Název: Influence of torsional stiffness on the galloping instability of a low-voltage insulated power line
Autoři: Macháček, Michael ; Hračov, Stanislav
Typ dokumentu: Příspěvky z konference
Konference/Akce: Computational mechanics 2024 /39./., Srní (CZ), 20241104
Rok: 2024
Jazyk: eng
Abstrakt: Our research contribution focuses on a three-dimensional nonlinear numerical study of the galloping phenomenon in a specific bundled overhead power line affected by ice accumulation. We investigated the susceptibility to this self-induced oscillatory behavior at critical wind speeds necessary to initiate the dynamic response in a low-tension cable with simulated icing that parallels observations on analogous real-world conductors. Given the highly nonlinear mechanical properties of such flexible cables, we employed the Newmark integration technique in conjunction with the iterative Newton-Raphson approach. We analyzed two numerical models of the overhead line under wind loading: one assumes linear mechanical behavior under nonlinear wind loading, while the other incorporates full nonlinearity, including geometrical aspects. Our study assessed the impact of torsional stiffness on galloping instability, finding that considering torsional stiffness and the three-dimensional movement of cables under wind can amplify the dynamic response during galloping.
Klíčová slova: FEM nonlinear system; galloping; ice accreation; power line; wind
Číslo projektu: GA24-13061S (CEP)
Poskytovatel projektu: GA ČR
Zdrojový dokument: Computational mechanics 2024. Proceedings of computational mechanics 2024, ISBN 978-80-261-1249-5

Instituce: Ústav teoretické a aplikované mechaniky AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: https://hdl.handle.net/11104/0357810

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-668241


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Konferenční materiály > Příspěvky z konference