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Memorias de investigación
Communications at congresses:
Qualitative behaviour of L1 and L2 standard deviation in insulations measurements according to standard UNE EN ISO 140-4
Year:2011
Research Areas
  • Civil engineering and architecture
Information
Abstract
Knowledge of the uncertainty of measurement of testing results is important when results have to be compared with limits and specifications. In the measurement of sound insulation following standards UNE EN ISO 140-4 the uncertainty of the final magnitude is mainly associated to the average sound pressure levels L1 and L2 measured. A parameter that allows us to quantify the spatial variation of the sound pressure level is the standard deviation of the pressure levels measured at different points of the room. In this work, for a wide number of measurements following standards UNE EN ISO 140-4 we analyzed qualitatively the behaviour of the standard deviation for L1 and L2. The study of sound fields in enclosed spaces is very difficult. There are a wide variety of rooms with different sound fields depending on factors as volume, geometry and materials. In general, we observe that the L1 and L2 standard deviations contain peaks and dips independent on characteristics of the rooms at single frequencies that could correspond to critical frequencies of walls, floors and windows or even to temporal alterations of the sound field. Also, in most measurements according to UNE EN ISO 140-4 a large similitude between L1 and L2 standard deviation is found. We believe that such result points to a coupled system between source and receiving rooms, mainly at low frequencies the shape of the L1 and L2 standard deviations is comparable to the velocity level standard deviation on a wall.
International
Si
Congress
Forum Acusticum 2011
960
Place
Aalborg - Dinamarca
Reviewers
Si
ISBN/ISSN
978-84-694-1520-7
Start Date
26/06/2011
End Date
01/07/2011
From page
2605
To page
2610
Proceedings
Participants
  • Autor: M. de los Angeles Navacerrada Saturio (UPM)
  • Autor: Julian Cesar Diaz Sanchidrian (UPM)
  • Autor: Antonio Pedrero Gonzalez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Acústica Arquitectónica
  • Departamento: Ingeniería Audiovisual y Comunicaciones
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