Measurement of sound absorption coefficient at low frequencies in reverberation chamber

Kód výsledku v 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>

Výsledek na webu

<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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Jazyk výsledku

angličtina

Název v původním jazyce

Measurement of sound absorption coefficient at low frequencies in reverberation chamber

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Measurement of sound absorption coefficient at low frequencies in reverberation chamber

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

BI - Akustika a kmity

OECD FORD obor

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Projekt

<a href="/cs/project/LO1607" target="_blank" >LO1607: RICE – Nové technologie a koncepce pro inteligentní průmyslové systémy</a><br>

Návaznosti

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

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název statě ve sborníku

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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Počet stran výsledku

5

Strana od-do

111-115

Název nakladatele

German Acoustical Society (DEGA)

Místo vydání

Berlin

Místo konání akce

Hamburg, Germany

Datum konání akce

21. 8. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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