Application of a finite-element model to low-frequency sound insulation in dwellings

Maluski, Sophie; Gibbs, B.M.

doi:10.1121/1.1310355

Cited by 61 publications

(59 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The comparison of the results with experimental data [12] showed that the sound insulation is strongly dependent on the modal characteristics of the sound field within the adjacent rooms, at low frequencies.…”

Section: Introductionmentioning

confidence: 92%

“…The FEM has been applied to analyze the effect of room dimension on the sound insulation of a separating panel at low frequencies [11,12]. The comparison of the results with experimental data [12] showed that the sound insulation is strongly dependent on the modal characteristics of the sound field within the adjacent rooms, at low frequencies.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analytical evaluation of the acoustic insulation provided by double infinite walls

António

Tadeu

Godinho

2003

Journal of Sound and Vibration

View full text Add to dashboard Cite

The acoustic insulation provided by infinite double panel walls, when subjected to spatially sinusoidal line pressure loads, is computed analytically. The methodology used extends earlier work by the authors on the definition of the acoustic insulation conferred by a single panel wall. It does not entail any simplification other than the assumption that the panels are of infinite extent. The full interaction between the fluid (air) and the solid layers is thus taken into account and the calculation does not involve limiting the thickness of any layer, as the Kirchhoff or Mindlin theories require. The problem is first formulated in the frequency domain. Time domain solutions are then obtained by means of inverse Fourier transforms using complex frequencies.The model is first used to compute the sound reduction provided by a double homogeneous brick wall, with identical panels, when illuminated by plane sound waves. The results are then compared with those provided by the simplified method proposed by London, which was later extended by Beranek (LondonBeranek method). The limitations of the simplified London-Beranek model, namely, its applicability only to double walls with identical mass, subjected to plane waves, and its failure to account for the coincidence effect, are overcome by the method proposed.Time signatures are produced to illustrate the different sound transmission mechanisms. Several types of body and guided waves are originated, giving rise to a complex dynamic system with multiple reflections within the solid and fluid layers and the global resonance of the system. The effect of the cavity absorption is considered by attributing a complex density to the air filling the space between the two wall panels. Absorption attenuates the dips of insulation controlled by the cavity resonances. Several simulations are then performed for different combinations of wall and air layer thickness to assess the influence of this variable on the final acoustic insulation. The influence of the air cavity on sound reduction was found to be dependent on the frequency. At low frequencies a better performance was achieved for thicker air layers, while at higher frequencies a thinner air layer is preferable. The use of wall panels with different mass resulted in the wall performing better, particularly for high frequencies. 0022-460X/03/$ -see front matter r

show abstract

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Analytical evaluation of the acoustic insulation provided by double infinite walls

António

Tadeu

Godinho

2003

Journal of Sound and Vibration

View full text Add to dashboard Cite

show abstract

“…occurs around 61 Hz, being shifted by approximately 4 Hz above the frequency estimated by Eq. (15). By contrast, if a decoupled analysis is performed, the dynamic behaviour of each individual room is maintained, and thus the frequency position of the SPL reduction dips coincides with the predicted values.…”

Section: Coupling Effect Between Roomsmentioning

confidence: 99%

3D Multi-Domain MFS Analysis of Sound Pressure Level Reduction Between Connected Enclosures

Godinho¹,

Branco²,

Amado-Mendes³

2011

Archives of Acoustics

View full text Add to dashboard Cite

In this paper, the authors study the 3D propagation of sound waves between two closed spaces. The separation element between the two rooms is considered to include either a small opening or a homogeneous lightweight panel, coupling the two spaces. A numerical study of this configuration is performed, trying to understand the influence of the position and geometry of this opening in the sound pressure level reduction curve at low and midfrequencies. Additionally, the coupling effect between the two acoustic spaces is analyzed, in order to better understand its importance when determining the sound pressure level reduction. Different boundary conditions are ascribed to the walls of these rooms, simulating both the completely reflecting and partially absorbing surfaces.The numerical modelling was performed using a multi-domain formulation of the Method of Fundamental Solutions (MFS). The system is composed of two coupled rooms, limited by rigid or by absorbing walls, and separated by a thin wall (tending to null thickness) with a small opening. An experimental validation of the proposed model is presented, comparing its results with those found experimentally for a reduced-scale model. It is important to note that, for such a configuration, a traditional single-domain approach using methods like the MFS or the BEM would lead to undetermined equation systems, and thus the proposed model makes use of a domain decomposition technique.

show abstract

“…Therefore, the sound pressures are different on each side of the shell. However, it has been described by some researchers (Maluski and Gibbs, 2000;Nguyen, 2001) that each node in the shell element will have the same pressure on each side of the shell and using shell elements with air media and structure interfaces on both sides will lead to some mistakes.…”

Section: Tire/pavement Acoustic Modelingmentioning

confidence: 99%

An Experimental and Numerical Study of Tire/Pavement Noise on Porous and Nonporous Pavements

Dai

Lou²

2008

J ENV INFORM

View full text Add to dashboard Cite

ABSTRACT. This present research assesses tire/pavement noise by analyzing and comparing noise data acquired from low noise pavement (Asphalt Rubber Concrete) and conventional pavement (Asphalt Concrete). Close Proximity (CPX) tests are employed in this research to acquire the tire/pavement noise generated from the test pavements. A numerical simulation model established via the finite element method is conducted to simulate the noise generated by the impact mechanism, which is observed from the CPX test on both the test pavements. The simulated tire/pavement noise pressure levels are compared with those tested to verify the reliability of the numerical model.

show abstract

Application of a finite-element model to low-frequency sound insulation in dwellings

Cited by 61 publications

References 17 publications

Analytical evaluation of the acoustic insulation provided by double infinite walls

Analytical evaluation of the acoustic insulation provided by double infinite walls

3D Multi-Domain MFS Analysis of Sound Pressure Level Reduction Between Connected Enclosures

An Experimental and Numerical Study of Tire/Pavement Noise on Porous and Nonporous Pavements

Contact Info

Product

Resources

About