On the measurement of the radiation efficiency for the estimate of the resonant sound reduction index

2017 ◽  
Vol 141 (5) ◽  
pp. 3478-3478
Author(s):  
Jeffrey Mahn ◽  
Christoph Höller
Keyword(s):  
Radiation Efficiency ◽  
Sound Reduction ◽  
Reduction Index

Prediction of sound reduction index of plenum window by the surface impedance approach

2021 ◽  
Vol 175 ◽  
pp. 107851
Author(s):  
Liangfen Du ◽  
Siu-Kit Lau ◽  
Siew Eang Lee
Keyword(s):  
Surface Impedance ◽  
Sound Reduction ◽  
Reduction Index

Measurement of the Sound Reduction Index as a Function of the Incidence Angle by Two Different Methods

2006 ◽  
Vol 13 (1) ◽  
pp. 33-48 ◽  
Author(s):  
Claire Brutel-Vuilmet ◽  
Catherine Guigou-Carter ◽  
Michel Villot ◽  
Philippe Jean
Keyword(s):  
Incidence Angle ◽  
Sound Reduction ◽  
Reduction Index

A modal approach to the prediction of the sound reduction index

2003 ◽  
Vol 113 (4) ◽  
pp. 2187-2187
Author(s):  
Alain Tisseyre ◽  
Cécile Courné ◽  
Thomas Buzzy ◽  
André Moulinier
Keyword(s):  
Modal Approach ◽  
Sound Reduction ◽  
Reduction Index

Prediction of the sound reduction index with the modal theory

2004 ◽  
Vol 115 (5) ◽  
pp. 2537-2537
Author(s):  
Alain Tisseyre ◽  
Cecile Courne ◽  
Andre Moulinier ◽  
Thomas Buzzi
Keyword(s):  
Modal Theory ◽  
Sound Reduction ◽  
Reduction Index

Research on the Prediction of Impact Sound Insulation to a Homogeneous Wall

2015 ◽  
Vol 744-746 ◽  
pp. 1593-1596
Author(s):  
Shang You Wei ◽  
Xian Feng Huang ◽  
Zhi Xiang Zhuang ◽  
Jun Xin Lan
Keyword(s):  
Energy Analysis ◽  
Sound Transmission ◽  
Sound Insulation ◽  
Statistical Energy Analysis ◽  
Analysis Framework ◽  
Mechanism Of Impact ◽  
Sound Reduction ◽  
The Impact ◽  
Insulating Properties ◽  
Reduction Index

In this paper, a theoretical model to evaluate impact sound transmission through a homogeneous wall is proposed. The model which is based on the Statistical Energy Analysis framework exhibits a system with room-wall-room. For the purpose to explore the mechanism of impact sound transmission through a wall, the impact sound reduction index between two rooms are predicted. Meanwhile, the variation of impact sound reduction index with the walls properties are also taken into account. The results reveal that the density, elastic modulus and thickness of a homogeneous wall have diverse effects on its impact sound insulation and can be chosen adequately to achieve ideal insulation values.It provides an approach to optimize impact sound insulating properties of the walls.

Slits' Effects on Sound Insulation for Lightweight Partitions

2014 ◽  
Vol 507 ◽  
pp. 153-156
Author(s):  
Xian Feng Huang ◽  
Quan Shi ◽  
Chen Hui Zhu
Keyword(s):  
Sound Insulation ◽  
High Frequencies ◽  
Rectangular Aperture ◽  
Index Variation ◽  
Sound Reduction ◽  
Reduction Index

The slits on the lightweight partitions have a significant effect on sound insulation which is investigated in this paper. According to Gomperts model for rectangular aperture, the sound reduction index of a wall with slits can be predicted. Two lightweight partitions were selected to analyze their sound reduction index variation with factors such as width, length and location of slits. Results show that these factors affect the sound insulation evidently, especially at high frequencies.

Vibration Reduction Index of a T-Junction With a Flexible Interlayer

2012 ◽  
Vol 134 (2) ◽  
Author(s):  
J. Alba ◽  
E. Escuder ◽  
J. Ramis ◽  
R. Del Rey ◽  
E.G. Segovia
Keyword(s):  
Near Field ◽  
Vibration Reduction ◽  
Scale Model ◽  
Reliable Prediction ◽  
The Cost ◽  
Elastic Layers ◽  
Sound Reduction ◽  
Predictive Formulas ◽  
Expression Of Uncertainty ◽  
Reduction Index

This paper describes the procedure followed to evaluate the vibration reduction index for T-junctions with inserted flexible elements and proposes new equations to complement the standard EN 12354-1:2000. The experiment described in this work is based on a 1:3 scale model of a T-junction with a flexible interlayer. It was used to obtain a significant reduction in the cost of the configurations under study. We chose to carry out vibration measurements by near-field acoustic holography (NAH) in order to avoid the risk of accelerometer interference. Flanking transmission was determined for different elastic layers with the objective of quantifying the effect of the flexible interlayer and to compare the results obtained with predictive formulas. The results enabled us to propose new equations to complement EN 12354-1:2000 for the reliable prediction of the apparent sound reduction index. The uncertainty associated with the different average velocity levels is determined according to the Guide for the Expression of Uncertainty of Measurement (GUM).

Sound Insulation Determination of Door

2014 ◽  
Vol 1057 ◽  
pp. 215-222 ◽  
Author(s):  
Dušan Dlhý ◽  
Peter Tomašovič
Keyword(s):  
Structural Complexity ◽  
Point Of View ◽  
Sound Insulation ◽  
Laboratory Measurements ◽  
Door Frame ◽  
Small Change ◽  
Sound Reduction ◽  
Reduction Index

The structural complexity of a door causes difficulties in the description of its behavior from an acoustical point of view. In many cases, even a small change can cause a big difference in its sound-isolating properties. To determine the acoustical quality of a door, it is important to perform laboratory measurements of the door structure and door frame, the gaps including. A mathematical analysis based on experimental measurements of the sound reduction index of several door constructions was used to determine the acoustical door categories. The equations for calculating the sound reduction index, which were introduced in this paper, should help in the design of a suitable door from an acoustical point of view.

The effective sound reduction index of a panel subjected to non-diffuse excitation in a disproportionate room

1994 ◽  
Vol 41 (3) ◽  
pp. 203-228
Author(s):  
M.A. Rowell ◽  
D.J. Oldham ◽  
R.J. Orlowski
Keyword(s):  
Sound Reduction ◽  
Reduction Index
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