The vertical adjustment system with angle closed loop control for TBM

In this paper, a high precision vertical adjustment hydraulic system is designed to ensure the displacement control accuracy of the torque cylinders. The position relationship between the pitch angle and the torque cylinder in TBM vertical adjustment system is calculated, and it is linear with the torque cylinders displacement when the pitch angle is small. With the purpose of finding a synchronous control strategy, the vertical adjustment with angle closed loop and the existing system were respectively established in AMESim, The response of the toqure cylinders displacement and the pitch angle to the step signal indicate that the displacement deviation of the left and right torque cylinder is reduced, and the pitch angle error is smaller.