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  • 1
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    Departure Energies, Trip Times and Entry Speeds for Human Mars Missions (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The study examines how the mission design variables departure energy, entry speed, and trip time vary for round-trip conjunction-class Mars missions. These three parameters must be balanced in order to produce a mission that is acceptable in terms of mass, cost, and risk. For the analysis, a simple, massless- planet trajectory program was employed. The premise of this work is that if the trans-Mars and trans-Earth injection stages are designed for the most stringent opportunity in the energy cycle, then there is extra energy capability in the "easier" opportunities which can be used to decrease the planetary entry speed, or shorten the trip time. Both of these effects are desirable for a human exploration program.
    Keywords: Astronautics (General)
    Type: AAS Paper 99-103 , Space Flight Mechanics; Feb 07, 1999 - Feb 10, 1999; Breckenridge, CO; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Development Challenges of Game-Changing Entry System Technologies from Concept to Mission Infusion (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Realization within the US and NASA that future exploration both Human and Robotic will require innovative new technologies led to the creation of the Space Technology Mission Directorate and investment in game changing technologies with high pay-off. Some of these investments will see success and others, due to many of the constraints, will not attain their goal. The co-authors of this proposed presentation have been involved from concept to mission infusion aspects of entry technologies that are game changing. The four example technologies used to describe the challenges experienced along the pathways to success are at different levels of maturity. They are Conformal, 3-D MAT, HEEET and ADEPT. The four examples in many ways capture broad aspects of the challenges of maturation and illustrate what led some to be exceptionally successful and how others had to be altered in order remain viable game changing technologies. Subsystem technologies for robotic and human missions
    Keywords: Space Transportation and Safety; Engineering (General)
    Type: ARC-E-DAA-TN24168 , International Planetary Probe Workshop; Jun 15, 2015 - Jun 19, 2015; Cologne; Germany
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Overview of a Proposed Flight Validation of Aerocapture System Technology (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Aerocapture is a very useful capability for NASA that can be used across a wide range of planetary mission sizes and destinations. A substantial mass advantage may be realized through aerocapture maneuver implementation. The mass advantage is enabling for certain outer planet mission profiles. Aerocapture technology provides corollary benefits to the related applications of atmospheric entry and precision landing on worlds with atmospheres through aero/aerothermodynamic model validation, hypersonic guided flight, tps materials, and performance model validation. The ST9 Aerocapture flight validation will be sufficient to immediately infuse aerocapture technology into future NASA science missions. The advanced technologies being flight validated will enable the system level goal of performing an aerocapture maneuver. The advanced technologies include: The GN&C System, TPS materials, plus Advanced recession and heat flux sensors.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: M09-0147 , 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit; Jul 10, 2006 - Jul 12, 2006; Sacramento, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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