Model experiments on air-coupled surface waves

Experiments carried out by Donato [J. Acoust. Soc. Am. 63, 700–703 (1978)] demonstrated a continuous wave field behavior consistent with the formation of an air-coupled surface wave above an impedance boundary consisting of a hard-backed rectangular rigid lattice. He found it necessary to adjust the...

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Veröffentlicht in:The Journal of the Acoustical Society of America 1992-10, Vol.92 (4_Supplement), p.2431-2431
Hauptverfasser: Hutchinson-Howorth, C., Attenborough, Keith
Format: Artikel
Sprache:eng
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Zusammenfassung:Experiments carried out by Donato [J. Acoust. Soc. Am. 63, 700–703 (1978)] demonstrated a continuous wave field behavior consistent with the formation of an air-coupled surface wave above an impedance boundary consisting of a hard-backed rectangular rigid lattice. He found it necessary to adjust the impedance of the lattice, predicted according to a thin-air-layer model, to fit the measured impedance and attributed the required adjustment to clamping of the sample in the impedance tube. A repetition of Donato’s continuous wave experiment is reported. A rectangular pore model for the impedance of the lattice is found to give better agreement with measured impedance data than a thin-layer model. Pulse experiments are reported that show clear evidence of the air-coupled surface wave as a separate arrival and the observed dependence on the measurement geometry is in good accord with predictions.
ISSN:0001-4966
DOI:10.1121/1.404635