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  • 1
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    Shifting natural frequencies of plates through preforming (1995)
    Wiley
    Details
    Publication Date: 1995-03-01
    Description: Through an energy formulation and the use of a large deflection theory, it is shown that if a thin plate has a slight initial preform, and if its edges are constrained against in–plane displacements, then all of the natural frequencies of the plate will be shifted upward. For a uniform thin plate, the amount of frequency shift depends on the type of boundary conditions and the ratio of the amplitude of preform to the thickness of the plate. Examples of square and rectangular plates preformed in the shape of their first mode shapes are presented. The method holds the promise of shifting or essentially removing a troublesome vibration mode. Copyright © 1995 John Wiley & Sons, Ltd
    Print ISSN: 0098-8847
    Electronic ISSN: 1096-9845
    Topics: Architecture, Civil Engineering, Surveying
    Published by Wiley
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    PAPER CURRENT
  • 2
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    Thermal analysis of an orthotropic engineering body (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This work is an effort in determining the temperature distribution of an orthotropic engineering body. First the governing partial differential equation is derived, then, a finite element procedure using variational approach is developed for the solution of the governing equation. Finally, a computer program provides a set of satisfactory results.
    Keywords: STRUCTURAL MECHANICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Thermal-stress analysis for a wood composite blade (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A thermal-stress analysis of a wind turbine blade made of wood composite material is reported. First, the governing partial differential equation on heat conduction is derived, then, a finite element procedure using variational approach is developed for the solution of the governing equation. Thus, the temperature distribution throughout the blade is determined. Next, based on the temperature distribution, a finite element procedure using potential energy approach is applied to determine the thermal-stress distribution. A set of results is obtained through the use of a computer, which is considered to be satisfactory. All computer programs are contained in the report.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-174794 , DOE/NASA/0373-1 , NAS 1.26:174794
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Thermal-stress analysis for wood composite blade (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The thermal-stress induced by solar insolation on a wood composite blade of a Mod-OA wind turbine was investigated. The temperature distribution throughout the blade (a heat conduction problem) was analyzed and the thermal-stress distribution of the blades caused by the temperature distribution (a thermal-stress analysis problem) was then determined. The computer programs used for both problems are included along with output examples.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-173830 , NAS 1.26:173830
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Thermal stress analysis for a wood composite blade (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Heat conduction throughout the blade and the distribution of thermal stresses caused by the temperature distribution were determined for a laminated wood wind turbine blade in both the horizontal and vertical positions. Results show that blade cracking is not due to thermal stresses induced by insulation. A method and practical example of thermal stress analysis for an engineering body of orthotropic materials is presented.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-173394 , NAS 1.26:173394
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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