Theoretical Analysis and Experimental Validation on Galloping of Iced Transmission Lines in a Moderating Airflow

Huo, Baofeng; Li, Xuliang; Cui, Fujiang; Yang, Shuo

doi:10.1155/2021/9969435

Cited by 3 publications

(3 citation statements)

References 25 publications

(25 reference statements)

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“…Meanwhile, galloping experiments have been conducted using wind tunnels suitable for continuous iced conductor models. The galloping of single iced conductors under a trapezoidal wind field has been experimentally validated [29]. In addition, experimental studies have also been performed on the galloping characteristics of three-phase iced bundled conductors and the galloping control of interphase spacers through dynamic similarity between the model and prototype of conductors [30,31].…”

Section: Introductionmentioning

confidence: 99%

A simultaneous measurement method for multi-directional galloping of iced bundled conductors and its application in spatial galloping behavior

Cui,

Liu,

Wang

et al. 2024

Meas. Sci. Technol.

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The theoretical results indicate that iced bundled conductors experience spatial gallop-ing due to wind-induced vibration, involving in-plane, out-of-plane, and torsional movements. To better understand the dynamic response of this behavior from an exper-imental perspective, an innovative experimental method has been proposed. The method can simultaneously measure the in-plane, out-of-plane, and torsional vibration signals of iced bundled conductors’ galloping. A testing system was established, and the method is applied in the galloping experiment of continuous iced bundled conductors, validating some theoretical results. This paper describes the construction of a wide-aperture, low-speed wind tunnel suitable for testing the galloping of continuous iced bundled conduc-tors. A “cut-bury-glue” method was proposed to create a model of continuous iced bun-dled conductors effectively, along with a method for connecting subconductors to im-prove experimental precision. The tests utilized laser displacement sensors and wireless posture sensors, considering the installation and data collection characteristics of the sensors. Through signal conversion, error correction, and other technical methods, sim-ultaneous measurement of in-plane, out-of-plane, and torsional vibration signals was achieved. The spatial galloping behavior, changing with wind speed, exhibits limited-amplitude and synchronous characteristics. The participation of different modes shows elliptical orbital motion in single-mode galloping and “8” shaped orbital motion in cou-pled-mode galloping. These results are consistent with previous theoretical research, offering a new approach to studying iced bundled conductors’ galloping.

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Section: Introductionmentioning

confidence: 99%

A simultaneous measurement method for multi-directional galloping of iced bundled conductors and its application in spatial galloping behavior

Cui,

Liu,

Wang

et al. 2024

Meas. Sci. Technol.

Self Cite

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“…The galloping of a conductor may involve multi-order modes, which was not considered in the previous models. The conductor models considering multi-mode and multi-degree-of-freedom were developed to accurately describe the galloping of the transmission line (Luongo and Zulli, 2012; Yan et al, 2012; Liu and Huo, 2015; Cui et al, 2018; Huo et al, 2021). Research showed that the second galloping mode is more triggered.…”

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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“…Once the FIV-PEH is placed in a flow field with a sufficiently high flow speed, FIVs may occur, and electrical power can then be produced [33][34][35]. Considering the cut-in wind speed, the start-oscillation condition, and the structural design complexity, VIV and galloping harvesters are pretty efficient in harnessing energy from wind flows [36,37].…”

Section: Introductionmentioning

confidence: 99%

Investigation of hybridized bluff bodies for flow-induced vibration energy harvesting

Wang¹,

Wang²,

Hu³

2022

J. Phys. D: Appl. Phys.

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Small-scale wind energy harvesting based on flow-induced vibration mechanisms has attracted lots of research interest in recent years. Vortex-induced vibration (VIV) and galloping energy harvesters usually outperform each other in different wind speed ranges. To combine the advantages of VIV and galloping harvesters, this paper explored the idea of using a hybridized bluff body constituted of two cylindrical and one cuboid segment for wind energy harvesting. The total length of the hybridized bluff body was fixed. The cuboid segment length was varied to investigate the effect on the flow-induced vibration behavior of the bluff body. The results show that when the cuboid segment length is small, the bluff body exhibits VIV-like behavior in the low wind speed range and galloping-like behavior in the high-speed range. In the medium wind speed range, there appears galloping-VIV coupling. However, if the cuboid segment becomes large, the galloping-VIV coupling phenomenon disappears; the hybridized bluff body behaves just like a cuboid one and only exhibits galloping motion. In addition to experiments, CFD simulations were also conducted to provide more insights into the aerodynamics of the hybridized bluff body. The simulation results reveal that introducing hybridization into the bluff body changes the vorticity flow behind it and the vortex shedding behavior. The vortex shedding effect, in turn, affects the vibration of the bluff body, as well as the performance of the harvester.

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Theoretical Analysis and Experimental Validation on Galloping of Iced Transmission Lines in a Moderating Airflow

Cited by 3 publications

References 25 publications

A simultaneous measurement method for multi-directional galloping of iced bundled conductors and its application in spatial galloping behavior

A simultaneous measurement method for multi-directional galloping of iced bundled conductors and its application in spatial galloping behavior

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

Investigation of hybridized bluff bodies for flow-induced vibration energy harvesting

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