Abstract
Theoretical study has been conducted to clarify pressure characteristics of KTX(Korea Tram express) in tunnel The severe pressure change in tunnel may give rise to the ear-discomfort for passenger and fatigue for car body The external and internal pressure of rolling stock have been measured by using the running test with atmospheric pressure sensors and portable data acquisition system in high speed tram In this study, the tunnels from 200m to 4000m in length have been chosen for the Investigation of tunnel length effects We found that there are similar patterns of external pressure change for each critical tunnel length The critical tunnel lengths are governed by tram speed, tram length and some velocity And, the patterns of pressure wave m tunnel are classified into eight groupsbr/
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