Human space exploration to date has been limited to low Earth orbit and the moon. The International Space Station (ISS) provides a unique opportunity for NASA to partner with private industry for development and demonstration of the technologies needed to support exploration initiatives. One challenge that is critical to sustainable and safer exploration is the ability to manufacture and recycle materials in space. This paper provides an overview of NASA's in-space manufacturing (ISM) project,...
Topics: NASA Technical Reports Server (NTRS), 083d66577ac1494688860a25b6c6ddae,...
Aboard the International Space Station, CO2 is removed from the cabin atmosphere by a four-bed molecular sieve (4BMS) process called the Carbon Dioxide Removal Assembly (CDRA).1 This 4BMS process operates by passing the CO2-laden air through a desiccant bed to remove any humidity and then passing the dried air through a sorbent bed to remove the CO2. While one pair of beds is in use, the other pair is thermally regenerated to allow for continuous CO2 removal.
Topics: NASA Technical Reports Server (NTRS), 377680162b054bfd89959aecb2221c3c,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 88e13c3a41ad4c3e8f2f260ac84346d8, Cmarik, Gregory E.,...
The Space Launch System (SLS) ascent aeroacoustic environments provide the externally driven noise levels predicted for vehicle ascent during transonic and supersonic flight, and serve as an important input for component and secondary structure vibroacoustic design criteria. This aerodynamically induced noise is predominantly generated by unsteady flow within the local boundary layer due to free stream interaction with the outer mold line (OML). Additional sources are shear flow interactions,...
Topics: NASA Technical Reports Server (NTRS), 7cba63eb95cd4d28a2d6b31e45a2a3e6, Herron, Andrew, Huntsville,...
Today's launch vehicles complex electronic and avionics systems heavily utilize Field Programmable Gate Array (FPGA) integrated circuits (IC) for their superb speed and reconfiguration capabilities. Consequently, FPGAs are prevalent ICs in communication protocols such as MILSTD- 1553B and in control signal commands such as in solenoid valve actuations. This paper will identify reliability concerns and high level guidelines to estimate FPGA total failure rates in a launch vehicle application....
Topics: NASA Technical Reports Server (NTRS), 07b22ee6ac0047818206e095f501339a,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 5842ee5c45804deeade6d1049da209a4,...
The Space Launch System (SLS) vehicle is part of NASA's deep space exploration plans that includes manned missions to Mars. Manufacturing uncertainties in design parameters are key considerations throughout SLS development as they have significant effects on focus parameters such as lift-off-thrust-to-weight, vehicle payload, maximum dynamic pressure, and compression loads. This presentation discusses how the SLS program captures these uncertainties by utilizing a 3 degree of freedom (DOF)...
Topics: NASA Technical Reports Server (NTRS), f4bfbc475470472aa584c5650adc2e48, Huntsville, AL, United...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 0592df7542b9496d87ade7e2c42bee49, Al Hassan, Mohammad,...
Quantitative results for aerospace engineering problems are influenced by many sources of uncertainty. Uncertainty analysis aims to make a technical contribution to decision-making through the quantification of uncertainties in the relevant variables as well as through the propagation of these uncertainties up to the result. Uncertainty can be thought of as a measure of the 'goodness' of a result and is typically represented as statistical dispersion. This paper will explain common measures of...
Topics: NASA Technical Reports Server (NTRS), 49fad1338e6a4e6985f40a9441c30050,...
Using virtual environments to assess complex large scale human tasks provides timely and cost effective results to evaluate designs and to reduce operational risks during assembly and integration of the Space Launch System (SLS). NASA's Marshall Space Flight Center (MSFC) uses a suite of tools to conduct integrated virtual analysis during the design phase of the SLS Program. Siemens Jack is a simulation tool that allows engineers to analyze human interaction with CAD designs by placing a...
Topics: NASA Technical Reports Server (NTRS), Jacobs Engineering and Science Services and Skills...
NASA is developing the Near Earth Asteroid (NEA) Scout mission that will use a solar sail to travel to an asteroid where it will perform a slow flyby to acquire science imagery. A guidance and control system was developed to meet the science and trajectory requirements. The NEA Scout design process can be applied to an interstellar or precursor mission that uses a beam-propelled sail. The scientific objectives are met by accurately targeting the destination trajectory position and velocity. The...
Topics: NASA Technical Reports Server (NTRS), 43250436fb63499b996326908fc4ccc6, Diedrich, Benjamin, Heaton,...
Reliability is the critical challenge of wireless sensing in space systems operating in extreme environments. Energy efficiency is another concern for battery powered wireless sensors. Considering the physics of wireless communications, we propose an approach called Software-Defined Wireless Communications (SDC) that dynamically decide a reliable channel(s) avoiding unnecessary redundancy of channels, out of multiple distinct electromagnetic frequency bands such as radio and infrared...
Topics: NASA Technical Reports Server (NTRS), 20ed536fb0b04c9e9787f37f24ad7399, Boyd, Darren,...
Biofilm growth has been an ongoing issue for US and Russian water systems on the International Space Station, and is a critical issue for exploration missions in which water systems must be designed to accommodate dormant periods of up to one year. On ISS, Russian condensate plumbing has previously clogged with biomass, requiring condensate plumbing to now be regularly replaced. In the US Segment, the release of biofilm from the Water Processor waste tank has clogged a solenoid valve downstream...
Topics: NASA Technical Reports Server (NTRS), 7fe5f13a5fa048f796e2900f02c6ffe4, Brown, Chris, Carter,...
The ISS WRS produces potable water from crew urine, crew latent, and Sabatier product water. This system has been operational on ISS since November 2008, producing over 30,000 L of water during that time. The WRS includes a Urine Processor Assembly (UPA) to produce a distillate from the crew urine. This distillate is combined with the crew latent and Sabatier product water and further processed by the Water Processor Assembly (WPA) to the potable water. The UPA and WPA use technologies commonly...
Topics: NASA Technical Reports Server (NTRS), Carter, Donald Layne, NASA Marshall Space Flight Center
On the composite cryotank technology development (CCTD) project, the Boeing Company built two cryotanks as a means of advancing technology and manufacturing readiness levels (TRL and MRL) and lowering the risk of fabricating full-scale fuel containment vessels.1 CCTD focused on upper stage extended duration applications where long term storage of propellants is required. The project involved the design, analysis, fabrication, and test of manufacturing demonstration units (MDU), a 2.4 m...
Topics: NASA Technical Reports Server (NTRS), 0bd22f19bba0422a9ea6c890c92fca3d,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 03712d6c028a4f019358d038f14cf9f4, Anzalone, Evan, Huntsville,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), Creech, Steve, NASA Marshall Space Flight Center
The first-ever live downlink of Ultra-High Definition (UHD) video from the International Space Station (ISS) was the highlight of a “Super Session” at the National Association of Broadcasters (NAB) Show in April 2017. Ultra-High Definition is four times the resolution of “full HD” or “1080P” video. Also referred to as “4K”, the Ultra-High Definition video downlink from the ISS all the way to the Las Vegas Convention Center required considerable planning, pushed the limits of...
Topics: NASA Technical Reports Server (NTRS), 3e9347e6d13b47fca1048d38aafc1ea4, George, Sandy, Grubbs,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), Colorado Univ., McGouldrick, Kevin
No abstract available
Topics: NASA Technical Reports Server (NTRS), b3c52639b6cb4c32a50b19d7794cacee,...
The development, modeling, and testing of components and subsystems required to feed iodine propellant to a 200-W Hall thruster and cathode are described. This work aims to address design deficiencies and issues associated with the propellant feed system that were revealed by an integrated thruster-cathode-feed system test. The feed system design is modified to use materials that are more resistant to the highly-reactive nature of iodine propellant. Dynamic modeling indicates that the inclusion...
Topics: NASA Technical Reports Server (NTRS), 159b57819d1f4aee8122316f4554f8d3,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), aaef29c3cb2244caac71d083122cab64, Arkansas-Oklahoma Center...
No abstract available
Topics: NASA Technical Reports Server (NTRS), c3d46d489df14b82ae80744dc05aace9, Harrington, Elise, Houston,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), NASA Marshall Space Flight Center, Suggs, Rob
The radiation environment of Jupiter represents a significant hazard for Europa Lander deorbit stage components, and presents a significant potential mission risk. The radiolytic degradation of ammonium perchlorate (AP) oxidizer in solid propellants may affect its properties and performance. The Monte Carlo code MONSOL was used for modeling of laboratory experiments on the electron irradiation of propellant samples. An approach for flattening dose profiles along the depth of irradiated samples...
Topics: NASA Technical Reports Server (NTRS), 1a5b75c69a6b4ea08624ca75b8a3dad7,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 369ee4b3e8194c8a85861ffd48402a24,...
This paper reports on an exploratory design and development project. Specifically this paper discusses the design and development of Interactive Concept of Operations Narrative Simulators (ICONS) as a means of enhancing the functionality of traditional Concept of Operations documents by leveraging the affordances provided by applications commonly used within the Interactive Fiction literary genre. Recommendations for an ICONS design and development methodology, along a detailed description of a...
Topics: NASA Technical Reports Server (NTRS), Alabama Univ., Denham, Andre R.
NASA is developing the Near Earth Asteroid (NEA) Scout mission that will use a solar sail to travel to an asteroid where it will perform a slow flyby to acquire science imagery. A guidance and control system was developed to meet the science and trajectory requirements. The NEA Scout design process can be applied to an interstellar or precursor mission that uses a beam propelled sail. The scientific objectives are met by accurately targeting the destination trajectory position and velocity. The...
Topics: NASA Technical Reports Server (NTRS), d74b8494b89a4e3c95e6ada03677dda8, Diedrich, Benjamin, Heaton,...
As NASA's new Space Launch System (SLS) launch vehicle continues to mature toward its first flight and beyond, so too do the agency's plans for utilization of the rocket. Substantial progress has been made toward the production of the vehicle for the first flight of SLS - an initial \"Block 1\" configuration capable of delivering more than 70 metric tons (t) to Low Earth Orbit (LEO). That vehicle will be used for an uncrewed integrated test flight, propelling NASA's Orion spacecraft...
Topics: NASA Technical Reports Server (NTRS), 38b0512c606247548458f9c378ed5421,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), ee53ca2d68ab4736aee38c08f2320bd4, Huntsville, AL, United...
No abstract available
Topics: NASA Technical Reports Server (NTRS), Limaye, S. S., Wisconsin Univ.
No abstract available
Topics: NASA Technical Reports Server (NTRS), NASA Marshall Space Flight Center, Watson, Michael D.
No abstract available
Topics: NASA Technical Reports Server (NTRS), Moorhead, Althea, NASA Marshall Space Flight Center
No abstract available
Topics: NASA Technical Reports Server (NTRS), Cooke, William, NASA Marshall Space Flight Center
No abstract available
Topics: NASA Technical Reports Server (NTRS), Boyd, Darren, NASA Marshall Space Flight Center
To properly dispose of the upper stage of the Space Launch System, the vehicle must perform a burn in Earth orbit to perform a close flyby of the Lunar surface to gain adequate energy to enter into heliocentric space. This architecture was selected to meet NASA requirements to limit orbital debris in the Earth-Moon system. The choice of a flyby for heliocentric disposal was driven by mission and vehicle constraints. This paper describes the SLS mission for Exploration Mission -1, a high level...
Topics: NASA Technical Reports Server (NTRS), Anzalone, Evan J., Dynamic Concepts, Inc.,...
The Smartphone Video Guidance Sensor (SVGS) is a miniature, self-contained autonomous rendezvous and docking sensor developed using a commercial off the shelf Android-based smartphone. It aims to provide a miniaturized solution for rendezvous and docking, enabling small satellites to conduct proximity operations and formation flying while minimizing interference with a primary payload. Previously, the sensor was limited by a slow (2 Hz) refresh rate and its use of retro-reflectors, both of...
Topics: NASA Technical Reports Server (NTRS), Carter, C., Georgia Tech
No abstract available
Topics: NASA Technical Reports Server (NTRS), Carter, Christopher, Georgia Tech
No abstract available
Topics: NASA Technical Reports Server (NTRS), Barnes, Marvin W., NASA Marshall Space Flight Center
No abstract available
Topics: NASA Technical Reports Server (NTRS), d4d2ff0c7e4e4cfa9aec1ccc786c1c6a, Huntsville, AL, United...
A number of meteor showers - the Ursids, Perseids, Leonids, eta Aquariids, Orionids, Draconids, and Andromedids - are predicted to exhibit increased rates in 2018. However, no major storms are predicted, and none of these enhanced showers outranks the typical activity of the Arietids, Southern delta Aquariids, and Geminids at small particle sizes. The MSFC stream model1 predicts higher than usual activity for the Ursid meteor shower in December 2018. While we expect an increase in activity,...
Topics: NASA Technical Reports Server (NTRS), 26174b76480c4312bfbfd4031d972100,...
The Materials Science Research Rack (MSRR) is a research facility developed under a cooperative research agreement between NASA and the European Space Agency (ESA) for materials science investigations on the International Space Station (ISS). The MSRR is managed at the Marshall Space Flight Center (MSFC) in Huntsville, AL. The MSRR facility subsystems were manufactured by Teledyne Brown Engineering (TBE) and integrated with the ESA/EADS-Astrium developed Materials Science Laboratory (MSL) at...
Topics: NASA Technical Reports Server (NTRS), NASA Marshall Space Flight Center, Reagan, Shawn
No abstract available
Topics: NASA Technical Reports Server (NTRS), f662eff9e21547ac8e7ef4449ebf1f2c, Huntsville, AL, United...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 61c4649198f14862a6c57f9ef5d7cc5e, George, Sandy, Grubbs,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), Bastion Technologies, Inc., Davis, N. Jan
The separation of gases through adsorption plays an important role in the chemical processing industry, where the separation step is often the costliest part of a chemical process and thus worthy of careful study and optimization. This work developed a number of new, archival aspects on the computer simulations used for the refinement and design of these gas adsorption processes: 1. Presented a new approach to fit the undetermined heat and mass transfer coefficients in the axially dispersed...
Topics: NASA Technical Reports Server (NTRS), Knox, James Clinton, NASA Marshall Space Flight Center
No abstract available
Topics: NASA Technical Reports Server (NTRS), Carter, Layne, NASA Marshall Space Flight Center
No abstract available
Topics: NASA Technical Reports Server (NTRS), Molthan, Andrew, NASA Marshall Space Flight Center
No abstract available
Topics: NASA Technical Reports Server (NTRS), 047456a0d0644323a717e8c1ef7bd434,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 0232627b34854a3e9e3185f63df7da26,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 0f3bdfb95e734ad0bf1e6014672f4cb5,...
The distribution of lightning with respect to tropical convective precipitation systems has been well established in previous studies and more recently by the successful Tropical Rainfall Measuring Mission (TRMM). However, TRMM did not provide information about precipitation features poleward of +/-38 deg latitude. Hence we focus on the evolution of lightning within extra-tropical cyclones traversing the mid-latitudes, especially its oceans. To facilitate such studies, lightning data from the...
Topics: NASA Technical Reports Server (NTRS), 5761b87429f8400f8c0871dcac3a499e,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 3e14ed7424cd490a980d496312755204,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 9265a1da9df04ffab04b9aae73e71166,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 1271056c9ec746df95a9cf1ad0fb5fb9,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 247e08747e6d461c91f854662b80da44,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 6bb557a49b8e4049bd969d4708b9a82c,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 3c760768883e417e87130563e1f2c1ef,...
Dam construction in the Mekong Basin has many cascading effects on the ecology, economy, and hydrology of the surrounding region. The focus of this study is to utilize the Soil Water Assessment Tool (SWAT), developed at Texas A & M, a rainfall-runoff hydrologic model to determine change in sedimentation in the Mekong Basin after the construction of dams. This study uses land cover land use and reservoir datasets created by the NASA SERVIR-Mekong Regional Land Cover Monitoring System and Dam...
Topics: NASA Technical Reports Server (NTRS), 48fc865800604a4081bda33debb19d4d,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 4ddcb67d60cf4a228e36495b47574863, Frankel-Reed, Jenny,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 053774b1e1dc48afa9ae00c4158c661f,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 3cec3bf74e99461e84c72e2a8191bae3,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 0690d0ea7eb6424dbbf3403b04240ac9,...
Recent studies indicate that solar coronal jets result from eruption of small-scale filaments, or \"minifilaments\" (Sterling et al. 2015, Nature, 523, 437; Panesar et al. ApJL, 832L, 7). In many aspects, these coronal jets appear to be small-scale versions of long-recognized large-scale solar eruptions that are often accompanied by eruption of a large-scale filament and that produce solar flares and coronal mass ejections (CMEs). In coronal jets, a jet-base bright point (JBP) that is...
Topics: NASA Technical Reports Server (NTRS), Alabama Univ., d81d67454e084901b825ae99c2575291, Huntsville,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), 73a62107acc2431c8961241d281108e3, Huntsville, AL, United...
This project evaluated the feasibility of low pressure cold plasma (CP) for two applications: disinfection of produce grown in space and sterilization of medical equipment in space. Currently there is no ISS capability for disinfecting pick and eat crops, food utensils, food production areas, or medical devices. This deficit is extended to projected long duration missions. Small, portable, cold plasma devices would provide an enhanced benefit to crew health and address issues concerning...
Topics: NASA Technical Reports Server (NTRS), 2796113c503d419ea20cf5ed0a69ce32,...
This internship was initially meant to cover the implementation of unit test automation for a NASA ground control project. As is often the case with large development projects, the scope and breadth of the internship changed. Instead, the internship focused on finding and correcting memory leaks and errors as reported by a COTS software product meant to track such issues. Memory leaks come in many different flavors and some of them are more benign than others. On the extreme end a program might...
Topics: NASA Technical Reports Server (NTRS), Joseph, Austin Pope, Portland State Univ.
The purpose of this work is to develop a version of Paschen's Law that takes into account the flow of ambient gas past electrode surfaces. Paschen's Law does not consider the flow of gas past an aerospace vehicle, whose surfaces may be triboelectrically charged by dust or ice crystal impingement while traversing the atmosphere. The basic hypothesis of this work is that the number of electron-ion pairs created per unit distance between electrode surfaces is mitigated by the electron-ion pairs...
Topics: NASA Technical Reports Server (NTRS), 748020441b304ed29db9a068ba8fab6c,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), Hollier, Andi, Jacobs Sverdrup Technology, Inc.
The announcement of the Vision for Space Exploration in 2004 sparked a resurgence in lunar missions worldwide. Since the publication of the first \"New Views of the Moon\" volume, as of 2017 there have been 11 science-focused missions to the Moon. Each of these missions explored different aspects of the Moon's geology, environment, and resource potential. The results from this flotilla of missions have revolutionized lunar science, and resulted in a profoundly new emerging...
Topics: NASA Technical Reports Server (NTRS), 1c8944aa26de40788bca6c6ef5ac9e20,...
Current data processing practice limits the volume and variety of relevant geoscience data that can practically be applied to important problems. File archives in centralized data centers are the principal means by which Earth Science data are accessed. This approach, however, requires laborious search, retrieval, and eventual customization/adaptation for the data to be used. Such fractionation makes it even more difficult to share outcomes, i.e. research artifacts and data products, hampering...
Topics: NASA Technical Reports Server (NTRS), cae8236d7a504174886a5ba948f5d22f, College Park, MD, United...
NASA's Earth Observing System (EOS) generates a wealth of data products which are generally intended for scientific research. In recent years, however, this data has also become more accessible to the applications community and public through the Worldview app and Global Imagery Browse Services (GIBS). These mapping interfaces provide historical and near real time access to NASA's Earth observations for a wide range of uses. This presentation will focus on how the applications community,...
Topics: NASA Technical Reports Server (NTRS), 0a8da473926e4b6ea71fbc2c64c38897,...
NASA Worldview is an interactive interface for browsing full-resolution, global satellite imagery. Worldview supports an open data policy so that academia, private industries and the general public can use NASA's satellite data to address Earth science related issues. Worldview was open sourced in 2014. By shifting to an open source approach, the Worldview application has evolved to better serve end-users. Project developers are able to have discussions with end-users and community developers...
Topics: NASA Technical Reports Server (NTRS), Arctic Slope Technical Services, Inc., Rice, Zachary
NASA's Earth Science Data and Information System (ESDIS) Project has implemented a fully automated system for assigning Digital Object Identifiers (DOIs) to Earth Science data products being managed by its network of 12 distributed active archive centers (DAACs). A key factor in the successful evolution of the DOI registration system over last 7 years has been the incorporation of community input from three focus groups under the NASA's Earth Science Data System Working Group (ESDSWG). These...
Topics: NASA Technical Reports Server (NTRS), ADNET Systems, Inc., bb88c51220094758be4b8814bf7b304e, James,...
Radiation Hardness Assurance (RHA) methodologies need to evolve to capitalize on the increased flexibility introduced by new models of space radiation environments. This presentation examines the characteristics of various radiation threats, the sources of error that RHA methodologies seek to control and the contributions of environment models to those errors. The influence of trends in microelectronic device technology is also considered.
Topics: NASA Technical Reports Server (NTRS), Ladbury, Ray, NASA Goddard Space Flight Center
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