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  • COMPUTERS  (3)
  • SPACECRAFT PROPULSION AND POWER  (1)
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  • 1
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    Evolutionary use of nuclear electric propulsion (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Evolving new propulsion technologies through a rational and conscious effort to minimize development costs and program risks while maximizing the performance benefits is intuitively practical. A phased approach to the evolution of nuclear electric propulsion from use on planetary probes, to lunar cargo vehicles, and finally to manned Mars missions with a concomitant growth in technology is considered. Technology levels and system component makeup are discussed for nuclear power systems and both ion and magnetoplasmadynamic thrusters. Mission scenarios are described, which include analysis of a probe to Pluto, a lunar cargo mission, Martian split, all-up, and quick-trip mission options. Evolutionary progression of the use of NEP in such missions is discussed.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 90-3821
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    REDUCE 2: A computer program for the symbolic reduction of large block diagrams (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: REDUCE 2 is reported as a FORMAC program which symbolically calculates the transfer function(s) of any linear-block-diagram output variable to any or all input variables. The program requires as input a set of algebraic expressions representing the block diagram, the desired transfer function(s), and a string of variables indicating the desired order of reduction. The solution is presented in the compact form of a set of nested functions (super G's). The program can handle systems as large as 600 equations and is intended as a tool for the analysis of complex control and dynamic systems. A companion FORTRAN program, EVAL 2, which numerically evaluates the solution set to obtain amplitude ratio and phase angle as functions of frequency is also presented.
    Keywords: COMPUTERS
    Type: NASA-TN-D-7621 , E-5860
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Applications of symbolic computing methods to the dynamic analysis of large systems. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An unconventional approach is considered to a computer-aided analysis of the dynamics of large systems. The proposed approach is based on the use of symbolic computing methods that are applied directly to the system equations. Other areas of application of this symbolic method are also pointed out.
    Keywords: COMPUTERS
    Type: World Congress of the International Federation of Automatic Control; Jun 12, 1972 - Jun 17, 1972; Paris; France
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Applications of symbolic computing methods to the dynamic analysis of large systems (1971)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Since the symbolic computing language is very well suited to the operations with algebraic equations, techniques use the transfer function concept as a tool for the analysis of large linear dynamic systems. Techniques were coded in the experimental symbolic computer language FORMAC. The first of these approaches, REDUCE 1, establishes the techniques and a computer program to symbolically reduce arbitrary block diagrams associated with large systems for desired transfer functions. Symbolic closed form solutions are determined in several forms including an expanded form in terms of the driving frequencies and system constants. Programs are also written to numerically evaluate the symbolic solutions. A second computer program, REDUCE 2, is also based on the use of symbolic computing methods and was written to accommodate large engineering systems.
    Keywords: COMPUTERS
    Type: NASA-TM-X-67908 , E-6519 , Jun 12, 1972 - Jun 17, 1972; Congr. of the Intern. Federation of Autom. Control, Paris
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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