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Acoustic imaging of a duct spinning mode by the use of an in-duct circular microphone array
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10.1121/1.4803519
/content/asa/journal/jasa/133/6/10.1121/1.4803519
http://aip.metastore.ingenta.com/content/asa/journal/jasa/133/6/10.1121/1.4803519
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The illustration of a spinning mode noise ( = 5) and the setup of a downstream in-duct circular array with 16 sensors (denoted by ).

Image of FIG. 2.
FIG. 2.

The grids in polar coordinates for the duct test section.

Image of FIG. 3.
FIG. 3.

Analytical solutions of the modal sound at the cross section  = 0.1 from the spinning mode sound source, where  = 1, () = (3, 1),  = 400, (a) ′, (b) ′, (c) ′, and (d) ′.

Image of FIG. 4.
FIG. 4.

Analytical solutions of the modal sound at the cross section  = 0.1 from the spinning mode sound source, where  = 10, () = (3, 1),  = 400, (a) ′, (b) ′, (c) ′, and (d) ′.

Image of FIG. 5.
FIG. 5.

Observer solutions of the cross section at  = 0.1 from the spinning mode sound source, where  = 1, () = (3, 1),  = 400, (a) , (b) , (c) , and (d) .

Image of FIG. 6.
FIG. 6.

Observer solutions of the cross section at  = 0.1 from the spinning mode sound source, where  = 10, () = (3, 1),  = 400, (a) , (b) , (c) , and (d) .

Image of FIG. 7.
FIG. 7.

The convergence history of the observer error for the case.

Image of FIG. 8.
FIG. 8.

Observation errors with the observer and a Kalman filter if the SNR of the measurements is 10 dB.

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/content/asa/journal/jasa/133/6/10.1121/1.4803519
2013-06-05
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Acoustic imaging of a duct spinning mode by the use of an in-duct circular microphone array
http://aip.metastore.ingenta.com/content/asa/journal/jasa/133/6/10.1121/1.4803519
10.1121/1.4803519
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