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Acoustical Analysis Of An Indoor Test Facility For A 30-Mm Gatling Gun

Student Name: Shaw, Matthew
Advisor Name: Gee, Kent
Approval Date: 8/1/2009
Report Type: Senior Thesis
Title: Acoustical Analysis Of An Indoor Test Facility For A 30-Mm Gatling Gun
Abstract: The United States Army Engineer District in Sacramento, California, selected HHI Corporation, a design-build construction and engineering firm of Farmington, Utah, to design and build an indoor test facility for the GAU-8 Avenger at Hill Air Force Base, Ogden, Utah. The blast pressures from this 30-mm Gatling gun, however, are large enough to cause spallation of the concrete walls over time. The facility is being designed and constructed to last for over 20 years, 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. Final data confirm that the test facility meets all acoustical and occupational safety requirements.
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