Estimation of wind deflection of high-speed railway catenary based on nonlinear finite element method
The electrified railway catenary generates wind deflection and vibration under wind load. The longitudinal wind deflection affects the current collection quality of the contact wire and the pantograph, and causes contact force fluctuations and pantograph-catenary separation fault. The lateral wind d...
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| Format: | Article |
| Language: | zho |
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Editorial Department of Electric Drive for Locomotives
2023-07-01
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| Series: | 机车电传动 |
| Subjects: | |
| Online Access: | http://edl.csrzic.com/thesisDetails#10.13890/j.issn.1000-128X.2023.03.105 |
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| Summary: | The electrified railway catenary generates wind deflection and vibration under wind load. The longitudinal wind deflection affects the current collection quality of the contact wire and the pantograph, and causes contact force fluctuations and pantograph-catenary separation fault. The lateral wind deflection increases the contact area of the pantograph’s sliding strip, and in severe cases, the contact line is off-line laterally, resulting in pantograph scraping accidents. This paper conducted an in-depth research on the wind deflection characteristics of catenary systems in strong wind areas, and proposed a calculation method for catenary wind deflection based on nonlinear finite element to provide guidance for catenary design and wind deflection prevention. The specific methods are as follows: Considering the irregular shape of the contact wire cross-section, a hydrodynamic calculation model of the contact wire cross-section was constructed in Fluent, and the aerodynamic coefficients of the contact wire under different attack angles were obtained through the flow simulation. The static wind load model of the contact wire and the messenger wire was deduced by fluid induced vibration theory, based on a comprehensive consideration of the geometric nonlinearity of the catenary when the wind deflection occurs, the global stiffness matrix of the catenary was deduced using the absolute nodal coordinate method, and the three-dimensional nonlinear finite element model of the catenary was established. The wind deflection of the contact wire under the static wind load of different wind speeds and different initial wind attack angles was obtained by applying wind loads. Taking the actual catenary data as an example, the calculation results show that under different wind speeds and initial attack angles, the contact wire wind deflection generated by the static wind load on the catenary is affected by its aerodynamic coefficient, and increases with the wind speed. It is also very sensitive to the wind attack angle . When the wind speed is 30 m/s, the maximum lateral wind deflection of the catenary can reach 8.3% of the daily working length of the pantograph strip, which may lead to the occurrence of pantograph scraping accidents. |
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| ISSN: | 1000-128X |