The effect of construction material, contents and room geometry on the sound field in dwellings at low frequencies

Maluski, Sophie; Gibbs, B.M.

doi:10.1016/s0003-682x(03)00116-6

Cited by 18 publications

(12 citation statements)

References 5 publications

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“…For this model, the obtained natural frequencies from the plate theory assumption are [7] ω n = π 2 B ρ s 1/2 n y πy l y 2 + n z πz l z 2 (8) where l y and l z are the panel dimensions, B the bending stiffness, and ρ s the mass per unit area. To consider the fluid-structure interaction, the fluid pressure acting on the interface is added to the structural dynamic equation, and then the discretized dynamic equation of the structure is [17] […”

Section: Structural-acoustic Fieldmentioning

confidence: 99%

“…The results showed that the sound insulation at low frequencies depends on the party wall properties and the geometry and dimensions of the contiguous rooms. Maluski and Gibbs [6][7][8] modelled sound transmission between adjacent rooms using the finite-element method (FEM). They investigated the dependency of sound-insulation characteristics of a party wall at low frequencies strongly with the modal characteristics of the sound field of both rooms and of the partition with different boundary conditions.…”

Section: Introductionmentioning

confidence: 99%

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Sound transmission between partitioned contiguous enclosures

Hosseini‐Toudeshky

Mofakhami

Yarmohammadi

2009

Proceedings of the Institution of Mechanical Engineers, Part C:

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By increasing the application of lightweight constructions, sound transmission between the adjacent enclosures becomes a more important consideration in designing new buildings. In this article, the parameters that may significantly affect the sound transmission level through a partition between two adjacent enclosures are investigated, i.e. geometrical dimensions, arrangement of enclosures, boundary conditions, multi-layered partitions, and framed (or reinforced) conditions of the partitions. For this purpose, sound transmission is modelled using the finite-element method. The obtained results from sound transmission using Perspex party walls with different width and boundary conditions are compared with those obtained from a double-layered wall with an air layer. The effects of an enclosure's arrangements and dimensions on sound transmission of the party walls are also studied. Using the cross-framed party wall causes more noise reduction than the double-layered party wall. The results also show that sound transmission between rooms with an asymmetric arrangement is less than that obtained from a symmetric configuration.

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Section: Structural-acoustic Fieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sound transmission between partitioned contiguous enclosures

Hosseini‐Toudeshky

Mofakhami

Yarmohammadi

2009

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The fluctuations are about a mean shift of 0dB below 50 Hz and 2 dB above 50 Hz. Room contents can be assumed 'transparent' to sound if the ratio of wavelength to obstacle dimension is greater than 4 [33]. Surface and obstacle absorption might be expected to have an enhanced effect with the onset of tangential and oblique room modes.…”

Section: Finite Element Model Of Room and Contents Absorptionmentioning

confidence: 99%

“…Although flanking transmission downgrades the insulation offered by a party wall/floor, for the low frequency modal region considered, its significant effect would be one of limiting maxima and minima in sound level difference. The effect of flanking can be considered as an additional damping due to vibration losses at the room surfaces [33]. Modally reactive surfaces [34] were included in the FEM model, which however was designed to incorporate locally reactive surfaces only.…”

Section: Room Damping Due To Surface Vibrationmentioning

confidence: 99%

Airborne Sound Level Difference between Dwellings at Low Frequencies

Gibbs

Maluski

2004

Building Acoustics

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This paper describes work on the relationship between laboratory measurements of the sound insulation of walls and floors, and the sound level difference between dwellings at frequencies below 200 Hz. The aim of the work was to describe the sound transmission between sound fields in small rooms and at low frequencies in terms of the modal characteristics of the spaces and of the intervening walls/floors. An experimentally validated finite element method (FEM) model was developed and a parametric survey conducted on the effects on sound level difference of construction, room/wall dimension and the absorption of surfaces and contents. The existing international standard ISO 140 gives a diffuse field correction to the sound reduction index, to give the level difference. This paper proposes a supplementary correction, which is a function of the low frequency characteristics of the separated rooms and of the walls/floors. In addition a statistical estimate is given of level difference for the range of likely conditions between dwellings for both heavyweight masonry walls and lightweight cavity walls.

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“…Methods requiring domain discretization such as the finite element method (FEM), the finite difference method, and the boundary element method (BEM), have not been widely used to compute the propagation of sound, because of the high computation cost entailed. The FEM [6] and the finite difference method [7] fail because the domain under consideration has to be fully discretized, and very fine meshes are needed to solve excitations at high frequencies. Methods like the BEM [8] are more efficient in terms of computer cost as they only require the discretization of the boundaries, but they involve a large computational effort, particularly for very high frequencies.…”

Section: Introductionmentioning

confidence: 99%

A three-dimensional acoustics model using the method of fundamental solutions

António

Tadeu

Godinho

2008

Engineering Analysis with Boundary Elements

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The method of fundamental solutions (MFS) is formulated in the frequency domain to model the sound wave propagation in threedimensional (3D) enclosed acoustic spaces. In this model the solution is obtained by approximation, using a linear combination of fundamental solutions for the 3D Helmholtz equation. Those solutions relate to a set of virtual sources placed over a surface placed outside the domain in order to avoid singularities. The materials coating the enclosed space surfaces can be assumed to be sound absorbent. This effect is introduced in the model by imposing impedance boundary conditions, with the impedance being defined as a function of the absorption coefficient. To impose these boundary conditions, a set of collocation points (observation points) needs to be selected along the boundary. Time domain responses are obtained by applying an inverse Fourier transform to the former frequency domain results. In order to avoid ''aliasing'' phenomena in the time domain results, the computations introduce damping in the imaginary part of the frequency. This effect is later removed in the time domain by rescaling the response. After corroborating the present solution against the analytical solution, known in closed form for the case of a parallelepiped room bounded by rigid walls, the model is used to solve the case of a dome.

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The effect of construction material, contents and room geometry on the sound field in dwellings at low frequencies

Cited by 18 publications

References 5 publications

Sound transmission between partitioned contiguous enclosures

Sound transmission between partitioned contiguous enclosures

Airborne Sound Level Difference between Dwellings at Low Frequencies

A three-dimensional acoustics model using the method of fundamental solutions

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