盾构刀盘振动切削性能有限元仿真研究

Finite element simulation of shield cutter head vibration cutting performance

针对盾构机刀盘的掘进效率问题,对振动切削原理、刀具运动轨迹与破岩机理、盾构刀盘建模、切削力学模型等方面进行了研究,将振动切削技术运用到盾构刀盘的开挖过程中,对刀盘振动切削过程中各项性能参数进行了分析与对比,提出了在刀盘圆周添加正弦激励改变转速实现振动切削的方法,利用LS-DYNA仿真软件分别进行了单把刀具的振动切削及盾构刀盘振动切削过程的数值模拟仿真。研究结果表明,切刀振动切削减阻效果优于滚刀,刀盘在振动切削条件下受力减小,产生的内能增加。

Aiming at the problem of shield machine excavation efficiency,the vibration cutting mechanism,cutter trajectory and rock breaking mechanism,shield cutter head modeling,cutting mechanics model were researched. The vibration cutting technology was applied to the excavation process of shield cutter head. Every performance parameters during the working process were analyzed and compared. The way of adding sinusoidal excitation to change the rotation speed of cutter head to realize vibration cutting was put forward. The numerical simulation software LS-DYNA was used. Both single cutter cutting and shield cutter head cutting process were tested. The results indicate that scraper is superior to hob in vibration cutting drag reduction effect. Under the condition of vibration cutting,the stress of cutter head is reducing and the internal energy is increasing.