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Acoustic impedance of perforations in contact with fibrous material
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10.1121/1.2188354
/content/asa/journal/jasa/119/5/10.1121/1.2188354
http://aip.metastore.ingenta.com/content/asa/journal/jasa/119/5/10.1121/1.2188354

Figures

Image of FIG. 1.
FIG. 1.

A perforated plate in a duct.

Image of FIG. 2.
FIG. 2.

Schematic of the impedance tube setup in the absence of mean flow.

Image of FIG. 3.
FIG. 3.

Schematic of the experimental setup for obtaining the acoustic properties of absorbing material in the absence of mean flow.

Image of FIG. 4.
FIG. 4.

Schematic of the experimental setup for obtaining the acoustic impedance of perforations in the absence of mean flow.

Image of FIG. 5.
FIG. 5.

Characteristic impedance and wave number of the fibrous material with ; (a) real part and (b) imaginary part.

Image of FIG. 6.
FIG. 6.

Dimensions of perforated plate samples (unit: centimeters [inch]).

Image of FIG. 7.
FIG. 7.

Pictures of perforated plate samples.

Image of FIG. 8.
FIG. 8.

Comparison of measurements of the acoustic impedance of a hole in contact with air-air; (a) resistance and (b) end correction coefficient.

Image of FIG. 9.
FIG. 9.

Acoustic impedance of a hole, group A; (a) resistance and (b) end correction coefficient.

Image of FIG. 10.
FIG. 10.

Acoustic impedance of a hole, group B; (a) resistance and (b) end correction coefficient.

Image of FIG. 11.
FIG. 11.

Acoustic impedance of a hole, group C; (a) resistance and (b) end correction coefficient.

Tables

Generic image for table
TABLE I.

Fit coefficients of the measured characteristic impedance and wave number.

Generic image for table
TABLE II.

Perforation samples.

Generic image for table
TABLE III.

Measured and of the perforations.

Generic image for table
TABLE IV.

Standard deviations relative to and (%).

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/content/asa/journal/jasa/119/5/10.1121/1.2188354
2006-05-01
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Acoustic impedance of perforations in contact with fibrous material
http://aip.metastore.ingenta.com/content/asa/journal/jasa/119/5/10.1121/1.2188354
10.1121/1.2188354
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