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Defense Technical Information Archive
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Nearly 100 explosives events that occurred at the turn of the 20th century have been compared to the predictions of explosion consequence models. Events and data used for the establishment of the original Institute of Makers of Explosives' Intra-plant Distance Tables were simulated in the computer models IMESAFR, and DIRE. Scenarios with over 500 individuals exposed inside K40 in were replicated in the models. The data were separated into open, not open, barricaded, and unbarricaded scenarios....
Topics: DTIC Archive, INSTITUTE OF MAKERS OF EXPLOSIVES WASHINGTON DC, *EXPLOSIONS, *COMPUTERIZED...
A teleoperator-system simulation was used to examine the effects of two control modes (joint-by-joint and resolved-rate), a proximity-display method, and time delays (up to 2 sec) on the control of a five-degree-of-freedom manipulator performing a probe-in-hole alignment task. Four subjects used proportional rotational control and discrete (on-off) translation control with computer-generated visual displays. The proximity display enabled subjects to separate rotational errors from displacement...
Topics: NASA Technical Reports Server (NTRS), DISPLAY DEVICES, REMOTE CONTROL, ROBOTS, TELEOPERATORS,...
The field of computational fluid dynamics (CFD) has advanced to the point where it can now be used for the purpose of fluid dynamics physics education. Because of the tremendous wealth of information available from numerical simulation, certain fundamental concepts can be efficiently communicated using an interactive graphical interrogation of the appropriate numerical simulation data base. In other situations, a large amount of aerodynamic information can be communicated to the student by...
Topics: NASA Technical Reports Server (NTRS), AERODYNAMICS, COMPUTATIONAL FLUID DYNAMICS, COMPUTERIZED...
Defense Technical Information Archive
by Defense Technical Information Center
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In the near future advances in mechanical and electrical engineering will enable the production of a wide variety of relatively low cost robotic vehicles. This thesis investigates the behavior of swans of military robots acting autonomously. The Multi-Agent Robot Swarm Simulation (MARSS) was developed for modeling the behavior of swarm of military robots. MARSS contains state, sensing, and behavioral model building tools that allow a range of complex entities and interactions to be represented....
Topics: DTIC Archive, Dickie, Alistair, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *COMPUTERIZED SIMULATION,...
NASA Network Resource and Training Site
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The research scientist or engineer wishing to perform large scale simulations or to extract useful information from existing databases is required to have expertise in the details of the particular database, the numerical methods and the computer architecture to be used. This poses a significant practical barrier to the use of simulation data. The goal of this research was to develop a high-level computer language called Tensoral, designed to remove this barrier. The Tensoral language provides...
Topics: NASA Technical Reports Server (NTRS), PROGRAMMING LANGUAGES, COMPUTER PROGRAMMING, COMPUTERIZED...
NASA Network Resource and Training Site
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Efficiency and biofidelity of occupant simulations are addressed. Topics covered include: R (ratio of rebound energy to initial energy) and G (ratio of permanent deformation to maximum deformation) parameters: ATB simulator unloading behavior; motion of sphere relative to vehicle after vehicle decelerates; sphere for belt restraint; sphere data for wall impact; head acceleration vs. belt slack x-direction (measured); and head acceleration vs. belt slack x-direction (simulated).
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, IMPACT ACCELERATION, SEAT BELTS,...
A computer simulation study was carried out to evaluate various methods for determining threshold stimulus levels for impact sensitivity tests. In addition, the influence of a number of variables (initial stimulus level, particular stimulus response curve, and increment size) on the apparent threshold values and on the corresponding population response levels was determined. Finally, a critical review of previous assumptions regarding the stimulus response curve for impact testing is presented...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, IMPACT RESISTANCE, IMPACT TESTS,...
NASA Network Resource and Training Site
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Contaminants to be used in qualification and development tests of the add-on charcoal bed scrubber were established, along with rates and methods for their introduction. The contaminant levels to be achieved were predicted and test results were analyzed.
Topics: NASA Technical Reports Server (NTRS), SCRUBBERS, SPACECRAFT CONTAMINATION, SPACELAB, ACCEPTABILITY,...
This report covers technical progress during the fourth quarter of the second year of NASA Sun-Earth Connections Theory Program (SECTP) contract "The Structure and Dynamics of the Solar Corona and Inner Heliosphere," NAS5-99188, between NASA and Science Applications International Corporation (SAIC), and covers the period May 16, 2001 to August 15, 2001. Under this contract SAIC and the University of California, Irvine (UCI) have conducted research into theoretical modeling of active...
Topics: NASA Technical Reports Server (NTRS), SOLAR CORONA, MAGNETOHYDRODYNAMICS, HELIOSPHERE, MATHEMATICAL...
The Operational Value of Intelligence and Electronic Warfare (OPVIEW) project is endeavoring to develop means for evaluating intelligence and electronic warfare/target acquisition (IEW/TA) systems in terms of their contribution to combat outcomes through the use of simulation. The challenge of adequately representing the intelligence process in a simulation model is being met through model representations. These will be described in subsequent documents. A greater and more fundamental challenge...
Topics: DTIC Archive, Bankes, Steven C, RAND CORP SANTA MONICA CA, *COMPUTERIZED SIMULATION, *MILITARY...
Defense Technical Information Archive
by Defense Technical Information Center
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This project focused on a number of issues related to updating beliefs, both qualitative and quantitative, in incompletely specified settings. In addition, work was initiated on the topic of explanation.
Topics: DTIC Archive, Halpern, Joseph Y, CORNELL UNIV ITHACA NY DEPT OF COMPUTER SCIENCE, *KNOWLEDGE BASED...
Defense Technical Information Archive
by Defense Technical Information Center
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This report presents simulation comparisons between an antipodal planar dipole (resonant at 450 MHz) and 3 different meander structures: square, sinusoidal, and triangular. The 3 different structures demonstrate the effect that different meander trace structures can have on size reduction, gain, reflection coefficient, and bandwidth. The meanders were designed first with a circuit equivalent. The results between the 3 structures show that for size reduction the square meander is the preferred...
Topics: DTIC Archive, ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE, *DIPOLE...
Defense Technical Information Archive
by Defense Technical Information Center
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This report summarizes a three-year research project investigating the cognitive processes underlying human planning behavior. The project focused on problems analogous to the naval tactical planning problem: How should the decisionmaker move force units from their current locations to particular task force objectives? Major project tasks included developing a cognitive model of the planning process, implementing the model as a computer simulation and evaluating its performance, and conducting...
Topics: DTIC Archive, Hayes-Roth, Barbara, RAND CORP SANTA MONICA CA, *DECISION MAKING, *PLANNING,...
Defense Technical Information Archive
by Defense Technical Information Center
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The Base Operations-Maintenance Simulator (BOMS), a computer program written in Simscript language, simulates the essential characteristics of an Air Force Base. It represents a SAC B-52/KC-135 organization, but can, with slight modifications represent most other single base operations. Three separate computer programs which make up the BOMS are described. The Data Generator combines a flying schedule with random failures, generated by a Monte Carlo process, with the resources required for...
Topics: DTIC Archive, RAND CORP SANTA MONICA CA, *COMPUTERIZED SIMULATION, *AIRCRAFT MAINTENANCE, MILITARY...
Defense Technical Information Archive
by Defense Technical Information Center
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The purpose of this thesis is to examine overhead costs and allocation methods at the Military Sealift Command (MSC). The command's overhead expenses from Fiscal Year 1988 through 1994 are reviewed and followed by a description of MSC's current method of allocating overhead to specific shipping arrangements. Possible sources of information distortion involved in indirect overhead allocation are discussed, and an alternative method of allocating overhead to ships is suggested. Finally, the...
Topics: DTIC Archive, Hale, Katharine A., NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *MARINE TRANSPORTATION,...
In this work, we have achieved the project goal by (1) enhancing, testing, and delivering WACCM-X model to the overall project PI, Dr. F. Sassi and the NRL team; (2) enabling coupling of WACCM-X with the NAVDAS system, and with the NRL SAMI3 ionosphere and plasmasphere model; (3) collaborating on scientific studies of planetary waves and their impact in the lower thermosphere. A final report detailing these achievements is attached.
Topics: DTIC Archive, UNIVERSITY CORP FOR ATMOSPHERIC RESEARCH (UCAR) BOULDER CO, *SOLAR CYCLE,...
Defense Technical Information Archive
by Defense Technical Information Center
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The future of training games lies in a convergence of commercial off the shelf (COTS games) and high-performance computing
Topics: DTIC Archive, MILITARY ACADEMY WEST POINT NY, *MILITARY TRAINING, *WAR GAMES, *COMPUTER GAMES,...
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by NASA Technical Reports Server (NTRS)
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The molecule modeling method known as Multibody Order (N) Dynamics, or MBO(N)D, was developed by Moldyn, Inc. at Goddard Space Flight Center through funding provided by the SBIR program. The software can model the dynamics of molecules through technology which stimulates low-frequency molecular motions and properties, such as movements among a molecule's constituent parts. With MBO(N)D, a molecule is substructured into a set of interconnected rigid and flexible bodies. These bodies replace the...
Topics: NASA Technical Reports Server (NTRS), MOLECULAR DYNAMICS, COMPUTERIZED SIMULATION, DYNAMIC MODELS,...
The science in this effort was scheduled in the project's third and fourth years, after a long record of high-resolution Global Cloud Imagery (GCI) had been produced. Unfortunately, political disruptions that interfered with this project led to its funding being terminated after only two years of support. Nevertheless, the availability of intermediate data opened the door to a number of important scientific studies. Beyond considerations of the diurnal cycle addressed in this grant, the GCI...
Topics: NASA Technical Reports Server (NTRS), CONVECTION, DIURNAL VARIATIONS, PRECIPITATION (METEOROLOGY),...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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Jet Propulsion Laboratory (JPL) developed video overlay calibration and demonstration techniques for ground-based telerobotics. Through a technology sharing agreement with JPL, Deneb Robotics added this as an option to its robotics software, TELEGRIP. The software is used for remotely operating robots in nuclear and hazardous environments in industries including automotive and medical. The option allows the operator to utilize video to calibrate 3-D computer models with the actual environment,...
Topics: NASA Technical Reports Server (NTRS), TECHNOLOGY UTILIZATION, TELEROBOTICS, REMOTE CONTROL,...
Defense Technical Information Archive
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The members of the Modeling and Simulation Group at Cornell believe that improvements in computer capabilities and in software design tools have the potential to radically alter the manufacturing process. These improvements present unique opportunities for improving manufacturing productivity, an area of strategic importance to our nation's defense and economic future. Potential payoffs to industry and to the military include extended capabilities, increased reliability of components, and...
Topics: DTIC Archive, Hopcroft, John E, CORNELL UNIV ITHACA NY, *COMPUTER AIDED DESIGN, *COMPUTER AIDED...
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...
We have developed a realistic agent-based simulation model of hacker behavior. In the model, hacker scripts are generated using a simple but powerful hacker grammar that has the potential to cover all possible hacker scripts. The model can be used to characterize the evidence generated by any hacker script, including new scripts that appear every day, and to train inexperienced investigators and incident handlers how to deal with a compromised system and look for evidence. The model can also be...
Topics: DTIC Archive, Shargel, Ben, ICOSYSTEM CORP CAMBRIDGE MA, *INTRUSION DETECTION(COMPUTERS),...
Defense Technical Information Archive
by Defense Technical Information Center
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This paper discusses research efforts at the Naval Research Laboratory (NRL) in the area of environmentally adaptive navigation and dynamic mission planning. Presented in this paper is the system architecture being developed for the accomplishment of objective based dynamic navigation. A simulator is being constructed that incorporates this architecture and its design is presented. This simulator will enable the future development of specific mission behavior modules.
Topics: DTIC Archive, McDowell, Patrick, NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOSCIENCES DIV,...
Defense Technical Information Archive
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Computer models of AC generators have been developed, but they are cumbersome, complicated, and lengthy. Reducing the complexity while retaining sufficient accuracy would reduce the cost of the model, thereby reducing the test and development costs. High speed data sampling of an AC generation system is required to investigate the possibility of modifying the model, and, to determine the accuracy limits of the revised model. Verification of the revised model will require measurements from...
Topics: DTIC Archive, Brisbine,Glen Edward, OREGON STATE UNIV CORVALLIS, *SAMPLING, *INSTRUMENTATION,...
Defense Technical Information Archive
by Defense Technical Information Center
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The first part of the work yielded new results on simulated annealing and neural networks while the second part focused on large deviations in high- speed communication networks.
Topics: DTIC Archive, Wong, Eugene, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *NEURAL NETS,...
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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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...
Lighter weight military vehicles facilitate faster transport, higher mobility, fuel conservation, and a reduced ground footprint of supporting forces. At the same time the design of ground combat vehicles to survive a blast from a mine or from any other explosive threats is of great interest in order to provide an appropriate level of protection for the vehicle and its occupants. Weight reduction and high levels of survivability are mutually competing objectives. Therefore, a significant effort...
Topics: DTIC Archive, MICHIGAN ENGINEERING SERVICES LLC ANN ARBOR MI, *COMBAT VEHICLES, *EXPLOSIONS,...
Defense Technical Information Archive
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This and the following two papers report results of the first comprehensive computer simulation of the behavior of the earth's inner magnetosphere during a substorm-type event. We have developed a self-consistent quantitative model to compute electric fields, currents and the resulting plasma flow in the inner-magnetosphere/ionosphere system (L or = 10); parallel electric fields and ionospheric neutral winds are not included. The model was tested for a substorm-type event that occurred on...
Topics: DTIC Archive, Harel,M, RICE UNIV HOUSTON TX, *ELECTRIC CURRENT, *MAGNETOSPHERE, MATHEMATICAL...
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by Defense Technical Information Center
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A goal of this paper is to explore different ways of implementing distributed simulation. Distributed simulation grew out of sequential simulation, and it is possible that the way we think about distributed simulation is unduly influenced by its sequential origins. To free ourselves from unnecessary restrictions on the way we design distributed simulations, in this paper we define the distributed simulation problem somewhat differently than in the literature. We propose the concepts of...
Topics: DTIC Archive, Chandy, K M, CALIFORNIA INST OF TECH PASADENA DEPT OF COMPUTER SCIENCE, *COMPUTERIZED...
Defense Technical Information Archive
by Defense Technical Information Center
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This paper extends earlier results in the area of variance reduction techniques applied to simulation on a computer. In particular, it views the antithetic sampling technique as a combination of rotation and reflection sampling on a circle. The covariance structures induced by the techniques separately and together are derived and conditions under which they are optimal sampling plans are described. Rates of convergence for the variance of the sample mean are given for bounded, continuous and...
Topics: DTIC Archive, Fishman,George S, NORTH CAROLINA UNIV AT CHAPEL HILL, *COMPUTERIZED SIMULATION,...
Defense Technical Information Archive
by Defense Technical Information Center
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Online Alchemy has performed research on the application of its commercially developed software technology to generate an API for computer generated avatars or Non-Playable Characters (NPCS) for potential use in military simulation and training environments. The outcome of this research and development is intended to provide significant improvements and capabilities not currently found in existing NPCS as the state of current technology has limited realism. The main deliverable of this project...
Topics: DTIC Archive, ONLINE ALCHEMY AUSTIN TX, *COMPUTERIZED SIMULATION, *BEHAVIOR, *APPLICATION...
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,...
Extending the concept of trust as a contingency of organizational design based on ELICIT experimentation, we seek to explain further why certain configurations of trust and organizational type perform better than others. That is, we are interested in the factors that explain why an Edge organization with high levels of trust performs better than a Hierarchy organization with high levels of trust or an Edge organization with low levels of trust. We examine survey results from a questionnaire...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *ORGANIZATIONS, *COMPUTERIZED SIMULATION,...
Defense Technical Information Archive
by Defense Technical Information Center
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This project aimed at modeling future trajectories of irregular warfare (IW) through multiagent social simulation. The project objectives were to use social science to understand the social and political landscapes of IW; create a high-fidelity multiagent social simulation model (LRG-AFG) of the co-evolution of insurgency and counterinsurgency (COIN), embedded in a realistic and theoretically informed model of the local social, political, and economic landscapes; build an understanding of...
Topics: DTIC Archive, GEORGE MASON UNIV FAIRFAX VA, *COMPUTERIZED SIMULATION, *SOCIAL SCIENCES,...
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by Defense Technical Information Center
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In May 2011, The Games for Health Project, an effort organized by Digitalmill, Inc. with funding from the Robert Wood Johnson Foundation held its 7th Annual Games for Health Conference. This three day event brought together over 400 researchers, videogame developers, health professionals and health stakeholders including military, government, private sector, and foundational interests to discuss a wide range of issues, best practices, and research findings concerning the use of videogame media,...
Topics: DTIC Archive, DIGITAL MILL INC PORTLAND ME, *COMPUTER GAMES, *MEDICAL RESEARCH, *VIDEO RECORDING,...
Defense Technical Information Archive
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A computer simulation of combat is used to compare outcomes of a red tank attack on a blue defense for variations in mass (density) and firepower. Results suggest the defender's need for improvements in fire power to counterbalance the attacker's advantage gained by massing his forces.
Topics: DTIC Archive, Blumenthal, D K, LAWRENCE LIVERMORE NATIONAL LAB CA, *COMPUTERIZED SIMULATION,...
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by Defense Technical Information Center
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Stream water quality modeling is applied to a practical case showing impact analysis regarding future alternative land use. (Author)
Topics: DTIC Archive, Abbott,Jess, HYDROLOGIC ENGINEERING CENTER DAVIS CA, *WATER QUALITY, COMPUTERIZED...
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by Defense Technical Information Center
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This volume describes a methodology for performing airport landside planning by applying the Airport Landside Simulation Model (ALSIM) developed by TSC. For this analysis, the airport landside is defined as extending from the airport boundary to the aircraft gate. The model routes simulated enplaning and deplaning passenger groups through a series of essential processing facilities. At the simulated facilities, queueing and service processes are modeled. Flow, queueing time, queue length, and...
Topics: DTIC Archive, McCabe,L, TRANSPORTATION SYSTEMS CENTER CAMBRIDGE MA, *Airports, Planning,...
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This viewgraph presentation reviews the use of simulation and modeling in preparation for the planned exploration initiatives. The Exploration Systems Mission Directorate (EMSD) Integrated Modeling and Simulation (IM&S) team strategy encompasses a wide spectrum of simulation and modeling policies and technologies. One prominent technology is distributed simulation. The DIstributed Simulation (DIS),a collaborative simulation project with international participation (US and Japan) is reviewed...
Topics: NASA Technical Reports Server (NTRS), MODELS, SPACE EXPLORATION, DISTRIBUTED PROCESSING,...
Defense Technical Information Archive
by Defense Technical Information Center
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This document describes subroutines (link library source listings) pertaining to Interactive Visual Simulation of Communication Systems.
Topics: DTIC Archive, LINKNET ROLLING HILLS ESTATES CA, *INTERACTIVE GRAPHICS, *COMPUTERIZED SIMULATION,...
How to integrate simulation-based engineering and science (SBES) into the science curriculum smoothly is a challenging question. For the importance of SBES to be appreciated, the core value of simulations-that they help people understand natural phenomena and solve engineering problems-must be taught. A strategy to achieve this goal is to introduce computational experiments to the science curriculum to replace or supplement textbook illustrations and exercises and to complement or frame...
Topics: NASA Technical Reports Server (NTRS), EDUCATION, COMPUTERIZED SIMULATION, ENGINEERING, EXPERIMENT...
The ERDA/NASA 100 kW experimental wind turbine is modeled on a digital computer in order to study the performance of a wind turbine under operating conditions. Simulation studies of starting, overspeed, and shutdown performance were made. From these studies operating procedures, precautions, and limitations are prescribed.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, WINDMILLS (WINDPOWERED MACHINES),...
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...
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by Defense Technical Information Center
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The non-uniform (non-linear) equilibria of the classical (short circuit) Pierce diode and the extended (series RLC external circuit) Pierce diode are described theoretically, and explored via computer simulation. It is found that most equilibria are correctly predicted by theory, but that the continuous set of equilibria of the classical Pierce diode at alpha = 2 pi are not observed. The stability characteristics of the non-uniform equilibria are also worked out, and are consistent with the...
Topics: DTIC Archive, Lawson, William S, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *COMPUTERIZED...
The objective of NSRP Project 1-96-6 was to develop a methodology to identify specific processes within Steel Fabrication and Subassembly that were good candidates for automation, and to determine the degree and mix of automation which would have the best overall effect on the defined areas. Because of the large scope of the project, computer simulation was used to model the focus areas. Computer simulation lends itself well to investigations such as this because of software s capability to:...
Topics: DTIC Archive, NATIONAL STEEL AND SHIPBUILDING CO SAN DIEGO CA, *AUTOMATION, *SHIPBUILDING, COMPUTER...
Major watershed simulation models were implemented on the computer system at NASA Goddard Space Flight Center, and their operation was verified. Historical and physiographic data were acquired for two Maryland river basins (Monocasy River above Jug Bridge and Patuxent River near Laurel, Maryland) and the models were calibrated to simulate them. GSFC personnel were instructed in model operation after the models were implemented.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, ENVIRONMENT MODELS, HYDROLOGY,...
Positioning systems based upon electrstatic forces are being developed for the containerless processing of materials that cannot use acoustic or electromagnetic positioning techniques. Currently, electrode configurations for these electrostatic systems are designed on the basis of approximate analytical calculations and past experience. A three dimensional computer model is being developed that will predict the electrostatic fields and forces for a given electrode configuration and will allow...
Topics: NASA Technical Reports Server (NTRS), ACOUSTIC LEVITATION, ELECTRIC FIELDS, ELECTROSTATICS,...
In an effort to give students a more visceral experience of science and instill a deeper working knowledge of concepts, activities that utilize hands-on, laboratory and simulated experiences are recommended because these activities have a greater impact on student learning, especially for Native American students. Because it is not usually feasible to take large and/or multiple classes of high school science students into the field to count numbers of organisms of a particular species,...
Topics: NASA Technical Reports Server (NTRS), ENVIRONMENT SIMULATION, COMPUTERIZED SIMULATION, GRAPHS...
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Cincinnati, Ohio s TechnoSoft Inc. is a leading provider of object-oriented modeling and simulation technology used for commercial and defense applications. With funding from Small Business Innovation Research (SBIR) contracts issued by Langley Research Center, the company continued development on its adaptive modeling language, or AML, originally created for the U.S. Air Force. TechnoSoft then created what is now known as its Integrated Design and Engineering Analysis Environment, or IDEA,...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, COMPUTER AIDED DESIGN, AIRCRAFT...
Defense Technical Information Archive
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During constructive and virtual training and experimentation, circumstances exist when human intervention is required to override the outcomes of the computer simulation or to change the state of the simulation. Some examples of human intervention include adjudication of engagements having unreasonable outcomes, changing supply levels, and moving units or individual entities within the battlespace. Overriding the simulation results during event execution should not be a spontaneous decision. If...
Topics: DTIC Archive, ARMY MANEUVER CENTER OF EXCELLENCE FORT BENNING GA MANEUVER BATTLE LAB, *COMPUTERIZED...
During the summer of 1998, a group of independent experts was convened at the request of the President of the Institute for Defense Analyses to review IDA's work in developing the computer-based simulation game known as Synthetic Environments for National Security Estimates (SENSE). These experts were selected because of their recognized credentials in the fields of macroeconomics, the economics of transition economies, psychology and conflict resolution, and on-the-ground international aid...
Topics: DTIC Archive, Almon, Clopper, INSTITUTE FOR DEFENSE ANALYSES ALEXANDRIA VA, *COMPUTERIZED...
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Barrier synchronization is fundamental operation in parallel computation. In many contexts, at the point a processor enters a barrier it knows that it has already processed all the work required of it prior to synchronization. The alternative case, when a processor cannot enter a barrier with the assurance that it has already performed all the necessary pre-synchronization computation, is treated. The problem arises when the number of pre-sychronization messages to be received by a processor is...
Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, COMPUTATION, PARALLEL PROCESSING (COMPUTERS),...
The use is described of a successful large-signal, two-dimensional (axisymmetric), deformable disk computer model of the helical traveling wave tube amplifier, an extensively revised and operationally simplified version. We also discuss program input and output and the auxiliary files necessary for operation. Included is a sample problem and its input data and output results. Interested parties may now obtain from the author the FORTRAN source code, auxiliary files, and sample input data on a...
Topics: NASA Technical Reports Server (NTRS), APPLICATIONS PROGRAMS (COMPUTERS), COMPUTERIZED SIMULATION,...
Defense Technical Information Archive
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We question the widespread assumption that linguistic theory should guide the formulation of mechanistic accounts of human language processing. We develop a pseudo-linguistic theory for the domain of linguistic stress, based on observation of the learning behavior of a perceptron exposed to a variety of stress patterns. There are significant similarities between our analysis of perceptron stress learning and metrical phonology, the linguistic theory of human stress. Both approaches attempt to...
Topics: DTIC Archive, Gupta, Prahlad, CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF COMPUTER SCIENCE,...
NASA Network Resource and Training Site
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A shuttle-attached manipulator is currently proposed as the payload-handling device for the space shuttle. Basic requirements for the manipulator involve length, force, compliance, and control. Approaches for studying control methods are presented and simulation methods are discussed. Basic details about the two earthbased manipulators selected for simulation experiments are related to the test methods. Preliminary data from one test are shown as an example of the direction of the testing. A...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, MANIPULATORS, SPACE SHUTTLES,...
Defense Technical Information Archive
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This report is a user's guide for the Engine Maintenance Systems Evaluation (EnMasse). EnMasse is a simulation model based on Extend software and used in the analysis of alternative Jet Engine Intermediate Maintenance (JEIM) policies. The result of the policy analysis conducted using EnMasse is reported in a companion document, Supporting Expeditionary Aerospace Forces: Alternatives for Jet Engine Intermediate Maintenance, MR-1431-AF, 2002. The goal of the analysis was to evaluate several...
Topics: DTIC Archive, Amouzegar, Mahyar A, RAND CORP SANTA MONICA CA, *COMPUTERIZED SIMULATION, *AIRCRAFT...
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Ricin is a cytotoxin and a known bioterrorist weapon. The Army is pursuing anti-ricin vaccines, but plans to develop an efficacious antidote to the toxin, for cases where vaccination is not appropriate. The goal of this project is use the X-ray structure of ricin A chain (RTA) as a template for inhibitor design. Computer modeling and X-ray screening aid in the design process. Inhibitors which bind to the RTA substrate specificity site have been identified. A previous platform, 9-oxoguanine, has...
Topics: DTIC Archive, Robertus, Jon D, TEXAS UNIV AT AUSTIN, *ANTIDOTES, *RICIN, COMPUTERIZED SIMULATION,...
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Learning can be increasingly untethered to home, work or school spaces by means of integrative cloud services coupled with 3D worlds, and mobile, collaboratively driven use of digital third space. A 3rd-space, portable and modular design is described and demonstrated for use in administering and supporting learning in 3D. 3rd-space environments can be designed for enabling multi-purpose, multifunctional devices and tools for learner-centered design and collaborative social learning. The...
Topics: DTIC Archive, AIR UNIV MAXWELL AFB AL, *VIRTUAL REALITY, *COMPUTER AIDED INSTRUCTION, LEARNING,...
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Stream water quality modeling is applied to a practical case showing impact analysis regarding future alternative land use. (Author)
Topics: DTIC Archive, Abbott,Jess, HYDROLOGIC ENGINEERING CENTER DAVIS CA, *WATER QUALITY, COMPUTERIZED...
Defense Technical Information Archive
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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,...
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A modified version of the Aerospace Vehicle Synthesis Program (VSP) to simulate a space shuttle on the computer is presented. The effects of various changes such as payload weight, and orbital velocity can be determined along with minimum costs in vehicle design. The program logic, and weight estimating equations are discussed, and an example case of a solid propellant boosted, drop tank orbiter is included to indicate the type of results produced by the VSP.
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, SPACE SHUTTLES,...
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FEM software available to the Mechanical Systems Analysis and Simulation Branch at Goddard Space Flight Center (GSFC) include: 1) MSC/Nastran; 2) Abaqus; 3) Ansys/Multiphysics; 4) COSMOS/M; 5) 'Home-grown' programs; 6) Pre/post processors such as Patran and FEMAP. This viewgraph presentation provides additional information on MSC/Nastran and Ansys/Multiphysics, and includes screen shots of analyzed equipment, including the Wilkinson Microwave Anistropy Probe, a micro-mirror, a MEMS tunable...
Topics: NASA Technical Reports Server (NTRS), FINITE ELEMENT METHOD, APPLICATIONS PROGRAMS (COMPUTERS),...
This annual report covers the period from Oct 1, 2000 to Sep 30, 2001. The Astrophysics Plasma Emission Code and Database (APEC/APED), developed in part under this grant, have been upgraded to Version 1.1 and are now beginning to be used outside our research group in applications to X-ray spectral data from Chandra and XMM-Newton. These models represent the best theoretical data currently available and are reasonably complete below about 30 angstroms. Stellar coronae are being used to benchmark...
Topics: NASA Technical Reports Server (NTRS), DATA BASES, SPECTROSCOPY, COMPUTERIZED SIMULATION, SPECTRAL...
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The computer programs to design synthetic pathways of organic compounds have been utilized throughout the world since the first system was reported by Corey in 1969, and the LHASA was reported in1972 to become the predominant system. Many programs have been reported mainly in the United States and Europe, and groups of corporations, especially chemical companies, have been trying to improve programs and increase the efficiency of research. In Japan, unfortunately, no concrete movement in this...
Topics: NASA Technical Reports Server (NTRS), COMPUTER AIDED DESIGN, COMPUTERIZED SIMULATION, HYDROCARBONS,...
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What tools should we provide the user for defining and interacting with objects and agents in virtual environments at varying levels of complexity? Understanding the appropriate simplifications to make is critical for modeling nontrivial environments and agents with varying levels of autonomy. I describe a set of abstraction mechanisms appropriate for constructing and interacting with virtual worlds, and I discuss how programming, and direct manipulation of guiding techniques, can be used to...
Topics: NASA Technical Reports Server (NTRS), MAN MACHINE SYSTEMS, ROBOT CONTROL, TELEOPERATORS,...
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SLAB is a software system that can be run on a personal computer to simulate an acoustic environment in real time. SLAB was developed to enable computational experimentation in which one can exert low-level control over a variety of signal-processing parameters, related to spatialization, for conducting psychoacoustic studies. Among the parameters that can be manipulated are the number and position of reflections, the fidelity (that is, the number of taps in finite-impulse-response filters),...
Topics: NASA Technical Reports Server (NTRS), ACOUSTICS, SIGNAL PROCESSING, COMPUTER PROGRAMMING,...
Defense Technical Information Archive
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The Air Force is investigating the use of three levels of aircraft maintenance. This work examines the effect of maintenance resource collaboration and a centralized repair facility on a critical line replacement unit for a major Air Force weapon system. Maintenance data is collected, summarized into probability distributions and used in a discrete event simulation model to examine the impact of changes to the Air Force hierarchical maintenance structure.
Topics: DTIC Archive, AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH, *AIRCRAFT MAINTENANCE, *COMPUTERIZED...
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A software simulator was developed to help in the design of the LMSS. The simulator is used to study the characteristics and implementation requirements of the LMSS' configuration.
Topics: NASA Technical Reports Server (NTRS), PORTABLE EQUIPMENT, TELEPHONES, COMPUTER PROGRAMS,...
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Kharkov modeling is a modeling technique that is widely useful for dependability analysis of complex fault tolerant systems. It is very flexible in the type of systems and system behavior it can model. It is not, however, the most appropriate modeling technique for every modeling situation. The first task in obtaining a reliability or availability estimate for a system is selecting which modeling technique is most appropriate to the situation at hand. A person performing a dependability...
Topics: NASA Technical Reports Server (NTRS), MARKOV PROCESSES, COMPUTERIZED SIMULATION, RELIABILITY,...
With increasing proliferation of virtual environments for serious work as well as play, we are confronted by new challenges pertaining to how such environments can be leveraged to promote and induce effective work performance. In terms of organization and management, we are challenged further by decisions regarding which work activities to perform in virtual environments versus their physical counterparts; our level of understanding remains relatively primitive, and the literature remains...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *COMPUTERIZED SIMULATION, *PERFORMANCE(HUMAN),...
This thesis reports on three procedures and the associated numerical results for obtaining semiconductor majority carrier concentrations when subjected to a temperature sweep. The capability of predicting the exhaustion regime boundaries of a semiconductor is critical in understanding and exploiting the full potential of the modern integrated circuit. An efficient and reliable method is needed to accomplish this task. Silvaco International's semiconductor simulation software was used to predict...
Topics: DTIC Archive, Reeves, Derek E, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *SEMICONDUCTORS, COMPUTERIZED...
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This is the fifth quarterly report for the project: Computational Models of Human Organizatic Dynamics. This report covers the period from 3/1/98 through 5131/98. Our annual report covers the period from 3/1/97-2/28/98, and so includes the fourth-quarter material. Progress During Reporting Period During this project period we reviewed our progress on the mapping, modeling, and analys technologies we have been developing, with an eye to defining shortfalls and thus defining future directions. We...
Topics: DTIC Archive, Courand, Gregg, SYNERGIA REDWOOD CITY CA, *COMPUTERIZED SIMULATION, *HUMANS,...
Defense Technical Information Archive
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Inundation that results from tropical storms and hurricanes significantly impact coastal communities. The ability to predict the extent of surge and inundation is essential for evacuation orders, disaster response preparation, and resource planning. In this study we validate the DELFT3D modeling suite comprised of FLOW and WAVE modules to model inundation caused by Hurricane Ike (2008) using reanalyzed data. Model results are compared to the data collected by the SURA coastal inundation...
Topics: DTIC Archive, NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV,...
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A SAMICS (Solar Array Manufacturing Industry Costing Standards) was formulated as a computer simulation model. Given a proper description of the manufacturing technology as input, this model computes the manufacturing price of solar arrays for a broad range of production levels. This report presents a model for computing these marketing and distribution costs, the end point of the model being the loading dock of the final manufacturer.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, DISTRIBUTING, MARKETING, SOLAR...
This research has pursued a proof of concept prototype, named the CONOPS Navigator. The Navigator is intended to provide a 3D virtual guide through the development of a CONOPS, and also to integrate various tools and applications currently in use. This integration is a widely-sought capability, one which will enable current CONOPS developers and users the flexibility to import and export analysis parameters and results to and from various familiar and well-used tools. Legacy systems are a fact...
Topics: DTIC Archive, SYSTEMS ENGINEERING RESEARCH CENTER HOBOKEN NJ, *SYSTEMS ENGINEERING, COMPUTER...
This report will present two commercial software environments used to distribute and execute real-time simulations: QuaRC and RT-Lab. Both QuaRC and RT-Lab allow the user to develop simulation models using Matlab/Simulink and include hardware, such as data acquisition boards, to connect to real vehicles and systems. In addition, QuaRC can be used to program embedded systems such as wheeled mobile robots and aerial vehicles. This report will present formation flight models that have been...
Topics: DTIC Archive, NUMERICA TECHNOLOGIES INC QUEBEC CITY (CANADA), *COMPUTERIZED SIMULATION, *HARDWARE...
Hypervelocity impact tests were conducted to simulate the damage that meteoroids will produce in the Shuttle Orbiter leading edge structural subsystem material. The nature and extent of the damage is reported and the probability of encountering meteoroids with sufficient energy to produce such damage is discussed.
Topics: NASA Technical Reports Server (NTRS), IMPACT DAMAGE, METEOROIDS, SPACE SHUTTLES, COMPUTERIZED...
Defense Technical Information Archive
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This volume reports on techniques currently used for verifying and validating computer programs and software systems. It also contains an analysis of the effect that structured programming technology will have on these techniques. This analysis addressed all phases of software development - definition, design, implementation, and evaluation.
Topics: DTIC Archive, Smith, Ronald L, IBM FEDERAL SYSTEMS CENTER GAITHERSBURG MD, *COMPUTER PROGRAMMING,...
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In contemporary operations, asymmetric threats, especially Improvised Explosive Devices (IEDs), are a leading cause of Canadian Forces casualties and injuries. Automation to support the development of better threat scenarios for training exercises would improve the Canadian Forces' capability to prepare soldiers for future missions involving emerging threats. This report summarizes progress to date on the design of a software tool to automate the generation of plausible IED threat scenarios....
Topics: DTIC Archive, CAE PROFESSIONAL SERVICES OTTAWA (ONTARIO), *IMPROVISED EXPLOSIVE DEVICES,...
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An interactive cell modeling web site, iCell, that integrates research and education, was developed as a simulation-based teaching and leaning tool for electrophysiology. The site consists of JAVA applets representing models of various cardiac cells and neurons, and provides simulation data of their bioelectric activities at cellular level. Each JAVA-based model allows the user to go through menu options to change model parameters, run and view simulation results. The site also has a glossary...
Topics: DTIC Archive, Demir, Semahat S, MEMPHIS UNIV TN, *COMPUTER PROGRAMS, *TRAINING, *ELECTROPHYSIOLOGY,...
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Recent advances in high-performance computing have pushed computational capabilities to a petaflop (a thousand trillion operations per second) in a single computing cluster. This breakthrough has been hailed as a way to fundamentally change science and engineering by letting people perform experiments that were previously beyond reach. But for those interested in exploring the I/O behavior of their simulation model, efficient experimental design has a much higher payoff at a much lower cost. A...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OPERATIONS RESEARCH, *EXPERIMENTAL...
Defense Technical Information Archive
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Many animals, ranging from bacteria, through nematodes, to insects, fish and mammals, use air- or water-borne plumes of odor molecules to locate distant unseen resources. We have used our knowledge of the well studied pheromone plume tracking behavior of male moths, as the foundation for simulation and robotic experiments aimed at learning more about the mechanisms underlying biological systems. We extended this knowledge to engineering approaches to generate an autonomous artificial agent that...
Topics: DTIC Archive, Willis, Mark A, ARIZONA RESEARCH LABS TUCSON, *COMPUTERIZED SIMULATION, *ROBOTICS,...
A flexible and easy to use microcomputer program has been developed to predict the damage to facilities resulting from the effects of conventional explosions. This High Explosive Damage Assessment Model (HIXDAK) is intended to provide safety engineering offices and facility designers a tool for rapid evaluation of airblast damage to structures. The model was first reported at the 1988 Explosive Safety Seminar and has received widespread distribution within the U. S . Government and industry....
Topics: DTIC Archive, CORPS OF ENGINEERS HUNTSVILLE AL, *HIGH EXPLOSIVES, *MICROCOMPUTERS, *DAMAGE...
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In 2010, the Navy formally added the Damage Control Trainer (DCT) to the recruit training program at Great Lakes, Illinois. Despite the incredibly dense training schedule at the Navy's boot camp, the instructors were willing to set aside two hours of time for recruits to play a game. Why? Because it worked. Even with just one hour of play, research showed that recruits gained a 50-80% improvement in performance that transferred to Battle Stations 21 (B821), the Navy's capstone training event....
Topics: NASA Technical Reports Server (NTRS), EDUCATION, GAMES, TRAINING DEVICES, LEARNING THEORY, NAVY,...
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,...
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The usage model of supercomputers for scientific applications, such as computational fluid dynamics (CFD), has changed over the years. Scientific visualization has moved scientists away from looking at numbers to looking at three-dimensional images, which capture the meaning of the data. This change has impacted the system models for computing. This report details the model which is used by scientists at NASA's research centers.
Topics: NASA Technical Reports Server (NTRS), COMPUTATIONAL FLUID DYNAMICS, SCIENTIFIC VISUALIZATION,...
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1 CFFTS trains Air Combat Systems Officers (ACSO) and Airborne Electronic Sensor Operators (AESOp). The operation of the school is stochastic and dynamic in nature and a resource allocation planning tool has been built to simulate the interactions of its various components. For example, it takes into account weather, aircraft reliability, instructor availability and student failure. This presentation gives an overview of the school's operation, describes how it is simulated with a custom built...
Topics: DTIC Archive, DEFENCE RESEARCH AND DEVELOPMENT CANADA WINNIPEG (CANADA), *SCHOOLS, CANADA,...
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A particle simulation study demonstrates that an initial-value analysis is essential in understanding the early-time growth of diocotron modes. It is also demonstrated that the equilibrium properties of a rigid rotor (including rotation on both the high and the low frequency branches) are well described by particle simulation.
Topics: DTIC Archive, Neu, S C, CALIFORNIA UNIV LOS ANGELES PLASMA PHYSICS GROUP, *COMPUTERIZED SIMULATION,...
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,...
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Models constitute an important component in decision support functions of C4I systems. They improve the military commander's abilities to create situation awareness, analyse threats and make proper decisions. Computerized models can be exploited for the purpose of simulation, which enables us to cover a much wider range of options and go deeper in impact assessments. In this paper we describe decision support and simulation techniques to facilitate Effects-Based Planning (EBP). In our approach,...
Topics: DTIC Archive, SWEDISH DEFENCE RESEARCH AGENCY STOCKHOLM, *DECISION SUPPORT SYSTEMS, COMPUTERIZED...
The authors have extended the application of double circular-arc helical gears for internal gear drives. The geometry of the pinion and gear tooth surfaces has been determined. The influence of errors of alignment on the transmission errors and the shift of the bearing contact have been investigated. Application of a predesigned parabolic function for the reduction of transmission errors was proposed. Methods of grinding of the pinion-gear tooth surfaces by a disk-shaped tool and a grinding...
Topics: NASA Technical Reports Server (NTRS), GEARS, GEAR TEETH, MECHANICAL DRIVES, COMPUTERIZED...
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This report documents the analysis of the Ride Motion Simulator (RMS) designed for the U.S. Army Tank Automotive and Armaments Command (TACOM) in Warren, Michigan. It provides system and component descriptions and a specific hazard analysis of the RMS. The scope of this analysis is the systematic assessment of the real and potential hazards associated with the RMS. This report is an attempt to identify hazards and to discuss the elimination or control of the identified hazards. This...
Topics: DTIC Archive, MTS SYSTEMS CORP MINNEAPOLIS MN, *COMPUTERIZED SIMULATION, *VIBRATION, *TANKS(COMBAT...
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Previous studies have shown that satellite servicing is cost effective; however, all of these studies were of different formats, dollar year, learning rates, availability, etc. Therefore, it was difficult to correlate any useful trends from these studies. The reviewed study was initiated to correlate the economic data into a common data base, using a common set of assumptions. A selected set of existed funded programs was then analyzed to provide an independent analysis of the servicing options...
Topics: NASA Technical Reports Server (NTRS), DATA BASES, ECONOMICS, SPACECRAFT MAINTENANCE, AVAILABILITY,...
A computer program which simulates the complex processes of photooxidation which take place in a polymer upon prolonged exposure outdoors causing it to fail in photovoltaic and other applications. The method calculates from an input data set of elementary reactions and rates the concentration profiles of all species over time.
Topics: NASA Technical Reports Server (NTRS), PHOTOOXIDATION, POLYMERIZATION, SOLAR CELLS, COMPUTERIZED...
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B-K Dynamics activities during the first quarter (28 October 1974 to 15 January 1975) have been focused on two major areas: STINGER simulation preparation and PDDAIOS installation. This report summarizes the work performed by BKD during the above period and outlines accomplishments and plans for the next quarter. No attempt has been made to document software generated during the period since all programs described are being continually upgraded. Current listings, flow charts and program decks...
Topics: DTIC Archive, B-K DYNAMICS INC ROCKVILLE MD, *COMPUTERIZED SIMULATION, *ANTIAIRCRAFT MISSILES,...
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This report provides a summary of the progress made during the report period under TASC's three ASTT (Advanced Simulation Technology Thrust) projects: (1) MRA (Multiresolution Analysis), CLIN 0001/0002, whitney; (2) JETS (JSIMS Environmental Tailoring), CLIN 0003/0004, Ouzts; and (3) FROST (Framework of Reusable Objects), CLIN 0005/0006, Stanzione. This report contains both Technical (Section 2) and Management / Financial (Section 3) status information, reported individually for each of the...
Topics: DTIC Archive, Ouzts, Steve, ANALYTIC SCIENCES CORP READING MA, *COMPUTERIZED SIMULATION, DATA...
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In the past year, we have successfully developed the techniques necessary to conduct impact experiments on ice at very low temperatures. We employ the method of embedding gauges within a target to measure the shock wave and material properties. This means that our data are not model dependent; we directly measure the essential parameters needed for numerical simulations of impact cratering. Since then we have developed a new method for temperature control of icy targets that ensures temperature...
Topics: NASA Technical Reports Server (NTRS), ICE, COMPUTERIZED SIMULATION, IMPACT TESTS, SHOCK WAVES,...
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With the interest in jet propulsion at the end of World War II, aerodynamicists were challenged to develop mathematical models which could be used to design turbomachinery components for jets. NASA Lewis engineers and scientists played a major role in meeting this challenge. Some of their accomplishments are highlighted as well as those of others. Several problems are addressed which must be solved if jet propulsion technology is to advance.
Topics: NASA Technical Reports Server (NTRS), FLOW DISTRIBUTION, JET PROPULSION, MATHEMATICAL MODELS,...