西南交通大学学报

Cusp Point Condition for Estimating Ultimate Load of Pile Foundation Based on Strength Reduction Method

DONG Tianwen, ZHENG Yingren, TANG Xiaosong

2014, 27(3): 373-378. doi: 10.3969/j.issn.0258-2724.2014.03.001

[Abstract](1000)

Abstract:
In order to estimate the ultimate load of pile foundation by the strength reduction method, based on the Zeeman machine of cusp catastrophe, the bearing capacity functional of pile foundation and the theory of direct shear test the catastrophe's critical condition of bearing capacity of pile foundat...

Bearing Behaviour of Composite Foundation with Rigid-Flexible and Long-Short Piles under Embankment Load

ZUO Shen, LIU Weizheng, ZHANG Ruikun, ZHANG Hao, ZHANG Junhui

2014, 27(3): 379-385. doi: 10.3969/j.issn.0258-2724.2014.03.002

[Abstract](1405)

Abstract:
In order to study the bearing characteristics of the composite foundation with rigid-flexible and long-short piles under embankment loading, a field test of a foundation improved by the capped pre-stressed thin-wall concrete (PTC) piles and soil cement deep mixed (CDM) columns was conducted in a bri...

Structural Internal Force of Shield Tunnel in Expansive Soil Underlying Sandy Pebble Layer

FANG Yong, HE Chuan, QI Chun, ZHANG Ming

2014, 27(3): 386-392. doi: 10.3969/j.issn.0258-2724.2014.03.003

[Abstract](957)

Abstract:
The Chengdu metro line 2 partly passes through the complex strata of sandy pebble and expansive soil. In order to obtain the influence law of expansive force resulted from partial expansion on shield tunnel lining structure load in complex layers, the influence of partial expansion with various rang...

Soil-Water and Shear Strength Characteristics of Unsaturated Red Clay

LI Longqi, LUO Shuxue, JIANG Hong, SONG Lei, DING Bingbing, LI Chugen

2014, 27(3): 393-398,431. doi: 10.3969/j.issn.0258-2724.2014.03.004

[Abstract](1130)

Abstract:
In order to study the unsaturated characteristics of red clay, Geo-experts self-balanced pressure plate meter and ZJ direct shear apparatus were used in experiments to investigate the soil-water and shear strength characteristics of the typical undisturbed and remolded red clays under different dry ...

Dynamic Responses of Groundwater Seepage of Landslide Influenced by Fluctuation of Reservoir Water Level

XIA Min, REN Guangming, MA Xinlei, DONG Qingzhi, HUANG Bangzhi, SUN Renxian

2014, 27(3): 399-405. doi: 10.3969/j.issn.0258-2724.2014.03.005

[Abstract](965)

Abstract:
In order to investigate the impact of reservoir water level fluctuation on the dynamic responses of groundwater seepage of landslide. The transient seepage of Shiliushubao landslide as a research object was discussed under five different water level fluctuation rates and different seepage coefficien...

Analysis of Dynamic Characteristics of Railway Subgrade Based on Three-Dimensional Numerical Simulation

KONG Xianghui, JIANG Guanlu, LI Anhong, XIAO Dong

2014, 27(3): 406-411. doi: 10.3969/j.issn.0258-2724.2014.03.006

[Abstract](1367)

Abstract:
To discuss the effect of train axle load and speed on the dynamic characteristics of soil subgrade, a 3D dynamic simulation of the ballast track-subgrade system was made using ANSYS and FLAC3D. In the calculation process, the hysteretic damping was used to simulate the nonlinear characteristics of s...

Model Experiment of Fatigue Deformation Characteristic of Emergency Soil Airfield Pavement

LIU Junzhong, WENG Xingzhong, ZHANG Jun, LI Xianpeng, JI Dongming, GUO Lei

2014, 27(3): 412-418. doi: 10.3969/j.issn.0258-2724.2014.03.007

[Abstract](931)

Abstract:
To investigate the reasonable pavement structure for rapid construction of emergency airfield, fatigue deformation characteristics of soil airfield pavement were researched respectively by manual loading method and electro-hydraulic servo fatigue testing machine. Through a full-scale model test, the...

Dynamic Responses of Super-Long-Span Suspension Bridge with CFRP Cables under Different Structural Design Parameters

LI Cuijuan, XU Xun, QIANG Shizhong

2014, 27(3): 419-424. doi: 10.3969/j.issn.0258-2724.2014.03.008

[Abstract](1072)

Abstract:
In order to research the dynamic responses of a super-long span suspension bridge with CFRP cables, a super-long-span suspension bridge with CFRP (carbon-fibre reinforced plastic) cables and having a span of 3 500 m was designed by taking a strait as engineering background. Based on the ANSYS softwa...

Effects of Axial Force Fluctuations on Seismic Behavior of Steel Box Column

LI Haifeng, LUO Yongfeng, CHEN Lincong, MEI Zhen

2014, 27(3): 425-431. doi: 10.3969/j.issn.0258-2724.2014.03.009

[Abstract](804)

Abstract:
To investigate the influence mechanism of axial force fluctuation on the seismic behaviors of steel box columns, the seismic behaviors of steel box columns under 5 patterns of eccentrically fluctuant axial force were numerically analyzed by finite element simulation. The influence rules of axial for...

Influence of Seam in Type Ⅰ Slab Ends on Dynamic Characteristics of Track and Vehicle

YANG Junbin, LIU Xueyi, LIU Yongxiao, DAI Feng

2014, 27(3): 432-437,512. doi: 10.3969/j.issn.0258-2724.2014.03.010

[Abstract](996)

Abstract:
In order to study the influence of the seam between type Ⅰ slab ends and CA mortar on dynamic characteristics of rail, slab, and vehicle under high-speed train load, a vehicle-type Ⅰ slab track vertical coupling dynamic model was established. Through this model, the changes of evaluation indexes suc...

Vibration Response of Vehicle with Stochastic Structural Parameters under Random Excitation

JIA Aiqin, CHEN Jianjun, CAO Hongjun

2014, 27(3): 438-443. doi: 10.3969/j.issn.0258-2724.2014.03.011

[Abstract](964)

Abstract:
To investigate the influence of random structure parameters on vehicle vibration responses, the random vibration responses of a vehicle system with uncertain parameters under random road excitations were investigated using a quarter-vehicle model. A dynamic model for the system was established. In t...

Actions of Derailed Train on Structures in Eurocode：Impact Mechanism and Design Strategy

LIU Yanhui, ZHAO Shichun, Manfred Keuser

2014, 27(3): 444-449. doi: 10.3969/j.issn.0258-2724.2014.03.012

[Abstract](1101)

Abstract:
In order to study the impact mechanism and design method for a derailed train impacting against adjacent structures that are applicable to Chinese high-speed train, the UK Railway Group Standards GC/RT5112 and International Union of Railways leaflet UIC777-2R are analyzed, which are the basis to dev...

DC Bus Capacitor Voltage Balancing Circuits in Diode-Clamped Multilevel Converter

DING Na, SHU Zeliang

2014, 27(3): 450-454. doi: 10.3969/j.issn.0258-2724.2014.03.013

[Abstract](779)

Abstract:
In order to solve the imbalance of DC bus capacitor voltages in the diode-clamped multilevel converter, a balancing circuit with two-layer auxiliary inductors was designed. With this circuit, the voltages of all the DC-side capacitors in the multilevel converter can be balanced by a simple control. ...

Variable Width Pulse Train Controlled DCM Buck Converter

WU Songrong, ZHONG Shu, XU Jianping, SHA Jin

2014, 27(3): 455-461. doi: 10.3969/j.issn.0258-2724.2014.03.014

[Abstract](790)

Abstract:
In order to solve the problem that DC-DC converter switch has a large steady-state output voltage ripple in pulse train (PT) control, a variable width pulse train (VWPT) control method was proposed after analysis of the generating mechanism of large output voltage ripples. The VWPT control method is...

Optimization Design of Mathematical Morphology Filter Based on Quantum Genetic Algorithm

ZHANG Xiaochen, GAO Hongli, HUANG Haifeng, GUO Liang, XIAO Shide

2014, 27(3): 462-469. doi: 10.3969/j.issn.0258-2724.2014.03.015

[Abstract](1508)

Abstract:
To deal with the structuring element optimization of mathematical morphology filter, an optimization design method of mathematical morphology filter based on quantum genetic algorithm was proposed. The quantum genetic population was initialized according to the characteristic of mathematical morphol...

Dynamic Behaviors Analysis of a Class of Complex-Valued Neural Networks with Mixed Time Delays

XU Xiaohui, ZHANG Jiye, ZHAO Ling

2014, 27(3): 470-476. doi: 10.3969/j.issn.0258-2724.2014.03.016

[Abstract](1105)

Abstract:
To apply the complex-valued neural networks to pattern recognition, the dynamical behaviors of the equilibrium point of a class of complex-valued networks with mixed time delays were investigated. Assuming that the activation functions satisfy the global Lipschitz condition, some sufficient conditio...

Real-Time Object Tracking Based on Hough Ferns

QUAN Wei, CHEN Jinxiong, JIANG Yongquan, YU Nanyang

2014, 27(3): 477-484. doi: 10.3969/j.issn.0258-2724.2014.03.017

[Abstract](824)

Abstract:
In order to deal with the tough problem of providing high accuracy and meanwhile achieving real-time tracking using Hough-based approaches under very limited samples for training, a Hough ferns based method was proposed for object tracking. This method uses the random ferns as the basic detector. It...

Barrier-Free Design of Passenger Trains in China

XIANG Zerui, XU Bochu, ZHI Jinyi, DONG Shiyu, GUO Xiaofeng, ZHANG Yong

2014, 27(3): 485-493. doi: 10.3969/j.issn.0258-2724.2014.03.018

[Abstract](1405)

Abstract:
To find out the solution for barrier-free design of passenger trains in China, three models were proposed by analyzing the passengers' special needs, including the demand model of passenger with reduced mobility, the accessible passageway model of coach, and the basic layout model of wheelchair acce...

Stability Research for Parallel Operation of Diesel Generator Sets

LI Donghui, ZHANG Jundong, JI Yulong

2014, 27(3): 494-498. doi: 10.3969/j.issn.0258-2724.2014.03.019

[Abstract](1163)

Abstract:
In order to analyze quantitatively the stability of parallel operation of diesel generator sets and monitor the state of generators being out of step during development of a simulator for the ship power system, calculation formulae for parameters of the swing angle were deduced. An on-line algorithm...

Scheme for Optimal Energy-Efficient and Resource Allocation in OFDM-Based DF Relay Link

HUANG Gaoyong, FANG Xuming, HUANG Bo, CHEN Yu

2014, 27(3): 499-506. doi: 10.3969/j.issn.0258-2724.2014.03.020

[Abstract](824)

Abstract:
The resource allocation problem in OFDM-based DF-Relayed link was formulated as a joint optimization of subcarrier pairing and power allocation while maximizing energy efficiency (EE) with both the minimum rate and the total transmission power constraints. It is proved that the optimal energy-effici...

Reliability Model for Failure Dependence Direction of Mechanical Components

LIANG Hongqin, TANG Jiayin, HE Ping, WANG Jianpeng

2014, 27(3): 507-512. doi: 10.3969/j.issn.0258-2724.2014.03.021

[Abstract](935)

Abstract:
In order to determine the dependence direction of correlated failures in the reliability calculation of mechanical structural systems, a reliability variable determination model was established under a linear regression background according to properties of the linear dependent coefficient. Using th...

Corrosion Rate Test of Cable Wires of Large Span Bridge

MIAO Changqing, WEI Tinghua, WANG Yichun, WANG Man

2014, 27(3): 513-518. doi: 10.3969/j.issn.0258-2724.2014.03.022

[Abstract](1049)

Abstract:
In order to explore the corrosion law of large span bridge cables, cylindrical corrosion electrodes were prepared according to the actual corrosion state of bridge cable wires, and the electrochemical corrosion rate of the high strength-steel wires were investigated by orthogonal experiment design a...

Verification of Stent Mechanical Formulas by “Planar Stent” Experiment

YANG Jie, YANG Ji, XU Jiang, LIU Yujie, HUANG Nan

2014, 27(3): 519-524. doi: 10.3969/j.issn.0258-2724.2014.03.023

[Abstract](781)

Abstract:
To verify the formulas of elastic radial stiffness and plastic limit pressure of stents, the conception of "planar stent cell" was proposed and a planar stent specimen was produced according to the real curved structure of an intravascular stent. Tensile experiments of "planar stent cell" were then ...

Chaos Control of Lauwerier Mapping

GUO Feng, XIE Jianhua, YUE Yuan

2014, 27(3): 525-529. doi: 10.3969/j.issn.0258-2724.2014.03.024

[Abstract](777)

Abstract:
In order to overcome the defect that the properties of the original system is changed in the process of chaos control with external excitation or damping, the OGY control method is combined with the pole placement technique of the linear control theory to establish a linear mapping. By applying the ...

Accelerated Fatigue Test in Vitro of the New Mechanical Heart Valve

WU Liangliang, ZHOU Feng, SUN Hong, WANG Jin, LIU Li, HUANG Nan

2014, 27(3): 530-535. doi: 10.3969/j.issn.0258-2724.2014.03.025

[Abstract](876)

Abstract:
In order to evaluate the opening and closing states and fatigue properties of a new type of polyoxymethylene heart valve, accelerated fatigue tests were performed on the polyoxymethylene heart valve and an ON-X heart valve using the heart valve prostheses fatigue tester (TH-2200). The opening and th...

Field Measurement of Automobiles’ Lateral Accelerations

XU Jin, YANG Kui, LUO Qing, SHAO Yiming

2014, 27(3): 536-545. doi: 10.3969/j.issn.0258-2724.2014.03.026

[Abstract](1054)

Abstract:
To provide design basis for alignment parameters of different types of highways, the lateral accelerations, speeds, and trajectory curvature radii of passenger cars and buses on 12 highways having different design speed and topography were collected in field survey. The level of driving comfort on e...

Identification of Prevalent Air Traffic Flow in Terminal Airspace Based on Trajectory Spectral Clustering

WANG Chao, HAN Bangcun, WANG Fei

2014, 27(3): 546-552. doi: 10.3969/j.issn.0258-2724.2014.03.027

[Abstract](1190)

Abstract:
In order to improve the adaptability of terminal airspace and standard arrival/departure routes to real air traffic flows and their spatial distribution, a method for detection of main air traffic flows in massive flight trajectories was addressed. After analysis of the spatial characteristics of tr...

4D Trajectory Prediction Based on BADA and Aircraft Intent

ZHANG Junfeng, JIANG Haihang, WU Xiaoguang, TANG Xinming

2014, 27(3): 553-558. doi: 10.3969/j.issn.0258-2724.2014.03.028

[Abstract](1261)

Abstract:
In order to improve the trajectory prediction accuracy, a new four-dimensional aircraft trajectory prediction approach was presented, which was based on aircraft performance data and aircraft intent. Firstly, through statistical analysis of historical radar data about aircraft trajectories, an aircr...

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2014 Vol. 27, No. 3