Measurement of sound absorption coefficient at low frequencies in reverberation chamber

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23220%2F16%3A43929073" target="_blank" >RIV/49777513:23220/16:43929073 - isvavai.cz</a>

Result on the web

<a href="http://pub.dega-akustik.de/IN2016/data/articles/000739.pdf" target="_blank" >http://pub.dega-akustik.de/IN2016/data/articles/000739.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Measurement of sound absorption coefficient at low frequencies in reverberation chamber

Original language description

Acoustic features of materials are commonly evaluated in the frequency range 100 Hz - 5 kHz. This frequency range is not sufficient in these days, especially at low frequencies. There are two measuring methods how to measure sound absorption coefficient at low frequencies in a reverberation chamber. Both of these methods are based on measurement of sound pressure level decay. The first measuring method directly uses of modal properties of a room and the decay curve is determined for each natural frequency separately. The second measuring method is based on measurement in accordance with ISO 354 standard. The frequency response of the reverberation room is adjusted by pecifically placed a sound absorbing material, which damping isolated natural frequencies of the reverberation chamber.The article will discuss the possibility of combining both of the above-mentioned measuring methods into one. This measuring method will not require additional acoustic treatment and will be based on measurement in accordance with ISO 354 standard. Measuring points will be selected with respect to modal properties of the room and damping of natural frequencies at low frequencies will be realized by the excitation signal. The signal is chosenthat there is a minimal excitation of these natural frequencies.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

BI - Acoustics and oscillation

OECD FORD branch

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Project

<a href="/en/project/LO1607" target="_blank" >LO1607: RICE - New technologies and concepts for smart industrial system</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proceedings of the INTER-NOISE 2016 : 45th International Congress and Exposition on Noise Control Engineering : Towards a Quieter Future

ISBN

978-3-939296-11-9

ISSN

0105-175X

e-ISSN

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Number of pages

5

Pages from-to

111-115

Publisher name

German Acoustical Society (DEGA)

Place of publication

Berlin

Event location

Hamburg, Germany

Event date

Aug 21, 2016

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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