Abstract
Over the last years, there has been intensive development of technologies applied to protect structures such as overhead transmission lines, chimneys, high rise buildings from excessive dynamic effects leading to their damage or destruction. In the paper special attention is put on the system of passive dampers applied to overhead transmission lines and dampers used in oil and gas industry. The efficiency of the aeolian damper is presented. The constructions of weighted drill pipes with vibration-impact particle dampers designed to absorb the energy of longitudinal and twisting oscillations of the drill tool are described. The advantage of a multi-container absorber is substantiated. The application aspects of the inertial dampers developed by the authors are combined using a common effect based on the antiresonance phenomenon.
Highlights
In the paper special attention is put on the system of passive dampers applied to overhead transmission lines and dampers used in oil and gas industry
Overhead transmission lines are constantly subject to variable wind loads which may gradually lead to the impairment of their durability, resulting in the shortened service life
Wind forces are caused by three main types of conductor vibrations: aeolian vibrations with a frequency from 3 to 150 Hz and amplitudes lower than the conductor diameter, galloping with a frequency from 0.1 to 1 Hz and amplitudes from ±0.1 to 1 of conductor sag, wake induced vibrations with a frequency from 0.15 to 10 Hz and amplitudes from 0.5 to 80 times the conductor diameter [1]
Summary
Overhead transmission lines are constantly subject to variable wind loads which may gradually lead to the impairment of their durability, resulting in the shortened service life. The majority of common wind induced vibrations are aeolian vibrations These vibrations are generated as a result of vortices shed in the conductor wake under sustained wind of low speed from 1 to 7 m/s – they occur mainly in the vertical plane. Another phenomena of vibrations of overhead transmission lines is galloping. The energy of vibrations is dissipated through friction caused by slippage between the messanger wires Another type of spiral damper is the Air Flow Spoiler. It combines properties of a torsional damper and detuner This damper increases the value of a critical speed of wind, above which galloping occurs, and reduces its amplitudes. 2-3 dampers are installed along the span [6]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
