Technical Note: Influence of the Frame on the Sound Reduction Index of a Window

2000 ◽  
Vol 7 (4) ◽  
pp. 315-323
Author(s):  
Francisco Cervera ◽  
Antonio Uris
Keyword(s):  
Technical Note ◽  
Sound Reduction ◽  
Reduction Index

Technical Note: Determination of Impact Noise of Floors Based on Vibration Measurements

2007 ◽  
Vol 14 (3) ◽  
pp. 223-229
Author(s):  
Simone Secchi ◽  
Gianfranco Cellai
Keyword(s):  
Field Measurement ◽  
Technical Note ◽  
Vibration Velocity ◽  
Vibration Measurements ◽  
Impact Noise ◽  
New Type ◽  
Sound Reduction ◽  
Velocity Level ◽  
Reduction Index

Field measurement of acoustical performances of buildings is difficult where construction has not been completed. The absence of doors, windows and other finishing details, generates sound transmission paths, which can modify the results of measurements. In these cases, acoustical performances of building, such as sound reduction index and impact noise, can be determined through the temporary close of all openings, or through the measurement of the vibration velocity level of the partitions examined. Both techniques allow the elimination of airborne transmission paths, while the second also permits the evaluation of the contribution of structural flanking transmission. In this paper, a technique is described for the estimation of impact noise of floors from measurements of velocity levels. Results are presented for a concrete floors and a comparison given between the traditional and new type of measurements.

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).

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