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  • 1
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    Integrated controls-structures optimization of a large space structure (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: General-purpose control and structural codes are applied to a large detailed structural model including objective and constraint functions derived from actual design specifications. The approach is to divide the problem into a controls optimization step, a structural optimization step, and a system level coordination step. The objective is to minimize mass and power consumption with constraints on vibration characteristics, strength, and damping. This decomposition and optimization approach significantly enhances the design of a structure based on the COFS-I Mast Flight System, which is selected as a demonstration problem.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Computers and Structures (ISSN 0045-7949); 42; 725-732
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    International Space Station Radiation Shielding Model Development (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-10
    Description: The projected radiation levels within the International Space Station (ISS) have been criticized by the Aerospace Safety Advisory Panel in their report to the NASA Administrator. Methods for optimal reconfiguration and augmentation of the ISS shielding are now being developed. The initial steps are to develop reconfigurable and realistic radiation shield models of the ISS modules, develop computational procedures for the highly anisotropic radiation environment, and implement parametric and organizational optimization procedures. The targets of the redesign process are the crew quarters where the astronauts sleep and determining the effects of ISS shadow shielding of an astronaut in a spacesuit. The ISS model as developed will be reconfigurable to follow the ISS. Swapping internal equipment rack assemblies via location mapping tables will be one option for shield optimization. Lightweight shield augmentation materials will be optimally fit to crew quarter areas using parametric optimization procedures to minimize the augmentation shield mass. The optimization process is being integrated into the Intelligence Synthesis Environment s (ISE s) immersive simulation facility at the Langley Research Center and will rely on High Performance Computing and Communication (HPCC) for rapid evaluation of shield parameter gradients.
    Keywords: Space Transportation and Safety
    Type: Paper 01ICES-2370
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    OLTARIS - Overview and Recent Updates (2015)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The On-Line Tool for the Assessment of Radiation in Space (OLTARIS) is a web-based set of tools and models that allow engineers and scientists to assess the effects of space radiation in spacecraft, habitats, rovers, and spacesuits. The site is intended to be a design tool for those studying the effects of space radiation for current and future missions as well as a research tool for those developing advanced material and shielding concepts. The tools and models are built around the HZETRN radiation transport code and are currently focused on human-related responses. OLTARIS was deployed in 2008. Since that time, many improvements and additional capabilities have been added to the site. The purpose of this poster/presentation is to give an overview of the current capabilities of OLTARIS and focus on the updates to the site since the last workshop presentation in 2014. OLTARIS currently has 240 active accounts - 87 accounts are government (including NASA, ORNL, JPL, AFRL, and FAA), 76 are university professors/researchers/students, and 51 are industry (including Boeing, Space X, Lockheed-Martin, ATK, Northrup Grumman, and Bigelow Aerospace). There have been 14,000 jobs run through OLTARIS since counting began in November 2009. ITAR restrictions were recently reversed, so the site is now available to registered users worldwide.
    Keywords: Space Radiation; Documentation and Information Science
    Type: NF1676L-19918 , Annual Space Radiation Investigator''s Workshop; Jan 12, 2015 - Jan 15, 2015; Galveston, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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