西南交通大学学报

Damage Analysis of Subgrade Engineering in Wenchuan Earthquake and Recommendations for Improving Seismic Design Code

YAO Lingkan, FENG Junde, YANG Ming

2009, 22(3): 301-311.

[Abstract](1879)

Abstract:
It is important and imperative to improve the current seismic design codes of railway and highway by applying the near-field data in the Wenchuan earthquake. Through a recent survey in the near-fault area,especially Dujiangyan to Yingxiu section of state route No.213,a third-grade highway built in 2...

Analyses of River-Blocking and Breaking Mode of "9·24" Debris Flow near Tangjiashan Barrier Dam

HU Xiewen, LÜ, Xiaoping, HUANG Runqiu, REN Xiaoming, WANG Xuerui, LIU Juan

2009, 22(3): 312-320,326.

[Abstract](1702)

Abstract:
"5·12" Wenchuan earthquake caused a high-speed landslide on the Tangjiashan mountain to block the Tongkou river to form the Tangjiashan dammed lake. After a normal discharge on June 10,2008,there were potential hazards of stability loss of remnant Tangjashan mountain body and debris flows in Dashui ...

Discussions on Two Key Technical Problems for Seismic Design of Retaining Structures

ZHANG Jianjing, FENG Jun, XIAO Shiguo, LIU Changqing

2009, 22(3): 321-326.

[Abstract](2049)

Abstract:
Detailed investigation was carried out on the failure mode of retaining structures caused by the Wenchuan earthquake along highways and railways summing up to 3 000 km in length in Sichuan. From the investigation results,two key technical problems,performance-based design method of retaining structu...

Preliminary Research on Seismic Capacity Reserve for Ductile and Brittle Structures

ZHAO Shichun, LIU Yanhui, KOU Ju’an, MU Chaozhi

2009, 22(3): 327-335.

[Abstract](1584)

Abstract:
According to the present researches,the seismic capacity reserve (SCR) for ductile structures is divided into three levels,i.e.,basic SCR,overall SCR and unexpected SCR,while the SCR for brittle ones is just embodied in one level,the basic SCR. Frame structures and brick masonry structures were sele...

Lessons Learnt from Damage of Highway Tunnels in Wenchuan Earthquake

GAO Bo, WANG Zhengzheng, YUAN Song, SHEN Yusheng

2009, 22(3): 336-341,374.

[Abstract](1988)

Abstract:
Based on the field investigation of 18 tunnels along Dujiangyan-Wenchuan highway,the damage patterns of highway tunnels were systematically described,the damage mechanisms were analyzed,and some proposals were put forward for the future rehabilitation of the tunnels damaged by the Wenchuan earthquak...

Rigidity Characteristics of Multi-span Suspension Bridges

ZHENG Kaifeng, LI Huaiguang, XU Rundong

2009, 22(3): 342-346.

[Abstract](1807)

Abstract:
To probe into the effect of change in structural parameters,the gravity stiffness method was extended and used to investigate the characteristics of vertical deformation of multi-span suspension bridges. Deflection expressions for multi-span suspension bridges were derived by considering the bending...

Implementation of Space Voltage PWM Method and Neutral-Point Voltage Control for Single-Phase Three-Level Rectifiers

FENG Xiaoyun, SONG Wensheng

2009, 22(3): 347-353.

[Abstract](2466)

Abstract:
An improved SVPWM (space voltage pulse width modulation) method and a novel neutral-point voltage control method were proposed by analyzing the operating principle of single-phase three-level NPC (neutral-point-clamped) voltage-source rectifiers and the disadvantages of the conventional single-phase...

Comparison of Dynamic Performances of Several Pantograph/Catenary Systems for High-Speed Railway

CHEN Weirong, LI Wenhao, ZHANG Qian, THOMAS Reichmann

2009, 22(3): 354-359.

[Abstract](2214)

Abstract:
In order to investigate the interaction between high-speed pantographs and catenaries,two catenary systems without stitch wire and two systems with stitch wire along with the DSA250 and DSA380 high-speed pantographs were chosen at different speed grades. The FEA (finite element analysis) method was ...

Real Time PLL-less Detection Method for Single-Phase Random Harmonic Current

ZHOU Fulin, LI Qunzhan, GUO Cheng

2009, 22(3): 360-364.

[Abstract](1570)

Abstract:
A real time PLL-less detection method for single phase random harmonic current was proposed. In the method,harmonic current is transformed to low frequency signals by a transform matrix instead of a phase lock loop (PLL) used in traditional harmonic current detection method,and the low frequency sig...

Reliability of Relay Valve of Brake System for Rail Vehicles

WU Mengling, WANG Xiaoyan, TIAN Chun

2009, 22(3): 365-369.

[Abstract](2142)

Abstract:
The reliability of relay valves of brake system for rail vehicles was investigated by endurance test. The results show that the failures of the relay valve can be described as a Weibull distribution with a shape parameter of 3.43,and the failure rate increases with an increase in test cycles,and fat...

Influences of Fluid and Structural Parameters on Flow-Induced Vibrations of Plate-Fluid Structure

LU Li, YANG Yiren

2009, 22(3): 370-374.

[Abstract](1698)

Abstract:
The equations for fluid forces acting on a flat beam in a rigid water trough with axial flow were derived using the analytical equations for fluid dynamic pressure of typical plate-fluid-plate model. The natural frequencies of a hinged 4-span flat beam in air and in axial viscous fluid flow were cal...

αth-Order Inverse Control Based on Online Least Square Support Vector Machines

LIU Luzhou, XIAO Jian, WANG Song

2009, 22(3): 375-379.

[Abstract](1716)

Abstract:
An αth-order inverse control method based on online least square support vector machines (LS-SVM) algorithm was proposed. An insensitive function of control system error was introduced. The controller constructed off-line is retrained online with the incremental and decremental algorithm when the co...

Energy-Based Dynamical Servo Control for Brachiation of Underactuated 2-Link Robot

ZHAO Yini, CHENG Hongtai, ZHANG Xiaohua

2009, 22(3): 380-384.

[Abstract](1748)

Abstract:
A dynamical servo control strategy was proposed to control the terminal of an underactuated 2-link robot to track a given trajectory or an object during its brachiation. The single pendulum like brachiation of primates was simulated,the control rules for a sliding mode control based on energy and th...

Adjustment Method for Train Break-up and Make-up Sequence in Railway Technical Station

PENG Qiyuan, ZHAO Jun

2009, 22(3): 385-391.

[Abstract](1386)

Abstract:
Based on a comprehensive analysis of the break-up and make-up practices,the capacity limit of the shunting locomotives and the relationship between the arrival and departure wagons in a railway technical station,an adjustment method for train break-up and make-up sequence was proposed. When the time...

Application of Goal Programming in Railway Heavy Haul Transportation

WANG Ciguang

2009, 22(3): 392-395.

[Abstract](2698)

Abstract:
Goal programming was applied to obtain the heavy haul train operation plan. Four grades of priority are defined in the goal programming model according to the practices of heavy haul transportation in China railways. The 1st priority prescribes the prescriptive transportation volume index,and the 2n...

Approach for Variable Precision Rough Set Based on Preference Relation with Incomplete Information

LIU Dun, HU Pei, LI Tianrui

2009, 22(3): 396-401.

[Abstract](1437)

Abstract:
A variable precision rough set model based on preference relation with incomplete information was proposed using Ziarko’s variable precision rough set model and Greco’s expanded rough set model. The new model was to overcome the subjectivity and weakness of traditional decision-making method in deal...

Multi-objection Optimization for Collaborative Scheduling Aircraft Landing on Multi-runways

ZHANG Honghai, HU Minghua

2009, 22(3): 402-409.

[Abstract](1981)

Abstract:
To make a safe,fair and efficient tactical decision in ATC (air traffic control),the collaborative aircraft scheduling (CAS) problem was studied,in which the factors concerning ATC,airlines and airports were considered. A collaborative airline scheduling strategy and a multi-objection optimization m...

Dynamic Sector Plan Based on Variable Precision Rough Set Theory

ZHANG Ming, HAN Songchen

2009, 22(3): 410-414.

[Abstract](1711)

Abstract:
To precisely estimate sector number and improve the flexibility of sector plans,a dynamic sector plan method based on variable precision rough set theory was proposed. In the method,the rules for a sector plan of different flight numbers are derived from the existing flight data and based on the var...

Traffic Congestion Management Method Based on Case-Based Reasoning

JI Xiaofeng, LIU Lan

2009, 22(3): 415-420.

[Abstract](1701)

Abstract:
A traffic congestion management method was proposed using case-based reasoning (CBR) technique. For new congestion management problems,the proposed method searches the similar cases and related solutions in the case library. The methods of case representation,case retrieval and case revise were pres...

Evolutionary Game Analysis of Supervision on Retrieval of Scrapped Automobile

DAI Ying, WANG Xu, XING Lebin

2009, 22(3): 421-425.

[Abstract](1657)

Abstract:
The evolutionary game model between the government and the retrieving enterprises was derived to analyze the stability conditions of the both parties and to reveal their behaviors and the effects on their stability. The factors directly affecting the game result are the cost and benefits of the retr...

Evaluation of Node Importance in Complex Networks

CHEN Jing, SUN Linfu

2009, 22(3): 426-429.

[Abstract](2204)

Abstract:
To improve the efficiency and validity of node importance evaluating,a new evaluation method for node importance in complex networks was proposed based on node closeness and node key degree in its neighborhood. In this method,the global importance and the local importance of nodes are combined. The ...

Overview of Content-Based Adaptive Audio Watermarking

WANG Hongxia

2009, 22(3): 430-436,447.

[Abstract](2100)

Abstract:
The digital audio watermarking techniques were summarized regarding the time domain and the transform domain. To the second generation watermarking technique,the content-based audio watermarking,adaptive audio watermarking and synchronization technique were emphasized,and their merits and defects we...

Information Sharing Strategies for Particle Swarm Optimization Algorithm

LIN Chuan, FENG Quanyuan

2009, 22(3): 437-441.

[Abstract](1781)

Abstract:
To find out a more efficient information sharing strategy,the information sharing mechanism and the role of the equilibrium point in particle swarm optimization (PSO) algorithms were analyzed. Based on the analysis,four kinds of PSO algorithms using different information sharing strategies were pres...

Speech Emotion Recognition under Noise Background

ZHANG Shiqing, ZHAO Zhijin

2009, 22(3): 442-447.

[Abstract](1674)

Abstract:
To efficiently implement emotion recognition in noise speech signals,a new method of speech emotion recognition based on FLSSVM (fuzzy least squares support vector machines) was proposed. With this method,the prosody and voice quality features are extracted from emotional speech,and then FLSSVM is u...

Secret Image Sharing Based on Self-adaptive Multi-pixel Encoding

ZHANG Haibo, WANG Xiaofei, HUANG Youpeng, LUO Wei

2009, 22(3): 448-454.

[Abstract](1523)

Abstract:
To improve the encoding efficiency of the current visual secret sharing schemes,a novel encoding algorithm,self-adaptive multi-pixel encoding (SME),was proposed. SME scans a secret image row by row or column by column till meeting a different type pixel or reaching the end,and then fills the encrypt...

Experimental Investigation on Energy Conservation Performance of Finned-Tube Refrigeration Heat Exchanger with Circular Holes

WANG Houhua, FANG Zhaosong, ZHENG Shuangying

2009, 22(3): 455-460.

[Abstract](1696)

Abstract:
To probe into the refrigeration performance of hole finned-tube under frosting,a wind-tunnel experiment research on the energy conservation performance was carried out when air flows over a single-row-plane finned-tube refrigeration exchanger under a frosting condition. The experimental results show...

Performances of Micro-electrolysis for Decomposing Organic Pollutions in Stabilized Landfill Leachate

QIU Zhongping, HAN Shuxin, LIU Yuanyue, GONG Zhengjun, HAN Yunping

2009, 22(3): 461-465.

[Abstract](1597)

Abstract:
A micro-electrolysis procedure for decomposing organic pollutions in stabilized landfill leachate pretreatment was optimized,and performances of the procedure were investigated. The results showed that the optimal pH was 4.0,the volume fraction of cast iron scraps to that of granular active carbon w...

Quantum Effects in Mesoscopic RLC Circuit under Eigenstate of Ladder Operator

CUI Yuanshun, ZHOU Huailing

2009, 22(3): 466-472.

[Abstract](1481)

Abstract:
To investigate the factors influencing quantum fluctuations,the quantum fluctuations of charge,current and energy in a mesoscopic RLC circuit were calculated in a new Fock space defined by the charge operator using the character of the minimum shift operator based on charge quantization. The results...

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2009 Vol. 22, No. 3