Study on Critical Speed of High-Speed Train Running on Bridge under Strong Crosswind

Abstract

The train-bridge aerodynamic spatial model was established, and the aerodynamic coefficients of train on bridge were calculated accordingly. The method for acquiring train critical speed under crosswind was derived by the statics, the displacement bring from springs, aerodynamic force, lateral and vertical vibrational inertia force, centrifugal force and gravitational force were considered in the derivation. The results show that the head trains aerodynamic coefficient will reach peak value around wind incidence angle, the rear trains aerodynamic coefficient varies constantly with incidence angle. Side force and lift force coefficients will get maximums when train attack angle , overturning moment coefficient absolute get maximum at . For trains overturning stability, crosswind from the inner of curve blows to the head train running on the windward line of bridge is the most dangerous situation.

Influence of air intake from existing shafts on the safety of operating trains

“…Considering the safety of operating trains and the comfort of passengers crossing tunnels, many scholars have used numerical analysis methods to study the safety of operating trains in relation to the surrounding flow field. Xiang et al 1 calculated the aerodynamic coefficient of a high-speed train passing through a double-line simply supported box girder bridge and defined and determined the allowable value of the train operation overturning coefficient. Du et al 2 established a high-speed train eight-car formation dynamics model and a spatial fluctuating crosswind load model and explored the basic characteristics of train operation under fluctuating crosswinds and the safety limits of train speed and wind speed under these conditions.…”

Numerical Analysis on the Crosswind Influence Around a Generic Train Moving on Different Bridge Configurations

“…Their research compared a train travelling in a straight path across a bridge against a train moving on a curved track. Xiang et al, [28] investigated the impacts of installing wind barriers on the bridge and how they affected the train's aerodynamic performance. As a result, the wind barriers reduce the vehicle's aerodynamic loads, notably by lowering positive pressure on the train's body's windward side and negative pressure on the roof side [27].…”