ACOUSTICAL ANALYSIS OF FILAMENT-WOUND POLARIS CHAMBERS
Bimonthly progress rept. no. 4
AEROJET-GENERAL CORP SACRAMENTO CA
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This report includes a discussion of the data presentation and data-evaluation techniques, presents the test data obtained to date for both test objectives, and describes the data-acquisition and playback systems and their application. Results from Phase I testing show that there is significant relationship between the sounds emanating from a filament-wound chamber during hydrostatic testing and the structural integrity of the chamber. The measured acceleration amplitude rms during hydrostatic testing is a function of chamber burst pressure and, as the data show, is inversely related to the burst pressure. Comparative data for three chambers tested to both the proof and burst pressure demonstrated the sensitivity of the accelerometer techniques of measurement. The results of Phase II testing show that the velocity of sound in the forward and aft heads and in the cylindrical section of Polaris Model A3X chambers differs 9314, 11, 294, and 10, 608 ftsec, respectively. These data also show that the direction of filament winding and superimposed stress fields do not affect the velocity of sound through a Polaris Model A3X chamber of resin-impregnated E-HTS glass roving.
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