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  • 1
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    Space shuttle pogo studies (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Topics covered include: (1) pogo suppression for main propulsion subsystem operation; (2) application of quarter-scale low pressure oxidizer turbopump transfer functions; (3) pogo stability during orbital maneuvering subsystem operation; and (4) errors in frequency response measurements.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-CR-151596 , ATR-78(7474)-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    A numerically efficient finite element hydroelastic analysis. Volume 2: Implementation in NASTRAN, part 2 (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: For abstract, see N76-13529.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-132684-VOL-2-PT-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A numerically efficient finite element hydroelastic analysis. Volume 2: Implementation in NASTRAN, part 1 (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Details are presented of the implementation of the new formulation into NASTRAN including descriptions of the DMAP statements required for conversion of the program and details pertaining to problem definition and bulk data considerations. Details of the current 1/8-scale space shuttle external tank mathematical model, numerical results and analysis/test comparisons are also presented. The appendices include a description and listing of a FORTRAN program used to develop harmonic transformation bulk data (multipoint constraint statements) and sample bulk data information for a number of hydroelastic problems.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-132684-VOL-2-PT-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A numerically efficient finite element hydroelastic analysis. Volume 1: Theory and results (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Symmetric finite element matrix formulations for compressible and incompressible hydroelasticity are developed on the basis of Toupin's complementary formulation of classical mechanics. Results of implementation of the new technique in the NASTRAN structural analysis program are presented which demonstrate accuracy and efficiency.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-2662
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    A numerically efficient finite element hydroelastic analysis (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A finite element hydroelastic analysis formulation is developed on the basis of Toupin's complementary variational principle. Emphasis is placed on the special case of an incompressible fluid model which is applicable to propellant tank hydroelastic analysis. A concise fluid inertia representation results from the assumption of incompressibility and the hydroelastic equations reduce to a simplified form associated with the structure alone. The efficiency of the incompressible hydroelastic formulation in unhanced for both fluid and structure by introduction of harmonic reduction as an alternative to Guyan reduction. The theoretical developments are implemented in the NASTRAN Program and the technique is verified and demonstrated as an efficient and accurate approach with a series of illustrative problems including the 1/8 scale space shuttle external tank.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Ames Res. Center NASTRAN: User's Experiences; p 177-206
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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