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  • 1
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    Initial experience with distributing structural calculations among computers operating in parallel (1984)
    In:  CASI
    Details
    Publication Date: 2005-03-28
    Description: An existing program is currently being adapted to perform finite element analysis by distributing substructures over a network of four Apple IIe microcomputers connected to a shared disk. In this network, one microcomputer controls the entire process while the others perform the analysis on each substructure in parallel. This substructure analysis is used in an iterative, fully stressed, structural resizing procedure. This procedure allows experimentatation with resizing in which all analyses are not completed during a single iteration. This research gives some insight on how to configure multidiscriplinary analysis and optimization procedures for decomposable engineering systems using either high performance engineering workstations or a parallel processor supercomputer. In addition, the operational experience gained facilitates the implementation of analysis programs on these new computers when they become available in an engineering environment.
    Keywords: STRUCTURAL MECHANICS
    Type: Res. in Struct. and Dyn., 1984; p 45-54
    Format: text
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  • 2
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    The impact of fourth generation computers on NASTRAN (1975)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The impact of 'fourth generation' computers (STAR 100 or ILLIAC 4) on NASTRAN is considered. The desired characteristics of large programs designed for execution on 4G machines are described.
    Keywords: STRUCTURAL MECHANICS
    Type: NASTRAN: Users' Experiences; p 431-447
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    An isoparametric quadrilateral membrane element for NASTRAN (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The geometric and kinematic properties of the element are described, along with development of the matrices and vectors which characterize the element. The necessity for considering small deviations from element planeness is discussed, and the approach taken to account for these deviations is described. The improved accuracy over the existing quadrilateral membrane is indicated by a sample calculation for which an analytical solution is available from beam theory. For the same finite element idealization, the errors in maximum displacement and stress were significantly reduced.
    Keywords: STRUCTURAL MECHANICS
    Type: NASTRAN: Users' Experiences e; p 315-336
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Software for transferring NASTRAN datablocks between dissimilar computers (1977)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: Efforts to freely exchange all types of NASTRAN datablocks between the internalized forms in any of three makes of NASTRAN-class computers and that of any other such make are described. The medium used is magnetic tape formatted in BCD (Binary Coded Decimal) character and numerical fields. The method used involves a FORTRAN-coded post-processor and a pre-processor, mostly portable but with a small assembly-coded component peculiar to each make of machine. Snags in a method reported in an earlier NASTRAN colloquium have been overcome and functional requirements upgraded as well.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, Washington 6th NASTRAN (R) Users' Colloq.; p 357-368
    Format: text
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  • 5
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    The NASTRAN Error Correction Information System (ECIS) (1975)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A data management procedure, called Error Correction Information System (ECIS), is described. The purpose of this system is to implement the rapid transmittal of error information between the NASTRAN Systems Management Office (NSMO) and the NASTRAN user community. The features of ECIS and its operational status are summarized. The mode of operation for ECIS is compared to the previous error correction procedures. It is shown how the user community can have access to error information much more rapidly when using ECIS. Flow charts and time tables characterize the convenience and time saving features of ECIS.
    Keywords: STRUCTURAL MECHANICS
    Type: NASTRAN: Users' Experiences; p 493-509
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  • 6
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    NASTRAN nonlinear vibration analysis of beam and frame structures (1975)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A capability for the nonlinear vibration analysis of beam and frame structures suitable for use with NASTRAN level 15.5 is described. The nonlinearity considered is due to the presence of axial loads induced by longitudinal end restraints and lateral displacements that are large compared to the beam height. A brief discussion is included of the mathematical analysis and the geometrical stiffness matrix for a prismatic beam (BAR) element. Also included are a brief discussion of the equivalent linearization iterative process used to determine the nonlinear frequency, the required modifications to subroutines DBAR and XMPLBD of the NASTRAN code, and the appropriate vibration capability, four example problems are presented. Comparisons with existing experimental and analytical results show that excellent accuracy is achieved with NASTRAN in all cases.
    Keywords: STRUCTURAL MECHANICS
    Type: NASTRAN: Users' Experiences; p 259-284
    Format: application/pdf
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  • 7
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    Maintenance of NASTRAN (R) as a state-of-the-art computer program (1980)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: The maintenance requirements for a large, general purpose, finite element computer program are presented. The program is maintained as state-of-the-art on three computer systems (IBM, CDC, and UNIVAC) with respect to both finite element and computer technology. There are four primary areas involved in the maintenance effort: (1) error correction; (2) incorporation of advances in technology; (3) documentation; and (4) new level generation. The complexity of the maintenance effort is compounded by the sizes of the program (400,000 lines of code) and the documentation (7000 pages divided into seven manuals).
    Keywords: STRUCTURAL MECHANICS
    Type: AGARD The Use of Computers as a Design Tool; 12 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Application of the TRPLT1 element to large amplitude free vibrations of plates (1977)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: A finite element formulation is developed for analyzing large amplitude free flexural vibrations of thin plates in NASTRAN. Stress distributions in the plate, in addition to deflection shapes and nonlinear frequencies are determined. Linearized equations of motion governing large amplitude oscillations of plates and a linearized geometrical stiffness matrix are presented. The solution procedure and convergence characteristics are discussed. The quasi-linear geometrical stiffness matrix for an eighteen degree-of-freedom higher order triangular plate element is evaluated by using a seven-point numerical integration. Nonlinear frequencies for square, rectangular, rhombic, and isosceles triangular plates, with edges simply supported or clamped, are compared with earlier solutions. The present formulation is found to give results entirely adequate for engineering purposes.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, Washington 6th NASTRAN (R) Users' Colloq.; p 275-298
    Format: text
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  • 9
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    A condensed form of NASTRAN (1977)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: The Interactive Graphics Finite Element System, IGFES, is described along with its supporting analysis software, graphics terminal support package and hardware configurations. IGFES provides an interactive design tool for structural engineers via pre- and postprocessing of finite element data. The system currently runs on an IBM 360/44 OS-MFT system or a PDP 11/40 DOS/BATCH system. Graphics devices are supported using an inhouse developed, device independent terminal support package. Support is available for the Calcomp 563 drum plotter, Tektronix 4002A storage display terminal and the Lundy Electronics 20 inch standalone refresh display system. IGFES and its associated systems are written in FORTRAN IV.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, Washington 6th NASTRAN (R) Users' Colloq.; p 299-325
    Format: text
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  • 10
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    Real eigenvalue analysis in NASTRAN by the tridiagonal reduction (FEER) method (1976)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Implementation of the tridiagonal reduction method for real eigenvalue extraction in structural vibration and buckling problems is described. The basic concepts underlying the method are summarized and special features, such as the computation of error bounds and default modes of operation are discussed. In addition, the new user information and error messages and optional diagnostic output relating to the tridiagonal reduction method are presented. Some numerical results and initial experiences relating to usage in the NASTRAN environment are provided, including comparisons with other existing NASTRAN eigenvalue methods.
    Keywords: STRUCTURAL MECHANICS
    Type: NASTRAN" User's Experiences; p 127-148
    Format: application/pdf
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