An experiment was performed to measure the scattering of underwater sound from a porous solid for the first time. Two porous solid spheres somposed of heat-epoxied glass beads of 100 and 500 micron mean bead diameter were used. The permeability, porosity, and shear modulus of each sample were estimated from measurements made on cylindrical samples which had been manufactured at the same time and of the same glass beads as the spheres. These material poperties were used as input to a theoretical model for the sound scattered from a poro-elastic sphere imbedded in a poro-elastic host developed by Kargl and Lim. The experimental data were compared to the theoretical calculations. Theoretical calculations with 0%, 3%, and 10% skeletal fram damping were compared to experimental data. Very good agreement between measured and predicted scattering was obtained for each sample over certain frequency ranges, taking 10% fram damping in the calculations. For other frequency ranges the agreement was less than good. No systematic trend in the agreement could be discerned with regard to prous grain size or sound frequency
| Identifer | oai:union.ndltd.org:nps.edu/oai:calhoun.nps.edu:10945/26233 |
| Date | 09 1900 |
| Creators | Huskey, Theodore W. L. |
| Contributors | Steven R. Baker, NA, NA, Applied Science |
| Publisher | Monterey, California. Naval Postgraduate School |
| Source Sets | Naval Postgraduate School |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
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