Accession Number : ADA306527

Title :   An Inverse Method to Measure the Breathing Wave Speed in a Liquid-Filled Cylindrical Shell.

Descriptive Note : Final rept.,

Corporate Author : NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI

Personal Author(s) : Hull, Andrew J.

PDF Url : ADA306527

Report Date : 05 FEB 1996

Pagination or Media Count : 29

Abstract : An inverse method is developed for measuring the breathing wave speed in a liquid filled cylindrical shell. The model used with this method is based on an experimental configuration in which a long cylindrical shell longitudinally excited by a mechanical shaker at one end. The resulting longitudinal wave propagation produces a spatial field in the shell that consists of extensional and breathing waves. End mounted accelerometers and for transducers are used to measure the extensional wave speed. Once this is accomplished, transfer function between five equally spaced hydrophones (in the fluid) and a forward accelerometer are recorded. These data are then combined to yield a closed form value of the complex, frequency dependent breathing wave speed. The experiment included to validate this method is extremely easy to implement and can be rapidly executed.

Descriptors :   *SHELLS(STRUCTURAL FORMS), *WAVE PROPAGATION, *TRANSDUCERS, SPATIAL DISTRIBUTION, TRANSFER FUNCTIONS, ACCELEROMETERS, CYLINDRICAL BODIES, CONFIGURATIONS, ACOUSTIC MEASUREMENT, INVERSION, HYDROPHONES.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE