Influence Of High-Speed Railway Noise Barrier On Aerodynamic And Dynamic Performance Of Train In Crosswind

With the rapid development of high-speed railway and the increase of train speed, the running safety and noise pollution of high speed train are concerned increasingly. In order to reduce the noise pollution induced by high speed train, noise barrier is widely used in modern high speed railway engineering at home and abroad. In crosswind condition, noise barrier also acts as windbreak wall. With noise barrier equipped, trains are protected to a certain extent in crosswind condition, but noise barrier changes the flow structure around the train, affects the aerodynamic performance and dynamic performance. The height of noise barrier may affect the running safety of train. Hence, it is necessary to study the influence law of noise barrier on aerodynamic and dynamic performance of high speed train, to provide some reference for the design of noise barrier and running safety.The development situations of high speed railway and noise barrier at home and abroad are summarized at first. The study on running safety in crosswind condition and noise barrier is reviewed and some disadvantages are pointed.3D aerodynamic models of high speed train running on embankment and viaduct equipped with noise barrier are built (different height noise barrier models are separately built) based on aerodynamic theory. Corresponding train dynamic models are built based on multi-body dynamics. Flow structures, aerodynamic and dynamic performances with and without noise barrier are compared, separately on embankment and viaduct. The change laws of aerodynamic and dynamic performances with the increase of noise barrier height are studied.Numerical analysis shows that:turbulences form on both sides of the carbody, and negative pressure forms in these areas. The negative pressure area formed between the windward side of carbody and noise barrier may produce side force against the wind direction. Different turbulences are formed in different cases. On embankment and viaduct, the aerodynamic force changes with the increase of noise barrier height. The change range of head car is the largest, its side force and rolling moment reduces within a certain range of height. With the increase of height, when noise barrier is low, the running safety of train on embankment gets better, when the height reaches certain value, it gets worse. On viaduct, running safety of train gets better with the increase of height. Running safety on windward track of embankment is better than on leeward track. On viaduct, train running safety indexes on leeward and windward tracks are close. With the increase of wind speed and train speed, running safety gets worse. In crosswind condition, noise barrier above3m on embankment is not advised,3.5m and above noise barrier on viaduct is not advised.