Multi-degree-of-freedom coupling dynamic characteristic of TBM disc cutter under shock excitation

Abstract

When the tunneling boring machine (TBM) cutterhead tunnels, the excessive vibration and damage are a severe engineering problem, thereby the anti-vibration design is a key technology in the disc cutter system. The structure of disc cutter contains many joint interfaces among cutter ring, cutter body, bearings and cutter shaft. On account of the coupling for dynamic contact and the transfer path among joint interface, mechanical behavior of disc cutter becomes extremely complex under the impact of heavy-duty, which puts forward higher requirements for disc cutter design. A multi-degree-of-freedom coupling dynamic model, which contains a cutter ring, a cutter body, two bearings and cutter shaft, is established, considering the external stochastic excitations, bearing nonlinear contact force, multidirectional mutual coupling vibration, etc. Based on the parameters of an actual project and the strong impact external excitations, the modal properties and dynamic responses are analyzed, as well as the cutter shaft and bearings' loads and load transmission law are obtained. Numerical results indicate the maximum radial and axial cutter ring amplitudes of dynamic responses are 0.568 mm and 0.112 mm; the maximum radial and axial vibration velocities are 41.1 mm/s and 38.9 mm/s; the maximum radial and axial vibration accelerations are 94.7 m/s 2 and 58.6 m/s 2 ; the maximum swing angle and angular velocity of cutter ring are 0.007° and 0.0074 rad/s, respectively. Finally, the maximum load of bearing roller is 40.3 kN. The proposed research lays a foundation for structure optimization design of disc cutter and cutter base, as well as model selection, modification and fatigue life of the cutter bearing.

A New System to Evaluate Comprehensive Performance of Hard-Rock Tunnel Boring Machine Cutterheads

“…The Liaoning Northwest Water Diversion Tunnel Project is located in northern Shenyang. This area is drought prone, and the Liaoning Diversion Project was developed to address water problems in the region [26]. The main physical parameters of the two kinds of rock strata are given in Table 1.…”

“…This algorithm provides an iterative method that simulates mass interactions, and it moves through a multidimensional search space under the influence of gravitation. Huo et al [23][24][25][26] studied on the vibration of the TBM cutter head and the fatigue damage of the cutter head under the multi space load. Tao et al [27] described a hybrid approach that integrates all kinds of investigation methods in real and virtual environments to evaluate the sitting posture comfort in a human-vehicle system.…”

An Early-Warning System to Validate the Soil Profile during TBM Tunnelling

“…Zhang et al [29] established a dynamic model for a TBM revolving system, considering the time-dependent mesh stiffness in a MFC. Sun et al [30] and Huo et al [31,32] set multiple dynamic models for a TBM cutter head system in hard rocks considering the external stochastic excitations, time-varying meshing stiffness, transmission errors, and so forth. Liu et al [33] developed a movable microseismic monitoring system to characterize the rockburst type.…”

Dynamic Characteristics Analysis with Multi-Directional Coupling in a TBM Mainframe

“…Sun et al [18,19] and Li et al [20] established a coupling nonlinear dynamic model of a cutterhead system to analyze the dynamic characteristics of the cutterhead. Huo et al [21,22] established multi-degreeof-freedom coupling dynamic models for the disc cutter and cutter system and revealed the dynamic characteristics of the disc cutter and cutter system. In addition, Huo et al [23,24] presented multi-coupling dynamic models for the TBM main drive and supporting systems and carried out a field strain test to verify the models.…”