| MURI Center for Photonic Quantum Information Systems |
16-Oct-2009 |
26 pages |
| Authors:
Paul Kwiat; Jelena Vuckovic; STANFORD UNIV CA
|
 | We have continued the development of several photonic quantum technologies: single-photon and entangled-photon sources from quantum dots and parametric down-conversion; solid-state quantum gates based on quantum dots in semiconductors and on NV centers in diamond; quantum memories using optical storage systems; and high-efficiency single-photon detectors, using optimized visible light photon counters, superconducting bolometers, and frequency upconverters (to be able to detect telecommunication wavelengths using superior visible-wavelength detectors). For most of ... |
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| Numerical Study of Effects of Fluid-Structure Interaction on Dynamic Responses of Composite Plates |
Sep-2009 |
115 pages |
| Authors:
Peter K Kendall; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Composite materials are seeing increased use in structural applications because of their various benefits. When composite structures are employed in a water environment, their dynamic responses are greatly affected by the fluid medium. Water density is comparable to many composite materials and the effects of fluid-structure interaction on dynamic behaviors of composite structures are significant. The effects of fluid-structure interaction include changes of frequency, magnitude, energy dissipation, etc., of structural ... |
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| Finite Element Analyses and Experimental Testing of Hybrid Composite/Metal Joints Subjected to Fully Reversed Flexure Fatigue Loading |
30-Aug-2009 |
173 pages |
| Authors:
Vincent Caccese; Douglas Dow; Senthil S Vel; MAINE UNIV AT ORONO DEPT OF MECHANICAL ENGINEERING
|
| The goal in this research is to accurately assess the fatigue life of hybrid composite/metal connections focusing upon bolted joints used in removable panels. Experimental testing was performed in flexure fatigue as part of this effort and is essential for fatigue life evaluation. In addition, analytical studies were performed using finite element analysis. Existing finite element modeling software offers a robust method for assessing the structural integrity of proposed hybrid ... |
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| Microchannel Heat Sink with Micro Encapsulated Phase Change Material (MEPCM) Slurry |
31-May-2009 |
83 pages |
| Authors:
Louis Chow; Jian-hua Du; Amit Gupta; Krishna Kota; Ranganathan Kumar; Sarada Kuravi; UNIVERSITY OF CENTRAL FLORIDA ORLANDO OFFICE OF RESEARCH AND COMMERCIALIZATION
|
| High heat flux removal from devices such as Insulated-Gate Bipolar Transistor (IGBT) and Monolithic Microwave Integrated Circuit (MMIC) will be important for future Navy ships. Micro encapsulated phase change material (MEPCM) slurry was used as a heat transfer fluid inside a microchannel instead single phase fluid. Presence of phase change material increases the effective heat capacity of the fluid. The performance of encapsulated phase change material (EPCM) slurry flow in ... |
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| Forecasting Marine Corps Enlisted Attrition Through Parametric Modeling |
Mar-2009 |
85 pages |
| Authors:
Jeremy T Hall; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Marine Corps, as with any organization with a large workforce, must accurately monitor and more importantly predict the transition rates among personnel entering and exiting the enlisted and officer ranks. This emphasis is even more appropriate given that the Marine Corps has been authorized to increase the current authorized end strength by 13,000 personnel from Fiscal Year 2008 to Fiscal Year 2010. The purpose of this thesis is to ... |
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| Research in Evaluation Methods for Data Fusion-Capable Tactical Platforms and Distributed Multi-platform Systems in Electronic Warfare and Information-Warfare Related Missions |
Feb-2009 |
124 pages |
| Authors:
James Llinas; Christopher Bowman; Kedar Sambhoos; STATE UNIV OF NEW YORK AT BUFFALO CENTER FOR MULTISOURCE INFORMATION FUSION
|
| We have shown that the design of a PE process for any multi-sensor or multi-aircraft fusion based system involves the design of a separate data fusion process involving association and estimation functions for PE purposes per se. Our publications to date have developed the theoretical and architectural groundings for this new PE process, and several case studies have been carried out to show sample implementations of the principles of this ... |
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| Structural Analysis and Optimization of the Support Device Used for a Proximal Fracture of the Femur |
Dec-2008 |
103 pages |
| Authors:
Richard A Smith; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The support system for a proximal fracture of the femur is studied by means of the finite element method. The support system of the Gamma III by Stryker is used for this study due to the versatility and simplicity of the system. The variance of each system was modeled to validate the results. Parametric studies between the models were conducted and design improvements were then tested against the existing parameters. ... |
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| Density as a Cost-driver in Naval Submarine Design and Procurement |
25-Jun-2008 |
96 pages |
| Authors:
Benjamin P Grant; NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLIC POLICY
|
| This thesis examines density reduction as an alternative to weight or size reduction when decision-makers seek options for lower-cost submarine designs. The parameter density measures how tightly systems and equipment are placed within a hull structure. To address design characteristics unique to submarines, this research mainly focuses on submarine design and procurement although the general concepts are applicable to surface ship designs and may be applied more broadly. Based on ... |
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| A Wide Area Bipolar Cascade Resonant Cavity Light Emitting Diode for a Hybrid Range-Intensity Sensor |
19 JUN 2008 |
195 pages |
| Authors:
Reginald J. Turner; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This dissertation focused on the development of an illuminator for the HRIS. This illuminator enables faster image rendering and reduces the potential of errors in return signal data, that could be generated from extremely rough terrain. Four major achievements resulted from this work, which advance the field of 3-D image acquisition. The first is that the TJ is an effective current spreading layer for LEDs with mesa width up to ... |
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| Density as a Cost Driver in Naval Submarine Design and Procurement |
01-Jun-2008 |
98 pages |
| Authors:
Benjamin P Grant; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis examines density reduction as an alternative to weight or size reduction when decision makers seek options for lower-cost submarine designs. The parameter density measures how tightly systems and equipment are placed within a hull structure. To address design characteristics unique to submarines, this research focuses mainly on submarine design and procurement although the general concepts are applicable to surface ship designs and may be applied more broadly. Based ... |
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| Automated Influence Network Generation and the Node Parameter Sensitivity Analysis |
01-Jun-2008 |
34 pages |
| Authors:
Il-Chul Moon; Kathleen M Carley; Eunice J Kim; CARNEGIE-MELLON UNIV PITTSBURGH PA
|
| An influence network is a directed graph extensively used for Effects-Based Operation. It contains nodes that represent events and links that encode causal relationships among events. It propagates the likelihood of each event through promotion or inhibition by its parents. As a subject matter expert often builds this network by hand, we helped simplify the influence network generation in Organization Risk Analyzer. The resulting influence network is generated from a ... |
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| Analysis of Field Design Considerations for the Operation of Undersea Sensor Networks |
Jun-2008 |
15 pages |
| Authors:
Thomas A Wettergren; Russell Costa; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| A Distributed Sensing Problem: Problem: Determine the proper sizing of sensor fields to obtain tradeoffs between multi-sensor detection and multi-sensor false alarm performance as a function of the anticipated target characteristics. Approach: Build analytical parametric models of system performance as a function of: - (uncertain) target characteristics, - (uncertain) sensor characteristics - (uncertain) environmental characteristics Then exercise the models to examine the effects of various deployment considerations on both detection ... |
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| Ultrasonically Absorptive Coatings for Hypersonic |
13-May-2008 |
|
| Authors:
David Marshall; Alexander Fedorov; Norman D Malmuth; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
|
 | Laminar flow control (LFC) technologies reduce heat-transfer rates as well as the weight and complexity of thermal protection system (TPS). The laminar run can be substantially increased using an ultrasonically absorptive coating (UAC). The project is focused on maturing of the UAC-LFC methodology. Key components of the effort include wind-tunnel experiments, theoretical analysis, direct numerical simulation, fabrication and testing of ceramic materials that integrate UAC and TPS functions. To aid ... |
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| Parametric Study on the Interior Ballistics of 105 and 155 mm Artillery Guns |
MAR 2008 |
|
| Authors:
Vincent Tanguay; DEFENCE RESEARCH AND DEVELOPMENT CANADA VALCARTIER (QUEBEC)
|
| The interior ballistics code IBHVG2 was used to calculate the muzzle velocity and peak acceleration of projectiles ranging in mass from 10 to 50 kg. The simulations were performed with both 105 and 155 mm guns. These were the C3 and LG1 (105 mm and 52-calibre M777 were also considered. Three propellants were investigated: the triple base M31, and two composite propellants, JA2 and the developmental propellant LCT. For ever ... |
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| Constitutive Models for Nonlinear Finite Element Analysis of Masonry Prisms and Infill Walls |
Mar-2008 |
71 pages |
| Authors:
Ghassan L Al-Chaar; Armin Mehrabi; ENGINEER RESEARCH AND DEVELOPMENT CENTER CHAMPAIGN IL CONSTRUCTION ENGINEERING RESEARCH LAB
|
| After much previous research, many controversial issues related to well developed design recommendations and well accepted analytical procedures for infilled frames are still unresolved. The main difficulty in evaluating the performance of bearing and shear wall structures is determining the type of interaction between the infill and the frame, which has a major impact on the structural behavior and load-resisting mechanism. A simplified model that captures the characteristics of infill ... |
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| Process Time Refinement for Reusable Launch Vehicle Regeneration Modeling |
MAR 2008 |
188 pages |
| Authors:
Joseph A. Servidio; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF SYSTEMS AND ENGINEERING MANAGEMENT
|
| To sustain operational effectiveness, the Air Force has invested in the research and development of space-based technologies. Certain ongoing spacelift research efforts are focused on developing operationally responsive Reusable Military Launch Vehicles (RMLV) capable of launching payloads into orbit within hours of a tasking notification. Previous Air Force Research Laboratory-sponsored AFIT studies have resulted in the development of the MILEPOST discrete-event simulation model. This model has enabled the ability to ... |
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| Reusable Military Launch Systems (RMLS) |
FEB 2008 |
107 pages |
| Authors:
Gregory E. Moster; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
|
| The Air Force Research Laboratory (AFRL) has developed a design environment (IPAT) and approaches to assess the performance and operational capabilities of reusable launch systems in collaboration with the NASA and industry. This approach uses the AML design environment with parametric geometry modeling. This approach has been used successfully and resulted in the Rocket Boost-Back concept under development by AFRL and SMC under the FAST ground experiment program. The RMLS ... |
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| Collaborative Platform for DFM |
20 DEC 2007 |
219 pages |
| Authors:
Wojciech J. Poppe; CALIFORNIA UNIV BERKELEY DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| This dissertation addresses the two biggest challenges in Design for Manufacturing (DFM), how to inject process variations into design and how to identify and quantitatively characterize the main sources of transistor performance variation so that the information that is fed into design is accurate enough to make design tradeoff decisions effectively. To address these challenges the Collaborative Platform for DFM has been built in three main parts; the Parametric Yield ... |
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| Summary of Recent Hybrid Torpedo Powerplant Studies |
01-Dec-2007 |
54 pages |
| Authors:
Jonathan A Peters; PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
|
| Hybrid torpedoes incorporate multiple propulsion subsystems, optimized for different power levels. This allows these weapons to operate more efficiently over a wide range of speeds, which may give tactical advantages in certain engagement scenarios. After a brief general discussion of the hybrid torpedo concept, a parametric analysis comparing hybrid and conventional torpedo ranges is presented. The distinctions between hybrid torpedoes and weaponized Unmanned Undersea Vehicles (UUVs) are enumerated. Powerplant component ... |
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| Aircraft Downwind Hazard Distance After a Chemical Attack |
08 MAY 2007 |
104 pages |
| Authors:
Richard E. McNally; Claudia SPita; SCIENCE APPLICATIONS INTERNATIONAL CORP (SAIC) ALEXANDRIA VA
|
| This report describes the development of a rule for the standoff distance from a chemical warfare contaminated aircraft for the Air Force counter-chemical warfare concept of operations (C-CW CONOPS). The 10-foot rule that was originally developed in the C-CW CONOPS described the precautionary procedures used to safely approach a painted, chemically-contaminated vehicle surface at varied times after the chemical warfare agent (CWA) attack. In order to make the 10-foot rule ... |
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| Spectral Analysis of Polarimetric Weather Radar Data With Multiple Processes in a Resolution Volume |
Apr-2007 |
5 pages |
| Authors:
Svetlana Bachmann; Victor DeBrunner; Dusan Zrnic; Mark Yeary; COOPERATIVE INST FOR MESOSCALE METEOROLOGICAL STUDIES NORMAN OK
|
| A new approach for the clear air velocity estimation in weather radar is presented. A combination of nonparametric with parametric spectral analyses allows us to identify and extract multiple processes caused by different scatterer types within a single radar resolution volume. An example of clear air observed using an S-band dual polarization radar is presented. Heretofore, migrating birds and wind-blown insects that are mixed within each resolution volume caused such ... |
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| Change-Point Methods for Overdispersed Count Data |
MAR 2007 |
111 pages |
| Authors:
Brian A. Wilken; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| A control chart is often used to detect a change in a process. Following a control chart signal, knowledge of the time and magnitude of the change would simplify the search for and identification of the assignable cause. In this research, emphasis is placed on count processes where overdispersion has occurred. Overdispersion is common in practice and occurs when the observed variance is larger than the theoretical variance of the ... |
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| Approved Methods and Algorithms for DoD Risk-Based Explosives Siting |
02 FEB 2007 |
321 pages |
| Authors:
Meredith J. Harwick; John Hall; John W. Tatom; Robert G. Baker; APT RESEARCH INC HUNTSVILLE AL
|
| The Safety Assessment for Explosives Risk (SAFER) model was developed to provide a more comprehensive assessment of the overall risk associated with explosives operations and storage. The SAFER model calculates risk in terms of the statistical expectation for loss of life from an explosives event. Three components are multiplied to estimate annual maximum probability of fatality, P(f), and the expected fatalities, E(f): (1) the probability of an explosives event, P(e), ... |
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| User's Reference Model Safety Assessment for Explosives Risk (SAFER) Risk Analysis Software |
02 FEB 2007 |
117 pages |
| Authors:
Meredith J. Harwick; Nina Donath; John W. Tatom; APT RESEARCH INC HUNTSVILLE AL
|
| The Safety Assessment for Explosives Risk (SAFER) model was developed to provide a more comprehensive assessment of the overall risk associated with explosives operations and storage. This evaluation involves determining the required Quantity-Distance separation distance based on the relationship between the Potential Explosion Site (PES)/Exposed Site (ES) pair, type of operations (or storage) being conducted in each facility, and the type and quantity of explosives involved. Acceptability is based on ... |
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| Applied Stochastic Eigen-Analysis |
FEB 2007 |
|
| Authors:
Rajesh R. Nadakuditi; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| The first part of the dissertation investigates the application of the theory of large random matrices to high-dimensional inference problems when the samples are drawn from a multivariate normal distribution. A longstanding problem in sensor array processing is addressed by designing an estimator for the number of signals in white noise that dramatically outperforms that proposed by Wax and IKailath. This methodology is extended to develop new parametric techniques for ... |
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| Nonhydrostatic Numerical Investigations of Oscillating Flow over Sills: Generation of Internal Tides and Solitary Waves |
25 JAN 2007 |
3 pages |
| Authors:
Shenn-Yu Chao; MARYLAND UNIV CAMBRIDGE CENTER FOR ENVIRONMENTAL SCIENCE
|
| The goal of this project is to identify processes relevant to the finite-amplitude, internal solitary waves observed in the region from the Luzon Strait to the Chinese continental shelf in support of ONR's Nonlinear Internal Waves Initiative (NLIW). A nonhydrostatic numerical model was adapted to study these waves. Wave generation by a ridge, propagation in the deep basin, and reflection and diffraction by an island were successfully simulated by the ... |
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| Parametric Study of Beta-Endpoint Energy in Direct Energy Converters |
JAN 2007 |
62 pages |
| Authors:
Kara Blaine; Marc Litz; ARMY RESEARCH LAB ADELPHI MD
|
| Several solid-state materials have been identified for potential use as direct-energy-converter (DEC) for isotope-based batteries. Numerical simulations, using a nuclear scattering code (MCNPX), have been performed to determine the electron energy deposited in the material. Two different parametric studies were performed 1) varying Beta-endpoint energy of a spectrum illuminating layers of silicon-carbide (SiC), 2) the other varying the material layers while keeping the Beta-endpoint energy constant. The goal of the ... |
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| An Improvement to the Fourier Series Method for Inversion of Laplace Transforms Applied to Elastic and Viscoelastic Waves |
JAN 2007 |
24 pages |
| Authors:
Richard R. Laverty; George A. Gazonas; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| A parametric study of composite strips leads to systems of partial differential equations, coupled through interface conditions, that are naturally solved in Laplace transform space. Because of the complexity of the solutions in transform space and the potential variations due to geometry and materials, a systematic approach to inversion is necessarily numerical. The Dubner-Abate-Crump (DAC) algorithm is the standard in such problems and is implemented. The presence of discontinuous wavefronts ... |
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| Parametric Reduced-Order Models for Probabilistic Analysis of Unsteady Aerodynamic Applications |
2007 |
16 pages |
| Authors:
T. Bui-Thanh; K. Wilcox; O. Ghattas; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF AERONAUTICS AND ASTRONAUTICS
|
| Methodology is presented to derive reduced-order models for large-scale parametric applications in unsteady aerodynamics. The specific case considered in this paper is a computational fluid dynamic (CFD) model with parametric dependence that arises from geometric shape variations. The first key contribution of the methodology is the derivation of a linearized model that permits the effects of geometry variations to be represented with an explicit affine function. The second key contribution ... |
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| Characterization and Detection of Delamination in Smart Composite Structures |
31 DEC 2006 |
50 pages |
| Authors:
Hsin-Piao Chen; Aditi Chattopadhyay; CALIFORNIA STATE UNIV LONG BEACH
|
| A multidisciplinary procedure has been developed for damage diagnosis or interrogation based on the concept of analyzing temporal relations between values of critical variables. Some observable variable of the system is traced through time from a specific initial state. The dynamics of the degradation process can be described by a time-variant mathematical model of this relationship. A novel neural-network-based approach to damage diagnosis and prognosis for nonlinear dynamic systems has ... |
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| Nonhydrostatic Numerical Investigations of Oscillating Flow over Sills: Generation of Internal Tides and Solitary Waves |
20 DEC 2006 |
3 pages |
| Authors:
Ping T. Shaw; NORTH CAROLINA STATE UNIV AT RALEIGH
|
| The goal of this project is to identify processes relevant to the finite-amplitude, internal solitary waves observed in the region from the Luzon Strait to the Chinese continental shelf in support of ONR's Nonlinear Internal Waves Initiative (NLIWI). A nonhydrostatic numerical model was adapted to study these waves. Wave generation by a ridge, propagation in the deep basin, and reflection and diffraction by an island were successfully simulated by the ... |
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| Parametric Dynamic Load Prediction of a Narrow Gauge Rocket Sled |
DEC 2006 |
261 pages |
| Authors:
John S. Furlow; NEW MEXICO STATE UNIV LAS CRUCES
|
| Dynamic load prediction of rocket sleds has been of interest to sled designers and analysts since the inception of the Holloman High Speed Test Track, (HHSTT). Dynamic loading along with thrust and aerodynamic loading is a primary contributor to sled design load cases. Dynamic loading comes directly from the rocket sled traversing the gap between the slipper and rail and the resulting sliding impacts. The current study investigates the prediction ... |
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| Flight Regime Recognition Analysis for the Army UH-60A IMDS Usage |
DEC 2006 |
127 pages |
| Authors:
Ahmet M. Dere; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Usage Monitoring requires accurate regime recognition. For each regime, there is a usage assigned for each component. For example, the damage accumulated at a component is higher if the aircraft is undergoing a high G maneuver than in level flight. The objective of this research is to establish regime recognition models using classification algorithms. The data used in the analysis are the parametric data collected by the onboard system and ... |
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| Ablation Loss Studies for Capillary - Sustained Plasmas |
NOV 2006 |
18 pages |
| Authors:
Anthony W. Williams; Richard A. Beyer; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| The most common discharge geometry used for efficiently generating plasma from stored electrical energy for gun ignition utilizes a capillary tube to contain, direct, and sustain the discharge. The plasma gas composition is determined by the air in the tube before discharge begins and by materials removed from the capillary tube wall, electrodes, and exploding wire used to start the event. The conductivity of the plasma in the capillary affects ... |
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| Mathematical Modeling of Rail Gun |
SEP 2006 |
99 pages |
| Authors:
Nikolaos Pratikakis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The exit velocity of the launch object along with the values of electric and thermal conductivity at the interfaces between the rails and the armature of a rail gun are critical issues. This thesis, using finite element method, estimates the former by solving the proper multiphysics governing equations along with exploiting the contact theory between flat surfaces. A parametric analysis in the vicinity of the standard deviation of the normalized ... |
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| Stochastic Resonance in Signal Detection and Human Perception |
05 JUL 2006 |
|
| Authors:
James H. Michels; Hao Chen; Pramod K. Varshney; Steven M. Kay; JHM TECHNOLOGIES ITHACA NEW YORK
|
| Stochastic Resonance (SR) is a nonlinear phenomenon first reported in terms of a nonlinear dynamic effect. The important question of what type of noise to be added has until recently evaded a solution. This issue is addressed directly and a fundamental theoretical framework is developed leading to a determination of the optima! additive SR noise to achieve maximum probability of detection subject to the constraint that the probability of false ... |
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| Incident Boundary Conditions for Wave Transformation |
2006 |
13 pages |
| Authors:
Jane M. Smith; Mark B. Gravens; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
|
| The nearshore wave transformation model STWAVE is used to transform hindcast wave time histories to the shore to estimate longshore sediment transport rates. These transport rates are used to evaluate engineering design of beach fills and coastal shore protection structures. The boundary conditions used to force STWAVE are typically derived from the Wave Information Studies (WIS) wind-wave hindcast database. In the past, only bulk wave parameters (height, period, and direction) ... |
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| Ablation Study in a Capillary Sustained Discharge |
2006 |
11 pages |
| Authors:
Michael Keidar; Iain D. Boyd; Anthony Williams; Richard Beyer; MICHIGAN UNIV ANN ARBOR DEPT OF AEROSPACE ENGINEERING
|
| Electrothermal-chemical (ETC) ignition systems have been demonstrated in gun systems to provide desirable characteristics including reproducible shorter ignition delays. The optimum combination of capillary tube and fuse wire properties has not been identified yet. We present a combined theoretical and experimental study of the capillary discharge with an aim to develop a capillary plasma source with efficient energy conversion. The major emphasis in the present capillary discharge model is the ... |
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| Coordination Control for Haptic and Teleoperator Systems |
2006 |
23 pages |
| Authors:
E. Tatlicioglu; M. McIntyre; D. Dawson; T. Burg; CLEMSON UNIV SC DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| In this paper, two controllers are developed for nonlinear haptic and teleoperator systems for coordination of the master and slave systems. The first controller is proven to yield a semi-global asymptotic result in the presence of parametric uncertainty in the master and the slave dynamic models provided the user and the environmental input forces are measurable. The second controller yields a global asymptotic result despite unmeasurable user and environmental input ... |
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| Parametric Study of the Towline Shape of an Aircraft Decoy |
19 OCT 2005 |
80 pages |
| Authors:
Tyler L. Richardson; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Some of today's aircraft use decoys as a defense against enemy weapons. The decoy is towed behind the aircraft with the intention of attracting the weapon propagator by deception, trying to mislead the weapon into detecting it instead of the aircraft. An aircraft deploys a decoy via a towline extending out behind and below the aircraft. However, during some maneuvers, the towline moves up into the jet exhaust plume of ... |
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| Bulk Growth and Characterization of Quaternary I-III-VI2 |
OCT 2005 |
8 pages |
| Authors:
Arnold Burger; FISK UNIV NASHVILLE TN DEPT OF PHYSICS
|
| Bulk chalcopyrites are essential materials for any second harmonic generation (SHG) or optical parametric oscillation (OPO) applications. These materials are from a class that has been described as the `keystone" for future systems and which will provide a defense for aircraft against heat seeking missiles, a significant threat. Additional these materials may have applications in systems that can detect chemical and biological warfare agents via remote spectroscopy of the atmosphere. ... |
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| Computational Fluid Dynamics Study for Optimization of a Fin Design |
28 SEP 2005 |
16 pages |
| Authors:
Ravi Ramamurti; William C. Sandberg; NAVAL RESEARCH LAB WASHINGTON DC
|
| The three-dimensional, unsteady computations of an Unmanned Underwater vehicle with flapping fins were carried out. Several parametric studies were performed varying the amplitude and frequency of oscillation of the fin and the angle of attack of the fin at the root. The objective of these computations was to investigate the importance of these parameters on the fluid dynamics of force production in order to propel the vehicle at a constant ... |
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| A Solution of the Alekseevski-Tate Penetration Equations |
SEP 2005 |
50 pages |
| Authors:
William Walters; Cyril Williams; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| The Alekseevski-Tate equations have been used for five decades to predict the penetration, penetration velocity, rod velocity, and rod length of long-rod penetrators and similar projectiles. These nonlinear equations were originally solved numerically and more recently by the exact analytical solution of Walters and Segletes. However, due to the nonlinear nature of the equations, penetration was obtained implicitly as a function of time. The current report obtains the velocities, length, ... |
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| Endgame Analyses Against a Ballistic Missile a Parametric Study |
JUL 2005 |
|
| Authors:
P. W. Doup; M. Sc; TNO DEFENSE SECURITY AND SAFETY RIJSWIJK (NETHERLANDS)
|
| A comparative lethality study between fragmentation warheads and hit-to-kill(HTK) interceptors against ballistic missiles has been conducted. First a sensitivity analysis was performed to determine the influence of some critical parameters for the two lethality mechanisms. Next, a set of intercept geometries was chosen , for which the lethality of fragmentation warheads and HTK- interceptors were compared against a ballistic missile, containing sub-munitions filled with chemical agents. The fraction of killed ... |
|
| The Salvo Equations: Test and Applications |
23 JUN 2005 |
23 pages |
| Authors:
Jr Hughes Wayne P.; NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF OPERATIONAL AND INFORMATION SCIENCES
|
| Presentation on "The Salvo Equations: Tests and Applications." Order of presentation is: The Salvo Equations; Value of Analytical Models; V & V [&A?]; Recent Contributions to Understanding; Recent Influence. |
|
| Civil Position, Navigation, and Timing Analysis of Alternatives |
21 JUN 2005 |
33 pages |
| Authors:
Richard Bloser; Jeff Dubois; GENERAL DYNAMICS ADVANCED INFORMATION SYSTEMS COLORADO SPRINGS CO
|
| PURPOSE: Provide an overview of the Civil Position, Navigation, and Timing Analysis of Alternatives conducted for the IGEB. This presentation will discuss the analysis methods used, scenario analysis, and some of the challenges encountered in applying a military style AoA to an analysis conducted within the civil community. |
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| Dynamic Influence Nets: An Extension of Timed Influence Nets for Modeling Dynamic Uncertain Situations |
JUN 2005 |
34 pages |
| Authors:
Sajjad Haider; Alexander H. Levis; GEORGE MASON UNIV FAIRFAX VA SYSTEMS ARCHITECTURE LAB
|
| This paper proposes structural and parametric enhancements in the Timed Influence Nets (TINs) based framework for modeling Effects-Based Operations (EBO). The existing TIN framework does not have the capability to model the impact of different sequences of actions. Thus, no matter what the sequence of action is, the final outcome remains the same. Furthermore, it is assumed that the influence of an event on another event is stationary, i.e., the ... |
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| Characterization of a Rotary Flat Tail as a Spoiler and Parametric Analysis of Improving Directional Stability in a Portable UAV |
MAY 2005 |
125 pages |
| Authors:
Troy A. Leveron; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The United States Air Force Research Lab, Munitions Directorate, Flight Vehicles, Integration Branch (AFRL/MNAV), has developed a flexible wing micro air vehicle (MAV) to be used with special tactics groups. In keeping with the requirement that this MAV be compact, previous research developed a rotatable tail mechanism which resulted in tail movement similar to that of a bird's tail. In this study the design of this tail was modified to ... |
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| Modeling and Analysis of Clandestine Networks |
MAR 2005 |
226 pages |
| Authors:
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Since Sept. 11, 2001, there has been great interest in the military and intelligence communities in using Social Network Analysis (SNA) to support the disruption and destruction of global terrorist networks. SNA results, however, tend to be descriptive and are limited due to the lack of advantageous properties of the relationship measures applied to the arcs in a social network. Further, SNA techniques generally focus on a single network context ... |
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| Technical Feasibility of Loitering Lighter-Than-Air Near-Space Maneuvering Vehicles |
MAR 2005 |
98 pages |
| Authors:
Eric R. Moomey; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS
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| The near-space region of earth's atmosphere above 20 kilometers altitude is greatly underutilized. Lighter-than-air maneuvering vehicles, or airships, using the principle of buoyancy can take advantage of this region to become potential platforms for precision navigation, environmental monitoring, communication relays, missile warning, surveillance, and weapon delivery. These vehicles purportedly provide persistent coverage over large areas of the earth's surface at substantially lower costs than orbiting satellites. This study investigated the ... |
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