Various forms of dampers are used to suppress vibrations in transmission lines. In the present paper a study has been made on vibrations of transmission lines having one or more dampers (Stockbridge type) near each end of the span for different cable lengths. An attempt is made here to study the effect of the location of dampers on maximum strains produced in the line. A comparative study of the maximum strains produced is also made for various wind power input assumptions. In addition, a finite difference method is used to find the natural frequency and a finite element method is used to find the natural frequency and mode shapes of the cable with and without a damper. © 1978 Academic Press Inc. (London) Limited.

Natrajan Ganesan

B. V.A. Rao

STRUCTURAL ANALYSIS - WIND EFFECTS

Electric Lines

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Transmission line vibrations

Journal of Sound and Vibration

Aeolian vibrations in the frequency range of 10-50 Hz are ubiquitous in the conductors of transmission lines. They are usually not perceptible to the casual observers due to their small amplitudes, nevertheless, they are important as they may lead to failure of the lines through material fatigue. These problems become more severe for long-span lines. Since the conductors are fabricated in finite lengths, every once in a while two conductors have to be connected in the field, using appropriate fittings. A particular case of fitting, considered in this paper, is the compression splice bushing (CSB), which is sometimes used in long spans to join the ends of two conductors. It is desired to estimate the values of the maximum bending stress developed in the conductors and in related fittings due to aeolian vibrations. An obvious approach would be to solve the boundary value problem for the conductors with the CSB; here a model is presented that avoids the solutions of the complete boundary value problem and results in solving a set of linear algebraic equations. © 2006 Elsevier Ltd. All rights reserved.

Wind-excited overhead transmission lines: Estimation of connection stresses at junctions

Higher modes of transmission lines with dampers

Transmission line vibration with 4R dampers

Prismatic shells find wide application in mechanical, civil and aeronautical engineering. The object of this paper is to propose a method of analysing such shells having different internal ribbing for their torsional vibrations. The governing equations of motion are derived by using a finite difference method and solved by the simultaneous iteration technique. The accuracy of the method is ascertained by comparing the results for some wellknown boundary conditions with the results obtained by classical methods. Shells of square cross-section and rectangular shells of variable and constant cross-section have been analysed. The effects of introduction of diaphragms on the eignefrequencies have been analysed. The effects of variations in shell thickness and length on the dynamic behaviour also have been studied. © 1975 Academic Press Inc. (London) Limited.

Torsional vibrations of prismatic shells

The aim of the present investigation is to establish a theoretical analysis of the response characteristics of Stockbridge dampers and to verify the theoretical predictions experimentally. Expressions have been derived for the response of the Stockbridge damper, by treating it as a two-degree-of-freedom system. The dynamic stresses introduced on the stranded cable are also theoretically determined. The experimental findings have been reported and explanations for discrepancies, where they occur, have been made. © 1973 Academic Press Inc. (London) Limited.

Journal	Journal of Sound and Vibration
ISSN	0022460X
Open Access	No