Energy Method to Compute the Maximum Amplitudes of Oscillation Due to Galloping of Iced Bundled Conductors

Diana, Giorgio; Manenti, A.; Melzi, Stefano

doi:10.1109/tpwrd.2020.3027157

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…In addition, the finite element method is widely used to simulate the galloping of iced conductors. Diana et al [12] presented a finite-element model of quad-bundled conductors, predicting the onset speed of galloping instability and the maximum oscillation amplitudes through time-domain simulations and the proposed energy approach. The complex structural part of the system can also be reproduced, including iced eight-bundled conductors [13,14] and a tower line system [15].…”

Section: Introductionmentioning

confidence: 99%

Spatial Galloping Behavior of Iced Conductors under Multimodal Coupling

Cui,

Zheng,

Liu

et al. 2024

Sensors

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In this study, the coupled ordinary differential equations for the galloping of the first two modes in iced bundled conductors, including in-plane, out-of-plane, and torsional directions, are derived. Furthermore, through numerical analysis, the critical conditions of this modal galloping are determined in the range of wind speed–sag parameters, and the galloping patterns and variation laws in different parameter spaces are analyzed. The parameter space is then divided into five regions according to the different galloping modes. Under the multimodal coupling mechanism of galloping, the impact of single and two kinds of coupled mode galloping on the spatial nonlinear behavior is explored. The results reveal that the system exhibits an elliptical orbit motion during single mode galloping, while an “8” motion pattern emerges during coupled mode galloping. Moreover, two patterns of “8” motion are displayed under different parameter spaces. This research provides a theoretical foundation for the design of transmission lines.

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Section: Introductionmentioning

confidence: 99%

Spatial Galloping Behavior of Iced Conductors under Multimodal Coupling

Cui,

Zheng,

Liu

et al. 2024

Sensors

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“…It can be seen from the figure that Den Hartog coefficients are always positive, and the Nigel damping coefficients are negative in the range of 50 • to 140 • wind attack angle, that is, the four-split conductor will gallop mainly due to torsional vibration in this wind attack angle range. The galloping results from a combination of torsional and vertical motion of the bundle, which are coupled by the aerodynamic forces [42]. Figure 8 shows the curves of Den Hartog and Nigel damping coefficients with the wind attack angle.…”

Section: Galloping Analysis Based On Den Hartog and Nigel's Theoriesmentioning

confidence: 99%

Aerodynamic Force and Aeroelastic Response Characteristics Analyses for the Galloping of Ice-Covered Four-Split Transmission Lines in Oblique Flows

Chen

Cai

et al. 2022

Sustainability

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In order to study the galloping mechanism of ice-covered four-split transmission lines in oblique flows, the aerodynamic forces and aero-elastic response characteristics of the crescent-shaped four-split ice-covered transmission lines are investigated through wind tunnel tests on rigid and aero-elastic models. According to Den Hartog and Nigel’s galloping theories, the damping coefficients are calculated based on the experimental data. The results show that the crescent-shaped ice-covered four-split transmission lines usually suffer from torsional galloping. Furthermore, based on the aero-elastic wind tunnel data, the galloping is characterized by an elliptical trajectory, negative damping ratio, and a negative strain at hanging position. In addition, the galloping appears to be more prone to occur under oblique flows, with a larger galloping amplitude and a lower critical wind speed. This might be because an out-of-plane vibration of the third-order mode is excited at a lower wind speed, leading to a coupled resonance between in-plane and out-of-plane vibrations at the third-order mode with a frequency ratio of 1:1. The experimental results in this paper can also be used to verify the fluid-structure interaction simulation method of ice-covered transmission lines.

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“…Because galloping is a very complex phenomenon, it is still not completely defined in all its aspects; performing a prediction on the dynamic behavior of a galloping conductor by means of a mathematical model can be a very difficult task [ 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Wind-Induced Vibrations on HVTL Conductors Using Wireless Sensors

Zanelli

Mauri

Dezza

et al. 2022

Sensors

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In a world accelerating the energy transition towards renewable sources, high voltage transmission lines represent strategic infrastructure for power delivery. Being slender and low-damped structures, HVTL conductors are affected by wind-induced vibrations that can lead to severe fatigue issues in conductors and other components. Vibration monitoring could represent a key activity to assess the safety level of the line and perform condition-based maintenance activities. This work proposes an innovative approach based on the knowledge of the physical phenomena and smart technological devices. A wireless monitoring system based on MEMS accelerometers and energy harvesting techniques has been designed to measure the fymax parameter in the field, which represents a fatigue indicator useful to identify the different wind-induced phenomena and assess the conductors’ strain level. A field test on a Canadian transmission line was used in the check of the efficiency of the system and collection of significant data. Vibrations due to vortex shedding were identified with a maximum value of fymax = 50 m/s, while subspan oscillation and galloping were not observed. We show the novel method can detect the different wind-induced phenomena and pave the way to the development of suitable software able to compute a conductor’s residual fatigue life.

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Energy Method to Compute the Maximum Amplitudes of Oscillation Due to Galloping of Iced Bundled Conductors

Cited by 5 publications

References 15 publications

Spatial Galloping Behavior of Iced Conductors under Multimodal Coupling

Spatial Galloping Behavior of Iced Conductors under Multimodal Coupling

Aerodynamic Force and Aeroelastic Response Characteristics Analyses for the Galloping of Ice-Covered Four-Split Transmission Lines in Oblique Flows

Analysis of Wind-Induced Vibrations on HVTL Conductors Using Wireless Sensors

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