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Defense Technical Information Archive
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Half-symmetric model is used in AutoDyn to simulate Depth of Penetration (DoP) experiments on SiC tile with and without a gap supported by solid aluminum. Impacts of a .30cal AP M2 projectile over an impact velocity range 700 m/s to 1000 m/s are modeled using SPH elements. Model validation runs with monolithic SiC tiles are conducted based on the DoP experiments described in reference - ARL-TR-2219, 2000. Tile gap is found to increase the DoP as compared to monolithic tiles. The next step will...
Topics: DTIC Archive, DELAWARE UNIV NEWARK, *ARMOR, ALUMINUM, CERAMIC MATERIALS, COMPUTERIZED SIMULATION,...
Fundamental research was performed in support of the development of a new generation of wave prediction capability, which is call SNOW (simulation of nonlinear ocean wavefield), for the evolution of large-scale realistic ocean surface and internal wavefields using direct phase-resolved simulations. Large-scale phase-resolved SNOW simulations of nonlinear wavefield evolutions are obtained and used to quantify and understand nonlinear ocean wave statistics and rogue wave kinematics/dynamics and...
Topics: DTIC Archive, MASSACHUSETTS INST OF TECH CAMBRIDGE, *OCEAN WAVES, COMPUTERIZED SIMULATION, OCEAN...
Long-term Goals: The overarching goals of this project are to understand the role of sea ice-albedo feedback on sea ice predictability, to improve how sea ice-albedo is modeled and how sea ice predictions are initialized, and then to evaluate how these improvements influence inherent sea ice predictability. Objectives: The sources of errors in a model forecast are from initial conditions and the model itself. Both can be evaluated with observations and potentially improved. We will use...
Topics: DTIC Archive, WASHINGTON UNIV SEATTLE DEPT OF ATMOSPHERIC SCIENCES, *SEA ICE, ALBEDO, COMPUTERIZED...
The focal point of this thesis is the overall process of diffusion and adoption of technological innovations (computer-supported training simulations) within the military domain. The goal was to capture the positive and negative trends that appear to be the most significant toward the adoption process. The approach selected in this thesis was to execute a user study and collect a set of data points concerned with the users overall demographics, attitudes, expectations, knowledge,...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *COMPUTERIZED SIMULATION, DATA BASES,...
Although perhaps not so dramatic or newsworthy as chemical, biologic, radiologic, nuclear, or explosive attacks, intentionally set fires are identified security threats to federal buildings accessible to the public. The Department of Homeland Security Interagency Security Committee in 2010 adopted building construction standards that purport to give facility safety committees and building designers guidance on developing permanent countermeasures to 31 diverse threat scenarios described in the...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *BUILDINGS, ATTACK, COMPUTERIZED SIMULATION,...
Defense Technical Information Archive
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Half-symmetric model is used in AutoDyn to simulate Depth of Penetration (DoP) experiments on aluminum targets with ceramic facing with and without a gap between tiles. Impacts from a .30cal AP M2 projectile are modeled using SPH elements. Model validation runs were conducted based on the DoP experiments described in reference - ARL-TR-2219, 2000. Boundary conditions were modified in order to achieve better data agreement. Further analysis will be conducted to determine the effect of material...
Topics: DTIC Archive, DELAWARE UNIV NEWARK, *ARMOR, ALUMINUM, CERAMIC MATERIALS, COMPUTERIZED SIMULATION,...
Defense Technical Information Archive
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Modern air vehicles face increasing internal heat loads that must be appropriately understood in design and managed in operation. This paper examines one solution to creating more efficient and effective thermal management systems (TMSs): vapor cycle systems (VCSs). VCSs are increasingly being investigated by aerospace government and industry as a means to provide much greater efficiency in moving thermal energy from one physical location to another. In this work, we develop the Air Force...
Topics: DTIC Archive, ILLINOIS UNIV AT URBANA-CHAMPAIGN, *COOLING AND VENTILATING EQUIPMENT, AIRCRAFT,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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Topics: NASA Technical Reports Server (NTRS), SUPERCOMPUTERS, NASA PROGRAMS, COMPUTERIZED SIMULATION,...
Defense Technical Information Archive
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The purpose of this Idea Development award is to evaluate the additive benefits of automated feedback and eye tracking to standard (human-directed training) of driving skills for those who are diagnosed with high functioning autism and have a learner s permit. The goal for year 1, which began when funding arrived on Sept 30, 2012, was to secure and operationalize the software to provide automated feedback, and to recruit and train 20 drivers, 10 receiving standard training and 10 receiving...
Topics: DTIC Archive, VIRGINIA UNIV CHARLOTTESVILLE, *AUTOMATION, *COMPUTERIZED SIMULATION, *DEVELOPMENTAL...
Topics: DTIC Archive, MICHIGAN ENGINEERING SERVICES LLC ANN ARBOR MI, *BLAST, COMPUTERIZED SIMULATION,...
One of the most important missions all Navies have is to constantly and sufficiently monitor their area of responsibility. This task becomes more challenging when a surveillance system operates in a complex environment with high traffic of merchant and fishing vessels and the existence of many islands. Potential tactics that targets might use increase the difficulty of this task. Integrating Unmanned Aerial Vehicles (UAVs) into a surveillance system that consists of ground radars and surface...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *OCEAN SURVEILLANCE, *SURVEILLANCE DRONES,...
Defense Technical Information Archive
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In July 2011, the Advanced Vehicle Power and Technology (AVPT) Alliance was announced as a partnership between the U.S. Department of Energy (DOE) and the U.S. Department of Army (DA) to explore solutions for decreasing petroleum dependence, increasing fuel efficiency and enhancing the nation's energy security infrastructure. The AVPT Alliance examines areas of interest that could serve as common ground for collaboration between DA and DOE, including: advanced combustion engines, lightweight...
Topics: DTIC Archive, NATIONAL RENEWABLE ENERGY LAB GOLDEN CO, *ELECTRIC BATTERIES, COMPUTER AIDED DESIGN,...
We present efforts aimed at establishing a multiscale approach for simulating dislocations in aluminum gallium nitride ((Al)GaN) semiconductors. We performed quantum mechanical and classical molecular dynamics (MD) simulations to study the electronic and atomic structure of threading edge and screw dislocations in AlGaN, focusing on the structure of the dislocation core and the electrical activity of dislocations, and estimating dislocation velocities as a function of applied stress and...
Topics: DTIC Archive, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD, *ALUMINUM GALLIUM NITRIDES,...
Defense Technical Information Archive
by Defense Technical Information Center
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Long-term goals: Smoothed Particle Hydrodynamics (SPH) is a meshless numerical method that is being developed for the study of nearshore waves and other Navy needs. The Lagrangian nature of SPH allows the modeling of wave breaking, surf zones, ship waves, and wave-structure interaction, where the free surface becomes convoluted or splash occurs. Including these phenomena in a numerical model that is robust enough for Navy use: GPUSPH. Objectives: To improve the ability of the meshfree...
Topics: DTIC Archive, JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF CIVIL ENGINEERING, *HYDRODYNAMICS,...
Initiatives to reduce ship maintenance costs have not yet realized the normal cost-reduction learning curve improvements. One explanation is the lack of recommended technologies. Damen, a Dutch shipbuilding and service firm, has incorporated similar technologies and is developing others to improve its operations. This research collected data on Dutch ship maintenance operations and used it to build three types of computer simulation models of ship maintenance and technology adoption. Results...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *NAVAL VESSELS, ACQUISITION, COMPUTERIZED...
Defense Technical Information Archive
by Defense Technical Information Center
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Non-volatile, non-flammable and polymerizable ionic liquid (IL) electrolytes for high-performance dye sensitized solar cells (DSSCs) have been synthesized and characterized. These ILs serve as promising electrolytes for advanced dye sensitized solar cells (DSSCs). We have characterized the thermo-physical and electrochemical properties of these ILs for DSSC-specific applications. Computer simulations have been performed to understand the structural properties of the new...
Topics: DTIC Archive, CLARKSON UNIV POTSDAM NY, *SOLAR CELLS, *SOLID ELECTROLYTES, COMPUTERIZED SIMULATION,...
The ability to predict the likelihood of conflict between two states based primarily on extrinsic factors is an arduous task, particularly given the complicated nature of analysis required and the large number of input factors involved. However, the benefits that may be gained from such an evaluation could reveal valuable insights for a decision-maker if seemingly small factors exhibit a large impact on a state s prospect or ability to take action. A software model can be used to address the...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *COMPUTER PROGRAMS, *IMPACT PREDICTION, *IRAN,...
Over the course of typical survivability analyses for underbody blast events, a multitude of individual cases are examined where charge size, charge location relative to the vehicle, and vehicle clearance from the ground are varied, so as to arrive at a comprehensive assessment. While multi-physics computational tools have reduced the expense and difficulty of testing each loading case experimentally, these tools still often require significant execution and wall-clock times to perform the...
Topics: DTIC Archive, MICHIGAN ENGINEERING SERVICES LLC ANN ARBOR MI, *BLAST, COMPUTERIZED SIMULATION,...
Creo Parametric 2.0's Advanced Framework Extension (AFX, formerly known as EFX) is a powerful add-on that allows users to rapidly model frame structures with ease. This presentation will briefly demonstrate how these types of models can be created quickly using AFX, and how it can reduce modeling time through the use of library items. It will also describe how AFX can be installed, configured, and properly administered, including the use of standard and custom shape libraries, along with...
Topics: NASA Technical Reports Server (NTRS), SOFTWARE DEVELOPMENT TOOLS, COMPUTER AIDED DESIGN,...
Defense Technical Information Archive
by Defense Technical Information Center
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The density of stochastic simulation output provides more information on system performance than the mean alone. However, density estimation methods may require large sample sizes to achieve a certain accuracy or desired structural properties. A nonparametric estimation method based on exponential epi-splines has shown promise to overcome this difficulty by incorporating qualitative and quantitative information that reduces the space of possible density estimates substantially. Such soft...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OPERATIONS RESEARCH, *COMPUTERIZED...
This presentation will discuss methods to which ModelCheck can be implemented to not only improve model quality, but also satisfy both employees and management through different sets of quality checks. This approach allows a standard set of modeling practices to be upheld throughout a company, with minimal interaction required by the end user. The presenter will demonstrate how to create multiple ModelCheck standards, preventing users from evading the system, and how it can improve the quality...
Topics: NASA Technical Reports Server (NTRS), MODELS, COMPUTERIZED SIMULATION, PROCEDURES, QUALITY CONTROL,...
This document is the final report for the project entitled "Upgrades to the Probabilistic NAS Platform Air Traffic Simulation Software." This report consists of 17 sections which document the results of the several subtasks of this effort. The Probabilistic NAS Platform (PNP) is an air operations simulation platform developed and maintained by the Saab Sensis Corporation. The improvements made to the PNP simulation include the following: an airborne distributed separation assurance...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, AIR TRAFFIC, AIR TRAFFIC CONTROL,...
Defense Technical Information Archive
by Defense Technical Information Center
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Recent years have seen a large growth in research developed aimed at modeling the intricate social-cultural climate in which we operate. In particular, agent-based models have garnered considerable attention for their ability to simulate heterogeneous actors operating in complex environments. This paper introduces an agent-based insurgency model capable of simulating hundreds of thousands of agents with complex cognitions and behaviors. Unlike previous agent-based models of civil violence, this...
Topics: DTIC Archive, SPACE AND NAVAL WARFARE SYSTEMS CENTER NORTH CHARLESTON SC, *INSURGENCY, COMPUTERIZED...
Long-term Goals: The overarching goal of this project is to understand the impacts of climate change on Arctic sea ice related to the snow cover and to evaluate climate model projections of snow on Arctic sea ice. Objectives: 1) Evaluate the climatology of snow on Arctic sea ice among integrations submitted to the Fifth Coupled Model Intercomparison Project (CMIP5) that are evaluated for the Intergovernmental Panel on Climate Change Fifth Assessment. Compare models with observations from a snow...
Topics: DTIC Archive, WASHINGTON UNIV SEATTLE DEPT OF ATMOSPHERIC SCIENCES, *SEA ICE, ARCTIC OCEAN, CLIMATE...
U.S Navy submarines rarely become disabled. The first disablement and loss occurred in 1914 when leaking battery acid in USS F-4 corroded hull rivets that caused progressive flooding, chlorine off gassing, loss of depth control and eventual catastrophic hull failure. Then, after another accident in 1927 when the U.S. Submarine S-4 became disabled and was lost with all hands, rescue procedure planning, equipment and training have continuously been undergoing improvement. As a result, 12 years...
Topics: DTIC Archive, ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA, *STRESS(PHYSIOLOGY),...
When designing combat vessels, the traditional approach has been to configure weapons and other operational systems around the hull. Such thinking may have been rooted in the idea that hull design is the highest priority, since it can translate into a speedier and more seaworthy vessel, thereby allowing the vessel to reach its destination and complete its mission on a timelier basis. The traditional approach, however, has its shortcomings; once the ship is built, modifications to meet changing...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *COMBAT EFFECTIVENESS, *COMPUTERIZED...
Defense Technical Information Archive
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Computer simulation is a valuable tool for the research of physics. These simulations can be especially valuable when there is experimental data available that can be used to validate the model. The main objective of this thesis is to determine whether a computer simulation model can accurately depict the experimentally determined fluid flow for a channel with a series of unique individual constrictions. The experimental data are derived from a scaled-up model of coronary blood flow with...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *COMPUTERIZED SIMULATION, *FLUID FLOW, BLOOD...
Defense Technical Information Archive
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Thermionic electron guns are capable of operating at high average currents in a variety of vacuum electronic applications, including conventional microwave tubes, but have been replaced by laser photocathode injectors for most free-electron laser (FEL) applications. However, while laser photocathode guns are capable of providing the very high brightness beams required for short wavelength FELs, they provide an increased level of system complexity and do not extrapolate well to injectors for...
Topics: DTIC Archive, NAVAL RESEARCH LAB WASHINGTON DC BEAM PHYSICS BRANCH, *ELECTRON GUNS, COMPUTERIZED...
Defense Technical Information Archive
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A study conducted by Carpenter, O Brien, Hagerman and McCarl in 2011 estimates the economic impact of a foot and mouth disease (FMD) epidemic in the United States to be $2.3 $69.0 billion. We simulate an outbreak of FMD across central California using the InterSpread Plus simulation package. We use an experimental design that produces 102,400 epidemic simulation runs. Using the data from the simulations, we identify 16 critical disease and control parameters that have the greatest effect on the...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *COMPUTERIZED SIMULATION, *DISEASES, *FEET,...
This presentation will discuss the methodology behind Model Class Definition--the use of separate model assemblies of the same product, at different fidelities, driven by the same skeleton files. These fidelities can be used to convey only the detail that the end user needs, by allowing the end user to pick and choose between model classes for assembly creation. The usefulness of MPA for the Windchill Release Process will be demonstrated, along with its usefulness in minimizing CPU resources...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, ASSEMBLIES, USER REQUIREMENTS,...
Defense Technical Information Archive
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The research team at STTC has attempted to holistically address many of these challenges via a web-based tool; Executable Architecture Systems Engineering (EASE). EASE is a Systems Engineering tool that allows development and management of distributed simulation models throughout the M&S life cycle from identification of event objectives through cloud-based deployment. As a web-based application, EASE provides an easy to use interface to allow M&S users to more easily configure and...
Topics: DTIC Archive, MILITARY ACADEMY WEST POINT NY OPERATIONS RESEARCH CENTER, *COMPUTERIZED SIMULATION,...
Defense Technical Information Archive
by Defense Technical Information Center
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This project employs modeling and simulation analysis in an effort to assess various aspects of the Marine Aviation Logistics Support Program II (MALSP II) doctrine currently in development. MALSP II leverages recent innovations in information technology, logistics chain management, and continuous process improvement in order to improve logistical support to deployed Marine air assets. The model develop in this project is a Discrete Event Simulation, implemented in Java using the SimKit...
Topics: DTIC Archive, MARINE CORPS COMBAT DEVELOPMENT COMMAND QUANTICO VA OPERATIONS ANALYSIS DIV, *AIR...
It is of considerable interest to developers of military vehicles, in early phases of the concept design process as well as in Analysis of Alternatives (AoA), to quickly predict occupant injury risk due to under body blast loading. The most common occupant injuries in these extremely short duration events arise out of the very high vertical acceleration of vehicle due to its close proximity to hot high pressure gases from the blast. The primary objectives of this paper are to conduct an...
Topics: DTIC Archive, ESI US INC TROY MI, *BLAST LOADS, BLAST, COMPUTERIZED SIMULATION, MILITARY VEHICLES,...
PowderSim is a calculation tool that combines a discrete-element method (DEM) module, including calibrated interparticle-interaction relationships, with a mesh-free, continuum, SPH (smoothed-particle hydrodynamics) based module that utilizes enhanced, calibrated, constitutive models capable of mimicking both large deformations and the flow behavior of regolith simulants and lunar regolith under conditions anticipated during in situ resource utilization (ISRU) operations. The major innovation...
Topics: NASA Technical Reports Server (NTRS), COHESION, COMPUTERIZED SIMULATION, HYDRODYNAMICS,...
Simulations of the early evolution of induced unstable disturbances in a Mach 6 hypersonic boundary layer are presented for the purposes of validating a high-order discontinuous Galerkin Navier-Stokes simulation code. The simulations are modeled after experiments performed in the Boeing/AFOSR Mach-6 Quiet Tunnel at Purdue University. In these experiments, a forcing mechanism was employed to induce reproducible disturbances in a hypersonic boundary layer providing for the controlled study of the...
Topics: NASA Technical Reports Server (NTRS), HYPERSONIC BOUNDARY LAYER, TURBULENCE, GALERKIN METHOD,...
Defense Technical Information Archive
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Particulate migration is a concern in the transfer mechanics for photocathode assemblies in a superconducting RF environment. These issues have been successfully addressed during this project with the design of a dust free cathode transfer mechanism that can enhance the reliability of SRF electron guns. This design is compatible with ultra-high vacuum (UHV), ionizing radiation, cryogenic surfaces, and does not generate particles at the interface between the sample holder, the transfer arm, and...
Topics: DTIC Archive, WISCONSIN UNIV MADISON, *ELECTRON GUNS, CATHODES, COMPUTERIZED SIMULATION, IONIZING...
Defense Technical Information Archive
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Initiatives to reduce ship maintenance costs have not yet realized the normal cost-reduction learning curve improvements. One explanation is the lack of recommended technologies. Damen, a Dutch shipbuilding and service firm, has incorporated similar technologies and is developing others to improve its operations. This research collected data on Dutch ship maintenance operations and used it to build three types of computer simulation models of ship maintenance and technology adoption. Results...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLIC POLICY,...
The long-term goals of this project are to further the insight into the dynamics of submesoscale flow in the oceanic surface layer. Using the regional oceanic modeling system (ROMS) we aim to understand the impact of submesoscale processes on the mixing at small scales of tracers and the transfer of energy towards the dissipative scales of non-geostrophic turbulence. An advanced understanding of surface layer processes at these small scales is instrumental in interpreting remote and directly...
Topics: DTIC Archive, CALIFORNIA UNIV LOS ANGELES, *OCEAN MODELS, BOUNDARY LAYER, COMPUTERIZED SIMULATION,...
Physics-based numerical simulation codes are widely used in science and engineering to model complex systems that would be infeasible to study otherwise. While such codes may provide the highest- fidelity representation of system behavior, they are often so slow to run that insight into the system is limited. Trying to understand the effects of inputs on outputs by conducting an exhaustive grid-based sweep over the input parameter space is simply too time-consuming. An alternative approach...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, MACHINE LEARNING,...
Conceptual design is the most fluid phase of aircraft design. It is important to be able to perform large scale design space exploration of candidate concepts that can achieve the design intent to avoid more costly configuration changes in later stages of design. This also means that conceptual design is highly dependent on the disciplinary analysis tools to capture the underlying physics accurately. The required level of analysis fidelity can vary greatly depending on the application. Vehicle...
Topics: NASA Technical Reports Server (NTRS), DESIGN ANALYSIS, AIRCRAFT DESIGN, DESIGN OPTIMIZATION,...
NASA Network Resource and Training Site
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Updated information on the status of the UH-60A Airloads wind tunnel test data, including recent work performed by NASA.
Topics: NASA Technical Reports Server (NTRS), WIND TUNNEL TESTS, AERODYNAMIC LOADS, UH-60A HELICOPTER,...
Initiatives to reduce the cost of ship maintenance have not yet realized the normal cost-reduction learning curve improvements. One explanation is the lack of some of the technologies recommended by the developers of SHIPMAIN, an initiative designed to improve ship maintenance performance within the Navy by standardizing processes in order to take advantage of learning curve cost savings and other technologies. Two such recommended technologies are collaborative product lifecycle management...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLIC POLICY,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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While a great deal of effort goes into planning and executing successful mission operations, it is also important to consider the End of the Mission during the planning, design, and operations phases of any mission. Spacecraft and launch vehicles must be disposed of properly in order to limit the generation of orbital debris, and better preserve the orbital environment for all future missions. Figure 30-1 shows a 1990's projected growth of debris with and without the use of responsible disposal...
Topics: NASA Technical Reports Server (NTRS), SPACE MISSIONS, MISSION PLANNING, LOW EARTH ORBITS, SPACE...
In the past few years, modeling and simulation (M&S) engineers have made impressive strides in their ability to improve ground vehicle reliability and Soldier safety. Typically, live-fire testing and evaluation (LFT&E) focuses on the effects of underbody blasts on a stationary vehicle. A recent physics-based, computational study called Blast-on-the-Move conducted by a TARDEC team epitomizes the steady progress in M&S capabilities applicable to defense acquisition. In its effort to...
Topics: DTIC Archive, ARMY TANK AUTOMOTIVE RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI, *BLAST,...
Defense Technical Information Archive
by Defense Technical Information Center
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This report describes the development of a contamination droplet-distribution model generated from the output of the chemical and biological agent Vapor, Liquid, and Solid Tracking (VLSTRACK) computer model. VLSTRACK provides the approximate downwind hazard predictions, droplet distributions, and gross contamination levels for chemical agents and munitions of military interest. During this study, we also modeled generic standoff-detection systems using a point-scanning and imaging mode. We...
Topics: DTIC Archive, ARMY EDGEWOOD CHEMICAL BIOLOGICAL CENTER APG MD RESEARCH AND TECHNOLOGY DIR,...
Defense Technical Information Archive
by Defense Technical Information Center
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Many systems, such as acoustic noise and structural vibrations are distributed in space. The location of control actuators, and also the sensors, is a variable the design of a control system. It has been known for some time that controlled system performance depends on actuator location. However, selection of actuator/sensor locations has not previously been systematically addressed. A mechatronic approach where controller design is integrated with actuator location was used. This effort was...
Topics: DTIC Archive, WATERLOO UNIV (ONTARIO), *ACTUATORS, *CONTROL SYSTEMS, *OPTIMIZATION, ALGORITHMS,...
Defense Technical Information Archive
by Defense Technical Information Center
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This third-year final report describes results on the multiscale modeling of noncrystalline ceramics (glass) funded from the Director's Strategic Initiative (DSI) in support of the U.S. Army Research Laboratory's (ARL) Strategic Research Initiative. The long-term research goal of the program is to develop a concurrent multiscale computational finite element code for optimizing or enhancing the performance of various glasses against ballistic threats; the initial work focuses on pure...
Topics: DTIC Archive, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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RFI-SIM simulates the RFI environment to estimate the interference from terrestrial emitters into spacecraft, or vice versa. A high-fidelity simulation of the RFI environment has been developed by employing all antenna- related and radar system-related parameters of multiple emitters, as well as that of the desired spacecraft. In the simulation, the real-time analysis of the interference and its effects on error budgets of a desired radar system is taken into account. This provides a reliable...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, RADIO FREQUENCIES, SYSTEMS...
Defense Technical Information Archive
by Defense Technical Information Center
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The goal of the project was the development of a state of the art code suite in 1D-3D, based on the object-oriented paradigm pioneered in the XOOPIC code, supported in the previous decade by AFOSR. Advances planned included massively parallel computing capability, a programmable front-end for controlling the code using the Python language, and a back-end diagnostic and plotting package based on Python. Planned physical models included improved boundary conditions, including conformal boundary...
Topics: DTIC Archive, MICHIGAN STATE UNIV EAST LANSING DEPT OF ELECTRICAL AND COMPUTER ENGINEERING,...
Defense Technical Information Archive
by Defense Technical Information Center
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Technology and size constraints have limited the development of the end game mechanisms of today's modern military weapons. A smaller, more efficient means of powering these devices is needed, and explosive pulsed power devices could be that answer. While most prior research has been in the experimental field, there is a need for more theory-based research and a computer modeling capability. The objective of this research was to use experimental data collected by the US Army at Redstone Arsenal...
Topics: DTIC Archive, AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF...
Defense Technical Information Archive
by Defense Technical Information Center
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This report describes a Monte Carlo simulation of image point spread functions in an absorbing and scattering water environment. A parallel processing MATLAB software package that implements the simulation is presented.
Topics: DTIC Archive, NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI, *OCEANS, *OPTICS, *SOFTWARE TOOLS,...
A dual flow-path inlet for a turbine based combined cycle (TBCC) propulsion system is to be tested in order to evaluate methodologies for performing a controlled inlet mode transition. Prior to experimental testing, simulation models are used to test, debug, and validate potential control algorithms which are designed to maintain shock position during inlet disturbances. One simulation package being used for testing is the High Mach Transient Engine Cycle Code simulation, known as HiTECC. This...
Topics: NASA Technical Reports Server (NTRS), FEEDBACK CONTROL, PROPULSION, COMPUTERIZED SIMULATION, ENGINE...
Within the first few seconds after launch of STS-124, debris traveling vertically near the vehicle was captured on two 16-mm film cameras surrounding the launch pad. One particular piece of debris caught the attention of engineers investigating the release of the flame trench fire bricks. The question to be answered was if the debris was a fire brick, and if it represented the first bricks that were ejected from the flame trench wall, or was the object one of the pieces of debris normally...
Topics: NASA Technical Reports Server (NTRS), DEBRIS, ESTIMATING, LAUNCHING, PHOTOGRAMMETRY, RUNGE-KUTTA...
The threat of degradation or disruption from cyber infiltration, espionage, and theft to militarily and nationally critical information and network systems poses a significant challenge to DoD and DON. To mitigate this challenge, network administrators must be trained to properly recognize and defend against malicious activity. The Malicious Activity Simulation Tool (MAST), a software program under development at NPS, mimics the behavior and impact of network-based malware in an effort to train...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *COMPUTER NETWORK SECURITY, *HACKING(COMPUTER...
Defense Technical Information Archive
by Defense Technical Information Center
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The goal of the ESME Workbench project is to create a general purpose simulation tool for use by those who wish to study the effects of sound in the marine environment. The major objectives of the project are to: 1) Develop a sophisticated user interface that allows the user to visualize the environmental parameters used for acoustic propagation calculations as well as the results of these calculations and then to visualize the location of sound sources and animals during scenario simulations....
Topics: DTIC Archive, BOSTON UNIV MA HEARING RESEARCH CENTER, *COMPUTER PROGRAMS, *COMPUTERIZED SIMULATION,...
Defense Technical Information Archive
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Cumulative fatigue damage is known to be the leading cause of aircraft structural and engine failure. At the present time, reliable methods for prediction of fatigue crack initiation are not available, because the phenomenon starts at the atomic scale. Initiation of fatigue cracks is associated with the formation of persistent slip bands, which form inside metals with specific microstructure dimensions.
Topics: DTIC Archive, CALIFORNIA UNIV LOS ANGELES DEPT OF MECHANICAL AND AEROSPACE ENGINEERING, *CRACKS,...
A high fidelity simulation using a PC based Trick framework has been developed for Johnson Space Center's Morpheus test bed flight vehicle. There is an iterative development loop of refining and testing the hardware, refining the software, comparing the software simulation to hardware performance and adjusting either or both the hardware and the simulation to extract the best performance from the hardware as well as the most realistic representation of the hardware from the software. A Particle...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, OPTIMIZATION, TEST STANDS, AUTOMATIC...
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The objective of this thesis is to evaluate a modeling and simulation tool for the analysis of the Trident II D5 missile nose fairing to determine the limitations of serviceability through the extended service life of the D5 missile. The benefit of this analysis is a means to evaluate and manage the remaining nose fairing supply and serve as a baseline for future production of nose fairings. Constructed of a Sitka spruce and fiberglass laminate, the nose fairing is designed as the lifting point...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *LIFE CYCLES, *NOSES, *SUBMARINES,...
Defense Technical Information Archive
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Computer simulations are commonly used in the laboratory to support, facilitate, or optimize the experimental process. We present the use of two different software packages, COMSOL and LiveAtom, and explain how they assist us through the experimental procedure. Both programs perform finite element analysis to solve partial differential equations. COMSOL is a multiphysics simulation software that is very powerful and particularly useful for solving and visualizing physical problems. LiveAtom was...
Topics: DTIC Archive, ARMY RESEARCH LAB ADELPHI MD, *ATOMS, *COMPUTERIZED SIMULATION, CHIPS(ELECTRONICS),...
This paper explores low-cost hardware and software methods to provide depth cues traditionally absent in monocular displays. The use of a VRPN server in conjunction with a Microsoft Kinect and/or Nintendo Wiimote to provide head tracking information to a Unity application, and NVIDIA 3D Vision for retinal disparity support, is discussed. Methods are suggested to implement this technology with NASA's EDGE simulation graphics package, along with potential caveats. Finally, future applications of...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, DISPLAY DEVICES, MICROGRAVITY,...
'Debris disks' around young stars (analogues of the Kuiper Belt in our Solar System) show a variety of non-trivial structures attributed to planetary perturbations and used to constrain the properties of those planets. However, these analyses have largely ignored the fact that some debris disks are found to contain small quantities of gas, a component that all such disks should contain at some level. Several debris disks have been measured with a dust-to-gas ratio of about unity, at which the...
Topics: NASA Technical Reports Server (NTRS), DEBRIS, COSMIC DUST, STELLAR ENVELOPES, COMPUTERIZED...
The test program developing parachutes for the Orion/MPCV includes drop tests with parachutes deployed from an Orion-like parachute compartment at a wide range of dynamic pressures. Aircraft and altitude constraints precluded the use of an Orion boilerplate capsule for several test points. Therefore, a dart-shaped test vehicle with a hi-fidelity mock-up of the Orion parachute compartment has been developed. The available aircraft options imposed constraints on the test vehicle development and...
Topics: NASA Technical Reports Server (NTRS), DEPLOYMENT, DROP TESTS, PARACHUTES, TEST VEHICLES, CREW...
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The goal of this project is to learn about the software development process, specifically the process to test and fix components of the software. The paper will cover the techniques of testing code, and the benefits of using one style of testing over another. It will also discuss the overall software design and development lifecycle, and how code testing plays an integral role in it. Coding is notorious for always needing to be debugged due to coding errors or faulty program design. Writing...
Topics: NASA Technical Reports Server (NTRS), SOFTWARE ENGINEERING, COMPUTER PROGRAMS, COMPUTERIZED...
Storm Sandy first appeared as a tropical storm in the southern Caribbean Sea on Oct. 22, 2012, moved northeastward, turned northwestward, and made landfall near Brigantine, New Jersey in late October. Sandy devastated surrounding areas, caused an estimated damage of $50 billion, and became the second costliest tropical cyclone (TC) in U.S. History surpassed only by Hurricane Katrina (2005). To save lives and mitigate economic damage, a central question to be addressed is to what extent the lead...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, HURRICANES, CLIMATOLOGY,...
Defense Technical Information Archive
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The research team composed of Arkema, Lion Apparel and University of Cincinnati (UC) successfully identified new barrier materials that exceed current technology for protective garments. These materials are novel semi-permeable membranes (SPMs) based on an amphiphilic block copolymers (BCPs) blended in a high-strength host polymer. This innovation was enabled by Arkema's Blocbuilder controlled radical BCP polymerization technology, which generates tailored polymer architectures. The water...
Topics: DTIC Archive, ARKEMA INC PHILADELPHIA PA, *BIOLOGICAL WARFARE AGENTS, *CHEMICAL WARFARE AGENTS,...
This aerospace medicine clerkship project is under the direction of Dr. Sharmila Watkins and is in cooperation with Dr. Eric Kerstman and Dr. Ronak Shah. The questions of the research project are: 1. What are the main drivers of evacuation and loss of crew life (LOCL) on three Design Reference Missions (DRMs): Near Earth Asteroid (NEA), Lunar Sortie and Lunar Outpost using an inexhaustible International Space Station medical kit 2. What are the treatment designations for these driving medical...
Topics: NASA Technical Reports Server (NTRS), AEROSPACE MEDICINE, SPACECREWS, COMPUTERIZED SIMULATION,...
Integrated simulation capabilities that are high-fidelity, fast, and have scalable architecture are essential to support autonomous vehicle design and performance assessment for the U.S. Army's growing use of unmanned ground vehicles (UGV). The HMMWV simulation described in this paper embodies key features of the real vehicle, including a complex suspension and steering dynamics, wheel-soil models, navigation, and control. This research uses advanced multibody techniques such as minimal...
Topics: DTIC Archive, CALIFORNIA INST OF TECHNOLOGY PASADENA JET PROPULSION LAB, *GROUND VEHICLES,...
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ROBoT is an on-orbit version of the ground-based Dynamics Skills Trainer (DST) that astronauts use for training on a frequent basis. This software consists of two primary software groups. The first series of components is responsible for displaying the graphical scenes. The remaining components are responsible for simulating the Mobile Servicing System (MSS), the Japanese Experiment Module Remote Manipulator System (JEMRMS), and the H-II Transfer Vehicle (HTV) Free Flyer Robotics Operations....
Topics: NASA Technical Reports Server (NTRS), ASTRONAUT TRAINING, COMPUTERIZED SIMULATION, ROBOTICS, REMOTE...
Defense Technical Information Archive
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The last decade witnessed a manifest shift in the microprocessor industry towards chip designs that promote parallel computing. Until recently the privilege of a select group of large research centers, Teraflop computing is becoming a commodity owing to inexpensive GPU cards and multi to many-core x86 processors. This paradigm shift towards large scale parallel computing has been leveraged in Chrono, a freely available C++ multi-physics simulation package. Chrono is made up of a collection of...
Topics: DTIC Archive, WISCONSIN UNIV-MADISON DEPT OF MECHANICAL ENGINEERING, *COMPUTERIZED SIMULATION,...
A dual flow-path inlet system is being tested to evaluate methodologies for a Turbine Based Combined Cycle (TBCC) propulsion system to perform a controlled inlet mode transition. Prior to experimental testing, simulation models are used to test, debug, and validate potential control algorithms. One simulation package being used for testing is the High Mach Transient Engine Cycle Code simulation, known as HiTECC. This paper discusses the closed loop control system, which utilizes a shock...
Topics: NASA Technical Reports Server (NTRS), INLET FLOW, CONTROLLERS, FEEDBACK CONTROL, COMPUTERIZED...
On August 5, 2012, the Mars Science Laboratory rover, Curiosity, successfully landed inside Gale Crater. This landing was only the seventh successful landing and fourth rover to be delivered to Mars. Weighing nearly one metric ton, Curiosity is the largest and most complex rover ever sent to investigate another planet. Safely landing such a large payload required an innovative Entry, Descent, and Landing system, which included the first guided entry at Mars, the largest supersonic parachute...
Topics: NASA Technical Reports Server (NTRS), MARS SCIENCE LABORATORY, CURIOSITY ROVER, DESCENT, LANDING...
A novel predictive model for accurately determining filtrate mass correlation with respect with the input variables. The solution is based on training a neural network consisting of ten hidden layers using the Levenberg-Marcquard back propagation algorithm to recognize the correlation between the input variables, including the filtration time, and the filtrate mass. The main hurdle found was how to exactly organize the data in order to get the best Mean Square Error (MSE) and correlation (R)...
Topics: DTIC Archive, ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ,...
Defense Technical Information Archive
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Computer simulations facilitate the study of real-world phenomena by providing safe, controlled, flexible, and repeatable experimental environments at costs far lower than other options. Both the validity of the simulation model and the scope of its validity determine the degree to which the findings can be generalized and applied to real-world situations and problems. In practice, no single model captures all of the important aspects of a phenomena of interest, nor is it applicable over a wide...
Topics: DTIC Archive, DEFENCE RESEARCH AND DEVELOPMENT CANADA VALCARTIER (QUEBEC), *COMMAND AND CONTROL...
The Application Programming Interface (API) for the Crew Exploration Vehicle (CEV) Aerodynamic Database has been developed to provide the developers of software an easily implemented, fully self-contained method of accessing the CEV Aerodynamic Database for use in their analysis and simulation tools. The API is programmed in C and provides a series of functions to interact with the database, such as initialization, selecting various options, and calculating the aerodynamic data. No special...
Topics: NASA Technical Reports Server (NTRS), AERODYNAMICS, COMPUTERIZED SIMULATION, APPLICATION...
Performance increases in turbojet engines can theoretically be achieved through Mass Injection Pre-Compressor Cooling (MIPCC), a process involving injecting water or oxidizer or both into an afterburning turbojet engine. The injection of water results in pre-compressor cooling, allowing the propulsion system to operate at high altitudes and Mach numbers. In this way, a MIPCC-enhanced turbojet engine could be used to power the first stage of a reusable launch vehicle or be integrated into an...
Topics: NASA Technical Reports Server (NTRS), REUSABLE LAUNCH VEHICLES, F-15 AIRCRAFT, F-4 AIRCRAFT,...
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Topics: NASA Technical Reports Server (NTRS), APOLLO SPACECRAFT, ANALYSIS (MATHEMATICS), CONICAL NOZZLES,...
This thesis is focused on the development of a six degrees of freedom (6DOF) simulation model of a commercial-off-the-shelf quadrotor. The dynamics of the quadrotor and its control strategy are described. The Geometric Dilution of Precision (GDOP) of the Autonomous Systems Engineering and Integration Laboratory (ASEIL) laboratory used in conducting the experiments is also analyzed. Simulation results are then verified with actual flight data. A direct method of calculus of variations is...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *DRONES, *VIRTUAL REALITY, ATTITUDE CONTROL...
Topics: DTIC Archive, CALIFORNIA INST OF TECHNOLOGY PASADENA JET PROPULSION LAB, *GROUND VEHICLES,...
Defense Technical Information Archive
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The ADFStealthViewer User Manual details how to install, configure and use the ADFStealthViewer software. The software is based on an open source simulation and gaming engine stealth viewer application. Stealth viewers enable users to view a simulation event as a passive 'stealth' observer. The stealth viewer displays simulation entities with a 3D model representation in a 3D virtual world. The software allows basic features such as the ability to fly anywhere and look anywhere; configure...
Topics: DTIC Archive, DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) MARITIME OPERATIONS...
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This report discusses a program that was written in order to support the FragFly model. The program assists users of the FragFly model in visualizing and posing a human target composed of moveable parts. The report discusses the architectural design of the posing program and identifies the specific format for constructing input files. The report also provides a user s guide for a graphical user interface that was created.
Topics: DTIC Archive, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD, *COMPUTERIZED SIMULATION, *GRAPHICAL...
Defense Technical Information Archive
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The use of simulation technology, in conjunction with instructor led rules of the road (RoR) lectures, is in the infancy stages of curriculum development in maritime institutions. As a result, there are few studies that analyze whether using simulators will increase a student s ability to apply maritime rules that prevent collisions at sea in a simulation based scenario. This study hypothesized that students who used a Full Mission Bridge simulator and received lectures would achieve higher...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA MODELING VIRTUAL ENVIRONMENTS AND SIMULATION...
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The Crew Exploration Vehicle Parachute Assembly System (CPAS) is the parachute system for NASA s Orion spacecraft. The test program consists of numerous drop tests, wherein a test article rigged with parachutes is extracted or released from an aircraft. During such tests, range safety is paramount, as is the recoverability of the parachutes and test article. It is crucial to establish an aircraft release point that will ensure that the article and all items released from it will land in safe...
Topics: NASA Technical Reports Server (NTRS), PARACHUTES, RECOVERABILITY, DROP TESTS, FOOTPRINTS, IMPACT...
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This paper describes the application of the Jack human figure model to the analysis of vehicle egress by military personnel following an accident. In post-accident situations, the vehicle attitude may preclude egress by the normal methods that have been addressed in most previous research. For this analysis, the Human Motion Simulation Framework reference implementation was used to aid the simulation. With the current level of functionality, only basic clearance issues could be investigated;...
Topics: DTIC Archive, ARMY TANK AUTOMOTIVE RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI, *EXITS,...
Defense Technical Information Archive
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The Automated Neuropsychological Assessment Metrics - Version 4 (ANAM4) has been used as a predeployment tool to help evaluate the cognitive effects of TBI in the military. Whereas there is support for ANAM4 s validity, little is known about what constitutes normal performance on ANAM4 among cultural/ethnic minority populations, despite their disproportionate representation in the military, the risk of TBI and PTSD during deployment, and the fact that demographic/cultural factors are known to...
Topics: DTIC Archive, TEXAS UNIV AT DALLAS SOUTHWESTERN MEDICAL CENTER, *COGNITION, *TRAUMATIC BRAIN...
Defense Technical Information Archive
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The long-term goal is to develop a nonhydrostatic, parallel ocean simulation tool that is capable of simulating processes on a wide range of scales through use of accurate numerical methods and highperformance computational algorithms. The tool will be applied to study highly nonlinear internal waves in coastal domains to develop an improved understanding of mechanisms that govern their generation, propagation, and dissipation.
Topics: DTIC Archive, STANFORD UNIV CA DEPT OF CIVIL AND ENVIRONMENTAL ENGINEERING, *ALGORITHMS, *OCEAN...
This year we continue our partnership between Delaware State University and University of Pennsylvania. We finalized ACRIN data transfer on MIRC and resolved issues with various batch transfers. We performed a preliminary query of the ACRIN data aimed at identifying the prevalence of women with incomplete visualization of the breast. We developed a code to estimate the breast cancer risks using the demographic metadata information from the ACRIN cases. We estimated breast densities for GE...
Topics: DTIC Archive, DELAWARE STATE UNIV DOVER, *BREAST CANCER, *MAMMOGRAPHY, *MINORITIES, ALGORITHMS,...
The objective of this research was to develop a fundamentally new method for detecting hidden moving targets within noisy and cluttered data-streams using a novel "soliton resonance" effect in nonlinear dynamical systems. The technique uses an inhomogeneous Korteweg de Vries (KdV) equation containing moving-target information. Solution of the KdV equation will describe a soliton propagating with the same kinematic characteristics as the target. The approach uses the time-dependent...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, MOVING TARGET INDICATORS, TARGET...
Due to the severity of forces exerted during an IED blast, ground vehicles undergo multiple sub-events including local structural deformation of the floor, blast-off, free flight and slam-down (including roll-over). The entire blast event from blast-off to slam-down may last as long as 2 seconds in duration depending on several parameters such as vehicle weight, charge size and location. Simulation of the entire blast event is computationally intensive due to the high fidelity levels of the...
Topics: DTIC Archive, ARMY TANK AUTOMOTIVE RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI, *BLAST,...
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This report covers work done in preparation for open field blast testing of swine and post-mortem human subjects as well as the development of computer models simulating the response of the swine and human brain to blast. Equipment required to perform these tests have been ordered and with the exception of the intracranial pressure transducers, all other equipment has been received and tested. The manufacturer of the pressure transducers promised delivery of the equipment in late August 2013...
Topics: DTIC Archive, WAYNE STATE UNIV DETROIT MI, *BLAST, *WOUNDS AND INJURIES, AXONS, BRAIN, COMPUTERIZED...
In this study, we discuss the performance of the parallel ensemble empirical mode decomposition (EMD) in the analysis of tropical waves that are associated with tropical cyclone (TC) formation. To efficiently analyze high-resolution, global, multiple-dimensional data sets, we first implement multilevel parallelism into the ensemble EMD (EEMD) and obtain a parallel speedup of 720 using 200 eight-core processors. We then apply the parallel EEMD (PEEMD) to extract the intrinsic mode functions...
Topics: NASA Technical Reports Server (NTRS), CYCLONES, TROPICAL STORMS, CYCLOGENESIS, TROPICAL...
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Topics include: Single-Photon-Sensitive HgCdTe Avalanche Photodiode Detector; Surface-Enhanced Raman Scattering Using Silica Whispering-Gallery Mode Resonators; 3D Hail Size Distribution Interpolation/Extrapolation Algorithm; Color-Changing Sensors for Detecting the Presence of Hypergolic Fuels; Artificial Intelligence Software for Assessing Postural Stability; Transformers: Shape-Changing Space Systems Built with Robotic Textiles; Fibrillar Adhesive for Climbing Robots; Using Pre-Melted Phase...
Topics: NASA Technical Reports Server (NTRS), AEROSPACE SYSTEMS, DETECTION, IMAGING TECHNIQUES,...
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In 2001, NASA released a new approach to computational fluid dynamics that allows users to perform automated analysis on complex vehicle designs. In 2010, Palo Alto, California-based Desktop Aeronautics acquired a license from Ames Research Center to sell the technology. Today, the product assists organizations in the design of subsonic aircraft, space planes, spacecraft, and high speed commercial jets.
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT DESIGN, COMPUTATIONAL FLUID DYNAMICS, COMPUTERIZED...
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The Spaceport Command and Control System (SCCS) Simulation Computer Software Configuration Item (CSCI) is,. responsible for providing simulations to support test and verification of SCCS hardware and software. The Universal Coolant Transporter System (UCTS) is a Space Shuttle Orbiter support piece of the Ground Servicing Equipment (GSE). The purpose of the UCTS is to provide two support services to the Space Shuttle Orbiter immediately after landing at the Shuttle Landing Facility. The...
Topics: NASA Technical Reports Server (NTRS), SPACE SHUTTLE ORBITERS, COMMAND AND CONTROL, COMPUTER...
Our research is focused upon new methods to support decision making for the acquisition of system of systems (SoS). We have improved upon prior work by introducing both an extension to the previously developed Computational Exploratory Model (CEM) and a decision-analysis framework that addresses issues of identifying optimal collections of interconnected systems. An Agent-Based Model (ABM) approach extends prior CEM capabilities by enabling the development of a simulation to model...
Topics: DTIC Archive, PURDUE UNIV LAFAYETTE IN SCHOOL OF AERONAUTICS AND ASTRONAUTICS, *COMPUTERIZED...
Defense Technical Information Archive
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The NATO Network Enabled Operations (NEC) C2 Maturity Model (N2C2M2) defines a number of Command and Control (C2) Approaches that correspond to various ways to accomplish C2 functions. These Approaches are defined by the allocation of decision rights, patterns of interaction, and the distribution of information. Recent work in C2 theory has considered the differences in performance relative to the C2 Approach that is adopted. This work investigates the idea that an optimal operating region of...
Topics: DTIC Archive, ARMY RESEARCH LAB ADELPHI MD COMPUTATIONAL AND INFORMATION SCIENCES DIRECTORATE,...
OpticalRabi oscillations are coherent population oscillations of a two - level system coupled by an electric dipole transition when driven by a strong nearly resonant optical field. In quantum dot structures, these measurements have typically been performed as a function of the total pulse area function of ohm(0)(t)(dt) where the pulse area varies as a function of Rabi frequency. Here, we report direct detection of the time - resolved coherent transient response of the resonance fluorescence to...
Topics: DTIC Archive, MICHIGAN UNIV ANN ARBOR, *QUANTUM COMPUTING, COMPUTERIZED SIMULATION,...
Defense Technical Information Archive
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Defense acquisition is characterized by significant levels of risk throughout the life cycle. Risk, of course, may result in undesirable outcomes. Deriving from many sources, both technical and organizational, risk is inherently a socio-technical phenomenon in enterprises such as acquisition. As such, it is difficult to address. At the same time, fiscal pressures are causing decreased funding and increased expectations for acquisition performance. This points to the importance of risk...
Topics: DTIC Archive, GEORGIA INST OF TECH ATLANTA TENNENBAUM INST FOR ENTERPRISE TRANSFORMATION,...
Computer games are increasingly being used by armed forces to supplement traditional methods of military training, despite a lack of empirical evidence on their training effectiveness. This report describes a study conducted by DSTO scientists that examined the effectiveness of a desktop computer game to train small teams of dismounted soldiers in infantry attack tactics, techniques, and procedures (TTPs). Two infantry sections took part in the study and were allocated to either game-based or...
Topics: DTIC Archive, DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) LAND OPERATIONS...
A CFD analysis is performed to model the catalytic jump in surface heating rates measured as part of the Space Shuttle Boundary Layer Transition (BLT) flight experiment.
Topics: NASA Technical Reports Server (NTRS), COMPUTATIONAL FLUID DYNAMICS, SIMULATION, BOUNDARY LAYER...
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Topics: NASA Technical Reports Server (NTRS), RAIN, DROPS (LIQUIDS), ICE FORMATION, AIRCRAFT ICING,...