Dynamic Analysis of Trimmer Mechanism of Segment Erector in Shield Machine

Abstract:

In order to study the thrust of cylinders in the trimmer mechanism of a segment erector under the pipe-splicing operation， the dynamic characteristics of the trimmer mechanism under yaw and pitch motions were analyzed. Firstly， the relationship between the platform angle of the simplified trimmer mechanism and the stroke of the driving cylinder was figured out. Secondly， the mechanism was modeled and simulated with Matlab Simscape to obtain the thrust values of two cylinders under the specified motion. Thirdly， the mechanism model was verified by ADAMS to carry out the dynamic simulation. Lastly， the dynamic simulation of the mechanism model under working load was carried out with ADAMS， and the maximum thrust values of the two cylinders were obtained. The results show that the maximum thrusts of the two cylinders are 8 998.47 N and 6 390.48 N respectively when the trimmer mechanism performs pitch and yaw motions as a sinusoidal function with an amplitude of 0.035 rad and an angular frequency of 1 rad·s^-1.

Key words:shield machine;segment erector;parallel mechanism;dynamic model