Effect of model simplification through manual reduction in number of surfaces on room acoustics simulation

Jalil, Nurul Amira Abd; Din, Nazli Bin Che; Keumala, Nila; Razak, Asrul Sani

doi:10.22452/jdbe.vol19no3.4

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…Removing furniture and small surfaces (GR4, all furniture and surfaces < 0.4m 2 ) does not have a significant impact. These findings align with a study by Abd Jalil et al [15], which suggests that removing small surfaces has little effect on acoustic parameters in open-plan office rooms. As long as a room's larger surfaces are presented, geometrical acoustics can provide acceptable auralisation results.…”

Section: Discussionsupporting

confidence: 92%

Comparing Online vs. Lab-based Experimental Approaches for the Perceptual Evaluation of Artificial Reverberation

Martin,

Picinali

2024

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

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A common approach for reproducing room acoustics effects is geometrical acoustics. The accuracy of such an approach is tied, among other variables, to the geometrical accuracy of the simulated room, and to the information regarding the absorption coefficients of its materials. However, from a perceptual standpoint, a model that accounts for all of a room's features would come at a high computational cost and could be redundant. As a result, a compromise can be reached between the perceived quality (e.g. authenticity, immersion, etc.) of the replicated room effect and the model's complexity. The purpose of this study is to look into the perceptual impact of simplifying the room geometry and minimizing the number of materials' absorption coefficients. Two separate experiments were conducted, both based on the MUSHRA methodology: one was run in a controlled lab environment through a Virtual Reality (VR) headset, while the other was run through a web-based interface. This paper focuses on the differences between the two protocols' impact on the results. It appears that the online-based experiment, notwithstanding the lack of control of the playback system and environment, and the participants' likely limited attention, produced minor but substantial differences with the results of the VR experiment.

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Section: Discussionsupporting

confidence: 92%

Comparing Online vs. Lab-based Experimental Approaches for the Perceptual Evaluation of Artificial Reverberation

Martin,

Picinali

2024

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

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“…In addition, it involves a water tightness test of the room through tracing rays in the 3D Investigate Rays or 3D Billiard window, as depicted in Figure 2, to ensure that the room model is entirely enclosed. All architectural details such as an ornament, cornice, and framing were not included in the room modeling because such details do not produce any strong early reflections to the receiver (Jalil et al, 2019).…”

Section: Methods Simulation Set-upmentioning

confidence: 99%

Evaluation of Acoustical Performance for Atrium Design with Respect to Skylight Geometry and Material in the Tropics

Din¹,

Soon²

2022

JST

Self Cite

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Atriums, in most conditions, are considered the heart of buildings, the main spaces where different functions and activities are held. Nowadays, various atrium designs are incorporated in the building, varying from pyramidal to barrel vault. Therefore, it is of great importance to study the basic characteristics of sound fields in such spaces and their related materials. This research aims to determine the effect of various skylight geometry configurations on the atrium’s acoustical performance. Next, an acoustical performance evaluation of the effect of skylight materials was performed by using computer simulation. Four selected atriums with different types of skylight geometries modeling and respective materials, i.e., glass, polycarbonate, and acrylic, have been used in this acoustical simulation. From the results, it can be concluded that an atrium with a pyramidal skylight provides a better reverberation time for music purposes. In contrast, all atriums’ models’ speech transmission index values were almost identical. However, no significant acoustical performance can be found in different used materials. The result also indicates that the shape of the atrium has a higher effect on the acoustical performance than the different materials used.

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“…The 3D models for both lecture rooms were produced using Sketchup Pro® software before the verification process, as shown in Figure 6. According to Jalil et al (2019), reduction of surface areas of about 80% for ODEON simulation model simplification is acceptable. Nevertheless, the percentage of surface reduction varied according to some factors that might affect the validity of the results such as individual modelling techniques, model settings in the simulation software, and the accuracy of scattering as well as the absorption coefficient of the materials.…”

Section: D Modelling and Verificationmentioning

confidence: 99%

Investigation of the Acoustics Performance of the University’s Lecture Rooms by using Economical and Feasible Design Improvement Strategies

Razali,

Che Din,

Hamdan

2023

JDBE

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Students encounter difficulties in speech comprehension because of unfavorable classroom acoustics conditions, which subsequently affect their cognitive development and academic performance. Therefore, optimal listening conditions are required to ensure that listeners perceive and recognize speech effectively. This invites numerous studies to explore plausible acoustic interventions and treatments as an initiative to remediate the issue. Thus, this study seeks to a) identify the actual acoustic conditions in two (2) classrooms in the Faculty of Built Environment, Universiti Malaysia Sarawak, and b) establish economical acoustic design strategies for future improvements. This quantitative study embarks on on-site acoustic measurements to evaluate the reverberation time and background noise level of the selected classrooms. The data from the on-site measurement is applied for 3D model verification for the simulation process. The establishment of plausible design treatment alternatives is further analyzed through simulation using ODEON software. The simulation process yielded the effects of a) material surface treatment and b) sound field amplification systems on several acoustic parameters. The findings reveal that the surface treatment using low-cost material and the installation of sound field amplification significantly enhanced the classroom acoustic quality and are feasible to be implemented for future improvements.

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Effect of model simplification through manual reduction in number of surfaces on room acoustics simulation

Cited by 6 publications

References 15 publications

Comparing Online vs. Lab-based Experimental Approaches for the Perceptual Evaluation of Artificial Reverberation

Comparing Online vs. Lab-based Experimental Approaches for the Perceptual Evaluation of Artificial Reverberation

Evaluation of Acoustical Performance for Atrium Design with Respect to Skylight Geometry and Material in the Tropics

Investigation of the Acoustics Performance of the University’s Lecture Rooms by using Economical and Feasible Design Improvement Strategies

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