Vortex-induced vibrations have a considerable effect on overhead power transmission lines, often leading to fatigue-failure. While nonlinear models exist for power lines, vibration dampers, and vortex-induced vibrations, no work combines the nonlinearities stemming from the cable, vibration damper, and fluid forces in a single model. In previous works, the vortex-induced wind forces were commonly represented by a single excitation term or determined from experimental data. However, vortex-induced vibrations are significantly nonlinear and have been the subject of numerous studies on their own. As power transmission lines are a major component of modern infrastructure, a thorough understanding of the nonlinear dynamic interactions of conductors, dampers, and wind forces is crucial. This paper examines a conductor with attached Stockbridge dampers under vortex-induced vibration. Sources of nonlinearity in this system include mid-plane stretching of the conductor, equivalent cubic stiffness of the Stockbridge damper, and fluctuating lift force modeled as a Van der Pol oscillator. The equations of motion for the resulting system are discretized using Galerkin's method and solved using the numerical continuation method. Through parametric analysis, the effects of factors such as damper position and mass ratio on system response are determined. Insight is gained on the combined nonlinear system and a strong foundation is formed for ongoing study.


Nonlinear Modeling and Analysis of Power Lines With Stockbridge Dampers Under Vortex-Induced Vibrations

Division / Sponsors: 
Dynamic Systems & Control (DSCD)

Paper Proceedings: https://asmedigitalcollection.asme.org/DSCC/DSCC2020/volume/84270

DSCC2020 - Virtual Conference

Supporting the need among researchers worldwide for additional online and multimedia content, ASME now offers the ASME Conference Video Collection. This platform will collect and provide long-term access to conference presentation videos, encompassing all technology areas within ASME's technical conference and events program. About 30,000-40,000 engineers across all mechanical engineering and related disciplines participate in ASME conferences each year. This includes authors of approximately 6,000 to 8,000 technical papers published by ASME, the majority of whom also submit video presentations for our virtual conferences. The video collection will be available as an add-on to existing product packages or as a separate subscription.