Study Of The Pressure Fluctuation And Inhibition Inside Cars When CRH2EMU Passing Through Tunnels

The pressure fluctuations inside the vehicle will be generated when the high-speed trains pass through the tunnel or meet with each other in the tunnel, which will bring impact on the passengers’eardrum, causing tinnitus, earache and other symptoms, and cause serious influence on passengers’riding comfort. With the development of the high speed train, the requirement of the passenger riding comfort is raised correspondingly. It is urgent to carry out research of the effect on the passenger riding comfort caused by the external pressure fluctuations.In this paper, a detailed analysis and research are completed to study the pressure fluctuation and inhibition inside cars when CRH2EMU passing through tunnels, with the combination of theoretical analysis, numerical simulation and real train testing. At the same time, the method of controlling the pressure fluctuation inside CRH2EMU by the fresh air ventilation device is studied. The laws of pressure variation inside and outside the cars when CRH2EMU pass through the tunnel or meet with each other in the tunnel are obtained using real train test and numerical simulation, in the case of the fresh air ventilation unit closing and opening. The mechanisms and laws of the pressure variation in the car are studied based on the linear assumption disclosure model. The laws of the pressure changing with the train speed, transverse section of the tunnel and the status of fresh air ventilation device are obtained. Pressure fluctuation inhibition effect caused by the current fresh air ventilation was studied by theoretical analysis when the CRH2EMU pass through tunnels with different cross-sectional areas at dissimilar speeds. Besides, the China’s current human comfort standards and the Japanese Shinkansen human comfort standards caused by the pressure fluctuation are compared.