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A numerical study of defect detection in a plaster dome ceiling using structural acoustics
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10.1121/1.3133922
/content/asa/journal/jasa/126/1/10.1121/1.3133922
http://aip.metastore.ingenta.com/content/asa/journal/jasa/126/1/10.1121/1.3133922

Figures

Image of FIG. 1.
FIG. 1.

(a) The geometry of the elliptical ceiling and location of the acoustic source (viewed from beneath the ceiling), (b) the boundary conditions assumed in the finite element calculation, and (c) the mesh used in conjunction with the -finite element code (viewed from above the ceiling).

Image of FIG. 2.
FIG. 2.

(a) The geometry of the defect (plan view from above the ceiling). The insert shows a circular flaw having the same area as the pie-shaped flaw. (b) The boundary conditions for the ceiling with detached defect. (c) The boundary conditions for the ceiling with deconsolidated defect.

Image of FIG. 3.
FIG. 3.

Normal displacement levels for the unflawed ceiling calculated with the STARS3D code for four frequencies (displayed on the exposed surface of the ceiling).

Image of FIG. 4.
FIG. 4.

Surface pressure levels for a perfectly rigid elliptical ceiling calculated with the STARS3D code for four frequencies (displayed on the exposed surface of the ceiling).

Image of FIG. 5.
FIG. 5.

The ratio of detached flaw displacement to that of the healthy ceiling versus the circular flaw radius computed from the static expression of Eq. (4) for three plaster thicknesses.

Image of FIG. 6.
FIG. 6.

The resonance frequency versus circular flaw radius computed using Eq. (6) based on a lumped parameter model for two plaster thicknesses.

Image of FIG. 7.
FIG. 7.

Normal displacement levels for the flawed ceiling (detached segment) calculated with the STARS3D code for four frequencies (displayed on the exposed surface of the ceiling).

Image of FIG. 8.
FIG. 8.

Normal displacement levels for the flawed ceiling in an area around the flaw calculated with the STARS3D code for four frequencies (displayed on the exposed surface of the ceiling): (a) detached flaw and (b) deconsolidated flaw.

Tables

Generic image for table
TABLE I.

Dynamic displacements, total force acting on flaw, and wavelengths.

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/content/asa/journal/jasa/126/1/10.1121/1.3133922
2009-07-01
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A numerical study of defect detection in a plaster dome ceiling using structural acoustics
http://aip.metastore.ingenta.com/content/asa/journal/jasa/126/1/10.1121/1.3133922
10.1121/1.3133922
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