A study on critical speed of high-speed train using measured wheel profiles

초록

This study describes the critical speed of KTX-sancheon, the Korean high-speed train, using measured wheel profiles. The critical speed of KTX-sancheon power car was analyzed using VAMPIRE[1], the railroad dynamic software. In this analysis two types of wheel/rail contact data were investigated. One is contact data from linear creep model[2] and the other is data from measured wheel profiles.<br>Lots of wheel profiles of KTX and KTX-sancheon were measured using CALIPRI[3] as mileage increased. The mileage was between 0km and 335,500km. The wheel profile of KTX and KTX-sancheon is XP55(1/20) accoriding to French standard NF F01-115. The equivalent conicity was calculated using measured wheel profiles and new UIC60-20 rail and displayed in Fig. 1(a). The conicity of new wheel is 0.052 and it was according to lateral shift. The worn wheel conicity of 335,500km is about 0.25. The conicity of 5mm lateral shift is displayed in Fig. 1(b). It shows that the conicity increases according to mileage.