Based on the damage evolution equation of bearing steel, a user subroutine was developed to simulate fatigue behavior TBM main under condition low speed and heavy load. In addition, law in time domain space studied. Then, nonlinear spring element introduced interaction between roller raceway, vibration response after studied using transient dynamic method. The research shows that risk raceway i...

Abstract Robotic splicing of steel arches is a challenging task that necessary to realize the grasping and docking in limited space. Steel often have mass more than 200 kg length 4 m. Owing large volume high requirements for accurately positioning splicing, it difficult general manipulator meet stiffness requirements. To enhance structural arch manipulator, single-degree-of-freedom (DOF) closed...

This paper aims to estimate the distribution and magnitude of the excavation damaged zone (EDZ) caused by the tunnel boring machine (TBM) through dynamic three-dimensional large deformation finite element analysis. Coupled EulerianLagrangian (CEL) analysis was used to consider the large deformation behavior during TBM excavation. The analysis model was verified based on estimations reported in ...

Over the last several decades mechanical mining machines have developed into highly productive, light weight, mobile machines which are able to economically mine many soft rock ore bodies. Due to the utilization of disc cutters Tunnel Boring Machines, with great mass and limited mobility, have developed the ability to cut the hardest rocks at high production rates. Technological advancements ha...

the occurrence of chatter vibrations in boring operation has a great influence in improving workpiece dimensional accuracy, surface quality and production efficiency. in this paper instability analysis of machining process is presented by dynamic model of boring machine. this model, which consists of machine tool’s structure, is provided by finite element method and ansys software. the model is...

TerraSAR-X satellite SAR (Synthetic Aperture Radar) scenes have been analysed using Persistent Scatter Interferometry (PSI) approach to monitor a tunnelling process in Düsseldorf, Germany. The aim of this work is to detect the deformation of ground surface and structures above the tunnelling line during the tunnel excavation. In this study, 5 the PSI approach integrated in the open source softw...