Author: Robert D. BraunPublisher:
ISBN:
Category : Aerothermodynamics
Languages : en
Pages : 84
Book Description
Effect of Interplanetary Trajectory Options on a Manned Mars Aerobrake Configuration
Author: Robert D. BraunPublisher:
ISBN:
Category : Aerothermodynamics
Languages : en
Pages : 84
Book Description
The Effect of Interplanetary Trajectory Options on a Manned Mars Aerobrake Configuration
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781722807658
Category :
Languages : en
Pages : 80
Book Description
Manned Mars missions originating in low Earth orbit (LEO) in the time frame 2010 to 2025 were analyzed to identify preferred mission opportunities and their associated vehicle and trajectory characteristics. Interplanetary and Mars atmospheric trajectory options were examined under the constraints of an initial manned exploration scenario. Two chemically propelled vehicle options were considered: (1) an all propulsive configuration, and (2) a configuration which employs aerobraking at Earth and Mars with low lift/drag (L/D) shapes. Both the interplanetary trajectory options as well as the Mars atmospheric passage are addressed to provide a coupled trajectory simulation. Direct and Venus swingby interplanetary transfers with a 60 day Mars stopover are considered. The range and variation in both Earth and Mars entry velocity are also defined. Two promising mission strategies emerged from the study: (1) a 1.0 to 2.0 year Venus swingby mission, and (2) a 2.0 to 2.5 year direct mission. Through careful trajectory selection, 11 mission opportunities are identified in which the Mars entry velocity is between 6 and 10 km/sec and Earth entry velocity ranges from 11.5 to 12.5 km/sec. Simulation of the Earth return aerobraking maneuver is not performed. It is shown that a low L/D configuration is not feasible for Mars aerobraking without substantial improvements in the interplanetary navigation system. However, even with an advanced navigation system, entry corridor and aerothermal requirements restrict the number of potential mission opportunities. It is also shown that for a large blunt Mars aerobrake configuration, the effects of radiative heating can be significant at entry velocities as low as 6.2 km/sec and will grow to dominate the aerothermal environment at entry velocities above 8.5 km/sec. Despite the additional system complexity associated with an aerobraking vehicle, the use of aerobraking was shown to significantly lower the required initial LEO weight. In compari...
Effect of Interplanetary Trajectory Options on a Manned Mars Aerobrake Configuration
Author: Robert D. BraunPublisher:
ISBN:
Category : Aerothermodynamics
Languages : en
Pages : 84
Book Description
International Exploration of Mars
Author: Aspects of Parking Orbit Selection in a Manned Mars Mission
Author: Prasun N. DesaiPublisher:
ISBN:
Category : Astrodynamics
Languages : en
Pages : 36
Book Description
In this investigation, which considers precession effects, minimum initial LEO masses were obtained for parking orbits characterized by having near-equatorial inclinations, high eccentricities, and three-dimensional departure burns. Shows that there are a set of orbits characterized by low to moderate essentricities (e = 0.2 to 0.5) and nonequatorial inclinations (i = 70° to 140°) that reduce the initial LEO mass penalty. Therefore, careful selection of a parking orbit at Mars can enhance the potential for satisfying science requirements with minimal mass penalties.
NASA Technical Paper
Author: United States. National Aeronautics and Space AdministrationPublisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 656
Book Description
NASA Technical Paper
Author: Aerobraking Characteristics for Several Potential Manned Mars Entry Vehicles
Author: Paul V. TartabiniPublisher:
ISBN:
Category : Mars (Planet)
Languages : en
Pages : 38
Book Description
Aerobraking Characteristics for Several Potential Manned Mars Entry Vehicles
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781722052553
Category :
Languages : en
Pages : 30
Book Description
While a reduction in weight is always desirable for any space vehicle, it is crucial for vehicles to be used in the proposed Manned Mars Mission (MMM). One such way to reduce a spacecraft's weight is through aeroassist braking which is an alternative to retro-rockets, the traditional method of slowing a craft approaching from a high energy orbit. In this paper aeroassist braking was examined for two blunt vehicle configurations and one streamlined configuration. For each vehicle type, a range of lift-to-drag ratios was examined and the entry angle windows, bank profiles, and trajectory parameters were recorded here. In addition, the sensitivities of velocity and acceleration with respect to the entry angle and bank angles were included. Also, the effect of using different atmosphere models was tested by incorporating several models into the simulation program. Tartabini, Paul V. and Suit, William T. Langley Research Center RTOP 506-46-21-01...
Author: