Optimum Design of Vis co elastic Dynamic
Neutralizers for Overhead Transmission Lines:
Distributed Excitation Model
(-)Abstract
It is well known that overhead transmission lines
are particularly prone to aeolian excitations. Because of those
excitations and of their own characteristics, the lines may work
in resonance, with high vibration amplitudes, which could lead
to fatigue. To increase the life time of those structures, dynamic
neutmlizers are used. The dynamic neutralizers used nowadays
are extremely efficacious at some discrete frequencies, but very
disappointing away from those, still within the frequency range
of concern. The employment of viscoelastic dynamic neutralizers
aims to control the vibrations in a wide frequency band, due to
the large damping usually introduced by viscoelastic materials.
In this work, a fresh methodology to optimally design a system
of vtscoelastic dynamic neutralizers is proposed, regarding the
excitation as distributed along the line, which simulates the real
action of the wind. Results based on numerical simulations over
~ 30 m long experimental line are presented.
