Dynamic Response Of Different Vehicles Passing Through The High-speed Turnout

With the development of high-speed railways,high-speed ballasts are built on new passenger lines and new trunk lines to improve train speed,and the speed limit and related dynamics of the switch have to be resolved.In this paper,the multi-body system dynamics software SIMPACK is used to establish different vehicle models.The dynamic cross-section simulation of the rails is used to calculate the dynamic response of different vehicles through the turnout.The SIMPACK software was used to simulate the ballast model.The No.18 movable core rail single-open ballast model was established by simulating the turnout structure by creating a variable section file describing the feature section.The model of CRH2,CRH380 A and CRH5 was established by establishing a single wheelset and establishing a bogie through a single wheelset and then building a complete vehicle model through the bogie.The wheel-rail contact geometry of the three vehicles is given.The dynamic responses of the three vehicles at the speed of 250 km/h through the ballast and the speed side of the 80 km/h through the ballast are calculated.Comparing the three wheel-rail contact points,it can be seen that the CRH2 and CRH380 A models are concentrated at the tip of the wheel after the vehicle enters the channel and the wheel is over-loaded at the tip rail and the core rail.Rail or heart center.In the CRH5 type,after the occurrence of the transfer,the position of the contact point is widely distributed in the lateral direction,and the distribution of the contact points is relatively dispersed.The maximum vertical acceleration of the CRH380 A vehicle is 0.13 m/s2 when the vehicle passes straight through the switch.The maximum vertical acceleration of the CRH2 and CRH5 vehicles is 0.17 m/s2,and the CRH380 A has a speed of 250km/h.Straightness is better than the other two cars.When the vehicle is overturned,the maximum derailment coefficient of the CRH5 is 0.76,which is close to the safety limit of 0.8,and the safety performance is poor.The maximum lateral acceleration of the CRH2 A vehicle side is 0.374 m/s2,which is significantly smaller than that of the other two vehicles.Therefore,the stability of the CRH2 A type vehicle side is better than that of the other two vehicles.