Acoustic Tests on a New Motor Generator System for the Minuteman Launch Control Centers in Hill Engineering Test Facilities I and II, Hill AFB, Utah
AIR FORCE OCCUPATIONAL AND ENVIRONMENTAL HEALTH LAB BROOKS AFB TX
Pagination or Media Count:
Post critical design review acoustic tests were performed in Hill Engineering Test Facilities I and II HETF on a proposed new motor generator system for the Minuteman Launch Control Centers LCC. A performance noise criteria equivalent to a preferred noise criterion PNC-50 curve was established as the standard by which to judge the effectiveness of the new motor generator. Measurements were obtained at both the commanders console and the deputy commanders console. Results indicated the noise from the motor generator as configured in HETF I the small LCC exceeded the PNC-50 criteria primarily in the 63 hertz Hz octave band by 10 decibels dB when operated in both the AC and DC modes. The motor generator as configured in HETF II the large LCC exceeded the PNC-50 criteria by 3 dB in the 125 Hz octave band only at the deputy commanders console when operated in the AC mode. Acoustic intensity measurements were obtained to isolate specific noise sources and determine the transmission loss of the floor panels. Vibration measurements were also made on and near the motor generator to determine paths of structure-borne vibration energy. Specific recommendations for improving the acoustic environment in the LCCs are presented.
- Electric Power Production and Distribution
- Guided Missile Launching and Basing Support