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

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About: Sound reflection in an acoustic impedance tube terminated with a loudspeaker shunted by a negative impedance converter Goto Sponge NotDistinct Permalink

An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://iopscience.iop.org/0964-1726/21/11/115016/
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. 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. (en)
Title	Sound reflection in an acoustic impedance tube terminated with a loudspeaker shunted by a negative impedance converter Sound reflection in an acoustic impedance tube terminated with a loudspeaker shunted by a negative impedance converter (en)
skos:prefLabel	Sound reflection in an acoustic impedance tube terminated with a loudspeaker shunted by a negative impedance converter Sound reflection in an acoustic impedance tube terminated with a loudspeaker shunted by a negative impedance converter (en)
skos:notation	RIV/46747885:24220/12:#0002165!RIV13-GA0-24220___
http://linked.open...avai/riv/aktivita	P S Z
http://linked.open...avai/riv/aktivity	P(ED2.1.00/03.0079), P(GA101/08/1279), S, Z(AV0Z20430508)
http://linked.open...iv/cisloPeriodika	11
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Černík, Martin Mokrý, Pavel
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Technická univerzita v Liberci / Fakulta mechatroniky, informatiky a mezioborových studií
http://linked.open...dnocenehoVysledku	170054
http://linked.open...ai/riv/idVysledku	RIV/46747885:24220/12:#0002165
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	sound reflection; sound absorption; alectrodynamic loudspeaker; negative impedance converter (en)
http://linked.open.../riv/klicoveSlovo	negative impedance converter alectrodynamic loudspeaker sound absorption sound reflection
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[1770561E181F]
http://linked.open...i/riv/nazevZdroje	SMART MATERIALS AND STRUCTURES
http://linked.open...in/vavai/riv/obor	BI
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	2 (xsd:int)
http://linked.open...vavai/riv/projekt	Modern methods for noise and vibration suppression using piezoelectric materials Regional Center for Specialized Optical and Optoelektronic Systems
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	21
http://linked.open...iv/tvurceVysledku	Mokrý, Pavel Černík, Martin
http://linked.open...ain/vavai/riv/wos	000310547900020
http://linked.open...n/vavai/riv/zamer	Physical and chemical processes in plasmas and theis applications
issn	0964-1726
number of pages	9 (xsd:int)
http://bibframe.org/vocab/doi	10.1088/0964-1726/21/11/115016
http://localhost/t...ganizacniJednotka	24220

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