Memorias de investigación
Ponencias en congresos:
Qualitative behaviour of L1 and L2 standard deviation in insulations measurements according to standard UNE EN ISO 140-4
Año:2011
Áreas de investigación
  • Ingeniería civil y arquitectura
Datos
Descripción
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.
Internacional
Si
Nombre congreso
Forum Acusticum 2011
Tipo de participación
960
Lugar del congreso
Aalborg - Dinamarca
Revisores
Si
ISBN o ISSN
978-84-694-1520-7
DOI
Fecha inicio congreso
26/06/2011
Fecha fin congreso
01/07/2011
Desde la página
2605
Hasta la página
2610
Título de las actas
Proceedings
Esta actividad pertenece a memorias de investigación
Participantes
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Acústica Arquitectónica
  • Departamento: Ingeniería Audiovisual y Comunicaciones