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Discrepancies between the model and balance coordinate systems lead to biases in the aerodynamic measurements during wind-tunnel testing. The reference coordinate system relative to the calibration coordinate system at which the forces and moments are resolved is crucial to the overall accuracy of force measurements. This paper discusses sources of discrepancies and estimates of coordinate system rotation and translation due to machining and assembly differences. A methodology for numerically...
Topics: NASA Technical Reports Server (NTRS), e49778373c1146b4b418ec8116941eb5, Hampton, VA, United States,...
The NASA Aeronautics Research Mission Directorate (ARMD) Strategic Implementation Plan details an ambitious plan for aeronautical research for the next quarter century and beyond. It includes a number of advanced technologies needed to address requirements of the overall aviation community (domestic and international), with an emphasis on safety, efficiency, operational flexibility, and alternative propulsion air transport options. The six ARMD Strategic Thrust Areas (STAs) represent a specific...
Topics: NASA Technical Reports Server (NTRS), 28da86b845904ff48ad20d42ab23bc80,...
High-spatial-resolution OH planar laser-induced fluorescence was measured for a premixed ethylene-air turbulent flame in an electrically-heated Mach 2 continuous-flow facility (University of Virginia Supersonic Combustion Facility, Configuration E.) The facility comprised a Mach 2 nozzle, an isolator with flush-wall fuel injectors, a combustor with optical access, and an extender. The flame was anchored at a cavity flameholder with a backward-facing step of height 9 mm. The...
Topics: NASA Technical Reports Server (NTRS), 0be17c6ef1df47959a051e3ebe1abf1b,...
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Determining current carrying capacity (ampacity) of wire bundles in aerospace vehicles is critical not only to safety but also to efficient design. Published standards provide guidance on determining wire bundle ampacity but offer little flexibility for configurations where wire bundles of mixed gauges and currents are employed with varying external insulation jacket surface properties. Thermal modeling has been employed in an attempt to develop techniques to assist in ampacity determination...
Topics: NASA Technical Reports Server (NTRS), 620ff0af624e4bc1b6ec3b8fc8485d8a,...
As Unmanned Aircraft Systems (UAS) make their way to mainstream aviation operations within the National Airspace System (NAS), research efforts are underway to develop a safe and effective environment for their integration into the NAS. Detect and Avoid (DAA) systems are required to account for the lack of \"eyes in the sky\" due to having no human on-board the aircraft. The technique, results, and lessons learned from a detailed End-to-End Verification and Validation (E2-V2)...
Topics: NASA Technical Reports Server (NTRS), 3d7fb4c4ff2d41629460778824097ecb,...
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The adjoint-based design capability in FUN3D is extended to allow efficient gradient- based optimization and design of concepts with highly integrated aero-propulsive systems. A circumferential distortion calculation, along with the derivatives needed to perform adjoint-based design, have been implemented in FUN3D. This newly implemented distortion calculation can be used not only for design but also to drive the existing mesh adaptation process and reduce the error associated with the fan...
Topics: NASA Technical Reports Server (NTRS), 1861dc24fdb347e68854ddd078d3bfa5,...
A substantial effort has been made to implement an enhanced aerodynamic modeling capability in the Higher-fidelity Conceptual Design and structural optimization tool. This additional capability is needed for a rapid, physics-based method of modeling advanced aircraft concepts at risk of structural failure due to dynamic aeroelastic instabilities. To adequately predict these instabilities, in particular for transonic applications, a generalized aerodynamic matching algorithm was implemented to...
Topics: NASA Technical Reports Server (NTRS), 793afc2f76d34ba1a717240edd93f172, Gern, Frank H., Hampton,...
The NASA Unmanned Aircraft System (UAS) Traffic Management (UTM) project is conducting research to enable civilian low-altitude airspace and UAS operations. A goal of this project is to develop probabilistic methods to quantify risk during failures and off nominal flight conditions. An important part of this effort is the reliable prediction of feasible trajectories during off-nominal events such as control failure, atmospheric upsets, or navigation anomalies that can cause large deviations...
Topics: NASA Technical Reports Server (NTRS), Drexel Univ., e6fab64a17c94287910cfded39c11521, Foster, John...
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As the airspace becomes increasingly shared by autonomous small Unmanned Aerial Systems (UAS), there would be a pressing need for coordination strategies so that aircraft can safely and independently maneuver around obstacles, geofences, and traffic aircraft. Explicitly coordinating resolution strategies for small UAS would require additional components such as a reliable vehicle-to-vehicle communication infrastructure and standardized protocols for information exchange that could significantly...
Topics: NASA Technical Reports Server (NTRS), 6b45bed48bb544ada5ce9bfc09cbe8ae, Balachandran, Swee,...
A third wind tunnel test of the FAST-MAC circulation control semi-span model was completed in the National Transonic Facility at the NASA Langley Research Center where the model was configured for transonic testing of the cruise configuration with 0deg flap detection to determine the potential for transonic drag reduction with the circulation control blowing. The model allowed independent control of four circulation control plenums producing a high momentum jet from a blowing slot near the wing...
Topics: NASA Technical Reports Server (NTRS), 3ff7271f693849d58b8f8e1474e3656c,...
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Over the past several years, the use of electric propulsion technologies within aircraft design has received increased attention. The characteristics of electric propulsion systems open up new areas of the aircraft design space, such as the use of distributed electric propulsion (DEP). In this approach, electric motors are placed in many different locations to achieve increased efficiency through integration of the propulsion system with the airframe. Under a project called Scalable Convergent...
Topics: NASA Technical Reports Server (NTRS), 077613f0d76445808d7bd3499fec5049,...
This paper studies the whirl flutter stability of the NASA experimental electric propulsion aircraft designated the X-57 Maxwell. whirl flutter stability is studied at two flight conditions: sea level at 2700 RPM to represent take-off and landing and 8000 feet at 2250 RPM to represent cruise. Two multibody dynamics analyses are used: CAMRAD II and Dymore. The CAMRAD II model is a semi-span X-57 model with a modal representation for the wing/pylon system. The Dymore model is a semi-span wing...
Topics: NASA Technical Reports Server (NTRS), 15ab385273df4001b7461e10dab9cc8f,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), Johnson, Les, NASA Marshall Space Flight Center
The diversity in hydrologic models has historically led to great controversy on the 'correct' approach to process-based hydrologic modeling, with debates centered on the adequacy of process parameterizations, data limitations and uncertainty, and computational constraints on model analysis. In this paper, we revisit key modeling challenges on requirements to (1) define suitable model equations, (2) define adequate model parameters, and (3) cope with limitations in computing power. We outline...
Topics: NASA Technical Reports Server (NTRS), 1c21640aea4a40a39011a325bc36121c,...
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Jun 27, 2022 ConnorDawg
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You've heard stories about my greatness but have you actually seen me play? Today I'm going to reveal the success behind my chess skills and maybe it's something more than you thought of? Follow My Twitch: https://www.twitch.tv/cdawgva My Main YouTube: https://www.youtube.com/c/CDawgVA akaNemsko https://twitter.com/akanemsko https://www.twitch.tv/akanemsko Twitter: http://bit.ly/2fG2i5n Facebook: https://www.facebook.com/CDawgVA/ Discord: https://discord.gg/cdawgva Instagram:...
Topics: Youtube, video, People & Blogs, cdawgva, CDawgVA Streams, CDawgVA Highlights, CDawgVA Stream...
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The Venus atmosphere is extremely complex, and because of this the spectrum of Earths sister planet is likewise intricate and a challenge to model accurately. However, accurate modeling of Venus spectrum opens up multiple opportunities to better understand the planet next door, and even for understanding Venus-like planets beyond our solar system. Near-infrared (1-2.5 um, NIR) spectral windows observable on the Venus nigthside present the opportunity to probe beneath the Venusian cloud deck and...
Topics: NASA Technical Reports Server (NTRS), 37db5a3e939a447f8c4b62abee84f68e,...
This presentation will cover Radiation Hardness Assurance (RHA), and unique challenges for implementing RHA in small missions.
Topics: NASA Technical Reports Server (NTRS), Campola, Michael J., NASA Goddard Space Flight Center
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Jun 27, 2022 NASA Technical Reports Server (NTRS)
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Recent work for the NASA Electronic Parts and Packaging Program Power MOSFET task is presented. The Task technology focus, roadmap, and partners are given. Recent single-event effect test results on commercial, automotive, and radiation hardened trench power MOSFETs are summarized with an emphasis on risk of using commercial and automotive trench-gate power MOSFETs in space applications.
Topics: NASA Technical Reports Server (NTRS), 0eb59a1aa81a4fe2aa0e7958ffdfb825,...
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This presentation gives an overview of current NEPP tasks on ceramic and tantalum capacitors and plans for the future. It includes tasks on leakage currents, gas generation and case deformation in wet tantalum capacitors; ESR degradation and acceleration factors in MnO2 and polymer cathode capacitors. Preliminary results on the effect of moisture on degradation of reverse currents in MnO2 tantalum capacitors are discussed. Latest results on mechanical characteristics of MLCCs and modeling of...
Topics: NASA Technical Reports Server (NTRS), ASRC Federal Space and Defense, Teverovsky, Alexander A.
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Jun 27, 2022 NASA Technical Reports Server (NTRS)
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In this work, we discuss the observed single-event effects in a variety of types of diodes. In addition, we conduct failure analysis on several Schottky diodes that were heavy-ion irradiated. High- and low-magnitude optical microscope images, infrared camera images, and scanning electron microscope images are used to identify and describe the failure locations.
Topics: NASA Technical Reports Server (NTRS), 246c538f8e2a440a826d84387f12cf1c,...
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Jun 27, 2022 NASA Technical Reports Server (NTRS)
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This presentation will include information about Graphics Processor Units (GPUs) technology, NASA Electronic Parts and Packaging (NEPP) tasks, The test setup, test parameter considerations, lessons learned, collaborations, a roadmap, NEPP partners, results to date, and future plans.
Topics: NASA Technical Reports Server (NTRS), Lentech, Inc., Wyrwas, Edward J.
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This presentation will discuss in detail NASA Government Working Group government topics from NASA Electronic Parts Assurance Group (NEPAG) which require additional in-depth technical solutions.
Topics: NASA Technical Reports Server (NTRS), 75548ddc718d4e77a2feb256213b6148, Greenbelt, MD United...
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Jun 27, 2022 NASA Technical Reports Server (NTRS)
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This presentation will discuss in detail NASA Government Working Group government topics from NASA Electronic Parts Assurance Group (NEPAG) which require additional in-depth technical solutions.
Topics: NASA Technical Reports Server (NTRS), 7c4a157e939540ec88052e481f359c55,...
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A robust physics-based combined radar-radiometer, or Active-Passive, surface soil moisture and roughness estimation methodology is presented. Soil moisture and roughness retrieval is performed via optimization, i.e., minimization, of a joint objective function which constrains similar resolution radar and radiometer observations simultaneously. A data-driven and noise-dependent regularization term has also been developed to automatically regularize and balance corresponding radar and radiometer...
Topics: NASA Technical Reports Server (NTRS), 2da50a6d58d748f9aa8cc8dcc8713e90,...
High temperatures have substantial impacts on mortality and, with growing concerns about climate change, numerous studies have developed projections of future heat-related deaths around the world. Projections of temperature-related mortality are often limited by insufficient information necessary to formulate hypotheses about population sensitivity to high temperatures and future demographics. This study has derived projections of temperature-related mortality in New York City by taking into...
Topics: NASA Technical Reports Server (NTRS), 1023b14684b64826a6bad74d79128c25,...
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Future space mission concepts and designs pose many networking challenges for command, telemetry, and science data applications with diverse end-to-end data delivery needs. For future end-to-end architecture designs, a key challenge is meeting expected application quality of service requirements for multiple simultaneous mission data flows with options to use diverse onboard local data buses, commercial ground networks, and multiple satellite relay constellations in LEO, GEO, MEO, or even deep...
Topics: NASA Technical Reports Server (NTRS), 16e9005f2ef94963b46b2ef7eca3d9c8,...
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Additive manufacturing of a NiTi-20Hf high temperature shape memory alloy (HTSMA) was investigated. A selective laser melting (SLM) process by Phenix3D Systems was used to develop components from NiTiHf powder (of approximately 25-75 m particle fractions), and the thermomechanical response was compared to the conventionally vacuum induction skull melted counterpart. Transformation temperatures of the SLM material were found to be slightly lower due to the additional oxygen pick up from the gas...
Topics: NASA Technical Reports Server (NTRS), 00a0616b7a2e43a1a287970013d33060,...
Rotorcraft gearbox efficiencies are reduced at increased surface speeds due to viscous and impingement drag on the gear teeth. This windage power loss can affect overall mission range, payload, and frequency of transmission maintenance. Experimental and analytical studies on shrouding for single gears have shown it be potentially effective in mitigating windage power loss. Efficiency studies on unshrouded meshed gears have shown the effect of speed, oil viscosity, temperature, load, lubrication...
Topics: NASA Technical Reports Server (NTRS), b5c1e7518b3440cfb6c3b00d9c20ab2d, Cleveland, OH United...
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Jun 27, 2022 ConnorDawg
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Trash Taste is the highly successful podcast that I started with two other blokes and now it turns out that I'm not even the top dog anymore! My influence is being stripped away by none other than Gigguk himself! This is UNACCEPTABLE!!! Follow My Twitch: https://www.twitch.tv/cdawgva My Main YouTube: https://www.youtube.com/c/CDawgVA Twitter: http://bit.ly/2fG2i5n Facebook: https://www.facebook.com/CDawgVA/ Discord: https://discord.gg/cdawgva Instagram: http://bit.ly/2g1IZWM Video Editor and...
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An almost square patch, a square patch and a stacked square patch with corner truncation for circular polarization (CP) are researched and developed at X-band for cognitive radios. Experimental results indicate, first, that the impedance bandwidth of a CP almost square patch fed from the edge by a 50 ohm line is 1.70% and second, that of a CP square patch fed from the ground plane side by a surface launch connector is 1.87%. Third, the impedance bandwidth of a CP stacked square patch fed by a...
Topics: NASA Technical Reports Server (NTRS), 38ba1245de434b818a67617659ca2a72, Barbosa Kortright, Miguel...
The paper presents the architecture of a wideband reconfigurable harmonically-tuned Gallium Nitrate (GaN) Solid State Power Amplifier (SSPA) for cognitive radios. When interfaced with the physical layer of a cognitive communication system, this amplifier topology offers broadband high efficiency through the use of multiple tuned input/output matching networks. This feature enables the cognitive radio to reconfigure the operating frequency without sacrificing efficiency. This paper additionally...
Topics: NASA Technical Reports Server (NTRS), 3cd9542f37a847faac85876e94edf42b,...
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The San Joaquin Valley (SJV) suffers from severe health-endangering episodes of PM2.5 aerosol loadings in wintertime; episodes last approximately 5 days and differ in geographical distribution and composition. PM2.5 stations are scattered; consequently the use of remote sensing to map variable regional patterns of these varying respirable aerosol concentrations is desirable. High-precision AOT retrievals can capture column particulate loading. However,PM2.5 mapping is challenging due to several...
Topics: NASA Technical Reports Server (NTRS), 715399f968e4454194d0557b77c22870,...
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Jun 27, 2022 NASA Technical Reports Server (NTRS)
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The Unmanned Aircraft Systems (UAS) Traffic Management (UTM) Technical Capability Level (TCL) 2 software implements the UTM TCL 2 software requirements described herein. These software requirements are linked to the higher level UTM TCL 2 System Requirements. Each successive TCL implements additional UTM functionality, enabling additional use cases. TCL 2 demonstrated how to enable expanded multiple operations by implementing automation for beyond visual line-of-sight, tracking operations, and...
Topics: NASA Technical Reports Server (NTRS), 12389030997148a5be032654f7b4a55c,...
The chemical and microstructural behavior of steels (304, 310, 316, and 1018), nickel-based alloys (beta-NiAl, G30, and 625), gold, coatings (4YSZ, SilcoNert(TradeMark) 1040 (SilcoTek Co.), Dursan(TradeMark) (SilcoTek Co.), and porcelain), and bulk ceramics (alpha-Al2O3, fused quartz, beta-SiC, and alpha-Si3N4) were probed after exposure to supercritical fluid with temperature, pressure, and composition mimicking the Venus lower atmosphere. Exposures were carried out in the Glenn Extreme...
Topics: NASA Technical Reports Server (NTRS), 11008b3ada974bffa85db430d0bb9ef1,...
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Jun 26, 2022 ConnorDawg
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The New Pokémon Snap just came out so you know I want to get in on the action. I've been holding a camera since I was a wee lad, this on-rails picture taking game is no match for me! Follow My Twitch: https://www.twitch.tv/cdawgva My Main YouTube: https://www.youtube.com/c/CDawgVA Twitter: http://bit.ly/2fG2i5n Facebook: https://www.facebook.com/CDawgVA/ Discord: https://discord.gg/cdawgva Instagram: http://bit.ly/2g1IZWM Video Editor and casual paparazzi: https://twitter.com/MudanTV...
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Jun 26, 2022 ConnorDawg
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Install Raid for Free ✅ IOS/ANDROID/PC: https://clcr.me/nyr72g and get a special starter pack 💥 Available only for the next 30 days The fact that you can play Apex on a Switch is insane and of course your boy wants a piece of that cake and to show that I'm also the best portable gamer. I don't need a mouse and keyboard to be a champion! Follow My Twitch: https://www.twitch.tv/cdawgva My Main YouTube: https://www.youtube.com/c/CDawgVA Also check out @MahouShoujoRiri Twitter:...
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Jun 26, 2022 ConnorDawg
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Trash Taste is a popular podcast but is it searched more than CDawgVA? What about "Kelly Clarkson" vs "Jesus"? Well, we'll find out together during this Higher or Lower game where I will have to pick if something is googled more or less than the previous thing! Follow My Twitch: https://www.twitch.tv/cdawgva My Main YouTube: https://www.youtube.com/c/CDawgVA Twitter: http://bit.ly/2fG2i5n Facebook: https://www.facebook.com/CDawgVA/ Discord: https://discord.gg/cdawgva...
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Jun 26, 2022 ConnorDawg
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If you've seen Trash Taste then you might vaguely remember us talking about some childhood games and how I loved Theme Park World. Well, guess what, we're going to be playing that today and I'm going to be showing you the real way to manage a theme park! Follow My Twitch: https://www.twitch.tv/cdawgva My Main YouTube: https://www.youtube.com/c/CDawgVA Twitter: http://bit.ly/2fG2i5n Facebook: https://www.facebook.com/CDawgVA/ Discord: https://discord.gg/cdawgva Instagram: http://bit.ly/2g1IZWM...
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Jun 26, 2022 ConnorDawg
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After many tiresome nights, we have thankfully come to understand each other better and made up. Don't worry, we're not planning to leave you any time soon with many future videos already planned and more to come. We're thriving better than ever before! I am so glad that I met IronMouse who is a really good gamer and a partner that has my back. I'm happy that I was blessed with such a good friend! Follow My Twitch: https://www.twitch.tv/cdawgva My Main YouTube: https://www.youtube.com/c/CDawgVA...
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Jun 26, 2022 ConnorDawg
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As you know, games are my strong suite, I haven't lost a single life in any video game ever but what you might not have known is that I have a degree in numbers so to also show you how good I am at that, I will be taking on some math quizzes and proving that I'm better than a small child at some fairly basic equations. Follow My Twitch: https://www.twitch.tv/cdawgva My Main YouTube: https://www.youtube.com/c/CDawgVA Twitter: http://bit.ly/2fG2i5n Facebook: https://www.facebook.com/CDawgVA/...
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Jun 26, 2022 ConnorDawg
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Not going to lie, Apex Legends has taken over my life. Every time I'm doing the Trash Taste podcast, I just cant wait to finish and head home to play some more Apex. My channel editor, who is writing this description right now, is constantly frustrated at me too because I need to make more variety content to upload on the highlights channel but I only stream apex for days on end and even though my lovely editor even gave me a list of stream ideas to do that I quoted as being "banger",...
Topics: Youtube, video, People & Blogs, cdawgva, CDawgVA Streams, CDawgVA Highlights, CDawgVA Stream...
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Jun 26, 2022 ConnorDawg
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Chess is too easy for a big brain like myself, not even 3D chess can quench my thirst for adventure, this is why I set out to master 5D chess where the pieces move multidimensionally and defy time and space itself! Follow My Twitch: https://www.twitch.tv/cdawgva My Main YouTube: https://www.youtube.com/c/CDawgVA Twitter: http://bit.ly/2fG2i5n Facebook: https://www.facebook.com/CDawgVA/ Discord: https://discord.gg/cdawgva Instagram: http://bit.ly/2g1IZWM Video Editor and time traveler:...
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Jun 26, 2022 ConnorDawg
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Look, I know it might be difficult but we're willing to put our differences aside and make it work. We're doing couples counselling and giving our best to hang in there so will you do a solid for us and also be strong and supportive and of course the best way to support us is to, like, totally smash that like button! Follow My Twitch: https://www.twitch.tv/cdawgva My Main YouTube: https://www.youtube.com/c/CDawgVA 🐭 🐭 🐭 Follow IronMouse!...
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The reliance on non-permanent coatings in Condensing Heat Exchanger (CHX) designs is a significant technical issue to be solved before long-duration spaceflight can occur. Therefore, high reliability CHXs have been identified by the Evolvable Mars Campaign (EMC) as critical technologies needed to move beyond low earth orbit. The Laser Processed Condensing Heat Exchanger project aims to solve these problems through the use of femtosecond laser processed surfaces, which have unique wetting...
Topics: NASA Technical Reports Server (NTRS), 2e7c58344f064abe917c3d57be524f4f,...
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No abstract available
Topics: NASA Technical Reports Server (NTRS), 1b7215b083124a598611e0ccb3c02612,...
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Jun 26, 2022 NASA Technical Reports Server (NTRS)
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Johnson Space Center (JSC) provides research, engineering, development, integration, and testing of hardware and software technologies for exercise systems applications in support of human spaceflight. This includes sustaining the current suite of on-orbit exercise devices by reducing maintenance, addressing obsolescence, and increasing reliability through creative engineering solutions. Advanced exercise systems technology development efforts focus on the sustainment of crew's physical...
Topics: NASA Technical Reports Server (NTRS), NASA Johnson Space Center, Rafalik, Kerrie
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No abstract available
Topics: NASA Technical Reports Server (NTRS), 04fa6f5ee64843a98b1ea011a1c90754,...
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Jun 26, 2022 NASA Technical Reports Server (NTRS)
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An AdvancedExtravehicular Mobility Unit (EMU) is being developed and tested in house at JSC. Multiple programs over the last decade have contributed to the success thus far including the SBIR/STTR program.
Topics: NASA Technical Reports Server (NTRS), Chullen, Cinda, NASA Johnson Space Center
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Jun 26, 2022 NASA Technical Reports Server (NTRS)
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No abstract available
Topics: NASA Technical Reports Server (NTRS), NASA Johnson Space Center, Scheuring, Rick
The NASA Next Space Technologies for Exploration Partnerships (NextSTEP) program is a public-private partnership model that seeks commercial development of deep space exploration capabilities to support extensive human spaceflight missions around and beyond cislunar space. NASA first issued the Phase 1 NextSTEP Broad Agency Announcement to U.S. industries in 2014, which called for innovative cislunar habitation concepts that leveraged commercialization plans for low Earth orbit. These habitats...
Topics: NASA Technical Reports Server (NTRS), 04e93a021f0d45b2932fd0d36e2d1577,...
The Biologic Analog Science Associated with Lava Terrains (BASALT) project is a four-year program dedicated to iteratively designing, implementing, and evaluating concepts of operations (ConOps) and supporting capabilities to enable and enhance scientific exploration for future human Mars missions. The BASALT project has incorporated three field deployments during which real (non-simulated) biological and geochemical field science have been conducted at two high-fidelity Mars analog locations...
Topics: NASA Technical Reports Server (NTRS), 13195de62ee144848bbc48cc5c431ec9,...
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MSFC has a long history of developing full-shell grazing-incidence x-ray optics for both narrow (pointed) and wide field (surveying) applications. The concept presented in this paper shows the potential to use active optics to switch between narrow and wide-field geometries, while maintaining large effective area and high angular resolution. In addition, active optics has the potential to reduce errors due to mounting and manufacturing lightweight optics. The design presented corrects low...
Topics: NASA Technical Reports Server (NTRS), 96775d35356f404693b6eecc15b2e2ae,...
This paper presents two research applications exploiting unused metadata resources in novel ways to aid data discovery and exploration capabilities. The results based on the experiments are encouraging and each application has the potential to serve as a useful standalone component or service in a data system. There were also some interesting lessons learned while designing the two applications and these are presented next.
Topics: NASA Technical Reports Server (NTRS), 1dc78f7b0c3b413aacd94d3473846153,...
The international community is increasingly interested in returning humans to the Moon and this time establishing a permanent lunar base. There are several system level constraints that will drive the location for the base, chief among which are the need for continuous power and communications with the Earth. The NASA George C. Marshall Space Flight Center (MSFC) performed a study of placing an operational space based solar power station in lunar orbit to beam energy to the lunar base, or...
Topics: NASA Technical Reports Server (NTRS), Johnson, L., NASA Marshall Space Flight Center
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Jun 26, 2022 NASA Technical Reports Server (NTRS)
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In this talk we summarize the GEOS-5 capabilities to be deployed during the ORACLES 2016 Campaign. We describe model configuration, data products and web services available. We also discuss the measurement and flight requirements for the GEOS-5 Team.
Topics: NASA Technical Reports Server (NTRS), 10e942ea3e73405db8bdfd91b463894f, da Silva, Arlindo,...
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Ozone Monitoring Instrument (OMI) aboard NASA's Aura mission measures ozone column and profile, aerosols, clouds, surface UV irradiance, and the trace gases including NO2, SO2, HCHO, BrO, and OClO using UltraViolet electromagnetic spectrum (280 - 400 nm) with a daily global coverage and a pixel spatial resolution of 13 km × 24 km at nadir, and it's been one of the key instruments to study the Earth's atmospheric composition and chemistry. The second Modern-Era Retrospective analysis for...
Topics: NASA Technical Reports Server (NTRS), ab6c28f0255f45ec841de5821cf8e94f, Adnet Systems, Inc.,...
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The Convective Transport of Active Species in the Tropics (CONTRAST) experiment was conducted from Guam (13.5degN, 144.8degE) during January-February 2014. Using the NSF/NCAR Gulfstream V research aircraft, the experiment investigated the photochemical environment over the tropical western Pacific (TWP) warm pool, a region of massive deep convection and the major pathway for air to enter the stratosphere during Northern Hemisphere (NH) winter. The new observations provide a wealth of...
Topics: NASA Technical Reports Server (NTRS), 01c36f75dbff40b38ebdceaac44eaf1d,...
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Jun 26, 2022 NASA Technical Reports Server (NTRS)
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The purpose of this report is to document the results of a high-level qualitative study that was conducted to identify future aviation safety risks and to assess the potential impacts to the National Airspace System (NAS) of NASA Aviation Safety research on these risks. Multiple external sources (for example, the National Transportation Safety Board, the Flight Safety Foundation, the National Research Council, and the Joint Planning and Development Office) were used to develop a compilation of...
Topics: NASA Technical Reports Server (NTRS), Barr, Lawrence C., Federal Aviation Administration
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Protective ductile coatings will be necessary to mitigate oxidation and corrosion attack on superalloy disks exposed to increasing operating temperatures in some turbine engine environments. However, such coatings must be resistant to harmful surface cracking during service. The objective of this study was to investigate how residual stresses evolve in such coatings. Cylindrical gage fatigue specimens of powder metallurgy-processed disk superalloy LSHR were coated with a NiCrY coating, shot...
Topics: NASA Technical Reports Server (NTRS), 01f253b9df2e4cc3ad93bfcf1d484fa9,...
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Jun 26, 2022 ConnorDawg
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My dream has come true, I've somehow managed to assemble all kinds of JoJo's Bizarre Adventure voice actors to ask them everything I could ever want to know. You can follow everyone here: Philip Reich - https://twitter.com/PhillMReich Faye Mata - https://twitter.com/FayeMata Kellen Goff - https://twitter.com/kellengoff Mick Lauer - https://twitter.com/RicepirateMick Kira Buckland - https://twitter.com/KiraBuckland Follow My Twitch: https://www.twitch.tv/cdawgva My Main YouTube:...
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Methods for relating or mapping estimates of volumetric Bone Mineral Density (vBMD) obtained by Quantitative Computed Tomography to Bone Volume Fraction (BVF) are outlined mathematically. The methods are based on definitions of bone properties, cited experimental studies and regression relations derived from them for trabecular bone in the proximal femur. Using an experimental range of values in the intertrochanteric region obtained from male and female human subjects, age 18 to 49, the BVF...
Topics: NASA Technical Reports Server (NTRS), 5d65cd2fb7b346a28d8b5b7e3b18fec2, Cleveland, OH United...
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Jun 26, 2022 NASA Technical Reports Server (NTRS)
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The Integrated Power, Avionics and Software (IPAS) software defined radio (SDR) was implemented on the Reconfigurable, Intelligently-Adaptive Communication System (RAICS) platform, for radio development at NASA Johnson Space Center. Software and hardware description language (HDL) code were delivered by NASA Glenn Research Center for use in the IPAS test bed and for development of their own Space Telecommunications Radio System (STRS) waveforms on the RAICS platform. The purpose of this...
Topics: NASA Technical Reports Server (NTRS), 7f4d3eda2de24ac2a9479adbeaa23943, Cleveland, OH United...
The main focus of this study is to apply a computational tool for the flow analysis of the turbine engine that has been tested with ice crystal ingestion in the Propulsion Systems Laboratory (PSL) at NASA Glenn Research Center. The PSL has been used to test a highly instrumented Honeywell ALF502R-5A (LF11) turbofan engine at simulated altitude operating conditions. Test data analysis with an engine cycle code and a compressor flow code was conducted to determine the values of key icing...
Topics: NASA Technical Reports Server (NTRS), 414cb184520549dfa0c7b1b272043438,...
Aviation technologies and concepts have reached a level of maturity that may soon enable an era of on-demand mobility (ODM) fueled by quiet, efficient, and largely automated air taxis. However, successfully bringing such a system to fruition will require introducing orders of magnitude more aircraft to a given airspace volume than can be accommodated by the traditional air traffic control system, among other important technical challenges. The airspace integration problem is further compounded...
Topics: NASA Technical Reports Server (NTRS), 82e5cd024d7e4d85800a49395286494c,...
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Jun 26, 2022 NASA Technical Reports Server (NTRS)
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This study investigated the effects of viewing a primary flight display at different retinal eccentricities on human manual control behavior and performance. Ten participants performed a pitch tracking task while looking at a simplified primary flight display at different horizontal and vertical retinal eccentricities, and with two different controlled dynamics. Tracking performance declined at higher eccentricity angles and participants behaved more nonlinearly. The visual error rate gain...
Topics: NASA Technical Reports Server (NTRS), 36b8805c3ad14eeeb479281fbfe4b8da, Moffett Field, CA, United...
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A computational study of the wing for the distributed electric propulsion X-57 Maxwell airplane configuration at cruise and takeoff/landing conditions was completed. Two unstructured-mesh, Navier-Stokes computational fluid dynamics methods, FUN3D and USM3D, were used to predict the wing performance. The goal of the X-57 wing and distributed electric propulsion system design was to meet or exceed the required lift coefficient 3.95 for a stall speed of 58 knots, with a cruise speed of 150 knots...
Topics: NASA Technical Reports Server (NTRS), 12f8bfd07a8f4781ab6634e05ce087bb,...
A variety of tools, from fundamental to high order, have been used to better understand applications of distributed electric propulsion to aid the wing and propulsion system design of the Leading Edge Asynchronous Propulsion Technology (LEAPTech) project and the X-57 Maxwell airplane. Three high-fidelity, Navier-Stokes computational fluid dynamics codes used during the project with results presented here are FUN3D, STAR-CCM+, and OVERFLOW. These codes employ various turbulence models to predict...
Topics: NASA Technical Reports Server (NTRS), 2e09e22a70804a6e8f6a06b4805275e8,...
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The Federal Aviation Administration (FAA) and European Aviation Safety Agency (EASA) have recently established new light aircraft certification rules that introduce significant changes to the current regulations. The changes include moving from prescriptive design requirements to performance-based standards, transferring many of the acceptable means of compliance out of the rules and into consensus standards. In addition, the FAA/EASA rules change the performance requirements associated with...
Topics: NASA Technical Reports Server (NTRS), Borer, Nicholas K., NASA Langley Research Center
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The interaction of an off-body laser discharge with a hemisphere cylinder in supersonic flow is investigated. The objectives are 1) experimental determination of the drag reduction and energetic efficiency of the laser discharge, and 2) assessment of the capability for accurate simulation of the interaction. The combined computational and experimental study comprises two phases. In the first phase, laser discharge in quiescent air was examined. The temporal behavior of the shock wave formed by...
Topics: NASA Technical Reports Server (NTRS), 1b8829403dc04177af2cc70911eb2c36,...
It has been well-known that under the assumption of a constant uniform mean flow, the acoustic wave propagation equation can be formulated as a boundary integral equation, in both the time domain and the frequency domain. Compared with solving partial differential equations, numerical methods based on the boundary integral equation have the advantage of a reduced spatial dimension and, hence, requiring only a surface mesh. However, the constant uniform mean flow assumption, while convenient for...
Topics: NASA Technical Reports Server (NTRS), 812677f3ea224dd7b6226e7040b1ca36,...
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A novel radical shape change approach (Aerodynamically Actuated Radical Shape Change concept) was developed at NASA Langley Research Center. The radical shape change enables cruise at a lowered altitude of 15-25,000 feet and yields substantial performance and environmental benefits. This lowered altitude has however raised concerns in the community due to past experience with decreased ride quality in this altitude range. This paper describes the analysis performed by the team to address this...
Topics: NASA Technical Reports Server (NTRS), 689bba01cb1b47748098855d80b45190,...
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The aerodynamic drag of acoustic liners has become a significant topic in the design of such for aircraft noise applications. In order to evaluate the benefits of concepts designed to reduce liner drag, it is necessary to establish the baseline performance of liners employing the typical design features of conventional configurations. This paper details a set of experiments in the NASA Langley Grazing Flow Impedance Tube to quantify the relative drag of a number of perforate-over-honeycomb...
Topics: NASA Technical Reports Server (NTRS), 2cec64b7d1ae4a1aa9baf7e60afcf83f, Hampton, VA, United States,...
There is a drive to devise acoustic treatments with reduced skin-friction and therefore fuel-burn penalty for engine nacelles on commercial airplanes. The studies have been experimental, and the effects on skin-friction are deduced from measurements of the pressure drop along a duct. We conduct a detailed CFD analysis of the installation, for two purposes. The first is to predict the effects of the finite size of the rig, including its near-square cross-section and the moderate length of the...
Topics: NASA Technical Reports Server (NTRS), Boeing Commercial Airplane Co.,...
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Jun 26, 2022 NASA Technical Reports Server (NTRS)
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Aerodynamically-actuated radical shape change (AARSC) is a novel concept that enables flight vehicles to conduct a mission profile containing radically different flight regimes while possibly mitigating the typical penalties incurred by radical geometric change. Weight penalties are mitigated by utilizing a primary flight control to generate aerodynamic loads that then drive a shape-change actuation. The flight mission profile used to analyze the AARSC concept is that of a transport aircraft...
Topics: NASA Technical Reports Server (NTRS), 80b1a35382f54002bae4de98fa0207c9, Ancel, Ersin, Atlanta, GA,...
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Jun 26, 2022 NASA Technical Reports Server (NTRS)
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Mid-air collision risk continues to be a concern for manned aircraft operations, especially near busy non-towered airports. The use of Detect and Avoid (DAA) technologies and draft standards developed for unmanned aircraft systems (UAS), either alone or in combination with other collision avoidance technologies, may be useful in mitigating this collision risk for manned aircraft. This paper describes a NASA research effort known as DANTi (DAA iN The Cockpit), including the initial development...
Topics: NASA Technical Reports Server (NTRS), 060bf6d2be034494b9fc568ae7be7808,...
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The use of acoustic liners has proven to be extremely effective in reducing aircraft engine fan noise transmission/radiation. However, the introduction of advanced fan designs and shorter engine nacelles has highlighted a need for novel acoustic liner designs that provide increased fan noise reduction over a broader frequency range. To achieve aggressive noise reduction goals, advanced broadband liner designs, such as zone liners and variable impedance liners, will likely depart from...
Topics: NASA Technical Reports Server (NTRS), 4f4435c596f84affa1b3a5970fc5d93b, Hampton, VA, United States,...
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Rising traffic density, along with autonomy and diversity of vehicles in the air, will fundamentally change the safety environment of the future air transportation system. The change in risk is two-fold: increasing chances of mid-air collisions with non-cooperative objects and increasing chances of crashes over highly populated areas. The changing nature of the vehicles populating the airspace means that civilian aircraft design must now explicitly include considerations of survivability in the...
Topics: NASA Technical Reports Server (NTRS), Alexandrov, Natalia M., NASA Langley Research Center
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For the past several years, researchers at NASA Langley have been engaged in a series of projects to study the degree to which existing facilities and capabilities, originally created for work on full-scale aircraft, are extensible to smaller scales --those of the small unmanned aerial systems (sUAS, also UAVs and, colloquially, `drones') that have been showing up in the nation's airspace of late. This paper follows an e ort that has led to an initial human{subject psychoacoustic test regarding...
Topics: NASA Technical Reports Server (NTRS), 5becdfc24d5343d48ed9936f57d25096, Cabell, Randolph,...
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NASA's research into distributed electric propulsion (DEP) includes the design and development of the X-57 Maxwell aircraft. This aircraft has two distinct types of DEP: wingtip propellers and high-lift propellers. This paper focuses on the unique opportunities and challenges that the high-lift propellers--i.e., the small diameter propellers distributed upstream of the wing leading edge to augment lift at low speeds--bring to the aircraft performance in approach conditions. Recent changes to...
Topics: NASA Technical Reports Server (NTRS), 8431ab32c1f942368414b6a0102a0070, Borer, Nicholas K.,...
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The mesh adaptation functionality of FUN3D is utilized to obtain a mesh optimized to calculate sonic boom ground signature loudness. During this process, the coupling between the discrete-adjoints of the computational fluid dynamics tool FUN3D and the atmospheric propagation tool sBOOM is exploited to form the error estimate. This new mesh adaptation methodology will allow generation of suitable meshes adapted to reduce the estimated errors in the ground loudness, which is an optimization...
Topics: NASA Technical Reports Server (NTRS), ceafa936bc3e416889a852fd6be71152, Hampton, VA, United States,...
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Jun 26, 2022 NASA Technical Reports Server (NTRS)
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This paper outlines the process of developing a parametric model for a vehicle that can withstand Earth launch and Mars entry conditions. This model allows the user to change a variety of parameters ranging from dimensions and meshing to materials and atmospheric entry angles to perform finite element analysis on the model for the specified load cases. While this work focuses on an aeroshell for Earth launch aboard the Space Launch System (SLS) and Mars entry, the model can be applied to...
Topics: NASA Technical Reports Server (NTRS), Ahmed, Samee W., f04a03c751774cf88be49d4498a4aad7, Hampton,...
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Jun 26, 2022 NASA Technical Reports Server (NTRS)
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This work considers an aeroelastic wingbox model seeded with run-out blade stiffeners along the skins. Topology optimization is conducted within the shell webs of the stiffeners, in order to add cutouts and holes for mass reduction. This optimization is done with a global-local approach in order to moderate the computational cost: aeroelastic loads are computed at the wing-level, but the topology and sizing optimization is conducted at the panel-level. Each panel is optimized separately under...
Topics: NASA Technical Reports Server (NTRS), NASA Langley Research Center, Stanford, Bret K.
Direct numerical simulations (DNS) of flow over an NACA-0012 airfoil are performed at a low and a moderate Reynolds numbers of Re(sub c)=50 times10(exp 3) and 1times 10(exp 6). The angles of attack are 5 and 15 degrees at the low and the moderate Reynolds number cases respectively. The three-dimensional unsteady compressible Navier-Stokes equations are solved using higher order compact schemes. The flow field in the low Reynolds number case consists of a long separation bubble near the...
Topics: NASA Technical Reports Server (NTRS), Balakumar, P., NASA Langley Research Center
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Roughness is unavoidable on practical high-speed vehicles, so it is critical to determine its impact on boundary layer transition. The flow field downstream of a streamwise array of cylindrical roughness elements is probed with hot-wire anemometry in this experiment. Mean flow distortion is examined in several measurement planes in the wake of the cylindrical roughness using the streak strength profiles and contour plots of the mass flux and total temperature. The roughness element heights and...
Topics: NASA Technical Reports Server (NTRS), 002e0375f5ac4b22826f2632d37d0de2, Chou, Amanda, Hampton, VA,...
The Low Speed Aeroacoustic Wind Tunnel (LSAWT) at NASA Langley Research Center has recently undergone a configuration change. This change incorporates an inlet nozzle extension meant to serve the dual purposes of achieving lower free-stream velocities as well as a larger core flow region. The LSAWT, part of the NASA Langley Jet Noise Laboratory, had historically been utilized to simulate realistic forward flight conditions of commercial and military aircraft engines in an anechoic environment....
Topics: NASA Technical Reports Server (NTRS), 0ad1155df7dc45f481093c13bac85398, Hampton, VA, United States,...
A computational study of a distributed electric propulsion wing with a 40deg flap deflection has been completed using FUN3D. Two lift-augmentation power conditions were compared with the power-off configuration on the high-lift wing (40deg flap) at a 73 mph freestream flow and for a range of angles of attack from -5 degrees to 14 degrees. The computational study also included investigating the benefit of corotating versus counter-rotating propeller spin direction to powered-lift performance....
Topics: NASA Technical Reports Server (NTRS), 8858a4eabda14d45999d257300b1a995,...
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The structure that is developed and analyzed in this project must be able to survive all the various load conditions that it will encounter along its course to Mars with the minimal amount of weight and material. At this stage, the goal is to study the capability of the structure using a finite element model (FEM). This FEM is created using a python script, and is numerically solved in Nastran. The purpose of the model is to achieve an optimization of mass given specific constraints on launch...
Topics: NASA Technical Reports Server (NTRS), 35c27b7ae945492bbc812a47d3fa06ce, Ahmed, Samee W., Hampton,...
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Jun 26, 2022 ConnorDawg
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As many of you know, I'm a pro Apex gamer and TODAY IS THE DAY when I put all of my gaming skills to the test to impress a gamer girl! Let's get that W! Follow My Twitch: https://www.twitch.tv/cdawgva My Main YouTube: https://www.youtube.com/c/CDawgVA Follow Lilimaru: https://www.twitch.tv/lilimaruriri Twitter: http://bit.ly/2fG2i5n Facebook: https://www.facebook.com/CDawgVA/ Discord: https://discord.gg/cdawgva Instagram: http://bit.ly/2g1IZWM Video Editor and fellow Apex addict:...
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Without a pilot onboard an aircraft, a Detect-and-Avoid (DAA) system, in conjunction with surveillance sensors, must be used to provide the remotely-located Pilot-in-Command sufficient situational awareness in order to keep the Unmanned Aircraft (UA) safely separated from other aircraft. To facilitate safe operations of UA within the U.S.' National Airspace System, the uncertainty associated with surveillance sensors must be accounted for. An approach to mitigating the impact of sensor...
Topics: NASA Technical Reports Server (NTRS), 0acd0ebe24db4a42afb4f1d83d47c4af,...
An experimental investigation of the effects of distributed surface roughness on boundary-layer transition and turbulent heating has been conducted. Hypersonic wind tunnel testing was performed using hemispherical models with surface roughness patterns simulating those produced by heat shield ablation. Global aeroheating and transition onset data were obtained using phosphor thermography at Mach 6 and Mach 10 over a range of roughness heights and free stream Reynolds numbers sufficient to...
Topics: NASA Technical Reports Server (NTRS), Hollis, Brian R., NASA Langley Research Center
Results from the testing of cylinder test article SBKF-P2-CYL-TA02 (referred to herein as TA02) are presented. TA02 is an 8-foot-diameter (96-inches), 78.0-inch-long, aluminum-lithium (Al-Li), orthogrid-stiffened cylindrical shell similar to those used in current state-of-the-art launch-vehicle structures and was designed to exhibit global buckling when subjected to combined compression and bending loads. The testing was conducted at the Marshall Space Flight Center (MSFC), February 3-6, 2009,...
Topics: NASA Technical Reports Server (NTRS), 266143a1ca9142b3a29b440314a9b562,...
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Jun 26, 2022 NASA Technical Reports Server (NTRS)
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FLOPS has been the primary aircraft synthesis software used by the Aeronautics Systems Analysis Branch at NASA Langley Research Center. It was created for rapid conceptual aircraft design and advanced technology impact assessments. FLOPS is a single computer program that includes weights estimation, aerodynamics estimation, engine cycle analysis, propulsion data scaling and interpolation, detailed mission performance analysis, takeoff and landing performance analysis, noise footprint...
Topics: NASA Technical Reports Server (NTRS), 53bd8b3d1f6047e7a0fa409e6d700a33,...
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Topics: NASA Technical Reports Server (NTRS), 4001bb415d00477fa766b5a94e92c2ce,...
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Review of flight operations and research conducted at Kennedy Space Center
Topics: NASA Technical Reports Server (NTRS), Johansen, Michael, NASA Kennedy Space Center
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Jun 26, 2022 NASA Technical Reports Server (NTRS)
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Athena is designed to implement the Hot and Energetic Universe science theme selected by the European Space Agency for the second large mission of its Cosmic Vision program. The Athena science payload consists of a large aperture high angular resolution X-ray optics (2 m2 at 1 keV) and twelve meters away, two interchangeable focal plane instruments: the X-ray Integral Field Unit (X-IFU) and the Wide Field Imager. The X-IFU is a cryogenic X-ray spectrometer, based on a large array of Transition...
Topics: NASA Technical Reports Server (NTRS), 037dce914cf145e398dcbf4b5d6fbf64,...
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Jun 26, 2022 NASA Technical Reports Server (NTRS)
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We present a gridded inventory of US anthropogenic methane emissions with 0.1 deg x 0.1 deg spatial resolution, monthly temporal resolution, and detailed scale dependent error characterization. The inventory is designed to be onsistent with the 2016 US Environmental Protection Agency (EPA) Inventory of US Greenhouse Gas Emissionsand Sinks (GHGI) for 2012. The EPA inventory is available only as national totals for different source types. We use a widerange of databases at the state, county,...
Topics: NASA Technical Reports Server (NTRS), 03d91cd9b30d4569b5e32a21e1cba8aa,...
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The currently available services at the Goddard Earth Sciences Data Information Services Center (GES DISC) only allow users to select variables from a single data set at a time. Because entire variables from a data set are often displayed, user selection of variables of interest can be overwhelming. At the American Geophysical Union (AGU) 2016 Fall Meeting, GES DISC unveiled a new service called Datalist: a collection of predefined or user-defined data variables from one or more archived data...
Topics: NASA Technical Reports Server (NTRS), 1ad10ba3bb2b4a4c8c1d0f906ea3f538,...
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Landslides can have significant and pervasive impacts to life and property around the world. Several attempts have been made to predict the geographic distribution of landslide activity at continental and global scales. These efforts shared common traits such as resolution, modeling approach, and explanatory variables. The lessons learned from prior research have been applied to build a new global susceptibility map from existing and previously unavailable data. Data on slope, faults, geology,...
Topics: NASA Technical Reports Server (NTRS), 0be91b7a68665cf882c2ccee8ad03aff, Thomas Stanley,...
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NASA Goddard Earth Sciences (GES) Data and Information Services Center (DISC) archives and distributes rich collections of data on atmospheric greenhouse gases from multiple missions. Hosted data include those from the Atmospheric Infrared Sounder (AIRS) mission (which has observed CO2, CH4, ozone, and water vapor since 2002); legacy water vapor and ozone retrievals from TIROS Operational Vertical Sounder (TOVS); and Upper Atmosphere Research Satellite (UARS) going back to the early 1980s. GES...
Topics: NASA Technical Reports Server (NTRS), 31f6228fd0ff411ea1767c20bde350af,...
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Jun 26, 2022 ConnorDawg
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Sekiro is debatably one of the hardest games in the existence of mankind but I'm no man, I'm a full fledged monke who has no issues winning these easy human games! Bet, I will finish Sekiro with 0 deaths and only wins! Follow My Twitch: https://www.twitch.tv/cdawgva My Main YouTube: https://www.youtube.com/c/CDawgVA Twitter: http://bit.ly/2fG2i5n Facebook: https://www.facebook.com/CDawgVA/ Discord: https://discord.gg/cdawgva Instagram: http://bit.ly/2g1IZWM Video Editor and fellow pro...
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