西南交通大学学报

MPPT Control of Partial Shadow Photovoltaic Generation System Based on Improved PSO Algorithm

CHEN Weirong, WANG Weiying, ZHENG Yibin, ZHENG Yongkang, LI Qi

2018, 53(6): 1095-1101, 1129. doi: 10.3969/j.issn.0258-2724.2018.06.001

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Under partial shading condition, the traditional MPPT （maximum power point tracking） is suitable for local optimisation, which cannot track to the global MPP. To solve this problem, a maximum power tracking method based on adaptive learning factor particle swarm optimisation is proposed in this stud...

Reliability Evaluation of Relay Protection for Traction Substation of Urban Rail Transit

LIN Sheng, LIN Xiaohong, FENG Ding

2018, 53(6): 1102-1109. doi: 10.3969/j.issn.0258-2724.2018.06.002

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To understand the reliability and find the weaknesses in the relay protection system of urban rail transit traction substation to provide guidance for failure investigation, a reliability evaluation project of relay protection for urban rail transit traction substation was undertaken. First, the rel...

Study on Impact on Negative Sequence of Single Three-Phase Combined Co-Phase Power Supply System

WANG Pingxiang

2018, 53(6): 1110-1116. doi: 10.3969/j.issn.0258-2724.2018.06.003

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The negative sequence is one of the main power quality issues in the tractive power supply system in our country. The structure and characteristics of a single three-phase combined co-phase power supply system are introduced herein, to study the impact of the negative sequence of a single three-phas...

Analysis of Lightning Breakdown Characteristics of Contaminated Insulators in Parallel Clearance

LIAO Yifan, HU Chuanliang, TANG Jun, YANG Fan, CHEN Zhihao, ZHOU Yu, LU Zhanhui

2018, 53(6): 1117-1122. doi: 10.3969/j.issn.0258-2724.2018.06.004

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To analyse the lightning impulse breakdown characteristics of the parallel gaps of contaminated insulators with different salt densities, the SC-210 porcelain cross-arm insulator was used to conduct the lightning impulse test. Comparing with the electric field simulation results of the clean and con...

Adaptive Cuckoo Optimization DV-HOP Localization Algorithm Based on Multi-Communication Radius and Error Correction

YU Xiuwu, HU Mufang, LIU Yong, GUO Qian

2018, 53(6): 1123-1129. doi: 10.3969/j.issn.0258-2724.2018.06.005

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An adaptive cuckoo optimization DV-HOP localization algorithm based on multi-communication radius and error correction （MEACS-D）is proposed, aiming at addressing the problem of lager error in wireless sensor networks of range-free DV-HOP algorithms. Using the anchor nodes, which have the ability to ...

Analysis and Testing of Network Security for China Railway Communication Networks and Proposed Architecture Based on Trusted Computing

LI Saifei, YAN Lianshan, LI Hongzhe, GUO Wei, ZHANG Weijun, LIU Qingtao

2018, 53(6): 1130-1136, 1149. doi: 10.3969/j.issn.0258-2724.2018.06.006

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China’s railway communication networks have been deployed throughout the country and have a complex infrastructure. A security architecture based on trusted computing and software-defined networking （SDN） has thus been proposed for ensuring the security of the railway communication system. The secur...

Tunnel Crack Extraction Based on Adaptive Threshold and Connected Domain

LUO Jia, LIU Dagang

2018, 53(6): 1137-1141, 1149. doi: 10.3969/j.issn.0258-2724.2018.06.007

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To solve the problems of traditional tunnel crack detection, such as low efficiency, subjectivity and poor safety, among others, a method of tunnel crack extraction based on adaptive threshold and connected domain marking is proposed using orientation and continuity characteristics. First, according...

Quantum Image Encryption Algorithm Based on Chaotic System and DNA Coding

ZHANG Jian, HUO Da

2018, 53(6): 1142-1149. doi: 10.3969/j.issn.0258-2724.2018.06.008

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To ensure the security of quantum information, a quantum image encryption algorithm based on combining a chaotic system and DNA coding is proposed. Firstly, the image is expressed as a quantum superposition state, and the quantum image is then scrambled by a unitary matrix generated by logistic chao...

Optimization of Endmember Extraction in Mixed Pixel Unmixing in Hyperspectral Images

HUANG Zuowei, ZHANG Suifeng, ZHANG Taoxin

2018, 53(6): 1150-1156, 1172. doi: 10.3969/j.issn.0258-2724.2018.06.009

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Hyperspectral unmixing is a process for unmixing the mixed pixels of a hyperspectral image composed of several substances and their corresponding proportions. Extracting endmembers is a major problem in hyperspectral unmixing. Owing to the goal of achieving a large search range for the endmembers, t...

Multiscale Modeling of Transition Section with Continuously Welded Rail Based on Homogenization Method

GUO Yishi, YU Zujun, SHI Hongmei, ZHU Liqiang

2018, 53(6): 1157-1165. doi: 10.3969/j.issn.0258-2724.2018.06.010

[Abstract](514)

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To analyse the stress distribution of continuously welded rails at transition sections under the effect of temperature, a multiscale model of the transition section with two-terminal rail lines is proposed. Owing to the structural regularity of the two-terminal bridge and the subgrade extending from...

Two Simplified Models for Human-Structure Vertical Interaction

CAO Lilin, CAO Dong, YU Guojun

2018, 53(6): 1166-1172. doi: 10.3969/j.issn.0258-2724.2018.06.011

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Based on a mass-spring-damper（MSD）model and a mass-spring-damper-rigid mass（MMSD）model, which are two kinds of pedestrian simplified models, the equations of vertical dynamic interaction pertaining to a simplified human-structure were deduced by the regularization structure modal function. Using the...

Non-Linear Analysis of Three-Segment Stiffness Compressive Bar Based on Direct Stiffness Method

ZHANG Junxing, XU Jing, WANG Hongzhi

2018, 53(6): 1173-1178, 1186. doi: 10.3969/j.issn.0258-2724.2018.06.012

[Abstract](591)

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To study the internal forces and displacement of a piecewise stiffness compressive bar with a consideration of the second-order effect, displacement and rotation equations were established based on the displacement governing equation. The displacement coefficients were obtained according to the disp...

Large Eddy Simulation of Unsteady Downburst Outflow Based on Wall Jet Model

ZHONG Yongli, YAN Zhitao, WANG Lingzhi, YOU Yi

2018, 53(6): 1179-1186. doi: 10.3969/j.issn.0258-2724.2018.06.013

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The feasibility of a large-scale experiment for downburst in a boundary layer wind tunnel was investigated. Large eddy simulation （LES） was employed to investigate the characteristics of stationary and travelling downburst using the impinging jet and wall jet methods, respectively. The velocity prof...

Axial Compressive Experiment on Steel-Jacket Retrofitted Column with Recycled Aggregate Concrete

HE An, CAI Jian, CHEN Qingjun, XUE Hua, ZUO Zhiliang, TANG Xulin, LI Kaiyu

2018, 53(6): 1187-1194, 1204. doi: 10.3969/j.issn.0258-2724.2018.06.014

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To realise the goals of energy saving and emissions reduction in the construction industry, a new retrofitting method of steel-jacket retrofitted columns with recycled aggregate concrete is presented. An unstrengthened column, twelve steel-jacket retrofitted columns, and two concrete-filled steel-tu...

Analysis of LRB-DSB Three Dimensional Isolation System’s Isolating Effect

GUO Yangzhao, PAN Yi, WU Ti, LI Jingwen, WANG Zichao

2018, 53(6): 1195-1204. doi: 10.3969/j.issn.0258-2724.2018.06.015

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In order to study the isolating effect of the three dimensional laminated rubber bearings-dish spring bearing （LRB-DSB） isolation system, comprehensive analyses for its construction, mechanism, and design theory were performed. On the basis of these analyses, comparative studies of the vibration cha...

Mathematical Description and Analysis on Characteristics of Pore Structure for Foam Concrete

LI Fangxian, YU Qijun, LUO Yunfeng, WEI Jiangxiong

2018, 53(6): 1205-1210. doi: 10.3969/j.issn.0258-2724.2018.06.016

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To analyse the characteristics of the pore structure of foam concrete and reveal the relationships between various pore structure parameters, dense and non-dense packing structure models were established. A formula for the calculation of pore structure parameters, including porosity, surface area, a...

Research on Calibration Equipment for Multi-Range Earth Pressure Cell and Calibration Experimentation

YIN Zihong, ZHAO Fengnian, GAO Xue, JIANG Liangwei, SU Qian

2018, 53(6): 1211-1219. doi: 10.3969/j.issn.0258-2724.2018.06.017

[Abstract](468)

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The general problems encountered in obtaining accurate soil pressure test-data are determined by performing a literature review of the research on calibration devices for soil pressure cells. Then, a finite element simulation for the calibration of multi-range soil pressure cell equipment is perform...

Study of Influencing Factors on Cone Factor for Cone Penetration in Marine Clay

QIU Min, YAO Aiguo, DENG Guoqing, WANG Yanchao

2018, 53(6): 1220-1226. doi: 10.3969/j.issn.0258-2724.2018.06.018

[Abstract](444)

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To study the influence of the rigidity index, strain softening, and strain rate on the cone factor of marine clay, cone penetration in clay is simulated on the basis of the finite element method, and an arbitrary Lagrangian-Eulerian （ALE） technique is adopted to control the quality of mesh under the...

Parameters Analysis Based on Simplified Method to Solve Piled Embankment with Geogrid-Reinforcement

LIU Feicheng, ZHANG Jianjing, YAN Shijie, CAO Licong, WU Zuoju

2018, 53(6): 1227-1236. doi: 10.3969/j.issn.0258-2724.2018.06.019

[Abstract](431)

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In order to analyze the influence of parameters on load transfer and deformation mechanisms of piled embankment with geogrid-reinforcement, a simplified method was proposed and employed for parameters analysis. A method including soil arching effect in granular material, subsoil resistance and membr...

Study of Large Deformation Classification Criterion for Layered Soft Rock Tunnels under High Geostress

CHEN Ziquan, HE Chuan, WU Di, DAI Cong, YANG Wenbo, XU Guowen

2018, 53(6): 1237-1244. doi: 10.3969/j.issn.0258-2724.2018.06.020

[Abstract](756)

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The asymmetric deformation failure characteristics and asymmetric mechanical behaviour of supporting structures in layered soft rock tunnels under high geostress, combined with the anisotropic mechanical properties of carbonaceous phyllite, were investigated. Based on the deformation data of 93 laye...

Optimization of Structural Setting Based on Forced Ventilation Method in Tunnel Under Construction

QIAO Liwei

2018, 53(6): 1245-1252, 1277. doi: 10.3969/j.issn.0258-2724.2018.06.021

[Abstract](468)

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Considering the disadvantages of poor air quality and prolonged dust removal caused by the forced ventilation mode in tunnel construction using drilling and blasting methods, the extractive and air curtain ventilation mode was developed by structure optimization and improvement over the traditional ...

Automated Lane Marking Identification Based on Improved Canny Edge Detection Algorithm

LUO Wenting, LI Zhongyi, LI Lin, GAN Hong, GUO Jiangang

2018, 53(6): 1253-1260. doi: 10.3969/j.issn.0258-2724.2018.06.022

[Abstract](584)

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In a pavement distress survey, a wandering survey vehicle would reduce the accuracy of lateral position measurement of pavement distress. The errors in the measurement of distress lateral position can be eliminated based on the lane marking identified using an edge detection algorithm. However, the ...

Cause-based Distribution Models of Affected Trains Account for Primary Delay in High-Speed Rail

WEN Chao, LI Zhongcan, HUANG Ping, TANG Yixiong, JIANG Chaozhe, GAO Lei

2018, 53(6): 1261-1269. doi: 10.3969/j.issn.0258-2724.2018.06.023

[Abstract](467)

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To measure the severity of high-speed train delays, the distributions models of the affected trains, owing to different cause-based primary delays, were established using statistical modeling. First, the train operation records during 2014 and 2015 obtained from China Railway Guangzhou Group Co. Ltd...

Multi-Scenario Optimisation Model for Reusable Logistics Resource Allocation

REN Jianwei, CHEN Chunhua, ZHANG Xueyan

2018, 53(6): 1270-1277. doi: 10.3969/j.issn.0258-2724.2018.06.024

[Abstract](533)

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In order to solve the reusable logistics resource（RLR）allocation problem where some uncertain parameters cannot be estimated using historical data, and the types and dimensions of RLR are varied, a multi-scenario optimisation model for RLR allocation was studied using the method of scenario planning...

Logistics Service Composition Based on Multi-Objective Optimization

ZHANG Fei, ZHANG Jin

2018, 53(6): 1278-1285, 1307. doi: 10.3969/j.issn.0258-2724.2018.06.025

[Abstract](482)

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Given the reform in railway freight transportation, the authors developed an end-to-end logistics service to respond more promptly and effectively to customers’ diverse, individual needs. They built a Web-based service model, incorporating all the characteristics of traditional logistics services. T...

Lower Limb Muscle Co-Contraction and Coupling Synergy in Exoskeleton Assistance for Load Carriage Walking

LI Huaixian, CHENG Wenming, LIU Fang, ZHANG Mingkui, YANG Chunmei

2018, 53(6): 1286-1294. doi: 10.3969/j.issn.0258-2724.2018.06.026

[Abstract](447)

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Human-robot interaction performance was evaluated, and better exoskeleton structures and human-robot adaptability control strategies were explored. The muscle activity, paired-muscle contraction index, and synergy coupling of the muscles of nine healthy male subjects carrying loads and walking with ...

Analysis of Residual-Stress Test Errors via Ultrasonic Method for Aluminium Alloy Used in High-Speed Trains

LI Minggao, SUN Hairong, GOU Guoqing, YU Jinpeng

2018, 53(6): 1295-1300. doi: 10.3969/j.issn.0258-2724.2018.06.027

[Abstract](450)

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To study the influence of different errors incurred during ultrasonic residual-stress detection on test data concerning key components of high-speed trains, the relationship between the anisotropy of A5083 and 6005A materials, in terms of texture and ultrasonic propagation time, was investigated. Th...

Effect of Heat Treatment on Microstructures and Properties of Wire and Arc Additive-Manufactured Bainite Steel

FU Youheng, WANG Guilan, YIN Shuang, ZHANG Haiou, LONG Zuohong

2018, 53(6): 1301-1307. doi: 10.3969/j.issn.0258-2724.2018.06.028

[Abstract](568)

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It is difficult to actively control the thermal cycle in wire and arc additive manufacturing（WAAM）, resulting in uneven microstructures and poor mechanical properties. Therefore, an anisothermal quenching and tempering process for bainite steel deposition is presented herein. The microstructures and...

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2018 Vol. 31, No. 6