Crossing aerodynamic force analysis of tarpaulin for trains

In order to solve catching wind badly and goods being soaked and damaged easily for two-piece freight tarpaulin (X-type tarpaulin), and to test the using effect of new freight tarpaulin (D-type tarpaulin), defferent loading and reinforcing projects were considered, twelve using conditions with and without cord net were confirmed, the crossing pressure waves of trains and the tensile forces of tarpaulin cord and net cord were tested by full-scale train test.The result shows that when freight car at 80~120 km·h^-1 passes by multiple unites at 200~210 km·h^-1, the maximal magnitudes of air pressure waves are 577 Pa and 715 Pa separately for multiple unites and freight car; the maximal tensile force of cord is 1 055 N, and it appears at the corner cord of X-type tarpaulin without net, which satisfies the demand of correlative standards; catching wind of two kinds of tarpaulins without net is seriously, and at the same speed, the tensile force of X-type tarpaulin against wind is about 40% greater than that down wind; cord net has an important role, and the tensile force of cord without net is 50%~80% greater than that with net.Thus, D-type tarpaulin has better using performance than X-type tarpaulin under the same instance.