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Direct-field acoustic testing, or DFAT®, is a technique used for acoustic testing of aerospace structures by subjecting them to sound waves created by an array of acoustic drivers. [1] The method uses electro-dynamic acoustic loudspeakers, arranged around the test article to provide a uniform, well-controlled, direct sound field at the surface ...
In the aerospace industry, acoustic chambers are the main facilities for such tests. A chamber is a reverberant room that creates a diffuse sound field and is composed of an empty volume (from 1 m 3 to 2900 m 3 ) and a multifrequency sound generation system.
The sophisticated facility includes three test ranges – the Weapons Range, the Acoustic Range, and the FORACS Range – all located in the Tongue of the ocean (TOTO), a deep-ocean basin approximately 100 nautical miles (190 km) long by 15 nautical miles (28 km) wide, with depths as great as 6,000 feet (1,800 m).
The Reverberant Acoustic Test Facility has 36 nitrogen-driven horns to simulate the high noise levels that are experienced during a space vehicle launch and supersonic ascent conditions. The RATF is capable of an overall sound pressure level of 163 dB within a 101,500-cubic-foot (2,870 m 3 ) chamber.
Today, Alion conducts advanced acoustical testing operations in the facility for many prominent acoustical material manufacturers and government agencies. In the facility's early days, it also housed a cryptology team that worked to decipher codes from the works of Sir Francis Bacon, Shakespeare, and enemy military communications. [ 4 ]
ISITE Acoustic Test Facility - This facility was designed and commissioned by CSIR-National Aerospace Laboratories, Bangalore, for ISRO Satellite Centre (ISAC), Bangalore, on 7 April 2011. A 1500 Cu.m. Isolated Reverberation Chamber, which can qualify satellites up to 156 dB in Nitrogen atmosphere, is the largest and one-of-its kind in India.
Acoustic Trials Detachment, Titusville, Florida, is the U.S. location managing and supporting the South Tongue of the Ocean (TOTO) Acoustic Measurement Facility (STAFAC) at the Atlantic Undersea Test and Evaluation Center (AUTEC) in the Bahamas. AUTEC is part of Naval Sea Systems Command's Naval Undersea Warfare Center [5] [6]
Acoustic resonance technology (ART) is an acoustic inspection technology developed by Det Norske Veritas over the past 20 years. ART exploits the phenomenon of half-wave resonance, whereby a suitably excited resonant target (such as a pipeline wall) exhibits longitudinal resonances at certain frequencies characteristic of the target's thickness.