钢轨嵌入式钢弹簧浮置板轨道减振性能分析

Analysis of Vibration Reduction Performance of Rail Embedded Steel Spring Floating Slab Track

为满足160 km/h地铁设计对轨道减振性能的要求,提出了钢轨嵌入式钢弹簧浮置板轨道结构设计方案,并研究了钢轨支承形式及轨下连续支承参数对轨道结构减振性能的影响。结果表明:钢轨支承形式(离散支承、连续支承)对钢轨和轮对振动加速度影响较小;随着轨下连续支承刚度和阻尼的降低,轮轨力和轮对加速度主频向低频移动,同时轮对及浮置板在63 Hz以上的振动减轻,但会加剧钢轨在250 Hz以上的振动;实际设计中对减振性能要求较高的地段可选用钢轨嵌入式钢弹簧浮置板轨道,并适当降低轨下连续支承刚度和阻尼来提升轨道结构的减振性能。研究成果可为160 km/h市域地铁快线中钢轨嵌入式钢弹簧浮置板轨道的选用和轨下连续支承参数的设计提供参考。

In order to meet the requirements of 160 km/h metro design for track vibration reduction performance,thedesign scheme of rail embedded steel spring floating slab track structure was proposed,and the influence of rail supportform and continuous support parameters under the rail on the vibration reduction performance of track structure wasstudied. The results show that rail support form(discrete support and continuous support)has little influence onvibration acceleration of the rail and wheel set,with the decrease of the continuous support stiffness and damping underthe rail,the main frequency of the wheel rail force and the wheel set acceleration move to the low frequency,thevibration of wheel set and floating slab above 63 Hz will be reduced,but the vibration of rail above 250 Hz will beintensified. In the actual design,the rail embedded steel spring floating slab track can be selected in the section withhigh requirements for vibration reduction performance,and the continuous support stiffness and damping under the railcan be appropriately reduced to improve the vibration reduction performance of the track structure. The research resultscan provide a reference for the selection of rail embedded steel spring floating slab track and the design of continuoussupport parameters under the rail in 160 km/h metro express.