Modal Analysis of the Iced Transmission Line Based on Three-Dimensional Curved Beam Element

Xiong, Hao; Li, Zheng Liang; Yan, Zhi Tao

doi:10.4028/www.scientific.net/amr.291-294.2049

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…Yan et al (2013Yan et al ( , 2014 used this model to analyze the galloping response of the transmission line, which could effectively simulate the galloping. Xiong et al (2011) simplified the curved beam model and verified the model through a classical example. The results indicated that the bending modulus of the transmission line had a great effect on the translation and rotation frequency, and the eccentricity of the iced conductor could slightly reduce the frequency of the conductor, but the aerodynamic forces on the structural frequency were not analyzed.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamic analysis of galloping of a single iced conductor with four degrees of freedom based on curved beam theory

Yan

Zhang

et al. 2022

Advances in Structural Engineering

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Based on the nonlinear strain-displacement relationship of spatial curved beam theory, a finite element model for galloping analysis of iced transmission lines is established, which involves three translational degrees of freedom (DOF) and one rotational degree of freedom for each node. Considering the aerodynamic nonlinearity and the geometric nonlinearity of large amplitude motions of the iced transmission line, the nonlinear dynamic finite element equation is presented by using the virtual work principle. The equation is transformed into the sub-space according to the mode superposition method and a time integration algorithm is also performed in the sub-space. Then, the element independence and modal convergence are researched. Finally, the influence of aerodynamic forces on structural frequency is analyzed. The numerical results show that aerodynamic forces will greatly affect the torsional frequency of the transmission line, which accurately reflects the dynamic characteristics of transmission lines. Furthermore, the galloping calculation of the transmission line has reliable accuracy by using 4-DOF (per node) elements for the iced conductor. On the other hand, the model can predict the actual galloping response of the transmission line, which is convenient for the implementation of subsequent control design.

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Section: Introductionmentioning

confidence: 99%

Nonlinear dynamic analysis of galloping of a single iced conductor with four degrees of freedom based on curved beam theory

Yan

Zhang

et al. 2022

Advances in Structural Engineering

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Anti-galloping analysis of iced quad bundle conductor based on compound damping cables

Zhang,

Han,

et al. 2024

Engineering Structures

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Experimental study on the galloping characteristics of single ice-coated transmission lines under oblique flows

Gao

Chen

et al. 2023

Sci Rep

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Galloping of ice-coated transmission lines is occasionally observed under oblique wind directions. However, most current investigations on the galloping mechanisms are for flow perpendicular to the span of the transmission lines. In order to address this gap, this research studies the galloping characteristics of ice-coated transmission lines under oblique flows based on wind tunnel tests. The wind-induced displacement of an aero-elastic iced-coated transmission line model was measured with a noncontact displacement measurement equipment in a wind tunnel at different wind speeds and directions. The results show that galloping is characterized by elliptical trajectories and negative damping, which is more likely to occur under oblique flows than the direct flow (0°). At 15° wind direction, a galloping in vertical direction was observed at wind speeds above 5 m/s. At 30° wind direction, galloping was observed over the entire range of the tested wind speeds. Moreover, the galloping amplitudes under oblique flows are observed to be larger than that at the direct flows. Consequently, when the wind direction between the major winter monsoon azimuth and the lateral direction of transmission line route is between 15° and 30°, appropriate anti-galloping devices are highly recommended in practice.

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Modal Analysis of the Iced Transmission Line Based on Three-Dimensional Curved Beam Element

Cited by 3 publications

References 12 publications

Nonlinear dynamic analysis of galloping of a single iced conductor with four degrees of freedom based on curved beam theory

Nonlinear dynamic analysis of galloping of a single iced conductor with four degrees of freedom based on curved beam theory

Anti-galloping analysis of iced quad bundle conductor based on compound damping cables

Experimental study on the galloping characteristics of single ice-coated transmission lines under oblique flows

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