This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Evaluating Spacecraft Radiation Shielding Using a Microcomputer-Based CAD Program
Annotation ability available
Sector:
Language:
English
Abstract
This paper describes a new microcomputer-based program that evaluates the radiation shielding of spacecraft or Space Station modules. This program runs on a computer-aided design (CAD) system that constructs and manipulates models of spacecraft. It uses the graphical and geometrical functions of the CAD system to analyse the radiation shielding provided by spacecraft models. The program has the following new features:
-
It uses solid angles of equal size that are distributed uniformly over a sphere surrounding the point of interest;
-
It computes the geometrical intersection of each solid angle with a specified layer of a spacecraft model;
-
It computes the volume, centroid and average thickness of each intersection, along with the variance of its volume and the standard error of its centroid position;
-
It writes computer files of both the solid model and its volume, centroid and average thickness for each intersection for a given dose point and shielding layer.
When combined with composition and density data, the results provide input to existing radiation analysis programs. The total radiation shielding in a spacecraft or Space Station model corresponds to a superposition of shielding for all of the layers comprising a model. The archived intersections help in detailed analyses of shielding distributions. The new program obtains average shielding thicknesses in each solid angle element. These average thicknesses represent shielding more accurately than shielding computations that use single rays to determine the thickness for each solid angle element. The program runs on microcomputer and CAD workstations, providing flexible and cost-effective evaluations of radiation shielding distributions.
Authors
Citation
Kern, J., "Evaluating Spacecraft Radiation Shielding Using a Microcomputer-Based CAD Program," SAE Technical Paper 921371, 1992, https://doi.org/10.4271/921371.Also In
References
- Atwell, W. Beever E. R. Hardy A. C. Richmond R. G. Cash B. L. “Space Radiation Shielding Analysis and Dosimetry for the Space Shuttle Program,” Proceedings AIP Conference, High-Energy Radiation Background in Space Sanibel Island, FL 1987 Lerner R. G. Am. Inst. Physics New York 1989 289
- Hamilton, S. C. Lilley B. “Elemental Volume Dose Program (EVDP),” Rockwell International Document No. SD 76-SA-0184-1 Rockwell International Downey, CA 1976
- Billings, M. P. Yucker W. R. “Summary Final Report: The Computerized Anatomical Man (CAM) Model,” McDonnell Douglas Astronautics Report MDC G4655 McDonnell Douglas Astronautics Huntington Beach, CA 1973
- Atwell, W. Weyland M. D. Hardy A. C. “Radiation Exposure and Risk Assessment for Critical Female Body Organs,” SAE Tech Paper Ser 911352, Proceedings 21st International Conference on Environmental Systems San Francisco, CA July 15 18 1991
- AutoCAD® Release 11 Reference Manual Autodesk, Inc. Publication AC11RM August 7 1990
- Hassitt, A. McIlwain C. E. “Computer Programs for the Computation of B and L (May 1966),” Data Users' Note NSSDC 67-27 National Space Science Data Center, NASA/Goddard Space Flight Center Greenbelt, MD May 1967
- McIlwain, C. E. “Coordinates for Mapping the Distribution of Magnetically Trapped Particles,” J. Geophys, Res. 66 1961 3681
- Sawyer, D. M. Vette J. I. “AP-8 Trapped Proton Environment for Solar Maximum and Solar Minimum,” NSSDC/WDC-A-R&S-76-06 National Space Science Data Center, NASA/ Goddard Space Flight Center Greenbelt, MD June 1976
- Teague, M. J. Vette J. I. “A Model of the Trapped Electron Population for Solar Minimum,” NSSDC 74-03 National Space Science Data Center, NASA/ Goddard Space Flight Center Greenbelt, MD April 1974
- ICRP, International Commission on Radiological Protection Publication 26 Ann. of ICRP 1 Pergamon Press Oxford, England 1977
- Seltzer, S. “SHIELDOSE: A Computer Code for Space-Shielding Radiation Dose Calculations,” NBS Technical Note 1116 U.S. Department of Commerce, National Bureau of Standards 1980
- Adams, J. H., Jr. “Cosmic Ray Effects on Microelectronics, Part IV,” NRL Memorandum Report 5901 Naval Research Laboratory Washington, DC December 31 1987
- Wilson, J. W. Townsend L. W. Nealy J. E. Chun S. Y. Hong B. S. Buck W. W. Lamkin S. L. Ganapol B. D. Khan F. Cucinotta F. A. “BRYNTRN: A Baryon Transport Computer Code, Computation Procedures and Data Base,” NASA Technical Memorandum 4037 National Aeronautics and Space Administration Washington, DC June 1988
- Curtis, S. B. Atwell W. Beever E. R. Hardy A. C. “Radiation Environments and Absorbed Dose Estimations on Manned Space Missions,” Adv. Space Res. 6 1986 269
- Lindenmoyer, A. Habermeyer J. “An Automated, Integrated Approach to Space Station Structural Modeling,” Proceedings 30th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference April 3 5 1989 1591
- Roukis, S. L. Habermeyer J. A. “Space Station Freedom Thermal Modeling Using the IDEAS 2 /TRASYS Interface,” Proceedings 20th International Conference on Environmental Systems Williamsburg, VA July 9 12 1990
- Appleby, M. H. Golightly M. J. Hardy A. C. “Improved Radiation Environment Evaluation Technique: Application to the Redesigned Space Station,” Proceedings of the American Nuclear Society Topical Meeting on New Horizons in Radiation Protection and Shielding Pasco, WA April 26 May 1 1992 188
- Appleby, M. H. Griffin B. N. Tanner, E. R. II Pogue W. R. Golightly M. J. “Computer Aided Radiation Analysis for Manned Spacecraft,” Proceedings 22nd International Conference on Environmental Systems Seattle, WA July 13 16 1992
- Watts, J. W. Parnell T. A. Heckman H. H. “Approximate Angular Distribution and Spectra for Geomagnetically Trapped Protons in Low Earth Orbit,” Proceedings AIP Conference 186, High Energy Radiation Background in Space Sanibel Island, FL Rester, A. C. Jr. Trombka J. J. Am. Instit. Physics New York 1987
- Armstrong, T. W. Colborn B. L. Watts J. W. “Characteristics of Trapped Proton Anisotropy at Space Station Freedom Altitudes,” Science Applications International Corporation Contractor Report SAIC-90/1474 1990
- Advanced Modeling Extension™ Release 2 Reference Manual Autodesk, Inc. Publication AC11AME2-02 January 21 1992
- AutoLISP® Release 11 Programmer's Reference Autodesk, Inc. Publication AC11ALR-2 September 6 1991