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. The method uses electro-dynamic acoustic loudspeakers, arranged around the test article to provide a uniform, well-controlled, direct sound field at the surface of the unit under test. The system employs high capability acoustic drivers, powerful audio amplifiers, a narrow-band multiple-input-multiple-output (MIMO) controller and precision laboratory microphones to produce an acoustic environment that can simulate a helicopter, aircraft, jet engine or launch vehicle sound pressure field. A high level system is capable of overall sound pressure levels in the 125–147 dB for more than one minute over a frequency range from 25 Hz to 10 kHz.

ADAPTive Systems –

These comprehensively integrated systems utilize a high resolution array of discretely powered and processed acoustical devices in concert with powerful EAW Resolution software to create optimized results at show speed without the need for physical reconfiguration. Adaptive systems can autonomously determine their array configuration, continuously analyze every system element and even heal the system coverage in the unlikely event of a fault. Simply put – these systems will forever change the world of sound reinforcement.

The use of Adaptive systems in vibration testing can provide superior test results in the DFAT industry by use of the ADAPTive acoustic steering technology and High output capabilities. It is possible with ADAPTive systems to target a specific point on a test subject to focus the acoustic energy to a small location or large broad test. The ADAPTive technology can also actively avoid certain areas on the test subject. This ability to steer the energy provides engineers with a better data for use in designing structures and systems for mission critical applications.

The convenience, low cost, and mobility of this method distinguish it from conventional testing and are the primary reasons for its growing popularity. The method is convenient because all required sound system, power generation and distribution and data acquisition and control equipment is brought to the test site. Never risk transporting your test subject again with onsite Acoustic Vibration testing.