Experimental and numerical study on the propagation of impulsive sound around buildings

Remillieux, Marcel C.; Corcoran, Joseph M.; Haac, Ryan; Burdisso, Ricardo A.; Svensson, U. Peter

doi:10.1016/j.apacoust.2012.04.011

Cited by 16 publications

(6 citation statements)

References 15 publications

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“…2 Also, comparisons between the boundary element method and an edge diffraction based formulation indicate the efficiency of the latter approach for outdoor sound propagation studies. 3 The field diffracted by an infinite wedge of arbitrary wedge angle, under point source excitation, is known to have a number of equivalent exact closed-form representations. Frequency-domain expressions include line integral formulations and infinite series expansions, [4][5][6] and time-domain expressions are also available in explicit forms, 7 referred to here as the BT-solution.…”

Section: Introductionmentioning

confidence: 99%

The diffracted field and its gradient near the edge of a thin screen

Hewett

Svensson

2013

The Journal of the Acoustical Society of America

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The secondary edge source line integral formulation for diffraction modeling uses edge sources with a 1/r dependency, in addition to a directivity function. At first sight, this might seem to contradict the expected 1/r behavior for the gradient near the edge of a thin screen. An analysis is presented for the special case of perpendicular plane wave incidence onto a thin screen, which shows that the secondary edge source formulation does indeed lead to the expected behavior close to the edge of an ideal wedge.

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Section: Introductionmentioning

confidence: 99%

The diffracted field and its gradient near the edge of a thin screen

Hewett

Svensson

2013

The Journal of the Acoustical Society of America

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“…Hybrid and anomalous diffusive transport mechanisms are pervasive also in acoustics. This type of transport can arise when acoustic fields propagate in a highly scattering medium such as a urban environment [22,23], a forest [24,25], a stratified fluid (e.g. the ocean) [26][27][28], or a porous medium [4,[29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Occurrence of anomalous diffusion and non-local response in highly-scattering acoustic periodic media

2019

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We investigate the occurrence of anomalous diffusive transport associated with acoustic wave fields propagating through highly-scattering periodic media. Previous studies had correlated the occurrence of anomalous diffusion to either the random properties of the scattering medium or to the presence of localized disorder. In this study, we show that anomalous diffusive transport can occur also in perfectly periodic media and in the absence of disorder. The analysis of the fundamental physical mechanism leading to this unexpected behavior is performed via a combination of deterministic, stochastic, and fractional-order models in order to capture and illustrate the different elements contributing to this phenomenon. Results indicate that the anomalous transport can indeed occur in perfectly periodic media when the dispersion behavior is characterized by anisotropic (partial) bandgaps. In selected frequency ranges, the propagation of acoustic waves not only becomes diffusive but its intensity distribution acquires a distinctive Lévy α-stable profile having pronounced heavy-tails. In these ranges, the acoustic transport in the medium occurs according to a hybrid transport mechanism which is simultaneously propagating and anomalously diffusive. We show that such behavior is well captured by a fractional diffusive transport model whose order can be obtained by the analysis of the heavy tails.

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“…The only literature based Matlab simulation regarding noise propagation is shown in [12] dealing only with impulsive sound around buildings although the open source software I-SIMPA proposed in [13] has capabilities on environmental noise and industrial noise but no suggestion on noise sources placement for a fixed surrounding.…”

Section: Assessment Of a Single Discharge Nozzle As Noise Sourcementioning

confidence: 99%

Modelling of noise reduction for Datacentre buildings fire protection with inert gas systems

Mihalache¹,

Bigan

Panduru

et al. 2019

MATEC Web Conf.

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Regarding INERGEN Clean gas Total Flood Fire Suppression System, these systems are specifically engineered for total flooding application in either unoccupied or occupied areas, but against its design, or their proved long term efficiency and global scale usage, since INERGEN agent is stored as a gas, it discharges as an invisible gas that can have a more destroying impact than the fire itself. Since 2008 up to now, there have been recorded on yearly basis several reports about INERGEN gas discharges conducting to faults in hard discs (HDD) operating in Data Centres protected by such a solution from fire due to the level of noise produced. The paper shows an analysis of this problem as hard disks damaging source detection and optimization by modelling of nozzle placement in the space choice as a technical solution to avoid these fire extinguisher side effects.

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Experimental and numerical study on the propagation of impulsive sound around buildings

Cited by 16 publications

References 15 publications

The diffracted field and its gradient near the edge of a thin screen

The diffracted field and its gradient near the edge of a thin screen

Occurrence of anomalous diffusion and non-local response in highly-scattering acoustic periodic media

Modelling of noise reduction for Datacentre buildings fire protection with inert gas systems

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