Finite Element Modeling of Stockbridge Damper and Vibration Analysis: Equivalent Cable Stiffness

Abstract

Abstract-Aeolian vibrations are the major cause for the failure of conductor cables. Using a Stockbridge damper reduces these vibrations and increases the life span of the conductor cable. Designing an efficient Stockbridge damper that suits the conductor cable requires a robust mathematical model with minimum assumptions. However it is not easy to analytically model the complex geometry of the messenger. Therefore an equivalent stiffness must be determined so that it can be used in the analytical model. This paper examines the bending stiffness of the cable and discusses the effect of this stiffness on the natural frequencies. The obtained equivalent stiffness compensates for the assumption of modeling the messenger as a rod. The results from the free vibration analysis of the analytical model with the equivalent stiffness is validated using the full scale finite element model of the Stockbridge damper.

Characteristics of the asymmetric Stockbridge damper

“…The authors reported that the motion amplitude of vibration is inversely proportional to the natural frequency. Vaja et al [7] developed a mathematical model with minimum assumptions of the Stockbridge damper that suits the conductor cable. The bending stiffness of the cable and the effect of this stiffness on the natural frequencies were examined.…”

Desarrollo de un dispositivo para mitigación de vibraciones para sistemas de catenaria rígida = Development of a vibration mitigation device for rigid catenary systems

“…Para evitar el fenómeno de amplificación de las oscilaciones se vienen colocando amortiguadores de masas sintonizadas en un punto cercano a la grapa de anclaje [135,51].…”