General analytical approach for sound transmission loss analysis through a thick metamaterial plate

2014 ◽  
Vol 116 (19) ◽  
pp. 193509 ◽  
Author(s):  
Mourad Oudich ◽  
Xiaoming Zhou ◽  
M. Badreddine Assouar
Keyword(s):  
Analytical Approach ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Sound Transmission Loss ◽  
Loss Analysis

scholarly journals Sound Transmission Loss Analysis for Laminated Glass and Perspex

2018 ◽  
Vol 429 ◽  
pp. 012008
Author(s):  
W. H. Tan ◽  
E. A. Lim ◽  
E. M. Cheng ◽  
K. S. Basaruddin ◽  
M. Hafifi Ramli
Keyword(s):  
Transmission Loss ◽  
Sound Transmission ◽  
Laminated Glass ◽  
Sound Transmission Loss ◽  
Loss Analysis

scholarly journals Sound Transmission Loss Analysis on Building Materials

2018 ◽  
Vol 15 (4) ◽  
pp. 6001-6011 ◽  
Author(s):  
Tan Wei Hong ◽  
C. F. Sin
Keyword(s):  
Building Materials ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Expanded Polystyrene ◽  
Sound Insulation ◽  
Insulation Material ◽  
Sound Transmission Loss ◽  
Loss Analysis ◽  
Aerated Concrete ◽  
Selection Of

This study is mainly to determine the sound transmission loss (STL) performance of the four selected building materials using the impedance tube. The four building materials are; autoclaved aerated concrete (AAC), laminated glass, expanded polystyrene and rockwool. Transmission loss occurs when a sound goes through a partition or barrier. The specimens are prepared in two thicknesses, which are 10 mm and 20 mm. The STL of the specimen was determined and analysed. It is observed that the STL results for all the tested materials are having a similar trend, which is a thicker specimen gives higher STL. In general, all the materials deliver high STL at the frequency range of 3000 – 5500 Hz. In overall, the result shows that the expanded polystyrene scores the highest STL among the four building materials in this study. Six combinations of different material also were tested, and AAC & expanded polystyrene combination shows the highest STL value among the six combinations. The outcomes of this study can be referred by noise control engineer on the selection of the sound insulation material for the building noise insulation treatment.

Vibro-acoustic and sound transmission loss analysis of truncated conical shell subjected to incident sound wave

2018 ◽  
Vol 25 (2) ◽  
pp. 435-444 ◽  
Author(s):  
Afshin Tebyanian ◽  
Mohammad Reza Ghazavi
Keyword(s):  
Acoustic Pressure ◽  
Transmission Loss ◽  
Outer Space ◽  
Sound Transmission ◽  
Acoustic Energy ◽  
Sound Transmission Loss ◽  
Loss Analysis ◽  
The Media ◽  
Shell Vibration ◽  
Element Method

A combination of analytical method for shell vibration, boundary element method (BEM) for acoustic media of shell outer space, and finite element method (FEM) for shell inner space was used to study the vibro-acoustic behavior and extract sound transmission loss factor (STL) of a coupled vibro-acoustic system. The equation of motion of the shell is extracted based on the Donnell–Mushtari hypothesis and using Hamilton principles. The acoustic pressure on the outer and inner space is obtained using BEM on the defined nodes on the surface and these localized nodal pressures are converted to nodal concentrated forces. Finally, vibration of the coupled vibro-acoustic model is solved in frequency domain and vibration response of shell and acoustic pressure at any point in the media (outer, on the surface, and inner of shell) are obtained. Also, the STL of the shell is extracted based on the ratio of total acoustic energy received by the shell to that transferred to inner space.

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