Skip to main content

LUP Student Papers

LUND UNIVERSITY LIBRARIES

Investigation of the Influence of Incident Angle and Frequency Dependence of a Ceiling Absorber on Room Acoustic Descriptors

Bjarnadottir, Arnheidur (2013) In TVBA-5000 VTA820 20131
Engineering Acoustics
Department of Construction Sciences
Abstract
The aim of this thesis is to investigate the following:

− The influence of incident angle and frequency dependency of a ceiling absorber on room acoustic descriptors
− How ceiling absorber properties influence room acoustic descriptors such as reverberation time and steady state sound pressure level
− Whether steady state sound pressure level is more related to the statistical absorption coefficient (the average of all incidents) than the reverberation time in a room with an absorbent ceiling
− The scattering effect due to furniture in a school classroom

The software package WinFlag was used to simulate acoustics in a typical school classroom. The absorption coefficient was computed for several different angles, frequencies and... (More)
The aim of this thesis is to investigate the following:

− The influence of incident angle and frequency dependency of a ceiling absorber on room acoustic descriptors
− How ceiling absorber properties influence room acoustic descriptors such as reverberation time and steady state sound pressure level
− Whether steady state sound pressure level is more related to the statistical absorption coefficient (the average of all incidents) than the reverberation time in a room with an absorbent ceiling
− The scattering effect due to furniture in a school classroom

The software package WinFlag was used to simulate acoustics in a typical school classroom. The absorption coefficient was computed for several different angles, frequencies and ceiling absorbers. The WinFlag results were compared with results obtained by measuring reverberation time and sound pressure level in a 1:3 scale model of the classroom.

The conclusion was that it is not enough to use reverberation time to investigate the quality of the ceiling. It is important to use more acoustic parameters to do this like for example sound pressure level, and it is also important to evaluate sound pressure level and reverberation time separately. (Less)
Popular Abstract
This thesis is about how ceiling absorbers can help with acoustical design in classrooms.
The study shows that knowing the reverberation time is not enough when designing a good studying environment. More parameters must be used, for instance the sound pressure level.
Please use this url to cite or link to this publication:
author
Bjarnadottir, Arnheidur
supervisor
organization
course
VTA820 20131
year
type
H3 - Professional qualifications (4 Years - )
subject
publication/series
TVBA-5000
report number
TVBA-5041
ISSN
0281-8477
language
English
id
8888972
alternative location
http://www.akustik.lth.se/publikationer/tvba-5000-examensarbeten/
date added to LUP
2016-08-23 09:18:33
date last changed
2016-08-30 14:21:16
@misc{8888972,
  abstract     = {The aim of this thesis is to investigate the following:

− The influence of incident angle and frequency dependency of a ceiling absorber on room acoustic descriptors
− How ceiling absorber properties influence room acoustic descriptors such as reverberation time and steady state sound pressure level
− Whether steady state sound pressure level is more related to the statistical absorption coefficient (the average of all incidents) than the reverberation time in a room with an absorbent ceiling
− The scattering effect due to furniture in a school classroom

The software package WinFlag was used to simulate acoustics in a typical school classroom. The absorption coefficient was computed for several different angles, frequencies and ceiling absorbers. The WinFlag results were compared with results obtained by measuring reverberation time and sound pressure level in a 1:3 scale model of the classroom.

The conclusion was that it is not enough to use reverberation time to investigate the quality of the ceiling. It is important to use more acoustic parameters to do this like for example sound pressure level, and it is also important to evaluate sound pressure level and reverberation time separately.},
  author       = {Bjarnadottir, Arnheidur},
  issn         = {0281-8477},
  language     = {eng},
  note         = {Student Paper},
  series       = {TVBA-5000},
  title        = {Investigation of the Influence of Incident Angle and Frequency Dependence of a Ceiling Absorber on Room Acoustic Descriptors},
  year         = {2013},
}