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NASA Network Resource and Training Site
Dec 29, 2015 NASA Technical Reports Server (NTRS)
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Article contribution towards Edge.org's annual question. This one will be about a new type of artificial intelligence.
Topics: NASA Technical Reports Server (NTRS), ARTIFICIAL INTELLIGENCE, BAYES THEOREM, PROBABILITY THEORY,...
The key uncertainties in the climate sensitivity to the increasing greenhouse gases lie in the behavior and impact of short-lived species, such as tropospheric aerosols and ozone, and secondly, in the response and impact of the ocean circulation.
Topics: NASA Technical Reports Server (NTRS), CLOUDS (METEOROLOGY), AEROSOLS, TROPOSPHERE, ATMOSPHERIC...
This work demonstrates the development and implementation of a Fully Constrained Least Squares (FCLS) unmixing model developed in C++ programming language with OpenCV package and boost C++ libraries in the NASA Earth Exchange (NEX). Visualization of the results is supported by GRASS GIS and statistical analysis is carried in R in a Linux system environment. FCLS was first tested on computer simulated data with Gaussian noise of various signal-to-noise ratio, and Landsat data of an agricultural...
Topics: NASA Technical Reports Server (NTRS), LANDSAT SATELLITES, SATELLITE IMAGERY, AGRICULTURE, DATA...
NASA Network Resource and Training Site
Dec 1, 2015 NASA Technical Reports Server (NTRS)
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The purpose of this report is to address uncertainties in the plasma models at Jupiter responsible for surface charging and to update the jovian plasma models using the most recent data available. The updated plasma environment models were then used to evaluate two proposed Europa mission designs for spacecraft charging effects using the Nascap-2k code. The original Divine/Garrett jovian plasma model (or "DG1", T. N. Divine and H. B. Garrett, "Charged particle distributions in...
Topics: NASA Technical Reports Server (NTRS), SPACECRAFT CHARGING, COLD PLASMAS, JUPITER (PLANET), MISSION...
A parametric study was conducted to establish Thermal Protection System (TPS) loss from foam and ice impact conditions similar to what might occur on the Space Launch System. This study was based upon the large amount of testing and analysis that was conducted with both ice and foam debris impacts on TPS acreage foam for the Space Shuttle Project External Tank. Test verified material models and modeling techniques that resulted from Space Shuttle related testing were utilized for this...
Topics: NASA Technical Reports Server (NTRS), THERMAL PROTECTION, FOAMS, ICE, LOSSES, IMPACT TESTS, IMPACT...
Ytterbium disilicate is of interest as a potential environmental barrier coating for aerospace applications, notably for use in next generation jet turbine engines. In such applications, the transport of oxygen and water vapor through these coatings to the ceramic substrate is undesirable if high temperature oxidation is to be avoided. In an effort to understand the diffusion process in these materials, we have performed kinetic Monte Carlo simulations of vacancy-mediated and interstitial...
Topics: NASA Technical Reports Server (NTRS), MONTE CARLO METHOD, COMPUTERIZED SIMULATION, OXYGEN,...
The development of the Space Launch System (SLS) launch vehicle requires cross discipline teams with extensive knowledge of launch vehicle subsystems, information theory, and autonomous algorithms dealing with all operations from pre-launch through on orbit operations. The characteristics of these systems must be matched with the autonomous algorithm monitoring and mitigation capabilities for accurate control and response to abnormal conditions throughout all vehicle mission flight phases,...
Topics: NASA Technical Reports Server (NTRS), LAUNCH VEHICLES, END-TO-END DATA SYSTEMS, DATA PROCESSING,...
NASA Network Resource and Training Site
Oct 29, 2015 NASA Technical Reports Server (NTRS)
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No abstract available
Topics: NASA Technical Reports Server (NTRS), SPACECRAFT MODELS, COMPUTERIZED SIMULATION, ROCKET ENGINE...
NASA Network Resource and Training Site
Oct 27, 2015 NASA Technical Reports Server (NTRS)
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The Simulation-to-Flight 1 (STF-1) CubeSat mission aims to demonstrate how legacy simulation technologies may be adapted for flexible and effective use on missions using the CubeSat platform. These technologies, named NASA Operational Simulator (NOS), have demonstrated significant value on several missions such as James Webb Space Telescope, Global Precipitation Measurement, Juno, and Deep Space Climate Observatory in the areas of software development, mission operationstraining, verification...
Topics: NASA Technical Reports Server (NTRS), NANOSATELLITES, SOFTWARE ENGINEERING, COMPUTER PROGRAMMING,...
Zero-temperature density functional theory (DFT), density functional theory molecular dynamics (DFT-MD), and classical molecular dynamics using polarizable force fields (PFF-MD) are employed to evaluate the influence of Lithium ion on the structure, transport, and electrochemical stability of three potential ionic liquid electrolytes: N--methyl-N-butylpyrrolidinium bis(trifluoromethanesulfonyl)imide ([pyr14][TFSI]), N--methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide ([pyr13][FSI]), and...
Topics: NASA Technical Reports Server (NTRS), SIMULATION, ELECTRONIC STRUCTURE, LITHIUM, ADDITIVES,...
NASA Network Resource and Training Site
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No abstract available
Topics: NASA Technical Reports Server (NTRS), SPACE EXPLORATION, COMPUTER SYSTEMS PROGRAMS, FLIGHT...
Performance prediction of turbomachines is a significant part of aircraft propulsion design. In the conceptual design stage, there is an important need to quantify compressor and turbine aerodynamic performance and develop initial geometry parameters at the 2-D level prior to more extensive Computational Fluid Dynamics (CFD) analyses. The Object-oriented Turbomachinery Analysis Code (OTAC) is being developed to perform 2-D meridional flowthrough analysis of turbomachines using an implicit...
Topics: NASA Technical Reports Server (NTRS), TURBOMACHINERY, COMPUTATIONAL FLUID DYNAMICS, OBJECT-ORIENTED...
Performance prediction of turbomachines is a significant part of aircraft propulsion design. In the conceptual design stage, there is an important need to quantify compressor and turbine aerodynamic performance and develop initial geometry parameters at the 2-D level prior to more extensive Computational Fluid Dynamics (CFD) analyses. The Object-oriented Turbomachinery Analysis Code (OTAC) is being developed to perform 2-D meridional flowthrough analysis of turbomachines using an implicit...
Topics: NASA Technical Reports Server (NTRS), OBJECT-ORIENTED PROGRAMMING, TURBOMACHINERY, AERODYNAMIC...
We investigate the performance of a generalized linear mixed model in predicting the Probabilities of Collision (Pc) for conjunction events. Specifically, we apply this model to the log(sub 10) transformation of these probabilities and argue that this transformation yields values that can be considered bounded in practice. Additionally, this bounded random variable, after scaling, is zero-inflated. Consequently, we model these values using the zero-inflated Beta distribution, and utilize the...
Topics: NASA Technical Reports Server (NTRS), COLLISIONS, PROBABILITY THEORY, BAYES THEOREM, PREDICTIONS,...
NASA Network Resource and Training Site
Oct 18, 2015 NASA Technical Reports Server (NTRS)
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Valves are used in many domains and often have system-critical functions. As such, it is important to monitor the health of valves and their actuators and predict remaining useful life. In this work, we develop a model-based prognostics approach for a rotary valve actuator. Due to limited observability of the component with multiple failure modes, a lumped damage approach is proposed for estimation and prediction of damage progression. In order to support the goal of real-time prognostics, an...
Topics: NASA Technical Reports Server (NTRS), REAL TIME OPERATION, CONTROL VALVES, FUEL VALVES, ACTUATORS,...
The Advance Manufacturing Technology (AMT) Project supports multiple activities within the Administration's National Manufacturing Initiative. A key component of the Initiative is the Advanced Manufacturing National Program Office (AMNPO), which includes participation from all federal agencies involved in U.S. manufacturing. In support of the AMNPO the AMT Project supports building and Growing the National Network for Manufacturing Innovation through a public-private partnership designed to...
Topics: NASA Technical Reports Server (NTRS), ADDITIVE MANUFACTURING, INDUSTRIES, MANUFACTURING, DESIGN...
NASA Network Resource and Training Site
Oct 12, 2015 NASA Technical Reports Server (NTRS)
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NASAs Space Communications and Navigation (SCaN) program manages three active networks: the Near Earth Network, the Space Network, and the Deep Space Network. These networks simultaneously support NASA missions and provide communications services to customers worldwide. To efficiently manage these resources and their capabilities, a team of student interns at the NASA Glenn Research Center is developing a distributed system to model the SCaN networks. Once complete, the system shall provide a...
Topics: NASA Technical Reports Server (NTRS), SPACE COMMUNICATION, COMMUNICATION NETWORKS, ELECTRICAL...
NASA Network Resource and Training Site
Oct 12, 2015 NASA Technical Reports Server (NTRS)
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With the International Space Station Program transition from assembly to utilization, focus has been placed on the optimization of essential resources. This includes resources both resupplied from the ground and also resources produced by the ISS. In an effort to improve the use of two of these, the ISS Engineering teams, led by the ISS Program Systems Engineering and Integration Office, undertook an effort to modify the techniques use to perform several key on-orbit events. The primary...
Topics: NASA Technical Reports Server (NTRS), INTERNATIONAL SPACE STATION, SYSTEMS ENGINEERING,...
This work provides an efficiency analysis of the LightForce space debris collision avoidance scheme in the current debris environment and describes a simulation approach to assess its impact on the long-term evolution of the space debris environment. LightForce aims to provide just-in-time collision avoidance by utilizing photon pressure from ground-based industrial lasers. These ground stations impart minimal accelerations to increase the miss distance for a predicted conjunction between two...
Topics: NASA Technical Reports Server (NTRS), SPACE DEBRIS, COLLISION AVOIDANCE, COMPUTERIZED SIMULATION,...
NASA Network Resource and Training Site
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The utility of a radiation exposure analysis depends not only on the accuracy of the underlying particle transport code, but also on the accuracy of the geometric representations of both the vehicle used as radiation shielding mass and the phantom representation of the human form. The current NASA/Space Radiation Analysis Group (SRAG) process to determine crew radiation exposure in a vehicle design incorporates both output from an analytic High Z and Energy Particle Transport (HZETRN) code and...
Topics: NASA Technical Reports Server (NTRS), COMPUTER AIDED DESIGN, MANNED SPACECRAFT, SPACECREWS,...
This talk presents some of the detailed observations of low-level stratocumulus over northern Vietnam during 7-SEASBASELInE 2013 by SMARTLabs' ACHIEVE W-band cloud radar and other remote sensing instruments. These observations are the first of their kind for this region and will aid in ongoing studies of biomass-burning aerosol impacts on local and regional weather and climate. Preliminary results from simulations using the Goddard Cumulus Ensemble (GCE) with recently implemented triple-moment...
Topics: NASA Technical Reports Server (NTRS), VIETNAM, REMOTE SENSING, AEROSOLS, OPTICAL THICKNESS, CLOUD...
NASA Network Resource and Training Site
Oct 5, 2015 NASA Technical Reports Server (NTRS)
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Presentation is a discussion on NASA Lessons Observed related to large complex system design.
Topics: NASA Technical Reports Server (NTRS), COMPLEX SYSTEMS, SYSTEMS ENGINEERING, CONCURRENT ENGINEERING,...
NASA Network Resource and Training Site
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Unmanned aircraft will equip with a detect-and-avoid (DAA) system that enables them to comply with the requirement to "see and avoid" other aircraft, an important layer in the overall set of procedural, strategic and tactical separation methods designed to prevent mid-air collisions. This paper describes a capability called Java Architecture for Detect and Avoid Extensibility and Modeling (JADEM), developed to prototype and help evaluate various DAA technological requirements by...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, COMPUTER PROGRAMS, AIRCRAFT...
Because of the relatively high specific mechanical properties of carbon fiber/epoxy composite materials, they are often used as structural components in aerospace applications. Graphene nanoplatelets (GNPs) can be added to the epoxy matrix to improve the overall mechanical properties of the composite. The resulting GNP/carbon fiber/epoxy hybrid composites have been studied using multiscale modeling to determine the influence of GNP volume fraction, epoxy crosslink density, and GNP dispersion on...
Topics: NASA Technical Reports Server (NTRS), MECHANICAL PROPERTIES, GRAPHENE, NANOCOMPOSITES, CARBON...
NASA Network Resource and Training Site
Sep 28, 2015 NASA Technical Reports Server (NTRS)
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The use of composite materials continues to increase in the aerospace community due to the potential benefits of reduced weight, increased strength, and manufacturability. Ongoing work at NASA involves the use of the large-scale composite structures for spacecraft (payload shrouds, cryotanks, crew modules, etc). NASA is also working to enable the use and certification of composites in aircraft structures through the Advanced Composites Project (ACP). The rapid, in situ characterization of a...
Topics: NASA Technical Reports Server (NTRS), NONDESTRUCTIVE TESTS, COMPOSITE MATERIALS, THERMOGRAPHY,...
This paper provides a status update on the implementation of a flexible, long-term space debris simulation approach. The motivation is to build a tool that can assess the long-term impact of various options for debris-remediation, including the LightForce space debris collision avoidance concept that diverts objects using photon pressure [9]. State-of-the-art simulation approaches that assess the long-term development of the debris environment use either completely statistical approaches, or...
Topics: NASA Technical Reports Server (NTRS), SPACECRAFT BREAKUP, SPACE DEBRIS, COMPUTERIZED SIMULATION,...
NASA Network Resource and Training Site
Sep 9, 2015 NASA Technical Reports Server (NTRS)
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No abstract available
Topics: NASA Technical Reports Server (NTRS), SPACE SUITS, ANTHROPOMETRY, HUMAN FACTORS ENGINEERING, THREE...
The NASA Digital Astronaut Project (DAP) implements well-vetted computational models to predict and assess spaceflight health and performance risks, and to enhance countermeasure development. The DAP Musculoskeletal Modeling effort is developing computational models to inform exercise countermeasure development and to predict physical performance capabilities after a length of time in space. For example, integrated exercise device-biomechanical models can determine localized loading, which will...
Topics: NASA Technical Reports Server (NTRS), MUSCULOSKELETAL SYSTEM, MICROGRAVITY, BIODYNAMICS, PHYSICAL...
NASA's exploration goals are focused on deep space travel and Mars surface operations. To accomplish these goals, large structures will be necessary to transport crew and logistics in the initial stages, and NASA will need to keep the crew and the vehicle safe during transport and any surface activities. One of the major challenges of deep space travel is the space radiation environment and its impacts on the crew, the electronics, and the vehicle materials. The primary radiation from the sun...
Topics: NASA Technical Reports Server (NTRS), NEUTRONS, GALACTIC COSMIC RAYS, MANNED SPACECRAFT, COMPUTER...
NASA Network Resource and Training Site
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Concurrent Engineering Centers (CECs) are specialized facilities with a goal of generating and maturing engineering designs by enabling rapid design iterations. This is accomplished by co-locating a team of experts (either physically or virtually) in a room with a focused design goal and a limited timeline of a week or less. The systems engineer uses a model of the system to capture the relevant interfaces and manage the overall architecture. A single model that integrates other design...
Topics: NASA Technical Reports Server (NTRS), CONCURRENT ENGINEERING, SYSTEMS ENGINEERING, SURVEYS, SPACE...
No abstract available
Topics: NASA Technical Reports Server (NTRS), LITHIUM BATTERIES, ELECTRIC BATTERIES, ELECTROCHEMISTRY,...
NASA Network Resource and Training Site
Aug 13, 2015 NASA Technical Reports Server (NTRS)
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No abstract available
Topics: NASA Technical Reports Server (NTRS), ELECTRIC MOTORS, ROTORS, MAGNETIC MATERIALS, ACCESSORIES,...
NASA Network Resource and Training Site
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No abstract available
Topics: NASA Technical Reports Server (NTRS), ADDITIVE MANUFACTURING, METAL POWDER, MICROSTRUCTURE,...
NASA Network Resource and Training Site
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No abstract available
Topics: NASA Technical Reports Server (NTRS), METAL POWDER, ADDITIVE MANUFACTURING, MICROSTRUCTURE,...
This research uses GCM derived products, with 1 km spatial resolution and sampled every 10 minutes, over a moving area following the track of a simulated severe Atlantic storm. Model products were aggregated over sounder footprints corresponding to 13 km in LEO, 2 km in LEO, and 5 km in GEO sampled every 72 minutes. We simulated radiances for instruments with AIRS-like spectral coverage, spectral resolution, and channel noise, using these aggregated products as the truth, and analyzed them...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, SPATIAL RESOLUTION, CHANNEL NOISE,...
NASA Network Resource and Training Site
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Trajectory simulations with advanced optimization algorithms are invaluable tools in the process of designing spacecraft. Due to the need for complex models, simulations are often highly tailored to the needs of the particular program or mission. NASA's Orion and SLS programs are no exception. While independent analyses are valuable to assess individual spacecraft capabilities, a complete end-to-end trajectory from launch to splashdown maximizes potential performance and ensures a continuous...
Topics: NASA Technical Reports Server (NTRS), TRAJECTORIES, LAUNCHING, TRAJECTORY OPTIMIZATION,...
NASA Network Resource and Training Site
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NASA's NextGen Concepts and Technology Development (CTD) Project focuses on capabilities to improve safety, capacity and efficiency of the National Air Space (NAS). In order to achieve those objectives, NASA sought industry-Government partnerships to research and identify solutions for traffic flow management, dynamic airspace configuration, separation assurance, super density operations, airport surface operations and similar forward-looking air-traffic modernization (ATM) concepts. Data...
Topics: NASA Technical Reports Server (NTRS), NATIONAL AIRSPACE SYSTEM, DATA TRANSMISSION, AIRCRAFT...
NASA Network Resource and Training Site
Jul 29, 2015 NASA Technical Reports Server (NTRS)
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This talk presents 3 different tools developed recently for contamination analysis:HTML QCM analyzer: runs in a web browser, and allows for data analysis of QCM log filesJava RGA extractor: can load in multiple SRS.ana files and extract pressure vs. time dataC++ Contamination Simulation code: 3D particle tracing code for modeling transport of dust particulates and molecules. Uses residence time to determine if molecules stick. Particulates can be sampled from IEST-STD-1246 and be accelerated by...
Topics: NASA Technical Reports Server (NTRS), CONTAMINATION, COMPUTERIZED SIMULATION, PARTICULATES, DATA...
We present column CO2 measurements taken by the passive Miniaturized Laser Heterodyne Radiometer (Mini-LHR) at 1611.51 nm at the Mauna Loa Observatory (MLO) in Hawaii. The Mini-LHR was operated autonomously, during the month of May 2013 at this site, working in tandem with an AERONET sun photometer that measures aerosol optical depth at 15 minute intervals during daylight hours. Laser Heterodyne Radiometry has been used since the 1970s to measure atmospheric gases such as ozone, water vapor,...
Topics: NASA Technical Reports Server (NTRS), AUTONOMY, IN SITU MEASUREMENT, CARBON DIOXIDE, ATMOSPHERIC...
This paper presents an overview of the flight test objectives and performance of the Orion Launch Abort System during Exploration Flight Test-1. Exploration Flight Test-1, the first flight test of the Orion spacecraft, was managed and led by the Orion prime contractor, Lockheed Martin, and launched atop a United Launch Alliance Delta IV Heavy rocket. This flight test was a two-orbit, high-apogee, high-energy entry, low-inclination test mission used to validate and test systems critical to crew...
Topics: NASA Technical Reports Server (NTRS), ABORT APPARATUS, LAUNCH ESCAPE SYSTEMS, NASA SPACE PROGRAMS,...
NASA Network Resource and Training Site
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The Generalized Fluid System Simulation Program (GFSSP) is a finite-volume based general-purpose computer program for analyzing steady state and time-dependent flow rates, pressures, temperatures, and concentrations in a complex flow network. The program is capable of modeling real fluids with phase changes, compressibility, mixture thermodynamics, conjugate heat transfer between solid and fluid, fluid transients, pumps, compressors, flow control valves and external body forces such as gravity...
Topics: NASA Technical Reports Server (NTRS), FINITE VOLUME METHOD, COMPUTER PROGRAMS, FLUID FLOW,...
The purpose of this effort is to develop, demonstrate, and evaluate three asymmetric thrust detection approaches to aid in the reduction of asymmetric thrust-induced aviation accidents. This paper presents the results from that effort and their evaluation in simulation studies, including those from a real-time flight simulation testbed. Asymmetric thrust is recognized as a contributing factor in several Propulsion System Malfunction plus Inappropriate Crew Response (PSM+ICR) aviation accidents....
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT ACCIDENTS, ASYMMETRY, THRUST, MALFUNCTIONS, SYSTEMS...
Affordable and convenient access to electrical power is essential for all spacecraft and is a critical design driver for the next generation of smallsats, including CubeSats, which are currently extremely power limited. The Lightweight Integrated Solar Array (LISA), a concept designed, prototyped, and tested at the NASA Marshall Space Flight Center (MSFC) in Huntsville, Alabama provides an affordable, lightweight, scalable, and easily manufactured approach for power generation in space. This...
Topics: NASA Technical Reports Server (NTRS), LOW WEIGHT, SYSTEMS INTEGRATION, SOLAR ARRAYS, SMALL...
No abstract available
Topics: NASA Technical Reports Server (NTRS), EDUCATION, COMPUTATIONAL FLUID DYNAMICS, THERMODYNAMIC...
NASA Network Resource and Training Site
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Current reduced-order thermal model for cryogenic propellant tanks is based on correlations built for flat plates collected in the 1950's. The use of these correlations suffers from inaccurate geometry representation; inaccurate gravity orientation; ambiguous length scale; and lack of detailed validation. This study uses first-principles based CFD methodology to compute heat transfer from the tank wall to the cryogenic fluids and extracts and correlates the equivalent heat transfer coefficient...
Topics: NASA Technical Reports Server (NTRS), COMPUTATIONAL FLUID DYNAMICS, EXTRACTION, HEAT TRANSFER...
A feedback free fluidic oscillator was designed and integrated into a single element rocket combustor with
Topics: NASA Technical Reports Server (NTRS), COMBUSTION CONTROL, DUMP COMBUSTORS, FEEDBACK, FLUIDICS,...
The purpose of this effort is to develop, demonstrate, and evaluate three asymmetric thrust detection approaches to aid in the reduction of asymmetric thrust-induced aviation accidents. This paper presents the results from that effort and their evaluation in simulation studies, including those from a real-time flight simulation testbed. Asymmetric thrust is recognized as a contributing factor in several Propulsion System Malfunction plus Inappropriate Crew Response (PSM+ICR) aviation accidents....
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT ACCIDENTS, FLIGHT SIMULATION, MALFUNCTIONS,...
The background gas in a vacuum facility for electric propulsion ground testing is examined in detail through a series of cold flow simulations using a direct simulation Monte Carlo (DSMC) code. The focus here is on the background gas itself, its structure and characteristics, rather than assessing its interaction and impact on thruster operation. The background gas, which is often incorrectly characterized as uniform, is found to have a notable velocity within a test facility. The gas velocity...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, ELECTRIC PROPULSION, TEST...
This paper describes the experience of the authors in using the Generalized Fluid System Simulation Program (GFSSP) in teaching Design of Thermal Systems class at University of Alabama in Huntsville. GFSSP is a finite volume based thermo-fluid system network analysis code, developed at NASA/Marshall Space Flight Center, and is extensively used in NASA, Department of Defense, and aerospace industries for propulsion system design, analysis, and performance evaluation. The educational version of...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, THERMODYNAMICS,...
The Regolith Advanced Surface Systems Operations Robot (RASSOR) Phase 2 is an excavation robot for mining regolith on a planet like Mars. The robot is programmed using the Robotic Operating System (ROS) and it also uses a physical simulation program called Gazebo. This internship focused on various functions of the program in order to make it a more professional and efficient robot. During the internship another project called the Smart Autonomous Sand-Swimming Excavator was worked on. This is...
Topics: NASA Technical Reports Server (NTRS), REGOLITH, ROBOTICS, AUTONOMY, EXCAVATION, SANDS, MARS...
The fracture of carbon materials is a complex process, the understanding of which is critical to the development of next generation high performance materials. While quantum mechanical (QM) calculations are the most accurate way to model fracture, the fracture behavior of many carbon-based composite engineering materials, such as carbon nanotube (CNT) composites, is a multi-scale process that occurs on time and length scales beyond the practical limitations of QM methods. The Reax Force Field...
Topics: NASA Technical Reports Server (NTRS), ATOMIC STRUCTURE, FRACTURE MECHANICS, AMORPHOUS MATERIALS,...
NASA Network Resource and Training Site
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Realistic nondestructive evaluation (NDE) simulation tools enable inspection optimization and predictions of inspectability for new aerospace materials and designs. NDE simulation tools may someday aid in the design and certification of advanced aerospace components; potentially shortening the time from material development to implementation by industry and government. Furthermore, modeling and simulation are expected to play a significant future role in validating the capabilities and...
Topics: NASA Technical Reports Server (NTRS), NONDESTRUCTIVE TESTS, COMPOSITE MATERIALS, COMPUTERIZED...
NASA Network Resource and Training Site
Jul 22, 2015 NASA Technical Reports Server (NTRS)
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We describe the capabilities of the Global Modeling Initiative (GMI) chemical transport model (CTM) with a special focus on capabilities related to the Atmospheric Tomography Mission (ATom). Several science results based on GMI hindcast simulations and preliminary results from the ATom simulations are highlighted. We also discuss the relationship between GMI and GEOS-5.
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC CHEMISTRY, HINDCASTING, TROPOSPHERE,...
NASA's plan to launch several spacecraft into low Earth Orbit (LEO) to support science missions in the next ten years and beyond requires down link throughput on the order of several terabits per day. The ability to handle such a large volume of data far exceeds the capabilities of current systems. This paper proposes two solutions, first, a high data rate link between the LEO spacecraft and ground via relay satellites in geostationary orbit (GEO). Second, a high data rate direct to ground link...
Topics: NASA Technical Reports Server (NTRS), NASA PROGRAMS, SPACECRAFT LAUNCHING, LOW EARTH ORBITS, REMOTE...
NASA Network Resource and Training Site
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Satellite communication has largely been accomplished using reflector antennas. However, such antennas are inherently bulky, and rely on mechanical steering. For this reason, ultra-wideband (UWB) and beam forming arrays have received strong interest. These lower weight, size,and cost arrays can combine many satellite applicationsspread throughout the C–Ka bands (4–40 GHz).To this end, we seek to develop an UWB Tightly-Coupled Dipole Array (TCDA) with the following attributes: UWB band...
Topics: NASA Technical Reports Server (NTRS), WIDEBAND COMMUNICATION, ANTENNA ARRAYS, SATELLITE...
Because of the relatively high specific mechanical properties of carbon fiber/epoxy composite materials, they are often used as structural components in aerospace applications. Graphene nanoplatelets (GNPs) can be added to the epoxy matrix to improve the overall mechanical properties of the composite. The resulting GNP/carbon fiber/epoxy hybrid composites have been studied using multiscale modeling to determine the influence of GNP volume fraction, epoxy crosslink density, and GNP dispersion on...
Topics: NASA Technical Reports Server (NTRS), MECHANICAL PROPERTIES, GRAPHENE, NANOCOMPOSITES, CARBON...
NASA's plan to launch several spacecrafts into low Earth Orbit (LEO) to support science missions in the next ten years and beyond requires down link throughput on the order of several terabits per day. The ability to handle such a large volume of data far exceeds the capabilities of current systems. This paper proposes two solutions, first, a high data rate link between the LEO spacecraft and ground via relay satellites in geostationary orbit (GEO). Second, a high data rate direct to ground...
Topics: NASA Technical Reports Server (NTRS), SPACECRAFT COMMUNICATION, SPACECRAFT LAUNCHING, LOW EARTH...
NASA Network Resource and Training Site
Jul 19, 2015 NASA Technical Reports Server (NTRS)
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Ion channels are pore-forming assemblies of transmembrane proteins that mediate and regulate ion transport through cell walls. They are ubiquitous to all life forms. In humans and other higher organisms they play the central role in conducting nerve impulses. They are also essential to cardiac processes, muscle contraction and epithelial transport. Ion channels from lower organisms can act as toxins or antimicrobial agents, and in a number of cases are involved in infectious diseases. Because...
Topics: NASA Technical Reports Server (NTRS), FREE ENERGY, NONEQUILIBRIUM CONDITIONS, IONS, PROTEINS, CELL...
NASA Network Resource and Training Site
Jul 15, 2015 NASA Technical Reports Server (NTRS)
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Presentation will cover elements of modeling and simulation technologies, including game technologies, as applied to maturation of new and disruptive technologies.
Topics: NASA Technical Reports Server (NTRS), MISSION PLANNING, PROJECT MANAGEMENT, RESEARCH AND...
NASA Network Resource and Training Site
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No abstract available
Topics: NASA Technical Reports Server (NTRS), ENVIRONMENTAL MONITORING, COMPUTERIZED SIMULATION, CARBON...
Under NASA's ORION Multi-Purpose Crew Vehicle (MPCV) Environmental Control and Life Support System (ECLSS) Project at Johnson Space Center's (JSC), the Crew and Thermal Systems Division has developed performance models of the air system using Thermal Desktop/FloCAD. The Thermal Desktop model includes an Air Revitalization System (ARS Loop), a Suit Loop, a Cabin Loop, and Pressure Control System (PCS) for supplying make-up gas (N2 and O2) to the Cabin and Suit Loop. The ARS and PCS are designed...
Topics: NASA Technical Reports Server (NTRS), ENVIRONMENTAL CONTROL, LIFE SUPPORT SYSTEMS, PERFORMANCE...
The behavior of complex aerospace systems is governed by numerous parameters. For safety analysis it is important to understand how the system behaves with respect to these parameter values. In particular, understanding the boundaries between safe and unsafe regions is of major importance. In this paper, we describe a hierarchical Bayesian statistical modeling approach for the online detection and characterization of such boundaries. Our method for classification with active learning uses a...
Topics: NASA Technical Reports Server (NTRS), AEROSPACE SYSTEMS, BAYES THEOREM, FLIGHT SAFETY, FLIGHT...
The Atmosphere Revitalization Recovery and Environmental Monitoring (ARREM) project was initiated in September of 2011 as part of the Advanced Exploration Systems (AES) program. Under the ARREM project and the follow-on Life Support Systems (LSS) project, testing of sub-scale and full-scale systems has been combined with multiphysics computer simulations for evaluation and optimization of subsystem approaches. In particular, this paper will describes the testing and 1-D modeling of the combined...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, ENVIRONMENTAL MONITORING, CARBON...
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Topics: NASA Technical Reports Server (NTRS), ASTEROIDS, ASTEROID COLLISIONS, TRAJECTORIES, DISASTERS,...
The Solar Alpha Rotary Joint (SARJ) is a mechanism of the International Space Station (ISS) that orients the solar power generating arrays toward the sun as the ISS orbits our planet. The orientation with the sun must be maintained to fully charge the ISS batteries and maintain all the other ISS electrical systems operating properly. In 2007, just a few months after full deployment, the starboard SARJ developed anomalies that warranted a full investigation including ISS Extravehicular Activity...
Topics: NASA Technical Reports Server (NTRS), MECHANICAL DRIVES, INTERNATIONAL SPACE STATION, SOLAR ARRAYS,...
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Supra-arcade downflows (SADs) and downflowing loops (SADLs), observed as sunward-traveling voids and thin flux tubes in the current sheet region above developing flare arcades, are considered indicators of magnetic reconnection fueling long­-duration solar eruptions. These flows are located in regions of very low signal-­to-noise in the corona where high cadence magnetic field measurements are not yet achievable, making observations difficult to fully interpret with respect to reconnection....
Topics: NASA Technical Reports Server (NTRS), CORONAS, CORONAL LOOPS, MAGNETIC FIELDS, SOLAR WIND, VOIDS, X...
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Jul 6, 2015 NASA Technical Reports Server (NTRS)
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An independent partial assessment is provided of the technical viability of the Skylon aerospace plane concept, developed by Reaction Engines Limited (REL). The objectives are to verify REL's engineering estimates of airframe aerodynamics during powered flight and to assess the impact of Synergetic Air-Breathing Rocket Engine (SABRE) plumes on the aft fuselage. Pressure lift and drag coefficients derived from simulations conducted with Euler equations for unpowered flight compare very well with...
Topics: NASA Technical Reports Server (NTRS), PLUMES, AERODYNAMICS, AIR BREATHING ENGINES, ROCKET ENGINES,...
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A method for the quasi-one-dimensional simulation of magnetic nozzles is presented and simulations of a magnetic nozzle are performed. The effects of the density variation due to plasma expansion and the magnetic field forces on ion acceleration are investigated. Magnetic field forces acting on the electrons are found to be responsible for the formation of potential structures which accelerate ions. The effects of the plasma density variation alone are found to only weakly affect ion...
Topics: NASA Technical Reports Server (NTRS), MAGNETIC NOZZLES, ONE DIMENSIONAL FLOW, PARTICLE MOTION,...
Atmospheric turbulence models are necessary for the design of both inlet/engine and flight controls, as well as for studying coupling between the propulsion and the vehicle structural dynamics for supersonic vehicles. Models based on the Kolmogorov spectrum have been previously utilized to model atmospheric turbulence. In this paper, a more accurate model is developed in its representative fractional order form, typical of atmospheric disturbances. This is accomplished by first scaling the...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC TURBULENCE, TURBULENCE MODELS, AEROSPACE...
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Jul 1, 2015 NASA Technical Reports Server (NTRS)
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Topics: NASA Technical Reports Server (NTRS), AUTONOMOUS NAVIGATION, SPACE NAVIGATION, SPACECRAFT...
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During the next decades, manned space missions are expected to be aiming at the Lagrange points, near Earth asteroids, and Mars flyby and/or landing. The question is therefore: Are we ready to go? To answer this with a yes, we are currently using the International Space Station to develop an integrated human physiological countermeasure suite. The integrated countermeasure suite will most likely encounter: 1) Exercise devices for aerobic, dynamic and resistive exercise training; 2)...
Topics: NASA Technical Reports Server (NTRS), HEALTH, CARDIOVASCULAR SYSTEM, BONES, PHYSIOLOGY, PHYSICAL...
In support of the ongoing effort by the National Aeronautics and Space Administration (NASA) to bring supersonic commercial travel to the public, NASA, in partnership with other industry organizations, conducted a flight research experiment to analyze acoustic propagation at the lateral edge of the sonic boom carpet. The name of the effort was the Farfield Investigation of No-boom Thresholds (FaINT). The research from FaINT determined an appropriate metric for sonic boom waveforms in the...
Topics: NASA Technical Reports Server (NTRS), SONIC BOOMS, SUPERSONIC AIRCRAFT, ACOUSTIC PROPAGATION,...
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Topics: NASA Technical Reports Server (NTRS), HEALTH, MARS MISSIONS, CARDIOVASCULAR SYSTEM, MANNED SPACE...
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Topics: NASA Technical Reports Server (NTRS), ACOUSTIC PROPAGATION, WAVEFORMS, SONIC BOOMS, SUPERSONIC...
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Jun 24, 2015 NASA Technical Reports Server (NTRS)
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Accurate prediction of the thermodynamic state of the cryogenic propellants in launch vehicle tanks is necessary for mission planning and successful execution. Cryogenic propellant storage and transfer in space environments requires that tank pressure be controlled. The pressure rise rate is determined by the complex interaction of external heat leak, fluid temperature stratification, and interfacial heat and mass transfer. If the required storage duration of a space mission is longer than the...
Topics: NASA Technical Reports Server (NTRS), COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, PERFORMANCE...
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Jun 24, 2015 NASA Technical Reports Server (NTRS)
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Developed for predicting the behavior of cryogenic liquids inside propellant tanks under various environmental and operating conditions. Provides a multi-node analysis of pressurization, ullage venting and thermodynamic venting systems (TVS) pressure control using axial jet or spray bar TVS. Allows user to combine several different phases for predicting the liquid behavior for the entire flight mission timeline or part of it. Is a NASA in-house code, based on FORTRAN 90-95 and Intel Visual...
Topics: NASA Technical Reports Server (NTRS), COMPUTERIZED SIMULATION, CRYOGENIC TANKS, PERFORMANCE...
This presentation provides an overview of the work the Human Systems Integration (HSI) sub-project has done on detect and avoid (DAA) displays while working on the UAS Integration into the NAS project. Much of the work has been used to support the ongoing development of minimum operational performance standards (MOPS) for UAS by RTCA Special Committee 228. The design and results of three different human-in-the-loop simulations are discussed, with particular emphasis on the role of the UAS pilot...
Topics: NASA Technical Reports Server (NTRS), UNMANNED AIRCRAFT SYSTEMS, NATIONAL AIRSPACE SYSTEM, SYSTEMS...
The NASA Broadband Aeroacoustic Stator Simulation code was used to compute the acoustic field for higher-order modes in a circular duct geometry. To test the accuracy of the results computed by the code, the duct was terminated by an open end with an infinite flange or no flange. Both open end conditions have a theoretical solution that was used to compare with the computed results. Excellent comparison for reflection matrix values was achieved after suitable refinement of the grid at the open...
Topics: NASA Technical Reports Server (NTRS), COMPUTATIONAL AEROACOUSTICS, COMPUTERIZED SIMULATION, DUCT...
The engineering development of the National Aeronautics and Space Administration's (NASA) new Space Launch System (SLS) requires cross discipline teams with extensive knowledge of launch vehicle subsystems, information theory, and autonomous algorithms dealing with all operations from pre-launch through on orbit operations. The nominal and off-nominal characteristics of SLS's elements and subsystems must be understood and matched with the autonomous algorithm monitoring and mitigation...
Topics: NASA Technical Reports Server (NTRS), LAUNCH VEHICLES, SPACECRAFT LAUNCHING, FAILURE ANALYSIS,...
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NASA, FAA, ONERA, and other partner organizations have embarked on a significant, collaborative research effort to address the technical challenges associated with icing on large scale, three-dimensional swept wings. These are extremely complex phenomena important to the design, certification and safe operation of small and large transport aircraft. There is increasing demand to balance trade-offs in aircraft efficiency, cost and noise that tend to compete directly with allowable performance...
Topics: NASA Technical Reports Server (NTRS), AERODYNAMIC CHARACTERISTICS, LOW REYNOLDS NUMBER, ICE...
To improve existing ice accretion simulation codes, more data regarding ice roughness and its effects on convective heat transfer are required. To build on existing research on this topic, this study used the Vertical Icing Studies Tunnel (VIST) at NASA Glenn Research to model realistic ice roughness in the stagnation region of a NACA 0012 airfoil. Using the VIST, a test plate representing the leading 2% chord of the airfoil was subjected to flows of 7.62 m/s (25 ft/s), 12.19 m/s (40 ft/s), and...
Topics: NASA Technical Reports Server (NTRS), CONVECTIVE HEAT TRANSFER, ICE FORMATION, STAGNATION POINT,...
There is a collaborative research program by NASA, FAA, ONERA, and university partners to improve the fidelity of experimental and computational simulation methods for swept-wing ice accretion formulations and resultant aerodynamic effects on large transport aircraft. This research utilizes a 65 scale Common Research Model as the baseline configuration. In order to generate the ice shapes for the aerodynamic testing, ice-accretion testing will be conducted in the NASA Icing Research Tunnel...
Topics: NASA Technical Reports Server (NTRS), SWEPT WINGS, AIRCRAFT ICING, SHAPES, AERODYNAMICS,...
NASA, FAA, ONERA, and other partner organizations have embarked on a significant, collaborative research effort to address the technical challenges associated with icing on large scale, three-dimensional swept wings. These are extremely complex phenomena important to the design, certification and safe operation of small and large transport aircraft. There is increasing demand to balance trade-offs in aircraft efficiency, cost and noise that tend to compete directly with allowable performance...
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT ICING, ICE FORMATION, SWEPT WINGS, AERODYNAMICS,...
In this paper, we present a static aeroelastic analysis of a wind tunnel test model of a wing in high-lift configuration using a viscous flow simulation code. The model wing was tailored to deform during the tests by amounts similar to a composite airliner wing in highlift conditions. This required use of a viscous flow analysis to predict the lift coefficient of the deformed wing accurately. We thus utilized an existing static aeroelastic analysis framework that involves an inviscid flow code...
Topics: NASA Technical Reports Server (NTRS), AEROELASTICITY, VISCOUS FLOW, COMPUTERIZED SIMULATION,...
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Jun 22, 2015 NASA Technical Reports Server (NTRS)
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Topics: NASA Technical Reports Server (NTRS), AUTOMATIC CONTROL, ROCKET LAUNCHING, AUTONOMY, ARCHITECTURE...
Overview presentation of the Integrated Test and Evaluation sub-project of the Unmanned Aircraft System (UAS) in the National Airspace System (NAS). The emphasis of the presentation is the Live, Virtual, and Constructive (LVC) system (a broadly used name for classifying modeling and simulation) infrastructure and use of external assets and connection.
Topics: NASA Technical Reports Server (NTRS), PILOTLESS AIRCRAFT, UNMANNED AIRCRAFT SYSTEMS, IN-FLIGHT...
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Topics: NASA Technical Reports Server (NTRS), LAUNCHING BASES, SPACECRAFT LAUNCHING, TEST FACILITIES,...
Historically, the analysis and design of liquid rocket engines (LREs) has relied on full-scale testing and one-dimensional empirical tools. The testing is extremely expensive and the one-dimensional tools are not designed to capture the highly complex, and multi-dimensional features that are inherent to LREs. Recent advances in computational fluid dynamics (CFD) tools have made it possible to predict liquid rocket engine performance, stability, to assess the effect of complex flow features, and...
Topics: NASA Technical Reports Server (NTRS), ROCKET ENGINES, GASEOUS ROCKET PROPELLANTS, THREE DIMENSIONAL...
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Generalized formulations for dynamic capacity and life of ball bearings, based on the models introduced by Lundberg and Palmgren and Zaretsky, have been developed and implemented in the bearing dynamics computer code, ADORE. Unlike the original Lundberg-Palmgren dynamic capacity equation, where the elastic properties are part of the life constant, the generalized formulations permit variation of elastic properties of the interacting materials. The newly updated Lundberg-Palmgren model allows...
Topics: NASA Technical Reports Server (NTRS), BALL BEARINGS, LIFE (DURABILITY), LOADS (FORCES),...
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May 26, 2015 NASA Technical Reports Server (NTRS)
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In preparation for the upcoming experimental test flight for the Orion crew module, considerable interest was raised over the possibility of exposure to elevated levels of plasma activity and vehicle charging both externally on surfaces and internally on dielectrics during the flight test orbital operations. Initial analysis using NASCAP-2K indicated very high levels of exposure, and this generated additional interest in refining/defining the plasma and spacecraft models used in the analysis....
Topics: NASA Technical Reports Server (NTRS), SPACECRAFT CHARGING, PLASMAS (PHYSICS), CREW EXPLORATION...
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Topics: NASA Technical Reports Server (NTRS), AIR TRAFFIC CONTROL, ENGINEERING MANAGEMENT, COMPUTERIZED...
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NASA is working to develop an integrated set of advanced technologies to enable efficient arrival operations in high-density terminal airspace for the Next Generation Air Transportation System. This integrated arrival solution is being validated and verified in laboratories and transitioned to a field prototype for an operational demonstration at a major U.S. airport. Within NASA, this is a collaborative effort between Ames and Langley Research Centers involving a multi-year iterative...
Topics: NASA Technical Reports Server (NTRS), STATISTICAL ANALYSIS, ENGINEERING MANAGEMENT, AIR TRAFFIC...
The experimental methods to determine near-threshold fatigue crack growth rate data are prescribed in ASTM standard E647. To produce near-threshold data at a constant stress ratio (R), the applied stress-intensity factor (K) is decreased as the crack grows based on a specified K-gradient. Consequently, as the fatigue crack growth rate threshold is approached and the crack tip opening displacement decreases, remote crack wake contact may occur due to the plastically deformed crack wake surfaces...
Topics: NASA Technical Reports Server (NTRS), FINITE ELEMENT METHOD, MATHEMATICAL MODELS, CRACK...
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May 19, 2015 NASA Technical Reports Server (NTRS)
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Space radiation comprises protons, helium and high charged and energy (HZE) particles. High-energy particles are a concern for human space flight, because they are no known options for shielding astronauts from them. When these ions interact with matter, they damage molecules and create radiolytic species. The pattern of energy deposition and positions of the radiolytic species, called radiation track structure, is highly dependent on the charge and energy of the ion. The radiolytic species...
Topics: NASA Technical Reports Server (NTRS), EXTRATERRESTRIAL RADIATION, IONIZING RADIATION, HEAVY IONS,...
NASA's Air Traffic Management Technology Demonstration-1 (ATD-1) will operationally demonstrate the feasibility of efficient arrival operations combining ground-based and airborne NASA technologies. The ATD-1 integrated system consists of the Traffic Management Advisor with Terminal Metering which generates precise time-based schedules to the runway and merge points; Controller Managed Spacing decision support tools which provide controllers with speed advisories and other information needed to...
Topics: NASA Technical Reports Server (NTRS), AIR TRAFFIC CONTROL, TERMINAL FACILITIES, SCHEDULING,...
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May 1, 2015 NASA Technical Reports Server (NTRS)
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This manual describes the installation and execution of FUN3D version 12.7, including optional dependent packages. FUN3D is a suite of computational fluid dynamics simulation and design tools that uses mixed-element unstructured grids in a large number of formats, including structured multiblock and overset grid systems. A discretely-exact adjoint solver enables efficient gradient-based design and grid adaptation to reduce estimated discretization error. FUN3D is available with and without a...
Topics: NASA Technical Reports Server (NTRS), COMPUTATIONAL FLUID DYNAMICS, UNSTRUCTURED GRIDS...
The National Aeronautics and Space Administration (NASA) has developed independent airframe and engine models that have been integrated into a single real-time aircraft simulation for piloted evaluation of propulsion control algorithms. In order to have confidence in the results of these evaluations, the integrated simulation must be validated to demonstrate that its behavior is realistic and that it meets the appropriate Federal Aviation Administration (FAA) certification requirements for...
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT ENGINES, AIRFRAMES, TURBOFAN ENGINES, COMPUTERIZED...
Presentation provides an overview of the process to generate aerothermal databases for the Orion MPCV usingcomputational fluid dynamics (CFD) tools.
Topics: NASA Technical Reports Server (NTRS), COMPUTATIONAL FLUID DYNAMICS, CREW EXPLORATION VEHICLE,...
Rolling element bearings utilized in precision rotating machines require proper alignment, preload, and interference fits to ensure overall optimum performance. Hence, careful attention must be given to bearing installation and disassembly procedures to ensure the above conditions are met. Usually, machines are designed in such a way that bearings can be pressed into housings or onto shafts through the races without loading the rolling elements. However, in some instances, either due to limited...
Topics: NASA Technical Reports Server (NTRS), BALL BEARINGS, BEARING ALLOYS, NITINOL ALLOYS, DESIGN...
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Apr 29, 2015 NASA Technical Reports Server (NTRS)
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Overview of the AFRC Core Simulation Framework and Software Engineering processes. This is a common technology used for advance programming of multi-threaded applications such as the core simulation.
Topics: NASA Technical Reports Server (NTRS), SOFTWARE ENGINEERING, SIMULATION, COMPUTER PROGRAMMING,...