盾构机, 回转支承, 刚度, 倾覆弯矩, 赫兹接触

A finite element analysis model on a three-row roller slewing bearing was established based on the algorithm of Hertz contact theory and load equivalent model of the bearing. The stiffness behaviors subjected by the radial, axial and capsizing moment loads were investigated by using the explicit calculation. The behavior of stiffness and the load subjected on the bear was analyzed. The relationship among stiffness characteristics and load as well as dynamic stiffness under impact load was studied. The results show that the radial stiffness increases nonlinearly with load when the contact nonlinearity is considered. However, the axial stiffness decreases nonlinearly with load. The load in the axial direction has little influence on capsizing stiffness. The stress and deformation distribution of various rollers can not be described with a simple cosine function. The results can provide the guidance on the redundant actuating design of motors and synchronization control of redundant driving motors of shield during excavation in the complex geological formations. 

shield, slewing bearing, stiffness, capsizing moment, Hertz contact