Inverse Method to Measure the Breathing Wave Speed in a Liquid-Filled Cylindrical Shell.
Patent, Filed 21 Mar 97, patented 26 May 88,
DEPARTMENT OF THE NAVY WASHINGTON DC
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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.
- Fluid Mechanics