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Liftoff acoustic environment of the sounding rocket ATK Launch Vehicle (ALV-X1): Prediction versus measurement.

2010; Acoustical Society of America; Volume: 127; Issue: 3_Supplement Linguagem: Inglês

10.1121/1.3383511

1520-9024

Janice Houston, Douglas D. Counter, R. Jeremy Kenny, John Murphy,

Vehicle Noise and Vibration Control

Launched from the Mid-Atlantic Regional Spaceport (MARS) Pad 01B on August 22, 2008, the ATK Launch Vehicle (ALV-X1) provided an opportunity to measure liftoff acoustic noise data. Predicted liftoff acoustic environments were developed by both NASA MSFC and ATK engineers. ATK engineers developed predictions for use in determining vibro-acoustic loads using the method described in the monograph NASA SP-8072. The MSFC ALV-X1 liftoff acoustic prediction was made with the Vehicle Acoustic Environment Prediction Program (VAEPP). The VAEPP and SP-8072 methods predict acoustic pressures of rocket systems generally scaled to existing rocket motor data based upon designed motor or engine characteristics. The predicted acoustic pressures are sound-pressure spectra at specific positions on the vehicle. This paper presents the measured liftoff acoustics on the vehicle and tower. Additionally, the ALV-X1 liftoff data can be scaled to define liftoff environments for the NASA Constellation program Ares vehicles.