Abstract
The Air Force commissioned a construction and engineering company to build an indoor test facility for the GAU‐8 Avenger at Hill Air Force Base in Layton, UT. The blast pressures from this 30‐mm Gatling gun, however, are large enough to cause spalling of the concrete walls over time. The facility is being designed and constructed to last for 20 yrs, requiring several acoustical treatments. The pressures from the gun were measured outdoors, with maximum pressures exceeding 3000 Pa (163 dB) at a distance of 30 ft (9.1 m). A computer model of the room was designed using EASE, and impulse responses were generated at several positions. These impulse responses were convolved with an ideal blast wave pulse train to mimic the sound of the gun in the room. From these data and results collected from preliminary tests in the range, recommendations have been provided as to placement and types of necessary treatments. [Work supported by HHI Corporation.]
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