The method of analyzing vibrations of air power transmission lines using reduced finite-element models ofpylons and differential model of thin elastic rod system

摘要

Air power transmission lines (PTL) are widely used for electricity delivery. To prevent possible crashes we should analyze dynamic response of air PTL under different external loads. In this paper the method of modeling dynamics of an air PTL is presented. Metal pylons simulated by reduced finite elements models. These models can be obtained using experimental system identification methods, but in this paper we use finite element modeling of pylons at ANSYS. To generate reduced models from full-sized finite element model of pylons the Component Mode Synthesis methods are used. Electric wires are represented by rod system. Nonlinear dynamics of each rod is defined by differential model of thin elastic rod. These rods have boundary conditions in the interface nodes of reduced finite element models of pylons. The equilibrium between reaction forces of rods and nodal displacements of reduced finite-element models of pylons is defined during numerical solution of the nonlinear boundary value problem for the rod system.