Abstract
ABSTRACT To further clarify the galloping characteristics of the non-iced catenary positive feeder under the influence of the windbreak wall wake, this study constructs a model for the galloping of the Lanzhou-Urumqi high-speed railway catenary positive feeder in windy areas, considering the stranded convex shape based on aerodynamic theory. Using fluid-structure interaction methods, the displacement, lift, and drag coefficients were analyzed in both time and frequency domains. The results indicate that the natural frequency ratio significantly affects the positive feeder at different wind speeds. When horizontal and vertical frequencies are equal, the positive feeder experiences coupled vibration with the maximum galloping amplitude. There are significant differences in galloping amplitude under different degrees of freedom systems, with horizontal motion suppressing vertical galloping. The flow fields of smooth and stranded convex shapes show significant differences at various time points, with the stranded convex shape separating earlier, resulting in a counterclockwise long-axis elliptical trajectory, while the smooth shape shows a clockwise short-axis elliptical trajectory. This indicates that the galloping characteristics of the positive feeder are closely related to its shape, highlighting the advantages of the stranded convex shape in dynamic simulations. This study provides important theoretical support for understanding and preventing the galloping of catenary in windy areas of the Lanzhou-Urumqi high-speed railway.
Published Version
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