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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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Investigation of cracking mechanism of the first tunnel lining during double-arch tunnel construction

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Underground Space 2024年第1期14卷 1-17页

作者： Yi Sui Xiaohui Cheng Zuozhou Zhao Weibin Ma railway Engineering Research Institute China Academy of Railway Sciences Corporation LimitedBeijing 100081China School of Civil Engineering Tsinghua UniversityBeijing 100084China

To solve the engineering problem of the first tunnel lining cracking caused by the second tunnel construction of double-arch highway tunnels,a research method combining distributed optical-fibre monitoring,inversion analysis and numerical simulation that can reflect lining cracking was *** fibres were laid on opposite sides of the steel arches inside the first tunnel *** optical-fibre monitoring was conducted continuously during the second tunnel *** on the fibre-optic strain profile,the lining cracking was deduced and warned in *** mechanical behaviour of the steel arch was investigated by the inversion analysis,which took into consideration the integrated impact of axial force and flexural moment.A two-dimensional(2D)load-structure method–based numerical model was established,considering the influence of different load distributions in each construction *** total strain rotating crack constitutive model was applied to reflect the cracking behaviour of concrete lining in the simulation,and the model was calibrated and verified in the *** analysis between the simulated strain distribution and the distributed optical-fibre monitoring results was carried *** deformation mode and crack distribution of the lining were *** cracking mechanism was ***,the second tunnel construction led to the loading at the top of the middle partition wall and the release of rock pressure in the first *** these load changes,the secondary lining of the first tunnel cracked on the inner side of the top of the middle partition wall owing to tension,and compression-bending failure occurred near the right arch ***,the influence of the parameters on the lining force was analysed,and a construction optimisation scheme was proposed.

关键词： Double-arch tunnel Cracking mechanism Distributed optical-fibre sensing Inversion analysis Total strain rotating crack model Loadstructure method

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DOA and Subarray-Interval Estimation for Arbitrarily Distributed UAV Swarm System

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China Communications 2023年第4期20卷 102-117页

作者： Dian Fan Yue Zhu Jia You Zhe Wang Nan Zhong The China academy of Information and Communications Technology Beijing 100191China The China academy of railway sciences corporation limited Beijing 100081China

In this paper,DOA and subarray-interval estimation are considered and applied to arbitrarily distributed unmanned aerial vehicle(UAV)swarm system,in which multiple small UAVs containing uniform linear array(ULA)are divided by unknown intervals because of dynamic *** parameters are taken to indicate the steering vector,namely,the direction of arrivals(DOAs)of target users,the intervals of UAVs,and the orientation angles of *** orientation angles are first estimated with an auxiliary user and the DOAs are obtained through a search free rooting method,despite the intervals among the ***,the intervals among UAVs can also be calculated via exhaustive when the number of target users are no less than *** further develop a low-complex method to reduce the computational complexity during subarray-interval *** deterministic Cramér-Rao bound(CRB)of the DOA,orientation angle and subarray-interval can be inferred in a closed ***,numerical instances are cited to verify the research results.

关键词： distributed subarray DOA orientation angle subarray-interval CRB

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The design and application of BIM+refined management and control platform for the Jingxiong railway bridge

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High-Speed railway 2023年第3期1卷 211-218页

作者： Jinghan Zhang Jiayu Li Beisheng Liu Hui Li Wei Yang China academy of railway sciences corporation limited Beijing 100081China

The high-speed railway construction involves multiple professional fields,such as railway design,construction,and *** paper architects the"BIM+"project refined management platform,designs the platform's logical architecture,physical architecture,and solves several key technology ***"BIM+"platform has been applied on the Jingxiong Bridge Project and achieved all-round,whole-process and multi-management of high-speed railway engineering *** significantly improves the level of construction management,and plays a role in promoting the development of high-speed railway construction informatization.

关键词： Informatization The Jingxiong Bridge Project Platform architecture GIS(Geographic Information System) BIM(Building Information Modelling)

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Design and implementation of railway green performance basic data collection system

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High-Speed railway 2023年第4期1卷 265-272页

作者： Xiangru Lyu Hui Li China academy of railway sciences corporation limited Beijing 100081China

This study addressed the issues related to the collection and management of basic data for railway green performance. A railway green performance basic database has been constructed based on metadata and data exchange schemas. A data classification system has been established from the perspectives of businesses, processes,and entities. A BIM(Building Information Modelling) model data extraction scheme is proposed based on field similarity matching and a document content extraction scheme is proposed based on image recognition. A railway green performance basic data collection system has been developed, achieving efficient collection and integrated management of railway green performance basic data. This system can provide data support for applications such as railway carbon emissions accounting, green cost-benefit analysis, and evaluation of green design solutions.

关键词： railway Green performance Data collection Metadata Data classifcation BIM Image recognition

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Experimental and Numerical Investigation on the Aerodynamic Characteristics of High-Speed Pantographs with Supporting Beam Wind Deflectors

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Fluid Dynamics & Materials Processing 2024年第1期20卷 127-145页

作者： Shiyang Song Tongxin Han Postgraduate Department China Academy of Railway SciencesBeijing100081China Locomotive&Car Research Institute China Academy of Railway Sciences Corporation LimitedBeijing100081China

Aiming to mitigate the aerodynamic lift force imbalance between pantograph strips,which exacerbates wear and affects the current collection performance of the pantograph-catenary system,a study has been conducted to support the beam deflector optimization using a combination of experimental measurements and computational fluid dynamics(CFD)*** results demonstrate that the size,position,and installation orientation of the wind deflectors significantly influence the amount of force *** also indicate that the front strip deflectors should be installed downwards and the rear strip deflectors upwards,thereby forming a“π”***,the lift force compensation provided by the wind deflectors increases with the size of the *** wind compensation strategies,such as control circuits,are also discussed,putting emphasis on the pros and cons of various pantograph types and wind compensation approaches.

关键词： High-speed pantograph aerodynamic lift force supporting beam wind deflectors computational fluid dynamics(CFD)

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A multi-mode multi-skill project scheduling reformulation for reconnaissance mission planning

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Science China(Information sciences) 2022年第6期65卷 267-268页

作者： Junqi CAI Zhihong PENG Sijian LIAO Shuxin DING School of Automation Beijing Institute of Technology Signal and Communication Research Institute China Academy of Railway Sciences Corporation Limited

Dear editor,Planning multi-agents scheduling to conduct reconnaissance missions is the core of reconnaissance decision support system. A reconnaissance mission comprises several tasks and a network representing precedence relationships between them, where each task represents an area in which the agents perform information gathering.

关键词： reconnaissance RCPSP multi-mode multi-skill scheduling multi agent system

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Mechanical properties of foamed polyurethane solidified ballasted track

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High-Speed railway 2023年第2期1卷 120-129页

作者： Yang Xu Luchao Qie Hong Wang Wenying Yu railway Engineering Research Institute China Academy of Railway Sciences Corporation LimitedBeijing 100081China

Foamed Polyurethane Solidified Ballasted Track(FPSBT),an innovative railway track,is formed by solidifying ballast bed with foamed *** with the traditional Discrete Ballasted Track(DBT),FPSBT does not require regular maintenance such as tamping and ***,limited studies exist on the mechanical properties of *** this study,Laboratory experiments are conducted on polyurethane samples to investigate the effects of polyurethane density on the mechanical properties of ***,the performance of DBT and FPSBT with different polyurethane densities are compared,and the recommended polyurethane density is *** exhibited negligible accumulation of deformation under cyclic loads,indicating excellent performance of FPSBT owing to the anti-deformation properties of ***,a track load vehicle test is *** exhibited better load-transmitting ability than ***,the construction and application of FPSBT in China are *** study is expected to contribute to realizing a more extensive application of FPSBT.

关键词： Ballasted track Foamed polyurethane Solidified track Track load vehicle

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An FFT Performance Model for Optimizing General-Purpose Processor Architecture

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Journal of Computer Science & Technology 2011年第5期26卷 875-889页

作者：李玲陈云霁刘道福钱诚胡伟武 Institute of Computing Technology Chinese Academy of Sciences Loongson Technologies corporation limited

General-purpose processor （GPP） is an important platform for fast Fourier transform （FFT）,due to its flexibility,reliability and *** is a representative application intensive in both computation and memory access,optimizing the FFT performance of a GPP also benefits the performances of many other *** facilitate the analysis of FFT,this paper proposes a theoretical model of the FFT *** model gives out a tight lower bound of the runtime of FFT on a GPP,and guides the architecture optimization for GPP as *** on the model,two theorems on optimization of architecture parameters are deduced,which refer to the lower bounds of register number and memory *** results on different processor architectures （including Intel Core i7 and Godson-3B） validate the performance *** above investigations were adopted in the development of Godson-3B,which is an industrial *** optimization techniques deduced from our performance model improve the FFT performance by about 40%,while incurring only 0.8% additional area ***,Godson-3B solves the 1024-point single-precision complex FFT in 0.368 μs with about 40 Watt power consumption,and has the highest performance-per-watt in complex FFT among processors as far as we *** work could benefit optimization of other GPPs as well.

关键词： fast Fourier transform (FFT) general-purpose processor (GPP) performance prediction model vector unit DMA

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Physical Implementation of the Eight-Core Godson-3B Microprocessor

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Journal of Computer Science & Technology 2011年第3期26卷 520-527页

作者：王茹范宝峡杨梁高燕萍刘动肖斌王江嵋张译夫王宏胡伟武 Institute of Computing Technology Chinese Academy of Sciences Graduate School of Chinese academy of sciences Loongson Technologies corporation limited

The Godson-3B processor is a powerful processor designed for high performance servers including Dawning Servers. It offers significantly improved performance over previous Godson-3 series CPUs by incorporating eight CPU cores and vector computing units. It contains 582.6 M transistors within 300 mm2 area in 65 nm technology and is implemented in parallel with full hierarchical design flows. In Godson-3B, advanced clock distribution mechanisms including GALS （Globally Asynchronous Locally Synchronous） and clock mesh are adopted to obtain an OCV tolerable clock network. Custom-designed de-skew modules are also implemented to afford further latency balance after fabrication. The power reduction of Godson- 3B is maintained by MLMM （Multi Level Multi Mode） clock gating and multi-threshold-voltage cells substitution schemes. The highest frequency of Godson-3B is 1.05 GHz and the peak performance is 128 GFlops （double-precision） or 256 GFlops （single-precision） with 40 W power consumption.

关键词： physical implementation hierarchical design flow GALS clock mesh low power

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