Analytical modeling of the acoustic field during a direct field acoustic test.

Conference · Wed Dec 01 04:00:00 EST 2010

OSTI ID:1038217

Stasiunas, Eric Carl; Rouse, Jerry W; Mesh, Mikhail

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.

• Research Organization: Sandia National Laboratories
• Sponsoring Organization: USDOE
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 1038217
• Report Number(s): SAND2010-8729C
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
A CENTERS
ACOUSTICS
DIMENSIONS
DISTRIBUTION
EXCITATION
ORIENTATION
SENSITIVITY
SIMULATION
TESTING