典型轨道梁截面的高速磁浮列车-轨道梁耦合动力响应OA

In order to explore the influence of typical track beam cross-sections on the dynamic response of high-speed maglev train-track beam systems,a high-speed maglev train-track beam coupled dynamic model was established based on the UM and Simulink joint simulation platform.The effects of five typical track beam cross-sections(I-shaped,T-shaped,Π-shaped,V-shaped,box-shaped),speed,track beam damping ratio,and support stiffness on the system's dynamic response were systematically investigated.The results show that under the operating condition of 300 km·h-1,the mid-span vertical displacement,mid-span vertical acceleration of the track beam,and vertical acceleration of the train body for all cross-sections are within the specified limits,with the T-shaped and I-shaped track beam section having relatively better overall dynamic performance.As speed increases,the T-shaped beam exhibits a peak dynamic response at 350 km·h-1,while the I-shaped beam's dynamic response increases with speed.When the damping ratio is in the range of 0.03-0.08,it has little effect on track beam displacement and train body's vertical acceleration,but the mid-span vertical acceleration decreases with increasing damping ratio,with the T-shaped beam's acceleration amplitude decreasing by 0.472 m·s-2 and the I-shaped beam's acceleration amplitude decreasing by 0.264 m·s-2.When the support stiffness is in the range of 10-1 000 MN·m-1,the increase of support stiffness reduces the vertical acceleration of the track beam but can increase the train body's vertical acceleration to some extent.This study can provide theoretical support for the selection of track beam cross-sections and the design of structural parameters for high-speed maglev.