Accession Number:

AD0275951

Title:

Progress Report Number 2. 1 January-31 March 1962.

Descriptive Note:

Corporate Author:

TEXAS UNIV AUSTIN DEFENSE RESEARCH LAB

Personal Author(s):

Report Date:

1962-04-30

Pagination or Media Count:

1.0

Abstract:

Measured values of the analogous acoustic admittance of a 50 ft water-filled fire hose are presented. Curves showing the admittance magnitude and angle are given for two different hose shapes. Measured values of terminating and shunt admittances were used in calculating the transfer ratio of a one-element, side-branch, bellows filter. This transfer ratio expressed in decibels is compared with differences in sound pressure levels measured at the ends of the filter. A proposed analog computer for use with the Defense Research Laboratory acoustic impedance head or mechanical impedance head is described. Transmissibility curves for several variations of the zero stiffness spring pipe hanger are given. Driving point and transfer mechanical mobilities of the DRL pipe vibration isolator are given for two internal pressures. Load versus deflection characteristics of the DRL pipe vibration isolator and the pressure balanced pipe coupling are given for internal pressures of 0, 25, and 100 psig. The stiffness of each of these elements was found to increase with internal pressure, presumably because of changes in the shapes of rubber sealing rings. Author

Descriptors:

• *ACOUSTIC FILTERS
• *ACOUSTIC IMPEDANCE
• HOSES
• HYDROPHONES
• MEASUREMENT
• PIPES
• PRESSURE
• COMPUTER PROGRAMMING
• SOUND
• SPRINGS
• VIBRATION
• VIBRATION ISOLATORS
• WATER
• WAVE PROPAGATION

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE