To connect the photovoltaic (PV) power generation to the traction power supply system for effective utilization and take into account the improvement of the power quality of the traction power supply system and the recycling of the regenerative braking energy of the train, a coordinated control meth...

The deformation of the tunnel surrounding rock and the thickness of the loose zone are important considerations for tunnel structure design and an important reference basis for safe operation. However, the existing identification methods of the loose zone and measurement methods of tunnel surroundin...

The tunnel pressure wave excitation generated when the same train passes through the same tunnel repeatedly has the characteristics of similar forms, variable scales, and variable amplitudes. Since the current control strategies do not take into account this fixed form, an iterative learning control...

In order to reveal the effect of ventilation parameters and ground temperature on freezing damage in tunnels in cold regions, the three-dimensional unsteady numerical heat transfer control equations for the tunnel surrounding rock, lining, and airflow are developed based on heat transfer theory. The...

To explore the aerodynamic load characteristics of trains under side wind environments, the model of the longitudinal and lateral components of wind velocity at a point moving with the train for any wind angle was set up. The computational method of aerodynamic loads of the train exposed to wind vel...

In the multi-objective aerodynamic optimization design of high-speed trains, the optimization efficiency of the surrogate model established using the traditional infill criterion is low when the initial sample points are few. To this end, a hybrid infill criterion (HIC) was proposed by combining the...

With the increase in the train speed, the contribution of the quadrupole noise source to the aerodynamic noise of the train increases. When the running speed of the high-speed maglev train reaches 600 km/h, it is necessary to consider the influence of the quadrupole noise source on the aerodynamic n...

In order to solve the local overheating and the energy waste of radiant floor heating systems in railway stations on the plateau with intensive solar radiation, a railway station on the plateau was studied, and a partition heating scheme of the radiant floor system was proposed according to the sola...

In order to accurately recognize the readings of digital instruments in the actual scene of substations, intelligently control substation security, and promote its intelligent development, the digital instruments in the substation are taken as the research object, and in view of real-time and accura...

In order to investigate whether longitudinal ventilation can effectively control the diffusion of leaked hydrogen in tunnels and reduce the overpressure hazards of flammable hydrogen clouds, a square tunnel with a length of 100 m was studied. The hydrogen leakage and diffusion process in the tunnel ...

In order to study the effect of the temperature on the emission of volatile organic compounds (VOCs) from typical non-metallic materials (heavy anti-corrosion coatings, floor covering, and glassfiber reinforced plastics) for railway passenger trains, tests were carried out to analyze the emission la...

High-speed trains carry a large number of passengers and have a well-developed transportation network. However, the closed compartment environment is likely to cause the accumulation of pollutants. In order to improve the comfort and safety of the train, a full-scale compartment ventilation model of...

Double-chimney structure has aerodynamic interference effects under natural wind, which will induce large wind-induced vibrations, further threatening the safety of the structure. Reasonable calculation and prediction of wind-induced vibration responses are essential for wind resistance design of do...

To solve the design waste and idle operation of ventilation systems in urban tunnels caused by the continuous update of traffic vehicles, the influence of base emission factor update on tunnel fresh-air demand was studied, and two calculation methods of base emission factor in response to vehicle up...

The prediction of machining quality is a vital component of intelligent manufacturing and a prerequisite for achieving quality closed-loop control, playing an extremely important role in promoting the practical application of intelligent manufacturing systems. A brief review of the history of machin...

Since the weak fault feature of train axle-box bearings is difficult to be extracted in a wide frequency band, this paper proposes a weighted combined improved envelope spectrum (WCIES) for fault diagnosis based on the second-order cyclostationary of bearing fault signals. First, the fine demodulati...

A multi-fault feature extraction and matching method guided by variational mode decomposition (VMD) was proposed to address the difficulty in identifying and diagnosing composite faults in train wheelset bearing systems. Firstly, in order to avoid the pre-defined mode number relying on prior knowled...

In-situ tool-condition monitoring system based on machine vision realizes tool wear measurement and condition assessment without removing the tool. However, the system deployment parameters that are closely related to the quality of the tool image are rarely studied. To this end, a polynomial regres...

In order to reveal the reasons for the great difference of cracks in the lifting lugs at different positions of the under-chassis equipment of CRH380AL high-speed EMU, full-scale test on vibration acceleration and aerodynamic load are carried out. The dynamics model of the large-scale system with mu...

In order to obtain the pure wear acoustic emission of diamond-coated mechanical seal, the denoising method based on empirical wavelet transform (EWT) and Kullback-Leibler divergence (KLD) was proposed. Firstly, filter bank was calculated with empirical wavelet transform on acquired acoustic emission...

To solve the problem of limited generalization ability of fault diagnosis model caused by the lack of sufficient fault data characteristics of single railway high-speed train bogie, and to realize the diagnosis of bogie faults of multiple railway high-speed trains, a global bogie fault diagnosis met...

Traditional machine learning methods (e.g., hand-coded feature extraction) are sensitive to light sources, equipment installation errors and other factors, which require repeated debugging and experiments and make it difficult to achieve automatic detection in large-scale production. Considering the...

To enhance the robustness of axle-box bearing fault detection under complex interference noise, the envelope spectrum construction method for axle-box bearing fault diagnosis is investigated by cyclic spectral analysis and considering the distribution difference of bearing fault information and thre...

In order to realise the real-time detection of wheel out-of-roundness (OOR) for high-speed trains, the spectral characteristics and mapping relationship between the axlebox high-frequency vibration and the wheel OOR are studied. The amplitude and order of the wheel OOR are identified using the frequ...

The variable operating speed of mechanical equipment bearings leads to blurred spectrum of vibration monitoring signals, which to some extent affects the accuracy of bearing fault diagnosis. The current tacholess order tracking technology works well when the rotational speed fluctuation is small and...

The operating conditions of axle-box bearings of urban rail transit trains are complex and time-varying, and they often suffer from random external interferences. Correspondingly, the monitoring data of axle-box bearings contain a great amount of measurement noise and even abnormal data, thereby lim...