The acoustic field generated during a Direct Field Acoustic Test (DFAT) has been analytically modeled in two space dimensions using a properly phased distribution of propagating plane waves. Both the pure-tone and broadband acoustic field were qualitatively and quantitatively compared to a diffuse acoustic field. The modeling indicates significant non-uniformity of sound pressure level for an empty (no test article) DFAT, specifically a center peak and concentric maxima/minima rings. This spatial variation is due to the equivalent phase among all propagating plane waves at each frequency. The excitation of a simply supported slender beam immersed within the acoustic fields was also analytically modeled. Results indicate that mid-span response is dependent upon location and orientation of the beam relative to the center of the DFAT acoustic field. For a diffuse acoustic field, due to its spatial uniformity, mid-span response sensitivity to location and orientation is nonexistent.
Analytical Modeling of the Acoustic Field during a Direct Field Acoustic Test
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Jerry Rouse, Mikhail Mesh, Eric Stasiunas; Analytical Modeling of the Acoustic Field during a Direct Field Acoustic Test. Journal of the IEST 1 October 2011; 54 (2): 1–53. doi: https://doi.org/10.17764/jiet.54.2.j23pv04t1808316u
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