Transactions section: Conductor vibration — Theory of torsional dampers

The paper is a theoretical treatment of the torsional damper which has been applied effectively to the protection of transmission line conductors from fatigue failures due to aeolian vibrations. The formulae of the energy dissipation are derived for three cases, viz., a single rigid damper, two rigid dampers at one end of a span, and a single damper with a resilient joint at the centre of gravity. The results are valuable in understanding the mode of operation of the torsional damper and point to certain optimum features of design. The formulae can be used for numerical calculations when the physical constants are known.