Abstract
When a high-speed train enters a tunnel, a compression wave is generated in front of the train. This compression wave propagates to the tunnel exit and spouts as a micro pressure wave, which causes a blast sound. To solve the noise pollution at the tunnel exit, we have to know how the compression wave propagates in the tunnel. Because it is very difficult to collect data from a real tunnel, we have to use a railway tunnel simulator to investigate the mechanism of the propagating compression wave. To accomplish the railway tunnel simulator, a fast opening gate valve was developed. In this present paper we have analyzed the performance of the fast opening gate valve by using a super high-speed video camera. The results show that the opening time of the gate valve decreases when the initial pressure in the actuating chamber increases. And the relation between the initial pressure in the actuating chamber(or opening time) and the characteristics of the compression wave such as the maximum pressure gradient was made clear.
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