Award Data

Monopole and dipole antennas have been determined to radiate most efficiently when the size of the antenna is proportional to the frequency being transitted or received, ie.e, one-quarter, one-half or one wavelength. As the operating frequency is varied from that ideal frequency, nulls begin to develolp which threaten the integrity of the communication link. Experience has shown that small excusio ...

The contractor has patented technology for a unique process that directly converts a two-dimensional acoustic disturbance, such as a wave front, into an intensity-mapped visible image in real-time without electronic circuitry; i.e., it is a direct pressure gradient imager. This device can allow a small, battery powered acoustic source to be easily located and ranged using a small flashlight sized ...

"Under Phase I array-processing techniques were developed andanalyzed which provided an effective interference rejectioncapability for acoustic intercept systems. This was demonstratedvia computer analysis and simulation of these techniques asapplied to a volumetric acoustic intercept sensor. It was shownthat, using such an array, an adaptive spatial normalizationtechnique could be used to suppr ...

"The 3 inch Acoustic Device, Countermeasure (ADC) MK2 is theNavy's standard torpedo countermeasure which has been deployedon submarines for over 20 years. The Mobile ADC MK2 device iscurrently under development and will provide significanttactical value in putting as much seperation between thelaunching submarine and the countermeasure as possible. Inorder to maximize the mobility effectiveness ...

The goal of this project is to develop and demonstrate a data fusion system for all active and passive submarine acoustic sensors. The system will perform association of all data associated with a common contact. Associated data will be used to provide improved track estimates and classification performance uncluttered shallow water environments. In Phase I a conceptual design will be developed ...

The overall objective of the proposed research is to develop bistatic detection techniques for shallow water near land warfare operations. The focus of our proposed research is to achieve detection enhancement in environments characterized by dense multipath through application of optimal detection theory coupled with accurate acoustic modeling. The first specific objective is to consider alternat ...

Modern aircraft contain more and more lightweight, but easily damaged, composite structures, with no way to detect in-flight composite delimination or impact damage. Innovative Dynamics (IDI) proposes to address this problem by developing a distributed damage detection system based on embedded piezoelectric actuators/sensors. Prior IDI research showed that an embedded piezoceramic actuator/sensor ...

Significant savings in system life cycle costs can be realized when common Automated Test Systems (ATS) resources are used to meet both system production and field maintenance needs. Additional cost avoidance and quality gains are the result of transferring unit under test (UUT) design data, "lessons learned" gained during manufacturing in-process and system acceptance (sell-off) testing to the ma ...

"Barrel erosion, which is produced by the combination of hightemperature and pressure with aggressive propellant combustionproducts, and the action of the projectile, results in decreasedmuzzle velocities, increased projectile yaw, and decreasedaccuracy. New material designs are needed to mitigate erosion ingun barrels, which limits service lifeCeramic composites are a leading material candidate ...

An existing 3D Eulerian code for computing incompressible flows will be enhanced to enable underwater explosion simulations, focusing especially on free-field bulk cavitation, bubble growth and collapse, and bubble jetting. The emphasis will be onimproving the accuracy and efficiency of the code's algorithms for simulating underwater shock. Currently the code includes level set methods, adaptive m ...