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  • modal interactions  (2)
  • molecularmobility  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Mechanical properties and molecular mobility in oriented polyolefines (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 220-225 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Fibers ; elastic modulus ; correlation time ; molecularmobility ; orientation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract The static modulus of elasticity (E) and the correlation time of rotation (τ c ) of 2,-2,6,6-tetramethylpiperidine-1-oxyl are studied as a function of the temperature (210〈T 〈350°K) for oriented films of isotactic polypropylene and polyethylene of high and low density.E andτ c change both upon heating and polymer orientation; this result indicates that sample properties are influenced by the microstructure of the amorphous phase where probes are localized.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01412710
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    A Bifurcation Analysis of the Dynamics of a Simplified Shell Model (1997)
    Springer
    Nonlinear dynamics 12 (1997), S. 307-317 
    Details
    ISSN: 1573-269X
    Schlagwort(e): Shell dynamics ; modal interactions ; continuation methods ; Donnell equations
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract We study parametrically excited vibrations of a shallow cylindrical panel. The mathematical model is a system of two partial differential equations based on Donnell's shallow shell theory. The original equations are discretised using Galerkin approximations and all calculations are performed through symbolic manipulations. A bifurcation analysis of a system model with two degrees of freedom is accomplished by continuation techniques. The importance of the second degree of freedom as well as some open questions concerning the modelling of shell vibrations are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008241806995
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Bifurcation Analyses in the Parametrically Excited Vibrations of Cylindrical Panels (1998)
    Springer
    Nonlinear dynamics 17 (1998), S. 205-225 
    Details
    ISSN: 1573-269X
    Schlagwort(e): Shell dynamics ; modal interactions ; continuation methods ; Donnell equations
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract We consider parametrically excited vibrations of shallow cylindrical panels. The governing system of two coupled nonlinear partial differential equations is discretized by using the Bubnov–Galerkin method. The computations are simplified significantly by the application of computer algebra, and as a result low dimensional models of shell vibrations are readily obtained. After applying numerical continuation techniques and ideas from dynamical systems theory, complete bifurcation diagrams are constructed. Our principal aim is to investigate the interaction between different modes of shell vibrations under parametric excitation. Results for system models with four of the lowest modes are reported. We essentially investigate periodic solutions, their stability and bifurcations within the range of excitation frequency that corresponds to the parametric resonances at the lowest mode of vibration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008396603655
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