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A New Parallel Algorithm in Power Flow Calculation:Dynamic Asynchronous Parallel Algorithm

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Journal of Modern Transportation 2000年第2期17卷 145-151页

作者：刘学军钱清泉刘军 institute of railway electrification and automation Southwest Jiaotong University Chengdu610031 China

Based on the general methods in power flow calculation of power system and on conceptions and classifications of parallel algorithm, a new approach named Dynamic Asynchronous Parallel Algorithm that applies to the online analysis and real-time dispatching and controlling of large-scale power network was put forward in this paper. Its performances of high speed and dynamic following have been verified on IEEE-14 bus system.

关键词： power flow calculation parallel algorithm MAT

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

A Network Model on the Processing of Image

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Journal of Modern Transportation 1994年第2期11卷 110-113页

作者： Qian Qingquan Li Feng(Research institute of railway electrification and automation),Southwest Jiaotong university , Chengdu 610031, China Research institute of railway electrification and automation Southwest Jiaotong University Chengdu 610031 China

By imitating the construction of human eyes, a network model, on-center off-surround,on the processing of the image is presented. The activity of the cellunder the perturbing of an input pattern is discussed in this paper. Authors alsoanalyse the feature of the network model on the matching of the input patterns ,suppressing of the uniform spatial noise and detecting of the edges.

关键词： activity on-center off-surround network

Fault diagnosis of high-speed train bogie based on LSTM neural network

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Science China(Information Sciences) 2021年第1期64卷 260-262页

作者： Deqing HUANG Yuanzhe FU Na QIN Shibin GAO institute of System Science and Technology Southwest Jiaotong University National Rail Transit electrification and automation Engineering Technique Research Center Southwest Jiaotong University

Dear editor,With the extensive implementation of high-speed railway acceleration,higher requirements for safety and stability are put *** order to guarantee the safety of the highspeed train (HST),it is critical to detect the abnormal state in *** that plays an important role in reducing vehicle vibration is connected to the track and the train body,and its health condition directly affects the safe operation of train.

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Dynamic Interaction Analysis of Coupled Axial-Torsional-Lateral Mechanical Vibrations in Rotary Drilling Systems

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Structural Durability & Health Monitoring 2025年第1期19卷 77-103页

作者： Sabrina Meddah Sid Ahmed Tadjer Abdelhakim Idir Kong Fah Tee Mohamed Zinelabidine Doghmane Madjid Kidouche Applied automation Laboratory Faculty of Hydrocarbons and ChemistryUniversity of BoumerdesBoumerdes35000Algeria institute of Electrical and Electronic Engineering(IGEE) University of BoumerdesBoumerdes35000Algeria Laboratory of the electrification of Industrial Enterprises University of BoumerdesBoumerdes35000Algeria Electrical Engineering Department Mohamed Boudiaf University of M’silaM’sila28000Algeria Department of Civil and Environmental Engineering King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center for Construction and Building Materials King Fahd University of Petroleum&Minerals(KFUPM)Dhahran31261Saudi Arabia

Maintaining the integrity and longevity of structures is essential in many industries,such as aerospace,nuclear,and *** achieve the cost-effectiveness of large-scale systems in petroleum drilling,a strong emphasis on structural durability and monitoring is *** study focuses on the mechanical vibrations that occur in rotary drilling systems,which have a substantial impact on the structural integrity of drilling *** study speciﬁcally investigates axial,torsional,and lateral vibrations,which might lead to negative consequences such as bit-bounce,chaotic whirling,and high-frequency *** events not only hinder the efﬁciency of drilling but also lead to exhaustion and harm to the system’s components since they are difﬁcult to be detected and controlled in real *** study investigates the dynamic interactions of these vibrations,speciﬁcally in their high-frequency modes,usingﬁeld data obtained from measurement while ***ﬁndings have demonstrated the effect of strong coupling between the high-frequency modes of these vibrations on drilling sys-tem *** obtained results highlight the importance of considering the interconnected impacts of these vibrations when designing and implementing robust control ***,integrating these compo-nents can increase the durability of drill bits and drill strings,as well as improve the ability to monitor and detect ***,by exploiting theseﬁndings,the assessment of structural resilience in rotary drilling systems can be ***,the study demonstrates the capacity of structural health monitoring to improve the quality,dependability,and efﬁciency of rotary drilling systems in the petroleum industry.

关键词： Rotary drilling systems mechanical vibrations structural durability dynamic interaction analysis ﬁeld data analysis

Ice-covered Environmental Adaptability Assessment for Overhead Contact System in High-speed railways

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Chinese Journal of Electrical Engineering 2024年第2期10卷 70-79页

作者： Huan Zhang Wenfu Wei Like Pan Zefeng Yang Guizao Huang Yuxin Liu Xing Chen Ziqian Yang Guangning Wu School of Electrical Engineering Southwest Jiaotong UniversityChengdu 611756China National Rail Transit electrification and automation Engineering Technology Research Center Southwest Jiaotong UniversityChengdu 611756China China Academy of railway Sciences Corporation Limited Beijing 100000China

High-speed trains rely on pantograph-catenary systems(PCSs)to collect electrical energy from power ***,the dynamic interaction between the pantograph and the catenary system may become mismatched once ice accumulates on the overhead *** frequent arcing may occur within the PCS during train operation,posing an unpredictable threat to operational ***,it is crucial to evaluate the ability of overhead contact system(OCS)to withstand ice-covered variability during line desgin.A new strategy is proposed to evaluate the adaptive performance of an OCS under various icing ***,a dynamic model considering icing conditions is constructed to simulate the interaction within the *** different OCS structures with various icing thicknesses are *** parameters of the contact force within the PCS and proportion of high-possibility arcing moments are *** dependence of the contact force on the icing thickness and pantograph displacement has been illustrated in the form of cloud ***,the OCS sensitivity coefficient is calculated,and ice-covered environmental adaptability assessments for the five different OCS structures are compared.

关键词： Overhead contact system environmental adaptability sensitivity coefficient icing thickness contact force

Adaptive droop control for better current-sharing in VSC-based MVDC railway electrification system

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Journal of Modern Power Systems and Clean Energy 2019年第4期7卷 962-974页

作者： Salman AATIF Haitao HU Xiaowei YANG Yinbo GE Zhengyou HE Shibin GAO College of Electrical Engineering Southwest Jiaotong UniversityChengduChina National Rail Transit electrification and automation Engineering Technique Research Center Southwest Jiaotong UniversityChengduChina

The share of voltage source converter(VSC)technology is increasing in conventional power systems,and it is penetrating into specific transportation systems such as electric vehicles,railways,and *** are identifying feasible methods to improve the performance of railway electrification systems(RESs)by utilizing VSC-based medium-voltage direct current(MVDC)*** continuous motion of electric trains makes the catenary resistance a variable quantity,as compared to the traction substation(TSS),and affects the currentsharing behavior of the system.A modified droop control technique is proposed in this paper for VSC-based MVDC RES to provide more effective current-sharing while maintaining catenary voltages above the minimum allowable *** droop coefficient is selected through an exponential function based on the ratio between the concerned TSS current and the system average *** enables small adjustments of droop values in less concerning marginal current deviations,and provides higher droop adjustments for large current ***,the catenary voltages are regulated by considering the voltage data at the midpoint between two TSSs,which experiences the lowest voltages owing to the larger distance from the *** proposed techniques are validated via simulations and experiments.

关键词： railway electrification Voltage source converter(VSC) Medium-voltage direct current(MVDC) Current-sharing Renewable energies in railways

Methods of Depth Measurement and Image Fusion Based on Multi-focus Micro-images

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Methods of Depth Measurement and Image Fusion Based on Multi...

Power System Transients Analysis by Wavelet Transforms

第25届中国控制与决策会议

作者： Yin Ying-jie Wang Xin-gang Xu De Zhang Zheng-tao Bai Ming-ran Shi Gang Research Center of Precision Sensing and Control Institute of Automation Chinese Academy of Sciences Wuhan railway Bureau

ISBN: (纸本)9781467355339

When a small object is measured by micro cameras, a sharp image of the whole object is impossible to be obtained because the depth of the object’s surface is different and the distance between different parts of the object’s surface maybe deeper than the depth of field of the micro camera. The camera is focused on different areas of the object’s surface and a series of multi-focus images are taken. The relative depths between the object surface’s different sub-regions will be got by comparing image sharpness evaluation function values of multi-focus images’ same sub-regions and considering the relative position between the camera and the object. Thus the surface depth is obtained. Multi-focus images’ sub-regions with maximum image sharpness evaluation function values are combined into an image. The experimental results verify the effectiveness of the proposed methods.

关键词： depth of field sharpness evaluation function depth measurement multi-focus micro-image image fusion

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Journal of Southwest Jiaotong University(English Edition) 2002年第1期10卷 1-9页

作者：陈维荣宋永华赵蔚 institute of railway electrification and automation Southwest Jiaotong University Chengdu 610031 China Department of Electronic and Computer Engineering Brunel University Uxbridge UB8 3PH UK

In contrast to Fourier transform, wavelet transform is especially suitable for transient analysis because of its time frequency characteristics with automatically adjusted window lengths. Research shows that wavelet transform is one of the most powerful tools for power system transient analysis. The basic ideas of wavelet transform are presented in the paper together with several power system applications. It is clear that wavelet transform has some clear advantages over other transforms in detecting, analyzing, and identifying various types of power system transients.

关键词： wavelet transform power system transient Fourier transform