Galloping of insulated bundled overhead line - nonlinear numerical analysis in time domain

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F24%3A00585983" target="_blank" >RIV/68378297:_____/24:00585983 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.21495/em2024-190" target="_blank" >http://dx.doi.org/10.21495/em2024-190</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.21495/em2024-190" target="_blank" >10.21495/em2024-190</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Galloping of insulated bundled overhead line - nonlinear numerical analysis in time domain

Popis výsledku v původním jazyce

Our contribution focuses on a 3D numerical nonlinear analysis of galloping in a specific bundled overhead line with ice accretion. We studied the susceptibility to this self-excited oscillation, critical onset wind speeds, and global dynamic response of a very low-tensioned line with simulated icing observed on similar real conductors. Due to the highly nonlinear mechanical behavior of such a flexible cable, we employed the Newmark integration method combined with the iterative Newton-Raphson method. We analyzed two numerical models of the overhead line loaded by the wind: one assuming nonlinearity only in the wind load, while retaining the linearity of the mechanical system itself, and the other representing a fully nonlinear system including geometrical nonlinearity. Our analysis revealed that the determined critical wind speeds for the onset of galloping are in relatively close ranges for both models. However, numerical simulations with the fully nonlinear system indicated significantly lower amplitudes of limit cycle oscillations, especially at higher wind speeds, compared to the linear model of the line. This underscores the necessity of using fully nonlinear models during the design stage of such low-tensioned aerial conductors.

Název v anglickém jazyce

Galloping of insulated bundled overhead line - nonlinear numerical analysis in time domain

Popis výsledku anglicky

Our contribution focuses on a 3D numerical nonlinear analysis of galloping in a specific bundled overhead line with ice accretion. We studied the susceptibility to this self-excited oscillation, critical onset wind speeds, and global dynamic response of a very low-tensioned line with simulated icing observed on similar real conductors. Due to the highly nonlinear mechanical behavior of such a flexible cable, we employed the Newmark integration method combined with the iterative Newton-Raphson method. We analyzed two numerical models of the overhead line loaded by the wind: one assuming nonlinearity only in the wind load, while retaining the linearity of the mechanical system itself, and the other representing a fully nonlinear system including geometrical nonlinearity. Our analysis revealed that the determined critical wind speeds for the onset of galloping are in relatively close ranges for both models. However, numerical simulations with the fully nonlinear system indicated significantly lower amplitudes of limit cycle oscillations, especially at higher wind speeds, compared to the linear model of the line. This underscores the necessity of using fully nonlinear models during the design stage of such low-tensioned aerial conductors.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA24-13061S" target="_blank" >GA24-13061S: Kombinované účinky aeroelastických nestabilit na stavební konstrukce</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Engineering mechanics 2024. Book of full texts

ISBN

978-80-214-6235-9

ISSN

1805-8248

e-ISSN

—

Počet stran výsledku

4

Strana od-do

190-193

Název nakladatele

Brno University of Technology

Místo vydání

Brno

Místo konání akce

Milovy

Datum konání akce

14. 5. 2024

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

—