Noise mitigation at the Combat Arms Training Facility, Wright Patterson Air Force Base, Dayton, OH.
Murphy-WJ; Zechmann-EL; Kardous-CA
J Acoust Soc Am 2012 Sep; 132(3)(Pt. 2):2084
The Combat Arms Training Facility (CATF) at Wright Patterson Air Force Base in Dayton Ohio was evaluated for the effect of noise treatment to the interior of the firing range. Measurements were conducted in 2009 and 2010 before and after noise treatment. Reverberant energy in the range was reduced through the installation of cementatious shredded fiber board and basalt rock wool to the walls and ceiling of the range. No modifications were made to the windows and doors connecting the range interior to adjacent rooms. Prior to the application of noise treatment, the reverberation times (RT60) ranged from about 3.5 seconds at 100 Hz to about 1.3 seconds at 10 kHz. Following application of the noise treatments, the RT60 was reduced to about 1.6 seconds at 100 Hz to 0.5 seconds at 10 kHz. The critical distance for speech intelligibility increased from about 12 feet to about 22 feet in the speech frequencies 800 to 4000 Hz. The Articulation loss of consonants was improved from 22.5 for the untreated range to 7.2 for the treated range. The noise treatments reduced the reverberation time, increased the critical distance and improved speech intelligibility in the CATF firing range.
Noise-measurement; Noise; Noise-exposure; Noise-levels; Acoustics; Sound; Exposure-levels
William J. Murphy, National Institute for Occupational Safety and Health, 4676 Columbia Parkway, Mailstop C-27, Cincinnati, OH 45226-1998
Journal of the Acoustical Society of America