Degree Type

Dissertation

Date of Award

1994

Degree Name

Doctor of Philosophy

Department

Aerospace Engineering

First Advisor

Kenneth G. McConnell

Abstract

Power lines are subjected to complex aerodynamic forces that may cause galloping. The galloping phenomenon is highly complex because of the nonlinear, geometric-dependent, time-varying aerodynamic loads and the resulting amplitudes of vibration, which may cause interactions between various vibration modes and also between adjacent spans and their support hardware. It is generally agreed that cable galloping is the result of the aerodynamic instability of ice-coated cables. This instability can be defined in terms of measurable aerodynamic properties of the airfoils and the characteristics of the mechanical system. Galloping oscillations can cause interphase clashing, which may lead to flashovers that result in severe disruptions in the electrical power supply. The galloping motion can cause impact damage to insulator strings, support hardware, and tower components. The purpose of this work is to develop mathematical models that provide guidance in designing an energy absorber that will reduce both the magnitude of galloping and the peak impact loads that act on power line structures.

DOI

https://doi.org/10.31274/rtd-180813-9758

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Elias Bitencourt Teodoro

Language

en

Proquest ID

AAI9503599

File Format

application/pdf

File Size

138 pages

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