西南交通大学学报

Aerodynamic Analysis on Entrance Hood of High Speed railway Tunnels

LI Renxian, GUAN Yongjiu, ZHAO Jing, ZHAO Jiwei

2012, 25(2): 175-180. doi: 10.3969/j.issn.0258-2724.2012.02.001

[Abstract](1806)

Abstract:
Based on computational fluid dynamics method, the effects of tunnel entrance hood structure to aerodynamic influence in tunnel were analyzed by numerical simulation as high speed train running into tunnels. The influences of some structure factors were calculated, such as length of transition sectio...

Calculation Method for Embedded Continuous Pile-Board Structure under Thermal Stresses

SU Qian, BAI Hao, HUANG Junjie, LI Xing

2012, 25(2): 181-186. doi: 10.3969/j.issn.0258-2724.2012.02.002

[Abstract](1645)

Abstract:
In order to probe into the method to calculate the temperature effect of an embedded continuous pile-board structure, a concept of temperature effect-based zoning was put forward and a model for the temperature effect was established after analyzing the calculation method for the temperature effect ...

DEM Simulation of Ballast Degradation and Breakage under Cyclic Loading

, JING Guoqing, , FENG Kun, GAO Liang, WANG Jun

2012, 25(2): 187-191. doi: 10.3969/j.issn.0258-2724.2012.02.003

[Abstract](1483)

Abstract:
In order to reflect the micro-mechanism of ballast-sleeper interaction and the process of ballast breakage, a 3-D ballast-sleeper model based on the discrete element method (DEM) was established, and ballast degradation and breakage under cyclic loading were simulated. In this model, irregular balla...

Damping Characteristics of Ballast Mat on Culvert

LI Peigang, LIU Xueyi, HAO Yuanxing

2012, 25(2): 192-197. doi: 10.3969/j.issn.0258-2724.2012.02.004

[Abstract](1425)

Abstract:
In order to provide a theoretical basis for the design and optimization of ballast mat on railway culvert, a vertical coupling dynamical model for a vehicle-track-culvert system was established based on the wheel-rail coupling dynamics theory and the finite element method. LS-DYNA, a large-scale dyn...

Influencing Factors of Adjustment Quantity of Vertical Track Profile Irregularity

WEI Xiankui, QUAN Shunxi, WANG Ping

2012, 25(2): 198-203. doi: 10.3969/j.issn.0258-2724.2012.02.005

[Abstract](1829)

Abstract:
In order to probe into the relationship between practical adjustment quantity and calculated adjustment quantity of vertical track profile irregularity, a calculation method for adjustment quantity of vertical track profile irregularity was put forward, and a coupling calculation model of rail-faste...

Field Tests of Soft Marine Clay Foundation Reinforced by T-shaped Bidirectional Dry Jet Mixing Piles

XIE Shenghua, 2, LIU Songyu, DU Guangyin

2012, 25(2): 204-209. doi: 10.3969/j.issn.0258-2724.2012.02.006

[Abstract](1483)

Abstract:
In order to overcome disadvantages of the marine soft soil foundation treated by the conventional dry jet mixing(DJM) piles, such as mixing non-uniformity of soil cement and low strength of pile body, a technique of using T-shaped bidirectional DJM piles was proposed to reinforce the soft marine cla...

Aerodynamic Characteristics of Vehicle-Bridge System under Cross Wind: Parameter Studies Based on Wind Tunnel Test

LI Yongle, HU Peng, ZHANG Mingjin, 2, XU Youlin

2012, 25(2): 210-217. doi: 10.3969/j.issn.0258-2724.2012.02.007

[Abstract](1646)

Abstract:
In order to investigate the effects of vehicle motion on the aerodynamic characteristics of a vehicle-bridge system, a three-vehicle model and a single-vehicle model respectively for full-scale rail transit vehicles and road transit vehicles were designed to measure the aerodynamic forces acting on ...

Mitigation Measures of Vortex-Induced Vibration of Suspension Bridge Based on Section Model Test

SUN Yanguo, LIAO Haili, LI Mingshui

2012, 25(2): 218-223. doi: 10.3969/j.issn.0258-2724.2012.02.008

[Abstract](1778)

Abstract:
In order to investigate the vortex-induced vibration performance of long-span suspension bridges and propose effective mitigation measures, a long-span suspension bridge with steel-box girder was taken as an engineering example. By a section model wind tunnel test with a scale of 1∶20, the effects o...

Numerical Simulation for Diffraction around Large-Diameter Circular Cylinder Subjected to Three-Dimension Wave

, ZHU Bing, SONG Suidi, TAN Changjian

2012, 25(2): 224-229. doi: 10.3969/j.issn.0258-2724.2012.02.009

[Abstract](1326)

Abstract:
In order to research interaction between three-dimensional waves and structures, a numerical model for the interaction of three-dimensional waves and a structure was established based on the concept of two-phase flow, the volume of fluid (VOF) method and incompressible viscous fluid equations in lar...

THE DAMAGE-COUPLED TIME-DEPENDENT MULTIAXIAL THEORETICAL MODEL: II. THE ENGINEERING APPLICABILITY OF FINITE ELEMENT IMPLEMENTATION

, GAO Qing

2012, 25(2): 230-235. doi: 10.3969/j.issn.0258-2724.2012.02.010

[Abstract](1789)

Abstract:
A damaged-coupled time-dependent fatigue failure model was implemented into the finite element code ABAQUS via user material subroutine UMAT, and typical numerical examples were used to simulate the low cycle fatigue (LCF) failure behavior of 63Sn-37Pb solder alloy structural specimen under nonpropo...

Melting Behaviors of Capric Acid in Rectangular Enclosure

YUAN Yanping, CAO Xiaoling, BAI Li, YANG Xiaojiao

2012, 25(2): 236-240. doi: 10.3969/j.issn.0258-2724.2012.02.011

[Abstract](1572)

Abstract:
An enthalpy-porous model was used to simulate the melting behaviors of capric acid in a rectangular enclosure with a heated wall on one side. The simulation accuracy was verified by comparing the simulated results with those by experiment. The simulation results showed that average Nusselt number an...

Robust Multi-objective Optimization Design of Two-Tooth Difference Rolling Movable Teeth Transmission

LIANG Shangming, SUN Qiang, YAO Jin

2012, 25(2): 241-245. doi: 10.3969/j.issn.0258-2724.2012.02.012

[Abstract](1649)

Abstract:
To improve the design of two-tooth difference rolling movable teeth transmission, a mathematical model of multi-objective robust optimization design for the transmission was established by optimization design theory and robust design method, taking account of the effect on the feasible region caused...

Transformation Effect During Controlled Cooling of X65 Heavy Pipeline Plate

, LU Jiansheng, SONG Peng, Lu Jianguo,

2012, 25(2): 245-251. doi: 10.3969/j.issn.0258-2724.2012.02.013

[Abstract](1671)

Abstract:
To study the phase transformation effect during the controlled cooling of X65 heavy pipeline plate, a thermomechanical coupled finite element model was established, where the developed linear mixture thermal expansion model, the modified Avrami transformation dynamics model, and the Leblond model we...

Effects of Particle Shape on Friction Mechanism Based on Discrete Element Method

DU Xin, ZENG Yawu, GAO Rui, YAN Jing, CAO Yuan

2012, 25(2): 252-257. doi: 10.3969/j.issn.0258-2724.2012.02.014

[Abstract](1367)

Abstract:
In order to reveal the effects of particle shape on friction mechanism, frictions among non-viscous particles were decomposed into the macro biting-force and the mesoscopic biting-force. Impact and angle-of-repose (AOR) numerical tests were conducted to study the effects of particle shape on macro b...

Synchronization Control of Electro-hydraulic Servo System Based on Single Neuron

JIANG Xiaoxia

2012, 25(2): 258-264. doi: 10.3969/j.issn.0258-2724.2012.02.015

[Abstract](1630)

Abstract:
In order to probe into the synchronization control of an electro-hydraulic servo system, a large platform with four hydraulic cylinders was taken as the research object, and the four hydraulic cylinders were identified mathematically with experiment data, and the adaptive neuron technique was employ...

Energy-Saving Optimal Control of Following Trains Based on Genetic Algorithm

LU Qiheng, FENG Xiaoyun, WANG Qingyuan

2012, 25(2): 265-270. doi: 10.3969/j.issn.0258-2724.2012.02.016

[Abstract](1695)

Abstract:
In order to study the optimum operating strategy for energy saving of the following train in a following operation, the static speed constraints of the trains and the dynamic speed constraints of the following train were put forward under a four-aspect fixed autoblock system. On this basis, an energ...

Robust Rudder Roll Stabilization of Guaranteed Attractor

TU Jianjun, 2, HE Hanlin

2012, 25(2): 271-278. doi: 10.3969/j.issn.0258-2724.2012.02.017

[Abstract](1455)

Abstract:
In order to meet the requirements of single input in designing the stabilizing controller for ships with single rudder or linked twin rudders and make the controller robust to ocean wave disturbance, a concept of guaranteed attractor disturbance rejection was presented for a class of system with per...

Building Modes of Integrative Passenger Rail Transit System

HE Dong, ZHU Jianmei

2012, 25(2): 279-284. doi: 10.3969/j.issn.0258-2724.2012.02.018

[Abstract](1339)

Abstract:
To meet the increasing demand for passenger rail transit system from city development and passenger travel, a concept of integrative passenger rail transit system (IPRTS) was defined for the generalized system including railway and urban rail transit, and the disadvantages of the traditional stoppin...

Spot Speed Prediction Model Based on Grey Neural Network

WU Zhizhou, FAN Yujie, MA Wanjing

2012, 25(2): 285-290. doi: 10.3969/j.issn.0258-2724.2012.02.019

[Abstract](1385)

Abstract:
To overcome the detecting data error due to the temporal and spatial instability of traffic condition and improve the accuracy of spot speed prediction, a spot speed prediction model based on grey neural network was developed on the basis of grey prediction model and BP(back propagation) neutral net...

Path Optimization in Stochastic and Time-Dependent Networks with Multi-attributes

CHEN Jingrong, YU Jianning, LI Yinzhen

2012, 25(2): 291-298. doi: 10.3969/j.issn.0258-2724.2012.02.020

[Abstract](2827)

Abstract:
In order to improve the real-time traffic guidance, all the attributes for each section were defined as discrete random variables with respect to time in the light of the stochastic and time-dependent properties of attributes of sections in traffic networks. Based on the above, a model of path optim...

Safety Analysis of Car Drivers' Fixation Characteristics on Freeways

HU Jiangbi, WANG Weili, ZHANG Shouran

2012, 25(2): 299-305. doi: 10.3969/j.issn.0258-2724.2012.02.021

[Abstract](1328)

Abstract:
In order to provide a theoretical basis for the design and operational safety evaluation of freeways, 453 combined alignment sections of a four-lane two-way freeway were selected to study the dynamic visual fixation points on pavements of 13 drivers according to drivers' fixation characteristics in ...

Formalization and Goodness-of-Fit Analysis of Web Quality Model

ZHU Yan, ZHAO Bo

2012, 25(2): 306-312. doi: 10.3969/j.issn.0258-2724.2012.02.022

[Abstract](1285)

Abstract:
In order to rationally standardize the proposed web quality model (WebQM) and verify the feasibility and effectiveness of the model in actual web quality assessment, WebQM was formalized in the ISO/IEC Z language and studied empirically based on the structural equation model (SEM) approach. By build...

Fast Search of Multi-channel Mass Data Based on Optimal Entropy Matching

ZHANG Limei, LIU Lu

2012, 25(2): 313-317. doi: 10.3969/j.issn.0258-2724.2012.02.023

[Abstract](1305)

Abstract:
In order to obtain the data corresponding to certain condition or status from mass test data quickly and accurately, the problems existing in conventional time-sequence search methods were analyzed, and a fast search approach for multi-channel mass data was proposed based on optimal entropic matchin...

Optimization of Time Parameters in Static Segment in FlexRay Network

WANG Gang, RONG Jian, DING Tianbao

2012, 25(2): 318-324. doi: 10.3969/j.issn.0258-2724.2012.02.024

[Abstract](1577)

Abstract:
In order to achieve the maximum network bandwidth utilization of FlexRay bus, the payload length in a FlexRay static frame was optimized. Based on a present optimization model for the static segment in a FlexRay network and by simplifying a nonlinear operator to a linear one, an analytical expressio...

Dynamic Characteristics of Typical Hydraulic Notches

CHEN Jinshi, LIU Xinhui, YUAN Wanrong, WANG Tongjian, ZHAO Feng

2012, 25(2): 325-332. doi: 10.3969/j.issn.0258-2724.2012.02.025

[Abstract](1737)

Abstract:
In order to improve the performance of a hydraulic system and select proper notches of a hydraulic control valve, mathematical models for flow areas of five typical hydraulic notches were established, and corresponding simulation models were set up based on software AMESim. The effects of input sign...

Location-Allocation Model of Logistics Distribution Network of Fast Fashion Products in Mature Period

LIU Sijing, ZHANG Jin, LI Guoqi

2012, 25(2): 333-340. doi: 10.3969/j.issn.0258-2724.2012.02.026

[Abstract](1811)

Abstract:
In order to solve the logistics network location-allocation problem of fast fashion products in mature period of e-commerce retailing, a multi-period non-liner mixed integer programming model was proposed for the fast fashion products' logistics distribution network consisting of four parties and fo...

Integrated Evaluation for Operation Performance of Air Traffic Control in Terminal Area

HU Minghua, LIU Weidong

2012, 25(2): 341-347. doi: 10.3969/j.issn.0258-2724.2012.02.027

[Abstract](1664)

Abstract:
An evaluation method for operation performance of terminal control at a single-runway airport was proposed by integrating principal component analysis and K-means cluster analysis. The Chengdu terminal area with a single runway was taken as an example of application of the proposed method. According...

Optimization Model for Area Traffic Flow Management under Constraint of Deterministic Airspace Capacity

p style, ZHANG Ying, XIE Hua, HU Minghua

2012, 25(2): 348-354. doi: 10.3969/j.issn.0258-2724.2012.02.028

[Abstract](1410)

Abstract:
To solve area air traffic congestion problems, an integer programming model based on time-based metering for area traffic flow management was built. The optimization objectives of the model are minimizing the total weighted delay and minimizing the weighted delay out of the area, and the two objecti...

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2012 Vol. 25, No. 2