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  • STRUCTURAL MECHANICS
  • 1980-1984
  • 1975-1979  (20)
  • 1965-1969
  • 1960-1964
  • 1935-1939
  • 1977  (20)
  • 1
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    A 3-D hydroelastic analysis in NASTRAN with general fluid and structure geometry (1977)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: The implementation of a general three dimensional hydroelastic mode analysis capability in NASTRAN is presented. Finite elements with polyhedral shapes define the fluid; existing NASTRAN plate elements define the fluid/structure interface. Efficient solution methods were implemented to allow a separate structural matrix reduction and to allow connection of the fluid mass directly to a small set of grid points or modal coordinates representing the structure. Test case results for the various solution options are presented.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, Washington 6th NASTRAN (R) Users' Colloq.; p 3-23
    Format: text
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  • 2
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    Non-linear analysis of vibrations of irregular plates (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A numerical perturbation method is used to investigate the forced vibrations of irregular plates. Nonlinear terms associated with the midplane stretching are retained in the analysis. The numerical part of the method involves the use of linear, finite element techniques to determine the free oscillation mode shapes and frequencies and to obtain the linear midplane stress resultants caused by the midplane stretching. Representing the solution as an expansion in terms of these linear mode shapes, these modes and the resultants are used to determine the equations governing the time-dependent coefficients of this expansion. These equations are solved by using the method of multiple scales. Specific solutions are given for the main-resonant vibrations of an elliptical plate in the presence of internal resonances. The results indicate that modes other than the driven mode can be drawn into the steady state response. Though the excitation is composed of a single harmonic, the response may not be periodic. Moreover, the particular types of responses that can occur are highly dependent on the mode being excited and are sensitive to small geometrical changes.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Sound and Vibration; 50; Jan. 22
    Format: text
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  • 3
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    Transient excitation and mechanical admittance test techniques for prediction of payload vibration environments (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Transient excitation forces were applied separately to simple beam-and-mass launch vehicle and payload models to develop complex admittance functions for the interface and other appropriate points on the structures. These measured admittances were then analytically combined by a matrix representation to obtain a description of the coupled system dynamic characteristics. Response of the payload model to excitation of the launch vehicle model was predicted and compared with results measured on the combined models. These results are also compared with results of earlier work in which a similar procedure was employed except that steady-state sinusoidal excitation techniques were included. It is found that the method employing transient tests produces results that are better overall than the steady state methods. Furthermore, the transient method requires far less time to implement, and provides far better resolution in the data. However, the data acquisition and handling problem is more complex for this method. It is concluded that the transient test and admittance matrix prediction method can be a valuable tool for development of payload vibration tests.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-2787 , SWRI-02-4202
    Format: application/pdf
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  • 4
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    Response of a beam on an inertial foundation to a traveling load (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The response of a Bernoulli-Euler beam supported by a Winkler-type elastic foundation with inertia and subjected to a moving load is investigated. Steady-state solutions are determined for an undamped and linearly damped beam-foundation system. The effects on the response of load velocity, foundation mass, and damping are studied. For the undamped system, it is well known that the response grows without bound as a certain critical velocity is approached. It is shown that the effect of foundation mass is to reduce the critical velocity and to increase the peak deflection. The increase in peak deflection becomes more pronounced as the critical velocity is approached. As in the case of massless foundation, the deflection wave is observed to be symmetric with respect to the load. When damping is introduced, the deflection wave loses its symmetry, and the peak deflection is reduced. Results for both cases are given in graphical form.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal; 15; Aug. 197
    Format: text
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  • 5
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    Doubly-curved variable-thickness isoparametric heterogeneous finite element (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: This paper describes an element streamlined for the analysis of doubly-curved, variable-thickness structural components and illustrates its effective application to vibration and static problems. The element is isoparametric, doubly-curved, thin-shell and triangular with variable thickness and accounts for anisotropic, inhomogeneous elastic material behavior. The element has six nodes (three corner and three mid-side) with five degrees-of-freedom (DOF) per node - three translations and two rotations. Quadratic isoparametric interpolation polynomials are used to express the element geometry and displacement variables in terms of corresponding nodal variables.
    Keywords: STRUCTURAL MECHANICS
    Format: text
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  • 6
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    Structural model integrity (1977)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: Many of the practical aspects and problems of ensuring the integrity of a structural model are discussed, as well as the steps which have been taken in the NASTRAN system to assure that these checks can be routinely performed. Model integrity as used applies not only to the structural model but also to the loads applied to the model. Emphasis is also placed on the fact that when dealing with substructure analysis, all of the checking procedures discussed should be applied at the lowest level of substructure prior to any coupling.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, Washington 6th NASTRAN (R) Users' Colloq.; p 93-104
    Format: text
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  • 7
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    NORCK: A NASTRAN module to check input data and element geometry (1977)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: NORCK, a direct matrix abstraction module, was written which allows the user the ability to define error limits for finite element geometry and properties within the solution flow, and to find these errors before the more expensive parts of the analysis are run.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, Washington 6th NASTRAN (R) Users' Colloq.; p 65-74
    Format: text
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  • 8
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    NASTRAN: Status, plans, and performance (1977)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: Plans for NASTRAN, a program developed and improved over the past 13 years, were outlined in reference to a new capability of level 17. The target release date is given as December 1977 and domestic release will be through COSMIC. As an example of the improved efficiency of NASTRAN level 16, a table of CPU run time comparisons is shown.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, Washington 6th NASTRAN (R) Users' Colloq.; ix-xviii
    Format: text
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  • 9
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    Addition of rigid elements to NASTRAN (1977)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: Four rigid elements, namely, a rigid rod element (CRIGDR) and three rigid body elements (CRIGD1, GRIGD2 and CRIGD3), have recently been added to NASTRAN and will be available in the next public release of the program. The theoretical formulation, the bulk data information and the programming details pertaining and realistic problems are illustrated by employing them in the solution of two helicopter structural analysis problems.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, Washington 6th NASTRAN (R) Users' Colloq.; p 449-468
    Format: text
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  • 10
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    A direct matrix abstraction procedure for a static solution during a phase 1 substructuring analysis (1977)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: A directed matrix abstraction procedure is described which allows a static solution to be obtained in phase 1 of a three phase NASTRAN substructuring analysis while at the same time storing all information needed to complete the substructuring analysis.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, Washington 6th NASTRAN (R) Users' Colloq.; p 105-117
    Format: text
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