Through the honeycomb damage that is appear in unballasted track will affect the safe operation of high-speed train, accurate detection of honeycomb damage is very important. Impact-echo method is a non-destructive testing method. Based on the principle of impact echo, author using the finite element software ANSYS LS-DYNA3D to simulate the impact-echo, testing and verifying the feasibility and accuracy of impact-echo method in discerning unballasted track damage. By analyzing the calculated result of honeycomb damage in slab track and double-block ballastless track, it is shows that: according to back calculate the depth of damage base on the peak value in acceleration spectrum graph, the honeycomb damage in different depth can be accurate located.

Inspection work on power transmission line is an important link in the safe production of electric power, inspection staff training has always been attention of the power industry researchers. In order to improve learners training effect, we put forward a new form of teaching to inspect transmission lines with combined with simulation training. This paper analyzes the transmission line inspection requirements and the corresponding functions of the simulation system and the corresponding, then introduces the system structure, the abstract simulation training process, finally give the system application examples. Application results show that the 3D simulation training system of the power transmission line inspection can effectively guarantee training effect on the transmission line inspection technology.

The pier longitudinal horizontal stiffness is the key technical parameter of rigid frame bridge and the continuous welded rail. Both the distribution of longitudinal force and the relative displacement between the beam and rail are rely on the longitudinal horizontal stiffness of the pier. This passage takes the symmetrical arrangement of different span rigid frame bridge in ballast track as an example to study the value of pier top longitudinal horizontal rigidity, using the finite element method. The analysis show that when the amplitude of rail temperature variation is less than 50 °C and the nominal temperature span within a certain range, the minimum value of pier longitudinal horizontal rigidity depends largely on the braking conditions. However, as the further increasing of the span, the pier longitudinal horizontal rigidity is restricted by the expansion conditions. Therefore, the small resistance fastening system should be taken into consideration. Especially, if the temperature of rail reaches above 50°C, laying rail expansion adjuster is needed in order to satisfy the requirement of the continuous welded rail temperature on bridge.

First a 3D model for frictional roller of endless-rope winch was established with Pro/E software. And then the model was imported into finite element software named ANSYS Workbench, by which, the stress and deformation distribution of frictional roller could be acquired after meshing and loading. Next by making use of the Design Explorer module of ANSYS Workbench software, the paper analyzed the sensitivity of the major structure parameters which influence the roller strength. On the foundation of sensitivity analysis, these parameters were optimized to make the structure of the frictional roller more reasonable and meeting the design requirements.

Gas monitoring of roadway excavation of coal mine is of utmost importance, to monitor the gas distribution more effectively, the following works were carried out. Taking a rectangular tunnel as research object, the distribution law of the gas was simulated by using commercial software FLUENT, a simulation test bed was built according to similarity theory and sensors arranged according to simulation results to form a sensor network, BP neural network was adopted in process of acquired data. The results show that it is of accuracy and feasibility to provide theoretical basis for arrangement of the network sensor by simulation results of gas distribution. By using a BP network, the sensor network can be used to predict the gas concentrations accurately.