Acoustics Design of Subway Stations

Cited by 8 publications

References 27 publications

Sound propagation in an anechoic long room

Sound propagation in an anechoic long room

A Comparative Analysis of Diffusion Model and Ray Tracing in Room Acoustics through Generative Geometric Forms

An Improved Acoustic Diffusion Equation Model for Long-Channel Underground Spaces

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