基于磁流变原理的TBM主机系统抗振结构设计

The Vibration Resistant Structure Design of TBM Host System Based on Magnetorheological Principle

TBM在掘进过程中振动剧烈,经常导致主机系统关键部件失效。针对TBM在掘进过程中振动剧烈问题,提出一种基于磁流变原理的TBM主机系统抗振方案。首先基于ADAMS多刚体动力学仿真平台所建立的TBM主机系统动力学模型,通过对推进油缸阻尼系数的灵敏度分析,确定磁流变阻尼器的最佳阻尼系数为2.5×10^6N·s/m,出力为400kN,此时刀盘轴向加速度幅值降低16.06%,主梁前段轴向加速度幅值降低21.75%;然后结合某工程开敞式TBM实际安装空间,确定磁流变阻尼器的安装位置;最后根据出力目标和TBM推进系统工作原理,设计了一款单筒单出杆剪切阀式磁流变阻尼器,有效的抑制了TBM主机系统关键部件的轴向振动,提高了隧道施工的安全和效率。

TBM vibrates violently during tunneling, which often leads to failure of key parts of the host system. In this paper, aiming at the severe vibration problem of TBM during tunneling, an anti-vibration scheme of TBM host system based on magnetorheological principle is proposed. Firstly, based on the dynamic model of the TBM host system established by the ADAMS multi-rigid dynamics simulation platform, the sensitivity analysis of the damping coefficient of the propulsion cylinder is analyzed. It is determined that the optimum damping coefficient of the MR damper is 2.5×10^6N·s/m, and the output is 400 kN. At this time, the axial acceleration amplitude of the cutterhead is reduced by 16.06%, and the axial acceleration amplitude of the front section of the main beam is reduced by 21.75%. Then, the installation position of the magnetorheological damper is determined by combining the actual installation space of an open type TBM in a project. Finally, according to the output target and the working principle of the TBM propulsion system, a single-tube and single-outlet shear valve type of MR damper is designed, which effectively restrains the axial vibration of the key components of the TBM host system and improves the safety and efficiency of tunnel construction.