Linear instability mechanisms for coupled translational galloping
نویسندگان
چکیده
منابع مشابه
Instability Trends of Inertially Coupled Galloping, Part Ii: Periodic Vibrations
The non-resonant dynamic galloping of an iced, electrical transmission line is studied. Conditions and trends for the initiation of galloping have been given previously. Boundaries are presented here at which a periodic plunge or torsional motion loses stability and bifurcates into a quasi-periodic (mixed-mode) motion. Specific attention is given to the overall effects of an iced line’s eccentr...
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Aeroelastic effects are relatively common in the design of modern civil constructions such as office blocks, airport terminal buildings, and factories. Typical flexible structures exposed to the action of wind are shading devices, normally slats or louvers. A typical cross-section for such elements is a Z-shaped profile, made out of a central web and two-side wings. Galloping instabilities are ...
متن کاملInstability Trends of Inertially Coupled Galloping, Part I: Initiation
The objective of this paper is to investigate the trends of the dynamic behavior of a single iced conductor. Attention is focused not only on the initiation of galloping but also on boundaries where a periodic plunge or torsional motion emerge. Trends with respect to the iced conductor’s eccentricity and its inertia to mass ratio are particularly stressed. They are shown to be complicated becau...
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A computationally efficient, finite element idealization is presented to analyse galloping, which is characterized by large amplitude vibrations of iced, multi-span, electrical transmission lines. A three-node, isoparametric cable element having three translational and a torsional degree-of-freedom at each node is developed to model a conductor. Support insulator strings and remote conductor sp...
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