Approximate Fluid-Structure Interaction Theories for Acoustic Echo Signal Predictions.
NAVAL RESEARCH LAB WASHINGTON DC
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An approximate scheme for predicting the acoustical echo signals from submerged elastic structures irradiated by incident pulses is proposed and investigated for its effectiveness. This scheme utilizes various approximate fluid-structure interaction theories to first determine the resultant pressure and normal acceleration on the fluid-structure interface and therefrom calculates the far field echo signals by integrating the Helmholtz integral exactly. It is found that a theory termed the second order doubly asymptotic approximation is promising for this scheme. An optimum computation scheme could be a combination of the exact and various approximate theories depending on the wavelength of the incident pulse and the geometry and the dynamic characteristics of the structure. Author
- Acoustic Detection and Detectors