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  • Lunar and Planetary Science and Exploration  (1)
  • Man/System Technology and Life Support  (1)
  • Spacecraft Design, Testing and Performance; Composite Materials; Fluid Mechanics and Thermodynamics
  • 2010-2014  (2)
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  • 1
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    Estimating Mass of Inflatable Aerodynamic Decelerators Using Dimensionless Parameters (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper describes a technique for estimating mass for inflatable aerodynamic decelerators. The technique uses dimensional analysis to identify a set of dimensionless parameters for inflation pressure, mass of inflation gas, and mass of flexible material. The dimensionless parameters enable scaling of an inflatable concept with geometry parameters (e.g., diameter), environmental conditions (e.g., dynamic pressure), inflation gas properties (e.g., molecular mass), and mass growth allowance. This technique is applicable for attached (e.g., tension cone, hypercone, and stacked toroid) and trailing inflatable aerodynamic decelerators. The technique uses simple engineering approximations that were developed by NASA in the 1960s and 1970s, as well as some recent important developments. The NASA Mars Entry and Descent Landing System Analysis (EDL-SA) project used this technique to estimate the masses of the inflatable concepts that were used in the analysis. The EDL-SA results compared well with two independent sets of high-fidelity finite element analyses.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Paper No. IPPW-8-6B , NF1676L-12864 , 8th International Planetary Probe Workshop 2011 (IPPW-8); Jun 06, 2011 - Jun 10, 2011; Portsmouth, VA; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Multidisciplinary Tool for Systems Analysis of Planetary Entry, Descent, and Landing (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Systems analysis of a planetary entry (SAPE), descent, and landing (EDL) is a multidisciplinary activity in nature. SAPE improves the performance of the systems analysis team by automating and streamlining the process, and this improvement can reduce the errors that stem from manual data transfer among discipline experts. SAPE is a multidisciplinary tool for systems analysis of planetary EDL for Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Titan. It performs EDL systems analysis for any planet, operates cross-platform (i.e., Windows, Mac, and Linux operating systems), uses existing software components and open-source software to avoid software licensing issues, performs low-fidelity systems analysis in one hour on a computer that is comparable to an average laptop, and keeps discipline experts in the analysis loop. SAPE uses Python, a platform-independent, open-source language, for integration and for the user interface. Development has relied heavily on the object-oriented programming capabilities that are available in Python. Modules are provided to interface with commercial and government off-the-shelf software components (e.g., thermal protection systems and finite-element analysis). SAPE currently includes the following analysis modules: geometry, trajectory, aerodynamics, aerothermal, thermal protection system, and interface for structural sizing.
    Keywords: Man/System Technology and Life Support
    Type: LAR-17821-1 , NASA Tech Briefs, September 2011; 44
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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