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.
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.
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