Award Data

Because of the scarce network bandwidth available on the wireless links, data compression plays a critical role in the wireless system design. We propose to evaluate existing public-domain and commercial lossless data compression packages in the context of wireless networking. The specific criteria used include compression efficiency, compression speed, memory usage, and ease of being incorporat ...

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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 ...

An improved computer module for representing rotor flow field effects on flight dynamics response is proposed for development. This model extends finite-state dynamic inflow models to address current limitations in predicting rotorcraft off-axis response to control inputs. The software module also includes features for representing rotor operation in the vortex ring state. The model is novel ...

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 ...

The main objective of this Phase I program will be to develop a release coating for use with ceramic tooling that will be capable of withstanding cure temperatures in excess of 700F and will have high solvent vapor permeability. The main approach will be to formulate a high temperature film forming silicone resin system by investigating improvements of silicone resins that will be modified with p ...

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 ...

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 ...

Physical Sciences Inc. (PSI) proposes to develop an engineering prototype of an underwater acoustic intensity probe which is described in US Patent #5,392,258. The proposed effort is to bring the probe from a pre-prototype unit as described in the patent, through prototype development and testing. The expected output of the program will be an engineering prototype of the probe, along with d ...