Fully Articulating Air Bladder System (FAABS) Noise Attenuation Performance in the HGU-56/P and HGU-55/P Flight Helmets.

摘要

The Air Force Research Laboratory's (AFRL) Battlespace Acoustics Branch collected passive noise attenuation performance data on both the HGU- 56/P and the HGU-55/P flight helmets with the Fully Articulating Air Bladder System (FAABS) to compare to the noise attenuation performance of the helmets with regular shims. All data was collected in accordance with ANSI S12.6-2008. The noise attenuation performance results revealed that the helmets with FAABS performed better when compared to the helmets with regular shims across all frequencies from 125 to 8000 Hz (except at 2000 Hz where equal performance was measured in the HGU-56/P helmet). Any modification to the helmet system must first receive approval before flight; these measurements meet the safe-to-fly checklist requirement for noise attenuation.