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    Finite element modeling of electromagnetic fields and waves using NASTRAN (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The various formulations of Maxwell's equations are reviewed with emphasis on those formulations which most readily form analogies with Navier's equations. Analogies involving scalar and vector potentials and electric and magnetic field components are presented. Formulations allowing for media with dielectric and conducting properties are emphasized. It is demonstrated that many problems in electromagnetism can be solved using the NASTRAN finite element code. Several fundamental problems involving time harmonic solutions of Maxwell's equations with known analytic solutions are solved using NASTRAN to demonstrate convergence and mesh requirements. Mesh requirements are studied as a function of frequency, conductivity, and dielectric properties. Applications in both low frequency and high frequency are highlighted. The low frequency problems demonstrate the ability to solve problems involving media inhomogeneity and unbounded domains. The high frequency applications demonstrate the ability to handle problems with large boundary to wavelength ratios.
    Keywords: COMMUNICATIONS AND RADAR
    Type: COSMIC, 17th NASTRAN (R) Users' Colloquium; p 214-246
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Response of composite plates subjected to acoustic loading (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The objectives of the project were to investigate numerical methodology for the determination of narrowband response in the geometrically nonlinear regime, to determine response characteristics for geometrically nonlinear plates subjected to random loading and to compare the predictions with experiments to be performed at NASA-Langley. The first two objectives were met. The response of composite plates subjected to both narrowband and broadband excitation were studied and the results are presented and discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-184618 , NAS 1.26:184618
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Time domain simulation of the response of geometrically nonlinear panels subjected to random loading (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The response of composite panels subjected to random pressure loads large enough to cause geometrically nonlinear responses is studied. A time domain simulation is employed to solve the equations of motion. An adaptive time stepping algorithm is employed to minimize intermittent transients. A modified algorithm for the prediction of response spectral density is presented which predicts smooth spectral peaks for discrete time histories. Results are presented for a number of input pressure levels and damping coefficients. Response distributions are calculated and compared with the analytical solution of the Fokker-Planck equations. RMS response is reported as a function of input pressure level and damping coefficient. Spectral densities are calculated for a number of examples.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 88-2236 , Structures, Structural Dynamics and Materials Conference; Apr 18, 1988 - Apr 20, 1988; Williamsburg, VA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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