Study of the Air-tightness Requirement Decisions of GTX Trains

GTX 차량기밀도 요구성능 도출에 관한 연구

Yun, Su-hwan;Cho, Yong-hyeon;Hong, Seok-woo

  • Received : 2015.01.28
  • Accepted : 2015.10.19
  • Published : 2015.12.31


When a GTX travels through a deep-level underground tunnel at a speed of 180km/h, ear-discomfort in passengers due to the pressure wave generated could be an issue due to the small cross-sectional area. Therefore, appropriate pressure-tightness values for GTX trains must be secured as a countermeasure. In this paper, a 1D numerical analysis was conducted to determine the pressure-tightness coefficient which allows a pressure change meet the criteria. The pressure transients in a tunnel and in a passenger car are predicted considering an A-line underground tunnel with a length of 37km and its operation schedule. The required pressure-tightness of the car is predicted to be three seconds and 6 seconds respectively for a single track and a double- track tunnel to prevent aural discomfort in passengers. The result of this study are expected to serve as useful information to those involved in the development of various solutions to improve air-tightness of GTX passenger cars.


GTX;Pressure-tightness;Aural discomfort;Pressure change


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Supported by : 한국철도기술연구원