A rolling line source for a seismic sonar
McClelland, Scott C.
Baker, Steven R.
Muir, Thomas G.
MetadataShow full item record
This thesis builds on ideas of a seismo-acoustic sonar as a mine detection tool and is part of an ongoing Naval Postgraduate School (NPS) research project. Building on this foundation of research, a source was developed to enable mobility. The previous NPS array [Sheetz] design employed an array of sources, buried in the sediment in a line. This arrangement is somewhat cumbersome for direct application. A practical device should be mobile and create a high source signal similar to the previous NPS array. A rolling cylinder provided the solution. The cylinder houses two shakers, identical to the previous NPS array elements, mounted directly to the cylinder wall. The source for a single buried array element, from the previous NPS array, and a single rolling cylinder, placed on the surface, were shown to provide similar seismic velocity at ten meters range. Using this rolling source, we measured wave speed at 83 m/s by signal correlation methods. Employing two rolling cylinder sources against a buried 1000 lb bomb at five meters range resulted in echo detection with only internal signal analyzer algorithms. The ability to send and receive signals on the go was proven to be attainable with a rolling line source.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Gnerlich, Charles Henry (Monterey, California. Naval Postgraduate School, 1975-06);An experimental apparatus which will allow the study of the influence of ground effects on a heated cylinder placed in a crossflow of air was designed and constructed. The effects of a wall on the heat transfer characteristics ...
McComas, Jon Philip (Monterey, California. Naval Postgraduate School, 1974-12);The fluid flow and forced convective heat transfer characteristics of a uniformly heated right circular cylinder resting on a flat plate in a crossflow of air were experimentally investigated. The circumferential variation ...
Grider, William H.,Jr. (1986);In previous research on thermomechanically processed high - Mg, \1 - Mg alloys, yield strengths of 276 MPa (40 ksi) were retained after simulated superplastic forming, but ductility at ambient temperature varied from ...