Qualitative behaviour of L1 and L2 standard deviation in insulations measurements according to standard UNE EN ISO 140-4

Navacerrada Saturio, María de los Ángeles and Díaz Sanchidrián, César and Pedrero González, Antonio (2011). Qualitative behaviour of L1 and L2 standard deviation in insulations measurements according to standard UNE EN ISO 140-4. In: "Forum Acusticum 2011", 26/06/2011 - 01/07/2011, Aalborg, Dinamarca. pp. 2605-2610.

Description

Title: Qualitative behaviour of L1 and L2 standard deviation in insulations measurements according to standard UNE EN ISO 140-4
Author/s:
  • Navacerrada Saturio, María de los Ángeles
  • Díaz Sanchidrián, César
  • Pedrero González, Antonio
Item Type: Presentation at Congress or Conference (Article)
Event Title: Forum Acusticum 2011
Event Dates: 26/06/2011 - 01/07/2011
Event Location: Aalborg, Dinamarca
Title of Book: Proceedings of Forum Acusticum 2011
Date: 2011
Subjects:
Faculty: E.T.S. Arquitectura (UPM)
Department: Física e Instalaciones Aplicadas a la Edificación, al Medio Ambiente y al Urbanismo [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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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

More information

Item ID: 12830
DC Identifier: http://oa.upm.es/12830/
OAI Identifier: oai:oa.upm.es:12830
Official URL: http://www.fa2011.org/
Deposited by: Memoria Investigacion
Deposited on: 13 Nov 2012 11:06
Last Modified: 20 May 2020 09:32
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