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NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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NASA's Jet Propulsion Laboratory has developed a computer model for planning future health care needs in the Los Angeles area. The model integrates demographic health and other data to provide rational projections of hospital bed and physician specialty requirements.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, HEALTH, HOSPITALS, PHYSICIANS
NASA Network Resource and Training Site
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Being "lost" is an exemplar of imperfect Situation Awareness/Situation Understanding (SA/SU) -- information/knowledge that is uncertain, incomplete, and/or just wrong. Being "lost" may be a geo-spatial condition - not knowing/being wrong about where to go or how to get there. More broadly, being "lost" can serve as a metaphor for uncertainty and/or inaccuracy - not knowing/being wrong about how one fits into a larger world view, what one wants to do, or how to do...
Topics: NASA Technical Reports Server (NTRS), SITUATIONAL AWARENESS, COMPUTERIZED SIMULATION, VIRTUAL...
The Applied Meteorology Unit (AMU) evaluated the Regional Atmospheric Modeling System (RAMS) contained within the Eastern Range Dispersion Assessment System (ERDAS). ERDAS provides emergency response guidance for Cape Canaveral Air Force Station and Kennedy Space Center operations in the event of an accidental hazardous material release or aborted vehicle launch. The RAMS prognostic data are available to ERDAS for display and are used to initialize the 45th Space Wing/Range Safety dispersion...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC MODELS, WEATHER FORECASTING, COMPUTERIZED...
A frequency sub-band based adaptive spectral subtraction algorithm is developed to remove noise from noise-corrupted speech signals. A single microphone is used to obtain both the noise-corrupted speech and the estimate of the statistics of the noise. The statistics of the noise are estimated during time frames that do not contain speech. These statistics are used to determine if future time frames contain speech. During speech time frames, the algorithm determines which frequency sub-bands...
Topics: NASA Technical Reports Server (NTRS), NOISE REDUCTION, SIGNAL PROCESSING, COMPUTERIZED SIMULATION,...
A self-consistent computer code for particle simulations which could treat both Landau and cyclotron interactions is discussed.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, ELECTRIC FIELDS, PARTICLE...
To determine how dilution of microbial communities affects the diversity of the diluted assemblage a series of numerical simulations were conducted that determined the theoretical change in diversity, richness, and evenness of the community with serial dilution. The results of the simulation suggested that the effects are non linear with a high degree of dependence on the initial evenness of the community being diluted. A series of incubation experiments using a range of dilutions of raw sewage...
Topics: NASA Technical Reports Server (NTRS), DILUTION, MICROORGANISMS, COMPUTERIZED SIMULATION,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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The Coastal Center and the NASA Biomedical Team are working together to adapt a suspension device that simulates weightlessness. Attempts to approximate weightlessness have led astronauts underwater and into harnesses that suspend all or part of their weight. One such device, built at Langley Research Center, is being transferred to rehabilitation work. It can help a person walk and re-learn muscular coordination following a stroke. Hospitals could use it to lift handicapped persons.
Topics: NASA Technical Reports Server (NTRS), GRAVITATION, COMPUTERIZED SIMULATION, MECHANICAL DEVICES,...
A catalog is presented of subsystem and environment math models used or planned for space shuttle simulations. The purpose is to facilitate sharing of similar math models between shuttle simulations. It provides information on mach model requirements, formulations, schedules, and contact persons for further information.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, MATHEMATICAL MODELS, SPACE SHUTTLES,...
The computerized design, methods for generation, simulation of meshing, and enhanced stress analysis of modified involute helical gears is presented. The approaches proposed for modification of conventional involute helical gears are based on conjugation of double-crowned pinion with a conventional helical involute gear. Double-crowning of the pinion means deviation of cross-profile from an involute one and deviation in longitudinal direction from a helicoid surface. Using the method developed,...
Topics: NASA Technical Reports Server (NTRS), COMPUTER AIDED DESIGN, GEARS, STRESS ANALYSIS, COMPUTERIZED...
Flight simulators can be designed to train pilots or assess their flight performance. Low-Fidelity simulators maximize the initial learning rate of novice pilots and minimize initial costs; whereas, expensive, high-fidelity simulators predict the realworld in-flight performance of expert pilots (Fink & Shriver, 1978 Hays & Singer 1989; Kinkade & Wheaton. 1972). Although intuitively appealing and intellectually convenient to generalize concepts of learning and assessment, what holds...
Topics: NASA Technical Reports Server (NTRS), FLIGHT SIMULATORS, EDUCATION, AERONAUTICS, COMPUTERIZED...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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In 1984, researchers from Ames Research Center came together to develop advanced human interfaces for NASA s teleoperations that would come to be known as "virtual reality." The basis of the work theorized that if the sensory interfaces met a certain threshold and sufficiently supported each other, then the operator would feel present in the remote/synthetic environment, rather than present in their physical location. Twenty years later, this prolific research continues to pay...
Topics: NASA Technical Reports Server (NTRS), HEARING, TELEOPERATORS, COMPUTERIZED SIMULATION, VIRTUAL...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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Topics on the slide include:quality, test coverage, functional criticality, exposure, criticality, and risk index.
Topics: NASA Technical Reports Server (NTRS), MODELS, RISK, COMPUTER PROGRAMS, COMPUTERIZED SIMULATION,...
An investigation into the application of an observer based sliding mode controller for robust control of a highly unstable aircraft and methods of compensating for actuator dynamics is performed. After a brief overview of some reconfigurable controllers, sliding mode control (SMC) is selected because of its invariance properties and lack of need for parameter identification. SMC is reviewed and issues with parasitic dynamics, which cause system instability, are addressed. Utilizing sliding...
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT CONTROL, AIRCRAFT STABILITY, ACTUATORS, COMPUTERIZED...
The feasibility is evaluated of an evolutionary development for use of a single-axis gimbal star tracker from prior two-axis gimbal star tracker based system applications. Detailed evaluation of the star tracker gimbal encoder is considered. A brief system description is given including the aspects of tracker evolution and encoder evaluation. System analysis includes evaluation of star availability and mounting constraints for the geosynchronous orbit application, and a covariance simulation...
Topics: NASA Technical Reports Server (NTRS), ATTITUDE INDICATORS, GIMBALS, STAR TRACKERS, COMPUTER...
Differential Evolution is a simple, fast, and robust evolutionary algorithm that has proven effective in determining the global optimum for several difficult single-objective optimization problems. In this paper, the Differential Evolution algorithm is extended to multiobjective optimization problems by using a Pareto-based approach. The algorithm performs well when applied to several test optimization problems from the literature.
Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, OPTIMIZATION, COMPUTERIZED SIMULATION, Madavan,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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Topics: NASA Technical Reports Server (NTRS), SUPERCOMPUTERS, NASA PROGRAMS, COMPUTERIZED SIMULATION,...
Some of the processes involved in the nucleation and growth of thin films were simulated by means of a digital computer. The simulation results were used to study the nucleation and growth kinetics resulting from the various processes. Kinetic results obtained for impingement, surface migration, impingement combined with surface migration, and with reevaporation are presented. A substantial fraction of the clusters may form directly upon impingement. Surface migration results in a decrease in...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, NUCLEATION, THIN FILMS, CRYSTAL...
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,...
The design, fabrication, testing, and evaluation of components for a modularized engineering prototype of a unified system for detection of life on Mars is summarized.
Topics: NASA Technical Reports Server (NTRS), EXTRATERRESTRIAL LIFE, MARS (PLANET), BIOLOGY, COMPUTERIZED...
The logistics of orbital vehicle servicing computer specifications was developed and a number of alternatives to improve utilization of the space shuttle and the tug were investigated. Preliminary results indicate that space servicing offers a potential for reducing future operational and program costs over ground refurbishment of satellites. A computer code which could be developed to simulate space servicing is presented.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, LOGISTICS, SPACE SHUTTLES, SPACE...
Current system simulations are mature, difficult to modify, and poorly documented. Probabilistic life prediction techniques for space applications are in their early application stage. Many parts of the full system, variable fidelity simulation, have been demonstrated individually or technology is available from aeronautical applications. A 20% reduction in time to design with improvements in performance and risk reduction is anticipated. GRC software development will proceed with similar...
Topics: NASA Technical Reports Server (NTRS), PREDICTION ANALYSIS TECHNIQUES, COMPUTERIZED SIMULATION,...
During the final year of this investigation we have finished several event studies that we considered necessary for the development of a tail magnetopause model and for the calibration of our simulation code. We have not reached the ultimate goal of the project, i.e., the development of an analytical tail magnetopause model. In the course of the investigation we have learned that such a model would be much more complex than we had anticipated. However, the investigations that we conducted...
Topics: NASA Technical Reports Server (NTRS), MAGNETOPAUSE, COMPUTERIZED SIMULATION, MODELS, MATHEMATICAL...
During the investigation we have finalized the event studies that are necessary for the development of the magnetopause model and for the calibration of our simulation code.
Topics: NASA Technical Reports Server (NTRS), MAGNETOPAUSE, COMPUTERIZED SIMULATION, MODELS, CALIBRATING,...
NASA Network Resource and Training Site
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This document summarizes the activities of the Goddard Earth Sciences and Technology Center (GEST), a consortium of scientists and engineers led by the University of Maryland, Baltimore County (UMBC), during the contract reporting period. Topics covered include: new programs, eligibility and selection criteria, Goddard Coastal Research Graduate Fellowship Program and staffing changes.
Topics: NASA Technical Reports Server (NTRS), STUDENTS, EDUCATION, UNIVERSITIES, EARTH SCIENCES,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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"Elizabeth," a computerized beauty analysis system marketed by Elizabeth Arden, is based upon an ARAC data base search of technologies measuring skin profiles. * "Elizabeth" is no longer commercially available.
Topics: NASA Technical Reports Server (NTRS), COMPUTER TECHNIQUES, DIAGNOSIS, SKIN (ANATOMY), DATA BASES,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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An aerodynamic bicycle wheel developed by two DuPont engineers and a California company incorporates research into NASA airfoils. Computer modeling was accomplished with MSC/NASTRAN. Each of the three spokes in the wheel is, in effect, an airfoil, maximizing aerodynamic efficiency for racing.
Topics: NASA Technical Reports Server (NTRS), WHEELS, AERODYNAMIC CHARACTERISTICS, RECREATION, COMPUTER...
Land surface models (LSMs) play a critical role in the simulation of climate, for they determine the character of a large fraction of the atmosphere's lower boundary. The LSM partitions the net radiative energy at the land surface into sensible heat, latent heat, and energy storage, and it partitions incident precipitation water into evaporation, runoff, and water storage. Numerous modeling experiments and the existing (though very scant) observational evidence suggest that variations in these...
Topics: NASA Technical Reports Server (NTRS), PARAMETERIZATION, COMPUTERIZED SIMULATION, DRAINAGE,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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This is a report of my activities as a NASA Fellow during the summer of 2003 at the NASA Kennedy Space Center (KSC). The core of these activities is the assigned project: the Virtual Test Bed (VTB) from the Spaceport Engineering and Technology Directorate. The VTB Project has its foundations in the NASA Ames Research Center (ARC) Intelligent Launch & Range Operations program (ILRO). The objective of the VTB project is to develop a unique collaborative computing environment where simulation...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, SYSTEMS SIMULATION, LAUNCHING BASES,...
The Kennedy Space Center (KSC) Electrostatics and Surface Physics Laboratory is participating in an Innovative Partnership Program (IPP) project with an industry partner to modify a commercial off-the-shelf simulation software product to treat the electrodynamics of particulate systems. Discrete element modeling (DEM) is a numerical technique that can track the dynamics of particle systems. This technique, which was introduced in 1979 for analysis of rock mechanics, was recently refined to...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, ELECTROSTATICS, CHARGED PARTICLES,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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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. Threfore, 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, COMPUTERIZED...
Its time: a) To bring planetary scientists, deflection system investigators and vehicle designers together on the characterization/mitigation problem. b) To develop a comprehensive trade space of options. c) To trade options under a common set of assumptions and see what comparisons on effectiveness can be made. d) To explore the synergy that can be had with proposed scientific and exploration architectures while interest in NEO's are at an all time high.
Topics: NASA Technical Reports Server (NTRS), DESIGN ANALYSIS, COMPUTERIZED SIMULATION, IDENTIFYING,...
This slide presentation reviews the internship assignment of the author and his work on the GFSSP among other assignments.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, FLUID FLOW, COMPUTER PROGRAMS,...
The equations of motion are developed which describe the dynamic interaction between the spacecraft bus and the movable appendages about a single axis. The effect is evaluated of the dynamic interaction on the attitude control subsystem with computer simulations, and design recommendations to reduce the impact of this interaction on future attitude control subsystems are presented.
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, MARINER SPACECRAFT, SPACECRAFT...
NASA Network Resource and Training Site
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We propose a new approach to performing ultrafast beam switching using two coupled Vertical-Cavity Surface-Emitting Lasers (VCSELs). The strategy is demonstrated by numerical simulation, showing a beam switching of 10 deg at 42 GHz.
Topics: NASA Technical Reports Server (NTRS), BEAM SWITCHING, COMPUTERIZED SIMULATION, SURFACE EMITTING...
A control model describing a network flow hindered by multiple pure time (or transport) delays is formulated. Feedbacks connect each desired output with a single control sector situated at the origin. The dynamic formulation invokes the use of differential difference equations. This causes the characteristic equation of the model to consist of transcendental functions instead of a common algebraic polynomial. A general graphical criterion is developed to evaluate the stability of such a...
Topics: NASA Technical Reports Server (NTRS), FEEDBACK CONTROL, NETWORK ANALYSIS, COMPUTERIZED SIMULATION,...
We explore the utility of various sensors by recovering parachute-probe dynamics information from a package released from a small-scale, remote-controlled airplane. The airdrops aid in the development of datasets for the exploration of planetary probe trajectory recovery algorithms, supplementing data collected from instrumented, full-scale tests and computer models.
Topics: NASA Technical Reports Server (NTRS), AIRDROPS, PARACHUTES, REMOTE CONTROL, TRAJECTORIES, FULL...
During this reporting period, all technical responsibilities were accomplished as planned. A close working relationship was maintained with personnel of the MSFC Avionics Department Software Group (ED14), the MSFC EXPRESS Project Office (FD31), and the Huntsville Boeing Company. Accomplishments included: performing special tasks; supporting Software Review Board (SRB), Avionics Test Bed (ATB), and EXPRESS Software Control Panel (ESCP) activities; participating in technical meetings; and...
Topics: NASA Technical Reports Server (NTRS), AVIONICS, COMPUTERIZED SIMULATION, SOFTWARE ENGINEERING,...
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...
Researchers at the NASA Glenn Research Center acquired a commodity cluster based on Intel Corporation processors to compare its performance with a traditional UNIX cluster in the execution of aeropropulsion applications. Since the cost differential of the clusters was significant, a cost/performance ratio was calculated. After executing a propulsion application on both clusters, the researchers demonstrated a 9.4 cost/performance ratio in favor of the Intel-based cluster. These researchers...
Topics: NASA Technical Reports Server (NTRS), SUPERCOMPUTERS, COMPUTER SYSTEMS PERFORMANCE, CENTRAL...
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A series of impact experiments on anhydrite CaSO4, in which vaporized sample accelerates an element in a velocity interferometer, generate velocity data that we have recently reanalyzed using an explicit entropy generating finite difference code. The shock pressure required from the onset, and complete vaporization of 30% porous and 70% crystal density anhydrite is 52 +/- 3 and 122 +/- 13 GPa. Using observed acid leaching in non-marine K/T ejecta in North America, and the sharp global increase...
Topics: NASA Technical Reports Server (NTRS), IMPACT TESTS, CALCIUM SILICATES, VAPORIZING, INTERFEROMETERS,...
This study examined different constellation configurations to determine their suitability for the Mars Network. Some variations on the baseline case of four circular orbits were initially studied. Eccentric orbits were then used to determine their effects on several figures of merit that were selected as representative of the design goals. It was eventually found that the use of eccentric orbits in combination with circular orbits can improve aspects of some navigation and communication figures...
Topics: NASA Technical Reports Server (NTRS), CIRCULAR ORBITS, SATELLITE CONSTELLATIONS, ECCENTRIC ORBITS,...
The Simulation Computer System (SCS) is the computer hardware, software, and workstations that will support the Payload Training Complex (PTC) at the Marshall Space Flight Center (MSFC). The PTC will train the space station payload scientists, station scientists, and ground controllers to operate the wide variety of experiments that will be on-board the Freedom Space Station. The further analysis performed on the SCS study as part of task 2-Perform Studies and Parametric Analysis-of the SCS...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, PAYLOAD STATIONS, PAYLOADS, SPACE...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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As a Jet Propulsion Laboratory astronomer, John D. Callahan developed a computer program called Multimission Interactive Planner (MIP) to help astronomers analyze scientific and optical data collected on the Voyager's Grand Tour. The commercial version of the program called XonVu is published by XonTech, Inc. Callahan has since developed two more advanced programs based on MIP technology, Grand Tour and Jovian Traveler, which simulate Voyager and Giotto missions. The software allows astronomers...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, ASTRONOMY, EDUCATION, NASA SPACE PROGRAMS,...
The earliest abort once around (AOA) time for the first orbital flight test (OFT-1) mission is determined. The latest estimates of vehicle weights and propulsion for OFT-1 are used. Trade analyses to indicate variations in AOA time for shuttle subsystem changes (such as orbital maneuvering system (OMS) or reaction control system (RCS) propellant loadings) are included. In addition, the effects of first stage attitude steering as a function of relative velocity for a nominal profile are...
Topics: NASA Technical Reports Server (NTRS), ABORT TRAJECTORIES, FLIGHT TESTS, SPACE SHUTTLES,...
NASA Network Resource and Training Site
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The robustness of detection filters applied to the detection of actuator failures on a free-free beam is analyzed. This analysis is based on computer simulation tests of the detection filters in the presence of different types of model mismatch, and on frequency response functions of the transfers corresponding to the model mismatch. The robustness of detection filters based on a model of the beam containing a large number of structural modes varied dramatically with the placement of some of...
Topics: NASA Technical Reports Server (NTRS), ACTUATORS, DETECTION, FAILURE ANALYSIS, FILTERS, ROBUSTNESS...
Because of the extreme expense involved in developing and flight testing meteorological instruments, an extensive series of numerical modeling experiments to simulate the performance of meteorological observing systems were performed on CYBER 205. The studies compare the relative importance of different global measurements of individual and composite systems of the meteorological variables needed to determine the state of the atmosphere. The assessments are made in terms of the systems ability...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, METEOROLOGICAL INSTRUMENTS,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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A NASA-developed meter and computer model offers the first verifiable way of measuring ride quality. It transforms individual noise and vibration elements into subjective units, then translates the units into a discomfort index. The meter was designed by Wyle Laboratories under NASA contract. It performs well and has been sold to major manufacturers.
Topics: NASA Technical Reports Server (NTRS), MATHEMATICAL MODELS, TECHNOLOGY UTILIZATION, MEASURING...
We developed techniques to predict application execution times for instance-based learning with an average error of 33% of average run time. We developed techniques to predict queue wait times that included a simulation of scheduling algorithms and execution time predictions. We implemented these techniques for the NAS Origin cluster.
Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, QUEUEING THEORY, MATHEMATICAL MODELS, SCHEDULING,...
The research supported under this award focuses on heterogeneous distributed computing for high-performance applications, with particular emphasis on computational aerosciences. The overall goal of this project was to and investigate issues in, and develop solutions to, efficient execution of computational aeroscience codes in heterogeneous concurrent computing environments. In particular, we worked in the context of the PVM[1] system and, subsequent to detailed conversion efforts and...
Topics: NASA Technical Reports Server (NTRS), AEROSPACE SCIENCES, COMPUTER PROGRAMS, HETEROGENEITY,...
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by NASA Technical Reports Server (NTRS)
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The objective of this study was to perform theoretical modeling of mechanical deformation of the Earth's lithosphere making use of analytical solutions as well as numerical computer simulations.
Topics: NASA Technical Reports Server (NTRS), LITHOSPHERE, DEFORMATION, MATHEMATICAL MODELS, COMPUTERIZED...
The general problem of gyro calibration can be stated as the estimation of the scale factors, misalignments, and drift-rate biases of the gyro using the on-orbit sensor measurements. These gyro parameters have been traditionally treated as temperature-independent in the operational flight dynamics ground systems at NASA Goddard Space Flight Center (GSFC), a scenario which has been successfully applied in the gyro calibration of a large number of missions. A significant departure from this is...
Topics: NASA Technical Reports Server (NTRS), CALIBRATING, GYROSCOPES, TEMPERATURE DEPENDENCE, COMPUTERIZED...
The mathematical modeling and programming of a complete simulation program for a space station computer-steered high gain antenna are described. The program provides for reading input data cards, numerically integrating up to 50 first order differential equations, and monitoring up to 48 variables on printed output and on plots. The program system consists of a high gain antenna, an antenna gimbal control system, an on board computer, and the environment in which all are to operate.
Topics: NASA Technical Reports Server (NTRS), ANTENNA DESIGN, COMPUTERIZED SIMULATION, MATHEMATICAL MODELS,...
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Marshall Space Flight Center teamed with the University of Alabama in Huntsville (UAH) in 1989 on a program involving development of advanced simulation software. Concurrently, the State of Alabama chartered UAH to conduct a technology advancement program in support of the state's apparel manufacturers. In 1992, under contract to Marshall, UAH developed an apparel-specific software package that allows manufacturers to design and analyze modules without making an actual investment -- it...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, GARMENTS, MANUFACTURING, SOFTWARE...
Computer simulations of the one-on-one aerial combat encounter are generated under the control of specified guidance laws. Given an initial state, the vehicle and atmospheric characteristics, and the guidance laws, the aerial combat encounter is simulated by forward integration of the two vehicles' motions. The development of a combat guidance law which converts positional advantage into an improved firing opportunity is reported. A combination of lag, line of sight, and lead pursuit steering...
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT GUIDANCE, COMBAT, FIGHTER AIRCRAFT, HEURISTIC...
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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,...
NASA Network Resource and Training Site
by NASA Technical Reports Server (NTRS)
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Published report describes analytical development and simulation of braking system. System prevents wheels from skidding when brakes are applied, significantly reducing stopping distance. Report also presents computer simulation study on system as applied to aircraft.
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT BRAKES, ANTISKID DEVICES, BRAKES (FOR ARRESTING...
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by NASA Technical Reports Server (NTRS)
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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,...
An analytical study was made of the stability of a closed-loop liquid-lithium temperature control of the primary loop of a conceptual nuclear Brayton space powerplant. The operating point was varied from 20 to 120 percent of design. A describing-function technique was used to evaluate the effects of temperature dead band and control coupling backlash. From the system investigation, it was predicted that a limit cycle will not exist with a temperature dead band, but a limit cycle will not exist...
Topics: NASA Technical Reports Server (NTRS), BRAYTON CYCLE, SPACE POWER UNIT REACTORS, TEMPERATURE...
The performance of personnel in the augmentation and improvement of the interactive IMSIM information management simulation model is summarized. With this augmented model, NASA now has even greater capabilities for the simulation of computer system configurations, data processing loads imposed on these configurations, and executive software to control system operations. Through these simulations, NASA has an extremely cost effective capability for the design and analysis of computer-based data...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, INFORMATION MANAGEMENT, MATHEMATICAL...
Simple linear rheologies were used with elastic forces driving the main events and viscoelastic forces being important for aftershock and creep occurrence. Friction and its dependence on velocity, stress, and displacement also plays a key role in determining how, when, and where fault motion occurs. The discussion of the qualitative behavior of the simulators focuses on the manner in which energy was stored in the system and released by the unstable and stable sliding processes. The numerical...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, EARTHQUAKES, GEOLOGICAL FAULTS,...
A computerized simulation of a planar phased array of circular waveguide elements is reported using mutual coupling and wide angle impedance matching in phased arrays. Special emphasis is given to circular polarization. The aforementioned computer program has as variable inputs: frequency, polarization, grid geometry, element size, dielectric waveguide fill, dielectric plugs in the waveguide for impedance matching, and dielectric sheets covering the array surface for the purpose of wide angle...
Topics: NASA Technical Reports Server (NTRS), ANTENNA ARRAYS, COMPUTERIZED SIMULATION, PHASED ARRAYS,...
The evolution of domain walls in the early universe is studied via 2-D computer simulation. The walls are initially configured on a triangular lattice and then released from the lattice, their evolution driven by wall curvature and by the universal expansion. The walls attain an average velocity of about 0.3c and their surface area per volume (as measured in comoving coordinates) goes down with a slope of -1 with respect to conformal time, regardless of whether the universe is matter or...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, COSMOLOGY, DOMAIN WALL, STRING...
A new approach for determination of machine-tool settings for spiral bevel gears is proposed. The proposed settings provide a predesigned parabolic function of transmission errors and the desired location and orientation of the bearing contact. The predesigned parabolic function of transmission errors is able to absorb piece-wise linear functions of transmission errors that are caused by the gear misalignment and reduce gear noise. The gears are face-milled by head cutters with conical surfaces...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, GEAR TEETH,...
A study was conducted to determine the effects of degrading a rotating blade element rotor mathematical model suitable for real-time simulation of rotorcraft. Three methods of degradation were studied, reduction of number of blades, reduction of number of blade segments, and increasing the integration interval, which has the corresponding effect of increasing blade azimuthal advance angle. The three degradation methods were studied through static trim comparisons, total rotor force and moment...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, MATHEMATICAL MODELS, REAL TIME...
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The next generation of rocket engine turbopumps is being developed by industry through Government-directed contracts. These turbopumps will use fluid film bearings because they eliminate the life and shaft-speed limitations of rolling-element bearings, increase turbopump design flexibility, and reduce the need for turbopump overhauls and maintenance. The design of the fluid film bearings for these turbopumps, however, requires sophisticated analysis tools to model the complex physical behavior...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, FLUID FILMS,...
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),...
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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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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,...
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...
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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...
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by NASA Technical Reports Server (NTRS)
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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,...
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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),...
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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...
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...
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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by NASA Technical Reports Server (NTRS)
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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),...
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...
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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,...
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,...
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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,...
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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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,...
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),...
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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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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,...
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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...
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The Society for Computer Simulation International is a professional technical society that distributes information on methodology techniques and uses of computer simulation. The society uses NETS, a NASA-developed program, to assist seminar participants in learning to use neural networks for computer simulation. NETS is a software system modeled after the human brain; it is designed to help scientists exploring artificial intelligence to solve pattern matching problems. Examples from NETS are...
Topics: NASA Technical Reports Server (NTRS), ARTIFICIAL INTELLIGENCE, COMPUTER SYSTEMS PROGRAMS,...
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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,...
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,...
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,...
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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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,...
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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,...
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 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,...
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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,...
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...
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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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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,...
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,...