ABSTRACT
Aeolian vibrations of overhead transmission lines are a relevant technical problem, usually solved relaying on the Energy Balance Principle and on knowledge of the mode shapes and frequencies of the line. In this work, a computationally effective procedure, easily generalizable to complex configurations with different types of inline equipment, is presented. The transmission line is modelled through a dynamic substructuring approach: the mechanical impedance, in the sense of a dynamic stiffness matrix, of each structural element (e.g. the cables) is defined via a continuum approach and then assembled to the one of lumped components (e.g. the dampers) to obtain the impedance of the overall system. Natural frequencies and mode shapes are then determined through a forced vibration method, which allows to easily handle non-proportional damping, typical for the problem at study. The procedure herein proposed is then applied to analyze the aeolian vibrations of a well documented power line, for which experimental vibration measures are available.
