ACOUSTIC ATTENUATION IN A SOLID PROPELLANT,
Abstract
The acoustic attenuation in 1-inch diameter by 15-inch long rods cast from a double base propellant mixture was measured for longitudinal excitation from 500 to 14,000 cps in discrete steps by the successive use of quarterwave resonance, half-wave resonance and pulse techniques. The data are observed to give a reasonable fit to a Q of 5.5. No change in Q is observed for quarterwave resonance data taken over the range of temperatures 55-75F, but the velocity of sound in the rod is found to be a sensitive decreasing function of the temperature. The effect on halfwave resonance of increasing the static pressure from one atmosphere to 1000 psi is found to be small, with a slight decrease in Q and in velocity. Room temperature propellant sound velocity is about 810 meters/sec, giving an effective Young's Modulus = 1.1 x 10 to the 10th power dynes/sq. cm. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1962
- Accession Number
- AD0626742
Entities
People
- B. H. Nall
Organizations
- Johns Hopkins University Applied Physics Laboratory