Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 26 for “"Extravehicular Activity"”.
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Dynamic analysis of astronaut motions during extravehicular activity
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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Psychophysiological Monitoring of Crew State for Extravehicular Activity
A spacewalk, or extravehicular activity (EVA), is one of the most mission critical and physically and cognitively challenging tasks that crewmembers complete. With next-generation missions to the Moon and Mars, exploration EVA will challenge crewmembers in partial gravity environments with …
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Biomechanics of extravehicular activity and its neutral buoyancy simulation
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 1987
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Space suit simulator for partial gravity extravehicular activity experimentation and training
During human space exploration, mobility is extremely limited when working inside a pressurized space suit. Astronauts perform extensive training on Earth to become accustomed to space suit-imposed high joint torques and limited range of motion. Space suit experimentation is difficult for …
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Understanding human-space suit interaction to prevent injury during extravehicular activity
Extravehicular Activity (EVA) is a critical component of human spaceflight. Working in gas-pressurized space suits, however, causes fatigue, unnecessary energy expenditure, and injury. The problem of injury is particularly acute and is exacerbated with the additional hours astronauts spend training …
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A vibrotactile display for aiding extravehicular activity (EVA) navigation in space
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1998.
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Hand grip performance with the bare hand in the extravehicular activity globe
… hand fatigue, and hand/forearm pain during extravehicular activities. This study was conducted to examine hand grip performance with a bare hand and in a spacesuit glove at two different pressures, with three hand positions and two elbow positions. Sixteen subjects, selected from the …
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Astronaut Extravehicular Activity : safety, injury & countermeasures; &, Orbital collisions & space debris : incidence, impact & international policy
Extravehicular Activity (EVA) spacesuits are a key enabling technology which allow astronauts to survive and work in the harsh environment of space. Of the entire spacesuit, the gloves may perhaps be considered the most difficult engineering design issue. A significant number of astronauts sustain …
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Astronaut-centric analysis of a jetpack with integrated control-moment gyroscopes for enhanced extravehicular activity performance
… control moment gyroscopes (CMGs) into an extravehicular activity (EVA) jetpack device currently being considered at NASA Johnson Space Center (JSC). This Mobility Augmenting Jetpack with Integrated CMGs (MAJIC) system will offer rigid attitude control not previously required for EVA tasks. …
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An operational feasibility assessment for extravehicular activity in human spaceflight under communication delay using an underwater research analogue
… planning and execution of mission tasks such as extravehicular activity (EVA) will emerge. One such challenge will be the mitigation of risks associated with communication delay between Earth and remote exploration crews. This paper provides an introduction to the problem of EVA operations under …
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Engineering a robotic exoskeleton for space suit simulation
… inherent to space suits, a key factor impacting extravehicular activity performance. The MIT Man-Vehicle Laboratory and Aurora Flight Sciences designed and built an actively controlled exoskeleton for space suit simulation called the Extravehicular Activity Space Suit Simulator (EVA S3), which …
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Investigation of a Cable-Driven Parallel Mechanism for Pressure Suit Arm Resizing and Motion Assistance
… Maryland has conducted research into a resizable Extravehicular Activity (EVA) suit. This resizing is accomplished through a series of cable-driven parallel manipulators, which are used to adjust the distance between plates and rings built into a soft space suit. These actuators, as well as …
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Hypertension Screening of Commercial Divers from an Occupational Medicine Perspective
… divers who provide underwater support during extravehicular activity training (EVAs, commonly referred to as 'Spacewalks') for astronauts. The NBL occupational health program requires regular "work-site" physical exams, including blood pressure checks, on at least a weekly basis. Although some …
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An investigation of space suit mobility with applications to EVA operations
… capabilities and limitations in space-suited extravehicular activity (EVA) by compiling a detailed database of the torques needed to bend the joints of a space suit, developing models of the mechanics of space suit joints based on experimental data, and utilizing these models to estimate a …
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Design and utility assessment of attitude control systems for EVA task performance
Low gravity astronaut extravehicular activity (EVA) missions using a maneuvering Jetpack and robotic servicing and assembly missions could benet from spacecraft systems capable of maintaining pointing stability during critical operations. The addition of single-gimbal control moment gyroscopes …
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The bioenergetics of walking and running in space suits
Space-suited activity is critical for human spaceflight, and is synonymous with human planetary exploration. Space suits impose kinematic and kinetic boundary conditions that affect movement and locomotion, and in doing so modify the metabolic cost of physical activity. Metabolic requirements, …
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Human factors and telerobotics : tools and approaches for designing remote robotic workstation displays
… the International Space Station, the number of Extravehicular Activity (EVA) hours is expected to increase by a factor of four over the current Space Shuttle missions, resulting in higher demands on the EVA crewmembers and EVA crew systems. One approach to utilizing EVA resources more …
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Development of astronaut reorientation methods : a computational and experimental study
… can be a crucial safety countermeasure during extravehicular activity. In this thesis, computational and experimental methods are developed to create and analyze astronaut reorientation methods. The computational development of control methods for human motion planning offers a novel way to …
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Design and evaluation of elements of a life support system for mechanical counterpressure spacesuits
… being developed at MIT primarily for planetary extravehicular activity (EVA) on the Moon and Mars. In this thesis we present the initial design and testing of several key parts of the life support system for the BioSuit[superscript TM]. First, a breathing compensation bladder that covers the …
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Environmental design guidelines for a second generation, LEO, permanently manned space station
… of "instant real estate", and the inherent lower Extravehicular Activity (EVA) time resulting in a higher margin of crew safety. This thesis is a continuation of the groundwork laid by the SSDW into the design criteria and implementation strategy for the living habitat of a six man Space Station. …
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