西南交通大学学报

Analysis of AT Power Supply Network in AC Electrified Railway

LI Qunzhan, GUO Kai, ZHOU Fulin

2012, 25(1): 1-6. doi: 10.3969/j.issn.0258-2724.2012.01.001

[Abstract](2337)

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Abstract:
The method of compound sequence analysis based on two-phase symmetrical components transform was used to further analyze AT (auto transformer) power supply network in AC electrified railway with clear concepts. Sequence models for AT power supply network components were described, such as traction p...

Transmittal Signal Frequency of Centre-Fed Ballastless Track Circuit

ZHANG Youpeng, , ZHAO Bin, TIAN Mingxing

2012, 25(1): 7-11. doi: 10.3969/j.issn.0258-2724.2012.021.01.002

[Abstract](1588)

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Abstract:
To determine the frequency range of centre-fed ballastless track circuit, based on the frequency character of the first parameters and the two-port network coefficient expressions of centre-fed ballastless track circuit in normal, shunt and broken-rail operation modes and the different initial value...

Method of Cross-Layer Performance Optimization in Wireless Multi-hop Networks

LI Zhijie, , FANG Xuming

2012, 25(1): 12-18,31. doi: 10.3969/j.issn.0258-2724.2012.021.01.003

[Abstract](1691)

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Abstract:
In order to meet the different performance requirements of traffics in wireless mesh network and Ad Hoc network, a cross-layer optimization algorithm was proposed. An adaptive modulation and coding method to keep constant average packet error rate was presented, and the performance of traffics was a...

PedestrianDetectionandTrackingBasedonAutomotiveVision

Guo Lie, GAO Long, ZHAO Zongyan

2012, 25(1): 19-25. doi: 10.3969/j.issn.0258-2724.2012.021.01.004

[Abstract](1658)

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Abstract:
To improve the automotive active safety and guarantee the safety of pedestrians under urban transportation conditions, a pedestrian protection method based on automotive vision was presented. The Adaboost algorithm was utilized to detect pedestrians rapidly, and the Kalman filter principle was adopt...

Output Control of CLC Type Contactless Power Transfer Systems

WANG Zhihui, SUN Yue, DAI Xin, SU Yugang, TANG Chunsen

2012, 25(1): 26-31. doi: 10.3969/j.issn.0258-2724.2012.021.01.005

[Abstract](1691)

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Abstract:
To achieve the output control of CLC type contactless power transfer (CPT) systems, a system model was built using the discrete time mapping method, and an analytic expression of periodic fixed points was given. On this basis, a soft-switching frequency computing method and an output power calculati...

Backdoors of Message Propagation Algorithm Convergence

WANG Xiaofeng, XU Daoyun, QIN Yongbin

2012, 25(1): 32-38,62. doi: 10.3969/j.issn.0258-2724.2012.021.01.006

[Abstract](1313)

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Abstract:
In order to investigate the convergence of the WP (warning propagation) algorithm, backdoors of the WP algorithm were given. By assigning values to variables in the backdoors, the Boolean formula can be simplified to sub-formula having factor graph with tree structures, and the convergence of the WP...

Adaptive Evolution Technology for Collaborative SaaS Platform of Industrial Chains

WANG Shuying

2012, 25(1): 39-45. doi: 10.3969/j.issn.0258-2724.2012.021.01.007

[Abstract](1381)

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Abstract:
An adaptive evolution method for a collaborative SaaS (software as a service) platform of industrial chains was proposed based on dynamic binding, implicit authority, and autonomous model for enterprises, to adapt itself to frequent changes in users and their businesses. An adaptive evolution model ...

Design of Zero Correlation Zone Sequences via Interleaving Perfect Sequence

WANG Longye, WANG Xian

2012, 25(1): 46-49. doi: 10.3969/j.issn.0258-2724.2012.021.01.008

[Abstract](1287)

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Abstract:
Abstract: To reduce the limit on the relevant parameters during constructing zero correlation zone (ZCZ) sequences, a novel construction method was proposed to design the near-optimal sequence set with ZCZ. Using the interleaving technique and recursive algorithm, a new ZCZ sequence set can be gener...

Aerodynamic Characteristics of Vehicle-Bridge System under Cross Wind: Wind Tunnel Test System with Moving Vehicle Model

LI Yongle, HU Peng, ZHANG Mingjin, LIAO Haili

2012, 25(1): 50-56. doi: 10.3969/j.issn.0258-2724.2012.021.01.009

[Abstract](1708)

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Abstract:
In order to consider the effects of vehicle motion on the aerodynamic characteristics of a vehicle-bridge system, a new test system with a moving vehicle model was developed regarding to the aerodynamic characteristics of ambient flow around the vehicle-bridge system to realize the synchronous measu...

Limit Bearing Capacity of Longitudinal Clapboard of Long-Span Single Pylon Cable-Stayed Bridge

WEI Xing, QIANG Shizhong

2012, 25(1): 57-62. doi: 10.3969/j.issn.0258-2724.2012.021.01.010

[Abstract](1916)

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In order to investigate the limit bearing capacity of longitudinal clapboard, nonlinear buckling analysis and model test on the longitudinal clapboard used in streamlined steel-box girder of Pearl River Huangpu bridge in Guangzhou were performed. Based on the ANSYS software, a refined finite element...

Multi-scale Monitoring System Construction of River-Bed Scouring around Sutong Bridge

CHEN Zhijian, TANG Yong, CHEN Song

2012, 25(1): 63-67,77. doi: 10.3969/j.issn.0258-2724.2012.021.01.011

[Abstract](1318)

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In order to monitor the river-bed scouring depth around Sutong bridge, a small-scale monitoring system was established with water piezometers to realize the real-time monitoring of the scouring depth in the middle area of pile-group foundation, and the sites of the water piezometers were optimized b...

Optimization of Complex Cross-Section Metro Tunnel Excavation and Its Influence on Building

QI Taiyue, BAI Yongxue, LI Bin

2012, 25(1): 68-77. doi: 10.3969/j.issn.0258-2724.2012.021.01.012

[Abstract](1865)

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A 3D numerical model for complex cross-section tunnel and building was set up based on the FLAC3D, and five construction methods were optimized by numerical simulations to determine the optimal construction method by taking subsidences of ground surface and the building and stress in the structure a...

Microstructure Fractal Feature of Dredger Fill during Seepage Flow Consolidation

NIU Cencen, WANG Qing, TAN Chun, CHEN Huie, ZHOU Fujun

2012, 25(1): 78-83. doi: 10.3969/j.issn.0258-2724.2012.021.01.013

[Abstract](1244)

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In order to analyze the change law of the microstructure of dredger fill in the process of seepage flow consolidation, the fractal theory was applied to quantitatively describe the structural characteristics of the microstructure of dredger fill and analyze the curing mechanism of dredger fill. Labo...

Semi-analytical Solutions for One-Dimensional Consolidation of Layered Soil Obeying Exponential Flow Law

LI Chuanxun, XIE Kanghe, HU Anfeng

2012, 25(1): 84-89. doi: 10.3969/j.issn.0258-2724.2012.021.01.014

[Abstract](1199)

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Abstract:
To calculate one-dimensional consolidation settlement of layered soil obeying an exponential flow law, an exponential flow law model was introduced into the classical consolidation theory for layered soil. The governing equation for one-dimensional consolidation of layered soil was established by co...

Failure Prediction and Post-Failure Behavior of Typical Rock under Triaxial Compression

WANG Dong, LIU Changwu, WANG Ding, CAO Lei, DU Xinliang, 　　

2012, 25(1): 90-96. doi: 10.3969/j.issn.0258-2724.2012.021.01.015

[Abstract](1389)

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In order to research the failure prediction and post-failure constitutive model of rock under triaxial stress, the triaxial compression tests of limestone and sandstone were conducted under different confining pressures, the regularities of deformation and failure and the relationship between streng...

Tool Trajectory Optimization of Spray Painting Robot for Composite Conical Surfaces

ZENG Yong, GONG Jun, YANG Dongya, NING Huifeng

2012, 25(1): 97-103. doi: 10.3969/j.issn.0258-2724.2012.021.01.016

[Abstract](1791)

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In order to solve the problem of poor coating uniformity of composite conical surfaces in tool trajectory optimization, a spray tool trajectory generation method was proposed according to the geometrical characteristics of conical surfaces. Using the spray trajectory optimization method that is base...

Self-synchronization and Stability of Two-Times Frequency Shaker Excited by Bi-shaft

HOU Yongjun

2012, 25(1): 104-108. doi: 10.3969/j.issn.0258-2724.2012.021.01.017

[Abstract](1869)

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Abstract:
Differential equations of phase angle differences between two exciting shafts of a bi-frequency self-synchronous shaker were derived based on the differential equations of shaker motion and those of rotation of the two exciting shafts. The necessary conditions for self-synchronization of the two sha...

Two Precise Time-Integration Methods for Structural Dynamic Analysis

FAN Xuanhua, CHEN Pu, MU Wenpin

2012, 25(1): 109-114. doi: 10.3969/j.issn.0258-2724.2012.021.01.018

[Abstract](1584)

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Similarities and differences in solving dynamic equations between precise time-integration method with augmented matrix (PTI-AM) and extended precise time-integration method (EPTI) were analyzed. The explicit, discrete and recursive expressions for both methods were deduced, respectively, with the e...

Design of Photoacoustic Imaging System with High Positioning Accuracy Based on PCI4732

RONG Jian, CHEN Bingzhang, ZHONG Xiaochun, HUANG Lin, JIANG Huabei

2012, 25(1): 115-120. doi: 10.3969/j.issn.0258-2724.2012.021.01.019

[Abstract](1262)

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In order to research the photoacoustic imaging abilities of different absorbers, a photoacoustic imaging system was developed based on Labview software design platform coupled with PCI4732 and high positioning accuracy rotation stage RT-5-10. This system consists of a pulsed laser, an immersion prob...

Design of 16-Way High Power Divider

ZHANG Jianqiong, LIU Qingxiang, LI Xiangqiang, ZHAO Liu

2012, 25(1): 121-126. doi: 10.3969/j.issn.0258-2724.2012.021.01.020

[Abstract](1262)

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Abstract:
In order to meet the requirement for the feeding system of high power microwave (HPM) radiation antenna and overcome the shortage of current multi-port high power divider, a novel 16-way high power divider was developed. The novel high power divider is composed of coaxial waveguide- 4-way rectangula...

AnalysisofAirFlowFieldinAirConditioningSystem andCompartmentsofHigh-SpeedTrains

LIU Jie, LI Renxian, CHEN Lin, LI Shudian

2012, 25(1): 127-132. doi: 10.3969/j.issn.0258-2724.2012.021.01.021

[Abstract](1830)

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In order to test the rationality of the air-conditioning system design of high-speed trains, an entire geometry model for compartment and air-conditioning system of high-speed trains was built considering the characteristics of negative pressure at fresh-air inlet, complicated air-conditioning pipes...

Experimental Study on Electrochemical Corrosion Mechanism of Welded Bogies

YU Xinian, WANG Baoyan, LIU Jun

2012, 25(1): 133-138. doi: 10.3969/j.issn.0258-2724.2012.021.01.022

[Abstract](1443)

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In order to reveal the corrosion law of welded bogies, three types of steel plates and their welded specimens used for welded bogies were put in 3.5%NaCl solution, and their corrosion potentials and AC impedances were analyzed. Polarization curves of the specimens were obtained through potentiodynam...

Quantitative Analysis of Parameters of Vascular Bioreactor

LIU Yanqiu, HUANG Nan, ZOU Yuanwen, HUANG Xuejin, LI Jinchuan, FAN Yubo

2012, 25(1): 139-143,150. doi: 10.3969/j.issn.0258-2724.2012.021.01.023

[Abstract](1385)

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A vascular bioreactor was designed and constructed by Beihang University and Sichuan University for Southwest Jiaotong University for simulating in vivo environments. The performance indicators of the bioreactor including shearing stress, the state of laminar flow, and pulse pressure were analyzed q...

Prediction of Railway Freight Volumes Based on Grey Adaptive Particle Swarm Least Squares Support Vector Machine Model

GENG Liyan, LIANG Yigang

2012, 25(1): 144-150. doi: 10.3969/j.issn.0258-2724.2012.021.01.024

[Abstract](1496)

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Abstract:
In order to improve the forecasting accuracy and the modeling speed for railway freight volumes, the grey forecasting model GM (1, 1) and the adaptive particle swarm optimization (APSO) were both introduced into the least squares support vector machines (LSSVMs). Thus, a new model, the grey APSO lea...

Variable Weight Method for Multi-objective Optimization of Freight Flow Allocation in Logistics Network

ZHOU Xiao, ZHANG Jin, ZHANG Fei, LIU Sijing

2012, 25(1): 151-157. doi: 10.3969/j.issn.0258-2724.2012.021.01.025

[Abstract](1363)

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Abstract:
To overcome the shortness of traditional weighted-sum method (WSM) for multi-objective optimization of freight flow allocation in logistics network, a variable weight method was proposed, in which the weights of optimization objectives are variable. The variable weights are determined by preset weig...

Following Phenomenon and Air Freeway Flow Model

WANG Lili, ZHANG Xinyu, ZHANG Zhaoning

2012, 25(1): 158-162. doi: 10.3969/j.issn.0258-2724.2012.021.01.026

[Abstract](1578)

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Air freeways connecting long-distance city-pairs with heavy traffic flow in the next generation aviation transportation system (NGATS) are characterized by monolayer route with single direction, no crossover, aircraft performance limitation, and high density of operation. In order to study the traff...

Arrival-Departure Capacity and Its Influencing Factors

HU Jun, HU Haibo

2012, 25(1): 163-168. doi: 10.3969/j.issn.0258-2724.2012.021.01.027

[Abstract](1503)

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In order to mitigate flight delays caused by airport capacity limitation, a novel arrival-departure capacity model was built with the maximum flow as the objective. In this model, a discrete-time mixed queuing algorithm is employed to form the transition probability matrix for potential conflicts, a...

Removal of Heavy Metals from Sludge by Bio-leaching

XU Youze, MA Chao, CHENG Yingxiang, WANG Qiangqiang, ZHONG Zhenyu

2012, 25(1): 169-174. doi: 10.3969/j.issn.0258-2724.2012.021.01.028

[Abstract](1096)

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Abstract:
In order to reduce the harm of heavy metals in sludge to environment, the effect of medium pH, microorganism inoculation amount, leaching temperature, and cycle leaching time on removal of heavy metals was studied by single factor experiment, and the content change of heavy metals in the process of ...

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2012 Vol. 25, No. 1