Laboratory for Structural Acoustics

Agency/Department

FLC Region

Security Lab

No

Address

4555 Overlook Avenue S.W.
Washington

(P)

202-767-3083

Description

FUNCTION: Supports experimental research where acoustic radiation, scattering, and surface vibration measurements of fluid-loaded and non-fluid-loaded structures are required. Typically, ultra-high-precision measurements are conducted in this pristine laboratory environment using submarine hull backing impedance simulators, torpedoes, scale-model submarine structures, and deactivated mine targets.

DESCRIPTION: The large acoustic tank-t he core research capability for in-water structural acoustics studies-is 55 ft in diameter, 50 ft deep, and contains 800,000 gal of deionized water. The entire tank is vibration and temperature isolated. The laboratory is instrumented with precision measurement systems that include large workspace in-water robotic scanners capable of generating nearfield acoustic holography (NAH) radiation and scattering databases.

INSTRUMENTATION: Network-based automated data acquisition and process control including extensive use of robotic scanners. Other attributes and resources include compact measurement ranges using nearfield sources and receivers; multiaxis laser Doppler vibrometry (LDV) for noncontact surface motion measurements; extensive interferometric fiber-optic sensor instrumentation; matrix processors that support MIMO control applications; multiple workstations and file servers to support acquisition, structural acoustics calculations, and visualizations; and structural acoustics codes: SARA2D, SARA3D, ANSYS, NISA, FEMLAB, and SONAX.

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