Pin-on-disc friction experiments were carried out to investigate the tribocorrosion of AISI 316L in seawater, demonstrated that was dominated by formation and corrosion strain-induced-martensite with austenite.

In the realm of railroad transportation, switch sliding baseplate constitutes one most crucial components within crossings. Wear defects occurring on can give rise to issues such as delayed operation, inflexible switching, or even complete failure, thereby escalating risk train derailment. Consequently, detection wear is paramount importance for enhancing traffic efficiency and guaranteeing safety switching operations. Micro-cutting defects, which are among significant resulting from wear,...

The existing methods for thermal barrier coating (TBC) life prediction rely mainly on experience and formula derivation are inefficient inaccurate. By introducing deep learning into TBC analyses, a convolutional neural network (CNN) is used to extract the interface morphology analyze its information, which can achieve high-efficiency accurate judgment of life. In this thesis, an Adap–Alex algorithm proposed overcome problems related large training time, over-fitting, low accuracy in CNN...

To solve the problem of rail crack propagation, inadequate studies mainly use a two-dimensional (2D) model for macroscopic analysis owing to failure accurately reflecting contact status between wheel and rail. In this work, we ANSYS software establish three-dimensional (3D) wheel–rail clarify microcracks on tread. The influence number horizontal vertical cyclic loads during rail’s fatigue growth is analyzed. results suggest that as tangential increases, length increases. Using experiments...

Wheel rail rolling contact fatigue is a very common form of damage, which can lead to uneven treads, railhead nuclear etc. Therefore, ANSYS software was used establish three-dimensional wheel–rail model and analyze the effects several main characteristics, such as crack length propagation angle, on intensity factor during propagation. The findings were follows: (1) With increasing, position where propagated by mode I moved from inner edge spot outer edge. When 0.3–0.5 mm, it surface, causing...

A piezoelectric polyvinylidene fluoride film stress sensor was developed to measure the contact pressure on sheet near cutting edge in fine-blanking process. Two cases with and without cracks surface were studied. The relationship between crack width investigated using Kriging methodology at different punching speeds. maximum appeared beginning of punching, but not end V-ring indention. For case surface, one two fluctuations are observed, respectively. Using model, a fine-blanked reduced can...

To improve efficiency and accuracy of wavelet packet decomposition method modified by simple genetic algorithm (SGA), a novel algorithm, which is based on variance population entropy, proposed. And then optimized this to detect rail cracks. In the method, internal state diversity are linked up with evolutionary operations adjust crossover-mutation operators algorithm. Further, mathematical model describing fault signal established, its parameters effectively extract information. The proposed...

In this paper, a rail crack examination method based on an optimized complex evolutionary algorithm is proposed. The proposed approach has overcome the problems in which fault diagnosis of wavelet packet decomposition easily influenced by environmental factors, and traditional genetic slow convergence speed prone to prematurity. current method, control performance, diversity probability Pg added update operation. According characteristics signal, optimization function cost consider...

As the core component of railways, switch sliding baseplate has a bad operating environment, and its surface is prone to corrosion. Existing methods, including traditional ultrasonic detection, image processing, have difficulty in extracting corrosion features being applied practice. To solve above problems, Residual Neural Network 50 (ResNet50) model, deep learning introduced this paper. problems gradient explosion weak new fusion VGG-ResNet50-corrosion (VGGRES50_Corrosion), proposed First...

The electronic structure, mechanical property and thermal expansion of yttrium oxysulfide are calculated from first-principles using the theory density functional. cohesive energy indicates its thermodynamic stable nature. From bond bandgap is obtained as 2.7 eV; strong covalent bonds exist between Y O atoms intra 2D [ – ] layer in material, while relatively weak also inter S atoms. simulation, it found that bulk modulus about 119.4 GPa for elastic constants, shows anisotropy because surface...

Abstract Rails usually operate in complex environments, which makes them prone to mechanical failures. In order better diagnose crack faults, a multi-population state optimization algorithm (MPVHGA) is proposed this paper, used solve the problems of low efficiency, easy precocity, and convergence local optimal solutions traditional genetic algorithms. The fault signal detection results show that MPVHGA has advantages fast rate, high stability, no stagnation, limitation number fixed...

This study is to investigate the sleep quality of elderly in urban communities China, and explore effects music therapy on disturbances. The research has two stages. first, a cross-sectional design was utilized elderly. A stratified cluster sampling method used recruit 431 Pittsburgh Sleep Quality Index for data collection. Second, randomized controlled trial utilized. 68 with PSQI≥8 were recruited, randomly allocated intervention control group. group received only health education, while...

High temperature lubricating composites have been widely used in aerospace and other high-tech industries. In the actual application process, high oxidation resistance is a very importance parameter. this paper, BaO/TiO2-enhanced NiAl-based were prepared by vacuum hot-press sintering. The performance of at 800 °C was investigated. exhibited good sintered compactness only few pores present. Meanwhile, composite had excellent properties due to formation dense Al2O3 layer which could prevent...