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  • Other Sources  (2)
  • ENGINEERING (GENERAL)  (2)
  • 2020-2024
  • 1990-1994  (2)
  • 1965-1969
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  • 2020-2024
  • 1990-1994  (2)
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  • 1
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    A PC-based collapse factor analysis for high pressure cryogenic systems (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A collapse factor simulation computer program, suitable for use on personal computers, for supercritical cryogen system pressurization is examined. The available literature is previewed, individual component models are developed, and the overall simulation program logic is examined. Extensive use is made of existing thermodynamic and transport property evaluation packages. Heat transfer is estimated using natural convection correlations, and transient wall heat conduction is considered. Examples of the simulation are demonstrated for two facilities. Partial validation is achieved by comparing the simulation output with data from an existing test facility. Preliminary results indicate that the collapse factors will seldom exceed 1.15 during supercritical operation of high-pressure cryogenic systems. Recommendations for improvements in the component models and the simulation are made.
    Keywords: ENGINEERING (GENERAL)
    Type: AIAA PAPER 92-3683
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The importance of cost considerations in the systems engineering process (1993)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: This paper examines the question of cost, from the birth of a program to its conclusion, particularly from the point of view of large multi-center programs, and suggests how to avoid some of the traps and pitfalls. Emphasis is given to cost in the systems engineering process, but there is an inevitable overlap with program management. (These terms, systems engineering and program management, have never been clearly defined.) In these days of vast Federal budget deficits and increasing overseas competition, it is imperative that we get more for each research and development dollar. This is the only way we will retain our leadership in high technology and, in the long run, our way of life.
    Keywords: ENGINEERING (GENERAL)
    Type: Readings in Systems Engineering; p 115-125
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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