Displacement response of transmission line conductors during random wind gusts Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/rj430808j

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  • The mean square displacement response of a point on a transmission line conductor that is subjected to wind gust generated lift forces is computed. The wind gust velocity and wind gust generated lift forces are treated as random processes in both time and space. A lift force, that is velocity dependent and which acts perpendicular to the wind direction, is computed at discrete points on the transmission line conductor and lift force spectral density functions are calculated and applied to the conductor at those discrete intervals. The energy components of the vibrating conductor are combined in a variational equation from which the conductor's equation of motion is extracted. The mode shapes and resonant frequencies are subsequently computed. The displacement response is calculated for a finite number of displacements of single degree of freedom systems and combined by modal analysis. The frequency response functions of the conductor are computed for each of the resonant frequencies. Mode shapes, frequency response functions, and the spectral density forcing functions are combined, and simplifications to the formulation are made. An example problem is presented and the results are compared to other studies and to observed values. A method is presented whereby parametric studies of conductor properties, as they effect the amplitude of aeolian vibrations, can be carried out.
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