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  • 1
    facet.materialart.
    Unknown
    Response of panels to oscillating and to moving shock waves. (1967)
    In:  Other Sources
    Details
    Publication Date: 2011-08-11
    Description: Panels response to oscillating and to moving shock waves, discussing mode excitation, magnification factor, Bessel function, etc
    Keywords: STRUCTURAL MECHANICS
    Type: ACOUSTICAL SOCIETY OF AMERICA
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Response of panels to oscillating shock waves (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-30
    Description: Structural response of supported panels to oscillating shock waves
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-77435 , WR-66-17
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Theoretical and experimental response of panels to turbulent boundary layer pressure fluctuations and separated flow. Some preliminary results (1967)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Digital computer program for predicting panel response to turbulent boundary layer fluctuations
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-61555 , WR-67-8
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Mechanical system diagnostics using vibration testing techniques (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The 'Cepstrum' technique of vibration-path identification allows the recovery of the transfer function of a system with little knowledge as to its excitation force, by means of a mathematical manipulation of the system output in conjunction with subtraction of part of the output and suitable signal processing. An experimental program has been conducted to evaluate the usefulness of this technique in the cases of simple, cantilever-beam and free-free plate structures as well as in that of a complex mechanical system. On the basis of the transfer functions thus recovered, it was possible to evaluate the shifts in the resonance frequencies of a structure due to the presence of defects.
    Keywords: STRUCTURAL MECHANICS
    Type: International Congress on Recent Developments in Air and Structure-Borne Sound and Vibration; Mar 06, 1990 - Mar 08, 1990; Auburn, AL; United States
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    NASA TECHNICAL REPORTS
  • 5
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    An improved method to determine vibration damping of materials and structural components (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The present, improved frequency-domain technique for vibration-damping estimation involves the fitting of a 'best curve' for the measured frequency-response data near a resonance by means of a least-squares error criterion. The damping ratio and the undamped natural frequency are then computed using the coefficients of the rational fraction polynomial that had been determined on the basis of the curve-fitting technique. Attention is given to the results of this method's application to damping measurements for graphite-reinforced epoxy composites. The results obtained are superior to those of the 'half-power points' method.
    Keywords: STRUCTURAL MECHANICS
    Type: International Congress on Recent Developments in Air and Structure-Borne Sound and Vibration; Mar 06, 1990 - Mar 08, 1990; Auburn, AL; United States
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    NASA TECHNICAL REPORTS
  • 6
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    Analytical and experimental study of the vibration of bonded beams with a lap joint (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A theoretical model to study the flexural vibration of a bonded lap joint system is described in this paper. First, equations of motion at the joint region are derived using a differential element approach. The transverse displacements of the upper and lower beam are considered to be different. The adhesive is assumed to be linearly viscoelastic and the widely used Kelvin-Voight model is used to represent the viscoelastic behavior of the adhesive. The shear force at the interface between the adhesive and the beam is obtained from the simple bending motion equations of the two beams. The resulting equations of motion are combined with the equations of transverse vibration of the beams in the unjointed regions. These are later solved as a boundary value problem to obtain the eigenvalues and eigenvectors of the system. The model can be used to predict the natural frequencies, modal damping ratios, and mode shapes of the system for free vibration. Good agreement between numerical and experimental results was obtained for a system of graphite epoxy beams lap-jointed by an epoxy adhesive.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME, Transactions, Journal of Vibration and Acoustics (ISSN 0739-3717); 112; 444-451
    Format: text
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