Accession Number : AD0626742

Title :   ACOUSTIC ATTENUATION IN A SOLID PROPELLANT,

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : NALL,B. H.

Report Date : APR 1962

Pagination or Media Count : 28

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)

Descriptors :   (*SOLID ROCKET PROPELLANTS, ACOUSTICS), OSCILLATION, EXCITATION, RESONANCE, ATTENUATION, THERMAL PROPERTIES, PRESSURE, COMBUSTION

Subject Categories : Acoustics
      Combustion and Ignition
      Solid Propellant Rocket Engines
      Solid Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE