La NASA probará tecnología para medir las singulares ondas de choque del X-59

Read this story in English here.

La NASA pronto pondrá a prueba los avances realizados en una herramienta clave para medir los singulares ‘golpes sónicos’ que su avión supersónico silencioso de investigación X-59 producirá durante el vuelo.

Una sonda de detección de impactoses una sonda de datos de aire en forma cónica desarrollada con características específicas para capturar las singulares ondas de choque que producirá el X-59. Investigadores del Centro de Investigación de Vuelo Armstrong de la NASA en Edwards, California, desarrollaron dos versiones de la sonda para recopilar datos precisos de presión durante el vuelo supersónico. Una de las sondas está optimizada para mediciones de campo cercano, capturando las ondas de choque que se producen muy cerca de donde las generará el X-59. La segunda sonda de detección de impactos medirá el centro del campo y recopilará datos a altitudes de entre 5.000 y 20.000 pies por debajo del avión.

Cuando un avión vuela a velocidades supersónicas, genera ondas de choque que viajan a través del aire circundante, produciendo fuertes estampidos sónicos. El X-59 está diseñado para desviar esas ondas de choque, reduciendo los fuertes estampidos sónicos a golpes sónicos más silenciosos. Durante los vuelos de prueba, un avión F-15B con una sonda de detección de impactos acoplada a su morro volará con el X-59. La sonda, de aproximadamente 1,80 metros (6 pies), recolectará continuamente miles de muestras de presión por segundo, captando los cambios de presión del aire mientras vuela a través de ondas de choque. Los datos de los sensores serán vitales para validar los modelos informáticos que predicen la fuerza de las ondas de choque producidas por el X-59, la pieza central de la misión Quesst de la NASA.

“Una sonda de detección de impactos actúa como fuente de la verdad, comparando los datos previstos con las mediciones del mundo real”, dijo Mike Frederick, investigador principal de la NASA para la sonda.

Para la sonda de campo cercano, el F-15B volará cerca del X-59 a su altitud de crucero de aproximadamente 18.000 metros (55.000 pies), utilizando una configuración de “seguir al líder” que permitirá a los investigadores analizar ondas de choque en tiempo real. La sonda de campo medio, destinada para misiones separadas, recopilará datos más útiles a medida que las ondas de choque viajen más cerca al suelo.

La capacidad de las sondas para captar pequeños cambios de presión es especialmente importante para el X-59, ya que se espera que sus ondas de choque sean mucho más débiles que las de la mayoría de los aviones supersónicos. Al comparar los datos de las sondas con las predicciones de modelos de computadora avanzados, los investigadores pueden evaluar con mayor precisión.

“Las sondas tienen cinco puertos de presión, uno en la punta y cuatro alrededor del cono”, explica Frederick. “Estos puertos miden los cambios de presión estática a medida que el avión vuela a través de las ondas de choque, lo que nos ayuda a comprender las características de choque de un avión en particular”. Estos puertos combinan sus mediciones para calcular la presión local, la velocidad y la dirección del flujo de aire.

Los investigadores pronto evaluarán actualizaciones de la sonda de detección de impactos de campo cercano a través de vuelos de prueba, en los que la sonda, montada en un F-15B, recopilará datos persiguiendo a un segundo F-15 durante un vuelo supersónico. Las actualizaciones de la sonda incluyen la colocación de los transductores de presión – dispositivos que miden la presión del aire en el cono – a sólo 5 pulgadas de sus puertos. Los diseños anteriores colocaban esos transductores a casi 3 metros (12 pies) de distancia, lo que retrasaba el tiempo de grabación y distorsionaba las mediciones.

La sensibilidad a la temperatura de los diseños anteriores también presentó un desafío, ya que provocó fluctuaciones en la precisión cuando cambiaban las condiciones. Para solucionar esto, el equipo diseñó un sistema de calefacción para mantener los transductores de presión a una temperatura constante durante el vuelo.

“La sonda cumplirá los requisitos de resolución y precisión de la misión Quesst”, afirmó Frederick. “Este proyecto muestra cómo la NASA puede tomar tecnología existente y adaptarla para resolver nuevos desafíos”.

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NASA Technologies Aim to Solve Housekeeping’s Biggest Issue – Dust

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NASA Technologies Aim to Solve Housekeeping’s Biggest Issue – Dust

If you thought the dust bunnies under your sofa were an issue, imagine trying to combat dust on the Moon. Dust is a significant challenge for astronauts living and working on the lunar surface. So, NASA is developing technologies that mitigate dust buildup enabling a safer, sustainable presence on the Moon. 

A flight test aboard a suborbital rocket system that will simulate lunar gravity is the next step in understanding how dust mitigation technologies can successfully address this challenge. During the flight test with Blue Origin, seven technologies developed by NASA’s Game Changing Development program within the agency’s Space Technology Mission Directorate will study regolith mechanics and lunar dust transport in a simulated lunar gravity environment. 

Why Is Lunar Dust a Problem?

With essentially no atmosphere, dust gets lofted, or lifted by the surface, by a spacecraft’s plumes as it lands on the lunar surface. But it can also be lofted through electrostatic charges. Lunar dust is electrostatic and ferromagnetic, meaning it adheres to anything that carries a charge.

Kristen John, NASA’s Lunar Surface Innovation Initiative technical integration lead at Johnson Space Center said, “The fine grain nature of dust contains particles that are smaller than the human eye can see, which can make a contaminated surface appear to look clean.”

Although lunar dust can appear smooth with a powder like finish, its particles actually have a jagged shape. Lunar dust can scratch everything from a spacesuit to human lungs. Dust can also prevent hardware from surviving the lunar night when it accumulates on solar panels causing a reduction in available power. A buildup of dust coats thermal radiators, increasing the temperature of the equipment. Lunar dust can also accumulate on windows, camera lenses, and visors leading to obscured vision.

Dirty Moon? Clean It Up.

The projects being tested on the lunar gravity flight with Blue Origin include ClothBot, Electrostatic Dust Lofting (EDL), and Hermes Lunar-G.

ClothBot

When future astronauts perform extra-vehicular activities on the lunar surface they could bring dust into pressurized, habitable areas. The goal of the ClothBot experiment is to mimic and measure the transport of lunar dust as releases from a small patch of spacesuit fabric. When agitated by pre-programmed motions, the compact robot can simulate “doffing,” the movement that occurs when removing a spacesuit. A laser-illuminated imaging system will capture the dust flow in real-time, while sensors record the size and number of particles traveling through the space. This data will be used to understand dust generation rates inside a lander or airlock from extra-vehicular activity and refine models of lunar dust transport for future lunar and potential Martian missions.
 

Electrostatic Dust Lofting

This technology will examine the lofting of lunar dust when electrostatic charging occurs after exposure to ultraviolet light. The EDL’s camera with associated lights will record and illuminate for the duration of the flight. During the lunar gravity phase of the flight, a vacuum door containing the dust sample will release and the ultraviolet light source will illuminate the substance, charging the grains until they electrostatically repel one another and become lofted. The lofted dust will pass through a sheet laser as it rises up from the surface. When the lunar gravity phase ends, the ultraviolet light source disables, and the camera will continue recording until the end of the flight. This data will inform dust mitigation modeling efforts for future Moon missions.

Hermes Lunar-G

NASA partnered with Texas A&M and Texas Space Technology Applications and Research (T STAR) to develop Hermes Lunar-G, technology that utilizes flight-proven hardware to conduct experiments with regolith simulants. Hermes was previously a facility on the International Space Station. Hermes Lunar-G repurposed Hermes hardware to study lunar regolith simulants. The Hermes Lunar-G technology uses four canisters to compress the simulants during flight, takeoff, and landing. When the technology is in lunar gravity, it will decompress the contents of the canisters while high-speed imagery and sensors capture data. Results of this experiment will provide information on regolith mechanics that can be used in a variety of computational models. The results of Hermes Lunar-G will be compared to microgravity data from the space station as well as similar data acquired from parabolic flights for lunar and microgravity flight profiles.

The Future of Dust Mitigation

As a primary challenge of lunar exploration, dust mitigation influences several NASA technology developments. Capabilities from In-Situ Resource Utilization to surface power and mobility, rely on some form of dust mitigation, making it a cross-cutting area.

Learning some of the fundamental properties of how lunar dust behaves and how lunar dust impacts systems has implications far beyond dust mitigation and environments. Advancing our understanding of the behavior of lunar dust and advancing our dust mitigation technologies benefits most capabilities planned for use on the lunar surface.»

Kristen John

NASA’s Lunar Surface Innovation Initiative Technical Integration Lead

Engineering teams perform a variety of tests to mitigate dust, ensuring it doesn’t cause damage to hardware that goes to the Moon. NASA’s Game Changing Development program, created a reference guide for lunar dust mitigation to help engineers build hardware destined for the lunar surface.

NASA’s Flight Opportunities program funded the Blue Origin flight test as well as the vehicle capability enhancements to enable the simulation of lunar gravity during suborbital rocket flight for the first time. The payloads are managed under NASA’s Game Changing Development program within the agency’s Space Technology Mission Directorate.

To learn more visit: https://www.nasa.gov/stmd-game-changing-development/

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NASA Outlines Latest Moon to Mars Plans in 2024 Architecture Update

As NASA develops a blueprint for space exploration throughout the solar system for the benefit of humanity, the agency released several new documents Friday updating its Moon to Mars architecture. The roadmap sets NASA on course for long-term lunar exploration under the Artemis campaign in preparation for future crewed missions to Mars.  

Following an Architecture Concept Review, the 2024 updates include a revision of NASA’s Architecture Definition Document which details technical approaches and processes of the agency’s exploration plans, an executive overview, and 12 new white papers on key Moon to Mars topics.  

“NASA’s Architecture Concept Review process is critical to getting us on a path to mount a human mission to Mars,” said NASA Associate Administrator Jim Free. “We’re taking a methodical approach to mapping out the decisions we need to make, understanding resource and technological trades, and ensuring we are listening to feedback from stakeholders.”   

One newly released white paper highlights NASA’s decision to use fission power as the primary source of power on the Martian surface to sustain crews — the first of seven key decisions necessary for human Mars exploration. Fission power is a form of nuclear power unaffected by day and night cycles or potential dust storms on Mars. 

New additions this year also include a broader, prioritized list of key architecture decisions that need to be made early in NASA’s plans to send humans to the Red Planet. Two new elements are now part of the agency’s Moon to Mars architecture — a lunar surface cargo lander and an initial lunar surface habitat. The lunar surface cargo lander will deliver logistics items, science and technology payloads, communications systems, and more. The initial surface habitat will house astronauts on the lunar surface to extend the crew size, range, and duration of exploration missions and enable crewed and uncrewed science opportunities. 

The newest revision of the Architecture Definition Document adds more information about NASA’s decision road mapping process — how the agency decides which decisions must be made early in the planning process based on impacts to subsequent decisions — and a list of architecture-driven opportunities that help technology development organizations prioritize research into new technologies that will enable the Moon to Mars architecture. 

“Identifying and analyzing high-level architecture decisions are the first steps to realizing a crewed Mars exploration campaign,” said Catherine Koerner, associate administrator, Exploration Systems Development Mission Directorate, NASA Headquarters in Washington. “Each yearly assessment cycle as part of our architecture process is moving us closer to ensuring we have a well thought out plan to accomplish our exploration objectives.” 

NASA’s Moon to Mars architecture approach incorporates feedback from U.S. industry, academia, international partners, and the NASA workforce. The agency typically releases a series of technical documents at the end of its annual analysis cycle, including an update of the Architecture Definition Document and white papers that elaborate on frequently raised topics.  

Under NASA’s Artemis campaign, the agency will establish the foundation for long-term scientific exploration at the Moon, land the next Americans and first international partner astronaut on the lunar surface, and prepare for human expeditions to Mars for the benefit of all.  

For NASA’s Moon to Mars architecture documents, visit:  

https://www.nasa.gov/moontomarsarchitecture

-end-

Rachel Kraft / Kathryn Hambleton
Headquarters, Washington
202-358-1600
rachel.h.kraft@nasa.gov / kathryn.a.hambleton@nasa.gov

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Hubble Images a Grand Spiral

This NASA/ESA Hubble Space Telescope image features the glorious spiral galaxy NGC 5643, which is located roughly 40 million light-years away in the constellation Lupus, the Wolf. NGC 5643 is a grand design spiral, which refers to the galaxy’s symmetrical form with two large, winding spiral arms that are clearly visible. Bright-blue stars define the galaxy’s spiral arms, along with lacy reddish-brown dust clouds and pink star-forming regions.

As fascinating as the galaxy appears at visible wavelengths, some of NGC 5643’s most interesting features are invisible to the human eye. Ultraviolet and X-ray images and spectra of NGC 5643 show that the galaxy hosts an active galactic nucleus: an especially bright galactic core powered by a feasting supermassive black hole. When a supermassive black hole ensnares gas from its surroundings, the gas collects in a disk that heats up to hundreds of thousands of degrees. The superheated gas shines brightly across the electromagnetic spectrum, but especially at X-ray wavelengths.

NGC 5643’s active galactic nucleus isn’t the brightest source of X-rays in the galaxy, though. Researchers using ESA’s XMM-Newton discovered an even brighter X-ray-emitting object, called NGC 5643 X-1, on the galaxy’s outskirts. What could be a more powerful source of X-rays than a supermassive black hole? Surprisingly, the answer appears to be a much smaller black hole! While the exact identity of NGC 5643 X-1 is unknown, evidence points to a black hole that is about 30 times more massive than the Sun. Locked in an orbital dance with a companion star, the black hole ensnares gas from its stellar companion, creating a superheated disk that outshines the NGC 5643’s galactic core.

NGC 5643 was also the subject of a previous Hubble image. The new image incorporates additional wavelengths of light, including the red color that is characteristic of gas heated by massive young stars.

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Media Contact:

Claire Andreoli (claire.andreoli@nasa.gov)
NASA’s Goddard Space Flight Center, Greenbelt, MD

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6DOF Check Cases

This article is from the 2024 Technical Update.

In 2015, the NESC released benchmark Earth-based check-cases for well specified, rigid-body, six-degree-of-freedom (6DOF) aero/spacecraft models to promote consistent and accurate flight simulations across multiple Agency tools and facilities. Recently, the NESC expanded upon that effort to add Lunar-based check-cases to support new lunar exploration initiatives. This study produced a smaller, focused set of cases that exercise new and unique features of missions in the lunar environment in comparison with 8 high-fidelity NASA simulation tools and provides a measure of validation for simulations supporting Human Landing Systems.

Results
The primary output of the check-cases is a time history of each output variable, which can then be plotted with any data plotting software. For simulation comparison, the results from multiple simulations are
plotted together. A static website was developed as a tool for the simulation groups to perform quick data comparison using interactive plots,access scenario specifications, and catalogue the results.

Benefits for the FM Community
Utilizing benchmarking check-cases improves the simulations being assessed, reduces errors, builds confidence in solutions, and serves to build credibility of simulation results per NASA Standard 7009A Standard for Models and Simulations. Simulation comparisons can benefit from utilizing common standards for defining parameters and sharing models and elevates the validation for critical simulations used to support insight or requirement compliance through analysis.

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