On the dynamic modeling and analysis of an asymmetric Stockbridge damper

Abstract eng:
Stockbridge dampers are the most common devices used to reduce Aeolian vibrations of overhead transmission lines. The effectiveness of dampers is quantified by the number of resonant frequencies they possess. There are two types of Stockbridge dampers: symmetric and asymmetric. Symmetric Stockbridge dampers have identical counterweights and cable lengths at each end and are expected to possess up to two resonant frequencies. Asymmetric Stockbridge dampers have different counterweights and cable length at each end and are characterized to possess up to four resonant frequencies. The number of resonant frequencies that a Stockbridge damper possesses is mostly dependent on its material and geometric properties. This paper presents a full-scale finite element model of an asymmetric Stockbridge damper utilizing SolidWorks Simulation. Free vibration analysis of the constructed finite element model is conducted to determine the natural frequencies and subsequent mode shapes. The results from the simulated finite element model are validated using the results from the analytical model. Parametric studies are conducted to examine the effect of the material and geometry properties of the counterweight and a new design is proposed. This study opens a horizon of opportunities for future research in optimizing the performance of Stockbridge dampers. The findings enable design engineers to predict the performance of Stockbridge dampers.

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