Accession Number:

AD0626742

Title:

ACOUSTIC ATTENUATION IN A SOLID PROPELLANT,

Descriptive Note:

Corporate Author:

JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s):

• NALL,B. H.

Report Date:

1962-04-01

Pagination or Media Count:

28.0

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 meterssec, giving an effective Youngs Modulus 1.1 x 10 to the 10th power dynessq. 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