Citation

Kim JS, Kim NP. Eng. Failure Anal. 2007; 14(1): 63-72.

Copyright

(Copyright © 2007, European Structural Integrity Society, Publisher Elsevier Publishing)

DOI

10.1016/j.engfailanal.2005.12.008

PMID

unavailable

Abstract

When a train runs at a high speed over a curve, the generated centrifugal force adversely affects ride comfort by pushing passengers toward the outside of the curve. The tilting train has been developed to minimize lateral forces acting on passengers by tilting the body toward the inside of the curve. A tilting bogie is a key component of the tilting train. A bogie of a railway vehicle has to sustain the weight of the carbody and control the wheelsets in the correct alignment to meet the conflicting requirements of stable running on straight track and good curving performance with low track wear. In the tilting train, a carbody tilting system is installed within the bogie. The carbody tilting system is composed of a tilting bolster, a tilting actuator and a tilting linkage. The carbody is seated on the bolster through the air-spring. The carbody is tilted by the roll moment generated by means of a tilting actuator located between the bogie frame and the tilting bolster.

This study was performed to assess the structural safety of a bolster frame that is applied to the bogie system of Korean tilting train. In order to achieve this goal, firstly, loading conditions imposed on the bolster frame were investigated. Based on the international standard and dynamic analysis, the loading conditions were derived. In this study, the dynamic load cases that consider the carbody tilting effect were established. The structural safety of the bolster frame was evaluated by static test under these static loads and the fatigue strength was assessed using Goodman diagram. From the assessment, the bolster frame has satisfied the structural safety. In addition, fatigue test was carried out up to 10 x 106 cycles under tilting load condition established in this study. The inspection of fatigue crack using NDT method was conducted at 6 x 106 and 10 x 106 cycle.