THE FREE-VIBRATION OF LONG-SPAN TRANSMISSION-LINE CONDUCTORS WITH DAMPERS

The free vibration of a transmission line conductor equipped with a nu mber of Stockbridge dampers is modelled by a differential equation of motion of a tensioned beam acted on by concentrated frequency dependen t forces,;and an exact solution is obtained using integral transformat ion. By evaluation through aeolian vibration level computation, the ex pressions obtained for the mode shapes can be easily used to predict a ccurately the overall strains of lines in operation or under design. N umerical examples show that the usual sinusoidal mode shapes can be si gnificantly distorted by the dampers to give rise to dangerous strains . (C) 1997 Academic Press Limited.