西南交通大学学报

New Method for Infrared Dim Target Detection Based on Wavelet and SVR

RONG Jian, SHEN Jine, ZHONG Xiaochun

2008, 21(5): 555-560.

[Abstract](1490)

Abstract:
By analyzing dim target and background characteristics from infrared images,a new detection method based on the wavelet transform and the support vector regression adaptive filter(WTSVRAF) was presented.With this method,the wavelet transform is used to inhibit the majority of background clutter.Then...

Successive Interference Cancellation Algorithm Based on Gram-Schmidt Orthogonalization Algorithm

ZHANG Donghong, LIAO Guisheng

2008, 21(5): 561-565.

[Abstract](1578)

Abstract:
A new SIC(successive interference cancellation) algorithm based on the Gram-Schmidt orthogonalization algorithm was presented.Unlike the conventional SIC algorithm,this algorithm uses an optimal despreading sequence,locally generated by the Gram-Schmidt orthogonalization of spreading sequences,to de...

SVPWM Control of Three Level Inverter for Traction Drive in EMUs

GE Xinglai, FENG Xiaoyun

2008, 21(5): 566-572.

[Abstract](1528)

Abstract:
Space vector pulse-width modulation(SVPWM) control strategies were proposed for three level inverters of traction drives in high-speed EMUs(electrical multiple units).A constant-maximum-switching-frequency asynchronous modulation control strategy is applied during starting and low-speed periods of t...

Transient Stability Assessment Based on Random Forest Algorithm

YE Shengyong, WANG Xiaoru, LIU Zhigang, QIAN Qingquan

2008, 21(5): 573-577.

[Abstract](1831)

Abstract:
A model for the power system transient stability assessment based on random forest algorithm was presented.This model combines decision trees which depend on the values of a random vector sampled independently and with the same distribution.Simulation results on the IEEE 16-generator and IEEE 50-gen...

Theoretical Analysis of Autocorrelation Function of Image as Sharpness Evaluation Function

SONG Kang, ZHANG Tao, LIAO Junbi

2008, 21(5): 578-581,659.

[Abstract](1766)

Abstract:
The effectiveness and feasibility to take an autocorrelation function as the evaluation function of images were proved theoretically according to the Wiener-Khintchine theorem.The autocorrelation function of an image has the same physical meaning with grey variation,grade and grey entropy functions....

Variable Precision Fuzzy Rough Model for Data Analysis

FENG Lin, WANG Guoyin

2008, 21(5): 582-587.

[Abstract](1574)

Abstract:
A variable precision fuzzy rough data model(VPFRDM) that is an extension of Ziarko’s variable precision rough set(VPRS) model was proposed based on fuzzy set.A method for attribute reduction from a fuzzy decision information system was developed,in which the attribute importance is taken as the heur...

Propagation Characteristics of Metal Circular Waveguide Filled with Multilayer Reciprocal Chiral Media

XIONG Tianxin, YANG Rugui

2008, 21(5): 588-594.

[Abstract](1362)

Abstract:
With the method of separation of variables,the general mode eigenequation of the metal circular waveguide filled with multilayer reciprocal chiral media was given.From the general eigenequation,the mode eigenequation of metal circular waveguide filled with an ordinary medium can be obtained.To revea...

Analyzing Method for Vehicle Collision Based on Dent Superposition

ZHANG Jian, ZHANG Xin

2008, 21(5): 595-599.

[Abstract](1786)

Abstract:
The traditional method is not applicable to analyzing some vehicle collision accidents without the definite colliding positions.To solve this problem,a dent superposition method was proposed,in which the dents on involved vehicles are superposed to represent their meshing state at the colliding mome...

Grey Analysis of Airport Apron Safety

LIU Gang, ZHU Jinfu

2008, 21(5): 600-604.

[Abstract](1622)

Abstract:
A weighting method combining subjective and objective weighting,the former being G1 method and the latter being mean-square error method,was proposed to determine weights of indices of airport apron safety.A grey evaluation model for airport apron safety was presented using grey analysis and analyti...

Combined Evolution of Self-organization and Hetero-organization of Urban Traffic System

JIANG Kejin, ZHANG Dianye, LIU Fanxiao

2008, 21(5): 605-609.

[Abstract](1739)

Abstract:
The evolution of an urban traffic system is a combined processes of self-organization and hetero-organization,and the non-linear effects(cooperation and competition) between the subsystems are the essential driving forces for the evolution of the urban traffic system.A combined evolution model for s...

Simulation of Rain and Snow in Visual Simulation of Train Operation

HE Hongyun, SU Hu

2008, 21(5): 610-615.

[Abstract](1681)

Abstract:
A simulation method for rain and snow in visual simulation of train operation was proposed.A real-time rain and snow particle system was designed based on the physical model of raining and snowing.The implement of the particle system was discussed,including the definition of particles,control of par...

Local Stability of Balancing Speed of Train under Condition of Air Brake

L? Hongxia, LIAO Yong

2008, 21(5): 616-620.

[Abstract](1598)

Abstract:
In order to probe into the stability of train’s balancing speed under the condition of air brake,the relationship between its balancing speed and the monotonicity of the function of train unit resultant force was investigated.When the function of train unit resultant force is monotonously decreasing...

Influence of Shape Misalignment of Wheelsets on Stability of Vehicle System

CHI Maoru, ZHANG Weihua, JIN Xuesong, ZHU Minhao

2008, 21(5): 621-625.

[Abstract](1731)

Abstract:
A dynamics model for a vehicle with the shape misalignment of wheelsets was set up,and the influence of the shape misalignment on the critical vehicle speed was analyzed by a numerical simulation.The simulation result shows that the stability of vehicle systems can be parted into easy-stable region,...

Optimization of Comprehensive Performance of Planar Redundant Parallel Manipulator

LIU Xin, QIU Yuanying, SHENG Ying, LI Junhua

2008, 21(5): 626-632.

[Abstract](1707)

Abstract:
The optimization of comprehensive performance of a planar 2-DOF(degree-of-freedom) redundant parallel manipulator was investigated.Based on the kinematics model of the manipulator,its Jacobian matrix and optimal topologies were given.The influences of structural parameters of the manipulator on its ...

Formation and Strengthening Mechanisms of Plasma Sprayed Nanostructured WC-Co Coating

CHEN Hui, GOU Guoqing, LIU Yan, TU Mingjing

2008, 21(5): 633-637.

[Abstract](1403)

Abstract:
Nanostructured and conventional WC-Co coatings were prepared by plasma spray to investigate the formation and strengthening mechanisms of the nanostructured coatings.The results indicate that typical nanostructures exist in the nanostructured coating.The sub-particles of 2-5 nm in size dispersing in...

Dynamic Tensile Properties of High Strength Fiber Bundles

WANG Tinghui, SONG Shuncheng, WANG Mingchao, SUN Zhijie, ZHANG Zuoguang

2008, 21(5): 638-642.

[Abstract](1380)

Abstract:
The dynamic tensile properties of 5 types of high strength fiber bundles(PBO,UHMWPE,Kevlar,Glass fiber S-2,and Basalt) were measured using a dynamic tensile test device and a combination clamp with thin-walled bars.The comparison between the dynamic tensile and the static properties shows obvious st...

Integrated Framework of Collaborative Commercial Platform for Manufacturing Industrial Chain

WANG Shuying

2008, 21(5): 643-647.

[Abstract](1509)

Abstract:
An integrated framework of collaborative commercial platform for manufacturing industrial chains was proposed based on an analysis on the collaborative characteristic of enterprises in manufacturing industrial chains.A software bus was designed based on common basic components following aspect orien...

Model Test of Corbel Cracking and Reinforcement of Urban Overpass

PU Qianhui, GOU Hongye, ZHANG Junhua

2008, 21(5): 648-653.

[Abstract](1689)

Abstract:
In order to ensure the safe operation of urban overpasses,model tests of corbel cracking and reinforcement of the main bridge and ramp bridge of Niulong road overpass in Chengdu City were carried out respectively.By controlling the region,shape and size of cracks,corbel cracking of the overpass was ...

Topology Optimization of Structure Based on Modified Balanjin Theory

ZHANG Jinfang, ZHAO Renda, XIANG Tianyu

2008, 21(5): 654-659.

[Abstract](1762)

Abstract:
In order to seek a new structural optimization method with engineering practicability,the evolutionary structural optimization(ESO) was applied to the topology optimization of structures based on a stress level.Through modifying the Balanjin theory,the stress level of elements was measured by the ra...

Fatigue Load for Semi-rigid Connection of Rail Floor Beam of Long-Span Steel Truss Arch Bridges

WEI Xing, LI Jun, QIANG Shizhong, LIU Dejun

2008, 21(5): 660-665.

[Abstract](1624)

Abstract:
In order to estimate the fatigue damage accumulation of semi-rigid connection between the rail floor beam and truss of a steel truss arch bridge bearing light rail transit and highway vehicle loads,fatigue load spectrum,produced due to traffic loads in the designed service life of the bridge,for the...

Analysis of Factors Influencing Longitudinal Force of Welded Turnout on Simply Supported Beam Bridge

YANG Rongshan, LIU Xueyi, WANG Ping

2008, 21(5): 666-672.

[Abstract](1599)

Abstract:
Based on the characteristic of longitudinal interaction of welded turnout on a bridge,a finite element model for welded turnout-bridge-platform was established.By taking No.18 welded turnout on a simply supported beam bridge as an example,factors influencing its longitudinal force and displacement w...

Sensitivity Analysis of Geoelectric Parameters in Transient Electromagnetic Method for Tunnels

TAN Daiming, QI Taiyue

2008, 21(5): 679-684.

[Abstract](1868)

Abstract:
In order to investigate the characteristics of a transient electromagnetic field in tunnels using the transient electromagnetic method for advanced detection,the propagation characteristics of transient electromagnetic fields in an underground whole-space and in a layered half-space were respectivel...

Compressive Stability of Continuous-Slab-Track on Long-Span Bridge

LIN Hongsong, LIU Xueyi, YANG Rongshan

2008, 21(5): 673-678.

[Abstract](1153)

Abstract:
To research the compressive stability measures of continuous-slab-track on a long-span bridge,based on its structural and longitudinal mechanical features a finite element model for slab-bridge-pier was established by taking a prestressed concrete continuous rigid frame bridge with a span of 94 m+16...

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2008 Vol. 21, No. 5