SEARCH · Engineering Papers
Results for “Astronaut”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Predicting Orion Pad Abort Vibrations to Keep Astronauts Safe
No abstract available
Long Term Behavioral Health Surveillance of Former Astronauts at the NASA Johnson Space Center
No abstract available
Flexible Sensor Development for Astronaut Crew Health Monitoring
Explore the source record for details and available documents.
Supporting Astronaut Autonomous Operations in Future Deep Space Missions
Explore the source record for details and available documents.
Astronaut Magnetic Anchoring System
Explore the source record for details and available documents.
How Veggies Grow (and Make NASA Astronauts Feel) in Space!
An outreach talk about growing plants in space aimed at teachers and students with an introduction to how I because a plant space researcher.
2020 International Astronautical Congress Conference Presentation - ANALYTICAL TECHNIQUES FOR ASSESSING GATEWAY AND OTHER SPACECRAFT ANTENNA LINE-OF-SIGHT FOR THE ARTEMIS PROGRAM
NASA’s Artemis program is committed to landing the next man and the first woman on the Moon by 2024. The Gateway, a critical piece of infrastructure for the long-term Artemis mission profiles, will inaugurate a sustainable crewed presence beyond low-Earth orbit in cis-lunar space and serve as a staging point for a lunar landing system. The Near Rectilinear Halo Orbit of the Gateway offers numerous operational benefits in terms of its Earth access via the Orion Multipurpose Crew Vehicle, its degree of Earth and lunar visibility, the versatile surface access it provides, and favorable conditions for station-keeping. To minimize burns during station-keeping and conserve propellant, the Gateway will continually align itself to a solar pressure equilibrium attitude with the Sun; this is convenient for solar array orientation and power generation, but causes difficulties in terms of communication line-of-sight with the Earth, Moon, and visiting vehicles, which appear to be continually rotating about the Gateway’s local frame. A fixed antenna on the Gateway is continually subject to a moving target and can find itself obstructed by the Gateway’s own geometry frequently if not placed carefully. To understand the performance of either Earth-pointing or Moon-pointing antenna placements for a given Gateway geometry, a transient solar system simulation of the Gateway is used to step through orbital ephemeris data and determine the periods in which line-of-sight to a chosen target is achieved and lost. Antenna placements can be tested in the simulation and optimized to increase the average line-of-sight exposure to the target, while also minimizing the maximum duration drop-out in line-of-sight communication experienced; long durations without a successful communication link could pose threats to operations, safety, and mission success. It may be necessary to deviate from the Gateway’s solar pressure equilibrium attitude for short periods of time in order to continue a successful line-of-sight link to a chosen target. Communication coverage spheres can offer insight into what these necessary attitude adjustments may be and are generated by using a 3D mesh of the Gateway and an implementation of the Möller-Trumbore intersection algorithm. This paper outlines the analytical techniques used to perform such antenna placements on the Gateway, offering examples of how line-of-sight strength can be enhanced with an understanding of the Gateway geometry and attitude constraints. These techniques have had direct impact on the writing of communication requirements for NASA and international partner-owned Gateway elements.
Crew Earth Observations: ISS payload for astronaut photography of Earth
Explore the source record for details and available documents.
Human Stress During Spaceflight Implications and Countermeasures for Astronauts
Explore the source record for details and available documents.
A Miniature Quadrupole Mass Spectrometer Array and GC For Space Flight: Astronaut Eva and Cabin-Air Monitoring
A miniature quadrupole mass spectrometer array has been designed and built for NASA flight missions.
A Miniature Quadrupole Mass Spectrometer Array and GC For Space Flight: Astronaut EVA and Cabin-Air Monitoring
A miniature quadrupole mass spectrometer array and gas chromatograph have been designed and built for NASA flight missions.
Protecting Astronauts from Space Radiation on the Lunar Surface
Explore the source record for details and available documents.