Download or read book A Study of the Earth Return Aerocapture for a Manned Mars Mission written by William Donald Muth and published by . This book was released on 2000 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physiologically Constrained Aerocapture for Manned Mars Missions written by James Evans Lyne and published by . This book was released on 1992 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Earth Return Aerocapture for the TransHab Ellipsled Vehicle written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-30 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current architecture being considered by NASA for a human Mars mission involves the use of an aerocapture procedure at Mars arrival and possibly upon Earth return. This technique would be used to decelerate the vehicles and insert them into their desired target orbits, thereby eliminating the need for propulsive orbital insertions. The crew may make the interplanetary journey in a large, inflatable habitat known as the TransHab. It has been proposed that upon Earth return, this habitat be captured into orbit for use on subsequent missions. In this case, the TransHab would be complimented with an aeroshell, which would protect it from heating during the atmospheric entry and provide the vehicle with aerodynamic lift. The aeroshell has been dubbed the "Ellipsled" because of its characteristic shape. This paper reports the results of a preliminary study of the aerocapture of the TransHab/Ellipsled vehicle upon Earth return. Undershoot and overshoot boundaries have been determined for a range of entry velocities, and the effects of variations in the atmospheric density profile, the vehicle deceleration limit, the maximum vehicle roll rate, the target orbit, and the vehicle ballistic coefficient have been examined. A simple, 180 degree roll maneuver was implemented in the undershoot trajectories to target the desired 407 km circular Earth orbit. A three-roll sequence was developed to target not only a specific orbital energy, but also a particular inclination, thereby decreasing propulsive inclination changes and post-aerocapture delta-V requirements. Results show that the TransHab/Ellipsled vehicle has a nominal corridor width of at least 0.7 degrees for entry speeds up to 14.0 km/s. Most trajectories were simulated using continuum flow aerodynamics, but the impact of high-altitude viscous effects was evaluated and found to be minimal. In addition, entry corridor comparisons have been made between the TransHab/Ellipsled and a modified Apollo capsule which
Download or read book Physiologically Constrained Aerocapture for Manned Mars Missions written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-11-18 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerobraking has been proposed as a critical technology for manned missions to Mars. The variety of mission architectures currently under consideration presents aerobrake designers with an enormous range of potential entry scenarios. Two of the most important considerations in the design of an aerobrake are the required control authority (lift-to-drag ratio) and the aerothermal environment which the vehicle will encounter. Therefore, this study examined the entry corridor width and stagnation-point heating rate and load for the entire range of probable entry velocities, lift-to-drag ratios, and ballistic coefficients for capture at both Earth and Mars. To accomplish this, a peak deceleration limit for the aerocapture maneuvers had to be established. Previous studies had used a variety of load limits without adequate proof of their validity. Existing physiological and space flight data were examined, and it was concluded that a deceleration limit of 5 G was appropriate. When this load limit was applied, numerical studies showed that an aerobrake with an L/D of 0.3 could provide an entry corridor width of at least 1 degree for all Mars aerocaptures considered with entry velocities up to 9 km/s. If 10 km/s entries are required, an L/D of 0.4 to 0.5 would be necessary to maintain a corridor width of at least 1 degree. For Earth return aerocapture, a vehicle with an L/D of 0.4 to 0.5 was found to provide a corridor width of 0.7 degree or more for all entry velocities up to 14.5 km/s. Aerodynamic convective heating calculations were performed assuming a fully catalytic, 'cold' wall; radiative heating was calculated assuming that the shock layer was in thermochemical equilibrium. Heating rates were low enough for selected entries at Mars that a radiatively cooled thermal protection system might be feasible, although an ablative material would be required for most scenarios. Earth return heating rates were generally more severe than those encountered by the Apollo vehicles, ...
Download or read book Human Missions to Mars written by Donald Rapp and published by Springer Nature. This book was released on 2023-01-01 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, Donald Rapp looks at human missions to Mars from a technological perspective. He divides the mission into a number of stages: Earth’s surface to low-Earth orbit (LEO); departing from LEO toward Mars; Mars orbit insertion and entry, descent and landing; ascent from Mars; trans-Earth injection from Mars orbit and Earth return. A mission to send humans to explore the surface of Mars has been the ultimate goal of planetary exploration since the 1950s, when von Braun conjectured a flotilla of 10 interplanetary vessels carrying a crew of at least 70 humans. Since then, more than 1,000 studies were carried out. This third edition provides extensive updating and additions to the last edition, including new sections, and many new figures and tables, and references.
Download or read book Human Exploration of Mars written by Stephen J. Hoffman and published by . This book was released on 1997 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Personnel representing several NASA field centers have formulated a "Reference Mission" addressing human exploration of Mars. Summarizes their work and describes a plan for the first human missions to Mars, using approaches that are technically feasible, have reasonable risks, and have relatively low costs. The architecture for the Mars Reference Mission builds on previous work of the Synthesis Group (1991) and Zubrin's (1991) concepts for the use of propellants derived from the Martian Atmosphere. In defining the Reference Mission, choices have been made. The rationale for each choice is documented; however, unanticipated technology advances or political decisions might change the choices in the future.
Download or read book Mission to Mars written by James E. Oberg and published by Stackpole Books. This book was released on 2017-09-15 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: How feasible is a manned Mars flight? How soon will it be possible? How long will it take? What kind of spacecraft will make the journey? What kind of data will be collected? What are the advantages of a manned flight over an unmanned? Mission to Mars discusses these questions and more in this serious, documented treatment of the not-too-distant manned expedition to Mars. The shuttle has proved successful and an enthusiastic boost to American interest in space. But while many laypeople wonder “what’s next,” scientists are planning what they feel is the next logical step. Drawing on the vast amount of data sent back by Viking orbiters and probes, and existing developments in propulsion and space technology, space experts all over have been speculating, analyzing, and exchanging ideas relative to the long-awaited mission to Mars. Other factors, critical to an intelligent discussion of such an undertaking are included here: spaceship design and assembly, propulsion systems, navigation principles, life support systems, selecting a landing site, scientific activities on Mars, cost factors, political and social issues.
Download or read book Mars The Next Step written by Arthur E. Smith and published by CRC Press. This book was released on 2021-02-27 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: The conquest of Earth's moon was merely a precursor to a more dramatic step forward, which will take men and women to an outpost that might eventually become a second home for the human race. Mars: The Next Step illustrates how the only feasible colonization of another planet in our solar system will be on Mars. The author addresses the various questions surrounding this theory with frank scientific caution that in no way obscures his vigorous enthusiasm and, above all, optimism for mankind's future in space. This vivid and entertaining book explores "terraforming" (planetary engineering), which could turn Mars into a more congenial environment for humans, both in terms of changing the harsh climate of the planet and the production of plants able to thrive there by means of genetic engineering. The book includes numerous diagrams of possible manned spacecraft, along with color pictures of Mars taken on previous unmanned missions.
Download or read book Effect of Interplanetary Trajectory Options on a Manned Mars Aerobrake Configuration written by Robert D. Braun and published by . This book was released on 1990 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Leadership and America s Future in Space written by Sally Ride and published by . This book was released on 1987 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interplanetary Mission Design Handbook written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-18 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper provides information for trajectory designers and mission planners to determine Earth-Mars and Mars-Earth mission opportunities for the years 2009-2024. These studies were performed in support of a human Mars mission scenario that will consist of two cargo launches followed by a piloted mission during the next opportunity approximately 2 years later. "Porkchop" plots defining all of these mission opportunities are provided which include departure energy, departure excess speed, departure declination arrival excess speed, and arrival declinations for the mission space surrounding each opportunity. These plots are intended to be directly applicable for the human Mars mission scenario described briefly herein. In addition, specific trajectories and several alternate trajectories are recommended for each cargo and piloted opportunity. Finally, additional studies were performed to evaluate the effect of various thrust-to-weight ratios on gravity losses and total time-of-flight tradeoff, and the resultant propellant savings and are briefly summarized. George, L. E. and Kos, L. D. Marshall Space Flight Center EARTH-MARS TRAJECTORIES; TRAJECTORY PLANNING; INTERPLANETARY FLIGHT; MANNED SPACE FLIGHT; MISSION PLANNING; HANDBOOKS; MANNED MARS MISSIONS; MARS EXPLORATION; THRUST-WEIGHT RATIO; TRADEOFFS; CARGO SPACECRAFT; RETURN TO EARTH SPACE FLIGHT; NASA SPACE PROGRAMS...
Download or read book Manned Mars Mission Accommodation Sprint Mission written by and published by . This book was released on 1988 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeroassisted vehicle Design Studies for a Manned Mars Mission written by and published by . This book was released on 1987 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Problems in Atmosphere Entry and Landing for Manned Planetary Missions written by Clarence A. Syvertson and published by . This book was released on 1969 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mars Sample Return Mission written by James R. French and published by . This book was released on 1986 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Parametric Entry Corridors for Lunar mars Aerocapture Missions written by Lisa Ling and published by . This book was released on 1991 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mars to the ISS written by Kristi Murphy and published by . This book was released on 2005 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
