Date of Award
Doctor of Philosophy
Kenneth G. McConnell
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.
Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/
Elias Bitencourt Teodoro
Teodoro, Elias Bitencourt, "Dynamics of a power line when supported by a compliant energy absorber " (1994). Retrospective Theses and Dissertations. 10514.