Applying the shunted loudspeaker for low-frequency sound attenuation

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Conference Proceeding
INTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, 2017, 2017-January
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© 2017 Institute of Noise Control Engineering. All rights reserved. Thin and light materials for low-frequency sound attenuation are required in the noise control. Recent research showed that a loudspeaker connected with a shunt circuit can provide good sound absorption performance with a subwavelength thickness as the acoustic metamaterials. In this paper, the sound attenuation in a duct with such a shunted loudspeaker is investigated. Numerical simulations demonstrate that when the diaphragm of a shunted loudspeaker serves as a soft boundary, it can reduce the sound at low frequency. Moreover, the location of the shunted loudspeaker is also studied when the end of the tube is rigid.
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