西南交通大学学报

Driving Effects of Speed Increase on Development of Railway Transportation in China

PENG Qiyuan, WEN Chao, YAN Haifeng

2008, 21(6): 685-691.

[Abstract](1719)

Abstract:
The achievements in the six railway speed increases in China were summarized comprehensively following a review on the speed increases.During the processes of the speed increases,the Chinese railway made great progresses in the following fields.The railway transportation operation mode with the char...

Automation for Offset Plot of Train Flow Lines

CHENG Xueqing, PU Yun

2008, 21(6): 692-696.

[Abstract](1523)

Abstract:
To automatically search key vertexes of train flow lines in a train flow diagram,its components and characteristics were analyzed based on graph theory.An algorithm for searching the key vertexes and that for offset plot of train flow lines were proposed.Train flow diagrams were plotted based on the...

Driver Fatigue Detection Based on Unscented Kalman Filter and Eye Tracking

ZHANG Zutao, ZHANG Jiashu

2008, 21(6): 697-702.

[Abstract](1730)

Abstract:
In order to resolve the problem of fast head moving,nonlinear eye tracking and facial fatigue expression detection,a new scheme of driver fatigue detection was proposed based on unscented Kalman filter(UKF) and eye tracking.Owing to the intuition that it is easier to approximate a probability distri...

Bi-level Programming for Optimal Inventory Control with Offsetting Replenishment Cycles

GAO Qingping, YAN Qipeng, LIN Yu, LUO Yu

2008, 21(6): 703-708.

[Abstract](1540)

Abstract:
The inventory strategy for multiple products sharing a warehouse in a logistics system was studied.The hypotheses were that the mean total inventory cost consisted of constant ordering cost per order,fixed cost determined by the required warehouse space and variable cost determined by the stored pro...

Investigation on Properties and Mechanism of HPCM Stabilizing Roadbed of Expressway

HE Zhen, WANG Lei, WANG Xuebin, LIANG Wenquan, HUANG Xiaoxia

2008, 21(6): 709-713,746.

[Abstract](1607)

Abstract:
To enhance the stability of soil filled in the roadbed of expressway,a high performance consolidating material(HPCM) was used to improve the stability of primary soil,and its performances such as CBR(California bearing ratio) value,compactness and expansion were investigated through a physical test,...

Maximum Speed Limit on Freeway with Damaged Pavement

CHENG Guozhu, PEI Yulong

2008, 21(6): 714-717.

[Abstract](1550)

Abstract:
A model to correlate passenger uncomfortableness index with vehicle speed,standard deviation of pavement roughness and pavement condition index(PCI) was derived by regression from observed data.Suggestions about maximum speed limits on freeways under different pavement conditions were presented base...

Simulated Determination of Accuracy Requirement for Control Points Ⅲ Intersection Networks in High-Speed Railway

LIU Chenglong, YANG Youtao, XU Xiaozuo

2008, 21(6): 718-723.

[Abstract](1337)

Abstract:
To meet the accuracy requirement of relative positioning,it is necessary to perform the further investigation on the form of CPⅢ(control points Ⅲ) control networks and the precision evaluation of observations from field surveying.By combining the standard with the improved forms of CPⅢ control netwo...

Conversion of GPS Height Based on Bayesian Regularization BP Neural Network

SONG Lei, HUANG Teng, FANG Jian, ZHOU Xuhua

2008, 21(6): 724-728.

[Abstract](1642)

Abstract:
In order to improve the over-fitting in GPS(global positioning system) height conversion using BP(back propagation) neural network,a new method of GPS height conversion based on the Bayesian regularization BP neural network was proposed.Using the GPS/leveling data in a certain area,this new method w...

Analysis Method of Dynamic Stability of Suspended-Dome Structures

LUO Yongfeng, LIU Huijuan, HAN Qinghua

2008, 21(6): 729-735.

[Abstract](1489)

Abstract:
Analysis methods of the dynamic stability of suspended-dome structures were discussed.A theoretical investigation was conducted based on the Lypumov dynamic stability theory.The investigation shows that it is difficult to obtain the dynamic instability criterion of a suspended-dome structure under a...

BP Neural Network-Based Prediction of Load-Bearing Capacity of Concrete Column Reinforced by FRP

PAN Yi, YANG Cheng, LIN Yongjun, ZHAO Shichun

2008, 21(6): 736-739.

[Abstract](1683)

Abstract:
In order to enhance the calculation accuracy of concrete columns reinforced by FRP(fiber reinforced polymer) under axial compression,a BP(back propagation) neural network model was established to predict the load-bearing capacity of a concrete column reinforced by FRP under axial compression.The BP ...

Calculation of Spanwise Vortex-Induced Vibration Responses of Long-Span Bridge Girder

XIAN Rong, LIAO Haili, LI Mingshui

2008, 21(6): 740-746.

[Abstract](1772)

Abstract:
To provide accurate reference data to vibration restraint,based on the one-dimensional experienced linear VIV(vortex-induced vibration) model the vertical and torsional VIV spanwise responses of a bridge girder were deduced by synthetically considering factors such as mode shape,damping ratio and vo...

Numerical Analysis of Flow around Two Tandem Circular Cylinders

ZHENG Tinghui, FEI Baoling, YANG Junliu, TANG S K

2008, 21(6): 747-750,798.

[Abstract](1524)

Abstract:
To avoid the sympathetic vibration,the flow around two circular cylinders with an equal diameter in a tandem arrangement was researched numerically using the finite volume method.Strouhal number as a function of spacing ratio and Reynolds number was investigated.The research results show that the be...

Numerical Simulation of Starting Process of Supersonic Pulse Wind Tunnel

ZHANG Xiaoqing, LE Jialing, XU Mingheng

2008, 21(6): 751-755.

[Abstract](1416)

Abstract:
To analyze the transmitting process of incident shock and the transient flows,the starting process was simulated numerically.In the simulation,the control equations were the conservational Navier-Stokes equations with a species diffusion term,which describe two-dimensional viscous,compressible and u...

Simulation Research on Fuzzy Shift Strategy of Automobile

WU Shijing, ZHU Enyong, LI Qunli, WANG Xiaosun

2008, 21(6): 756-761.

[Abstract](1646)

Abstract:
In order to avoid shift cycle in the process of fuzzy control for automatic transmission shift,a new fuzzy control strategy was designed.A shift map obtained from an experiment was divided into an upshifting map and a downshifting map,and two corresponding fuzzy controllers,upshifting controller and...

Self-Excited Torsional Vibrations of Drive System of Locomotive under Slippage

YAO Yuan, ZHANG Hongjun, CHEN Kang, JIN Dingchang

2008, 21(6): 762-766.

[Abstract](1745)

Abstract:
A simplified model for torsional vibrations of a single wheel-set drive system was used to study torsional vibrations of a locomotive under slippage.In the model,torsional stiffness of the shaft of a wheel set and that between the traction motor and the wheel-set were taken into account.The phase tr...

Adaptive Control of Humanoid Robot Movement

DENG Xingqiao, WANG Jinge, FANG Chun, ZHU Weibing

2008, 21(6): 767-771.

[Abstract](1565)

Abstract:
The dynamic and kinematic formulas were derived based on Danevit-Hartenberg coordinate transformation,and the generalized Jacobian matrix was obtained.An adaptive controller was designed to ensure the asymptotic stability of the robot system.Simulated snapshots and joint trajectories of a dancing hu...

Efficient Computation of Space-Time Finite Element Method

LI Tian, ZHANG Jiye, ZHANG Weihua

2008, 21(6): 772-777.

[Abstract](1745)

Abstract:
To improve the computational efficiency and reduce the requirement on memory in solving two-dimensional transient incompressible Navier-Stokes equations with space-time finite method,the compressed sparse row format was used to store the large-scale sparse matrix,Newton-Raphson method was adopted to...

Simulation of Turbo Code System Based on Simulink

ZHONG Xiaochun, HAN Jiajia, LIANG Nawei

2008, 21(6): 778-781.

[Abstract](1479)

Abstract:
Based on the theory and architecture of Turbo coding and decoding,a model of Turbo code simulation for controllable coding/decoding was designed with software Matlab/Simulink and used in the system with BPSK(binary phase-shift keying) modulation in AWGN(additive white Gaussian noise) channel.An inve...

Design of X-Band 4-Element Square Helical Array Antenna Fed from Radial Line

ZHAO Liu, LIU Qingxiang, CHEN Xiaobo, LI Xiangqiang

2008, 21(6): 788-792.

[Abstract](1854)

Abstract:
To probe into the approach of array antenna with high power and high gain,a square helical array antenna fed from a radial line was proposed and designed,and its fundamental principle was presented.The radiation element,the coupling probe and the feeding system were designed in details,as a result,a...

Fuzzy Assessment of Web Resource Quality

ZHU Yan

2008, 21(6): 793-798.

[Abstract](1415)

Abstract:
To integrate high quality Web resources and improve the performance of a Web information system,fuzzy logic and multi-criteria decision making(MCDM) methods were investigated.FTOPSIS method,integrated by the fuzzy logic technique and the TOPSIS(technique for order preference by similarity to ideal s...

Fragile Watermarking Scheme with Abilities of Self-restoration and Discrimination of Tampers on Image Content or Watermark

FAN Mingquan, WANG Hongxia

2008, 21(6): 799-805.

[Abstract](1618)

Abstract:
Based on the fact that the current fragile watermarking scheme with the ability of tamper discrimination can not discriminate tampers effectively,a novel fragile watermarking scheme with the abilities of self-restoration and discrimination of tampers on image content or watermark was proposed.In thi...

Field Emission and Photoluminescence Properties of Al-Doped T-ZnO Whiskers

FAN Ximei, ZHOU Zuowan, LI Yanxia, ZHANG Huiguang

2008, 21(6): 806-809,815.

[Abstract](1197)

Abstract:
Al-doped tetrapod-like ZnO(T-ZnO) films were fabricated using screen printing method to study their structures,surface morphologies,optical properties and field emission behaviors.All samples show typical photo luminescence(PL) behaviors with two emissions of a narrow UV peak centering around 373 to...

Experimental Investigation on Aerated Concrete with Addition of Lead-Zinc Tailings

LI Fangxian, CHEN Youzhi, LONG Shizong

2008, 21(6): 810-815.

[Abstract](1536)

Abstract:
Lead-zinc tailings were used to produce aerated concrete.The effects of water-binder ratio,casting temperature and aluminum powder content on the gas forming behavior,and those of lead-zinc tailing content,cement content and conditioning agents on the compressive strength of the aerated concrete wer...

Key Techniques of Information System Construction for Non-stable Multi-model Logistics Enterprises

ZHANG Xueyan, CHEN Ning

2008, 21(6): 816-821.

[Abstract](1530)

Abstract:
Businesses of logistics enterprises in transformation are in multi-mode and complicated.The information system for these enterprises should be constructed based on two aspects: process integration and information system architecture optimization to assure its adjustability and expansibility.An optim...

Weak Target Detection of Passive Radar in Strong Jamming Environment

LIU Zhiqiang, MA Hongguang, YANG Lifeng

2008, 21(6): 782-787.

[Abstract](1043)

Abstract:
It is difficult for a passive radar to detect weak targets under the background of strong jamming coming from large targets,near air fleet or deception jam.Based on the connection between strong and reference signals,the relationship between the amplitude-range-Doppler surface and the ambiguity func...

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2008 Vol. 21, No. 6