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A Novel Model for Describing Rail Weld Irregularities and Predicting Wheel-Rail Forces Using a Machine Learning Approach

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 555-577页

作者： Linlin Sun Zihui Wang Shukun Cui Ziquan Yan Weiping Hu Qingchun Meng State Key Laboratory of High-Speed Railway Track System China Academy of Railway Sciences Corporation LimitedBeijing100081China Railway Engineering Research Institute China Academy of Railway Sciences Corporation LimitedBeijing100081China School of Aeronautic Science and Engineering Beihang UniversityBeijing100191China

Rail weld irregularities are one of the primary excitation sources for vehicle-track interaction dynamics in modern high-speed *** can cause significant wheel-rail dynamic interactions,leading to wheel-rail noise,component damage,and *** researchers have employed the vehicle-track interaction dynamic model to study the dynamic interactions between wheel and rail induced by rail weld geometry ***,the cosine wave model used to simulate rail weld irregularities mainly focuses on the maximum value and neglects the geometric *** this study,novel theoretical models were developed for three categories of rail weld irregularities,based on measurements of the high-speed railway from Beijing to *** vertical dynamic forces in the time and frequency domains were compared under different running *** forces generated by the rail weld irregularities that were measured and modeled,respectively,were compared to validate the accuracy of the proposed ***,based on the numerical study,the impact force due to rail weld irrregularity is modeled using an Artificial Neural Network(ANN),and the optimum combination of parameters for this model is *** results showed that the proposed model provided a more accurate wheel/rail dynamic evaluation caused by rail weld irregularities than that established in the *** ANN model used in this paper can effectively predict the impact force due to rail weld irrregularity while reducing the computation time.

关键词： Rail weld irregularity high-speed railway vehicle-track coupled dynamics wheel/rail dynamic vertical force artificial neural networks

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Glacier lake outburst floods(GLOF)susceptibility in the Boqu Basin in Tibetan Plateau

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Journal of Mountain Science 2025年第2期22卷 505-520页

作者： XU Shuai SU Peidong LIANG Yu LI Yougui LONG Wei XU Mingshan School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China Survey and Design corporation of Power china Chengdu Engineering corporation limited Chengdu 611130China

The glacial lake in the Boqu Basin in Tibetan Plateau has changed significantly in recent years due to global warming,seriously affecting the natural and social environments in downstream *** obtained the change characteristics of glacial lakes by analyzing remote sensing images and evaluated the outburst floods susceptibility of glacial lakes in the Boqu Basin by combining fuzzy mathematics and random forest *** empirical formula for glacial lake hazard evaluation was established based on a fuzzy comprehensive *** confusion matrix were used to assess the evaluation effect of each *** conclusions were as follows:(1)Under the influence of climate warming,glaciers are retreating further from the glacial lakes,and the size of glaciers that can impact these lakes is *** conditions,such as steep slopes around the lakes,have replaced glacier tongues as the primary factors threatening the susceptibility of the glacial lakes;(2)Among the three evaluation methods,the empirical formula offers high calculation accuracy and is the most convenient to use,which provides an accuracy rate of 85.71%in susceptibility evaluation of the Boqu Basin glacial lake and can be applied to other areas in the rapid evaluation of the susceptibility of glacial lakes;(3)The impact analysis of the collapse shows that the collapse of the Galongco fault would cause large economic losses.

关键词： Glacial lake change Hazard assessment Fuzzy comprehensive evaluation Random forest

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Emerging trends in the selective production of value-added aromatics

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Science china Chemistry 2025年第1期68卷 15-20页

作者： Yuchao Wu Houliang Dai Weisheng Yang Yaxing Li Lichen Liu Petrochemical Research Institute Company limited China National Petroleum CorporationBeijing 102206China Engineering Research Center of Advanced Rare Earth Materials Department of ChemistryTsinghua UniversityBeijing 100084China

1 Introduction Aromatics(mainly benzene,toluene,and xylenes,BTX)are essential intermediates in the chemical *** are employed in the synthesis of a broad spectrum of chemicals and materials,e.g.,various polymers,plastics,resins,solvents,dyes,pharmaceuticals^([1]).The manufacturing pathway of BTX mainly includes petroleum reforming of naphtha,coal-to-aromatics,methanol-to-aromatics^([2]).

关键词： reforming methanol resins

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Research progress on the environmental risk assessment and remediation technologies of heavy metal pollution in agricultural soil

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Journal of Environmental Sciences 2025年第3期149卷 1-20页

作者： Xurui Mai Jing Tang Juexuan Tang Xinyue Zhu Zhenhao Yang Xi Liu Xiaojie Zhuang Guang Feng Lin Tang College of Environmental Science and Engineering Hunan UniversityChangsha 410082China Key Laboratory of Environmental Biology and Pollution Control(Hunan University) Ministry of EducationChangsha 410082China Power china Zhongnan Engineering corporation limited Changsha 410014China

Controlling heavy metal pollution in agricultural soil has been a significant *** heavy metals seriously threaten the surrounding ecological environment and human *** effective assessment and remediation of heavy metals in agricultural soils are *** two aspects support each other,forming a close and complete decisionmaking ***,this review systematically summarizes the distribution characteristics of soil heavy metal pollution,the correlation between soil and crop heavy metal contents,the presence pattern and migration and transformation mode of heavy metals in the soil-crop *** advantages and disadvantages of the risk evaluation tools and models of heavy metal pollution in farmland are further outlined,which provides important guidance for an in-depth understanding of the characteristics of heavymetal pollution in farmland soils and the assessment of the environmental *** remediation strategies involve multiple physical,chemical,biological and even combined technologies,and this paper compares the potential and effect of the above current remediation technologies in heavy metal polluted farmland ***,the main problems and possible research directions of future heavy metal risk assessment and remediation technologies in agricultural soils are *** review provides new ideas for effective assessment and selection of remediation technologies based on the characterization of soil heavy metals.

关键词： Source Migration transformation Risk assessment Remediation Heavy metals Agricultural soils

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Real-Time Facial Expression Recognition on Res-MobileNetV3

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china Communications 2025年第03期 54-64页

作者： Li Beibei Zhu Jiansheng Li Suwen Dai Linlin Yan Zhiyuan Ma Liangde Postgraduate Department China Academy of Railway Sciences Institute of Computing Technologies China Academy of Railway Sciences Corporation Limited Department of Science Technology and Information CHINA RAILWAY Standards & Metrology Research Institute China Academy of Railway Sciences Corporation Limited Railway Infrastructure Inspection Center China Railway

Artificial intelligence, such as deep learning technology, has advanced the study of facial expression recognition since facial expression carries rich emotional information and is significant for many naturalistic situations. To pursue a high facial expression recognition accuracy, the network model of deep learning is generally designed to be very deep while the model's real-time performance is typically constrained and limited. With MobileNetV3,a lightweight model with a good accuracy, a further study is conducted by adding a basic ResNet module to each of its existing modules and an SSH(Single Stage Headless Face Detector) context module to expand the model's perceptual field. In this article, the enhanced model named Res-MobileNetV3, could alleviate the subpar of real-time performance and compress the size of large network models, which can process information at a rate of up to 33 frames per second. Although the improved model has been verified to be slightly inferior to the current state-of-the-art method in aspect of accuracy rate on the publically available face expression datasets, it can bring a good balance on accuracy, real-time performance, model size and model complexity in practical applications.

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Assessing ground stability of a vertical backfilled stope considering creep behaviors of surrounding rocks

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Journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 187-199页

作者： Ruofan Wang Lang Liu Mengbo Zhu Huafu Qiu Bingbing Tu Huisheng Qu Hao Cui Faculty of Energy Engineering Xi’an University of Science and TechnologyXi’an710054China Key Laboratory of Western Mines and Hazards Prevention Ministry of Education of ChinaXi’an710054China Faculty of Science Xi’an University of Science and TechnologyXi’an710054China Powerchina Huadong Engineering corporation limited Hangzhou311122China

Backfill is often employed in mining operations for ground support,with its positive impact on ground stability acknowledged in many underground ***,existing studies have predominantly focused only on the stress development within the backfill material,leaving the influence of stope backfilling on stress distribution in surrounding rock mass and ground stability largely ***,this paper presents numerical models in FLAC3D to investigate,for the first time,the time-dependent stress redistribution around a vertical backfilled stope and its implications on ground stability,considering the creep of surrounding rock *** the Soft Soil constitutive model,the compressibility of backfill under large pressure was *** is found that the creep deformation of rock mass exercises compression on backfill and results in a less void ratio and increased modulus for fill *** compacted backfill conversely influenced the stress distribution and ground stability of rock mass which was a combined effect of wall creep and compressibility of *** the increase of time or/and creep deformation,the minimum principal stress in the rocks surrounding the backfilled stope increased towards the pre-mining stress state,while the deviatoric stress reduces leading to an increased factor of safety and improved ground *** improvement effect of backfill on ground stability increased with the increase of mine depth and stope height,while it is also more pronounced for the narrow stope,the backfill with a smaller compression index,and the soft rocks with a smaller viscosity ***,the results emphasize the importance of minimizing empty time and backfilling extracted stope as soon as possible for ground *** of filling gap height enhances the local stability around the roof of stope.

关键词： Ground stability Time dependency Creep Surrounding rocks Backfilled stope

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Subsection cooling system of hot rolling silicon steel and its industrial application

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Journal of Iron and Steel Research International 2025年第1期32卷 159-170页

作者： Qiu-na Wang Ji-quan Sun Li-po Yang Hai-shen Wang Li-jie Dong Jie-ming Li Zhen-yang Zhi Yan-wen Bi National Engineering Research Center of Flat Rolling Equipment University of Science and Technology BeijingBeijing100083China Hot Rolling Department of Qian’an Iron and Steel corporation Shougang Company LimitedTangshan064404HebeiChina National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao066004HebeiChina

An online subsection cooling method for hot rolling silicon steel was designed to achieve local adjustment of transverse roll ***,it was able to meet the requirements of edge drop of the strip by using the features of online thermal ***,after the new subsection spray beam was installed at the exit of mill,the special local cooling rules were analyzed for altering the thermal crown of roll according to rolling process ***,the dynamic impact of subsection cooling on the local thermal crown could just be obtained according to the measured ***,the heat transfer coefficient was determined by different subsection cooling curves under varied rolling ***,the rolling rhythm and variable conditions were important dynamic factors of transient roll temperature in practical rolling ***,real-time calculation and presetting of the thermal crown were carried out to maximize special requirements of load roll gap on local strip *** this new method,the transient temperature and the thermal crown of roll could be quantitatively controlled *** the practical results showed that the predicted temperature was able to match the measured value by more than 95%.Meanwhile,the adjustable range of thermal crown increased by more than 2.5 ***,the qualification rate of strip edge crown has increased from the original 30%to over 70%.

关键词： Subsection cooling Thermal roll crown Multi-parameter coupling Hot rolling Silicon steel

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Mechanical Properties of Railway High-strength Manufactured Sand Concrete: Typical Lithology, Stone Powder Content and Strength Grade

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 194-203页

作者： WANG Zhen LI Huajian HUANG Fali YANG Zhiqiang WEN Jiaxin SHI Henan Railway Engineering Research Institute China Academy of Railway Science Corporation LimitedBeijing 100081China State Key Laboratory for Track Technology of High-Speed Railway Beijing 100081China

In order to achieve the large-scale application of manufactured sand in railway high-strength concrete structure,a series of high-strength manufactured sand concrete(HMC)are prepared by taking the manufactured sand lithology(tuff,limestone,basalt,granite),stone powder content(0,5%,10%,15%)and concrete strength grade(C60,C80,C100)as *** evolution of mechanical properties of HMC and the correlation between cubic compressive strength and other mechanical properties are *** to river sand,manufactured sand enhances the cubic compressive strength,axial compressive strength and elastic modulus of concrete,while its potential microcracks weaken the flexural strength and splitting tensile strength of *** powder content displays both positive and negative effects on mechanical properties of HMC,and the stone powder content is suggested to be less than 10%.The empirical formulas between cubic compressive strength and other mechanical properties are proposed.

关键词： manufactured sand concrete railway mechanical property lithology stone powder content

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Parameter influence analysis and optimization of wheel–rail creepage characteristics in high-speed railway curves

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Railway Sciences 2025年第1期4卷 37-51页

作者： Bolun An Jiapeng Liu Guang Yang Feng shou Liu Tong Shi Ming Zhai Metals and Chemistry Research Institute China Academy of Railway Sciences Corporation LimitedBeijingChina

Purpose–To investigate the influence of vehicle operation speed,curve geometry parameters and rail profile parameters on wheel–rail creepage in high-speed railway curves and propose a multi-parameter coordinated optimization strategy to reduce wheel–rail contact fatigue ***/methodology/approach–Taking a small-radius curve of a high-speed railway as the research object,field measurements were conducted to obtain track parameters and wheel–rail profiles.A coupled vehicle-track dynamics model was *** numerical experiments were designed using the Latin Hypercube Sampling method to extract wheel-rail creepage indicators and construct a parameter-creepage response surface ***–Key service parameters affecting wheel–rail creepage were identified,including the matching relationship between curve geometry and vehicle speed and rail profile *** influence patterns of various parameters on wheel–rail creepage were revealed through response surface analysis,leading to the establishment of parameter optimization ***/value–This study presents the systematic investigation of wheel–rail creepage characteristics under multi-parameter coupling in high-speed railway curves.A response surface-based parameter-creepage relationship model was established,and a multi-parameter coordinated optimization strategy was *** research findings provide theoretical guidance for controlling wheel–rail contact fatigue damage and optimizing wheel–rail profiles in high-speed railway curves.

关键词： High-speed railway Curve track Wheel-rail creepage Parameter analysis Response surface methodology Optimization design

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Research on the rapid diagnosis method for hunting of high-speed trains

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Railway Sciences 2025年第1期4卷 1-21页

作者： Wanru Xie Yixin Zhao Gang Zhao Fei Yang Zilong Wei Jinzhao Liu Infrastructure Inspection Research Institute China Academy of Railway Sciences Corporation LimitedBeijingChina Infrastructure Inspection Center China Railway CorpBeijingChina Infrastructure Inspection Institute China Academy of Railway Sciences Corporation LimitedBeijingChina

Purpose–High-speed turnouts are more complex in structure and thus may cause abnormal vibration of highspeed train car body,affecting driving safety and passenger riding ***,it is necessary to analyze the data characteristics of continuous hunting of high-speed trains passing through turnouts and propose a diagnostic method for engineering ***/methodology/approach–First,Complete Ensemble Empirical Mode Decomposition with Adaptive Noise(CEEMDAN)is performed to determine the first characteristic component of the car body’s lateral ***,the Short-Time Fourier Transform(STFT)is performed to calculate the marginal ***,the presence of a continuous hunting problem is determined based on the results of the comparison calculations and diagnostic *** improve computational efficiency,permutation entropy(PE)is used as a fast indicator to identify turnouts with potential ***–Under continuous hunting conditions,the PE is less than 0.90;the ratio of the maximum peak value of the signal component to the original signal peak value exceeded 0.7,and there is an energy band in the STFT time-frequency map,which corresponds to a frequency distribution range of 1–2 ***/value–The research results have revealed the lateral vibration characteristics of the high-speed train’s car body during continuous hunting when passing through *** this basis,an effective diagnostic method has been *** a focus on practical engineering applications,a rapid screening index for identifying potential issues has been proposed,significantly enhancing the efficiency of diagnostic processes.

关键词： High-speed railway Periodic hunting Rapid diagnosis CEEMDAN STFT Permutation entropy Paper type Research paper

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