Analysis of the Mid-high Frequency Vertical Wheel-rail Contact Forces Caused by the Short Rail Irregularities
The paper develops a wheel-rail interaction model by LS-DYNA to study the vertical wheel/rail contact force caused by the rail irregularities.The model reduces the train wheels and the train body to mass points and tracks to beams.The wheel-rail coupling is implemented with RAIL_TRAIN and RAIL TRACK in LS-DYNA.The simplified model is used to analyze the ver-tical wheel-rail contact forces caused by the short rail irregularities with different wavelength and amplitude at different speed,and to analyze the characteristics and the sensitive factors of the vertical wheel-rail force.The results show that the lower the vehicle speed,the greater the im-pact of the amplitude of the uneven wave on the vertical force of the wheel rail.At the same vehi-cle speed and uneven wavelength,the larger the amplitude of the uneven wave,the greater the vertical force,and the amplitude of the vertical force and uneven wave is approximately linearly related.At different speeds,the sensitive wavelength of track roughness varies,but the frequen-cy of the ratio of its speed to the sensitive wavelength is about 300 Hz,close to the 291.949 Hz(45th modal frequency)of the track.
short rail irregularitiesLS-DYNA modelvertical wheel-rail forcesensitive wave-lengthtrack modal frequency
NETL
NSTL
万方数据
