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  • 1
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    The NASA structural analysis general purpose digital computer program (1970)
    In:  CASI
    Details
    Publication Date: 2006-04-25
    Description: NASA computer program for dynamic structural analysis in stress and thermal deformation problems
    Keywords: STRUCTURAL MECHANICS
    Type: NIFICANT ACCOMPLISHMENTS IN SCI. AND TECHNOL. AT GODDARD SPACE FLIGHT CENTER 1970; P 221-224
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Test versus analysis: A discussion of methods (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Some techniques for comparing structural vibration data determined from test and analysis are discussed. Orthogonality is a general category of one group, correlation is a second, synthesis is a third and matrix improvement is a fourth. Advantages and short-comings of the methods are explored with suggestions as to how they can complement one another. The purpose for comparing vibration data from test and analysis for a given structure is to find out whether each is representing the dynamic properties of the structure in the same way. Specifically, whether: mode shapes are alike; the frequencies of the modes are alike; modes appear in the same frequency sequence; and if they are not alike, how to judge which to believe.
    Keywords: STRUCTURAL MECHANICS
    Type: COSMIC 14th NASTRAN (R) Users' Colloquium; p 173-186
    Format: application/pdf
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  • 3
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    Experience with Free Bodies (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Some of the problems that confront an analyst in free body modeling, to satisfy rigid body conditions are discussed and with some remedies for these problems are presented. The problems of detecting these culprits at various levels within the analysis are examined. A new method within NASTRAN for checking the model for defects very early in the analysis without requiring the analyst to bear the expense of an eigenvalue analysis before discovering these defects is outlined.
    Keywords: STRUCTURAL MECHANICS
    Type: COSMIC 13th NASTRAN (R) Users' Colloq.; p 378-388
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Seismic Analysis Capability in NASTRAN (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Seismic analysis is a technique which pertains to loading described in terms of boundary accelerations. Earthquake shocks to buildings is the type of excitation which usually comes to mind when one hears the word seismic, but this technique also applied to a broad class of acceleration excitations which are applied at the base of a structure such as vibration shaker testing or shocks to machinery foundations. Four different solution paths are available in NASTRAN for seismic analysis. They are: Direct Seismic Frequency Response, Direct Seismic Transient Response, Modal Seismic Frequency Response, and Modal Seismic Transient Response. This capability, at present, is invoked not as separate rigid formats, but as pre-packaged ALTER packets to existing RIGID Formats 8, 9, 11, and 12. These ALTER packets are included with the delivery of the NASTRAN program and are stored on the computer as a library of callable utilities. The user calls one of these utilities and merges it into the Executive Control Section of the data deck to perform any of the four options are invoked by setting parameter values in the bulk data.
    Keywords: STRUCTURAL MECHANICS
    Type: COSMIC Twelfth NASTRAN (R) Users' Colloq.; p 92-131
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  • 5
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    On the Reduction of Proliferation of Finite Element Programs (1971)
    In:  CASI
    Details
    Publication Date: 2014-09-04
    Description: Reduction of proliferation and maintainability of finite element method computer programs
    Keywords: STRUCTURAL MECHANICS
    Type: NASTRAN: Users Experiences; p 813-825
    Format: text
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  • 6
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    Using NASTRAN to solve symmetric structures with nonsymmetric loads (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A method for computation of reflective dihedral symmetry in symmetrical structures under nonsymmetric loads is described. The method makes it possible to confine the analysis to a half, a quarter, or an octagonal segment. The symmetry of elastic deformation is discussed, and antisymmetrical deformation is distinguished from nonsymmetrical deformation. Modes of deformation considered are axial, bending, membrane, and torsional deformation. Examples of one and two dimensional elements are presented and extended to three dimensional elements. The method of setting up a problem within NASTRAN is discussed. The technique is applied to a thick structure having quarter symmetry which was modeled with polyhedra and subjected to five distinct loads having varying degrees of symmetry.
    Keywords: STRUCTURAL MECHANICS
    Type: 10th NASTRAN User's Colloq.; p 216-232
    Format: text
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  • 7
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    Operating in the age of NASTRAN (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The history of the development of the NASTRAN computer program, a general purpose finite element code for structural analysis, is described. The need for research programs to improve analysis of structures, and the writing of a computer program to give numerical solutions for shell behavior, were the impetus for the program design. The use of finite elements to obtain engineering solutions was introduced. The architecture, solution structure, DMAP language, decomposition technique for banded matrices with active columns, general purpose plotter, engineering data inputs, elastic element routines, programmer manuals, of NASTRAN's system design are described.
    Keywords: STRUCTURAL MECHANICS
    Type: 10th NASTRAN User's Colloq.; p 1-11
    Format: text
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  • 8
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    Bubble vector in automatic merging (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: It is shown that it is within the capability of the DMAP language to build a set of vectors that can grow incrementally to be applied automatically and economically within a DMAP loop that serves to append sub-matrices that are generated within a loop to a core matrix. The method of constructing such vectors is explained.
    Keywords: STRUCTURAL MECHANICS
    Type: COSMIC, 15th NASTRAN (R) Users' Colloquium; p 118-135
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  • 9
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    Technical and social impact of NASTRAN (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Estimates are made as to the direction in which a new generation of general purpose applications programs can be expected to migrate. Predictions are made as to the impacts that space technology is liable to have within the field of structural engineering and on the society in which it interacts.
    Keywords: COMPUTERS
    Type: NASTRAN: Users' Experiences; p 15-27
    Format: application/pdf
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  • 10
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    Design Spectrum Analysis in NASTRAN (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The utility of Design Spectrum Analysis is to give a mode by mode characterization of the behavior of a design under a given loading. The theory of design spectrum is discussed after operations are explained. User instructions are taken up here in three parts: Transient Preface, Maximum Envelope Spectrum, and RMS Average Spectrum followed by a Summary Table. A single DMAP ALTER packet will provide for all parts of the design spectrum operations. The starting point for getting a modal break-down of the response to acceleration loading is the Modal Transient rigid format. After eigenvalue extraction, modal vectors need to be isolated in the full set of physical coordinates (P-sized as opposed to the D-sized vectors in RF 12). After integration for transient response the results are scanned over the solution time interval for the peak values and for the times that they occur. A module called SCAN was written to do this job, that organizes these maxima into a diagonal output matrix. The maximum amplifier in each mode is applied to the eigenvector of each mode which then reveals the maximum displacements, stresses, forces and boundary reactions that the structure will experience for a load history, mode by mode. The standard NASTRAN output processors have been modified for this task. It is required that modes be normalized to mass.
    Keywords: STRUCTURAL MECHANICS
    Type: COSMIC Twelfth NASTRAN (R) Users' Colloq.; p 78-91
    Format: application/pdf
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