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An acoustic projector suitable for long range signaling in the ocean is described. The design employs a novel approach, which could result in projectors of high performance, high efficiency, operation at any depth, and substantially reduced cost. Resolution of short pulses fundamentally requires acoustic energy spread over a broad band. Traditionally this has been done with projectors that pe ...

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The increasing number and complexity of HLA-based distributed simulation exercises has created an urgent need for a suite of commercially-supported HLA Runtime Analysis and Monitoring (RAM) tools. These tools must provide a clear, accurate and timely view into the dynamic virtual battlefield and its supporting infrastructure while also providing supervisory control of all federates. Mak Technolo ...

The development of an innovative, affordable and automated system for near-surface, real-time, remote sound velocity profiler to measure the velocity of a transmitted acoustic pulse as a function of depth is proposed. Alternative technologies for environmental sampling will be explored and a tradeoff study to determine the most promising approach will be conducted. A design concept study to dete ...

Oriented composites of PZT and polymer can have properties superior to ordinary PZT as drivers for sonar transducers and hydrophones because they have a lower Poisson ratio, and a lower dielectric constant. Terfenol-D is superior to ordinary PZT because it has larger maximum strains and higher energy density, and is not subject to fatigue or depoling. For these reasons, composite Terfenol-D shou ...

ONE OF THE IMPORTANT UNRESOLVED OPERATIONAL PROBLEMS AT NUCLEAR POWER PLANTS IS CAVITATION IN CONTROL VALVES. EACH YEAR COSTLY SHUTDOWNS ARE NECESSARY TO REPAIR VALVES DAMAGED BY CAVITATION. THE PROBLEM IS MORE THAN JUST AN ECONOMICAL BURDEN ON THE UTILITY, IT CAN CREATE SAFETY-RELATED PROBLEMS BECAUSE A VALVE DAMAGED BY CAVITATION MAY NOT BE ABLE TO PERFORM ITS INTENDED FUNCTION. THE PRIMARY REAS ...

In order to realize the full potential of cryogenic power converters, it is vital to develop the technology for cryogenic capacitors and inductors, in order to be combined with the switching semiconductors. Capacitors with high dielectric constant and high voltage withstand at cryogenic temperatures with low weight and volume lie on the critical path. The proposed work focuses on innovative tech ...

ACOUSTIC FIELDS CAN BE DESIGNED TO COAX LIQUID BORNE SUBMICRONIC PARTICLES TO ANNOUNCE THEIR PRESENCE LOUDER THAN THE USUAL SCATTERING SIGNALS WHICH ARE PRIMARILY DETERMINED BY THE DENSITY AND COMPRESSIBILITY CONTRAST BETWEEN THE PARTICLE MATERIAL AND THE HOST FLUID. WE EXPECT A SIGNAL ENHANCEMENT OF AT LEAST 60DB. THE KEY CONCEPT IS TO COAX THE PARTICLES TO SOFT CAVITATE AND DETECT THE ENSUING TR ...