It is very complex to calculate the aerodynamic drag of high-speed train running in railway tunnel with multi -shafts. And the difficulty is to calculate the velocity of piston wind.
在高速列车空气阻力计算中，多竖井隧道的列车空气阻力计算比较复杂，其难点在于多竖井的活塞风计算。
The calculated piston wind velocity accords with the measured result on site through making a comparison with tunnel aerodynamic test data of real vehicles.
以实车的隧道空气动力学试验资料为参照进行对比计算，计算活塞风速度与实测结果较好符合。
When the piston is moved by vacuum, its velocity changes in steps, for the mass of piston pin and rod are connected in turn.
当活塞在真空作用下运动时，由于活塞销和连杆的质量是依次连接的，活塞速度呈阶梯式变化。
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