Abstract
The results of vibration and acoustic tests of a missile structure are presented. Sinusoidal vibration surveys, low-level acoustic tests using a random siren as the noise source, and high-intensity random-noise tests to determine the probability of acoustically induced structural failures during underground launch operations were conducted. Resonance frequencies, mode shapes, and damping ratios were determined, and the absolute value of the driving point impedance as a function of frequency was calculated. The correlation between localized excitation (random siren) and excitation of the entire structure during an in-silo launch was investigated. The linearity of acceleration response of skin panels, stringers, and ring frames was determined from 13-octave band analysis of the output signals of accelerometers and of microphones over a range of over-all sound-pressure levels from 140 to 165 db.
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