西南交通大学学报

Algorithm for Power Flow of Electric Traction Network Based on Equivalent Circuit of AT-Fed System

HE Zhengyou, FANG Lei, GUO Dong, YANG Jianwei

2008, 21(1): 1-7.

[Abstract](1624)

Abstract:
An improved algorithm based on equivalent circuit of autotransformer-fed(AT-fed) systems was proposed to calculate power flows of electric traction networks.In the proposed algorithm,locomotives are treated as a constant power model,and the leakage impedance of ATs is considered.Power flows when the...

Partial DC Variable Elimination Method for Calculation of AC/DC Power Flow

ZHUANG Huimin, XIAO Jian, HUANG Yanquan

2008, 21(1): 8-13.

[Abstract](1381)

Abstract:
A partial DC variable elimination method for calculation of AC/DC power flow was proposed to overcome the main disadvantages of the existing unified iterative methods.In its computational model,the converters are treated as PQ-loads that depend on the control angles and the voltages on the AC side.T...

Effects of Typical Defects on Electrical Fields in High-Voltage (Storage) Capacitors

ZHANG Xueqin, WU Guangning, LI Xiaohua, BIAN Shanshan

2008, 21(1): 14-18.

[Abstract](1615)

Abstract:
Four typical defects,that is,inner,contact,overlap and oil defects,were modeled based on the insulation structure and its working environment in high-voltage storage capacitors.Two dimensional axisymmetric electrical fields were analyzed with finite element method.The results show that the electrica...

Random Early Detection Algorithm of Self-similar Traffic

TAN Xianhai, HUANG Yuanhui, JIN Weidong

2008, 21(1): 19-24.

[Abstract](1385)

Abstract:
A random early detection(RED) algorithm of self-similar traffic with self-similar traffic input can improve the effectiveness of network congestion control by taking the characteristic of traffic into account.Setting of parameters for the RED algorithm was investigated.Based on the characteristic of...

Optimized Design and Implementation of HDB3 Encoder and Decoder

ZHANG Qiaowen, ZHU Zhongjie, LIANG Feng, DAI Yingjun

2008, 21(1): 25-28,76.

[Abstract](1417)

Abstract:
To solve the drawbacks of the existing HDB3(high density bipolar 3) encoders, such as high encoding complexity and long output delay,a fast design method for HDB3 encoders based on block encoding,unified polarity judgment and position polarity judgment was proposed.As a result,a fast design method f...

Algorithm for Implicit Surface Reconstruction from Point Cloud Data with Noises

YANG Jun, ZHU Changqian

2008, 21(1): 29-34.

[Abstract](1443)

Abstract:
An algorithm for reconstructing surfaces from point clouds with noises and outliers acquired with a 3D scanner was presented.In the algorithm,each point is shifted using a filtering operator based on mean shift scheme to the local maximum of kernel density function to suppress noises and remove the ...

Improvement on CK Metrics Suite for Object-Oriented Software

LI Xiaohang, HU Xiaopeng

2008, 21(1): 35-39.

[Abstract](1188)

Abstract:
To overcome the shortcomings of CK suite in terms of its metrics,such as WMC(weighted methods per class),DIT(depth of inheritance tree),and LCOM(lack of cohesion in methods) for object-oriented software,an improved CK(ICK) suite was proposed.In the ICK suite,weighted method argument complexity per c...

Factors Influencing Porformances of Hydraulic Anti-sway System for Container Cranes

CHENG Wenming, ZHONG Bin, MA Lili, WU Xiao

2008, 21(1): 40-44.

[Abstract](1678)

Abstract:
To analyze the main factors and key parameters affecting the performances of the hydraulic anti-sway system for container cranes,simplified system dynamic equations were derived to meet practical requirements on the basis of structural characteristic of the anti-sway system and its trolley-load syst...

Design of Dispatching Platform for Development of Virtual Prototype of Rolling Stocks

ZOU Yisheng, DING Guofu, ZHANG Weihua, LIU Jia

2008, 21(1): 45-50.

[Abstract](1667)

Abstract:
To coordinate members and tasks in a team,and manage different types of data for development of virtual prototype of rolling stocks,a dispatching platform was designed and implemented.Two-level protections,systematic and project-based,were used to ensure safety of the system.The principle of PDM(pro...

Thermoelastic Stresses Due to Wheel-Rail Contact in Pure Sliding State

ZHAO Xin, JIN Xuesong, WEN Zefeng, WU Lei

2008, 21(1): 51-56.

[Abstract](1619)

Abstract:
A finite element method was applied to establish a thermal-mechanical coupling model for wheel-rail contact in pure sliding state.The non-steady heat conduction between the contacting surfaces of wheel-rail,heat-convection and radiation between the wheel-rail and the ambient were considered.Analysis...

Globally Exponential Stability of Dynamic Neural Networks with Distributed Delays

ZHANG Keyue, REN Dianbo, ZHANG Jiye

2008, 21(1): 57-61.

[Abstract](1729)

Abstract:
The existence,uniqueness and globally exponential stability of the equilibrium point of a dynamic neural network with distributed delays were studied without assumption of boundedness and differentiability of activation functions.Sufficient criteria for existence,uniqueness and global exponential st...

Flutter of Delta Wing under Aerodynamic Heating

YE Xianhui, YANG Yiren

2008, 21(1): 62-66.

[Abstract](1276)

Abstract:
From the characteristics of aerothermoelasticity,the effects of temperature in aerodynamic heating on the mode of a delta wing and the characteristic of its flutter were researched.The temperature distribution of the delta wing under aerodynamic heating was investigated with flux balance equation,an...

Simulation of SHPB Test on Concrete and Uniformity of Stresses

CAO Jixing, CHEN Qiu, ZHANG Jiping

2008, 21(1): 67-70.

[Abstract](1946)

Abstract:
Split Hopkinson pressure bar(SHPB) tests on C100 and C80 concrete specimens were simulated with explicit dynamic finite element software LS-DYNA.The concrete specimens were simulated with the Johnson-Holmquist-concrete constitutive model.The stress-strain curves obtained by simulation are in good ag...

Experimental Investigation on Flexural Behavior of Prestressed Concrete-Filled Steel Box Beam

ZHAN Yulin, ZHAO Renda, XIE Bangzhu, MOU Tingmin, FAN Bikun

2008, 21(1): 71-76.

[Abstract](1529)

Abstract:
An experiment was conducted on 8 prestressed concrete-filled steel box beams to investigate the flexural behavior of prestressed concrete-filled steel box beams.The test parameters include concrete strength,steel strength,prestressing degree,steel ratio and loading pattern.The strain distribution of...

Modification of Tension Field Theory on I-girder Web

KANG Xiaoxian, QIANG Shizhong

2008, 21(1): 77-81.

[Abstract](1564)

Abstract:
To take the restraint provided to I-girder webs by the flange and the initial imperfection of structure into account,the advantages and disadvantages of the Basler tension field theory and the Rockey tension field theory were discussed based on a comparison between the nonlinear FEM(finite element m...

FEM Simulation of Straightening Tongue Rail of High-Speed Turnout

ZHOU Wen, LIU Xueyi

2008, 21(1): 82-85,95.

[Abstract](1719)

Abstract:
To provide a theoretic reference for straightening the tongue rail of high-speed turnouts,a finite element model for tongue rail was proposed using three dimensional solid finite elements.The effects of loading distance,loading mode and loading value on the plastic deformation,stress and lineshape o...

Wheel/Rail Contact Irregularity in Crossing Zone of High-Speed Turnout

CAI Xiaopei, LI Chenghui

2008, 21(1): 86-90.

[Abstract](1472)

Abstract:
To identify the characteristics of wheel/rail contact irregularity in crossing zone of high-speed turnouts,a numerical model was set up based on the least distance searching method and analyzing the structures of point rail and wing rail. The law of wheel/rail contact irregularity induced by differe...

Model and Algorithm for Estimation of Wagon Flow of Stage Operating Plan Based on Break-up and Make-up Sequences

WANG Zhengbin, DU Wen, WU Baiqing, YANG Yan

2008, 21(1): 91-95.

[Abstract](1614)

Abstract:
In order to realize automational dispatch,an estimation model for wagon flow of a stage operating plan for a technical station was established based on the close relationship between the make-up content and source of outbound trains and the sequences of break-up and make-up operations of trains and ...

Forecast of Railway Freight Ton-Kilometers Based on Semi-parametric Regression

WANG Ruyi, WANG Ciguang, GUO Zizheng, TANG Jianqiao

2008, 21(1): 96-100.

[Abstract](1806)

Abstract:
To raise the forecast precision of railway freight ton-kilometers(RFTK),seven factors reflecting the supply capacity of railway transportation were selected out based on a qualitative analysis and the grey relevancy degree theory,and a semi-parametric regression model was established.The partial lea...

Early-Warning Model of Irregular Flight Management Based on Correlation Function in Extension Theory

YAO Yun, ZHU Jinfu

2008, 21(1): 101-106.

[Abstract](1550)

Abstract:
To solve the problem that there is no early-warning technique for conflict management of irregular flight services,the matter element analysis in extension theory was used to build an early-warning model with 5 indices(anticipated delay time,margin of resources,affected passenger number,service abil...

Insertion Heuristic Algorithm for Dynamic Vehicle Routing Problem with Fuzzy Due-Time

ZHANG Jianyong, LI Jun, GUO Yaohuang

2008, 21(1): 107-113.

[Abstract](1569)

Abstract:
In order to effectively solve the dynamic vehicle routing problem with considering the preferences of customers,the traditional static vehicle routing problem with time windows(VRPTW) was expanded to a new situation with dynamic customers,and the time windows were replaced by fuzzy due-time represen...

Variational Inequality Equilibrium Model for Multiclass and Multicriteria Stochastic Traffic Networks with Elastic Demands

XU Bing, ZHU Daoli

2008, 21(1): 114-119.

[Abstract](1614)

Abstract:
An equilibrium model for multiclass and multicriteria stochastic traffic networks with elastic demands was established using variational inequality method under assumptions that the weights of criteria are dependent of classes of travelers, and that cost functions are unsymmetrical.The model general...

Division of Transportation Corridor in Wide Area Network Based on OD Table

LI Degang, BIAN lili, LUO Xia, HUO Yamin

2008, 21(1): 120-124.

[Abstract](1620)

Abstract:
A theory for division of transportation corridor in a WAN(wide area network) was proposed based on the relationship between the whole and a part of the network,and the characteristic that the correlation degree between two regions connected by the corridor decreases as the distance between them incr...

Coordinative and Incentive Mechanisms of One-Shot Cooperation in Supply Chain

LIN Qiang, GU Peiliang

2008, 21(1): 125-130.

[Abstract](1460)

Abstract:
The coordination in a supply chain was analyzed.A cooperation model for the balance of one-shot cooperation was derived following the principal-agents mechanism with the factors influencing profit distribution being known.The results of analyses show that the effort level and the total net profit ar...

Research on Syntheses of PU Microcapsule for Gene Engineering Cell

ZHANG Zhibin, PENG Xuelin, CHEN Huiqing, SHAN Lianhai

2008, 21(1): 131-135.

[Abstract](1330)

Abstract:
Polyurethane(PU) water solutions were synthesized by combining the prepolymerization,chain-extension,neutralization and dispersion-diffluence methods in one step.And PU microcapsules were synthesized with the coacervation phase separation method.The synthetic conditions of PU water solutions and PU ...

Fisher Discrimination Method and Its Application

ZHONG Chong, GUO Qiang

2008, 21(1): 136-141.

[Abstract](1469)

Abstract:
The Fisher discrimination method is a multiple logical probabilistic discrimination method with a wide application and strong discrimination ability to financial risks.Based on the Fisher discrimination method and actual data,a system of discrimination indexes for the financial risks of Chinese univ...

Experimental Investigation on Removal of Organics in Leachate Using Semi-aerobic Aged Refuse

ZHANG Aiping, LIU Dan, SU Yanping, LIU Yong

2008, 21(1): 142-146.

[Abstract](1410)

Abstract:
In order to investigate the removal characteristics and efficiency,semi-aerobic refuse with an age of 3 a in the laboratory was used to remove organics in leachate by filling in bioreactors by perfusion under the conditions of natural ventilation and closed landfilling.The experimental investigation...

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2008 Vol. 21, No. 1