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Acoustic Admittance of Air-Driven Reed Generators

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Measurements are reported of the acoustic admittance of a damped metal reed, over a frequency range including the reed resonance, for a range of blowing pressures and for configurations in which the reed is either opened or closed by the blowing pressure. The measurements confirm the results of previous theoretical analysis (N. H. Fletcher, [1]). Each configuration shows a blowing pressure below which the conductance is always positive and no acoustic generation can take place. Above this pressure a reed that is blown open shows negative conductance in only a small frequency range just above the reed resonance and a reactance that is always inductive. A reed that is blown closed shows a negative conductance from zero frequency up to the resonance and a reactance that is always capacitive.

Zusammenfassung

Es wird über Messungen der akustischen Admittanz von gedämpften Metallzungen in einem Frequenzbereich, welcher die Zungenresonanz einschließt, berichtet, und zwar für Blasdrucke und Konfigurationen, bei denen die Zunge durch den Blasdruck entweder geöffnet oder geschlossen wird. Die Messungen bestätigen die Ergebnisse von früheren theoretischen Analysen (N. H. Fletcher, [1]). Jede Konfiguration besitzt einen Blasdruck unterhalb dessen die Kon-duktanz überall positiv ist und keine akustische Generation stattfinden kann. Oberhalb dieses Drucks besitzt eine Zunge, welche sich durch das Anblasen öffnet, negative Konduktanz innerhalb eines schmalen Frequenzbereichs unmittelbar oberhalb der Zungenresonanz und eine Reaktanz, welche überall induktiv ist. Eine Zunge, welche sich schließt, besitzt negative Konduktanz von der Frequenz Null bis zur Resonanzfrequenz und eine Reaktanz, welche überall kapazitiv ist.

Sommaire

On présente des mesures de l'admittance acoustique d'une anche métallique amortie effectuées sur une gamme de fréquences englobant la fréquence de résonance de l'anche et sur une étendue suffisante de pressions de soufflage, de manière à étudier des configurations dans lesquelles l'anche est soit ouverte soit fermée par la pression du souffle. Ces mesures confirment les prévisions d'une analyse théorique antérieure (N.H.Fletcher [1]). Chaque configuration fait apparaître une pression de souffle en dessous de laquelle la conductance est toujours positive et où aucune génération de son ne peut avoir lieu. Au dessus de cette pression, une anche qui est maintenue ouverte par le souffle présente une conductance négative seulement dans un étroit domaine de fréquences juste au-dessus de la résonance de l'anche, tandis que sa reactance est toujours inductive. Par contre, une anche qui est maintenue fermée par le souffle manifeste une conductance négative depuis la fréquence nulle jusqu'au dessus de la résonance et une reactance qui est toujours capacitive.
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Document Type: Research Article

Publication date: February 1, 1982

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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