| Developing and Assessing Immersive Content for Naval Training: Lessons Learned in the Virtual World |
Oct 2012 |
6 pages |
| Authors:
Jason H Wong; Anh B Nguyen; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
 | Content was developed in an immersive, 3-D virtual world (SecondLife Enterprise) as a pilot project to support a Navy training need to teach complex, highly visual concepts in an engaging fashion. An avatar-based virtual world was used due to their unique social and content creation properties. This project consisted of a series of modules designed to teach the naval concept of target motion analysis. The resulting ?immersive learning trail? augmented ... |
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| Vessel Noise Affects Beaked Whale Behavior: Results of a Dedicated Acoustic Response Study |
Aug 2012 |
10 pages |
| Authors:
Enrico Pirotta; Rachael Milor; Nicola Quick; David Moretti; Nancy Di Marzio; Peter Tyack; Ian Boyd; Gordon Hastie; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| Some beaked whale species are susceptible to the detrimental effects of anthropogenic noise. Most studies have concentrated on the effects of military sonar, but other forms of acoustic disturbance (e.g. shipping noise) may disrupt behavior. An experiment involving the exposure of target whale groups to intense vessel-generated noise tested how these exposures influenced the foraging behavior of Blainville's beaked whales (Mesoplodon densirostris) in the Tongue of the Ocean (Bahamas). A ... |
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| Sharing the Wealth: Towards Ocean Sensing Networks |
Aug 2012 |
5 pages |
| Authors:
Rand LeBouvier; Donald Steinbrecher; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| Autonomous Underwater Vehicles (AUVs) and associated undersea technologies have demonstrated exceptional current utility and great growth potential for military, governmental and commercial maritime agencies as well as for ocean research institutions. While sustained and aggressive research, development, testing and evaluation is still in order, the technology is available now to benefit potential consumers with the incredible range of data these systems can already provide . Although unmanned systems in other ... |
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| Environmental Planning, Energy Efficiency and Renewable Energy Initiatives in Newport, Rhode Island |
24 May 2012 |
29 pages |
| Authors:
Tara Moll; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| Determination of Acoustic Effects on Marine Mammals and Sea Turtles for the Atlantic Fleet Training and Testing Environmental Impact Statement/Overseas Environmental Impact Statement |
12 Mar 2012 |
108 pages |
| Authors:
Carroll Ciminello; Roy Deavenport; Thomas Fetherston; Karin Fulkerson; Peter Hulton; Dennis Jarvis; Bert Neales; Jerry Thibodeaux; Jason Benda-Joubert; Amy Farak; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| The United States Navy is required to assess potential effects of Navy-generated anthropogenic sound in the water in order to comply with federal environmental laws and regulations, including the National Environmental Policy Act, Executive Order 12114, the Marine Mammal Protection Act, and the Endangered Species Act. The acoustic effects assessment for Phase II of the Tactical Training Theater Assessment and Planning Program uses quantitative analysis methodology to estimate acoustic exposures ... |
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| Determination of Acoustic Effects on Marine Mammals and Sea Turtles for the Hawaii-Southern California Training and Testing Environmental Impact Statement/Overseas Environmental Impact Statement |
12 Mar 2012 |
100 pages |
| Authors:
Carroll A Ciminello; Roy Deavenport; Thomas Fetherston; Karin Fulkerson; Peter Hulton; Dennis Jarvis; Bert Neales; Jerry Thibodeaux; Jason Benda-Joubert; Amy Farak; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| The United States Navy is required to assess potential effects of Navy-generated anthropogenic sound in the water in order to comply with federal environmental laws and regulations, including the National Environmental Policy Act, Executive Order 12114, the Marine Mammal Protection Act, and the Endangered Species Act. The acoustic effects assessment for Phase II of the Tactical Training Theater Assessment and Planning Program uses quantitative analysis methodology to estimate acoustic exposures ... |
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| Dive Distribution and Group Size Parameters for Marine Species Occurring in Navy Training and Testing Areas in the North Atlantic and North Pacific Oceans |
12 Mar 2012 |
234 pages |
| Authors:
Stephanie L Watwood; Danielle M Buonantony; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| One important element of Phase II environmental planning is the acoustic effects analysis executed with the Navy Acoustic Exposure Model (NAEMO) software. NAEMO was developed to explore possible exposure of anthropogenic sound on marine animals, combining established acoustic propagation modeling with data regarding the distribution and abundance of marine species. This report recommends species-typical static depth distributions and group size information for all marine mammal and sea turtle species that ... |
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| Exploration of Self-Regulation in the Natural Swimming of the Paramecium's Cilium |
01 Feb 2012 |
81 pages |
| Authors:
Promode R Bandyopadhyay; Joshua C Hansen; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| This report explores the mechanics of the motion (and the aspects of bio-physical self-regulation of this motion) in the paramecium's cilium. The paramecium is a single-cell animal widely found in oxygenated aquatic environments. These animals propel themselves, albeit with limited maneuverability, by the synchronous motion of numerous tiny cilia populated around their flexible bodies. Three theoretical models are given: (1) a torsional pendulum model of beat frequency, (2) a nonlinear ... |
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| Method for Remotely Measuring Fluctuations in the Optical Index of Refraction of a Medium |
09 Nov 2011 |
21 pages |
| Authors:
Lee E Estes; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| A method is provided for remotely measuring index of refraction fluctuations. From a first location, an optical beam is focused at a focal plane located at a second location in a medium of interest. As a result, a beam of energy is backscattered towards the first location. At the first location, a size of the backscattered beam is determined where the size is indicative of strength of fluctuations in the ... |
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| Horns as Particle Velocity Amplifiers |
Nov 2011 |
6 pages |
| Authors:
Dimitri M Donskoy; Benjamin A Cray; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| Preliminary measurements and numerical predictions reveal that simple, and relatively small, horns generate remarkable amplification of acoustic particle velocity. For example, below 2 kHz, a 2.5 cm conical horn has a uniform velocity amplification ratio (throat-to-mouth) factor of approximately 3, or, in terms of a decibel level, 9.5 dB. It is shown that the velocity amplification factor depends on the horn's mouth-to-throat ratio as well as, though to a lesser ... |
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| Impedance Compensation Method for Giant Magneto-Impedance Magnetic Sensors to Null Out the Terrestrial Residual Magnetic Field |
31 Oct 2011 |
20 pages |
| Authors:
James D Hagerty; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| The invention is a method, described with the appropriate auxiliary electronic circuitry, for compensating the effect of the earth s magnetic field on Giant Magneto-Impedance magnetic sensors. The method as taught is an alternate way of cancelling out the effect of the very large residual earth s magnetic field using an impedance-tuning circuit (i.e. electrical compensation) rather than the usual magnetic type of compensation. |
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| Method for Detecting a Random Process in a Convex Hull Volume |
04 Oct 2011 |
84 pages |
| Authors:
Jr O'Brien Francis J; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| A method is provided for characterizing data sets containing data points. The method can characterize the data sets as random or as non-random. In the method, a convex hull envelope is constructed which contains the data points and passes through at least four non-coplanar data points. The convex hull envelope is partitioned into cells. The method classifies the data set as a sized sample. Based on the classification, a predetermined ... |
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| A System and Method for Detection of Noise in Sparse Data Sets with Edge-Corrected Measurements |
30 Sep 2011 |
39 pages |
| Authors:
Jr O'Brien Francis J; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| A signal processing system and method includes a transducer for receiving an analog signal having a random component and possibly an information component. The analog signal is converted into a digital signal having sample points. A nearest-neighbor calculation component calculates the expected average nearest neighbor distance between the sample points, the actual average distance and an error value. These values are corrected for edge effects. A first randomness assessment compares ... |
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| A Device for Recovery of Physical Objects |
29 Sep 2011 |
31 pages |
| Authors:
Nathan Johnnie; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| A device for recovery of physical objects includes a chain having two ends and a retriever attached to one of the ends. The retriever is configured to locate the object to be recovered and to grasp and retrieve that object once located. The retriever includes transducers that detect acoustic frequencies propagating in a fluid medium. Independent transponders, which can be deployed from the retriever; are provided for deployment in an ... |
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| System and Method for a Simple Network Management Protocol Downtime Calculator |
21 Sep 2011 |
35 pages |
| Authors:
Kevin C Mattos; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| A system and method for simple network management protocol downtime calculator includes storing a log comprising a plurality of trap events from corresponding nodes in a subsystem in a network, the plurality of trap events comprising down events and up events, parsing the log to separate down events and up events, pairing down events with corresponding up events, the pairing including matching, for the at least one node in the ... |
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| An Acoustic Multifunctional Standard Calibration Method |
09 Sep 2011 |
14 pages |
| Authors:
Dehua Huang; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| A method for using a deployable, small package acoustic transmitter device is taught, which serves as a standard acoustic source for on-vessel, in-mission field calibration purposes. The method involves deploying an acoustic transmitter device underwater to provide a predefined acoustic energy source for sonar array detection as well as periodic time-coded acoustic signal pulses for tracking and calibration of passive ranging. |
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| Soft Body Armor: An Overview of Materials, Manufacturing, Testing, and Ballistic Impact Dynamics |
01 Aug 2011 |
34 pages |
| Authors:
Paul V Cavallaro; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| This report documents the development of today's soft body armors including their designs, materials, manufacturing methods, National Institute of Justice ballistic and North Atlantic Treaty Organization fragment threat categories, and qualification testing requirements. Material characteristics are discussed for each of the multiple material dimensional scales, which include the molecular, fiber, yarn, and fabric scales. Ballistic impact effects on single fibers and both single and multilayered woven fabrics are presented as ... |
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| Graphical User Interface for Flow Noise Modeling, Analysis, and Array Design |
25 Jul 2011 |
41 pages |
| Authors:
Alia W Foley; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| A system is provided that employs a programmable computer on which a graphical user interface provides parametric design and analysis of pressure sensor arrays used in aero- or hydroacoustic investigations. Use of the system allows for scientific and parametric investigations of turbulent boundary layer physics, as well as iterative array design optimization. Additionally, the system including the graphical user interface facilitates comparison of the results of current models for wall ... |
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| Performance Analysis of Adaptive Probabilistic Multi-Hypothesis Tracking With the Metron Data Sets |
08 Jul 2011 |
6 pages |
| Authors:
Christian G Hempel; Tod Luginbuhl; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| The Probabilistic Multi-hypothesis Tracking (PMHT) algorithm [1] is a batch type multi-target tracking algorithm based on the Expectation-Maximization (EM) method [2]. Unlike other popular batch methods (e.g., Multi-Hypothesis Tracking, MHT) the computational burden of PMHT grows linearly in the size of the batch, the number of clutter detections, and the number of targets tracked. this is achieved by employing the independent assignment model for assigning measurements to tracks which gives ... |
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| Virtual Worlds for C2 Design, Analysis, and Experimentation |
JUN 2011 |
30 pages |
| Authors:
Steven Aguiar; Philip Monte; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| This paper will address the ability of recent technological advances in Virtual Worlds (VWs) to affect better submarine C2 design via increased participation by the fleet personnel in design and experimentation. With the rapid emergence and evolution of VWs over the past three years, the US Navy has investigated and applied multiple applications of this technology to the undersea warfare (USW) domain. One area of application that is currently being ... |
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| Method for Enabling the Electronic Propagation Mode Transition of an Electromagnetic Interface System |
31 May 2011 |
16 pages |
| Authors:
Donald H Steinbrecher; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| A propagating mode transition system provides a transition from a free-space-propagating electromagnetic energy field, which is partitioned by an array of elongate elements, to a transverse electromagnetic-mode propagating energy field in a transmission line. Electrically-conductive pads are disposed on a substrate with the pads being arranged in spaced-apart fashion. Each pad is substantially covered by and electrically coupled to one of the elongate elements at a base thereof such that ... |
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| White Nail Radio Transmitter: Billion Dollar Savings through Energy Efficiency |
10 May 2011 |
27 pages |
| Authors:
Stuart Dickinson; Donald H Steinbrecher; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| Eddy-Current Non-Inertial Displacement Sensing for Underwater Infrasound Measurements |
MAY 2011 |
7 pages |
| Authors:
Dimitri M. Donskoy; Benjamin A. Cray; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| A non-inertial sensing approach for an Acoustic Vector Sensor (AVS), which utilizes eddy-current displacement sensors and operates well at Ultra-Low Frequencies (ULF), is described here. In the past most ULF measurements (from mHertz to approximately 10 Hertz) have been conducted using heavy geophones or seismometers that must be installed on the seafloor; these sensors are not suitable for water column measurements. Currently, there are no readily available compact and affordable ... |
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| Maximizing Effectiveness Using a Flexible Inventory |
30 Apr 2011 |
36 pages |
| Authors:
Manbir Sodhi; James Ferguson; Marie Bussiere; Betty Jester; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| Although uncertainty in production and inventory systems is not desirable predictions for demand are inherently uncertain. When the set of products is complex, that is, composed of multiple subassemblies, and there are shared subassemblies amongst different product types, the option for storing partially completed assemblies may also help in meeting demand uncertainties. Furthermore, as new technology is developed and new models are added to the inventory, older models can sometimes ... |
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| An Efficient Implementation of a Batch-Oriented, Multitarget, Multidimensional Assignment Tracking Algorithm with Application to Passive Sonar |
15 Apr 2011 |
76 pages |
| Authors:
Sunil Mathews; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| This research investigates the use of two versions of a batch-oriented, multidimensional assignment tracking algorithm to examine target crossings that are on the order of 100 scans in duration. The simulations use outputs in one dimension (bearings only) from a passive sonar line array. Linear programming relaxation is used to solve the assignment problem for an exhaustive set of measurement-to-track N-tuple costs along the batch. The implementation of the cost ... |
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| The Strength of PIN-PMN-PT Single Crystals under Bending with a Longitudinal Electric Field |
06 APR 2011 |
9 pages |
| Authors:
P. Zhao; S. Goljahi; W. Dong; T. Wu; P. Finkel; R. Sahul; K. Snook; J. Luo; W. Hackenberger; C. S. Lynch; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| The effect of an electric field on the bending behavior of [001] oriented and poled relaxor Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 (PIN-PMN-PT) single crystals was measured using a four point bending apparatus with a longitudinal electric field applied to the bar during bending. The surface finish and electric field amplitude were observed to affect the bending strength. Polished surfaces improve the tensile strength, while also polishing the edges resulted in a significantly larger increase ... |
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| The Relationship Among Oceanography, Prey Fields, and Beaked Whale Foraging Habitat in the Tongue of the Ocean |
Apr 2011 |
12 pages |
| Authors:
Elliott L Hazen; Douglas P St Nowacek; Louis Laurent; Patrick N Halpin; David J Moretti; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| Beaked whales, specifically Blainville's (Mesoplodon densirostris) and Cuvier's (Ziphius cavirostris), are known to feed in the Tongue of the Ocean, Bahamas. These whales can be reliably detected and often localized within the Atlantic Undersea Test and Evaluation Center (AUTEC) acoustic sensor system. The AUTEC range is a regularly spaced bottom mounted hydrophone array covering 350 sq nm providing a valuable network to record anthropogenic noise and marine mammal vocalizations. Assessments ... |
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| Beaked Whales Respond to Simulated and Actual Navy Sonar |
14 Mar 2011 |
17 pages |
| Authors:
Peter L Tyack; Walter M Zimmer; David Moretti; Brandon L Southall; Diane E Claridge; John W Durban; Christopher W Clark; Angela D'Amico; Nanvy DiMarzio; Susan Jarvis; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| Beaked whales have mass stranded during some naval sonar exercises, but the cause is unknown. They are difficult to sight but can reliably be detected by listening for echolocation clicks produced during deep foraging dives. Listening for these clicks, we documented Blainville's beaked whales, Mesoplodon densirostris, in a naval underwater range where sonars are in regular use near Andros Island, Bahamas. An array of bottom-mounted hydrophones can detect beaked whales ... |
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| System for Generating Coherent Single-Frequency Single Transverse Mode Light Pulses |
04 Mar 2011 |
17 pages |
| Authors:
Lee E Estes; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| A system is provided to generate coherent single-frequency and single transverse mode light pulses. A laser produces a linearly-polarized continuous wave beam defined by a single longitudinal and transverse mode. A first rotator processes the beam such that optical polarization is rotated during a first time period and not rotated during a second and third time period. A second rotator is operated during the first period to rotate optical polarization ... |
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| Flutter Instability of a Fluid-Conveying Fluid-Immersed Pipe Affixed to a Rigid Body |
Jan 2011 |
12 pages |
| Authors:
Aren Hellum; Ranjan Mukherjee; Andrew J Hull; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| A set of simplified boundary conditions for a flexible beam connected to a rigid body at one end and free at the other end is presented and applied to the case of a fluid-conveying, fluid-immersed pipe. These boundary conditions represent an analytically tractable approximation to those of a submersible which uses a combination of jet action and flutter instability induced tail motion to produce thrust. The boundary conditions are made ... |
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| Integrating an Intelligent Tutoring System for TAOs with Second Life |
Dec 2010 |
11 pages |
| Authors:
Jeremy Ludwig; Erik Sincoff; Emilio Remolina; Richard Stottler; ANH NGUYEN; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| The Tactical Action Officer on board a U.S. Navy Cruiser, Destroyer, or Frigate is responsible for the operation of the entire watch team manning the ship's command center. Responsibilities include tactical decision-making, console operation, communications, and oversight of a variety of watchstander responsibilities in air, surface, and subsurface warfare areas. In previous work the PORTS TAO ITS, an Intelligent Tutoring System (ITS) for the instruction of Tactical Action Officers (TAOs) ... |
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| Statistical-Mechanics-Inspired Optimization of Sensor Field Configuration for Detection of Mobile Targets (PREPRINT) |
Nov 2010 |
10 pages |
| Authors:
Kushal Mukherjee; Shalabh Gupta; Asok Ray; Thomas A Wettergren; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| This paper presents a statistical-mechanics-inspired procedure for optimization of the sensor field configuration to detect mobile targets. The key idea is to capture the low-dimensional behavior of the sensor field configurations across the Pareto front in a multiobjective scenario for optimal sensor deployment where the nondominated points are concentrated within a small region of the large-dimensional decision space. The sensor distribution is constructed using location-dependent energy-like functions and intensive temperature-like ... |
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| Compact Filter Design |
30 Sep 2010 |
21 pages |
| Authors:
Jeremy R O'Neal; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| An apparatus and method for signal detection in which a digital sample stream is fed round robin into a plurality of buffers, which are sequentially compared with a reference signal to determine a match. A processor determines the chronological order of the samples in each bit of each buffer, and directs a bitwise comparison between the signal in each buffer with the reference to determine a match, e.g., by correlation. ... |
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| Electroactive Polymers With Anti-Counterfeiting Feature |
28 Sep 2010 |
22 pages |
| Authors:
Thomas Ramotowski; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| The present invention provides a new class of currency and documentation that is secure against counterfeiting, and against accidental or deliberate mischaracterization. The documentation has one or more structures made of electrostrictive polymer, normally invisible to human observation under ambient conditions, applied to one or more locations of the documentation. The locations can be selected in predetermined positions relative to visible features present on the documentation. The electrostrictive polymer can ... |
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| A Method for Mitigating Spatial Aliasing |
24 Sep 2010 |
16 pages |
| Authors:
Mary H Johnson; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| The invention as disclosed is a method for mitigating spatial aliasing that takes advantage of the forward motion of towed array elements to overcome the frequency constraints imposed on beam forming by the spatial separation of the array elements. The method employs the motion of a towed array of hydrophones to generate at least one synthetic array element to compensate for spatial under sampling. |
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| Electrochemical Buoyancy Engine for Autonomous Undersea Platforms |
14 Sep 2010 |
15 pages |
| Authors:
Thomas S Ramotowski; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| An electrochemical engine for buoyancy is provided with the engine having a water-tight and gas-tight chamber containing a volume of seawater. The electrochemical buoyancy engine contributes electrons for reduction of hydrogen protons in the seawater using a sufficient voltage applied to an anode and a cathode disposed in the seawater. The generated hydrogen gas is held in the chamber to provide the desired buoyancy and can be vented to adjust ... |
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| A Broadband High Dynamic Range Digital Receiving System for Electromagnetic Signals |
26 Aug 2010 |
49 pages |
| Authors:
Donald H Steinbrecher; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| A method is provided for the design of a wide-band high dynamic-range electromagnetic signal receiving system. The method provides for receiving a plurality of analog signals, converting the plurality to a digital replica that can be processed to recover separate high-fidelity replicas of each individual signal in the received plurality. The method also provides increasing the signal dynamic range with a parallel architecture comprising p identical parallel analog-to-digital channels wherein ... |
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| Disposable Chemical Sensor and Wireless Communication Device |
26 Aug 2010 |
12 pages |
| Authors:
Charles P Amidon; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| A disposable sensor device for remote sensing of conditions such as temperature and dangerous gasses includes a bodydefining an enclosed chamber, a power source mounted in the chamber, an on-off switch mounted on and accessible from outside the body, a processor mounted in the chamber and powered by the power source, sensors mounted on the exterior of the body in communication with the processor and capable of detecting gasses and ... |
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| Osmotic Pressure Based Cavitation Suppression System |
19 Aug 2010 |
16 pages |
| Authors:
Anthony A Ruffa; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| An acoustic source for use in a saltwater environment includes a transducer for projecting acoustic energy. The transducer is positioned within a semi-permeable membrane. The volume around the transducer within the membrane is filled with water having a lower concentration of a solute such as salt. When positioned in the saltwater environment, an osmotic pressure is created within the membrane. This osmotic pressure acts to suppress cavitation such as that ... |
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| The Decibel Report: Acoustic Sound Measurement Modeling and the Effects of Sonar on Marine Mammals |
21 Jun 2010 |
85 pages |
| Authors:
Richard A Katz; Nicholas J Cipriano; David J Pearson; Steve R Dunkleberger; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| This report is an authoritative and comprehensive explanation of sound-level quantities, metrics, and sonar models; its purpose is to provide best available science to acoustics and marine biology subject matter experts, sonar and environmental planners, and policy decision-makers so they can be better informed of the terminology, usage, and practices undertaken for modeling underwater sound energy effects pertinent to U.S. Naval sonar operations and the marine habitat. |
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| Method for Improving Acoustic Impedance of Epoxy Resins |
21 Jun 2010 |
17 pages |
| Authors:
Thomas S Ramotowski; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| An epoxy and rubber microcomposite is formed by adding a carboxy-terminated or amine-terminated rubber component having a glass transition temperature less than zero degrees centigrade to a bisphenol A based epoxy resin component; heating the mixture to 150 degrees centigrade; cooling and curing with a suitable curing agent. A phase segregation occurs between the epoxy resin component and the rubber component to form discrete, spherical rubbery domains with the epoxy ... |
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| Characterization of Nonlinear Systems with Memory by Means of Volterra Expansions with Frequency Partitioning: Application to a Cicada Mating Call |
15 Jun 2010 |
58 pages |
| Authors:
Albert H Nuttall; Derke R Hughes; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| This report introduces several new concepts to achieve some alleviation of the curse of dimensionality in determining the higher order kernels in a Volterra expansion. These concepts include: partitioning of the frequency scale(s), the fundamental region of formation, the diagonal strips in the two dimensional frequency space, the second- and third-order basis functions, and filtering of the measured nonlinear output to the particular frequency band under investigation. The equations for ... |
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| The Backseat Control Architecture for Autonomous Robotic Vehicles: A Case Study with the Iver2 AUV |
Jun 2010 |
8 pages |
| Authors:
Donald P Eickstedt; Scott R Sideleau; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| In this paper, an innovative hybrid control architecture for real-time control of autonomous robotic vehicles is described as well as its implementation on a commercially available autonomous underwater vehicle (AUV). This architecture has two major components, a behavior-based intelligent autonomous controller and an interface to a classical dynamic controller that is responsible for real-time dynamic control of the vehicle given the decisions of the intelligent controller over the decision state ... |
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| Collaborative Search Planning for Multiple Vehicles in Nonhomogeneous Environments |
Jun 2010 |
7 pages |
| Authors:
Thomas A Wettergren; John G Baylog; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| The planning of search paths of multiple unmanned undersea vehicles is complicated by taking into consideration the effects that potential cross-vehicle collaboration may have on their performance. Such collaboration is expected to have the effects of increasing the quality and accuracy of search over that which is obtainable from independent search paths. These problems are important in the undersea domain, where limited communications and uncertain performance characterizations provide a challenge ... |
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| Diesel Engine With Air Boosted Turbocharger |
26 May 2010 |
24 pages |
| Authors:
Paul M Dunn; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| A booster mechanism is selectively connected to an exhaust turbine which consequently powers an intake air compressor. The booster mechanism applies additional power to the exhaust turbine in order to give the engine full or near full torque above idle revolutions per minute (RPM). In one embodiment, the booster mechanism comprises an air flask which contains pressurized air or another pressurized air source that can be utilized to provide a ... |
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| A Simulation Model for Setting Terms for Performance Based Contract Terms |
May 2010 |
44 pages |
| Authors:
Betty C Jester; James C Ferguson; Marie E Bussiere; Manbir Sodhi; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| This paper sets forth a model-based approach for selecting terms applicable to a heavyweight torpedoes (HWT) Performance Based Logistics (PBL) contract capable of addressing both near- and long-term support considerations over the torpedo life cycle. Several performance measures commonly used in PBL contracts are described, and a model is presented that is based on an availability metric. This metric is calculated using the number of times a required part is ... |
|
| Underwater Acoustic Waveguide |
26 Apr 2010 |
18 pages |
| Authors:
Anthony A Ruffa; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| A system and method for generating an underwater acoustic waveguide suitable for guiding acoustic energy between a source and a receiver to enable underwater communications. Electrolysis of water by electrically powered terminals continuously creates a bubble field having a volume fraction of less than 0.01% gas. The bubble field has a lower sound speed than the surrounding water, resulting in the bubble field acting as a waveguide to transmit sound ... |
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| Transition to Turbulence in the Separated Shear Layers of Yawed Circular Cylinders |
15 Apr 2010 |
12 pages |
| Authors:
Stephen A Jordan; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| Spatial and temporal resolution of transition to turbulence inside the free-shear layers of two yawed circular cylinders is the subject of the present investigation. These physics were resolved using the large-eddy simulation (LES) methodology. An O-type grid was implemented such that the spatial scales of the LES computation fully resolved the energy range physics of the shear layers at Reynolds number ReD = 8000 based on the cylinder diameter. The ... |
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| Crimp-Imbalanced Protective (CRIMP) Fabrics |
31 Mar 2010 |
86 pages |
| Authors:
Paul V Cavallaro; Ali M Sadegh; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| This report documents the research that was conducted to explore the unique concept of using crimp imbalance, which is a simple architectural modification achieved during the weaving process, as a potential mechanism to enhance fragmentation and ballistic protection levels of single-ply woven fabrics. It is shown in this report that crimp imbalance (1) can substantially influence the energy absorption levels of single-ply fabrics for select fragment simulating projectile velocities, friction ... |
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| Uniformly Distributed Lead Zirconate Titanate Strain Sensor |
09 Mar 2010 |
13 pages |
| Authors:
Derke Hughes; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| The invention as disclosed is a strain sensor that locates and quantifies the strain energy from a structure. The strain sensor has a lead zirconate titanate wafer with a circular shape such that the shape does not directionally restrict the signal of the sensor. |
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Reports by Corporate Author
