摘要
针对稳定作用下有砟道床的研究。采用具有真实几何形状的簇颗粒模拟道碎,建立简化缩小比1:8稳定作业下道床三维离散元模型,模拟分析不同激振频率作用下道床的宏细观动态行为。建立与轨枕模型同尺寸的试验模型,通过试验与仿真分析中轨枕的沉降量对比验证,确定试验以及构建的轨枕-道床模型的有效性与可靠性。进一步利用该试验分析道砟振动加速度道砟细观动态响应,确定在稳定过程中能量迁移的变化过程。结果表明,稳定过程中道砟的振动加速度随激振频率的增加先减小后增大在36 Hz时,道砟振动响应最明显,此时道砟的振动能量最高,在36 Hz时稳定前后能量比值最高即稳定效果最好。砟肩区域的道砟会同时出现垂向和水平运动。
This is a study of the ballast bed under stabilization.Clustered particles with real geometric shapes are used to simulate the track fragmentation,and a three-dimensional discrete element model of the track bed under the simplified reduction ratio of 1:8 is established to simulate and analyze the dynamic behavior of the track bed under different excitation frequencies.The experimental model of the same size is verified by comparison of the settlement of the sleeper in the test and simulation analysis to determine the validity and reliability of the test and the sleeper-track bed model constructed.This test is further used to analyze the meso-dynamic response of the ballast vibration acceleration ballast and determine the change process of energy migration during the stabilization process.The results show that the vibration acceleration of ballast during the stabilization process decreases first and then increases with the increase of the excitation frequency.The ballast vibration response is most obvious at 36 Hz.At this time,the ballast vibration energy is the highest,and the energy ratio before and after stabilization is the highest at 36 Hz.That is,the stabilization effect is the best.Ballasts in the shoulder area will have both vertical and horizontal movements.
作者
王桐
王立华
陈佳明
栗先增
Wang Tong;Wang Lihua;Chen Jiaming;Li Xianzeng(Faculty of Mechanical Electrical Engineering,Kunming University of Science and Technology,Kunming City,Yunnan Province 650500,China)
出处
《农业装备与车辆工程》
2021年第1期21-26,共6页
Agricultural Equipment & Vehicle Engineering
基金
国家自然科学基金资助项目(51765023)。
关键词
有砟道床
离散元法
动力学特性
振动加速度
ballasted bed
discrete element method
dynamic characteristics
vibration acceleration
