The effectiveness of vibration damper attached to the cable due to wind action

Abstract

Abstract. In the paper the analysis of vibration of cable with attached damper is performed. Source of vibrations comes from the wind. The level of reduction of vibrations is also analysed. Damper attached to the cable is characterized by mass, stiffness and damping ratio. The paper also presents the equations of motion for the cable with damper, taking into account the initial parameters: cable cross-section and the location of the damper. The analysis is performed in time domain. It is discussed that in real situations the different types of cable vibration due to their amplitudes and frequencies is met: short-term oscillations of high amplitude, caused by a single impulse force, called bouncing cable, low amplitude and low wave length and the high frequency, called aeolian vibration, large oscillation amplitude, long wave length and low frequency, called galloping or dancing cables.

Analytical estimation of inertial properties of the curved rotating section in a drill string

“…Some authors [5,12] believe that reducing the vibrations of drilling equipment might be the key to maintaining the dynamic stability of a drill string in general. The relevant issues on designing vibration protection devices for long structures (drill strings, pump-and-compressor rods) were considered in papers [13][14][15]. Specifically, study [13] presented designs of inertial devices to control the dynamic mode of a drill string, which simultaneously act as collared drill pipes.…”

“…A special feature of the proposed designs is the optimal combination of amortization and damping properties, which makes it possible to significantly reduce the dynamic loads on a string of rods. Authors of work [15] employed the effects that are based on the phenomenon of antiresonance to develop a broadband vibration damper for the long elements of structures.…”

Measurements in Situ and Spectral Analysis of Wind Flow Effects on Overhead Transmission Lines

“…There are some theoretical and experimental researches on overhead transmission lines [1][2][3][4][5]. Wind forces cause 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 [6][7][8][9].…”