Abstract: Serious failure often occurs to the single blade edge disccutter when TBM boring in hard rock stratum. Hence, it is necessary to study the vibration characteristics of the edge disccutter during rock breaking process. Firstly, based on the analysis of the load of the edge disccutter in the rock breaking process, the loads are simplified as vertical force, axial force and overturning moment to establish an edge disccutter dynamic model. And then the dynamic simulation model of edge disccutter is established by using MATLAB/Simulink; the load history of the cutter obtained by ANSYS/Lsdyna is used as the input stimulus of the dynamic model, thus the vibration displacement response curve of each part of the edge disccutter is obtained. Finally, the effect of the stiffness on the cutter vibration is studied by changing the size of the various components in the model. The results show that: (1) When the edge disccutter with an angle of 45° is installed to break the rock in the granite stratum, the lateral vibration amplitude of the cutter ring is about 22% larger than the vertical vibration amplitude, and the maximum lateral swing angle can reach 0.406°. (2) The stiffnesses of cutter ring and bearing are the important factors that affect the lateral vibration and swing of cutter; if the stiffness of the cutter ring is doubled, the vertical, lateral and swing amplitudes of the cutter can be reduced by 26.6%, 31.5%, 31.0%, respectively; if the bearing stiffness is doubled, the vertical, lateral and swing amplitudes of cutter can be reduced by 19.5%, 14.1%, 21.7%, respectively. 

Key words: TBM, edge disc , cutter, dynamic model, vibration, stiffness, MATLAB/Simulink, ANSYS/Ls , dyna