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  • Other Sources  (10)
  • 1980-1984  (10)
  • 1
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    The Tangshan Earthquake of 1976 (1982)
    Seismological Press, 459 pp.
    In:  Beijing, Seismological Press, 459 pp., vol. 1, no. 1, pp. 65-66, (ISBN 0-596-00610-1)
    Details
    Publication Date: 1982
    Keywords: China ; Earthquake
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Collection of Data on Chinese Historical Earthquakes (Zhong-guo di-zhen li-shi zi-liao hui-bian) vol. 1 (1983)
    Academic Publ. House
    In:  Beijing, Academic Publ. House, vol. 4, no. 1, pp. 1-40, (ISBN 0-06-057199-3)
    Details
    Publication Date: 1983
    Keywords: Earthquake catalog ; China ; Earthquake
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Short-term and intermediate precursors to continental earthquakes in China (1984)
    Seismological Press
    In:  Bull., Polar Proj. OP-O3A4, A Collection of Papers of the International Symposium on Continental Seismicity (ISCSEP), Beijing, Seismological Press, vol. 48, no. 4, pp. 440-461, (ISBN 0080419208)
    Details
    Publication Date: 1984
    Keywords: Earthquake ; Earthquake precursor: prediction research
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Collection of Data on Chinese Historical Earthquakes (Zhong-guo di-zhen li-shi zi-liao hui-bian) vol. 5 (1983)
    Academic Publ. House
    In:  Beijing, Academic Publ. House, vol. 4, no. 1, pp. 1-40, (ISBN 0-06-057199-3)
    Details
    Publication Date: 1983
    Keywords: Earthquake catalog ; China ; Earthquake
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Periodicities in the occurrence of aurora as indicators of solar variability (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A compilation of records of the aurora observed in China from the Time of the Legends (2000 - 3000 B.C.) to the mid-18th century has been used to infer the frequencies and strengths of solar activity prior to modern times. A merging of this analysis with auroral and solar activity patterns during the last 200 years provides basically continuous information about solar activity during the last 2000 years. The results show periodicities in solar activity that contain average components with a long period (approx. 412 years), three middle periods (approx. 38 years, approx. 77 years, and approx. 130 years), and the well known short period (approx. 11 years).
    Keywords: SOLAR PHYSICS
    Type: JPL Solar Wind Five; p 349-352
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Response of nonlinear panels to random loads (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Lightweight aircraft structures exposed to a high intensity noise environment can fatigue prematurely if adequate consideration is not given to the problem. Design methods and design criteria for sonic fatigue prevention were developed based on analytical and experimental techniques. Most of the analytical work was based upon small deflection or linear structural theory which did not agree with the experimental results. A large deflection geometrical nonlinearity was incorporated into the analysis methods for determining the structural response to high intensity noise. The Karman-Herrmann large deflection equations with a single mode Galerkin approximation, and the method of equivalent linearization were used to predict mean square amplitude, mean square stresses, and nonlinear frequency at various acoustic loadings for rectangular panels. Both simply supported and clamped support conditions with immovable or movable inplane edges are considered. Comparisons with experimental results are presented.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Research Center Res. in Nonlinear Struct. and Solid Mech.; p 141-163
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    A finite element method for nonlinear forced vibrations of rectangular plates (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The finite element method has been extended to determine the response of large amplitude forced vibrations of thin plates. A harmonic force matrix of a rectangular element under uniform harmonic excitation is developed for nonlinear forced vibration analysis. Inplane deformation and inertia are both considered in the formulation. Results obtained are compared with simple elliptic response, perturbation and other approximation solutions.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 84-0919
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Large deflection, large amplitude vibrations and random response of symmetrically laminated rectangular plates (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An analytical method is presented for determining large-deflection static bending, large-amplitude free and forced vibrations, and large-amplitude random response of a clamped, symmetrically laminated, rectangular, thin plate subjected to a uniformly distributed transverse loading. Both movable and immovable inplane boundary conditions are considered. Numerical results for bending deflections and strains, frequency ratios, mean-square center deflections and mean-square maximum strains are presented showing the parametric effects of plate length-to-width ratio, orientation of layers, and intensities of applied force for both the linear and nonlinear cases. The analytical results for large-deflection random response are verified through comparison with experimental data.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 84-0909
    Format: text
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  • 9
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    A finite element method for nonlinear forced vibrations of beams (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Techniques for defining a finite element model (FEM) for analysis of nonlinear vibrations in beam structures subjected to harmonic excitation are presented. The resulting model covers longitudinal deformation and inertial effects. The nonlinear oscillations of a beam element under forced excitation are modeled by a harmonic force matrix based on first order approximations of the Jacobian elliptic forcing function. Harmonic force and nonlinear stiffness matrices are derived and the nonlinear forced responses of beams are calculated under various boundary conditions. The results of FEM computations for simply-supported and clamped beams show that midplane stretching caused by large deflections increases the nonlinearity. Axially-restrained beams experience only hardening nonlinearity, while axially-free beams have reduced nonlinearity in deformation and inertia and an increase in linearity due to large deflection.
    Keywords: STRUCTURAL MECHANICS
    Type: International Conference on Recent Advances in Structural Dynamics; Apr 09, 1984 - Apr 13, 1984; Southampton
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Component mode synthesis and large deflection vibrations of complex structures (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The accuracy of the NASTRAN modal synthesis analysis was assessed by comparing it with full structure NASTRAN and nine other modal synthesis results using a nine-bay truss. A NASTRAN component mode transient response analysis was also performed on the free-free truss structure. A finite element method was developed for nonlinear vibration of beam structures subjected to harmonic excitation. Longitudinal deformation and inertia are both included in the formula. Tables show the finite element free vibration results with and without considering the effects of longitudinal deformation and inertia as well as the frequency ratios for a simply supported and a clamped beam subjected to a uniform harmonic force.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-173338 , NAS 1.26:173338
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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