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In 2013, Naval Air Systems Command (NAVAIR) at the Naval Air Station, Patuxent River, Maryland initiated a research task (RT-48) to assess the technical feasibility of creating/leveraging a more holistic Model-Based Systems Engineering (MBSE) approach to support Mission-based Analysis and Engineering in order to achieve a 25% reduction in development time from that of the traditional large-scale weapon systems. The research need included the evaluation of emerging system design through computer...
Topics: DTIC Archive, SYSTEMS ENGINEERING RESEARCH CENTER HOBOKEN NJ, *SYSTEMS ENGINEERING, COMPUTERIZED...
The scientific and technical objectives of our research in this project include: * Directly capture the generation and evolution of Langmuir cells in simulations; quantify the statistics of Langmuir turbulence. * Investigate the onset of wave breaking; quantify wave breaking intensity and model the resultant injection of turbulence to upper-ocean; study wave breaking effect on Langmuir cells. * Develop physics based wind force modeling for oceanic flows; investigate the impact of spatial and...
Topics: DTIC Archive, MINNESOTA UNIV MINNEAPOLIS DEPT OF MECHANICAL ENGINEERING, *OCEAN WAVES, COMPUTERIZED...
Defense Technical Information Archive
by Defense Technical Information Center
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This is the final report for the activities conducted at the University of Maryland during participation in the Collaborative Center in Multidisciplinary Sciences (CCMS) project. In this work, the investigators have primarily explored the suitability of computational tools to predict desirable micro-air-vehicle (MAV) designs. The use of computationally expensive high-fidelity tools such as direct numerical simulation is compared to that of moderate fidelity tools, such as the inexpensive...
Topics: DTIC Archive, MARYLAND UNIV COLLEGE PARK, *DRONES, AIRCRAFT DESIGN, COMPUTERIZED SIMULATION
NASA engineers use simulation software to detect and prevent interference between different radio frequency (RF) systems on a rocket and satellite before launch. To speed up the process, Kennedy Space Center awarded SBIR funding to Champaign, Illinois-based Delcross Technologies LLC, which added a drag-and-drop feature to its commercial simulation software, resulting in less time spent preparing for the analysis.
Topics: NASA Technical Reports Server (NTRS), ARTIFICIAL SATELLITES, LAUNCHING, RADIO FREQUENCIES,...
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 2, which began when funding arrived on Sept 30, 2013, was to examine the effects of eye-tracking feedback on training. This was accomplished by integrating the eye-tracking component with the standard training. To date...
Topics: DTIC Archive, IOWA UNIV IOWA CITY, *EYE MOVEMENTS, *TRACKING, *VIRTUAL REALITY, COMPUTERIZED...
Defense Technical Information Archive
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This paper describes a multi-resolution, distributed design and simulation software for rapid prototyping and analysis of complex systems using a Co-simulation approach. The current focus of this work is on the modeling of the engine cooling system in the Ford Escape Hybrid SUV vehicle. In that particular vehicle the cooling system consists of three coupled subsystems: a) engine cooling; b) electronic transaxle cooling; and battery cooling. This paper discusses two aspects of this work: a) high...
Topics: DTIC Archive, COMPUTATIONAL SCIENCES LLC MADISON AL, *COOLING, COMPUTERIZED SIMULATION, ENGINES,...
Defense Technical Information Archive
by Defense Technical Information Center
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This paper will present a validation of the turbulence modeling approaches used in the Helios code. Helios is a dual-mesh overset unstructured/Cartesian RANS solver developed by the US Army for high-fidelity simulation of rotorcraft aeromechanics. The paper will present validations of standard 3D flowfields using the current near-body unstructured code NSU3D as well as the new strand mesh solver that is intended to be adopted over the next few years.
Topics: DTIC Archive, UTAH STATE UNIV LOGAN, *COMPUTATIONAL FLUID DYNAMICS, COMPUTERIZED SIMULATION, FLOW...
Defense Technical Information Archive
by Defense Technical Information Center
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The objective of the proposed research is to deliver enhanced mesh adaptation capabilities that account for the chaotic unsteady nature of the flowfield in the landing approach path. The research will explore three distinct meshing methods to handle the dynamic aspect of this case. The three methods include a hierarchical Cartesian hexahedral method, an all-tetrahedral mesh method and a physics-based point placement meshless method. The initial phase of the research will develop pseudo-steady...
Topics: DTIC Archive, TENNESSEE UNIV CHATTANOOGA, *CARRIER LANDINGS, *FLOW FIELDS, COMPUTERIZED SIMULATION,...
Defense Technical Information Archive
by Defense Technical Information Center
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As the United States Navy makes leaps forward in technology that is being deployed onboard ships, there is a growing need for research to predict what will be needed to integrate new weapon systems with old. Directed energy weapons are being deployed onboard naval platforms starting in 2014, and this paper seeks to answer the question of what energy storage, if any, must be used in conjunction with high-power lasers in order to integrate them with current ships in the fleet. Four energy storage...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *DIRECTED ENERGY WEAPONS, *ENERGY STORAGE,...
It is a well known fact that underbody blasts have become one of the most widespread reasons for warfighter casualties in recent wars. -Spinal injuries to occupants have particularly increased in theater from these roadside blast incidents, followed by tibia and lower leg injuries. 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. It is of...
Topics: DTIC Archive, ESI US INC TROY MI, *BLAST LOADS, CASUALTIES, COMPUTERIZED SIMULATION, MILITARY...
Defense Technical Information Archive
by Defense Technical Information Center
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New classes of stochastic models for network systems having stochastically dependent components are studied by a combination of probabilistic analysis and efficient simulation techniques. For instance, in a model in which shocks of r different types occur, with component i failing when there have been a total of n(i) type i shocks, we give a method for studying the distribution of the the number of shocks needed to cause the system to fail.
Topics: DTIC Archive, UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES, *OPTIMIZATION, *STOCHASTIC PROCESSES,...
Analysis of the various transient quantities contained in an ALEGRA simulation, including material properties, scalar variables, and tensor variables, can be an arduous task. In particular, the extraction of specific time-dependent quantities traveling through an Eulerian mesh is time consuming. This report documents an automated method of extracting transient quantities that vary spatially from an ALEGRA simulation using a VisIt macro written in the Python programming language. Plots of data...
Topics: DTIC Archive, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH...
The current state-of-the-art munitions development by the United States Air Force creates potential exposure scenarios wherein soldiers and laboratory workers may inhale nano-phase aerosols. The primary metals of present interest in this study are aluminum, boron, tantalum, titanium, and tungsten. The contained work describes efforts made to develop a software package capable of analyzing, and predicting, bioassay measurements of workers and soldiers following exposures to the metallic...
Topics: DTIC Archive, FLORIDA UNIV GAINESVILLE DEPT OF BIOMEDICAL ENGINEERING, *AEROSOLS, BIOASSAY,...
Defense Technical Information Archive
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Topics: DTIC Archive, MISSISSIPPI STATE UNIV MISSISSIPPI STATE CENTER FOR ADVANCED VEHICULAR SYSTEMS,...
Defense Technical Information Archive
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Numerous organizational mergers fail because the post-merger integration process fails: this research responds by investigating the concealed relationship of the known, premerger organizational characteristics, on the unknown, post-merger consequences. Various structural and behavioral characteristics of the merging organizations are studied to measure their association with two decisive outcomes: the integration of the distinctive cultures and the combined organization s performance....
Topics: DTIC Archive, CARNEGIE-MELLON UNIV PITTSBURGH PA INST FOR SOFTWARE RESEARCH, *ORGANIZATIONS,...
Defense Technical Information Archive
by Defense Technical Information Center
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This research project is designed to determine the cause of mild traumatic brain injury due to blast overpressure and, if possible, the human tolerance to blast overpressure. It consists of an experimental portion in which 12 swine and 6 post-mortem human subjects (PMHS) are to be exposed to blast. The experimental effort is supplemented by a computer modeling section which can extend the results of the tests to blast scenarios not easily achievable experimentally. In the first report,...
Topics: DTIC Archive, WAYNE STATE UNIV DETROIT MI, *BLAST, *TRAUMATIC BRAIN INJURIES, COMPUTERIZED...
Defense Technical Information Archive
by Defense Technical Information Center
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To protect non-combatants in the operational environment, U.S. Soldiers must apply escalation of force (EOF) procedures in uncertain and fast-paced situations. In response to Army needs, a prototype EOF Training Kit was developed to address methods for training critical EOF competencies. Included in the EOF Training Kit are tactical EOF scenarios for three mission types and three levels of expertise, along with executive and supporting materials. Two versions of each scenario are...
Topics: DTIC Archive, Johnston,Jack, Northrop Grumman Reston United States, army training, military...
Defense Technical Information Archive
by Defense Technical Information Center
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Surfaces that modify their texture (potentially multiscale) in response to either direct control or automatic feedback from external cues (solar light intensity, temperature, incoming waves, etc.) are particularly attractive for military applications as they could be used to change radar, acoustic, thermal or optical signatures to fulfill mission-specific objectives. A natural question would be: how does one design a surface that can dynamically change shape and have its texture smoothly and...
Topics: DTIC Archive, SOUTHAMPTON UNIV (UNITED KINGDOM), *METAMATERIALS, BIOMIMETICS, CAMOUFLAGE,...
Topics: DTIC Archive, ARMY TANK AUTOMOTIVE RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI, *MILITARY...
Defense Technical Information Archive
by Defense Technical Information Center
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The Canadian Army relies heavily on simulation-supported command and staff training exercises. Small groups of retired officers, called interactors, orchestrate the exercise behind the scenes using computer-based simulation tools to emulate troop actions in the field. The officers being trained work in a simulated headquarters, and contact the interactors by radio, chat or telephone. The quality of the training experience highly depends on the ability of interactors to perform a realistic and...
Topics: DTIC Archive, QUEEN'S UNIV KINGSTON (ONTARIO), *COMPUTERIZED SIMULATION, *COMPUTERS, *LEARNING,...
A Martian pressure static charge elimination tool is currently in development in the Electrostatics and Surface Physics Laboratory (ESPL) at NASA's Kennedy Space Center. In standard Earth atmosphere conditions, static charge can be neutralized from an insulating surface using air ionizers. These air ionizers generate ions through corona breakdown. The Martian atmosphere is 7 Torr of mostly carbon dioxide, which makes it inherently difficult to use similar methods as those used for standard...
Topics: NASA Technical Reports Server (NTRS), MARS ATMOSPHERE, ELECTROSTATICS, STATICS, COMPUTERIZED...
Defense Technical Information Archive
by Defense Technical Information Center
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Dual-process models postulate two distinct modes of information processing, one automatically invoked, highly parallel, and not under conscious control, and the other consciously invoked and limited to serial processing. Stereotype-driven behaviors have been identified as an example of an implicitly activated and automatically invoked behavior. In this effort, we describe the modeling of stereotypes and prejudice, principally with respect to race and religion, in social interactions. We...
Topics: DTIC Archive, BBN TECHNOLOGIES CAMBRIDGE MA, *HUMAN RELATIONS, ATTITUDES(PSYCHOLOGY), BEHAVIOR,...
Defense Technical Information Archive
by Defense Technical Information Center
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The Modelers Data Archive (MDA) was used to validate the RAILCAR toxic industrial chemical (TIC) source characterization model and the Vapor, Liquid, and Solid Tracking (VLSTRACK) atmospheric transport and dispersion (ATD) model for dense gas releases. The source term predictions from RAILCAR were compared to the field trial descriptions in the MDA report. The RAILCAR source parameters were input into VLSTRACK, and the downwind plume results were statistically compared to the MDA data. The...
Topics: DTIC Archive, NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA ASYMMETRIC SYSTEMS DEPT, *CHEMICAL...
The DoD sets forth an objective to employ an active cyber defense capability to prevent intrusions onto DoD networks and systems. Intrusion Detection Systems (IDS) are a critical part of network defense architectures, but their alerts can be difficult to manage. This research applies Queuing Theory to the management of IDS alerts, seeking to answer how analysts and priority schemes effect alert processing performance. To characterize the effect of these two variables on queue wait times, a...
Topics: DTIC Archive, AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF...
Stochastic radiation track structure codes are of great interest for space radiation studies and hadron therapy in medicine. These codes are used for a many purposes, notably for microdosimetry and DNA damage studies. In the last two decades, they were also used with the Independent Reaction Times (IRT) method in the simulation of chemical reactions, to calculate the yield of various radiolytic species produced during the radiolysis of water and in chemical dosimeters. Recently, we have...
Topics: NASA Technical Reports Server (NTRS), STOCHASTIC PROCESSES, GREEN'S FUNCTIONS, CHEMICAL REACTIONS,...
Our progress has focused on advanced numerical algorithms and supporting mathematical theory, with a concentration on higher order geometry in the description of sharp interfaces, stochastic issues in modeling and simulation, and nonlinearities caused by high levels of deformation in the coupling of fluid to solid codes. These general themes are addressed within the context of ARO interests, including parachute drop, brittle fracture, turbulent modeling and turbulent combustion. We developed a...
Topics: DTIC Archive, STATE UNIV OF NEW YORK RESEARCH FOUNDATION AT STONY BROOK OFFICE OF SPONSORED...
The material point method (MPM) is a mixed Eulerian and Lagrangian computational method that allows for the discretization of solid bodies into material points carrying the full material state of the original body. This method is being evaluated as a new implementation within CTH, a code originally developed by Sandia National Laboratories, as a way of eventually dealing with fracture and other difficult solid mechanics scenarios. Applying CTH with MPM to a 2-dimensional plate impact problem...
Topics: DTIC Archive, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH...
Defense Technical Information Archive
by Defense Technical Information Center
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The absorption of electromagnetic energy within human tissue depends upon anatomical posture and body type, e.g., body-mass index. Creating a large number of anatomical models with various body postures is problematic however, given medical scanner costs and acquisition requirements, e.g., the subject must be lying down for CT and MRI acquisitions. We propose to deliver software, documentation, and examples relating to our research aimed at modifying the anatomical pose and body morphology...
Topics: DTIC Archive, KITWARE INC CLIFTON PARK NY, *ANATOMICAL MODELS, *COMPUTERIZED SIMULATION,...
Chemical, Biological, Radiological-Nuclear and Explosives (CBRNE) pose a real threat to Canadians and indeed to North Americans. The events of September 11th, 2001 prove that we are not immune to terrorist attacks, and that our lives and psychological wellbeing can be destroyed in an instant when one of these attacks is executed on Canadian and/or North American soil. The Chemical, Biological, Radiological-Nuclear and Explosives Research and Technology Initiative (CRTI) has been conceived to...
Topics: DTIC Archive, Hasham,Zubin, 3DInternet Inc Calgary, Alberta Canada, first responsers, training,...
The research employed stable boundary layer measurements using the DataHawk UAV and high-resolution direct numerical simulations (DNS) to examine the interactions and instabilities occurring in multi-scale flows that drive intermittent turbulence events in the stable atmosphere. Both measurements and the DNS revealed the occurrence and persistence of sheet-and-layer structures in the temperature and velocity fields that arise from, and drive, successive instabilities including Kelvin-Helmholtz...
Topics: DTIC Archive, GATS INC NEWPORT NEWS VA, *ATMOSPHERE MODELS, *ATMOSPHERIC MOTION, *BOUNDARY LAYER,...
NASA Network Resource and Training Site
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J-2X engine testing on the A-2 test stand at the NASA John C. Stennis Space Center (SSC) has recently concluded. As part of that test campaign, the engine was operated at lower power levels in support of expanding the use of J-2X to other missions. However, the A-2 diffuser was not designed for engine testing at the proposed low power levels. To evaluate the risk of damage to the diffuser, computer simulations were created of the rocket engine exhaust plume inside the 50ft long, water-cooled,...
Topics: NASA Technical Reports Server (NTRS), ROCKET ENGINES, ENGINE TESTS, EXHAUST GASES, HEAT TRANSFER,...
NASA Network Resource and Training Site
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Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, FINITE ELEMENT METHOD, DUMMIES,...
One of the greatest challenges when developing propulsion systems is predicting the interacting effects between the fluid loads, thermal loads, and structural deflection. The interactions between technical disciplines often are not fully analyzed, and the analysis in one discipline often uses a simplified representation of other disciplines as an input or boundary condition. For example, the fluid forces in an engine generate static and dynamic rotor deflection, but the forces themselves are...
Topics: NASA Technical Reports Server (NTRS), MULTIDISCIPLINARY DESIGN OPTIMIZATION, LOADS (FORCES), DESIGN...
Defense Technical Information Archive
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The implementation of the Monte Carlo Tree Search (MCTS) algorithm into the Combined Arms Analysis Tool for the 21st Century (COMBATXXI) project is an extension of work completed in FY13. The TRADOC Analysis Center - Methods and Research Office (TRAC-MRO) sponsored this iteration in an attempt to test the feasibility implementing the algorithm into the COMBATXXI simulation environment. For further details on the specific algorithm of more background information see appendix and the previous...
Topics: DTIC Archive, ARMY TRADOC ANALYSIS CENTER MONTEREY CA, *ALGORITHMS, *COMPUTER PROGRAMS, *MONTE...
The Navy small arms training and qualification instruction focused on dry fire and simulators should be utilized when available. However, naval personnel often do not have access to dry fire training opportunities and therefore may be at risk for losing perishable marksmanship skills. The purpose of the study was to determine if the use of a simulator is at least as effective in marksmanship training as traditional dry fire techniques. A between-groups study with a random selection of...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA MODELING VIRTUAL ENVIRONMENTS AND SIMULATION...
Defense Technical Information Archive
by Defense Technical Information Center
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Empirically grounded multi-agent meta-network multi-level simulations were developed, tested, validated and then used to explain and predict socio-cultural outcomes. Virtual experiments employing real and virtual data were conducted examining the impact of group structure and the communication media on the evolution of the group, the culture and the change in sentiment. The Arab Spring was used as a case example. A formal theory of socio-cultural dynamics based on the co-evolution of self and...
Topics: DTIC Archive, CARNEGIE-MELLON UNIV PITTSBURGH PA, *GROUP DYNAMICS, COMPUTERIZED SIMULATION,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), PRINTING, ADDITIVES, MANUFACTURING, POWDER (PARTICLES),...
Defense Technical Information Archive
by Defense Technical Information Center
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This project addresses the Sea Based Aviation (SBA) virtual dynamic interface (VDI) research topic area Fast, high-fidelity physics-based simulation of coupled aerodynamics of moving ship and maneuvering rotorcraft. All software supporting piloted simulations must run at real time speeds or faster. This requirement drives the number of equations that can be solved and in turn the fidelity of supporting physics based models. For real-time aircraft simulations, all aerodynamic related information...
Topics: DTIC Archive, PENNSYLVANIA STATE UNIV STATE COLLEGE DEPT OF AEROSPACE ENGINEERING, *CARRIER...
NASA Network Resource and Training Site
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Topics: NASA Technical Reports Server (NTRS), COLLISIONS, NEUTRON STARS, GAMMA RAY BURSTS, JETS,...
Defense Technical Information Archive
by Defense Technical Information Center
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Over the past 15 years, a broad partnership of institutions has collaborated on developing and demonstrating the performance and application of eddy-resolving, real-time global and basin-scale ocean prediction systems using the HYbrid Coordinate Ocean Model (HYCOM). This paper is intended to briefly summarise the current status of global high resolution eddy-rich or eddying HYCOM simulations and their relevance to high resolution coupled oceanatmosphere- ice climate simulations. In this...
Topics: DTIC Archive, NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV,...
This volume describes the work performed for Task C - Creation of Multi-fidelity Aerodynamic Analysis Tool. This task focuses on the development of a methodology employing contour-based sampling and multi-fidelity modeling in the creation of aerodynamic surrogate models. The methodology is successfully demonstrated for a parametric reusable booster vehicle.
Topics: DTIC Archive, GEORGIA TECH RESEARCH INST ATLANTA, *BOOST GLIDE VEHICLES, *COMPUTATION SCIENCE,...
Present and anticipated NATO missions require highly trained and capable military personnel. Units need to be able to deploy with little or no notice and to adapt to evolving situations. This places them in locations where they do not have the facilities needed to train, plan and rehearse complex missions. The use of embedded virtual simulation (EVS) is seen as a potential tool to provide more effective deployed training. EVS is a concept that tightly integrates training and mission...
Topics: DTIC Archive, NATO SCIENCE AND TECHNOLOGY ORGANIZATION NEUILLY-SUR-SEINE (FRANCE), *TRAINING...
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 RECTOR AND VISTORS OF THE UNIVERSITY OF VIRGINIA, *EYE...
High fidelity simulation of the effects of buried explosive devices on military vehicles requires accurate models of the Equation of State and constitutive properties of the soil and efficient procedures for applying blast loads in finite element structural dynamics codes such as LS-DYNA. The ERDC Hybrid Elastic Plastic (HEP) geo-material model has proven to be an effective model for a wide variety of soils and other geo-materials in Lagrangian finite element simulations of blast and...
Topics: DTIC Archive, MISSISSIPPI STATE UNIV STARKVILLE CENTER FOR ADVANCED VEHICULAR SYSTEMS ERC, *BLAST,...
Defense Technical Information Archive
by Defense Technical Information Center
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The PIs investigated quantum computation and information at the intersection of physics and computer science. They worked on a wide range of topics with some common themes related by the study of quantum Hamiltonians. Ground state properties of Hamiltonians and the gap between the ground state and first excited state were related to computational questions. The PIs relied on abstract mathematical reasoning as well as computer simulation. Topics covered included investigations of the performance...
Topics: DTIC Archive, MASSACHUSETTS INST OF TECH CAMBRIDGE, *ALGORITHMS, *QUANTUM COMPUTING, *QUANTUM...
Defense Technical Information Archive
by Defense Technical Information Center
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This grant funded the acquisition of a computer laboratory for multiscale modeling of nanomaterials. The laboratory includes a share in new Rutgers School of Engineering computational facilities and several PC workstation furnished with commercial and in-house simulation software. This equipment supports the computational needs of the group of the PI at Rutgers University. The group continues the research on novel polymeric materials needed for chemical and biological defense.
Topics: DTIC Archive, RUTGERS - THE STATE UNIV NEW BRUNSWICK NJ, *COMPUTER PROGRAMS, *COMPUTERIZED...
LONG-TERM GOALS: To provide the Navy with a non-invasive measurement technique and a numerical simulation tool for analyzing the vibration response of high-speed towed cables using a helicopter. The non-invasive measurement technique is based on fiber Bragg gratings, which measure the tensions and transverse vibrations of a high-speed tow cable at multiple sites along the cable. The numerical tool is based on combining two software applications, WHOI CABLE for calculating tow cable shape and an...
Topics: DTIC Archive, MASSACHUSETTS INST OF TECH CAMBRIDGE CENTER FOR OCEAN ENGINEERING, *TOWING CABLES,...
Defense Technical Information Archive
by Defense Technical Information Center
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Craig Reynolds, in the seminal research into simulated flocking, developed a methodology to guide a flock of birds using three rules: collision avoidance, flock centering, and velocity matching. By modifying these rules, a methodology was created so that each aircraft in a flock maintains a precise position relative to the preceding aircraft. By doing so, each aircraft experiences a decrease in induced aerodynamic drag and increase in fuel efficiency. Flocks of semi-autonomous aircraft present...
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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MANA (Map Aware, Non-uniform, Automata) is an agent-based, time-stepped, stochastic mission-level modeling environment developed by the New Zealand Defense Technology Agency (DTA). While the MANA user manual goes into detail about setting up a scenario and navigating the user interface, it does not discuss some of the underlying mathematical procedures and algorithms resulting in many individuals utilizing MANA to analyze military operations without necessarily understanding how the results are...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *ALGORITHMS, *MATHEMATICAL ANALYSIS, AUTOMATA,...
Over the past decade, there has been much progress towards improved phenomenological modeling and algorithmic updates for the direct simulation Monte Carlo (DSMC) method, which provides a probabilistic physical simulation of gas Rows. These improvements have largely been based on the work of the originator of the DSMC method, Graeme Bird. Of primary importance are improved chemistry, internal energy, and physics modeling and a reduction in time to solution. These allow for an expanded range of...
Topics: NASA Technical Reports Server (NTRS), OBJECT-ORIENTED PROGRAMMING, DIRECT NUMERICAL SIMULATION,...
Defense Technical Information Archive
by Defense Technical Information Center
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The goal of this project is to integrate novel numerical modeling and computer hardware approaches to compute the non-linear aerodynamic coupling between the ship and aircraft in such a way that execution times are at real-time speeds, allowing for pilot-in-the-loop CFD to be integrated in the piloted flight simulation environment. To achieve the speed gains required, three areas will be targeted for implementation into the CFD simulation framework: (1) numerical algorithms, (2) novel domain...
Topics: DTIC Archive, COMBUSTION RESEARCH AND FLOW TECHNOLOGY INC PIPERSVILLE PA, *AIRCRAFT MODELS,...
Marine phytoplankton and associated organic materials absorb a substantial quantity of solar shortwave energy penetrating the upper ocean. Most of this absorbed energy is lost as heat and thereby contributes to the warming of near-surface waters. Here we examine this biothermal feedback effect on upper ocean physics and air-sea energy exchange using a fully integrated ocean-atmosphere-biological modeling system. Our model simulations show that a local phytoplankton bloom may impact upper ocean...
Topics: DTIC Archive, NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS, *ATMOSPHERE MODELS,...
NASA Network Resource and Training Site
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Software-Only-Simulations have been an emerging but quickly developing field of study throughout NASA. The NASA Independent Verification Validation (IVV) Independent Test Capability (ITC) team has been rapidly building a collection of simulators for a wide range of NASA missions. ITC specializes in full end-to-end simulations that enable developers, VV personnel, and operators to test-as-you-fly. In four years, the team has delivered a wide variety of spacecraft simulations that have ranged...
Topics: NASA Technical Reports Server (NTRS), APPLICATIONS PROGRAMS (COMPUTERS), COMPUTERIZED SIMULATION,...
Defense Technical Information Archive
by Defense Technical Information Center
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Stenoses (blockages) in coronary arteries cause heart attack, which the Centers for Disease Control and Prevention ranks as the leading cause of death among American adults. We have performed computer simulations in order to understand the flow patterns due to stenoses with and without a guidewire used for interventional procedures (e.g., stent deployment). Building off previous models that have been partially validated with experimental data, this thesis continues to develop the models in...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *BLOOD CIRCULATION, *COMPUTERIZED SIMULATION,...
Defense Technical Information Archive
by Defense Technical Information Center
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While the AE9/AP9/SPM Radiation and Plasma Environment Model is distributed with both GUI and command-line applications for running the model, there are situations where it is more appropriate to more directly integrate other applications with the model. The model is distributed with an Application Programming Interface (API) suite for such situations. This report provides documentation on the API suite for AE9/AP9/SPM, covering installation and setup and details on the APIs for C++, C, and...
Topics: DTIC Archive, ATMOSPHERIC AND ENVIRONMENTAL RESEARCH INC LEXINGTON MA, *APPLICATION PROGRAMMING...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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Topics: NASA Technical Reports Server (NTRS), ROBOTICS, ROBOT DYNAMICS, SYSTEMS ENGINEERING, SOFTWARE...
A human-in-the-loop experiment was conducted at the NASA Ames Research Center Vertical Motion Simulator, where instrument-rated pilots completed a simulated terminal descent phase of a lunar landing. Ten pilots participated in a 2 x 2 mixed design experiment, with level of automation as the within-subjects factor and failure frequency as the between subjects factor. The two evaluated levels of automation were high (fully automated landing) and low (manual controlled landing). During test...
Topics: NASA Technical Reports Server (NTRS), FAILURE, LUNAR LANDING, HUMAN-COMPUTER INTERFACE, SIMULATION,...
Defense Technical Information Archive
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Full-vehicle, End-to-End under-body blast(UBB) simulations with LS-DYNA have been common practice at the Tank Automotive Research, Development and Engineering Center (TARDEC) for the last several years to support Program Managers in the Army Acquisition of military ground vehicles. Soil, which is one of the four key components (with air, charge, and vehicle structure being the others), has been represented in these simulations by an Elastic-Plastic Hydrodynamic (EPH)2 model. EPH models has been...
Topics: DTIC Archive, ALTAIR ENGINEERING INC TROY MI, *BLAST, *SOIL MECHANICS, *SOIL MODELS, COMPUTERIZED...
The aim of cognitive social simulation is to improve our understanding of the complex inter-play between factors that are spread across the cognitive, social and technological domains. This makes cognitive social simulation techniques particularly appealing as a means to undertake experiments into socially-distributed cognition. The current paper reports on the results of an ongoing effort to develop a cognitive social simulation capability that can be used to undertake studies into team...
Topics: DTIC Archive, SOUTHAMPTON UNIV (UNITED KINGDOM) SCHOOL OF ELECTRONICS AND COMPUTER SCIENCE,...
Simulations of a model configuration of a lean direct injection (LDI) gas turbine combustor were performed to assess the effects of fuel spray modeling in predicting combustion instability. Concurrently, experimental data were obtained at the same conditions in a test combustor with the same configuration for comparison. To improve the simulation predictions, fuel spray modeling was tuned and assessed in two major steps. First, focus is put on the Weber number-adaptive hybrid model that...
Topics: DTIC Archive, AIR FORCE RESEARCH LAB EDWARDS AFB CA ROCKET PROPULSION DIV, *COMBUSTION STABILITY,...
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Complex warfighter systems are increasingly required for continuing United States dominance, which drives a need for high quality Systems Engineering (SE) processes. A System Engineering Health and Visualization (SEHV) capability is needed so that leadership can gain insight into potential SE risk areas, allowing them to be proactive instead of reactive to issues leading to program failures, thus saving time, effort, and costs. This capstone s purpose was to determine if an automated means of...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF SYSTEMS ENGINEERING, *PROJECT...
Simulation codes often utilize finite-dimensional approximation resulting in numerical error. Some examples include, numerical methods utilizing grids and finite-dimensional basis functions, particle methods using a finite number of particles. These same simulation codes also often contain sources of uncertainty, for example, uncertain parameters and fields associated with the imposition of initial and boundary data,uncertain physical model parameters such as chemical reaction rates, mixture...
Topics: NASA Technical Reports Server (NTRS), COMPUTATIONAL FLUID DYNAMICS, ERROR ANALYSIS, COMPUTERIZED...
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During the three-year performance period we have carried out a program of theoretical research on the foundations and potential applications of coherent-feedback quantum control. We have focused on potential applications in quantum-enhanced meterology and information processing, and on hardware platforms of an optical or opto-mechanical nature. The studies we have been performing begin to build a picture of how coherent feedback can provide a kind of circuit/network theory for quantum...
Topics: DTIC Archive, STANFORD UNIV CA, *OPTOELECTRONICS, *QUANTUM COMPUTING, *QUANTUM OPTICS, COMPUTERIZED...
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NASA is a household name in this day and age, known commonly as America's government-run powerhouse of innovation and space exploration. It is a common dream for students to be a part of NASA's workforce, but I did not realize that it was my dream until I found that I could not imagine working anywhere else. From August to December, I had the privilege of a co-op tour with NASA at the Johnson Space Center. The National Aeronautics and Space Administration (NASA) first formed in the early...
Topics: NASA Technical Reports Server (NTRS), DATA BASES, STRUCTURAL ENGINEERING, MODAL RESPONSE, SYSTEMS...
The work presented in this paper is to promote research leading to a closed-loop control system to actively suppress thermo-acoustic instabilities. To serve as a model for such a closed-loop control system, a one-dimensional combustor simulation composed using MATLAB software tools has been written. This MATLAB based process is similar to a precursor one-dimensional combustor simulation that was formatted as FORTRAN 77 source code. The previous simulation process requires modification to the...
Topics: NASA Technical Reports Server (NTRS), APPLICATIONS PROGRAMS (COMPUTERS), COMBUSTION CHAMBERS,...
Defense Technical Information Archive
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The objective was to study how well a building integrated photovoltaic (BIPV) roof, mainly consisting of photovoltaic (PV) laminates bonded to a polyvinyl-chloride (PVC) membrane, performed as PV and roofing systems. The project focused on studying three BIPV systems, but additional sites were surveyed for ancillary information and comparison. In-person roof surveys using the ROOFER Engineered Management Systems approach and laboratory testing based on ASTM D 4434 tests were used to evaluate...
Topics: DTIC Archive, NAVAL FACILITIES ENGINEERING COMMAND PORT HUENEME CA NAVAL FACILITIES ENGINEERING AND...
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The third generation model for wind-generated surface gravity waves WAVEWATCH III is modified to represent the effect of ice on waves as a source function. This replaces the existing approach of representing ice via fractional blocking (per grid cell) of wave propagation using ice concentration. We have implemented three alternative formulations of varying complexity. The first dissipative source function is a simplistic model where dissipation rate is specified directly. The second dissipative...
Topics: DTIC Archive, NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV,...
As part of the Phase 1 efforts of NASA's UAS-in-the-NAS Project a task was initiated to explore the merits of developing a system simulation capability for UAS to address airworthiness certification requirements. The core of the capability would be a software representation of an unmanned vehicle, including all of the relevant avionics and flight control system components. The specific system elements could be replaced with hardware representations to provide Hardware-in-the-Loop (HWITL) test...
Topics: NASA Technical Reports Server (NTRS), SYSTEMS INTEGRATION, AIRCRAFT RELIABILITY, COMPUTERIZED...
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The practice of stop-loss retains soldiers who are scheduled to end their voluntary terms of active service during an impending or ongoing deployment. These involuntary extensions are legal and have been employed by the U.S. Army over the past two decades. They provide a highly efficient means for meeting the high-priority needs of deployed units. Because stop-loss keeps soldiers in their units, it generally fills deployment needs in the least amount of time possible and minimizes the budgetary...
Topics: DTIC Archive, RAND NATIONAL DEFENSE RESEARCH INST SANTA MONICA CA, *ACTIVE DUTY, *ARMY PERSONNEL,...
The beneficial effects of seat stroke on lower lumbar loads, and energy absorbing floors on lower and upper tibia loads are numerically simulated by LS-DYNA3D in an accelerative vertical loading environment. The Hybrid III 50% male dummy occupant dummy is seated in a generic seat system of a ground vehicle interior and restrained with a 5-point seatbelt system. A retractor system is attached between the back of the stroking seat and the hull to provide the desired seat stroking characteristics....
Topics: DTIC Archive, ARMY TANK AUTOMOTIVE RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI, *SEATS,...
Research progress over the past year focused on imaging of lens fiber cell structure using confocal laser scanning microscopy (CLSM), and type IV collagen structure using cryo-electron microscopy and tomography (cryo-EM and ET). The CLSM has demonstrated the ability to generate good structural identification of lens fiber cells at 10X objective, while the cryo- EM and ET have not yet positively identified type IV collagen structure of the lens capsule. The collaborations with Dr. Vernerey of CU...
Topics: DTIC Archive, COLORADO UNIV AT BOULDER, *BLAST LOADS, *CATARACTS, *FINITE ELEMENT ANALYSIS,...
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This final report summarizes research and development support that Ball Aerospace provided to the 711th Human Performance Wing, Human Effectiveness Directorate (RH), through the Warfighter Interface Research and Technology Operations (WIRTO) Contract (FA8650-08-D-6801), Task Order 0020, Behavioral Influence Modeling and Simulation. This task order supported research within the Human-Centered ISR Division (RHX) that focused on cognitive models that incorporated various types of tacit knowledge,...
Topics: DTIC Archive, BALL AEROSPACE SYSTEMS GROUP FAIRBORN OH SYSTEMS ENGINEERING DIV, *BEHAVIOR,...
In a simultaneous paired approach to closely-spaced parallel runways, a pair of aircraft flies in close proximity on parallel approach paths. The longitudinal separation between the aircraft must be maintained within a range that avoids wake encounters and, if one of the aircraft blunders, avoids collision. To increase operational availability, the approach procedure must accommodate a mixture of aircraft sizes and, consequently, approach speeds. In these procedures, the slower aircraft is...
Topics: NASA Technical Reports Server (NTRS), KINEMATICS, AIRCRAFT APPROACH SPACING, RUNWAYS, COLLISION...
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In this paper, we study a simple iterative method for finding the Dantzig selector, which was designed for linear regression problems. The method consists of two main stages. The first stage is to approximate the Dantzig selector through a fixed-point formulation of solutions to the Dantzig selector problem. The second stage is to construct a new estimator by regressing data onto the support of the approximated Dantzig selector. We compare our method to an alternating direction method, and...
Topics: DTIC Archive, AIR FORCE RESEARCH LAB ROME NY INFORMATION DIRECTORATE, *LINEAR REGRESSION ANALYSIS,...
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Due to the increasing availability of data and wider use of analytics, the ingredients for increased reliance on modeling and simulation are now present. Tremendous progress has been made in the field of modeling and simulation over the last six decades. Software and methodologies have advanced greatly. In the area of weather, future-casts based on model predictions have become highly accurate and heavily relied upon. This is happening in other domains, as well. In a similar vein, drivers may...
Topics: DTIC Archive, AIR FORCE OFFICE OF SCIENTIFIC RESEARCH ARLINGTON VA, *COMPUTER SCIENCE,...
NUMIT has been refined, developed, and greatly enhanced so that it can be used to model and predict the deep charging of dielectrics on spacecraft. The new tool, called AF-NUMIT2, can now model isotropically incident electron fluxes from realistic energy spectra that change with time. The model has been extended to incident electron fluxes an order of magnitude lower than before (less than = 10 keV), and aspects of the model have been checked against Monte Carlo simulations. Electron energy...
Topics: DTIC Archive, BETHEL UNIV SAINT PAUL MN, *DIELECTRICS, *MATHEMATICAL MODELS, *SOFTWARE TOOLS,...
The Atmosphere Revitalization Recovery and Environmental Monitoring (ARREM) project was initiated in September of 2011 as part of the Advanced Exploration Systems (AES) program. Under the ARREM project, testing of sub-scale and full-scale systems has been combined with multiphysics computer simulations for evaluation and optimization of subsystem approaches. In particular, this paper describes the testing and modeling of various subsystems of the carbon dioxide removal assembly (CDRA). The goal...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, CARBON DIOXIDE REMOVAL,...
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Spacecraft charging occurs when charged particles from the surrounding space plasma environment contact a spacecraft and unequal charging currents result in a net charge density accumulation on or in spacecraft materials. Charging becomes a threat when differential potentials between two points on the spacecraft or between the spacecraft and the ambient space environment build to the level that electric fields associated with the potentials exceed the electric breakdown strength of the...
Topics: NASA Technical Reports Server (NTRS), SPACECRAFT CHARGING, AEROSPACE ENVIRONMENTS, CHARGED...
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A study was conducted to characterize the interaction between physical load and environment on dismounted Soldier performance in navigation and auditory vigilance tasks. Three issues were explored: the effect of a 24-kg physical load on performance, the effect of real and virtual environments on performance, and the potential of radio check response time, duration, and accuracy as measures of cognitive performance. Handheld paper maps were used to navigate through four different environments: a...
Topics: DTIC Archive, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD HUMAN RESEARCH AND ENGINEERING...
Our model of action selection and postcompletion error in two form filling tasks extends to skip errors in a story telling task. We also discuss how it explains perseverations in one of the aforementioned form filling tasks. Finally we discuss a predictive classifier application we built from the model's data. The classifier could allow an autonomous agent to know when it is a bad time to interrupt a human, when a human is about to err, and how to help.
Topics: DTIC Archive, NAVAL RESEARCH LAB WASHINGTON DC, *ERROR ANALYSIS, *INFORMATION PROCESSING,...
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We theoretically propose a novel scheme for sub-diffraction imaging based on a process of adiabatic decompression of the local wavelength of a surface plasmon polariton supported by two adjoining curved metal surfaces.]]n Fig.1(a) we show the layout of the proposed scheme. A metallic sphere is brought in close proximity of a second metallic interface.
Topics: DTIC Archive, DUKE UNIV DURHAM NC, *DECOMPRESSION, *DIFFRACTION, *METALS, *PLASMONS, ADIABATIC...
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Given constraints dictated by the current fiscal environment, the Army has been directed to reduce its total personnel strength from around 1.05 million across the active duty, Army National Guard, and Army Reserve, to a maximum of around 980 thousand personnel. In particular, the active duty Army will have to drawdown to around 450 thousand personnel. In this paper we discuss a methodology the Army is using to help inform decisions about how to execute this drawdown. We describe a...
Topics: DTIC Archive, CENTER FOR ARMY ANALYSIS FORT BELVOIR VA, *ARMY OPERATIONS, *COMPUTERIZED SIMULATION,...
NASA is collaborating with private entities for the development of commercial space vehicles. The Space and Clinical Operations Division was tasked to review the oxygen and respiratory support system and recommend what capabilities, if any, the vehicle should have to support the return of an ill or injured crewmember. The Integrated Medical Model (IMM) was utilized as a data source for the development of these recommendations. The Integrated Medical Model (IMM) was used to simulate a six month,...
Topics: NASA Technical Reports Server (NTRS), AEROSPACE MEDICINE, INTERNATIONAL SPACE STATION, RESPIRATORY...
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In April 2012, NASA directed Boeing to conduct a study to assess the feasibility of implementing a simplified soft capture system, as a possible replacement for the soft capture system portion of the baseline NASA Docking System (NDS). This paper describes the study conducted and conclusions drawn that supported the selection of the Soft Impact Mating and Attenuation Concept (SIMAC) as the replacement of the International Low Impact Docking System's (iLIDS) soft capture system.
Topics: NASA Technical Reports Server (NTRS), SPACECRAFT DOCKING, COMPUTERIZED SIMULATION, DESIGN ANALYSIS,...
Life support systems for manned spacecraft must provide breathable air and drinkable water for the astronauts. Through the Atmosphere Revitalization Recovery and Environmental Monitoring (ARREM) project, engineers at NASA are developing atmosphere control devices for the safety of the onboard crew. The atmosphere in a manned spacecraft needs to be regularly revitalized in order to ensure the safety of the astronauts and the success of the space mission. For missions lasting a few months, this...
Topics: NASA Technical Reports Server (NTRS), LIFE SUPPORT SYSTEMS, MANNED SPACECRAFT, CARBON DIOXIDE...
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A new blast code, Loci/BLAST, has been coupled with the commercial structural dynamics package LS-DYNA to provide a fully-coupled simulation strategy for predicting the effects of blast on a ground vehicle. Loci/BLAST is a fully-conservative, computational fluid dynamics code with the capability to model soil and blast using a multispecies formulation with advanced equations of state. The two-way coupling between Loci/BLAST and LS-DYNA provides a robust mechanism for predicting the...
Topics: DTIC Archive, MISSISSIPPI STATE UNIV MISSISSIPPI STATE CENTER FOR ADVANCED VEHICULAR SYSTEMS,...
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 rollover). Simulation of the entire blast event is computationally intensive due to the high fidelity level of the model and the long duration of the event. The purpose of this project was to develop a computationally-efficient, reduced order model to simulate the blast event in one single...
Topics: DTIC Archive, ARMY TANK AUTOMOTIVE RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI, *BLAST,...
The Advanced Resistive Exercise Device (ARED) is the resistive exercise device used by astronauts on the International Space Station (ISS) to mitigate bone loss and muscle atrophy due to extended exposure to microgravity (micro g). The Digital Astronaut Project (DAP) has developed a multi-body dynamics model of biomechanics models for use in spaceflight exercise physiology research and operations. In an effort to advance model maturity and credibility of the ARED model, the DAP performed...
Topics: NASA Technical Reports Server (NTRS), INTERNATIONAL SPACE STATION, EXERCISE PHYSIOLOGY, BONE...
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In this grant period we were able to make significant advances in our understanding of a number of issues related to the processing and proper ties of nanocomposite networks. We showed that a non-Brownian suspension of micron scale rods exhibits reversible shear-driven formation of disordered aggregates resulting in dramatic viscosity enhancement at low shear rates. We also developed a new technique, Boundary Stress Microscopy, to quantify the non-uniform surface stresses in sheared collagen...
Topics: DTIC Archive, GEORGETOWN UNIV WASHINGTON DC, *ELASTIC PROPERTIES, *FIBER REINFORCED COMPOSITES,...
A design study was completed to explore the theoretical physical capacity (TPC) of the John F. Kennedy International Airport (KJFK) runway system for a northflow configuration assuming impedance-free (to throughput) air traffic control functionality. Individual runways were modeled using an agent-based, airspace simulation tool, the Airspace Concept Evaluation System (ACES), with all runways conducting both departures and arrivals on a first-come first-served (FCFS) scheduling basis. A...
Topics: NASA Technical Reports Server (NTRS), SAFETY, AIRPORTS, AIR TRAFFIC CONTROL, AIRSPACE, RUNWAYS,...
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Major disruptions such as terror attacks, natural disasters and human failures can have large impacts on critical infrastructure. The rapid reconstitution of those infrastructure systems after a major disruption is crucial to minimize the impact of the disaster. This thesis compares two different modeling techniques to minimize the cost for reconstructing the infrastructure system. The first technique uses a mixed integer linear program to minimize the operation cost of a infrastructure system....
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *COST ANALYSIS, *INFRASTRUCTURE, *LINEAR...
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This project's dual objectives are the preparation of the PI for a career in breast cancer research and the design of a system of computer-base simulations capable of evaluating the effectiveness of various methods of breast cancer brachytherapy treatments both in general and for each individual patient for use in clinical decision-making. An initial simple tissue and device model developed using the finite element software ABAQUS was expounded upon to create a more complex model utilizing...
Topics: DTIC Archive, CALIFORNIA UNIV SAN DIEGO LA JOLLA, *BREAST CANCER, *COMPUTERIZED SIMULATION,...
Defense Technical Information Archive
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The model development process created at the TBRL has successfully created models from LVC simulation data, simulated models over time to generate simulated crowd data per condition, performed analysis of observed and simulated data, and compared simulated and observed data against crowd behavioral measures. The process allows for quantitative means for validation of both the mathematical (statistical) and computational models against empirical data. These findings support the claim that more...
Topics: DTIC Archive, ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ TARGET...
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This paper reports our participation in the Federated Web Search Track in TREC 2014. We submitted 21 runs for all the three tasks: Vertical Selection (7), Resource Selection (7) and Results Merging (7). Our main purpose is to test several established resource selection methods on the new realistic FedWeb test collections. We evaluated 7 well known resource selection methods for the vertical selection and resource selection tasks. The effectiveness of these methods in the RS tasks does not carry...
Topics: DTIC Archive, DREXEL UNIV PHILADELPHIA PA COLL OF COMPUTING AND INFORMATICS, *DATA MINING,...
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The US Army's training for staff officers has consistently been identified as one of the major factors for US military success over the last century. As technology has improved the Army has sought to replicate many facets of this training with computer simulations. While the use of automation yields benefits as the force utilizes technology in real world operations, developing technological based systems has potential drawbacks that other training methods may alleviate. Traditional manual...
Topics: DTIC Archive, ARMY COMMAND AND GENERAL STAFF COLLEGE FORT LEAVENWORTH KS SCHOOL OF ADVANCED...
Icing calculations were performed for a NACA 0012 swept wing tip using LEWICE3D Version 3.48 coupled with the ANSYS CFX flow solver. The calculated ice shapes were compared to experimental data generated in the NASA Glenn Icing Research Tunnel (IRT). The IRT tests were designed to test the performance of the LEWICE3D ice void density model which was developed to improve the prediction of swept wing ice shapes. Icing tests were performed for a range of temperatures at two different droplet...
Topics: NASA Technical Reports Server (NTRS), ICE FORMATION, AIRCRAFT ICING, SWEPT WINGS, LEADING EDGES,...
Disclosed are methods and apparatuses provided for modifying the effect of an operator controlled input device on an interactive device to encourage the self-regulation of at least one physiological activity by a person different than the operator. The interactive device comprises a display area which depicts images and apparatus for receiving at least one input from the operator controlled input device to thus permit the operator to control and interact with at least some of the depicted...
Topics: NASA Technical Reports Server (NTRS), TEAMS, GAMES, CONTROL THEORY, PHYSIOLOGY, BIOFEEDBACK,...
This paper describes the potential of the power campus located at the NASA Glenn Research Center (GRC) in Cleveland, Ohio for microgrid development. First, the benefits provided by microgrids to the terrestrial power grid are described, and an overview of Technology Needs for microgrid development is presented. Next, GRC's work on development of autonomous control for manned deep space vehicles, which are essentially islanded microgrids, is covered, and contribution of each of these...
Topics: NASA Technical Reports Server (NTRS), AUTONOMY, DEEP SPACE NETWORK, MANNED SPACECRAFT, SPACECRAFT...
A modular thermodynamic simulation package called the Toolbox for the Modeling and Analysis of Thermodynamic Systems (T-MATS) has been developed for the creation of dynamic simulations. The T-MATS software is designed as a plug-in for Simulink (Math Works, Inc.) and allows a developer to create system simulations of thermodynamic plants (such as gas turbines) and controllers in a single tool. Creation of such simulations can be accomplished by matching data from actual systems, or by matching...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, THERMODYNAMICS, DATA SIMULATION,...
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Although it is accepted that the significant eccentricity of Mercury (0.206) favours entrapment into the 3:2 spin orbit resonance, open are the questions of how and when the capture took place. A recent work by Makarov (Makarov, V.V. [2012]. Astrophys. J., 752, 73) has proven that trapping into this state is certain for eccentricities larger than 0.2, provided we use a realistic tidal model based on the Darwin Kaula expansion of the tidal torque. While in Ibid. a Mercury-like planet had its...
Topics: DTIC Archive, NAVAL OBSERVATORY WASHINGTON DC, *EVOLUTION(GENERAL), *MERCURY(PLANET), *SPIN ORBIT...