西南交通大学学报

Dynamics and Service Simulation for General Coupling System of High-Speed Trains

ZHANG Weihua, ZHANG Shuguang

2008, 21(2): 147-152.

[Abstract](2179)

Abstract:
A theoretical dynamics framework for the general coupling system of high-speed trains was proposed according to the operational features of high-speed trains and the demand to study dynamics of the high-speed train system.In the framework,the track,catenary and air flows are coupled with the high-sp...

Method of Arrival and Departure Tracks Utilization Plan in Railroad Passenger Station Based on Ant Colony Algorithm

LÜ, Hongxia, HE Dake, CHEN Tao

2008, 21(2): 153-158.

[Abstract](1577)

Abstract:
A 0-1 programming model for utilization of arrival and departure tracks in a railroad passenger station was proposed,and the model was solved by an ant colony algorithm.In the algorithm,the pheromone is expressed with the ratio of the theoretically optimal objective function value to the actual obje...

Optimization for Static Wagon-Flow Allocation in Bidirectional Marshalling Station

XUE Feng, WANG Ciguang, LUO Jian

2008, 21(2): 159-164.

[Abstract](1445)

Abstract:
Definitions such as wagon-flow allocation time spans and feasible wagon-flows, etc,were presented.A bi-level multi-objective decision model was established,in which the objective functions include the total cost for removing wagons to unwanted directions and those without enough time to be transferr...

Method for Calculating Intersection Diversion Ratio Based on Network Equilibrium

CHENG Lin, YU Chunqing, WANG Wei, XU Xiangdong

2008, 21(2): 165-172.

[Abstract](1465)

Abstract:
A method for calculating intersection diversion ratio was proposed to study the influences of space distribution of traffic demands on traffic network bottlenecks.Link proportion,intersection diversion ratio and their relationship were investigated over stochastic user equilibrium networks.On the ba...

Dynamics Simulation and Identification System for Road Accident Black-Spots

SHAO Yiming, HU Yan, YU Zhigang, XU Jin

2008, 21(2): 173-176.

[Abstract](1693)

Abstract:
A whole vehicle model of multi-body dynamics,a road model,and a tire-road surface coupling model were built using the multi-body dynamics analysis software ADAMS.A simulation system for identifying road accident black-spot was obtained based on the three models.Situations of running on a sharp curve...

Mechanism of Run-Off-Road on Horizontal Curves Caused by Collision Avoidance of Vehicles

XU Jin, SHAO Yiming, PENG Qiyuan, CHEN Yongxi

2008, 21(2): 177-181.

[Abstract](1524)

Abstract:
Dynamic responds of a vehicle during collision avoidance were obtained through simulation.The curvatures of the traveling path for collision avoidance of two vehicles running in opposite directions were analyzed according to the lateral forces acting on tires.An excessive additional curvature caused...

Simulation of Flashover Conditions in Passenger Vehicles

LEI Bing, WANG Qingyuan, LIU Yingqing

2008, 21(2): 182-186.

[Abstract](1762)

Abstract:
A flashover model of high temperature smoke layer was derived based on energy conservation functions.A catastrophe potential function,which has the same form of swallowtail catastrophe,was obtained by dimensional normalization and diffeomorphism.The relationship between system control variables and ...

Dynasearch Algorithms for Solving Time Dependent Traveling Salesman Problem

LI Yanfeng, LI Jun, ZHAO Da

2008, 21(2): 187-193.

[Abstract](1539)

Abstract:
A method was proposed to solve the time-dependent traveling salesman problem(TDTSP) happening in more than one time period,and its model was derived.The model was solved with dynasearch algorithms,ds-k-opt(k=2,2.5,3).Simulation results show that some of the ds-2-opt solutions and most of ds-3-opt so...

Vibration Reduction Strategies of Controllable TMD-Hybrid Tanks System

TAN Ping, HUANG Dongyang, DAI Naxin, ZHOU Fulin

2008, 21(2): 194-199.

[Abstract](1646)

Abstract:
Excursions of structures’ frequencies,result from engineering vibration or discrepancies between structures’ actual frequencies and designed ones due to calculation or construction errors,will make the vibration reduction effect of a passive tuned damper drop obviously.In order to improve the detuni...

Earthquake-Induced Added Hydrodynamic Pressure on Circular Hollow Piers in Deep Water

LIU Zhenyu, LI Qiao, ZHAO Chanhui, ZHUANG Weilin

2008, 21(2): 200-205,212.

[Abstract](1912)

Abstract:
Based on the radiation wave theory,a liquid control equation for hollow circular piers was deduced under the condition of free surface wave,the movement boundary condition of bottom water particles,and the continuity condition of structure and water velocities.By applying the variable separation met...

Experimental Investigation on Ductility of U-Section Steel-Encased Concrete Composite Beams

SHI Qiyin, HUANG Zhouyu, LI Aiqun

2008, 21(2): 206-212.

[Abstract](1787)

Abstract:
An experiment was conducted on nine U-section steel-encased concrete composite beams,and the relationships of the ductility of the composite beams and their failure modes were probed into to investigate the ductility of this type of composite beams.From the experimental results,main factors influenc...

Theoretical Model for Estimation of Cutter Head Torque in Shield Tunneling

GUAN Huisheng, GAO Bo

2008, 21(2): 213-217,226.

[Abstract](1388)

Abstract:
In order to provide a theoretical reference for the design and type selection of shield machines,a theoretical model was proposed based on the systematic analysis of cutter head torque in shield tunneling.Formulae of calculating torque components in this model were deduced,and the validity of these ...

Ground Vibration Caused by Moving Metro Trains

HE Zhenxing, ZHAI Wanming, LUO Zhen

2008, 21(2): 218-221,247.

[Abstract](2055)

Abstract:
To study ground vibrations caused by metro trains,a three-dimensional dynamic finite element model was derived with simplifications in tracks,tunnels and loads caused by a running train.A train was composed of 8 cars,and its speed was 80 km/h.The ground vibrations were calculated to analyze the infl...

Stability of Recurrent Cellular Neural Networks with Variable Time Delays

ZHENG Weifan, LONG Lan, ZHANG Jiye, ZHANG Weihua

2008, 21(2): 222-226.

[Abstract](1660)

Abstract:
The global exponential stability of a class of recurrent cellular neural networks with variable time delays was studied using M-matrix theory and vector Lyapunov methods.Without assuming the boundedness,monotonicity,differentiability and Lipschitz continuity of the active functions,an algebraic crit...

Period-Doubling Bifurcation of Single-Degree-of-Freedom Piecewise-Linearity System with Clearance

XU Huidong, XIE Jianhua

2008, 21(2): 227-231.

[Abstract](1429)

Abstract:
The period-doubling bifurcation and chaos of periodic motions of a single-degree-of-freedom piecewise linear system with clearance was studied.The switching matrix for the system was obtained,and the period-doubling bifurcation of periodic motions was analyzed by the Floquet theory.The poincaré map ...

LMI Approach for Delay-Dependent Robust Stability of Interval Neutral Systems

YANG Rui, HUANG Tianmin

2008, 21(2): 232-237.

[Abstract](1519)

Abstract:
The LMI(linear matrix inequality) approach was used to solve the difficulty in calculation with the present approaches for the robust stability analysis of a kind of interval neutral systems.A delay-dependent robust stability criterion in the form of LMIs was obtained by defining a new Lyapunov-Kras...

Calculation of Space Electric Field in Railway Container Center Station and Induced Current of Reach Stacker

WANG Jijian, GAO Bo, YE Qiang, WU Guangning

2008, 21(2): 238-241,274.

[Abstract](1690)

Abstract:
The charge simulation method was applied to calculate the space electric field in railway container center stations to investigate the space electric field caused by the catenary and its effects.An ellipsoidal model for a reach stacker was put forward,and induced current of the reach stacker by the ...

Propagation Equation and Property of Spectral Degree of Coherence of Partially Coherent Flat-Topped Beams

JI Guangming, GE Hong

2008, 21(2): 242-247.

[Abstract](1218)

Abstract:
Based on the Huygens-Fresnel principle,propagation equation for the spectral degree of coherence of partially coherent flat-topped beams propagating in a free space was derived,and the properties of the spectral degree of coherence were investigated numerically.The research shows that the oscillator...

New Carrier Recovery Method for 16-QAM Based on Full Constellation Points

WANG Ping, FAN Pingzhi

2008, 21(2): 248-252.

[Abstract](1082)

Abstract:
To improve the carrier recovery performance of 16-ary quadrature amplitude modulation(16-QAM),the relationship between the transmitted data symbol and the signal phase in the constellation was investigated.Based on the relationship,a new carrier recovery method was proposed.In this method,both the d...

ISO/IEC 9126-Based Web Source Quality Assessment System

ZHU Yan, TANG Huijia, MA Yongqiang

2008, 21(2): 253-257.

[Abstract](1481)

Abstract:
An ISO/IEC 9126-based web source quality assessment system was set up to manage the source quality of web-based information systems.This assessment system consists of a multidimensional and multi-tier web quality model,WebQM(web quality model),web source quality evaluation algorithm,and robustness a...

Optimal Allocation of Network Resource in IntServ

TAN Xianhai, LI Minghui, JIN Weidong

2008, 21(2): 258-263.

[Abstract](1536)

Abstract:
To improve the effectiveness of resource reservation in network admission control,the implementation method and problem of QoS(quality of service) negotiation and resource reservation of IntServ(integrated services) recommended by IETF(Internet Engineering Task Force) were investigated based on the ...

Entanglement Degree During Generation of Quantum Controlled-NOT Gates

ZHANG Miao, JIA Huanyu

2008, 21(2): 264-269.

[Abstract](1667)

Abstract:
Generation of quantum controlled-NOT gates consists of sequentially applying three laser pulses to trapped cold ions.The entanglement dynamics during the generation of quantum controlled-NOT gates and the variation in entanglement degrees with time were analyzed.The results show that there is not en...

Influences of Laser Treatment on Properties of Ni-P Layers Plated on Aluminum Substrates

YANG Yue, YU Chuanying, WANG Jinbo

2008, 21(2): 270-274.

[Abstract](1362)

Abstract:
A Nd-YAG pulsed laser was used to modify electroless plated Ni-P layers on aluminum substrates.The Ni-P layers were successfully modified with a laser power density of 0.515 GW/m2.The modified Ni-P layers exhibit smoother surface,better bonding strength with the substrate,and better corrosion resist...

Numerical Simulation for Solid-State Sintering Processes of Alumina Ceramic Powders

SONG Jiupeng, BARRIERE Thierry, LIU Baosheng, GELIN Jean-Claude

2008, 21(2): 275-279.

[Abstract](1885)

Abstract:
Uniaxial shrinkages and shrinkage rates of alumina powder injection molding components in sintering process were measured by a dilatometer.Based on experimental data,an algorithm for parameter identification was designed to determine the uniaxial viscosity and sintering stresses in the sintering mod...

Tribological Properties of CrN Coatings Prepared by Physical Vapor Deposition

MO Jiliang, ZHU Minhao

2008, 21(2): 280-284.

[Abstract](1390)

Abstract:
Two kinds of CrN coatings were deposited on cemented carbide substrates by filtered cathodic vacuum arc(FCVA) and multi-arc ion plating(MAIP),and their tribological properties were compared on a CETR UMT-2 tribometer under reciprocating sliding.X-ray diffraction(XRD),micro-hardness and nano-indentat...

Spatial Distribution and Contamination of Heavy Metals in Road Dust,Sediment in Roadside Ditch and Roadside Soils along Zhengzhou-Kaifeng Highway

MA Jianhua, LI Jian

2008, 21(2): 285-291.

[Abstract](1427)

Abstract:
To understand the spatial distribution and contamination of heavy metals along roads and roadsides,Zhengzhou-Kaifeng highway,having operated over 40 a,was chosen as the research object.A sampling transect is perpendicular to the highway.Samples were collected on the line of this transect at a specif...

Fuzzy Comprehensive Evaluation for Green Construction

HUANG Xibing, HUANG Qing, WU Xiaofei

2008, 21(2): 292-296.

[Abstract](1686)

Abstract:
In order to evaluate green construction reasonably,an index system was proposed.This index system is composed of five first-level indexes and seventeen second-level indexes.These first-level indexes include land efficiency,energy efficiency,material efficiency,water efficiency and environmental prot...

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2008 Vol. 21, No. 2