Dynamics of stockbridge dampers

Wagner, Hans; Ramamurti, V.; Sastry, R.; Hartmann, Klaus

doi:10.1016/s0022-460x(73)80114-2

Cited by 47 publications

(18 citation statements)

References 1 publication

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“…Due to the inherent flexibility of the messenger cable and the kinematic constraint provided by the clamp, the two sides of the damper basically behave as uncoupled planar cantilevers, with inertial bodies at their ends providing lumped translational and rotational masses, and subjected to a motion of the support. Within this context, the motion mass 2 mass 1 of the th ( = 1, 2) inertial body of the damper, as it is customary in the modelling of Stockbridge dampers (see, e.g., [11]), can be completely described by specifying the vertical displacement ( ) of its centroid and the rotation ( ). It is also convenient to introduce for each side of the messenger cable the relative transverse displacement, V ( ), of the tip with respect to the clamped sections .…”

Section: Equations Of Motion Of Stockbridge Dampersmentioning

confidence: 99%

“…The free end of the specimen is then subjected to a prescribed transverse displacement at the tip, while recording the corresponding transverse force applied to the strand (or vice versa). The load-displacement curves can be obtained both for monotonically increasing and for cyclically varying transverse displacements (or forces) and assumed as a reference to characterize the overall bending behaviour of the strand (see, e.g., [10,11]).…”

Section: Identification Of the Model's Parametersmentioning

confidence: 99%

“…Whenever the damper is actuated by the motion of the clamp, the two sides of the messenger cables basically behave as flexible cantilevers with lumped translational and rotational masses at their ends and two principal vibration modes. The normal modes of the messenger cables are, respectively, related to the translation and to the rotation of the inertial bodies attached at their end sections (see, e.g., [10][11][12]).…”

Section: Introductionmentioning

confidence: 99%

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Hysteretic Behaviour of Stockbridge Dampers: Modelling and Parameter Identification

Foti

Martinelli

2018

Mathematical Problems in Engineering

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Stockbridge dampers are widely used to mitigate the vortex-induced vibrations of overhead electrical line conductors and of many other cable or cable-like structures exposed to the action of wind. Aim of this work is to develop a simple, but accurate, mechanical model of a Stockbridge damper to use in the assessment of such structures vibrations. The model is based on a beam-like description of the messenger cable and on a nonlinear formulation of the cross sections cyclic bending behaviour. At the cross-sectional level, the mechanical behaviour of the messenger cable is reproduced with the classic Bouc-Wen hysteretic model, which has been recognized as adequate to represent the local behaviour mainly controlled by interwire sliding processes. The Bouc-Wen model parameters are identified from experimental results available in literature and used at the local (cross-sectional) level to characterize the mechanical behaviour of the messenger cable. The descending global behaviour of the Stockbridge damper compares very favourably with the experimental results in terms of the impedance function at the clamp and allows for the confident use of the proposed model inside the assessing process of full power lines. The important role of the end zones of the messenger cable is highlighted. In these zones, a boundary layer like transition is found to occur for the bending stiffness of the messenger cable cross section. This largely affects the global behaviour of the Stockbridge damper. The length of these zones complements the model parameters.

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Section: Equations Of Motion Of Stockbridge Dampersmentioning

confidence: 99%

Section: Identification Of the Model's Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hysteretic Behaviour of Stockbridge Dampers: Modelling and Parameter Identification

Foti

Martinelli

2018

Mathematical Problems in Engineering

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“…The symmetric Stockbridge damper exhibits two resonant frequencies while the asymmetric Stockbridge damper has four [8], [9]. Conventional mathematical models of the Stockbridge damper assume the system to be a 2 DOF system [10], [11] with the counterweight to be a lumped mass and the messenger to be a massless beam. Other nonlinear models [12], [13] use the energy method to model the system.…”

Section: Nomenclaturementioning

confidence: 99%

Finite Element Modeling of Stockbridge Damper and Vibration Analysis: Equivalent Cable Stiffness

Vaja

Barry

DeJong

2017

Volume 8: 29th Conference on Mechanical Vibration and Noise

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Abstract-Aeolian vibrations are the major cause for the failure of conductor cables. Using a Stockbridge damper reduces these vibrations and increases the life span of the conductor cable. Designing an efficient Stockbridge damper that suits the conductor cable requires a robust mathematical model with minimum assumptions. However it is not easy to analytically model the complex geometry of the messenger. Therefore an equivalent stiffness must be determined so that it can be used in the analytical model. This paper examines the bending stiffness of the cable and discusses the effect of this stiffness on the natural frequencies. The obtained equivalent stiffness compensates for the assumption of modeling the messenger as a rod. The results from the free vibration analysis of the analytical model with the equivalent stiffness is validated using the full scale finite element model of the Stockbridge damper.

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“…Experimental studies on the stockbridge dampers also have been carried out. Wagner et al (1973) conducted in-depth study on the dynamic characteristics of stockbridge dampers installed on conductors. Schmidt (1997) used two test methods provided by "IEEE guide on conductor selfdamping measurements" (IEEE Std.…”

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confidence: 99%

Experimental Study on Mitigation Devices of Aeolian Vibration of Bundled Conductors

Cao

Jiang

et al. 2013

Advances in Structural Engineering

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Aeolian vibration of transmission conductors could cause triggering off shares and broken due to fatigue damage and thus of concern. To ensure the safety of electrical transmission systems, mitigation devices are usually installed on the conductors to suppress the aeolian vibration. This paper investigates effects of three types of such devices on bundled conductors experimentally, including spacer dampers, damping lines and stockbridge dampers. For this purpose, vibration tests of twin and four bundled conductors were designed and carried out according to IEEE standards. Firstly, the vibration characteristic of the twin bundled conductors equipped with the spacer damper and stockbridge damper were tested with different installation configuration of wire damper sets. The vibration tests of four bundled conductors were also carried out, and the energy dissipation power calculation of spacer damper has been given. The calculation method of energy dissipation power calculation of spacer damper can reflect the properties of the energy dissipation and the method is proven to be reasonable according to the test.

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Dynamics of stockbridge dampers

Cited by 47 publications

References 1 publication

Hysteretic Behaviour of Stockbridge Dampers: Modelling and Parameter Identification

Hysteretic Behaviour of Stockbridge Dampers: Modelling and Parameter Identification

Finite Element Modeling of Stockbridge Damper and Vibration Analysis: Equivalent Cable Stiffness

Experimental Study on Mitigation Devices of Aeolian Vibration of Bundled Conductors

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