西南交通大学学报

Dynamics of Ballastless Track and Its Application

CAI Chengbiao

2007, 20(3): 255-261.

[Abstract](1574)

Abstract:
A coupling dynamic model for train-ballastless track on subgrade was derived based on the vehicle-track coupling dynamics to analyze the dynamic performances of the ballastless tracks and the stiffness of transition tracks.In the model,the tracks are regard as Bernoulli-Euler beams on discrete elast...

Three-Dimensional Elastic-Plastic Rolling Contact Stresses in Rail

GUO Jun, WEN Zefeng, JIN Xuesong, LIU Qiyue

2007, 20(3): 262-268.

[Abstract](1713)

Abstract:
A three-dimensional elastic-plastic model of wheel-rail rolling contact was established by finite element method to investigate the effect of yield stress of rail material on residual stresses and strains in the rail.In the model,the geometry and boundary conditions of the rail were taken into accou...

Uniform White Noise Model for Time-Delay Multi-dimensional Rail Irregularity Excitation

JIN Zhibin, QIANG Shizhong, LI Xiaozhen

2007, 20(3): 269-273.

[Abstract](1600)

Abstract:
To obtain rail irregularity samples for train-bridge vibration control and stochastic analyses,a simulation method of irregularities at all axles of a train was investigated.Rail irregularity at the first axle was generated by the white noise filtration method.To achieve wavelength selection of rail...

Vibration Control of Cables by Cable-Type Dynamic Vibration Absorbers

YANG Suqin, ZHANG Keyue

2007, 20(3): 274-277.

[Abstract](1467)

Abstract:
A cable-type dynamic vibration absorber was presented to control cable vibrations of the predominant modes under harmonic excitations.The controlling cable(dynamic absorbing cable)) and the controlled cable(main cable) are under the same boundary condition,and connected by uniformly distributed spri...

Damage Constitutive Model of Rock Based on Drucker-Prager Criterion

XU Jiang, LI Shuchun, LIU Yanbao, LI Kegang

2007, 20(3): 278-282.

[Abstract](1727)

Abstract:
To overcome the shortcoming of the existing method to establish the damage constitutive model of rock,i.e.,it seeks parameters in the constitutive model by linear fitting after logarithmic transformation to result in a complex calculation and not to fit for computer programming,formulas of calculati...

Analysis of Longitudinal Seismic Response of Shield Tunnel

GENG Ping, HE Chuan, YAN Qixiang

2007, 20(3): 283-287.

[Abstract](1830)

Abstract:
In order to investigate the characteristics of longitudinal seismic response of shield tunnels,the seismic response of a shield tunnel across the Yangtze River in Wuhan was investigated with a three-dimensional finite element model for ground-tunnel interaction.The investigation mainly concerns the ...

Shell-Spring-Contact Model for Load and Structure Interaction

SU Zongxian, HE Chuan

2007, 20(3): 288-292,304.

[Abstract](1734)

Abstract:
In order to probe into the 3D mechanical behaviors of shield tunnel segmental linings,a shell-spring-contact model for load and structure interaction was set up by using thick shell,spring,solid and contact elements to analyze forces acting on shield tunnel segments.Several special features were con...

Parametric Investigation of Ultimate Bearing Capacity of Reinforced Concrete Arch Bridges

LI Song, QIANG Shizhong, TANG Ying

2007, 20(3): 293-298.

[Abstract](1642)

Abstract:
Based on the collapse theory and a 3D numerical simulation model,the ultimate bearing capacity of reinforced concrete arch ribs was calculated to accurately determine the ultimate bearing capacity of a long-span reinforced concrete arch bridge.In this research,the effects of geometric nonlinearity,m...

Shear Lag Effect of Continuous Curved Box Girder with Different Types of Support

LOU Yihong, LUO Qizhi, DU Jiabin, LI Yongkai

2007, 20(3): 299-304.

[Abstract](1380)

Abstract:
Based on the homogeneous solutions of equilibrium differential equations for shear lag as the displacement patterns of finite segment,a finite segment model taking bending,torsion and shear lag into consideration was established.A corresponding program was designed to calculate the shear lag of cont...

Relationship between Distance Headway and Chaos in Traffic Flow on Expressway

LI Song, HE Guoguang, ZHANG Jie

2007, 20(3): 305-309.

[Abstract](1572)

Abstract:
The relationship between distance headway and chaos in traffic flow on expressway was investigated in order to analyze the formation mechanism of chaos in traffic flow.An improved algorithm for largest Lyapunov exponent was put forward for rapid identification of chaos in traffic flow.The chaos in t...

Stochastic User Equilibrium Assignment Based on Traffic State

WANG Jianling, JIANG Yangsheng, PU Yun

2007, 20(3): 310-314.

[Abstract](1608)

Abstract:
Based on the basic idea of stochastic user equilibrium assignment and the traffic flow theory,the concept of road traffic state was introduced in order to describe the problem of traffic assignment.The road traffic state was defined as the linear weighted sum of travel time and traffic congestion de...

Optimal Routing Algorithm for Public Traffic Network Based on Matrix Analysis

HE Di, YAN Yusong, GUO Shoujing, HAO Guang

2007, 20(3): 315-319.

[Abstract](1558)

Abstract:
In order to tally with the actual situation further,i.e.,transfer times are a determining factor and travel time is an important factor in passengers’ choice of a route in a public traffic network,the psychological characteristics of passengers were analyzed,a public traffic network model based on G...

Revenue Optimization of Capacity Scheme and Allocation of Third Party Warehousing

LIN Chang, HUANG Qing, BU Xiangzhi

2007, 20(3): 320-325.

[Abstract](1629)

Abstract:
Based on the principle of revenue management,capacity scheme and allocation under a stochastic market demand was investigated in order to maximize the revenue of third party warehousing.A stochastic model was established,and robust optimization was used to the stochastic variables so as to turn the ...

Research on Buy-Back Contract Mechanism of Brand Specialization Supply Chain

ZHAO Zhengjia, HE Hui

2007, 20(3): 326-329.

[Abstract](1312)

Abstract:
To obtain the optimal policy of a brand specialization supply chain with a supplier and a retailer,a buy-back policy model under a stochastic price-dependent demand was proposed,and a buy-back contract based on a linear price-discount sharing scheme was analyzed.The analysis shows that under a linea...

Improved Models of Rough Set Decision-Making and Cluster Analysis

LIU Dun, HU Pei, CHEN Zhijie

2007, 20(3): 330-334.

[Abstract](1476)

Abstract:
By analyzing the intrinsic relationship between the rough set theory and the cluster analysis,their syncretized mechanism was investigated and the correlative mathematical demonstrations were given.Owing to the fact that it is difficult to build a decision table in rough set decision-making,a new co...

Taxonomy of Replay Attacks on Security Protocols Based on Attack Hierarchy

TAO Hongcai, HE Dake

2007, 20(3): 335-339.

[Abstract](1384)

Abstract:
A taxonomy of replay attacks based on attack hierarchy was defined on four levels of attacks on cryptographic protocols,i.e.message block,inter-block inside step,inter-steps,and inter-protocols.The taxonomy not only contains the Syverson taxonomy of replay attacks,but also extends the replay attack ...

Safety of Facial Images Based on Fragile Digital Watermarking

ZHANG Zutao, ZHANG Jiashu, HE Hongjie

2007, 20(3): 340-344.

[Abstract](1684)

Abstract:
Fragile digital watermarking for facial image authentication was applied to oppose various attacks to facial images,such as tamper,substitution and addition and to improve the security of facial images.The water mark is obtained by converting the 7 most significant bits(MSB) of the low-frequency wav...

Fast H.264/AVC Intra-Prediction Using Frequency Domain Features

WANG Zhengning, PENG Qiang, ZHU Changqian

2007, 20(3): 345-351.

[Abstract](1322)

Abstract:
To reduce the intra-prediction complexity in H.264/AVC,a fast intra-prediction mode selection algorithm was proposed.It calculates the DCT(discrete cosine transform) coefficients for each block,and uses frequency domain features of the target block to eliminate the majority of candidate modes.Simula...

Effect of Dielectric Anisotropy on Optoelectric Characteristics of Ferroelectric Liquid Crystal

WANG Mengyao, PAN Wei, LUO Bin, ZHANG Weili, ZOU Xihua

2007, 20(3): 352-357.

[Abstract](1422)

Abstract:
A circuit model of ferroelectric liquid crystal(FLC) was proposed to study the effects of biaxial anisotropy on switching time,characteristic time,characteristic voltage and polarization reversal current,and those of ferroelectric torque and dielectric torque on light transmittance.The results indic...

Transmission Characteristics of Optical Pulses in LOA Based on XGM

LI Haitao, PAN Wei, LI Xi

2007, 20(3): 358-362.

[Abstract](1414)

Abstract:
A theoretical model describing transmission of optical pulses in a linear optical amplifier(LOA) was derived to verify the performances of a linear optical amplifier(LOA).Under the condition of gain saturation,the effects of cross-gain modulation(XGM) on transmission pulses and the transmission char...

Active and Passive Compound Vibration Control Based on Optical-Electric Displacement Detection

ZHANG Daxing, JIA Jianyuan, DUAN Yabo

2007, 20(3): 363-366,372.

[Abstract](1610)

Abstract:
Position sensitive detector(PSD) was adopted as the vibration detection sensor,which,compared with an acceleration transducer,can improve measurement precision,reduce the response time,and minimize the influence of time delay.The dynamic model of active and passive compound vibration control was der...

Emission Limits to Harmonics of Electrified Railway

XIE Shaofeng, LI Qunzhan

2007, 20(3): 367-372.

[Abstract](1735)

Abstract:
The impact of harmonic impedance on the relationship between harmonic voltage and harmonic current emission limits was discussed based on a comparison between IEC 61000-3-6 and GB/T 14549-93.There exist differences between traction loads and general loads in determination of the agreed power of the ...

Automatic Classification of Radar Emitter Signals Based on Cascade Feature Extractions

PU Yunwei, JIN Weidong, HU Laizhao

2007, 20(3): 373-379.

[Abstract](1743)

Abstract:
A scheme of automatic classification of radar emitter signals was presented,which is based on cascade feature extractions.First,an improved instantaneous autocorrelation algorithm is performed to extract instantaneous frequencies of typical radar emitter signals.Then,the extracted instantaneous freq...

Algorithm for GPS Network Construction Based on Spherical Delaunay Triangulated Irregular Network

ZHOU Letao, HUANG Dingfa, LI Chenggang, ZHOU Dongwei

2007, 20(3): 380-383.

[Abstract](1576)

Abstract:
A fast growth algorithm for GPS(global positioning system) network construction was developed based on the characteristics of maximized dihedral angle of SDTIN(spherical Delaunay triangulated irregular network).The coordinates,as test data,of GPS sites of ITRF(international terrain reference frame) ...

Weightable and Regular Independent System

LIU Xiufeng, ZHANG Aili

2007, 20(3): 384-388.

[Abstract](1163)

Abstract:
Two combinatorial structures of regular and weightable independent systems were established based on the general cases of multi-key problems.It was proved that a weightable independent system does not contain any inconsistent sets,the independent system without inconsistent sets is the regular indep...

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2007 Vol. 20, No. 3