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The experimental synthesis of random pressure fields: Methodology
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View: Figures


Image of FIG. 1.
FIG. 1.

Theoretical correlation as a function of the normalized separation distance between two microphones, respectively, for a diffuse pressure field (solid), a grazing incident plane wave (dashed), and a streamwise TBL pressure field (dash-dotted).

Image of FIG. 2.
FIG. 2.

Experimental setup for the laboratory synthesis of random pressure fields.

Image of FIG. 3.
FIG. 3.

Block diagram of the arbitrary wave form generator and the signal postprocessor that estimates the spatial errors associated to the excitation and to the panel vibroacoustic response.

Image of FIG. 4.
FIG. 4.

The operating experimental setup.

Image of FIG. 5.
FIG. 5.

A photograph of the microphone array layout.

Image of FIG. 6.
FIG. 6.

A front view of the loudspeakers cabinet.

Image of FIG. 7.
FIG. 7.

Normalized mean-square error calculated at for the simulation of an acoustic diffuse field (solid), a grazing incident plane wave (dashed), and a TBL pressure field (dash-dotted) over an array of microphones, as a function of the distance loudspeakers-microphones normalized by the separation distance between two adjacent loudspeakers.

Image of FIG. 8.
FIG. 8.

The condition number of the acoustic plant matrix measured between the loudspeakers and a number of microphones (thin dashed line, microphones; thick dashed line, microphones; thin solid line, microphones; thick solid line, microphones).

Image of FIG. 9.
FIG. 9.

Sketch of the experimental setup for modal testing.

Image of FIG. 10.
FIG. 10.

Experimental natural frequencies of the test panel vs the theoretical frequencies. For each frequency, the corresponding theoretical (left) and experimental (right) modal deflection shapes are compared.

Image of FIG. 11.
FIG. 11.

Kinetic energy of the test panel when excited by a punctual force: theory (thick line) and experiment (thin line).


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Scitation: The experimental synthesis of random pressure fields: Methodology