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This paper deals with the control system of the segment erector of a shield tunneling machine and reducing the steady-state error and impact force during the positioning process. A segment erector with six degrees of freedom driven by electro-hydraulic system is designed, and the segment erecting process is introduced. The kinematics and dynamics models, as well as the mathematical model of the electro-hydraulic...
This paper presents a novel signal analysis method by combining ICA and EEMD algorithms, which can be used for decomposition and feature extraction of non-stationary random signals. The features of ICA and EEMD algorithm were analyzed. Simulations verified the feasibility of combining the two algorithms. The ICA and EEMD combined algorithm has good validity and practicality in the impact acceleration...
Penetration acceleration signal is a typical non-stationary signal, which cannot be effectively and accurately analyzed by traditional time-frequency analysis methods. EEMD algorithm improved based on the core algorithm EMD of Hilbert-Huang transform, effectively solved the mode aliasing problem of EMD algorithm and adaptive analyze the non-stationary random signals. However, EEMD algorithm also has...
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