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Characterization and Simulation of an Acoustic Source moving Through an Oceanic Waveguide 1.Introduction Physical assuptions Document outline 2. Acoustic field of a sinusoidal moving source Statement of problem Slution of field 3. Time-varying linear systems Bifrequency analysis Stochastic source Moving-source interpretation Time-varying channel impulse response Modal group velocity Modal time delay 4. Moving-source simulation Computing [...]
ACOUSTIC EMISSION SIGNAL ANALYSIS IN FLAT PLATES ABSTRACT An acoustic emission signal from a deformation or fracture mechanism is assumed to initiate as essentially a point source for detection frequencies in the range of a few megahertz or below. Approximate mathematical expressions for predicting the number of signal durations, were derived and studied for [...]
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