Review of Micro-pressure Wave Radiating from Tunnel Portal and Pressure
Variation under Train Passage
Tatsuo MAEDA
When a train nose enters a tunnel at a high speed, a micro-pressure wave
radiates from the tunnel exit and it causes an explosive sound and an
abrupt rattling of window frames of houses near the tunnle exit.
As a train speed increases, not only micro-pressure wave by the entering
of the train nose but also micor-pressure waves by the entering of a
pantograph shield of the train, the leaving of the train nose away from
the tunnel, the passing of the train nose by branches in the tunnel and
so forth cause the rattling of window frames. In an open section, the
passing of the train nose and the train tail also generates a pressure
variation along a wayside and it also causes the rattling of window
frames.