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

Result code in 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>

Alternative codes found

RIV/46747885:24220/12:#0002165

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BI - Acoustics and oscillation

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2012

Confidentiality

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

Name of the periodical

Smart Materials & Structures

ISSN

0964-1726

e-ISSN

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Volume of the periodical

21

Issue of the periodical within the volume

11

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

115016-115016

UT code for WoS article

000310547900020

EID of the result in the Scopus database

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