|
|
Aero-Acoustic Research Complex – 11/02/2006
BRRC wins contract to assist in the design and development of a in-flight 3D acoustical aircraft measurement facility.
 Description
Modern techniques characterizing military aircraft noise provide simplistic source descriptions. To improve source descriptions the AFRL has proposed a 300 by 800 foot U-shaped facility capable of collecting synchronized data from 56 microphones. This facility will allow aircraft to fly through the array, collecting fully 3D acoustic data using a NI PXI platform.
Background
This proposed test facility is scheduled to break ground in September 2008. Measurement data from the facility will be used to develop vehicle source noise characteristics. Visualizations of the source spheres and flyover demonstrations will be presented. The technical challenges of the project include the development of data acquisition strategy for a widely distributed microphone array while maintaining high frequency resolution and large dynamic range. These acoustic data will be used to identify the free field stationary noise emitted by an aircraft for all measured spherical angles. The data processing will require removing Doppler frequency shifts, assessing variability of the emitted noise in terms of both spectral and energy levels, and decoupling the direct and reflected waves from the measured acoustical data, . The analysis system will include a real-time graphic user interface to provide verification that sufficient data is collected during a measurement session.
|
Artist Rendition of Aero-Acoustic Research Complex, Courtesy of Frank Mobley |
Click play button to view video.
|
Sponsor: Air Force Research Laboratory - Wright-Patterson AFB, OH |
| |
|
|
|
|
|
|
|
