Vol.1, No 7, 2000 pp. 769 - 773
UDC 625.5:551.311.3

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THE ENERGY BALANCE
FOR DAMPED WIND-EXCITED VIBRATIONS
Elizabeta Bahtovska
Faculty of Technical Sciences, Bitola, Makedonija

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Abstract. In the calculation of wind-excited overhead transmission line with Stockbridge dampers the damper behavior is usually represented by its impedance corresponding to a vertical translatory damper clamp motion. The moments introduced by the damper into the cable are normally disregarded. In this paper the dampers are characterized by means of a 2 ? 2 complex impedance matrix which can be experimentally determinated in the laboratory and which includes the effects of the rotatory motion of the clamp. The energy balance method is then adapted to this case and the bending strains in the cable are calculated at the dangerous points. It turns out that the moments introduced by the damper into the cable are of little or no importance with regard to the energy absorbed. They may however affect strongly the local bending strains in the cable at the damper clamp.

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ENERGIJSKI BILANS ZA AMORTIZOVANE
VETROM POBUĐENE VIBRACIJE Različiti tipovi mehaničkih vibracija nastaju kod žičara i često dovode do ozbiljnih oštećenja. U radu su izučavane eolske vibracije, koje imaju uobičajenu učestanost 10-100 Hz i koje mogu da dovedu do otkaza zbog zamora materijala. U ovom radu su razmatrani i energijski bilansi za amortizovane vetrom pobuđene vibracije kao i energija koju disipiraju amortizer i kabl.