BRRC, in partnership with BYU, developed innovative measurement and analysis methods using Near-field Acoustic Holography (NAH) to provide high-quality acoustic data and characterization of the jet-noise source region. The design includes a 150-channel NAH measurement array and data acquisition system, and a state-of-the-art holography processing capability. The prototype system was deployed to perform jet source-noise measurements from an F-22 at Holloman AFB in New Mexico. The culmination of this effort resulted in the ability to show how the scan-based measurements along one plane can be processed using NAH to produce a three-dimensional holographic representation of the sound radiation. This is the first time such a map has been obtained for a full-scale military jet aircraft. Learn more...
Acoustical Data Acquisition System for the Aeroacoustic Research Complex, NM
BRRC supported the design and development of the Aeroacoustic Research Complex (ARC) acoustic measurement system. The ARC facility provides improved characterization of in-flight noise directivity by providing synchronized three-dimensional magnitude and spectral acoustical signatures from 56+ microphones. BRRC designed the state-of-the-art custom multichannel acoustic measurement systems and sensor hardware architecture, and collaborated on construction logistics and measurement protocol development. Image Credit: US Air Force
Energy-Based Acoustic Measurement System for Rocket Noise, UT
BRRC, in partnership with Brigham Young University, has developed advanced acoustic measurement, analysis, and modeling techniques for launch load predictions. Multiple full-scale static test fires have been performed at ATK Space Systems Test Services in Promontory, UT. This collected data was used to evaluate the measurement system and compare the performance of multiple probe prototype designs, evaluate historical rocket noise prediction methods, and to guide the development of future launch noise prediction models. Image Credit: Alliant Techsystems
Fort Stewart and Hunter Army Airfield Supplemental EA, GA
BRRC personnel visited Fort Stewart to assess their current noise monitoring program. This assessment included a review of the current noise environment for range explosions, an examination of their noise monitoring equipment, and acquisition of acoustical data to verify the proper operation of the monitors. BRRC’s assessment provided options for system-wide improvements and helped develop a suitable noise-monitoring program. This assessment included maintenance schedules appropriate for the current equipment and recommendations on improved noise data processing.