西南交通大学学报

Effect of Distributions of Static Suspension Deflection on Ride Comfort of High-Speed Passenger Cars

LIU Pengfei, WANG Kaiyun, ZHAI Wanming

2013, 26(2): 193-198. doi: 10.3969/j.issn.0258-2724.2013.02.001

[Abstract](1188)

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Abstract:
In order to improve the ride comfort of high-speed passenger cars, a study was made on the static deflection of suspension system, and the relationship between the total static deflection and the static deflection ratio of the secondary to primary suspension was discussed. According to the vibration...

A Novel Fatigue Analysis Method of Welded Frames

XIAO Shoune, YANG Chao, YANG Guangwu

2013, 26(2): 199-204. doi: 10.3969/j.issn.0258-2724.2013.02.002

[Abstract](1130)

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Abstract:
In order to evaluate the fatigue strength of welded bogie frames under multi-axial stress in load cases, a tensor method based on the direct method and projection method was proposed by applying coordinate transformation property of the second-order tensor. This method, by transforming multi-axial s...

Lifting Dynamic Characteristics of Crane with Frequency Control

PU Hanjun, XIE Xiaopeng, LIANG Guangchi

2013, 26(2): 205-210. doi: 10.3969/j.issn.0258-2724.2013.02.003

[Abstract](1260)

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Abstract:
For purpose of calculating the lifting dynamic load in a crane accurately, a generalized precise direct integration method was proposed to analyze dynamic characteristics of the load-lifting system of the crane. Using this method, the dynamic responses of the system during the load-lifting process o...

Experimental Investigations of Three-Dimensional Flow Field around the Head of Gas-Liquid Slug Flow in Microchannels

WANG Ling, LUO Rui, WANG Buxuan

2013, 26(2): 223-229. doi: 10.3969/j.issn.0258-2724.2013.02.006

[Abstract](894)

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The three-dimensional micro-particle image velocimetry (PIV) technique was used for experimentally studying three-dimensional flow field properties of slug flow in microchannels. By processing images of slug flow, three-dimensional fluorescent particles distribution and velocity flow field of the li...

Temperature Field of Catenary for Electrified Railway during Online Anti-icing

GUO Lei, LI Qunzhan, XIE Shaofeng, SHU Zeliang

2013, 26(2): 230-235,242. doi: 10.3969/j.issn.0258-2724.2013.02.007

[Abstract](1332)

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Abstract:
Accidents of icing on catenary have great impacts on normal operation of electrical railway. In order to guarantee traction power supply, an online anti-icing technology for catenary was proposed based on the static var generator (SVG). Heat balance equations for catenary were built, and solved resu...

High-Efficiency Power Distribution Scheme for Online Powered System of Electric Vehicles

SUN Yue, TIAN Yong, SU Yugang, WANG Zhihui

2013, 26(2): 236-242. doi: 10.3969/j.issn.0258-2724.2013.02.008

[Abstract](1043)

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In order to reduce the serious transmission loss in the online powered system for electric vehicles, a power distribution scheme based on high-voltage transfer and low-voltage stimulation was proposed. In this scheme, a high-voltage track is used to reduce the transmission loss, and a low-voltage tr...

Influence of Frequency of Impulsive Square Wave Voltage on Partial Discharge Characteristics and Its Mechanism

WANG Peng, WU Guangning, LUO Yang, ZHANG Yiqiang, XU Huihui

2013, 26(2): 243-249,270. doi: 10.3969/j.issn.0258-2724.2013.02.009

[Abstract](996)

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Abstract:
To probe into the influence of frequency of (impulsive) square wave voltage on partial discharge (PD) characteristics, a system for PD detection specially used at square wave voltage was designed by resorting to the ultra-high frequency (UHF) detection method and the IEEE 488.2 protocol. By utilizin...

Method of Identifying Volterra Frequency-Domain Kernels Based on Stimulus of Multi-tone Signal

HAN Haitao, MA Hongguang, YU Ningyu, ZHANG Jialiang

2013, 26(2): 250-256. doi: 10.3969/j.issn.0258-2724.2013.02.010

[Abstract](1074)

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In order to solve the problem of difficultly identifying Volterra frequency-domain kernels, the output properties of Volterra frequency-domain kernels stimulated by multi-tone signal were investigated, and a novel non-parametric method to identify Volterra frequency-domain kernels was proposed based...

Universal Data Organization Method of LED Display Screen Based on Multi-scanning-beam

JIN Wei, ZHU Yunfang, WU Zhiquan, LI Qi

2013, 26(2): 257-263. doi: 10.3969/j.issn.0258-2724.2013.02. 011

[Abstract](702)

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Abstract:
In order to overcome the shortcoming of the current data organization methods with a lack of the versatility for different unit circuit boards, by analyzing the existing unit circuit boards of LED display screens a universal data organization method of LED display screens was proposed based on multi...

3 GHz Thermoacoustic Tomography System

HUANG Lin, LIU Lixin, LU Kui, ZHONG Xiaochun, LI Tingting, CHEN Bingzhang, RONG Jian, JIANG Huabei

2013, 26(2): 264-270. doi: 10.3969/j.issn.0258-2724.2013.02.012

[Abstract](931)

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To evaluate the performance of a 3 GHz thermoacoustic tomography (TAT) system, absorbers with different shapes and contrasts were investigated using the circular scanning method, the imaging depth was probed into by adding porcine fat to the top of an absorber. Tissue-mimicking phantom experiment re...

Empirical Mathematical Model for Nonlinear Motion-Induced Aerodynamic Force of Bridge Girder

WANG Qi, LIAO Haili, LI Mingshui, MA Cunming

2013, 26(2): 271-277. doi: 10.3969/j.issn.0258-2724.2013.02.013

[Abstract](1241)

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In order to probe into the nonlinear motion-induced aerodynamic force (MIAF) of bridge girder, based on Taylor expansion of the equilibrium position, a nonlinear MIAF mathematical model for bridge girder under harmonic motions was established, and the plural and real expressions were deduced. The id...

Pier Linear Stiffness Optimization of Large-Span Simply-Supported Beam Bridge for Continually Welded Rail

QIAO Jiandong, LI Zhihui, YANG Qing

2013, 26(2): 278-282. doi: 10.3969/j.issn.0258-2724.2013.02.014

[Abstract](1445)

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Abstract:
In order to obtain the key factor of the overall design of a large-span high-pier long-league bridge, the reasonable value of pier longitudinal stiffness was discussed. Based on stress transfer mechanism of continually welded rail on bridge, a rail-beam-pier-foundation integration model was establis...

Destructive Field Test on Properties of Uplift and Compression Piles

MA Jie, ZHAO Jian, ZHAO Yanlin

2013, 26(2): 283-289,296. doi: 10.3969/j.issn.0258-2724.2013.02.015

[Abstract](1077)

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To clarify the similarities and differences of properties of uplift and compression piles, the mobilizations of skin friction and tip resistance were analyzed based on destructive filed tests on two uplift piles and two compression piles. The destructive field test results showed that under a destru...

Theoretical Analysis and Experimental Investigation on Cross-Legged Silent Rail

ZHAO Caiyou, WANG Ping

2013, 26(2): 290-296. doi: 10.3969/j.issn.0258-2724.2013.02.016

[Abstract](1218)

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In order to reduce wheel-rail noises, a cross-legged silent rail was designed. Unlike the traditional silent rail, an extension layer is added between rail and the damping layer, moreover, the extension layer and the constraining layer are interlaced mutually. The structure was optimized using the f...

Length Determination of Track Concrete Plate for Unit Double-Block Ballastless Track

WEI Youxin, QIN Chaohong, LI Chenghui, YANG Bin

2013, 26(2): 297-302,309. doi: 10.3969/j.issn.0258-2724.2013.02.017

[Abstract](1152)

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In order to determine the rational length of unit track concrete plate, the numerical simulation method was applied to analyze the stress and strain responses of unit double-block ballastless track with different lengths under train load, transversal and longitudinal loads, temperature force and tem...

Influence of Weak Layer Properties on Deformation of Embankment over Sloped Weak Ground

LIU Jinnan, JIANG Xin, QIU Yanjun

2013, 26(2): 303-309. doi: 10.3969/j.issn.0258-2724.2013.02.018

[Abstract](1020)

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In order to get the deformation characteristics of embankment over sloped weak ground with different weak layer properties, a numerical model was established based on the nonlinear finite element method. The orthogonal design was applied to evaluate the significances of influencing factors. The rese...

Engineering Geological Division of Geological Hazards along Dali-Ruili Railway in Gaoligong Mountain Section

ZHAO Zhiming, WU Guang, KOU Chuan

2013, 26(2): 310-316. doi: 10.3969/j.issn.0258-2724.2013.02.019

[Abstract](1153)

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Abstract:
The Gaoligong Mountain section of Dali-Ruili railway line is characterized by complicated topography and terrain, diverse rock and soil mass, and frequently active faults. In order to evaluate the impact of geological hazards such as rock falls, landslides, and debris flows on the railway project in...

Kalman Filter Algorithm for Medium-Range Real-Time Kinematic Positioning with One Reference Station

XU Yantian, CHENG Pengfei, CAI Yanhui

2013, 26(2): 317-322,356. doi: 10.3969/j.issn.0258-2724.2013.02.020

[Abstract](917)

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In order to achieve real-time kinematic (RTK) accurate positioning for medium-range baselines and weaken the effects of double-difference tropospheric delay and ionospheric delay between stations and satellites, dry tropospheric delay was computed with the Hopfield model, while double-difference tro...

Compatibility of Polycarboxylate Superplasticizer with Cements of Different Freshness

ZHAO Jumei, LI Maohong, DENG Siyuan, YU Hongquan, LI Yun, QUAN Ming

2013, 26(2): 323-327. doi: 10.3969/j.issn.0258-2724.2013.02.021

[Abstract](1051)

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Abstract:
In order to study the factors influencing the compatibility of polycarboxylate superplasticizer with cements, cement paste fluidity methods were used to evaluate the compatibility between the superplasticizer and cements with different freshness at different temperatures and moistures. The Zeta pote...

Influence of Vehicle Length and Velocity on Mixed Traffic Flow in Two-Lane Traffic Flow

PAN Weijun, YANG Kai

2013, 26(2): 335-342. doi: 10.3969/j.issn.0258-2724.2013.02.023

[Abstract](1444)

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Abstract:
In order to study the influence of large vehicles' lane-changing and sensitive driving behaviors on the highway traffic flow, a two-lane mixed traffic cellular automate (CA) model was built by introducing the lane-changing rule into the sensitive driving Nash (SDNS) model, on the assumption that the...

Travel Time Estimation Method Using SCATS Traffic Data Based on k-NN Algorithm

JIANG Guiyan, LI Qi, DONG Shuo

2013, 26(2): 343-349. doi: 10.3969/j.issn.0258-2724.2013.02.024

[Abstract](1164)

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A new method was designed to improve the effect of travel time estimation using SCATS traffic data. In this method, by analyzing the characteristics of SCATS traffic data that their acquisition intervals are not strictly consistent, the virtual time series of SCATS traffic data was constructed first...

Video-Based Vehicle Tracking and Capturing System for Expressway Tollgates

XIA Chuangwen, XU Jianmin, LU Yijie, WANG Qionghua

2013, 26(2): 350-356. doi: 10.3969/j.issn.0258-2724.2013.02.025

[Abstract](1022)

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In order to reduce the noise impacts in front of the camera and improve the vehicle capturing precision in expressway tollgate scenes, an efficient and flexible judgment framework for vehicle capture was proposed. Specifically, through the analyses of the common motion detection methods, an improved...

Signal Coordination Algorithm Considering Vehicle Platoon Movement Characteristics on Arterial Streets

BIE Yiming, LI Yishun, WANG Linhong, WANG Dianhai, SONG Xianmin

2013, 26(2): 357-367. doi: 10.3969/j.issn.0258-2724.2013.02.026

[Abstract](1104)

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To develop a signal coordination algorithm and determine its application conditions, a new prediction model of vehicle arrival pattern of intersection coordinated phase was brought forward, which is based on Robertson's dispersion model and take into account three contributing factors such as platoo...

Modeling the Dynamic Impacts of Multi-modal Guidance Information on Commuters' Trip Chain

ZHAO Dan, SHAO Chunfu, YUE Hao

2013, 26(2): 368-375. doi: 10.3969/j.issn.0258-2724.2013.02.027

[Abstract](1087)

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To study commuters' dynamic choice behavior under the multi-modal guidance information, based on utility theory and multi-stage decision method, a dynamic model was proposed to describe the choice behavior of the daily trip chain that starts and ends at home with the objective of maximizing the perc...

Travel Time Reliability during Incident Duration Time

CHEN Lingjuan, LIU Haixu, PU Yun

2013, 26(2): 376-382. doi: 10.3969/j.issn.0258-2724.2013.02.028

[Abstract](1239)

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In order to describe the stochasticity in road network performance under the influence of an incident, the travel time reliability of the road network was defined as the probability that the mean travel time during incident is smaller than a prespecified threshold. The incident duration was assumed ...

Bionics Design of Transverse Stiffener in the Upright Rail Box Girder Based on Bamboo Strucure

FU Weigang, CHENG Wenming, YU Lanfeng, PU Dezhang

2013, 26(2): 211-216. doi: 10.3969/j.issn.0258-2724.2013.02.004

[Abstract](1390)

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In order to find a lightweight solution for the box girders of cranes, taking bamboo as the bionics objective, a structure optimization was made for the transverse stiffeners of the upright rail box girder. A study on the relationship between the nature distribution of bamboo structural parameters a...

Chaotic Motion of Two-Dimensional Viscoelastic Panel with External Excitation in Subsonic Flow

LI Peng, YANG Yiren, LU Li

2013, 26(2): 217-222. doi: 10.3969/j.issn.0258-2724.2013.02.005

[Abstract](1152)

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Abstract:
In order to study the nonlinear dynamics of a panel subjected to external excitation in subsonic flow, the nonlinear governing motion equations of a two-dimensional forced subsonic viscoelastic panel were established by Hamilton theory, and discretized to a series of ordinary differential equations ...

Post-Disaster Safety Analysis of Construction Site of Scenic Region

FU Fei, DONG Liang, ZHANG Jian, WANG Gang

2013, 26(2): 328-334. doi: 10.3969/j.issn.0258-2724.2013.02.022

[Abstract](1223)

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A 3D virtual model for high gradient zones and flow path regions was built by quantitative analysis methods of the digital elevation model, to guide the safety monitoring and ecological restoration of a regional environment after disaster. Using the virtual model, the site environment in the geologi...

Collision Risk Model around Intersection of Airways

HAN Songchen, QU Yuling, SUN Fanrong, ZHU Xinping

2013, 26(2): 383-389. doi: 10.3969/j.issn.0258-2724.2013.02.029

[Abstract](1117)

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Abstract:
In order to estimate the collision risk caused by variable nominal separation when two aircraft on intersecting airways are flying around the intersection, a collision risk model around the airway intersection was proposed by introducing a variable of arrival time interval. A method was given to est...

Trajectory Optimization Method for Spacecraft Orbit Transfer with Finite Thrust

WANG Changhong, QU Yaobin, LU Zhijun, AN Hao, XIA Hongwei, MA Guangcheng

2013, 26(2): 390-394. doi: 10.3969/j.issn.0258-2724.2013.02.030

[Abstract](1472)

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Abstract:
In order to achieve the rapid maneuver and effective fuel saving of the spacecraft with finite thrust in flight, trajectory planning based on psedospectral method was studied. Orbit transfer was modeled mathematically with Gauss dynamics equations by using improved equatorial orbital elements. The m...

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2013 Vol. 26, No. 2