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Journal ArticleDOI

Transmission line vibration with 4r dampers

22 Oct 1978-Journal of Sound and Vibration (Elsevier BV)-Vol. 60, Iss: 4, pp 604-606
About: This article is published in Journal of Sound and Vibration.The article was published on 1978-10-22. It has received 10 citation(s) till now. The article focuses on the topic(s): Damper. more

Topics: Damper (54%)
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Journal ArticleDOI
Peter Hagedorn1Institutions (1)
Abstract: In the calculation of wind-excited overhead transmission line vibrations with Stockbridge dampers the damper behaviour is usually represented by its impedance corresponding to a vertical translatory damper clamp motion. The moments introduced by the damper clamp 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 determined 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. more

75 citations

Journal ArticleDOI
Weidong Zhu1, G. Y. Xu1Institutions (1)
Abstract: The effects of bending stiffness and boundary conditions on the lateral vibration of the stationary and moving hoist cables are investigated. The role of the trial functions in the approximate methods is examined. The optimal stiffness and damping coefficient of the suspension of the car against its guide rails are identified for the moving cable.Copyright © 2002 by ASME more

55 citations

Journal ArticleDOI
M.L. Lu, John Chan1Institutions (1)
Abstract: A novel algorithm is developed in this paper for analyzing Aeolian vibration of a span of a single conductor with multiple dampers. The algorithm is characterized by a combination of an impedance transfer technique (ITT) and a forced vibration method (FVM). The ITT avoids singularities that may occur due to a conductor's very low bending stiffness with respect to its tension. On the other hand, the FVM can easily handle non-proportional damping (which is typical for the problem in concern) without having to solve a complex eigenvalue problem. In addition, the algorithm can easily accommodate a conductor's terminal flexibility as well as a damper's rotational effect that may exist due to its possible asymmetry. The algorithm is very efficient so that solution is almost instantaneous for most analysis problems. The algorithm has recently been implemented into a commercial Aeolian vibration analysis and design software-EPRI Vibration version 3.0. more

34 citations

Journal ArticleDOI
Abstract: This paper reports a systematic investigation on the linear and nonlinear dynamics of a suspended cable, taking bending stiffness into account. Firstly, the linear dynamics features, for example, e... more

14 citations

Cites methods from "Transmission line vibration with 4r..."

  • ...It has been used successfully to avoid the singular behaviors associated with vanishing cable tension (Triantafyllou and Triantafyllou, 1991; Burgess, 1993), to account for external moments (Dhotarad et al., 1978) and to determine the local bending stress (Irvine, 1993)....


Journal ArticleDOI
Chan-Jung Kim1Institutions (1)
Abstract: A Stockbridge damper system can control the aeolian vibrations in a transmission line by dissipating excitation energy through the self-excitation of the damper system. Therefore, locating these resonant frequencies is a critical design consideration for a Stockbridge damper to determine the efficiency of spectral energy dissipation. In this study, the design strategy of a damper was investigated after conducting a design sensitivity analysis of the resonant frequency of a Stockbridge damper that considered several design parameters, including length of the messenger wire, inertia of the counterweight, and gyration radius of the counterweight. The formulation of the design sensitivity analysis was performed using partial derivatives of the eigenvalues with respect to each design parameter over two resonant frequencies. The sensitivity formulations were validated through a case study of eigenvalues that considered a variation of up to ±30 % in the values of the design parameters. The design guidelines for a Stockbridge damper were derived from the sensitivity analysis results. more

11 citations

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Journal ArticleDOI
Rodolfo Claren, Giorgio Diana1Institutions (1)
Abstract: The response of stranded cables to exciting forces produced by wind is studied here, and details of an analytical and experimental study of cable self-damping are presented. more

98 citations

Journal ArticleDOI
Abstract: 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. more

39 citations

Journal ArticleDOI
M.S. Dhotarad1, N. Ganesan1, B.V.A. Rao1Institutions (1)
Abstract: 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. more

25 citations

Journal ArticleDOI
01 Oct 1974-
Abstract: A new method is presented for determining the effectiveness of dampers used to suppress aeolian vibration on overhead lines. The method is applied to a Stockbridge damper and a simple picture is presented of the way in which this damper works. A second type of vibration damper is also considered, to demonstrate the way in which the performance of different dampers can be evaluated and compared using the new method. more

9 citations

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