DYNAMIC MODEL OF HIGH-FREQUENCY VIBRATION DAMPERS FOR POWER LINE CONDUCTORS
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Abstract
A dynamic model of an aeolian vibration damper for overhead power transmission line conductors has been developed, taking into account energy dissipation in the material structure. Based on the model, a dynamic stiffness matrix of the damper has been obtained, intended for use in a combined dynamic model of "conductor – damper". The damper's cable consoles are considered as beams made of a material with internal friction, to which the concept of microplastic deformations is applied. It is believed that the damper design is symmetrical relative to the vertical plane of the conductor sag, and during oscillations, it moves in this plane. The equations of oscillations are obtained in Lagrange form in matrix notations. The influence of the damping coefficient on energy dissipation power and oscillation amplitudes in resonance modes has been studied. The coefficients of amplitude and phase distribution (shape factor) of translational and rotational oscillations of loads have been determined depending on the radius of inertia and load eccentricity. Dimensionless nomograms of the damper arm's natural frequencies have been constructed in relevant parameter change ranges. The dependence of dimensionless dissipation power on frequency has been investigated.
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