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Spatial Galloping Behavior of Iced Conductors under Multimodal Coupling.

Fujiang Cui1,2, Kaihong Zheng1, Peng Liu2

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Sensors (Basel, Switzerland)
|February 10, 2024
PubMed
Summary

This study analyzes iced bundled conductor galloping, revealing elliptical orbits during single-mode and "8" patterns during coupled-mode galloping. Findings offer a theoretical basis for transmission line design.

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Area of Science:

  • Mechanical Engineering
  • Electrical Engineering
  • Aerodynamics

Background:

  • Iced bundled conductors are susceptible to galloping, a dangerous aerodynamic instability.
  • Understanding multimodal coupling is crucial for predicting conductor behavior and preventing failures.

Purpose of the Study:

  • To derive and analyze the coupled ordinary differential equations for the first two modes of galloping in iced bundled conductors.
  • To determine critical conditions and analyze galloping patterns under various wind speed-sag parameters.
  • To investigate the impact of single and coupled mode galloping on spatial nonlinear behavior.

Main Methods:

  • Derivation of coupled ordinary differential equations for in-plane, out-of-plane, and torsional dynamics.
  • Numerical analysis to determine critical galloping conditions and parameter spaces.
  • Classification of parameter space into five distinct galloping regions.

Main Results:

  • Identified critical conditions for modal galloping within specific wind speed-sag parameter ranges.
  • Observed elliptical orbit motion during single-mode galloping.
  • Revealed "8" motion patterns during coupled-mode galloping, with two distinct variations.

Conclusions:

  • The study provides a comprehensive analysis of galloping dynamics in iced bundled conductors.
  • Distinguishes between single and coupled mode galloping behaviors.
  • Offers a theoretical foundation for enhancing transmission line design and stability.