Results 271 to 280 of about 7,658,431 (298)

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
openaire   +2 more sources

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
openaire   +2 more sources

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
openaire   +1 more source

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
openaire   +2 more sources

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 ...
openaire   +1 more source

Comparison between Sound Reduction Index Measurement Techniques

2002
The Sound Reduction Index of a partition can be measured according to the method described by ISO 140-3. This measurement technique does not make it possible to discern between direct transmission through the partition and transmission through the lateral structures of the rooms.
P. FAUSTI, SECCHI, SIMONE
openaire   +2 more sources

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

Building Acoustics, 2006
Generally sound reduction index R is measured for an incident diffuse field, and does not take into account the angular dependency. However, the variation of reduction index with direction of incoming wave can be significant, and it may be necessary to consider the angular influence in acoustical transmission problems, especially when considering ...
Claire Brutel-Vuilmet, Catherine Guigou-Carter, Michel Villot, Philippe Jean   +3 more
openaire   +1 more source

Separation of Resonant and Non-Resonant Components—Part I: Sound Reduction Index

Building Acoustics, 2008
There is much interest in applying EN12354-1 to lightweight buildings elements which may have critical frequencies above the frequency range of interest. The standard requires that only the resonant component of the sound reduction index be used in the predictions and therefore a reliable method of calculating the resonant component is needed for these
Jeffrey Mahn, John Pearse
openaire   +1 more source

The drying process influence on the brick walls sound reduction index: laboratory evaluations and theoretical analysis

The Journal of the Acoustical Society of America, 2008
This paper presents experimental results showing the sound reduction index of different types of brick walls; the analysis was in particular carried out on double walls, single walls, and single walls with external lining. Its main purpose is to find the minimum drying time of the structure necessary to obtain the sound reduction indexes of brick walls
Scrosati C, Scamoni F, Valentini F
openaire   +3 more sources

Analysis of the extensibility of Sound Reduction Index measurements of windows

2013
Atti dei convegni congiunti dell'associazione italiana di acustica e dell'associazione tedesca di ...
SECCHI, SIMONE, NANNIPIERI, ELISA, E. Stoppioni   +2 more
openaire   +1 more source