| Turnout is an important part of the rail connection, and one of the main factors what effect driving speed and security. Turnout should meet the demand of reliability, stability, comfort and a long service life and not much maintenance under the conditions of high-speed, large capacity. However, the wheel-rail interaction in turnout area is much greater than the general line, particularly with high speed train. To adapt to the development of high-speed trains, it is necessary to research contact relations of wheel-turnout. This has important implications for the safe operation of the high-speed train, reduce transportation costs, as well as the future development of the high-speed train.This paper is fixed on static and dynamic wheel/rail contact states while a wheel is over the turnout based on models of wheel with LMA standard surface and worn surface and the38turnout in use of LS-DYNA, establish the influence of train speed, direction of wheel over turnout, wheel wear and the wheel traverse.This analysis makes results as below shows:(1) The relationship between impact force of wheel-long point rail and train speed is approximately linear. The impact force is higher with higher train speed.(2) The impact happens between wheel and long point rail when wheel drives over turnout in forward direction and between wheel and wing rail in backward direction. The position of impact happens and the maximum impact forces get change with different directions.(3) The wear of wheel surface mainly effect the lateral impact force of wheel-long point rail. The force is higher with worn wheel surface.(4) The lateral impact force gets higher with vertical force getting slightly smaller when the wheel traverses to the long point rail, and the closer the wheel is to the long point rail, the higher lateral impact force is.The paper studies on high-speed wheel/rail contact with FEM method, and can significantly improve the study of wheel/turnout dynamics. |
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