Blast Overpressure Studies.
ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
Pagination or Media Count:
To satisfy the Armys need for realistic safe limits for heavy weapons noise while wearing hearing protection, a 2-12 year study was undertaken. Using active duty military volunteers, 64 subjects established that the auditory system could be adequately protected with the RACAL muff from one to three exposures of the reverberant waveforms obtained from a rocket launcher out of an enclosure. Thus, nonauditory considerations set the exposure limits for this type of waveform. This research was accomplished under Task Order 1. Using 27 subjects, two types of nonlinear increasing attenuation with level hearing protection were evaluated using 6 to 100 exposures of a freefield waveform of 1.5-ms duration. With the limited number of subjects, neither plug was adequate to protect the auditory system from this type of waveform. Several subjects had a temporary threshold shift TTS of their hearing of more than 25 dB. The compressible foam plug did appear to provide adequate protection up to the auditory limits for this waveform. This research was accomplished under Task Order 4.
- Weapons Effects (Biological)
- Acoustic Detection and Detectors
- Protective Equipment