西南交通大学学报

Challenges in Construction of Railway and Highway from Sichuan to Tibet through Eastern Margin of Tibetan Plateau

YAO Lingkan, QIU Yanling, WEI Yongxing

2012, 25(5): 719-734. doi: 10.3969/j.issn.0258-2724.2012.05.001

[Abstract](1483)

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Abstract:
The construction of railway and highway to Tibet through the eastern margin of the Tibetan Plateau has started step by step as the implementation of the Western Development Strategy. The controlling problems in the construction and the corresponding key techniques need to be studied urgently. The ge...

Design and Dynamical Analysis of New Light Deployable Bridge

GUAN Fuling, ZHOU Yijun, KUANG Qi, QIAN Lifeng

2012, 25(5): 735-740,747. doi: 10.3969/j.issn.0258-2724.2012.05.002

[Abstract](1689)

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To rapidly across ditches, valleys and other artificial or natural barriers for personnel, a new light deployable military bridge was developed. Scissors and sleeves are adopted to realize the axial deployment. A motor is used to drove a main cable to expand the bridge until it reaches a designed lo...

Stability Analysis of Edong Yangtze River Bridge during Construction

ZHAO Lei, SUN Caizhi, YANG Xingwang

2012, 25(5): 741-747. doi: 10.3969/j.issn.0258-2724.2012.05.003

[Abstract](1195)

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Abstract:
In order to research the change law of non-linear stability and its influencing factors of a long-span composite cable-stayed bridge during construction, by taking Edong Yangtze River bridge as research subject, LSB and ANSYS models were built based on the structure type and construction sequence of...

Elastic Modulus Reduction Method for Upper Bound Limit Analysis of Structure Containing Flaws

ZHANG Wei, LIU Liwen, YANG Lufeng, WU Wenlong

2012, 25(5): 748-753. doi: 10.3969/j.issn.0258-2724.2012.05.004

[Abstract](1216)

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In order to obtain the limit load of a structure containing flaws (SCF), an elastic modulus reduction method (EMRM) for upper bound limit analysis of SCF was proposed. The determination method for reference element bearing ratio was investigated to a stress concentration problem. An efficient elasti...

Calculation of Longitudinal Connected Slab Reinforcement Considering Expansion and Contraction of Bridge

CHEN Xiaoping

2012, 25(5): 754-760. doi: 10.3969/j.issn.0258-2724.2012.05.005

[Abstract](1376)

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To optimize the reinforcement design of longitudinal connected slab for CRTSⅡ-type slab ballastless track on bridge, a computational method of stiffness reduction on the longitudinal connected slab was derived. Longitudinal forces acting on the longitudinal connected slab were analyzed. It was propo...

Adaptive Mutation Disturbance Particle Swarm Optimization Algorithm Based on Personal Best Position

LIU Zhigang, ZENG Jiajun, HAN Zhiwei

2012, 25(5): 761-768. doi: 10.3969/j.issn.0258-2724.2012.05.006

[Abstract](1341)

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In order to overcome the disadvantage of the particle swarm optimization (PSO) that it easily falls into local optimum, an adaptive mutation disturbance particle swarm optimization (AMDPSO) algorithm based on personal best position was proposed. This algorithm is based on PSO, and the disturbance is...

Adaptive Foreground Detection Based on Weighted Kernel Density Estimation

JIANG Peng, JIN Weidong

2012, 25(5): 769-775. doi: 10.3969/j.issn.0258-2724.2012.05.007

[Abstract](1155)

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In order to avoid the impacts of moving foreground on background modeling in training stage, an adaptive foreground detection method based on weighted kernel density estimation (KDE) was proposed. In this method, temporal stable pixels are assigned more weights, and a weighted KDE background model i...

Realization of Computer-Aided Aircraft Tolerance Design

GUO Changhong, ZHAN Zaiji, WANG Zhenyu

2012, 25(5): 776-783. doi: 10.3969/j.issn.0258-2724.2012.05.008

[Abstract](1154)

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In order to solve the problem of aircraft tolerances computerization, the modeling techniques of aircraft tolerance were researched. Using UG (UniGraphics) second development technology and VC++, computer-aided aircraft tolerance optimization design modules were developed in the UG platform to reali...

Extraction and Calibration of Trajectory Characteristics of Vehicles at Intersections

JIANG Sheng, WANG Dianhai, QU Zhaowei, HU Hongyu

2012, 25(5): 784-789. doi: 10.3969/j.issn.0258-2724.2012.05.009

[Abstract](1049)

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In order to probe into the running characteristics of vehicles at intersections, the composite feature extraction algorithm was used to obtain the trajectory characteristics of vehicles in images. Based on the algorithm of polygon linear scan calibration, considering the influence of the distortion ...

Image Alignment Algorithm for Multi-projector Display System Based on Structured Light

XIAO Chao, YANG Hongyu, SU Xianyu

2012, 25(5): 790-796. doi: 10.3969/j.issn.0258-2724.2012.05.010

[Abstract](1226)

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In order to solve the problem of image alignment in a multi-projector display system, an image alignment algorithm based on the structured light projection technique was proposed. The algorithm uses intersection points of phase-equal lines to establish the mapping relation between projector images a...

Received Signal Strength Indicator Circuit for Wireless Communication Systems

HE Xiaofeng, MA Chengyan, YE Tianchun, GAN Yebin, JIN Yuhua

2012, 25(5): 797-805. doi: 10.3969/j.issn.0258-2724.2012.05.011

[Abstract](1291)

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To solve the problems that accuracy of traditional signal strength indicator circuit is low and resistance to temperature and process variations is not enough strong, a system model for RSSI (received signal strength indicator) circuit was set up. The relationship between limiting amplifier gain and...

Multi-agent-Based Coordination Control of Continuous Cophase Traction Power Supply System

ZHAO Yanling, LI Qunzhan

2012, 25(5): 806-813. doi: 10.3969/j.issn.0258-2724.2012.05.012

[Abstract](1344)

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In order to solve the problems of power quality, electric section-phase insulator of the traction power supply system for electrified railway, which will affect the high-speed and heavy-load train running normally, a viewpoint on establishing an intelligent traction power supply system based on mult...

Contactless Power Transfer System with Stabilized Frequency and High Efficiency Based on Impedance Conversion

XIA Chenyang, ZHANG Yanbing, WU Xiaojie, SUN Yue, ZUO Lan, LI Chaowei

2012, 25(5): 814-819. doi: 10.3969/j.issn.0258-2724.2012.05.013

[Abstract](1534)

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Aimed at the problem that the variation of load resistance can seriously affect the resonant frequency and efficiency of a contactless power transfer (CPT) system, a stabilized frequency and high efficiency CPT system design method based on impedance conversion was put forward to improve its frequen...

Solution for Speed Sensorless Control System Restarting at Unknown Speed of Traction Motor

XIONG Chenglin, FENG Xiaoyun, SONG Wensheng

2012, 25(5): 820-825,831. doi: 10.3969/j.issn.0258-2724.2012.05.014

[Abstract](1106)

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In order to solve the problem that a traction motor may restart at unknown speed when a speed sensorless control system is applied in electric traction drives, a new strategy using regenerative mode to replace coasting mode is presented on the basis of analyzing the train's operating state and the r...

Numerical Simulation of Two-Dimensional Laminar Flow around Circular Cylinder with Splitter Plate

HE Chuan, DUAN Zhiqiang

2012, 25(5): 826-831. doi: 10.3969/j.issn.0258-2724.2012.05.015

[Abstract](1615)

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In order to study the effect of splitter plate on flows past through a circular cylinder, the finite volume method, unstructured grids, and the laminar flow model were used to solve the two-dimensional incompressible N-S equation. A thin plate was placed along the horizontal centerline downstream of...

Unsteady Characteristics of Vortex Breakdown over Delta Wing

ZHANG Minglu, YANG Yiren, LÜ, Zhiyong

2012, 25(5): 832-835. doi: 10.3969/j.issn.0258-2724.2012.05.016

[Abstract](905)

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In order to investigate the unsteady characteristics of the broken vortices over delta wing after the leading edge vortices were broken down, experiments of dynamic pressure measurement were carried out on the surface of the 75? sweep delta wing in a wind tunnel. Experimental results show that the r...

Numerical Simulation of Ultrasonic Wave Propagation in Wheel/Rail Material

DENG Weili

2012, 25(5): 836-841,848. doi: 10.3969/j.issn.0258-2724.2012.05.017

[Abstract](1533)

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To enhance the application of ultrasonic waves to rail flaw detection and train safety monitoring, a finite model was introduced to study the ultrasonic sound field distribution characters. In this model, the acoustic field due to ultrasonic propagating in rail was simulated with different frequenci...

Load Control of Ship Accelerating Process Based on PI Controller

HUANG Bin, WANG Yongsheng

2012, 25(5): 842-848. doi: 10.3969/j.issn.0258-2724.2012.05.018

[Abstract](1272)

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A simulation model for a combined diesel or gas turbine (CODOG) propulsion system was built in Matlab/Simulink, and the veracity of this model was validated using the trail data of actual ship. Through the model, two existing accelerating control approaches were simulated and their flexibility was e...

Application of Multirate Unscented Kalman Filter to State Estimation in Vehicle's Active Front Steering System

ZHOU Cong, XIAO Jian, WANG Song

2012, 25(5): 849-854,894. doi: 10.3969/j.issn.0258-2724.2012.05.019

[Abstract](1219)

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In order to improve the control quality of the single-rate digital control strategy in a complex system, an input multirate unscented Kalman filter (IMRUKF) was developed by combination of multirate digital control systems and the unscented Kalman filter (UKF) algorithm. The IMRUKF algorithm was app...

Design and Performance Analysis of Efficient Semi-active Energy-Regenerative Suspension

YANG Heli

2012, 25(5): 855-860. doi: 10.3969/j.issn.0258-2724.2012.05.020

[Abstract](1438)

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On the basis of normal gear and rack type suspension, an efficient semi-active energy-regenerative suspension was designed to improve the damping properties and energy-regenerative characteristics of gear and rack type suspension. This suspension consists of a NdFeB permanent magnet generator, a var...

Delay Map Matching Algorithm of Mass GPS Data Based on Topological Judgment

WANG Zhijian, WANG Li, WANG Jian

2012, 25(5): 861-866. doi: 10.3969/j.issn.0258-2724.2012.05.021

[Abstract](1109)

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Traditional algorithms for vehicle map matching can not be applied directly because of lengthy GPS date cycle, low relevance of road topology structure and a number of data in the processing of floating car data collection. For this reason, a new algorithm of delay map matching was proposed based on...

Judgment of Train Operation Conflict and Its Implementation for High-Speed Railway

WEN Chao, PENG Qiyuan, CHEN Yuhong

2012, 25(5): 867-873. doi: 10.3969/j.issn.0258-2724.2012.05.022

[Abstract](1526)

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In order to improve railway traffic control level and ensure railway operation safety, the judgment methods for 7 types of train operation conflicts were studied, including time interval conflicts between two adjacent trains at stations, conflicts of section occupation, utilization conflict of arriv...

Multi-objective Model for Logistics Distribution Programming Considering Logistics Service Level

GUO Xiaofang, WANG Yuping

2012, 25(5): 874-880. doi: 10.3969/j.issn.0258-2724.2012.05.023

[Abstract](1056)

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To improve the customer satisfaction on the service of logistics distribution, a multi-objective optimization model for logistics distribution programming under the three-level supply chain was developed. In this model, minimization of total expenses and maximization of logistics service level were ...

Solving the Mode Selection Problem with Fixed Transportation Cost in Intermodal Transportation

LI Yu, ZHAO Jun, WU Gang, CHEN Jiaqi

2012, 25(5): 881-887. doi: 10.3969/j.issn.0258-2724.2012.05.024

[Abstract](1242)

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To organize the intermodal transportation in a more cost-effective way, the problem of selecting the transportation mode in each link along the transportation route of an intermodal shipment was addressed by taking into account the fixed and variable transportation cost simultaneously. Aiming at min...

Car-Following Model Based on Optimal Distance and Its Characteristics Analysis

YANG Da, PU Yun, YANG Fei, ZHU Liling

2012, 25(5): 888-894. doi: 10.3969/j.issn.0258-2724.2012.05.025

[Abstract](1514)

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To reveal the mechanism of car-following behaviors more accurately, a car-following optimal distance model (ODM) was proposed based on analysis of the optimal distance function, under an assumption that drivers in a car-following process always tend to maintain an optimal spacing distance. Then, the...

Analysis Model of Transport Aircraft Veering off Runway during Landing Phase

HUO Zhiqin, RU Yi, HAN Songchen

2012, 25(5): 895-900. doi: 10.3969/j.issn.0258-2724.2012.05.026

[Abstract](1095)

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In order to overcome the flaws of traditional fault tree analysis which can only describe two states: normal or fault, a combined method based on fault tree (FT) and Bayesian Network (BN) for landing aircraft veering off runway analysis was put forward. The new method not only took the advantages of...

Measuring Traffic Conflict of Single Ship Crossing Ship Flow Based on Integrative Distance Index

CHENG Zhiyou, LIU Qing, HE Detao, LI Zhite

2012, 25(5): 901-906. doi: 10.3969/j.issn.0258-2724.2012.05.027

[Abstract](1140)

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Abstract:
To supervise the traffic risk of single ship crossing ship flow in waters, an integrative distance index was proposed to measure the traffic conflict of single ship crossing ship flow by considering the impact of single ship crossing's dynamic course and associated multi-objects. A primary model was...

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2012 Vol. 25, No. 5