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  • STRUCTURAL MECHANICS  (2)
  • 2020-2022
  • 1985-1989  (2)
  • 1
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    A comparison of several methods for the calculation of vibration mode shape derivatives (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Four methods for the calculation of derivatives of vibration mode shapes (eigenvectors) with respect to design parameters are reviewed and compared. These methods (finite difference method, Nelson's method, modal method and a modified modal method) are implemented in a general-purpose commercial finite element program and applied to a cantilever beam and a stiffened cylinder with a cutout. A beam tip mass, a beam root height and specific dimensions of the cylinder model comprise the design variables. Data are presented showing the amount of central processor time used to compute the first four eigenvector derivatives for each example problem; errors and rapidity of convergence of the approximate derivative to the exact derivative are taken into account. Nelson's method proved to be most reliable and efficient.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 86-0873
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Application of mathematical optimization procedures to a structural model of a large finite-element wing (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An optimization system is described that consists of the finite-element analysis program known as Engineering Analysis Language (EAL), the CONMIN optimization program, and a piecewise linear analysis. The optimization analysis system (OPTEAL) is used to minimize the mass of a transport wing subject to stress constraints for two static load conditions. The optimization procedure and the optimization analysis system (OPTEAL) are described and the optiomized results with fully stressed design results compared.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-87597 , L-15930 , NAS 1.15:87597
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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