Modeling the Dynamic Characteristics of Slack Wire Cables in STOCKBRIDGE Dampers.
Technische Universität, Darmstadt
[Ph.D. Thesis], (2004)
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|Item Type:||Ph.D. Thesis|
|Title:||Modeling the Dynamic Characteristics of Slack Wire Cables in STOCKBRIDGE Dampers|
Damping due to internal friction in taut wire cables undergoing bending vibrations is negligible in many cases. Slack cables, however, exhibit significant flexural hysteresis resulting from interstrand friction. This type of static hysteresis is utilized in various applications where wire cables are used in damping of mechanical vibrations. Stockbridge dampers in overhead transmission lines are one example where short wire cables are used in damping wind-excited oscillations due to vortex shedding. The present work deals with the analysis of the dynamic behavior of such cables. The local mechanical properties of a wire cable are identified experimentally. In particular, the moment-curvature-relationship is determined experimentally at every location of the wire cable which is subjected to dynamic flexural deformations. A simple device for measuring the local curvatures of short wire cables was constructed specifically for this purpose. As expected, the effective bending stiffness, as well as the hysteretic properties, varies along the length of the cable. The experimental results are presented and the applicability of the local models is discussed. In addition, a mathematical description is given in terms of local MASING elements and the relevant parameters of these elements are identified. The local properties of a cable are used to determine the overall behavior of a short cable undergoing bending vibrations. It is shown that such an approach can be applied succesfully in the design of damping devices such as Stockbridge dampers.
|Place of Publication:||Darmstadt|
|Uncontrolled Keywords:||Masing Jenkin Element, Stockbridge-Dämpfer|
|Classification DDC:||600 Technik, Medizin, angewandte Wissenschaften > 600 Technik|
|Divisions:||Study Areas > Study Area Mechanic|
|Date Deposited:||17 Oct 2008 09:21|
|Last Modified:||07 Dec 2012 11:49|
|Referees:||Ottl, Prof. Dr. Dieter|
|Advisors:||Hagedorn, Prof. Dr. Peter|
|Refereed:||5 December 2003|