Results 221 to 230 of about 71,665 (253)

Measurement and simulation of brick wall sound reduction index

The Journal of the Acoustical Society of America, 2002
This paper presents the procedures and results of an experimental, numerical simulation and analytical model of sound reduction index of solid brick wall. The solid brick used has the following dimensions: 22×10×5 cm and density of 1850 kg/m3. The physic-mechanical characteristics: density, resistance, and elasticity modulus were measured using a set ...
Dinara X. da Paixao, Elias B. Teodoro, Samir N. Y. Gerges   +2 more
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Technical Note: Influence of the Frame on the Sound Reduction Index of a Window

Building Acoustics, 2000
The Sound Reduction Index of 1.2 × 1.2 m windows composed of two identical pivoting leaves of three different thickness of laminated glass and inserted in two different frames (aluminium and PVC) had been measured using pressure and sound intensity techniques. The Sound Reduction Index has been also predicted.
Francisco Cervera, Antonio Uris
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Predicting the sound reduction index of laminated glass

Applied Acoustics, 1994
Abstract Vibration tests on small samples have been used to obtain the critical frequencies and loss factors of 7 mm, 9 mm and 11 mm laminated glass. The Sound Reduction Index (SRI) as a function of frequency has then been predicted using Sharp's method.
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On the measurement of the radiation efficiency for the estimate of the resonant sound reduction index

The Journal of the Acoustical Society of America, 2017
The estimate of the resonant sound reduction index has received attention over the years as the prediction method described in the standard, ISO 15712 has been applied to lightweight building constructions. A method of estimating the resonant sound reduction index involves the measurement of the total and the resonant radiation efficiencies of the ...
Jeffrey Mahn, Christoph Höller
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Modelling of impervious layers from measurements of the sound reduction index

Applied Acoustics, 2003
Abstract In this work, developed algorithms are described to characterise impervious layers. It also includes measurements for their sound reduction indexes. These algorithms are based on the minimisation of the quadratic error and allow determining the parameters that characterise the impervious layer.
Jesus Alba, Jaime Ramis
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Some notes on the sound reduction index of pax cabins panels on cruise ships

The Journal of the Acoustical Society of America, 2008
The issue of comfort of passenger ships has became in the last years of paramount importance; in this context the noise and vibration control plays a leading role. The concept of comfort on board is subjective and it is impossible to define it with simple formula.
BIOT, MARCO, F. DE LORENZO
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Enhancing maximum measurable sound reduction index using sound intensity method and strong receiving room absorption

The Journal of the Acoustical Society of America, 2001
The sound intensity method is usually recommended instead of the pressure method in the presence of strong flanking transmission. Especially when small and/or heavy specimens are tested, the flanking often causes problems in laboratories practicing only the pressure method.
V, Hongisto, M, Lindgren, J, Keränen
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Case study: Evaluation of noise reduction in frequencies and sound reduction index of construction with variable noise isolation

Noise Control Engineering Journal, 2020
Intense sound levels produced by engineering equipment have become an acute issue. As most of engineering equipment require air supply, exhaust and good ventilation, it is not possible to control the noise by covering them with tight hoods. Louver with blades covered with acoustic materials and gaps that enable free circu- lation of air are used to ...
Tomas VilniÅ¡kis, Tomas JanuÅ¡eviÄ?ius, Pranas BaltrÄ—nas   +2 more
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Vibration Velocity Technique for Sound Reduction Index Measurement

2003
The Apparent Sound Reduction Index of a partition can be measured according to the method described by ISO 140-4. In many real situations, alternative methods, like the intensity based method and the vibration velocity based method, could be useful.
SECCHI, SIMONE, P. FAUSTI, M. GUALANDI
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Rating the impact sound insulation of flooring from its airborne sound reduction index

The Journal of the Acoustical Society of America, 2012
With the increasing adoption of higher density forms of dwellings in urban environments we need reliable but economic means of verifying that they meet specified sound insulation requirements. This is particularly so now that territorial and building code authorities are realising that performance checking is an indispensible part of the quality ...
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