Visualizations of sound energy across coupled rooms using a diffusion equation model

Jing, Yun; Xiang, Ning

doi:10.1121/1.3008066

Cited by 25 publications

(25 citation statements)

References 11 publications

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“…Alternative geometries commonly seen in single volume halls, such as fan-shape and vineyard styles, could also be studied. Different modeling methods, such as physical scale modeling, radiative transfer models, 32,33 diffusion models, 34,35 and finite difference time-domain methods, 36 could be used to make additional conclusions about the influence of architectural parameters on DSE and its subjective impression. Aspects of the subjective response to DSE could be further investigated as well.…”

Section: Discussionmentioning

confidence: 99%

Optimum absorption and aperture parameters for realistic coupled volume spaces determined from computational analysis and subjective testing results

Bradley

Wang

2010

The Journal of the Acoustical Society of America

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This project utilizes computational modeling to study the effects of varying two architectural parameters, absorption ratio and aperture size, in a realistic coupled volume concert hall. Coupled volumes have been shown to exhibit non-exponential sound energy decay profiles, referred to as double slope effect. A number of objective metrics ͑T30/T15, LDT/T10, decay ratio, and ⌬L͒ have been used to quantify the double slope effect of the profiles generated in the virtual hall. T30/T15 and LDT/T10 showed similar trends across all hall configurations, indicating decreasing double slope effect with increasing coupled volume absorption ratio for each aperture size, and producing highest values at a specific aperture size for each absorption ratio. Generally, LDT/T10 provides finer resolution than T30/T15 when analyzing the decay profiles in this study. Results from the two metrics derived from Bayesian analysis, decay ratio and ⌬L, seem less consistent. Subjective testing has also been conducted to determine the effect of varying the two architectural parameters in the hall, and multidimensional scaling analysis shows that, in general, listener preference is inversely proportional to the level of double slope effect, with the highest levels of preference occurring at low and medium levels of double slope effect. Recommended design guidelines for coupled volume halls are provided based on these computational and subjective results.

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Section: Discussionmentioning

confidence: 99%

Optimum absorption and aperture parameters for realistic coupled volume spaces determined from computational analysis and subjective testing results

Bradley

Wang

2010

The Journal of the Acoustical Society of America

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“…Due to its scattering properties, it is rarely used in the field of measurement. According to the theory of reverberation, high frequency reverberation is easy attenuate, while the low frequency reverberation decay time is long, and the attenuation process is smooth [17,18]. In the early stage of the decoking, the contact point of the water jet on the coke layer is far away from the drum wall.…”

Section: Principles Of Reverberation In Closed Coke Drummentioning

confidence: 99%

“…Therefore, according to the definition of the mean sound absorption coefficient [17], can be expressed as follows:…”

Section: Principles Of Reverberation In Closed Coke Drummentioning

confidence: 99%

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Method for Detecting the Inside of Coke Drum Using Acoustic Signals

et al. 2017

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A distance and acoustic intensity reverberation (DAIR) physical model is developed that can be successfully applied to the signal processing of the hydraulic decoking process online monitoring. In this model, the transmission characteristics of acoustic signals generated by a moving sound source in a dynamic confined space are first analyzed using data recursion and correction according to the coordinate continuity in adjacent area and adjacent time. The results show that the nondetection zone of acoustic signals generated directly by the impact of water is eliminated, and the surface distribution of coke in the drum can be mapped in real time.

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“…It reliably models the gradual transition both in terms of sound pressure level (see Figure 5) and in terms of sound decays through the aperture. Jing and Xiang [46] used the diffusion model to study the energy flow from one room to another as a function of the time. It permits to observe that, for doublesloped decays, the energy flows back from the adjacent room to the source room.…”

Section: Spl (Db)mentioning

confidence: 99%

Acoustic Predictions in Industrial Spaces Using a Diffusion Model

Billon

Picaut²,

Valeau

et al. 2012

Advances in Acoustics and Vibration

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Industrial spaces are known to be very noisy working environment. This noise exposure can be uncomfortable, tiring, or even harmful, at worst. Industrial spaces have several characteristics: they are often huge flat volumes fitted with many obstacles and sound sources. Moreover, they are usually surrounded by rooms where low noise levels are required. The existing prediction tools can seldom model all these phenomena accurately. In this paper, a prediction model based on a diffusion equation is presented. The successive developments carried out to deal with the various propagating phenomena met in industrial spaces are shown. For each phenomenon, numerical or experimental examples are given to highlight the validity of this model. It is also shown that its computation load is very little in comparison to ray-tracing-based methods. In addition, this model can be used as a reliable and flexible tool to study the physics of the coupling between rooms. Finally, an application to a virtual factory is presented.

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Visualizations of sound energy across coupled rooms using a diffusion equation model

Cited by 25 publications

References 11 publications

Optimum absorption and aperture parameters for realistic coupled volume spaces determined from computational analysis and subjective testing results

Optimum absorption and aperture parameters for realistic coupled volume spaces determined from computational analysis and subjective testing results

Method for Detecting the Inside of Coke Drum Using Acoustic Signals

Acoustic Predictions in Industrial Spaces Using a Diffusion Model

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