西南交通大学学报

Rain-Wind-Induced Vibration of Cables in Cable-Stayed Bridges (Ⅰ): Mechanism Analysis

LI Yong-Le, XU Yao-Lin, CHEN Ji-Min, CHEN Bo

2011, 24(4): 529-535. doi: 10.3969/j.issn.0258-2724.2011.04.001

[Abstract](2203)

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Abstract:
In order to explore the mechanism of rain-wind-induced vibration of cables, a modified model for rain-wind-induced vibration of cables was proposed based on aerodynamic coefficients tested by a spatial model with three-dimensional ambient flows. Furthermore, the feasibility of the modified model was...

Stochastic Responses of Train-Bridge Coupling System for Simply-Supported High-Speed Railway Bridge

ZHU Yan, LI Xiao-Zhen, QIANG Shi-Zhong

2011, 24(4): 535-540. doi: 10.3969/j.issn.0258-2724.2011.04.002

[Abstract](2103)

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In order to analyze the stochastic responses of a train-bridge coupling system in high-speed railway, the pseudo-excitation method (PEM) was applied to transform a vertical track profile irregularity into the superposition of harmonic excitations at a series of frequency points to translate a non-st...

Effective Stiffness Method for Calculation of Deflection of Composite Beams

ZHOU Dong-Hua, SUN Li-Li, FAN Jiang, ZHAO Zhi-Man, LIU Yong-Fang

2011, 24(4): 541-546. doi: 10.3969/j.issn.0258-2724.2011.04.003

[Abstract](1752)

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Accurate calculation of deflection of composite beams with elastic shear connections is difficult because of difficultly getting an analytical solution under an arbitrary load, and analytical solutions in common load cases are quite complicated. For these reasons, a simplified calculation method cal...

Experimental Investigation on Load-Slip Relationship of Perfobond Rib Shear Connectors

WANG Zhen-Hai, ZHAO Can-Hui, LI Qiao

2011, 24(4): 547-552. doi: 10.3969/j.issn.0258-2724.2011.04.004

[Abstract](1273)

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In order to investigate the structural behavior of perfobond rib shear connectors in the whole load-bearing process, 37 specimens of perfobond rib shear connectors, sorted into 11 groups, were tested in the failure test under static loading. The load-slip curve in each working region and failure mod...

Experimental Research of Anchored System for Longitudinal Connected Ballastless Track in High-Speed Railway

WEI Qiang, ZHAO Guo-Tang, GAO Yong-Jie, CAO Xiao-Pei, FU Qi-Zhang

2011, 24(4): 553-558. doi: 10.3969/j.issn.0258-2724.2011.04.005

[Abstract](1839)

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In order to get the rational relationship of interaction between bridge and rail, an anchored system for longitudinal connected ballastless track was designed, and a field experiment was carried out. The regularities of changes in the stress and displacement of the anchored system and distribution o...

Model Test of Water Content Control of Saturated Over-Wet Soil

HU Qi-Jun, WEN Hua, GONG Cheng, WANG Tian-Heng

2011, 24(4): 558-563. doi: 10.3969/j.issn.0258-2724.2011.04.006

[Abstract](1493)

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In order to probe into the approaches and effects of reducing the water content in saturated over-wet soils in moist and rainy areas, the water drainage effects of the vacuum preloading method and electro-osmosis method were compared via indoor model tests. The result indicates that the both methods...

Prototype Test on Failure Characteristics of Segmental Lining Structure for Nanjing Yangtze River Tunnel

FENG Kun, HE Chuan, SU Zong-Xian

2011, 24(4): 564-571. doi: 10.3969/j.issn.0258-2724.2011.04.007

[Abstract](1520)

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In order to research the failure characteristics of segmental lining structure for Nanjing Yangtze River tunnel, a prototype test was carried out by using a “multi-function shield tunnel structure test system”. Water pressure and earth pressure were applied separately upon the prototype segmental li...

Robust Controller of Self-Powered Active Suspension

SONG Peng-Yun, ZHANG Ke-Yue, ZHANG Ji-Ye

2011, 24(4): 572-578. doi: 10.3969/j.issn.0258-2724.2011.04.008

[Abstract](1306)

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In order to improve the stability, vibration isolation and energy feedback performance of self-powered active suspension systems with parameter uncertainty for vehicles, a robust controller was designed for the system model with perturbation, and the energy equilibrium condition was given. The contr...

Calculation and Optimization of Train Headway in CBTC System

CHEN Rong-Wu, CHU Chang-Han, LIU Li

2011, 24(4): 579-585. doi: 10.3969/j.issn.0258-2724.2011.04.009

[Abstract](1523)

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In order to solve the problem that system performances are impacted by increased train headway in the station area in an urban rail transit system, the existing algorithms for train headway in a CBTC (communication based train control) system were analyzed, and a headway optimization method was prop...

Improved Electromagnetic Rail Launcher

JIANG Qi-Long, FU Lei

2011, 24(4): 586-591. doi: 10.3969/j.issn.0258-2724.2011.04.010

[Abstract](1449)

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To simplify the system configuration and improve the utilization of energy, the distributed-energy-storage rail launcher and the segmented rail launcher were analyzed and compared based on the basic principle of rail launcher. An improved electromagnetic rail launcher was proposed and simulation ana...

Startup Capability of Boost DC/DC Converter

XIANG Gan-Yin, FENG Quan-Yuan

2011, 24(4): 591-597. doi: 10.3969/j.issn.0258-2724.2011.04.011

[Abstract](1072)

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An analytical model was proposed to calculate the minimum startup voltage of a boost DC/DC converter under a constant current load. The factors, such as the current load, the parasitic parameters, the saturation current and on-resistance of the power switch, the switching frequency, and the minimum ...

CoarseSignalProcessingforACPowerSmartSensor

CHE Chang, HU Dan

2011, 24(4): 598-603. doi: 10.3969/j.issn.0258-2724.2011.04.012

[Abstract](1161)

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In order to improve the testing precision and real-time performance of the AC electrical power performance index, the coarse signal processing approach of AC power intelligent sensor was studied based on the theory of correlation analysis method and the least-squares method. The least-squares charac...

New Estimation Method for Harmonic and Inter-Harmonic Parameters

LIU Ya-Mei, YANG Hong-Geng, MA Chao

2011, 24(4): 604-610. doi: 10.3969/j.issn.0258-2724.2011.04.013

[Abstract](1058)

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In order to analyze the effect of noise signals on the estimation of harmonic and inter-harmonic parameters, a new method was proposed on the basis of the essential property of noise information and the several useful strategies including the modern cross-spectrum, total least square, ESPRIT (estima...

ANFIS-Based Fault Classification Approach for UHV Transmission Lines

LIN Sheng, HE Zheng-You, CHEN Shuang, QIAN Qing-Quan

2011, 24(4): 611-619. doi: 10.3969/j.issn.0258-2724.2011.04.014

[Abstract](1208)

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A novel fault type classification approach for ultra-high voltage (UHV) transmission lines was proposed based on the adaptive-network-based fuzzy inference system (ANFIS) to distinguish the ten common fault types, including single line to ground faults, line to line to ground faults, line to line fa...

Directional Reconstruction of Super Resolution Image by Magnifying Curvelet Basis

HAN Zhi-Wei, LIU Zhi-Gang, ZHAO Fei

2011, 24(4): 620-625. doi: 10.3969/j.issn.0258-2724.2011.04.015

[Abstract](1080)

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A super-resolution image reconstruction algorithm was proposed using the 2nd generation curvelet to reduce the edge blur caused by traditional algorithms. In the proposed algorithm, the original image is decomposed into j scales using curvelet. The curvelet coefficients in the j scales of the zoomed...

Adaptive Technology for Vehicles Tracking Based on Intelligent Agent

QU Ju-Bao

2011, 24(4): 626-632. doi: 10.3969/j.issn.0258-2724.2011.04.016

[Abstract](1267)

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To study the problem of detecting and tracking fast-moving vehicles in complex circumstances, an adaptive algorithm for image segmentation and filtering was proposed using intelligent Agent based on knowledge database, and an adaptive background model was built through the dynamic matrix of accumula...

Mixed Distribution Model of Vehicle Headway

TAO Peng-Fei, WANG Dian-Hai, JIN Cheng

2011, 24(4): 633-638. doi: 10.3969/j.issn.0258-2724.2011.04.017

[Abstract](1177)

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For describing the distribution characteristics of headway, driving behaviors are classified into car-following state and free driving state by reference to the two-fluid theory. After analysis of their operation features, a mixed distribution model that can describe the headway distribution of both...

Estimation Models for Average Speed of Traffic Flow Based on GPS Data of Taxi

JIANG Gui-Yan, CHANG An-De, LI Qi, YI Feng

2011, 24(4): 638-644. doi: 10.3969/j.issn.0258-2724.2011.04.018

[Abstract](1314)

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The existing average speed estimation models based on GPS (global positioning system) data of taxis are not applicable where high precision and low cost are of necessities. Two traditional models, namely a time integral model and a time interpolation model, based on the GPS data of taxis were modifi...

Efficient Route Plan Algorithm Based on Multi-level Road Network Strategy

ZHONG Hui-Ling, ZHANG Meng, SHI Yong-Jiang, CAI Wen-Hua

2011, 24(4): 645-650. doi: 10.3969/j.issn.0258-2724.2011.04.019

[Abstract](1282)

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In order to overcome the shortcoming of route plan algorithms' inefficiency caused by an oversized road network, a new route plan algorithm, hierarchy A* algorithm, was proposed. The hierarchy A* algorithm is characterized by the multi-level road network decomposition pre-processing, the goal-direct...

Simulation of Landscape Impact on Driving Safety on Road Bends in Mountain Area

YANG Zhi-Fa, SONG Yu-Lin, GUAN Xin, LI Shi-Wu

2011, 24(4): 651-656. doi: 10.3969/j.issn.0258-2724.2011.04.020

[Abstract](1490)

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A simulation process was built to address the impact of landscapes on driving safety on road bends in mountain area. In the simulation, the judgment method of transverse slide accidents of vehicles, the generation method of obstacles or other vehicles within the front view of a driver, the calculati...

Conditional Bus Signal Priority Strategies Considering Saturation Degree Restriction at Isolated Junction

BIE Yi-Ming, WANG Dian-Hai, SONG Xian-Min, GENG Yan

2011, 24(4): 657-661. doi: 10.3969/j.issn.0258-2724.2011.04.021

[Abstract](1119)

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To reduce the negative effect on general traffic caused by bus signal priority (BSP), a conditional priority methodology that considers the saturation degree restriction in the premise that no traffic congestion occurs at the intersection was brought forward, and two bus signal priority strategies, ...

Avoidance Strategy for Head-on Conflict on Taxiway Based on Supervisory Control Theory of DES

ZHU Xinping, TANG Xinmin, HAN Songchen

2011, 24(4): 664-670. doi: 10.3969/j.issn.0258-2724.2011.04.022

[Abstract](1273)

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A closed loop control approach was proposed to overcome the shortcomings of open loop control that can not tackle stochastic events in airport surface operations. A control strategy for head-on conflict on taxiway in an airport equipped with an A-SMGCS (advanced surface movement guidance and control...

Spray Characteristics of High-Pressure Mist Nozzle of Lubrication Device for Space Mechanisms

SHENG Mingwei, CHEN Weishan, LIU Junkao

2011, 24(4): 671-675. doi: 10.3969/j.issn.0258-2724.2011.04.023

[Abstract](996)

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To solve the lubricating failure of spacecrafts in orbit for lack of lubrication, a high-pressure mist nozzle was applied to the spatial lubrication field. A gas-liquid two-phase flow model for direct mist nozzles was established, and the mist flow generating process was simulated using the software...

High-Accuracy Cooperative Positioning Algorithm in Multipath Environment

LIU Lin, FAN Pingzhi

2011, 24(4): 676-680. doi: 10.3969/j.issn.0258-2724.2011.04.024

[Abstract](1138)

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In order to protect location estimates from NLOS (non-line-of-sight) error influence, a high-accuracy cooperative positioning algorithm was proposed. In this algorithm the cooperative information between MSs (mobile stations) is used to enhance the location accuracy, and the relationship between mea...

New Fusion Estimation Algorithm for Systematic Errors of Multiple Dissimilar Sensors

SONG Qiang, HE You, XIONG Wei

2011, 24(4): 681-687. doi: 10.3969/j.issn.0258-2724.2011.04.025

[Abstract](1391)

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In order to solve the problem of systematic error estimation in a multiple dissimilar sensor network composed of passive sensors with DOA (direction of arrival) and TOA (time of arrival) measurements and active sensors, a new fusion estimation algorithm for systematic errors was proposed. With this ...

Multi-objective Optimization of Cross-Docking Logistics System under Stochastic Demand

HU Lu, PENG Bo, JIANG Yangsheng, ZHANG Gai

2011, 24(4): 688-694. doi: 10.3969/j.issn.0258-2724.2011.04.026

[Abstract](1469)

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In order to enhance the adaptivity of cross-docking logistics (CDL) to stochastic market demand, a multi-objective stochastic programming model was established. Taking both local and global interests into account and considering the factors such as random demand, inventory, distribution, and origina...

Experimental Study on Safe Driving Based on Electroencephalography

OU Jushang

2011, 24(4): 695-700. doi: 10.3969/j.issn.0258-2724.2011.04.027

[Abstract](1197)

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In order to study the effects of alcohol drinking on electroencephalography (EEG) during driving, a system of indicators for EEG analysis were set up based on the real-time EEG data of drivers collected by a neuroscan EEG system under virtual scenes made of sharp curves, emergency stop belts, obstac...

Application of Remote Sensing to Land Cover Change Induced by Nargis Hurricane in Myanmar

CHEN Xiao-Yong, LIU Bo, AungKyawTUN

2011, 24(4): 701-705. doi: 10.3969/j.issn.0258-2724.2011.04.028

[Abstract](1222)

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In order to investigate the effects of the Nargis hurricane on the Ayeyarwady Delta in Myanmar, the ISODATA (iterative self-organizing data analysis techniques algorithm) unsupervised classification method and the Bayesian maximum-likelihood supervised-classification method were used to classify the...

Screening Functional Strains and Constructing Complex Microbial System for Accelerating Stabilization of Landfill

QIU Zhong-Peng, LIU Yuan-Yue, WANG Qian, TANG Jian, TONG Fei, ZHOU Li-Ping

2011, 24(4): 706-711. doi: 10.3969/j.issn.0258-2724.2011.04.029

[Abstract](1199)

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For accelerating the stabilization of landfill, functional strains were screened and sub-cultured repeatedly with traditional microbiological methods in surroundings. Then the screened strains were grouped and coded from I# to VII# based on the different functions of the strains. The compound flora ...

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2011 Vol. 24, No. 4