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  • 1
    Electronic Resource
    Electronic Resource
    Detection and simulation of small trasverse cracks in rotating shafts (1994)
    Springer
    Archive of applied mechanics 64 (1994), S. 206-222 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Die Erkennung kleiner, ebener Querrisse in Rotoren ist schwierig. Ein erweitertes Verfahren zur Schwingungs-überwachung wird in Laborsuchen erprobt. Es basiert auf einer winkelgebergesteuerten Aufnahme der Rotorschwingungs-signale und der Differenzbildung mit einem Referenzsignal des ungerissenen Rotors. Ein finites Rißelement wird aus räumlichen Finite-Elemente-Berechnungen entwickelt und zur numerischen Simulation des dynamischen Verhaltens angerissener Rotoren verwandt. Die Simulationsergebnisse werden mit den Meßergebnissen verglichen.
    Notes: Summary The detection of small transverse cracks in rotating shafts is difficult. An advanced vibration monitoring method is proved in laboratory tests. It bases on an angle dependent sampling of the vibrational data and the comparison with a reference signal of the undamaged rotor. A finite crack element is developed from a spatial finite element analysis and is used for numerical simulations of the dynamic behaviour of cracked rotors. The results of the numerical simulations are compared with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806818
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  • 2
    Electronic Resource
    Electronic Resource
    Some types of organic high polymers and permutoids provided with active groups: Their synthesis, optical properties, and reactivityPresented at the International Congress of Pure and Applied Chemistry, September, 1951. (1952)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 8 (1952), S. 191-213 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The synthesis and the properties of permutoids with ionic active groups and the kinetics of the decomposition of diazoacetic ester and of nitrosomethylurea through the ionic active groups are dealt with. A discussion follows of the synthesis of high polymers and permutoids with active groups of the chlorophyll and hemin series obtained by the introduction of the corresponding active groups into high-polymeric compounds, by copolymerization, and by inclusion of the prosthetic group in the polycondensation process. A report is added on the optical properties of the high-molecular compounds provided with active groups and on remarkable differences between low-molecular compounds in a dissolved state and as active groups linked to high polymers. The apparatuses developed for taking absorption and reflection spectra are described. Finally, the catalytic effect of the high polymers provided with active groups of the hemin series is examined.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1952.120080206
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