Adaptability of existing high-speed railway vibration damping measures to curved rail

Vibration-reducing ballastless tracks can solve the problem of vibration and noise caused by high-speed train operation to a certain extent. The existing literature takes the straight track as the research object, and from the perspective of controlling the vibration of the track, the reasonable value of the orbital structure parameters is quantitatively or qualitatively analyzed from multiple angles. However, due to the difference in vibration between the straight track and the curved track, whether the lateral vibration of the curved track is included in the scope of vibration reduction, and the adaptability of the vibration reduction parameters of the linear track to the curved track is still unclear. The relevant research is urgently needed. In this paper, through the joint simulation of multibody system dynamics and finite element, a vehicle-track rigid-soft coupling model of typical curved lots was established, and the vibration differences of the lower structure of the track of straight segment, straight slow lot, slow circle lot and circular curve section were compared. The conclusions are drawn as follows. Under the same uneven excitation, the derailment coefficient of the curve lot is 0.046 greater than the 0.012 of the straight lot. As the train enters the curved track from the straight line, the vertical vibration acceleration stage of the track plate decreases by 2.19 dB at 50 Hz, while the lateral vibration acceleration stage increases by 0.97 dB. After taking the same vibration damping measures, there is a big difference between the vibration damping effect of the straight lot and the curve lot, compared with the straight line lot, the vibration response distance of the curve lot track plate has more margin. The difference between the acceleration stage of the linear lot track plate and the base plate is 14.45 dB, while the curve lot is increased to 17.41 dB, and the subsequent design for track vibration reduction should be analyzed in the track model of the lot. © 2023, Central South University Press. All rights reserved.