捣固装置与有砟道床相互作用及捣固频率的影响研究

RESEARCH ON INTERACTION OF TAMPING MACHINE-BALLAST BED AND INFLUENCE OF TAMPING FREQUENCY

捣固频率是大型养路机械作业的关键参数,影响捣固作业动力作用及养修效果。基于压电效应研发了能适应复杂、恶劣捣固作业环境的动态冲击力传感器,自主设计了高精度、高时效的捣镐冲击力测试方法,通过现场试验研究了捣固频率对捣镐冲击力及道床力学质量状态的影响;基于离散元与多柔性体动力学耦合算法构建了捣固装置-有砟轨道精细化系统模型,通过仿真计算研究了捣固频率对道砟受力特征及运动行为的影响。结果表明:在一定范围内增大捣固频率可减小捣镐冲击力,同时提高道床力学质量状态;当捣固频率为30 Hz~40 Hz时,道砟受力相对较小,最不易发生劣化现象,且道砟运动最充分,养修效果最佳。

Tamping frequency is a critical parameter for railway maintenance machinery,which influences the dynamic interaction and maintenance effort of tamping operation.A dynamic impact force sensor was developed based on piezoelectric effect,which could adapt to the complex and harsh tamping environment.The highaccuracy and real-time test method for impact force on tamper was self-designed.On this basis,the influence of tamping frequency on the impact force on tamper and mechanical qualities of ballast bed was analyzed experimentally.Furthermore,the tamping machine-ballasted track model was constructed using the coupling of discrete element method and multi flexible body dynamics.The influence of tamping frequency on the contact force and motion behavior of ballasts was studied numerically.The results show that when the tamping frequency increases in a certain range,the impact force on tamper decreases and the mechanical qualities of ballast bed are improved significantly.Moreover,when the tamping frequency is 30 Hz~40 Hz,the contact force on ballasts is small and the movement of ballasts is the most beneficial;thus,the ballasts are hardly degraded with the best maintenance effort of tamping operation.