ANALYTICAL, NUMERICAL AND EXPERIMENTAL INVESTIGATION OF THE DYNAMIC BEHAVIOR OF A PROTOTYPE FOR A STOCKBRIDGE DAMPER
Résumé
Stockbridge damper is a dynamic absorber attached to transmission line conductors in order to suppress their amplitudes of vibration induced by the wind. In order to understand the complex dynamic behavior of a typical Stockbridge damper and to further develop an optimized shape and material to increase the effectiveness of the absorber, a series of numerical and experimental simulations must be done. In the current work, a cantilever beam carried at the free end a tip mass slender in the axial direction was manufactured, experimented and simulated. Such cantilever beam prototype resembles a typical Stockbridge damper though the geometrical complexity of the wire cable has not been considered in this preliminary investigation. The governing equations for the dynamic behavior of the prototype, under some set of simplifying assumptions, are set forth and analytically solved. Numerical simulations using the commercial finite-element software ANSYS are also performed with the full three-dimensional prototype model, relaxing some simplifying hypotheses adopted in the analytical treatment. The analytical and numerical results are finally compared with measurements obtained during laboratory tests performed with the prototype.
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