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Resonant frequency shifts induced by a large spherical object in an air-filled acoustic cavity
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FIG. 1.

Experimental setup. (1) Electromechanical vibrator, (2) quasi-one-dimensional square section cavity, (3) microphone, and (4) accelerometer. A metallic magnetic sphere is placed inside and held fixed by another magnetic sphere from outside. The origin is chosen at the wall close to the vibrator.

Image of FIG. 2.

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FIG. 2.

Normalized resonant frequencies vs for the first five longitudinal modes (a) , (b) , (c) , (d) , and (e) : Experiments (엯), Leung’s prediction (dashed line), and solution of the variable cross-section model (continuous line). Both theoretical predictions are computed using .

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TABLE I.
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/content/asa/journal/jasa/121/6/10.1121/1.2739110
2007-05-16
2014-04-17

Abstract

Acoustic resonances are modified when objects are introduced into a chamber. The magnitude of these changes depends on the object position, size, and shape, as well as on its acoustic properties. Here, an experimental study concerning the resonant frequency shifts induced by a solid spherical object in a quasi-one-dimensional air-filled acoustic cavity is reported. It is shown that Leung’s theory does not account quantitatively for the observations. A novel and simple approach is proposed, based on the wave equation in a cavity of variable cross section. The results fit more accurately the measured frequency shifts.

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Scitation: Resonant frequency shifts induced by a large spherical object in an air-filled acoustic cavity
http://aip.metastore.ingenta.com/content/asa/journal/jasa/121/6/10.1121/1.2739110
10.1121/1.2739110
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