Sound reflection in an acoustic impedance tube terminated with a loudspeaker shunted by a negative impedance converter

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F12%3A00382830" target="_blank" >RIV/61389021:_____/12:00382830 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/46747885:24220/12:#0002165

Výsledek na webu

<a href="http://dx.doi.org/10.1088/0964-1726/21/11/115016" target="_blank" >http://dx.doi.org/10.1088/0964-1726/21/11/115016</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/0964-1726/21/11/115016" target="_blank" >10.1088/0964-1726/21/11/115016</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Sound reflection in an acoustic impedance tube terminated with a loudspeaker shunted by a negative impedance converter

Popis výsledku v původním jazyce

A system for the absorption of sound at the termination of an acoustic tube using an electrodynamic loudspeaker connected to a shunt circuit is presented. A theoretical model of the electrodynamic loudspeaker in the acoustic tube is used for the calculation of the frequency dependence of the ideal shunt circuit impedance, which yields perfect sound absorption in broad frequency range. It is shown that both the real and imaginary parts of the shunt circuit impedance must be negative in the considered system. The required negative values of the shunt circuit impedance are achieved using a negative impedance converter. Frequency dependences of the reflection coefficient were measured in the acoustic impedance tube using the two-microphone transfer function method. Greatly reduced values of sound absorption coefficient were achieved in a narrow frequency range. The stability, applicability of the sound absorption system, and broadening its frequency range are discussed.

Název v anglickém jazyce

Sound reflection in an acoustic impedance tube terminated with a loudspeaker shunted by a negative impedance converter

Popis výsledku anglicky

A system for the absorption of sound at the termination of an acoustic tube using an electrodynamic loudspeaker connected to a shunt circuit is presented. A theoretical model of the electrodynamic loudspeaker in the acoustic tube is used for the calculation of the frequency dependence of the ideal shunt circuit impedance, which yields perfect sound absorption in broad frequency range. It is shown that both the real and imaginary parts of the shunt circuit impedance must be negative in the considered system. The required negative values of the shunt circuit impedance are achieved using a negative impedance converter. Frequency dependences of the reflection coefficient were measured in the acoustic impedance tube using the two-microphone transfer function method. Greatly reduced values of sound absorption coefficient were achieved in a narrow frequency range. The stability, applicability of the sound absorption system, and broadening its frequency range are discussed.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BI - Akustika a kmity

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2012

Kód důvěrnosti údajů

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

Název periodika

Smart Materials & Structures

ISSN

0964-1726

e-ISSN

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Svazek periodika

21

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

115016-115016

Kód UT WoS článku

000310547900020

EID výsledku v databázi Scopus

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