Accession Number:

ADD019149

Title:

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

Descriptive Note:

Patent, Filed 21 Mar 97, patented 26 May 88,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s):

Report Date:

1998-05-26

Pagination or Media Count:

8.0

Abstract:

Disclosed is an inverse method for measuring the breathing wave speed in a liquid-filled cylindrical shell. The model used with this method is based on an experimental configuration where a shell is attached to a mechanical shaker at the forward end, which initiates longitudinal wave propagation. The resulting spatial field in the shell consists of extensional and breathing waves. End-mounted accelerometers and force transducers are used to measure the extensional wave speed. Once this is accomplished, transfer functions between five equally spaced hydrophones that are 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 executed in a short period of time.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE