Noise Calculation Method for Industrial Premises with Bulky Equipment at Mirror-diffuse Sound Reflection

Tsukernikov, Ilya; Antonov, A. I.; Ledenev, V I; Shubin, Igor; Nevenchannaya, Tatiana

doi:10.1016/j.proeng.2017.02.291

Cited by 9 publications

(2 citation statements)

References 7 publications

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“…The reflection (absorption) of sound waves is affected by several parameters, such as surface shapes, obstacles and their spatial distribution, their distance and arrangement [ 13 ]. In addition to these, one of the most important factors that has a significant effect on the proper propagation of sound is the material, including its porosity, density, thickness, and the angle of sound incidence, surface shape, excitation frequency of the acoustic wave and the type of internal structure of the material [ 1 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of 3D-Printed PLA Structure on Sound Reflection Properties

et al. 2022

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3D printing technique is currently one of the promising emerging technologies. It is used in many areas of human activity, including acoustic applications. This paper focuses on studying the sound reflection behavior of four different types of 3D-printed open-porous polylactic acid (PLA) material structures, namely cartesian, octagonal, rhomboid and starlit structures. Sound reflection properties were evaluated by means of the normal incidence sound reflection coefficient based on the transfer function method using an acoustic impedance tube. In this study, various factors affecting the sound reflection performance of the investigated PLA samples were evaluated. It can be concluded that the sound reflection behavior of the tested PLA specimens was strongly affected by different factors. It was influenced, not only by the type of 3D-printed open-porous material structure, but also by the excitation frequency, the total volume porosity, the specimen thickness, and the air gap size behind the tested specimen inside the acoustic impedance tube.

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Section: Introductionmentioning

confidence: 99%

Effect of 3D-Printed PLA Structure on Sound Reflection Properties

et al. 2022

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“…(2) and(3). For this reason, the purpose of the present paper is the estimation of possible change of numerical coefficient of Eq.…”

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Coupling Coefficient of Flux Density and Density Gradient of Reflected Sound Energy in Quasi-Diffuse Sound Fields

Antonov

Ledenev

Nevenchannaya

et al. 2019

J. Theor. Comp. Acout.

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Sound pressure levels in rooms are determined by the energy of direct sound and the energy generated by reflections of sound from enclosures. In some areas of a room, the reflected sound energy exceeds the energy of the direct sound. For this reason, calculations of the energy characteristics of reflected sound energy are of great importance. In most rooms, the reflection of sound from enclosures has a specular-diffuse character. In this case, one part of the reflected energy transferred by specular reflected waves is distributed according to the laws of geometric acoustics, and the other part, scattered diffusely, according to Lambert’s law. The calculation of the specular component of the reflected energy is made by the methods of ray tracing, and the scattered energy is calculated by the statistical energy methods developed by the authors for the quasi-diffuse sound fields of the rooms. The basis of the latter methods is the relationship between the flux density of reflected sound energy and the density gradient of this energy. The accuracy of these methods depends on the accuracy of the adopted value of the coupling coefficient between the flux density and the density gradient of the reflected sound energy. Currently, there are different ideas about its magnitude. The paper presents the results of studies of coupling coefficients with regard to space-planning and acoustic characteristics of premises. The investigations were carried out using Kuttruff’s integral equation. Based on the results obtained, recommendations are given on the choice of the coupling coefficient.

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